drivers/net/usb/hso.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Driver for Option High Speed Mobile Devices.
   5  *
   6  *  Copyright (C) 2008 Option International
   7  *                     Filip Aben <f.aben@option.com>
   8  *                     Denis Joseph Barrow <d.barow@option.com>
   9  *                     Jan Dumon <j.dumon@option.com>
  10  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
  11  *                      <ajb@spheresystems.co.uk>
  12  *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
  13  *  Copyright (C) 2008 Novell, Inc.
  14  *
  15  *****************************************************************************/
  16
  17 /******************************************************************************
  18  *
  19  * Description of the device:
  20  *
  21  * Interface 0: Contains the IP network interface on the bulk end points.
  22  *              The multiplexed serial ports are using the interrupt and
  23  *              control endpoints.
  24  *              Interrupt contains a bitmap telling which multiplexed
  25  *              serialport needs servicing.
  26  *
  27  * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
  28  *              port is opened, as this have a huge impact on the network port
  29  *              throughput.
  30  *
  31  * Interface 2: Standard modem interface - circuit switched interface, this
  32  *              can be used to make a standard ppp connection however it
  33  *              should not be used in conjunction with the IP network interface
  34  *              enabled for USB performance reasons i.e. if using this set
  35  *              ideally disable_net=1.
  36  *
  37  *****************************************************************************/
  38
  39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  40
  41 #include <linux/sched/signal.h>
  42 #include <linux/slab.h>
  43 #include <linux/init.h>
  44 #include <linux/delay.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/module.h>
  47 #include <linux/ethtool.h>
  48 #include <linux/usb.h>
  49 #include <linux/tty.h>
  50 #include <linux/tty_driver.h>
  51 #include <linux/tty_flip.h>
  52 #include <linux/kmod.h>
  53 #include <linux/rfkill.h>
  54 #include <linux/ip.h>
  55 #include <linux/uaccess.h>
  56 #include <linux/usb/cdc.h>
  57 #include <net/arp.h>
  58 #include <asm/byteorder.h>
  59 #include <linux/serial_core.h>
  60 #include <linux/serial.h>
  61
  62
  63 #define MOD_AUTHOR                      "Option Wireless"
  64 #define MOD_DESCRIPTION                 "USB High Speed Option driver"
  65
  66 #define HSO_MAX_NET_DEVICES             10
  67 #define HSO__MAX_MTU                    2048
  68 #define DEFAULT_MTU                     1500
  69 #define DEFAULT_MRU                     1500
  70
  71 #define CTRL_URB_RX_SIZE                1024
  72 #define CTRL_URB_TX_SIZE                64
  73
  74 #define BULK_URB_RX_SIZE                4096
  75 #define BULK_URB_TX_SIZE                8192
  76
  77 #define MUX_BULK_RX_BUF_SIZE            HSO__MAX_MTU
  78 #define MUX_BULK_TX_BUF_SIZE            HSO__MAX_MTU
  79 #define MUX_BULK_RX_BUF_COUNT           4
  80 #define USB_TYPE_OPTION_VENDOR          0x20
  81
  82 /* These definitions are used with the struct hso_net flags element */
  83 /* - use *_bit operations on it. (bit indices not values.) */
  84 #define HSO_NET_RUNNING                 0
  85
  86 #define HSO_NET_TX_TIMEOUT              (HZ*10)
  87
  88 #define HSO_SERIAL_MAGIC                0x48534f31
  89
  90 /* Number of ttys to handle */
  91 #define HSO_SERIAL_TTY_MINORS           256
  92
  93 #define MAX_RX_URBS                     2
  94
  95 /*****************************************************************************/
  96 /* Debugging functions                                                       */
  97 /*****************************************************************************/
  98 #define hso_dbg(lvl, fmt, ...)                                          \
  99 do {                                                                    \
 100         if ((lvl) & debug)                                              \
 101                 pr_info("[%d:%s] " fmt,                                 \
 102                         __LINE__, __func__, ##__VA_ARGS__);             \
 103 } while (0)
 104
 105 /*****************************************************************************/
 106 /* Enumerators                                                               */
 107 /*****************************************************************************/
 108 enum pkt_parse_state {
 109         WAIT_IP,
 110         WAIT_DATA,
 111         WAIT_SYNC
 112 };
 113
 114 /*****************************************************************************/
 115 /* Structs                                                                   */
 116 /*****************************************************************************/
 117
 118 struct hso_shared_int {
 119         struct usb_endpoint_descriptor *intr_endp;
 120         void *shared_intr_buf;
 121         struct urb *shared_intr_urb;
 122         struct usb_device *usb;
 123         int use_count;
 124         int ref_count;
 125         struct mutex shared_int_lock;
 126 };
 127
 128 struct hso_net {
 129         struct hso_device *parent;
 130         struct net_device *net;
 131         struct rfkill *rfkill;
 132         char name[24];
 133
 134         struct usb_endpoint_descriptor *in_endp;
 135         struct usb_endpoint_descriptor *out_endp;
 136
 137         struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
 138         struct urb *mux_bulk_tx_urb;
 139         void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
 140         void *mux_bulk_tx_buf;
 141
 142         struct sk_buff *skb_rx_buf;
 143         struct sk_buff *skb_tx_buf;
 144
 145         enum pkt_parse_state rx_parse_state;
 146         spinlock_t net_lock;
 147
 148         unsigned short rx_buf_size;
 149         unsigned short rx_buf_missing;
 150         struct iphdr rx_ip_hdr;
 151
 152         unsigned long flags;
 153 };
 154
 155 enum rx_ctrl_state{
 156         RX_IDLE,
 157         RX_SENT,
 158         RX_PENDING
 159 };
 160
 161 #define BM_REQUEST_TYPE (0xa1)
 162 #define B_NOTIFICATION  (0x20)
 163 #define W_VALUE         (0x0)
 164 #define W_LENGTH        (0x2)
 165
 166 #define B_OVERRUN       (0x1<<6)
 167 #define B_PARITY        (0x1<<5)
 168 #define B_FRAMING       (0x1<<4)
 169 #define B_RING_SIGNAL   (0x1<<3)
 170 #define B_BREAK         (0x1<<2)
 171 #define B_TX_CARRIER    (0x1<<1)
 172 #define B_RX_CARRIER    (0x1<<0)
 173
 174 struct hso_serial_state_notification {
 175         u8 bmRequestType;
 176         u8 bNotification;
 177         u16 wValue;
 178         u16 wIndex;
 179         u16 wLength;
 180         u16 UART_state_bitmap;
 181 } __packed;
 182
 183 struct hso_tiocmget {
 184         struct mutex mutex;
 185         wait_queue_head_t waitq;
 186         int    intr_completed;
 187         struct usb_endpoint_descriptor *endp;
 188         struct urb *urb;
 189         struct hso_serial_state_notification *serial_state_notification;
 190         u16    prev_UART_state_bitmap;
 191         struct uart_icount icount;
 192 };
 193
 194
 195 struct hso_serial {
 196         struct hso_device *parent;
 197         int magic;
 198         u8 minor;
 199
 200         struct hso_shared_int *shared_int;
 201
 202         /* rx/tx urb could be either a bulk urb or a control urb depending
 203            on which serial port it is used on. */
 204         struct urb *rx_urb[MAX_RX_URBS];
 205         u8 num_rx_urbs;
 206         u8 *rx_data[MAX_RX_URBS];
 207         u16 rx_data_length;     /* should contain allocated length */
 208
 209         struct urb *tx_urb;
 210         u8 *tx_data;
 211         u8 *tx_buffer;
 212         u16 tx_data_length;     /* should contain allocated length */
 213         u16 tx_data_count;
 214         u16 tx_buffer_count;
 215         struct usb_ctrlrequest ctrl_req_tx;
 216         struct usb_ctrlrequest ctrl_req_rx;
 217
 218         struct usb_endpoint_descriptor *in_endp;
 219         struct usb_endpoint_descriptor *out_endp;
 220
 221         enum rx_ctrl_state rx_state;
 222         u8 rts_state;
 223         u8 dtr_state;
 224         unsigned tx_urb_used:1;
 225
 226         struct tty_port port;
 227         /* from usb_serial_port */
 228         spinlock_t serial_lock;
 229
 230         int (*write_data) (struct hso_serial *serial);
 231         struct hso_tiocmget  *tiocmget;
 232         /* Hacks required to get flow control
 233          * working on the serial receive buffers
 234          * so as not to drop characters on the floor.
 235          */
 236         int  curr_rx_urb_idx;
 237         u8   rx_urb_filled[MAX_RX_URBS];
 238         struct tasklet_struct unthrottle_tasklet;
 239 };
 240
 241 struct hso_device {
 242         union {
 243                 struct hso_serial *dev_serial;
 244                 struct hso_net *dev_net;
 245         } port_data;
 246
 247         u32 port_spec;
 248
 249         u8 is_active;
 250         u8 usb_gone;
 251         struct work_struct async_get_intf;
 252         struct work_struct async_put_intf;
 253
 254         struct usb_device *usb;
 255         struct usb_interface *interface;
 256
 257         struct device *dev;
 258         struct kref ref;
 259         struct mutex mutex;
 260 };
 261
 262 /* Type of interface */
 263 #define HSO_INTF_MASK           0xFF00
 264 #define HSO_INTF_MUX            0x0100
 265 #define HSO_INTF_BULK           0x0200
 266
 267 /* Type of port */
 268 #define HSO_PORT_MASK           0xFF
 269 #define HSO_PORT_NO_PORT        0x0
 270 #define HSO_PORT_CONTROL        0x1
 271 #define HSO_PORT_APP            0x2
 272 #define HSO_PORT_GPS            0x3
 273 #define HSO_PORT_PCSC           0x4
 274 #define HSO_PORT_APP2           0x5
 275 #define HSO_PORT_GPS_CONTROL    0x6
 276 #define HSO_PORT_MSD            0x7
 277 #define HSO_PORT_VOICE          0x8
 278 #define HSO_PORT_DIAG2          0x9
 279 #define HSO_PORT_DIAG           0x10
 280 #define HSO_PORT_MODEM          0x11
 281 #define HSO_PORT_NETWORK        0x12
 282
 283 /* Additional device info */
 284 #define HSO_INFO_MASK           0xFF000000
 285 #define HSO_INFO_CRC_BUG        0x01000000
 286
 287 /*****************************************************************************/
 288 /* Prototypes                                                                */
 289 /*****************************************************************************/
 290 /* Serial driver functions */
 291 static int hso_serial_tiocmset(struct tty_struct *tty,
 292                                unsigned int set, unsigned int clear);
 293 static void ctrl_callback(struct urb *urb);
 294 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
 295 static void hso_kick_transmit(struct hso_serial *serial);
 296 /* Helper functions */
 297 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
 298                                    struct usb_device *usb, gfp_t gfp);
 299 static void handle_usb_error(int status, const char *function,
 300                              struct hso_device *hso_dev);
 301 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
 302                                                   int type, int dir);
 303 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
 304 static void hso_free_interface(struct usb_interface *intf);
 305 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
 306 static int hso_stop_serial_device(struct hso_device *hso_dev);
 307 static int hso_start_net_device(struct hso_device *hso_dev);
 308 static void hso_free_shared_int(struct hso_shared_int *shared_int);
 309 static int hso_stop_net_device(struct hso_device *hso_dev);
 310 static void hso_serial_ref_free(struct kref *ref);
 311 static void hso_std_serial_read_bulk_callback(struct urb *urb);
 312 static int hso_mux_serial_read(struct hso_serial *serial);
 313 static void async_get_intf(struct work_struct *data);
 314 static void async_put_intf(struct work_struct *data);
 315 static int hso_put_activity(struct hso_device *hso_dev);
 316 static int hso_get_activity(struct hso_device *hso_dev);
 317 static void tiocmget_intr_callback(struct urb *urb);
 318 /*****************************************************************************/
 319 /* Helping functions                                                         */
 320 /*****************************************************************************/
 321
 322 /* #define DEBUG */
 323
 324 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
 325 {
 326         return hso_dev->port_data.dev_net;
 327 }
 328
 329 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
 330 {
 331         return hso_dev->port_data.dev_serial;
 332 }
 333
 334 /* Debugging functions */
 335 #ifdef DEBUG
 336 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
 337                      unsigned int len)
 338 {
 339         static char name[255];
 340
 341         sprintf(name, "hso[%d:%s]", line_count, func_name);
 342         print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
 343 }
 344
 345 #define DUMP(buf_, len_)        \
 346         dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
 347
 348 #define DUMP1(buf_, len_)                       \
 349         do {                                    \
 350                 if (0x01 & debug)               \
 351                         DUMP(buf_, len_);       \
 352         } while (0)
 353 #else
 354 #define DUMP(buf_, len_)
 355 #define DUMP1(buf_, len_)
 356 #endif
 357
 358 /* module parameters */
 359 static int debug;
 360 static int tty_major;
 361 static int disable_net;
 362
 363 /* driver info */
 364 static const char driver_name[] = "hso";
 365 static const char tty_filename[] = "ttyHS";
 366 static const char *version = __FILE__ ": " MOD_AUTHOR;
 367 /* the usb driver itself (registered in hso_init) */
 368 static struct usb_driver hso_driver;
 369 /* serial structures */
 370 static struct tty_driver *tty_drv;
 371 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
 372 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
 373 static DEFINE_SPINLOCK(serial_table_lock);
 374
 375 static const s32 default_port_spec[] = {
 376         HSO_INTF_MUX | HSO_PORT_NETWORK,
 377         HSO_INTF_BULK | HSO_PORT_DIAG,
 378         HSO_INTF_BULK | HSO_PORT_MODEM,
 379         0
 380 };
 381
 382 static const s32 icon321_port_spec[] = {
 383         HSO_INTF_MUX | HSO_PORT_NETWORK,
 384         HSO_INTF_BULK | HSO_PORT_DIAG2,
 385         HSO_INTF_BULK | HSO_PORT_MODEM,
 386         HSO_INTF_BULK | HSO_PORT_DIAG,
 387         0
 388 };
 389
 390 #define default_port_device(vendor, product)    \
 391         USB_DEVICE(vendor, product),    \
 392                 .driver_info = (kernel_ulong_t)default_port_spec
 393
 394 #define icon321_port_device(vendor, product)    \
 395         USB_DEVICE(vendor, product),    \
 396                 .driver_info = (kernel_ulong_t)icon321_port_spec
 397
 398 /* list of devices we support */
 399 static const struct usb_device_id hso_ids[] = {
 400         {default_port_device(0x0af0, 0x6711)},
 401         {default_port_device(0x0af0, 0x6731)},
 402         {default_port_device(0x0af0, 0x6751)},
 403         {default_port_device(0x0af0, 0x6771)},
 404         {default_port_device(0x0af0, 0x6791)},
 405         {default_port_device(0x0af0, 0x6811)},
 406         {default_port_device(0x0af0, 0x6911)},
 407         {default_port_device(0x0af0, 0x6951)},
 408         {default_port_device(0x0af0, 0x6971)},
 409         {default_port_device(0x0af0, 0x7011)},
 410         {default_port_device(0x0af0, 0x7031)},
 411         {default_port_device(0x0af0, 0x7051)},
 412         {default_port_device(0x0af0, 0x7071)},
 413         {default_port_device(0x0af0, 0x7111)},
 414         {default_port_device(0x0af0, 0x7211)},
 415         {default_port_device(0x0af0, 0x7251)},
 416         {default_port_device(0x0af0, 0x7271)},
 417         {default_port_device(0x0af0, 0x7311)},
 418         {default_port_device(0x0af0, 0xc031)},  /* Icon-Edge */
 419         {icon321_port_device(0x0af0, 0xd013)},  /* Module HSxPA */
 420         {icon321_port_device(0x0af0, 0xd031)},  /* Icon-321 */
 421         {icon321_port_device(0x0af0, 0xd033)},  /* Icon-322 */
 422         {USB_DEVICE(0x0af0, 0x7301)},           /* GE40x */
 423         {USB_DEVICE(0x0af0, 0x7361)},           /* GE40x */
 424         {USB_DEVICE(0x0af0, 0x7381)},           /* GE40x */
 425         {USB_DEVICE(0x0af0, 0x7401)},           /* GI 0401 */
 426         {USB_DEVICE(0x0af0, 0x7501)},           /* GTM 382 */
 427         {USB_DEVICE(0x0af0, 0x7601)},           /* GE40x */
 428         {USB_DEVICE(0x0af0, 0x7701)},
 429         {USB_DEVICE(0x0af0, 0x7706)},
 430         {USB_DEVICE(0x0af0, 0x7801)},
 431         {USB_DEVICE(0x0af0, 0x7901)},
 432         {USB_DEVICE(0x0af0, 0x7A01)},
 433         {USB_DEVICE(0x0af0, 0x7A05)},
 434         {USB_DEVICE(0x0af0, 0x8200)},
 435         {USB_DEVICE(0x0af0, 0x8201)},
 436         {USB_DEVICE(0x0af0, 0x8300)},
 437         {USB_DEVICE(0x0af0, 0x8302)},
 438         {USB_DEVICE(0x0af0, 0x8304)},
 439         {USB_DEVICE(0x0af0, 0x8400)},
 440         {USB_DEVICE(0x0af0, 0x8600)},
 441         {USB_DEVICE(0x0af0, 0x8800)},
 442         {USB_DEVICE(0x0af0, 0x8900)},
 443         {USB_DEVICE(0x0af0, 0x9000)},
 444         {USB_DEVICE(0x0af0, 0x9200)},           /* Option GTM671WFS */
 445         {USB_DEVICE(0x0af0, 0xd035)},
 446         {USB_DEVICE(0x0af0, 0xd055)},
 447         {USB_DEVICE(0x0af0, 0xd155)},
 448         {USB_DEVICE(0x0af0, 0xd255)},
 449         {USB_DEVICE(0x0af0, 0xd057)},
 450         {USB_DEVICE(0x0af0, 0xd157)},
 451         {USB_DEVICE(0x0af0, 0xd257)},
 452         {USB_DEVICE(0x0af0, 0xd357)},
 453         {USB_DEVICE(0x0af0, 0xd058)},
 454         {USB_DEVICE(0x0af0, 0xc100)},
 455         {}
 456 };
 457 MODULE_DEVICE_TABLE(usb, hso_ids);
 458
 459 /* Sysfs attribute */
 460 static ssize_t hso_sysfs_show_porttype(struct device *dev,
 461                                        struct device_attribute *attr,
 462                                        char *buf)
 463 {
 464         struct hso_device *hso_dev = dev_get_drvdata(dev);
 465         char *port_name;
 466
 467         if (!hso_dev)
 468                 return 0;
 469
 470         switch (hso_dev->port_spec & HSO_PORT_MASK) {
 471         case HSO_PORT_CONTROL:
 472                 port_name = "Control";
 473                 break;
 474         case HSO_PORT_APP:
 475                 port_name = "Application";
 476                 break;
 477         case HSO_PORT_APP2:
 478                 port_name = "Application2";
 479                 break;
 480         case HSO_PORT_GPS:
 481                 port_name = "GPS";
 482                 break;
 483         case HSO_PORT_GPS_CONTROL:
 484                 port_name = "GPS Control";
 485                 break;
 486         case HSO_PORT_PCSC:
 487                 port_name = "PCSC";
 488                 break;
 489         case HSO_PORT_DIAG:
 490                 port_name = "Diagnostic";
 491                 break;
 492         case HSO_PORT_DIAG2:
 493                 port_name = "Diagnostic2";
 494                 break;
 495         case HSO_PORT_MODEM:
 496                 port_name = "Modem";
 497                 break;
 498         case HSO_PORT_NETWORK:
 499                 port_name = "Network";
 500                 break;
 501         default:
 502                 port_name = "Unknown";
 503                 break;
 504         }
 505
 506         return sprintf(buf, "%s\n", port_name);
 507 }
 508 static DEVICE_ATTR(hsotype, 0444, hso_sysfs_show_porttype, NULL);
 509
 510 static struct attribute *hso_serial_dev_attrs[] = {
 511         &dev_attr_hsotype.attr,
 512         NULL
 513 };
 514
 515 ATTRIBUTE_GROUPS(hso_serial_dev);
 516
 517 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
 518 {
 519         int idx;
 520
 521         for (idx = 0; idx < serial->num_rx_urbs; idx++)
 522                 if (serial->rx_urb[idx] == urb)
 523                         return idx;
 524         dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
 525         return -1;
 526 }
 527
 528 /* converts mux value to a port spec value */
 529 static u32 hso_mux_to_port(int mux)
 530 {
 531         u32 result;
 532
 533         switch (mux) {
 534         case 0x1:
 535                 result = HSO_PORT_CONTROL;
 536                 break;
 537         case 0x2:
 538                 result = HSO_PORT_APP;
 539                 break;
 540         case 0x4:
 541                 result = HSO_PORT_PCSC;
 542                 break;
 543         case 0x8:
 544                 result = HSO_PORT_GPS;
 545                 break;
 546         case 0x10:
 547                 result = HSO_PORT_APP2;
 548                 break;
 549         default:
 550                 result = HSO_PORT_NO_PORT;
 551         }
 552         return result;
 553 }
 554
 555 /* converts port spec value to a mux value */
 556 static u32 hso_port_to_mux(int port)
 557 {
 558         u32 result;
 559
 560         switch (port & HSO_PORT_MASK) {
 561         case HSO_PORT_CONTROL:
 562                 result = 0x0;
 563                 break;
 564         case HSO_PORT_APP:
 565                 result = 0x1;
 566                 break;
 567         case HSO_PORT_PCSC:
 568                 result = 0x2;
 569                 break;
 570         case HSO_PORT_GPS:
 571                 result = 0x3;
 572                 break;
 573         case HSO_PORT_APP2:
 574                 result = 0x4;
 575                 break;
 576         default:
 577                 result = 0x0;
 578         }
 579         return result;
 580 }
 581
 582 static struct hso_serial *get_serial_by_shared_int_and_type(
 583                                         struct hso_shared_int *shared_int,
 584                                         int mux)
 585 {
 586         int i, port;
 587
 588         port = hso_mux_to_port(mux);
 589
 590         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
 591                 if (serial_table[i] &&
 592                     (dev2ser(serial_table[i])->shared_int == shared_int) &&
 593                     ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
 594                         return dev2ser(serial_table[i]);
 595                 }
 596         }
 597
 598         return NULL;
 599 }
 600
 601 static struct hso_serial *get_serial_by_index(unsigned index)
 602 {
 603         struct hso_serial *serial = NULL;
 604         unsigned long flags;
 605
 606         spin_lock_irqsave(&serial_table_lock, flags);
 607         if (serial_table[index])
 608                 serial = dev2ser(serial_table[index]);
 609         spin_unlock_irqrestore(&serial_table_lock, flags);
 610
 611         return serial;
 612 }
 613
 614 static int get_free_serial_index(void)
 615 {
 616         int index;
 617         unsigned long flags;
 618
 619         spin_lock_irqsave(&serial_table_lock, flags);
 620         for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
 621                 if (serial_table[index] == NULL) {
 622                         spin_unlock_irqrestore(&serial_table_lock, flags);
 623                         return index;
 624                 }
 625         }
 626         spin_unlock_irqrestore(&serial_table_lock, flags);
 627
 628         pr_err("%s: no free serial devices in table\n", __func__);
 629         return -1;
 630 }
 631
 632 static void set_serial_by_index(unsigned index, struct hso_serial *serial)
 633 {
 634         unsigned long flags;
 635
 636         spin_lock_irqsave(&serial_table_lock, flags);
 637         if (serial)
 638                 serial_table[index] = serial->parent;
 639         else
 640                 serial_table[index] = NULL;
 641         spin_unlock_irqrestore(&serial_table_lock, flags);
 642 }
 643
 644 static void handle_usb_error(int status, const char *function,
 645                              struct hso_device *hso_dev)
 646 {
 647         char *explanation;
 648
 649         switch (status) {
 650         case -ENODEV:
 651                 explanation = "no device";
 652                 break;
 653         case -ENOENT:
 654                 explanation = "endpoint not enabled";
 655                 break;
 656         case -EPIPE:
 657                 explanation = "endpoint stalled";
 658                 break;
 659         case -ENOSPC:
 660                 explanation = "not enough bandwidth";
 661                 break;
 662         case -ESHUTDOWN:
 663                 explanation = "device disabled";
 664                 break;
 665         case -EHOSTUNREACH:
 666                 explanation = "device suspended";
 667                 break;
 668         case -EINVAL:
 669         case -EAGAIN:
 670         case -EFBIG:
 671         case -EMSGSIZE:
 672                 explanation = "internal error";
 673                 break;
 674         case -EILSEQ:
 675         case -EPROTO:
 676         case -ETIME:
 677         case -ETIMEDOUT:
 678                 explanation = "protocol error";
 679                 if (hso_dev)
 680                         usb_queue_reset_device(hso_dev->interface);
 681                 break;
 682         default:
 683                 explanation = "unknown status";
 684                 break;
 685         }
 686
 687         /* log a meaningful explanation of an USB status */
 688         hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
 689                 function, explanation, status);
 690 }
 691
 692 /* Network interface functions */
 693
 694 /* called when net interface is brought up by ifconfig */
 695 static int hso_net_open(struct net_device *net)
 696 {
 697         struct hso_net *odev = netdev_priv(net);
 698         unsigned long flags = 0;
 699
 700         if (!odev) {
 701                 dev_err(&net->dev, "No net device !\n");
 702                 return -ENODEV;
 703         }
 704
 705         odev->skb_tx_buf = NULL;
 706
 707         /* setup environment */
 708         spin_lock_irqsave(&odev->net_lock, flags);
 709         odev->rx_parse_state = WAIT_IP;
 710         odev->rx_buf_size = 0;
 711         odev->rx_buf_missing = sizeof(struct iphdr);
 712         spin_unlock_irqrestore(&odev->net_lock, flags);
 713
 714         /* We are up and running. */
 715         set_bit(HSO_NET_RUNNING, &odev->flags);
 716         hso_start_net_device(odev->parent);
 717
 718         /* Tell the kernel we are ready to start receiving from it */
 719         netif_start_queue(net);
 720
 721         return 0;
 722 }
 723
 724 /* called when interface is brought down by ifconfig */
 725 static int hso_net_close(struct net_device *net)
 726 {
 727         struct hso_net *odev = netdev_priv(net);
 728
 729         /* we don't need the queue anymore */
 730         netif_stop_queue(net);
 731         /* no longer running */
 732         clear_bit(HSO_NET_RUNNING, &odev->flags);
 733
 734         hso_stop_net_device(odev->parent);
 735
 736         /* done */
 737         return 0;
 738 }
 739
 740 /* USB tells is xmit done, we should start the netqueue again */
 741 static void write_bulk_callback(struct urb *urb)
 742 {
 743         struct hso_net *odev = urb->context;
 744         int status = urb->status;
 745
 746         /* Sanity check */
 747         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 748                 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
 749                 return;
 750         }
 751
 752         /* Do we still have a valid kernel network device? */
 753         if (!netif_device_present(odev->net)) {
 754                 dev_err(&urb->dev->dev, "%s: net device not present\n",
 755                         __func__);
 756                 return;
 757         }
 758
 759         /* log status, but don't act on it, we don't need to resubmit anything
 760          * anyhow */
 761         if (status)
 762                 handle_usb_error(status, __func__, odev->parent);
 763
 764         hso_put_activity(odev->parent);
 765
 766         /* Tell the network interface we are ready for another frame */
 767         netif_wake_queue(odev->net);
 768 }
 769
 770 /* called by kernel when we need to transmit a packet */
 771 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
 772                                             struct net_device *net)
 773 {
 774         struct hso_net *odev = netdev_priv(net);
 775         int result;
 776
 777         /* Tell the kernel, "No more frames 'til we are done with this one." */
 778         netif_stop_queue(net);
 779         if (hso_get_activity(odev->parent) == -EAGAIN) {
 780                 odev->skb_tx_buf = skb;
 781                 return NETDEV_TX_OK;
 782         }
 783
 784         /* log if asked */
 785         DUMP1(skb->data, skb->len);
 786         /* Copy it from kernel memory to OUR memory */
 787         memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
 788         hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
 789
 790         /* Fill in the URB for shipping it out. */
 791         usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
 792                           odev->parent->usb,
 793                           usb_sndbulkpipe(odev->parent->usb,
 794                                           odev->out_endp->
 795                                           bEndpointAddress & 0x7F),
 796                           odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
 797                           odev);
 798
 799         /* Deal with the Zero Length packet problem, I hope */
 800         odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
 801
 802         /* Send the URB on its merry way. */
 803         result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
 804         if (result) {
 805                 dev_warn(&odev->parent->interface->dev,
 806                         "failed mux_bulk_tx_urb %d\n", result);
 807                 net->stats.tx_errors++;
 808                 netif_start_queue(net);
 809         } else {
 810                 net->stats.tx_packets++;
 811                 net->stats.tx_bytes += skb->len;
 812         }
 813         dev_kfree_skb(skb);
 814         /* we're done */
 815         return NETDEV_TX_OK;
 816 }
 817
 818 static const struct ethtool_ops ops = {
 819         .get_link = ethtool_op_get_link
 820 };
 821
 822 /* called when a packet did not ack after watchdogtimeout */
 823 static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
 824 {
 825         struct hso_net *odev = netdev_priv(net);
 826
 827         if (!odev)
 828                 return;
 829
 830         /* Tell syslog we are hosed. */
 831         dev_warn(&net->dev, "Tx timed out.\n");
 832
 833         /* Tear the waiting frame off the list */
 834         if (odev->mux_bulk_tx_urb)
 835                 usb_unlink_urb(odev->mux_bulk_tx_urb);
 836
 837         /* Update statistics */
 838         net->stats.tx_errors++;
 839 }
 840
 841 /* make a real packet from the received USB buffer */
 842 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
 843                         unsigned int count, unsigned char is_eop)
 844 {
 845         unsigned short temp_bytes;
 846         unsigned short buffer_offset = 0;
 847         unsigned short frame_len;
 848
 849         /* log if needed */
 850         hso_dbg(0x1, "Rx %d bytes\n", count);
 851         DUMP(ip_pkt, min(128, (int)count));
 852
 853         while (count) {
 854                 switch (odev->rx_parse_state) {
 855                 case WAIT_IP:
 856                         /* waiting for IP header. */
 857                         /* wanted bytes - size of ip header */
 858                         temp_bytes =
 859                             (count <
 860                              odev->rx_buf_missing) ? count : odev->
 861                             rx_buf_missing;
 862
 863                         memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
 864                                odev->rx_buf_size, ip_pkt + buffer_offset,
 865                                temp_bytes);
 866
 867                         odev->rx_buf_size += temp_bytes;
 868                         buffer_offset += temp_bytes;
 869                         odev->rx_buf_missing -= temp_bytes;
 870                         count -= temp_bytes;
 871
 872                         if (!odev->rx_buf_missing) {
 873                                 /* header is complete allocate an sk_buffer and
 874                                  * continue to WAIT_DATA */
 875                                 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
 876
 877                                 if ((frame_len > DEFAULT_MRU) ||
 878                                     (frame_len < sizeof(struct iphdr))) {
 879                                         dev_err(&odev->net->dev,
 880                                                 "Invalid frame (%d) length\n",
 881                                                 frame_len);
 882                                         odev->rx_parse_state = WAIT_SYNC;
 883                                         continue;
 884                                 }
 885                                 /* Allocate an sk_buff */
 886                                 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
 887                                                                     frame_len);
 888                                 if (!odev->skb_rx_buf) {
 889                                         /* We got no receive buffer. */
 890                                         hso_dbg(0x1, "could not allocate memory\n");
 891                                         odev->rx_parse_state = WAIT_SYNC;
 892                                         continue;
 893                                 }
 894
 895                                 /* Copy what we got so far. make room for iphdr
 896                                  * after tail. */
 897                                 skb_put_data(odev->skb_rx_buf,
 898                                              (char *)&(odev->rx_ip_hdr),
 899                                              sizeof(struct iphdr));
 900
 901                                 /* ETH_HLEN */
 902                                 odev->rx_buf_size = sizeof(struct iphdr);
 903
 904                                 /* Filip actually use .tot_len */
 905                                 odev->rx_buf_missing =
 906                                     frame_len - sizeof(struct iphdr);
 907                                 odev->rx_parse_state = WAIT_DATA;
 908                         }
 909                         break;
 910
 911                 case WAIT_DATA:
 912                         temp_bytes = (count < odev->rx_buf_missing)
 913                                         ? count : odev->rx_buf_missing;
 914
 915                         /* Copy the rest of the bytes that are left in the
 916                          * buffer into the waiting sk_buf. */
 917                         /* Make room for temp_bytes after tail. */
 918                         skb_put_data(odev->skb_rx_buf,
 919                                      ip_pkt + buffer_offset,
 920                                      temp_bytes);
 921
 922                         odev->rx_buf_missing -= temp_bytes;
 923                         count -= temp_bytes;
 924                         buffer_offset += temp_bytes;
 925                         odev->rx_buf_size += temp_bytes;
 926                         if (!odev->rx_buf_missing) {
 927                                 /* Packet is complete. Inject into stack. */
 928                                 /* We have IP packet here */
 929                                 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
 930                                 skb_reset_mac_header(odev->skb_rx_buf);
 931
 932                                 /* Ship it off to the kernel */
 933                                 netif_rx(odev->skb_rx_buf);
 934                                 /* No longer our buffer. */
 935                                 odev->skb_rx_buf = NULL;
 936
 937                                 /* update out statistics */
 938                                 odev->net->stats.rx_packets++;
 939
 940                                 odev->net->stats.rx_bytes += odev->rx_buf_size;
 941
 942                                 odev->rx_buf_size = 0;
 943                                 odev->rx_buf_missing = sizeof(struct iphdr);
 944                                 odev->rx_parse_state = WAIT_IP;
 945                         }
 946                         break;
 947
 948                 case WAIT_SYNC:
 949                         hso_dbg(0x1, " W_S\n");
 950                         count = 0;
 951                         break;
 952                 default:
 953                         hso_dbg(0x1, "\n");
 954                         count--;
 955                         break;
 956                 }
 957         }
 958
 959         /* Recovery mechanism for WAIT_SYNC state. */
 960         if (is_eop) {
 961                 if (odev->rx_parse_state == WAIT_SYNC) {
 962                         odev->rx_parse_state = WAIT_IP;
 963                         odev->rx_buf_size = 0;
 964                         odev->rx_buf_missing = sizeof(struct iphdr);
 965                 }
 966         }
 967 }
 968
 969 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
 970 {
 971         static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
 972         u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
 973
 974         if (((rest == 5) || (rest == 6)) &&
 975             !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
 976                     crc_check, 4)) {
 977                 urb->actual_length -= 4;
 978         }
 979 }
 980
 981 /* Moving data from usb to kernel (in interrupt state) */
 982 static void read_bulk_callback(struct urb *urb)
 983 {
 984         struct hso_net *odev = urb->context;
 985         struct net_device *net;
 986         int result;
 987         unsigned long flags;
 988         int status = urb->status;
 989
 990         /* is al ok?  (Filip: Who's Al ?) */
 991         if (status) {
 992                 handle_usb_error(status, __func__, odev->parent);
 993                 return;
 994         }
 995
 996         /* Sanity check */
 997         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 998                 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
 999                 return;
1000         }
1001         usb_mark_last_busy(urb->dev);
1002
1003         net = odev->net;
1004
1005         if (!netif_device_present(net)) {
1006                 /* Somebody killed our network interface... */
1007                 return;
1008         }
1009
1010         if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1011                 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1012
1013         /* do we even have a packet? */
1014         if (urb->actual_length) {
1015                 /* Handle the IP stream, add header and push it onto network
1016                  * stack if the packet is complete. */
1017                 spin_lock_irqsave(&odev->net_lock, flags);
1018                 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1019                             (urb->transfer_buffer_length >
1020                              urb->actual_length) ? 1 : 0);
1021                 spin_unlock_irqrestore(&odev->net_lock, flags);
1022         }
1023
1024         /* We are done with this URB, resubmit it. Prep the USB to wait for
1025          * another frame. Reuse same as received. */
1026         usb_fill_bulk_urb(urb,
1027                           odev->parent->usb,
1028                           usb_rcvbulkpipe(odev->parent->usb,
1029                                           odev->in_endp->
1030                                           bEndpointAddress & 0x7F),
1031                           urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1032                           read_bulk_callback, odev);
1033
1034         /* Give this to the USB subsystem so it can tell us when more data
1035          * arrives. */
1036         result = usb_submit_urb(urb, GFP_ATOMIC);
1037         if (result)
1038                 dev_warn(&odev->parent->interface->dev,
1039                          "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1040                          result);
1041 }
1042
1043 /* Serial driver functions */
1044
1045 static void hso_init_termios(struct ktermios *termios)
1046 {
1047         /*
1048          * The default requirements for this device are:
1049          */
1050         termios->c_iflag &=
1051                 ~(IGNBRK        /* disable ignore break */
1052                 | BRKINT        /* disable break causes interrupt */
1053                 | PARMRK        /* disable mark parity errors */
1054                 | ISTRIP        /* disable clear high bit of input characters */
1055                 | INLCR         /* disable translate NL to CR */
1056                 | IGNCR         /* disable ignore CR */
1057                 | ICRNL         /* disable translate CR to NL */
1058                 | IXON);        /* disable enable XON/XOFF flow control */
1059
1060         /* disable postprocess output characters */
1061         termios->c_oflag &= ~OPOST;
1062
1063         termios->c_lflag &=
1064                 ~(ECHO          /* disable echo input characters */
1065                 | ECHONL        /* disable echo new line */
1066                 | ICANON        /* disable erase, kill, werase, and rprnt
1067                                    special characters */
1068                 | ISIG          /* disable interrupt, quit, and suspend special
1069                                    characters */
1070                 | IEXTEN);      /* disable non-POSIX special characters */
1071
1072         termios->c_cflag &=
1073                 ~(CSIZE         /* no size */
1074                 | PARENB        /* disable parity bit */
1075                 | CBAUD         /* clear current baud rate */
1076                 | CBAUDEX);     /* clear current buad rate */
1077
1078         termios->c_cflag |= CS8;        /* character size 8 bits */
1079
1080         /* baud rate 115200 */
1081         tty_termios_encode_baud_rate(termios, 115200, 115200);
1082 }
1083
1084 static void _hso_serial_set_termios(struct tty_struct *tty,
1085                                     struct ktermios *old)
1086 {
1087         struct hso_serial *serial = tty->driver_data;
1088
1089         if (!serial) {
1090                 pr_err("%s: no tty structures", __func__);
1091                 return;
1092         }
1093
1094         hso_dbg(0x8, "port %d\n", serial->minor);
1095
1096         /*
1097          *      Fix up unsupported bits
1098          */
1099         tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1100
1101         tty->termios.c_cflag &=
1102                 ~(CSIZE         /* no size */
1103                 | PARENB        /* disable parity bit */
1104                 | CBAUD         /* clear current baud rate */
1105                 | CBAUDEX);     /* clear current buad rate */
1106
1107         tty->termios.c_cflag |= CS8;    /* character size 8 bits */
1108
1109         /* baud rate 115200 */
1110         tty_encode_baud_rate(tty, 115200, 115200);
1111 }
1112
1113 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1114 {
1115         int result;
1116         /* We are done with this URB, resubmit it. Prep the USB to wait for
1117          * another frame */
1118         usb_fill_bulk_urb(urb, serial->parent->usb,
1119                           usb_rcvbulkpipe(serial->parent->usb,
1120                                           serial->in_endp->
1121                                           bEndpointAddress & 0x7F),
1122                           urb->transfer_buffer, serial->rx_data_length,
1123                           hso_std_serial_read_bulk_callback, serial);
1124         /* Give this to the USB subsystem so it can tell us when more data
1125          * arrives. */
1126         result = usb_submit_urb(urb, GFP_ATOMIC);
1127         if (result) {
1128                 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1129                         __func__, result);
1130         }
1131 }
1132
1133
1134
1135
1136 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1137 {
1138         int count;
1139         struct urb *curr_urb;
1140
1141         while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1142                 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1143                 count = put_rxbuf_data(curr_urb, serial);
1144                 if (count == -1)
1145                         return;
1146                 if (count == 0) {
1147                         serial->curr_rx_urb_idx++;
1148                         if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1149                                 serial->curr_rx_urb_idx = 0;
1150                         hso_resubmit_rx_bulk_urb(serial, curr_urb);
1151                 }
1152         }
1153 }
1154
1155 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1156 {
1157         int count = 0;
1158         struct urb *urb;
1159
1160         urb = serial->rx_urb[0];
1161         if (serial->port.count > 0) {
1162                 count = put_rxbuf_data(urb, serial);
1163                 if (count == -1)
1164                         return;
1165         }
1166         /* Re issue a read as long as we receive data. */
1167
1168         if (count == 0 && ((urb->actual_length != 0) ||
1169                            (serial->rx_state == RX_PENDING))) {
1170                 serial->rx_state = RX_SENT;
1171                 hso_mux_serial_read(serial);
1172         } else
1173                 serial->rx_state = RX_IDLE;
1174 }
1175
1176
1177 /* read callback for Diag and CS port */
1178 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1179 {
1180         struct hso_serial *serial = urb->context;
1181         int status = urb->status;
1182         unsigned long flags;
1183
1184         hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1185
1186         /* sanity check */
1187         if (!serial) {
1188                 hso_dbg(0x1, "serial == NULL\n");
1189                 return;
1190         }
1191         if (status) {
1192                 handle_usb_error(status, __func__, serial->parent);
1193                 return;
1194         }
1195
1196         hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1197         DUMP1(urb->transfer_buffer, urb->actual_length);
1198
1199         /* Anyone listening? */
1200         if (serial->port.count == 0)
1201                 return;
1202
1203         if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1204                 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1205         /* Valid data, handle RX data */
1206         spin_lock_irqsave(&serial->serial_lock, flags);
1207         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1208         put_rxbuf_data_and_resubmit_bulk_urb(serial);
1209         spin_unlock_irqrestore(&serial->serial_lock, flags);
1210 }
1211
1212 /*
1213  * This needs to be a tasklet otherwise we will
1214  * end up recursively calling this function.
1215  */
1216 static void hso_unthrottle_tasklet(struct tasklet_struct *t)
1217 {
1218         struct hso_serial *serial = from_tasklet(serial, t,
1219                                                  unthrottle_tasklet);
1220         unsigned long flags;
1221
1222         spin_lock_irqsave(&serial->serial_lock, flags);
1223         if ((serial->parent->port_spec & HSO_INTF_MUX))
1224                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1225         else
1226                 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1227         spin_unlock_irqrestore(&serial->serial_lock, flags);
1228 }
1229
1230 static  void hso_unthrottle(struct tty_struct *tty)
1231 {
1232         struct hso_serial *serial = tty->driver_data;
1233
1234         tasklet_hi_schedule(&serial->unthrottle_tasklet);
1235 }
1236
1237 /* open the requested serial port */
1238 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1239 {
1240         struct hso_serial *serial = get_serial_by_index(tty->index);
1241         int result;
1242
1243         /* sanity check */
1244         if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1245                 WARN_ON(1);
1246                 tty->driver_data = NULL;
1247                 hso_dbg(0x1, "Failed to open port\n");
1248                 return -ENODEV;
1249         }
1250
1251         mutex_lock(&serial->parent->mutex);
1252         result = usb_autopm_get_interface(serial->parent->interface);
1253         if (result < 0)
1254                 goto err_out;
1255
1256         hso_dbg(0x1, "Opening %d\n", serial->minor);
1257
1258         /* setup */
1259         tty->driver_data = serial;
1260         tty_port_tty_set(&serial->port, tty);
1261
1262         /* check for port already opened, if not set the termios */
1263         serial->port.count++;
1264         if (serial->port.count == 1) {
1265                 serial->rx_state = RX_IDLE;
1266                 /* Force default termio settings */
1267                 _hso_serial_set_termios(tty, NULL);
1268                 tasklet_setup(&serial->unthrottle_tasklet,
1269                               hso_unthrottle_tasklet);
1270                 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1271                 if (result) {
1272                         hso_stop_serial_device(serial->parent);
1273                         serial->port.count--;
1274                 } else {
1275                         kref_get(&serial->parent->ref);
1276                 }
1277         } else {
1278                 hso_dbg(0x1, "Port was already open\n");
1279         }
1280
1281         usb_autopm_put_interface(serial->parent->interface);
1282
1283         /* done */
1284         if (result)
1285                 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1286 err_out:
1287         mutex_unlock(&serial->parent->mutex);
1288         return result;
1289 }
1290
1291 /* close the requested serial port */
1292 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1293 {
1294         struct hso_serial *serial = tty->driver_data;
1295         u8 usb_gone;
1296
1297         hso_dbg(0x1, "Closing serial port\n");
1298
1299         /* Open failed, no close cleanup required */
1300         if (serial == NULL)
1301                 return;
1302
1303         mutex_lock(&serial->parent->mutex);
1304         usb_gone = serial->parent->usb_gone;
1305
1306         if (!usb_gone)
1307                 usb_autopm_get_interface(serial->parent->interface);
1308
1309         /* reset the rts and dtr */
1310         /* do the actual close */
1311         serial->port.count--;
1312
1313         if (serial->port.count <= 0) {
1314                 serial->port.count = 0;
1315                 tty_port_tty_set(&serial->port, NULL);
1316                 if (!usb_gone)
1317                         hso_stop_serial_device(serial->parent);
1318                 tasklet_kill(&serial->unthrottle_tasklet);
1319         }
1320
1321         if (!usb_gone)
1322                 usb_autopm_put_interface(serial->parent->interface);
1323
1324         mutex_unlock(&serial->parent->mutex);
1325 }
1326
1327 /* close the requested serial port */
1328 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1329                             int count)
1330 {
1331         struct hso_serial *serial = tty->driver_data;
1332         int space, tx_bytes;
1333         unsigned long flags;
1334
1335         /* sanity check */
1336         if (serial == NULL) {
1337                 pr_err("%s: serial is NULL\n", __func__);
1338                 return -ENODEV;
1339         }
1340
1341         spin_lock_irqsave(&serial->serial_lock, flags);
1342
1343         space = serial->tx_data_length - serial->tx_buffer_count;
1344         tx_bytes = (count < space) ? count : space;
1345
1346         if (!tx_bytes)
1347                 goto out;
1348
1349         memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1350         serial->tx_buffer_count += tx_bytes;
1351
1352 out:
1353         spin_unlock_irqrestore(&serial->serial_lock, flags);
1354
1355         hso_kick_transmit(serial);
1356         /* done */
1357         return tx_bytes;
1358 }
1359
1360 /* how much room is there for writing */
1361 static int hso_serial_write_room(struct tty_struct *tty)
1362 {
1363         struct hso_serial *serial = tty->driver_data;
1364         int room;
1365         unsigned long flags;
1366
1367         spin_lock_irqsave(&serial->serial_lock, flags);
1368         room = serial->tx_data_length - serial->tx_buffer_count;
1369         spin_unlock_irqrestore(&serial->serial_lock, flags);
1370
1371         /* return free room */
1372         return room;
1373 }
1374
1375 static void hso_serial_cleanup(struct tty_struct *tty)
1376 {
1377         struct hso_serial *serial = tty->driver_data;
1378
1379         if (!serial)
1380                 return;
1381
1382         kref_put(&serial->parent->ref, hso_serial_ref_free);
1383 }
1384
1385 /* setup the term */
1386 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1387 {
1388         struct hso_serial *serial = tty->driver_data;
1389         unsigned long flags;
1390
1391         if (old)
1392                 hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
1393                         (unsigned int)tty->termios.c_cflag,
1394                         (unsigned int)old->c_cflag);
1395
1396         /* the actual setup */
1397         spin_lock_irqsave(&serial->serial_lock, flags);
1398         if (serial->port.count)
1399                 _hso_serial_set_termios(tty, old);
1400         else
1401                 tty->termios = *old;
1402         spin_unlock_irqrestore(&serial->serial_lock, flags);
1403
1404         /* done */
1405 }
1406
1407 /* how many characters in the buffer */
1408 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1409 {
1410         struct hso_serial *serial = tty->driver_data;
1411         int chars;
1412         unsigned long flags;
1413
1414         /* sanity check */
1415         if (serial == NULL)
1416                 return 0;
1417
1418         spin_lock_irqsave(&serial->serial_lock, flags);
1419         chars = serial->tx_buffer_count;
1420         spin_unlock_irqrestore(&serial->serial_lock, flags);
1421
1422         return chars;
1423 }
1424 static int tiocmget_submit_urb(struct hso_serial *serial,
1425                                struct hso_tiocmget *tiocmget,
1426                                struct usb_device *usb)
1427 {
1428         int result;
1429
1430         if (serial->parent->usb_gone)
1431                 return -ENODEV;
1432         usb_fill_int_urb(tiocmget->urb, usb,
1433                          usb_rcvintpipe(usb,
1434                                         tiocmget->endp->
1435                                         bEndpointAddress & 0x7F),
1436                          tiocmget->serial_state_notification,
1437                          sizeof(struct hso_serial_state_notification),
1438                          tiocmget_intr_callback, serial,
1439                          tiocmget->endp->bInterval);
1440         result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1441         if (result) {
1442                 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1443                          result);
1444         }
1445         return result;
1446
1447 }
1448
1449 static void tiocmget_intr_callback(struct urb *urb)
1450 {
1451         struct hso_serial *serial = urb->context;
1452         struct hso_tiocmget *tiocmget;
1453         int status = urb->status;
1454         u16 UART_state_bitmap, prev_UART_state_bitmap;
1455         struct uart_icount *icount;
1456         struct hso_serial_state_notification *serial_state_notification;
1457         struct usb_device *usb;
1458         struct usb_interface *interface;
1459         int if_num;
1460
1461         /* Sanity checks */
1462         if (!serial)
1463                 return;
1464         if (status) {
1465                 handle_usb_error(status, __func__, serial->parent);
1466                 return;
1467         }
1468
1469         /* tiocmget is only supported on HSO_PORT_MODEM */
1470         tiocmget = serial->tiocmget;
1471         if (!tiocmget)
1472                 return;
1473         BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1474
1475         usb = serial->parent->usb;
1476         interface = serial->parent->interface;
1477
1478         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1479
1480         /* wIndex should be the USB interface number of the port to which the
1481          * notification applies, which should always be the Modem port.
1482          */
1483         serial_state_notification = tiocmget->serial_state_notification;
1484         if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1485             serial_state_notification->bNotification != B_NOTIFICATION ||
1486             le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1487             le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1488             le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1489                 dev_warn(&usb->dev,
1490                          "hso received invalid serial state notification\n");
1491                 DUMP(serial_state_notification,
1492                      sizeof(struct hso_serial_state_notification));
1493         } else {
1494                 unsigned long flags;
1495
1496                 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1497                                                 UART_state_bitmap);
1498                 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1499                 icount = &tiocmget->icount;
1500                 spin_lock_irqsave(&serial->serial_lock, flags);
1501                 if ((UART_state_bitmap & B_OVERRUN) !=
1502                    (prev_UART_state_bitmap & B_OVERRUN))
1503                         icount->parity++;
1504                 if ((UART_state_bitmap & B_PARITY) !=
1505                    (prev_UART_state_bitmap & B_PARITY))
1506                         icount->parity++;
1507                 if ((UART_state_bitmap & B_FRAMING) !=
1508                    (prev_UART_state_bitmap & B_FRAMING))
1509                         icount->frame++;
1510                 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1511                    !(prev_UART_state_bitmap & B_RING_SIGNAL))
1512                         icount->rng++;
1513                 if ((UART_state_bitmap & B_BREAK) !=
1514                    (prev_UART_state_bitmap & B_BREAK))
1515                         icount->brk++;
1516                 if ((UART_state_bitmap & B_TX_CARRIER) !=
1517                    (prev_UART_state_bitmap & B_TX_CARRIER))
1518                         icount->dsr++;
1519                 if ((UART_state_bitmap & B_RX_CARRIER) !=
1520                    (prev_UART_state_bitmap & B_RX_CARRIER))
1521                         icount->dcd++;
1522                 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1523                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1524                 tiocmget->intr_completed = 1;
1525                 wake_up_interruptible(&tiocmget->waitq);
1526         }
1527         memset(serial_state_notification, 0,
1528                sizeof(struct hso_serial_state_notification));
1529         tiocmget_submit_urb(serial,
1530                             tiocmget,
1531                             serial->parent->usb);
1532 }
1533
1534 /*
1535  * next few functions largely stolen from drivers/serial/serial_core.c
1536  */
1537 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1538  * - mask passed in arg for lines of interest
1539  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1540  * Caller should use TIOCGICOUNT to see which one it was
1541  */
1542 static int
1543 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1544 {
1545         DECLARE_WAITQUEUE(wait, current);
1546         struct uart_icount cprev, cnow;
1547         struct hso_tiocmget  *tiocmget;
1548         int ret;
1549
1550         tiocmget = serial->tiocmget;
1551         if (!tiocmget)
1552                 return -ENOENT;
1553         /*
1554          * note the counters on entry
1555          */
1556         spin_lock_irq(&serial->serial_lock);
1557         memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1558         spin_unlock_irq(&serial->serial_lock);
1559         add_wait_queue(&tiocmget->waitq, &wait);
1560         for (;;) {
1561                 spin_lock_irq(&serial->serial_lock);
1562                 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1563                 spin_unlock_irq(&serial->serial_lock);
1564                 set_current_state(TASK_INTERRUPTIBLE);
1565                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1566                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1567                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
1568                         ret = 0;
1569                         break;
1570                 }
1571                 schedule();
1572                 /* see if a signal did it */
1573                 if (signal_pending(current)) {
1574                         ret = -ERESTARTSYS;
1575                         break;
1576                 }
1577                 cprev = cnow;
1578         }
1579         __set_current_state(TASK_RUNNING);
1580         remove_wait_queue(&tiocmget->waitq, &wait);
1581
1582         return ret;
1583 }
1584
1585 /*
1586  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1587  * Return: write counters to the user passed counter struct
1588  * NB: both 1->0 and 0->1 transitions are counted except for
1589  *     RI where only 0->1 is counted.
1590  */
1591 static int hso_get_count(struct tty_struct *tty,
1592                   struct serial_icounter_struct *icount)
1593 {
1594         struct uart_icount cnow;
1595         struct hso_serial *serial = tty->driver_data;
1596         struct hso_tiocmget  *tiocmget = serial->tiocmget;
1597
1598         memset(icount, 0, sizeof(struct serial_icounter_struct));
1599
1600         if (!tiocmget)
1601                  return -ENOENT;
1602         spin_lock_irq(&serial->serial_lock);
1603         memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1604         spin_unlock_irq(&serial->serial_lock);
1605
1606         icount->cts         = cnow.cts;
1607         icount->dsr         = cnow.dsr;
1608         icount->rng         = cnow.rng;
1609         icount->dcd         = cnow.dcd;
1610         icount->rx          = cnow.rx;
1611         icount->tx          = cnow.tx;
1612         icount->frame       = cnow.frame;
1613         icount->overrun     = cnow.overrun;
1614         icount->parity      = cnow.parity;
1615         icount->brk         = cnow.brk;
1616         icount->buf_overrun = cnow.buf_overrun;
1617
1618         return 0;
1619 }
1620
1621
1622 static int hso_serial_tiocmget(struct tty_struct *tty)
1623 {
1624         int retval;
1625         struct hso_serial *serial = tty->driver_data;
1626         struct hso_tiocmget  *tiocmget;
1627         u16 UART_state_bitmap;
1628
1629         /* sanity check */
1630         if (!serial) {
1631                 hso_dbg(0x1, "no tty structures\n");
1632                 return -EINVAL;
1633         }
1634         spin_lock_irq(&serial->serial_lock);
1635         retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1636             ((serial->dtr_state) ? TIOCM_DTR : 0);
1637         tiocmget = serial->tiocmget;
1638         if (tiocmget) {
1639
1640                 UART_state_bitmap = le16_to_cpu(
1641                         tiocmget->prev_UART_state_bitmap);
1642                 if (UART_state_bitmap & B_RING_SIGNAL)
1643                         retval |=  TIOCM_RNG;
1644                 if (UART_state_bitmap & B_RX_CARRIER)
1645                         retval |=  TIOCM_CD;
1646                 if (UART_state_bitmap & B_TX_CARRIER)
1647                         retval |=  TIOCM_DSR;
1648         }
1649         spin_unlock_irq(&serial->serial_lock);
1650         return retval;
1651 }
1652
1653 static int hso_serial_tiocmset(struct tty_struct *tty,
1654                                unsigned int set, unsigned int clear)
1655 {
1656         int val = 0;
1657         unsigned long flags;
1658         int if_num;
1659         struct hso_serial *serial = tty->driver_data;
1660         struct usb_interface *interface;
1661
1662         /* sanity check */
1663         if (!serial) {
1664                 hso_dbg(0x1, "no tty structures\n");
1665                 return -EINVAL;
1666         }
1667
1668         if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1669                 return -EINVAL;
1670
1671         interface = serial->parent->interface;
1672         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1673
1674         spin_lock_irqsave(&serial->serial_lock, flags);
1675         if (set & TIOCM_RTS)
1676                 serial->rts_state = 1;
1677         if (set & TIOCM_DTR)
1678                 serial->dtr_state = 1;
1679
1680         if (clear & TIOCM_RTS)
1681                 serial->rts_state = 0;
1682         if (clear & TIOCM_DTR)
1683                 serial->dtr_state = 0;
1684
1685         if (serial->dtr_state)
1686                 val |= 0x01;
1687         if (serial->rts_state)
1688                 val |= 0x02;
1689
1690         spin_unlock_irqrestore(&serial->serial_lock, flags);
1691
1692         return usb_control_msg(serial->parent->usb,
1693                                usb_rcvctrlpipe(serial->parent->usb, 0), 0x22,
1694                                0x21, val, if_num, NULL, 0,
1695                                USB_CTRL_SET_TIMEOUT);
1696 }
1697
1698 static int hso_serial_ioctl(struct tty_struct *tty,
1699                             unsigned int cmd, unsigned long arg)
1700 {
1701         struct hso_serial *serial = tty->driver_data;
1702         int ret = 0;
1703         hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1704
1705         if (!serial)
1706                 return -ENODEV;
1707         switch (cmd) {
1708         case TIOCMIWAIT:
1709                 ret = hso_wait_modem_status(serial, arg);
1710                 break;
1711         default:
1712                 ret = -ENOIOCTLCMD;
1713                 break;
1714         }
1715         return ret;
1716 }
1717
1718
1719 /* starts a transmit */
1720 static void hso_kick_transmit(struct hso_serial *serial)
1721 {
1722         unsigned long flags;
1723         int res;
1724
1725         spin_lock_irqsave(&serial->serial_lock, flags);
1726         if (!serial->tx_buffer_count)
1727                 goto out;
1728
1729         if (serial->tx_urb_used)
1730                 goto out;
1731
1732         /* Wakeup USB interface if necessary */
1733         if (hso_get_activity(serial->parent) == -EAGAIN)
1734                 goto out;
1735
1736         /* Switch pointers around to avoid memcpy */
1737         swap(serial->tx_buffer, serial->tx_data);
1738         serial->tx_data_count = serial->tx_buffer_count;
1739         serial->tx_buffer_count = 0;
1740
1741         /* If serial->tx_data is set, it means we switched buffers */
1742         if (serial->tx_data && serial->write_data) {
1743                 res = serial->write_data(serial);
1744                 if (res >= 0)
1745                         serial->tx_urb_used = 1;
1746         }
1747 out:
1748         spin_unlock_irqrestore(&serial->serial_lock, flags);
1749 }
1750
1751 /* make a request (for reading and writing data to muxed serial port) */
1752 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1753                               struct urb *ctrl_urb,
1754                               struct usb_ctrlrequest *ctrl_req,
1755                               u8 *ctrl_urb_data, u32 size)
1756 {
1757         int result;
1758         int pipe;
1759
1760         /* Sanity check */
1761         if (!serial || !ctrl_urb || !ctrl_req) {
1762                 pr_err("%s: Wrong arguments\n", __func__);
1763                 return -EINVAL;
1764         }
1765
1766         /* initialize */
1767         ctrl_req->wValue = 0;
1768         ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1769         ctrl_req->wLength = cpu_to_le16(size);
1770
1771         if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1772                 /* Reading command */
1773                 ctrl_req->bRequestType = USB_DIR_IN |
1774                                          USB_TYPE_OPTION_VENDOR |
1775                                          USB_RECIP_INTERFACE;
1776                 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1777                 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1778         } else {
1779                 /* Writing command */
1780                 ctrl_req->bRequestType = USB_DIR_OUT |
1781                                          USB_TYPE_OPTION_VENDOR |
1782                                          USB_RECIP_INTERFACE;
1783                 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1784                 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1785         }
1786         /* syslog */
1787         hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1788                 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1789                 ctrl_req->bRequestType, ctrl_req->wLength, port);
1790
1791         /* Load ctrl urb */
1792         ctrl_urb->transfer_flags = 0;
1793         usb_fill_control_urb(ctrl_urb,
1794                              serial->parent->usb,
1795                              pipe,
1796                              (u8 *) ctrl_req,
1797                              ctrl_urb_data, size, ctrl_callback, serial);
1798         /* Send it on merry way */
1799         result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1800         if (result) {
1801                 dev_err(&ctrl_urb->dev->dev,
1802                         "%s failed submit ctrl_urb %d type %d\n", __func__,
1803                         result, type);
1804                 return result;
1805         }
1806
1807         /* done */
1808         return size;
1809 }
1810
1811 /* called by intr_callback when read occurs */
1812 static int hso_mux_serial_read(struct hso_serial *serial)
1813 {
1814         if (!serial)
1815                 return -EINVAL;
1816
1817         /* clean data */
1818         memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1819         /* make the request */
1820
1821         if (serial->num_rx_urbs != 1) {
1822                 dev_err(&serial->parent->interface->dev,
1823                         "ERROR: mux'd reads with multiple buffers "
1824                         "not possible\n");
1825                 return 0;
1826         }
1827         return mux_device_request(serial,
1828                                   USB_CDC_GET_ENCAPSULATED_RESPONSE,
1829                                   serial->parent->port_spec & HSO_PORT_MASK,
1830                                   serial->rx_urb[0],
1831                                   &serial->ctrl_req_rx,
1832                                   serial->rx_data[0], serial->rx_data_length);
1833 }
1834
1835 /* used for muxed serial port callback (muxed serial read) */
1836 static void intr_callback(struct urb *urb)
1837 {
1838         struct hso_shared_int *shared_int = urb->context;
1839         struct hso_serial *serial;
1840         unsigned char *port_req;
1841         int status = urb->status;
1842         unsigned long flags;
1843         int i;
1844
1845         usb_mark_last_busy(urb->dev);
1846
1847         /* sanity check */
1848         if (!shared_int)
1849                 return;
1850
1851         /* status check */
1852         if (status) {
1853                 handle_usb_error(status, __func__, NULL);
1854                 return;
1855         }
1856         hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1857
1858         /* what request? */
1859         port_req = urb->transfer_buffer;
1860         hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1861         /* loop over all muxed ports to find the one sending this */
1862         for (i = 0; i < 8; i++) {
1863                 /* max 8 channels on MUX */
1864                 if (*port_req & (1 << i)) {
1865                         serial = get_serial_by_shared_int_and_type(shared_int,
1866                                                                    (1 << i));
1867                         if (serial != NULL) {
1868                                 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1869                                         i);
1870                                 spin_lock_irqsave(&serial->serial_lock, flags);
1871                                 if (serial->rx_state == RX_IDLE &&
1872                                         serial->port.count > 0) {
1873                                         /* Setup and send a ctrl req read on
1874                                          * port i */
1875                                         if (!serial->rx_urb_filled[0]) {
1876                                                 serial->rx_state = RX_SENT;
1877                                                 hso_mux_serial_read(serial);
1878                                         } else
1879                                                 serial->rx_state = RX_PENDING;
1880                                 } else {
1881                                         hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1882                                                 i);
1883                                 }
1884                                 spin_unlock_irqrestore(&serial->serial_lock,
1885                                                        flags);
1886                         }
1887                 }
1888         }
1889         /* Resubmit interrupt urb */
1890         hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1891 }
1892
1893 /* called for writing to muxed serial port */
1894 static int hso_mux_serial_write_data(struct hso_serial *serial)
1895 {
1896         if (NULL == serial)
1897                 return -EINVAL;
1898
1899         return mux_device_request(serial,
1900                                   USB_CDC_SEND_ENCAPSULATED_COMMAND,
1901                                   serial->parent->port_spec & HSO_PORT_MASK,
1902                                   serial->tx_urb,
1903                                   &serial->ctrl_req_tx,
1904                                   serial->tx_data, serial->tx_data_count);
1905 }
1906
1907 /* write callback for Diag and CS port */
1908 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1909 {
1910         struct hso_serial *serial = urb->context;
1911         int status = urb->status;
1912         unsigned long flags;
1913
1914         /* sanity check */
1915         if (!serial) {
1916                 hso_dbg(0x1, "serial == NULL\n");
1917                 return;
1918         }
1919
1920         spin_lock_irqsave(&serial->serial_lock, flags);
1921         serial->tx_urb_used = 0;
1922         spin_unlock_irqrestore(&serial->serial_lock, flags);
1923         if (status) {
1924                 handle_usb_error(status, __func__, serial->parent);
1925                 return;
1926         }
1927         hso_put_activity(serial->parent);
1928         tty_port_tty_wakeup(&serial->port);
1929         hso_kick_transmit(serial);
1930
1931         hso_dbg(0x1, "\n");
1932 }
1933
1934 /* called for writing diag or CS serial port */
1935 static int hso_std_serial_write_data(struct hso_serial *serial)
1936 {
1937         int count = serial->tx_data_count;
1938         int result;
1939
1940         usb_fill_bulk_urb(serial->tx_urb,
1941                           serial->parent->usb,
1942                           usb_sndbulkpipe(serial->parent->usb,
1943                                           serial->out_endp->
1944                                           bEndpointAddress & 0x7F),
1945                           serial->tx_data, serial->tx_data_count,
1946                           hso_std_serial_write_bulk_callback, serial);
1947
1948         result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1949         if (result) {
1950                 dev_warn(&serial->parent->usb->dev,
1951                          "Failed to submit urb - res %d\n", result);
1952                 return result;
1953         }
1954
1955         return count;
1956 }
1957
1958 /* callback after read or write on muxed serial port */
1959 static void ctrl_callback(struct urb *urb)
1960 {
1961         struct hso_serial *serial = urb->context;
1962         struct usb_ctrlrequest *req;
1963         int status = urb->status;
1964         unsigned long flags;
1965
1966         /* sanity check */
1967         if (!serial)
1968                 return;
1969
1970         spin_lock_irqsave(&serial->serial_lock, flags);
1971         serial->tx_urb_used = 0;
1972         spin_unlock_irqrestore(&serial->serial_lock, flags);
1973         if (status) {
1974                 handle_usb_error(status, __func__, serial->parent);
1975                 return;
1976         }
1977
1978         /* what request? */
1979         req = (struct usb_ctrlrequest *)(urb->setup_packet);
1980         hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1981         hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1982         DUMP1(urb->transfer_buffer, urb->actual_length);
1983
1984         if (req->bRequestType ==
1985             (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1986                 /* response to a read command */
1987                 serial->rx_urb_filled[0] = 1;
1988                 spin_lock_irqsave(&serial->serial_lock, flags);
1989                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1990                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1991         } else {
1992                 hso_put_activity(serial->parent);
1993                 tty_port_tty_wakeup(&serial->port);
1994                 /* response to a write command */
1995                 hso_kick_transmit(serial);
1996         }
1997 }
1998
1999 /* handle RX data for serial port */
2000 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
2001 {
2002         struct tty_struct *tty;
2003         int count;
2004
2005         /* Sanity check */
2006         if (urb == NULL || serial == NULL) {
2007                 hso_dbg(0x1, "serial = NULL\n");
2008                 return -2;
2009         }
2010
2011         tty = tty_port_tty_get(&serial->port);
2012
2013         if (tty && tty_throttled(tty)) {
2014                 tty_kref_put(tty);
2015                 return -1;
2016         }
2017
2018         /* Push data to tty */
2019         hso_dbg(0x1, "data to push to tty\n");
2020         count = tty_buffer_request_room(&serial->port, urb->actual_length);
2021         if (count >= urb->actual_length) {
2022                 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2023                                        urb->actual_length);
2024                 tty_flip_buffer_push(&serial->port);
2025         } else {
2026                 dev_warn(&serial->parent->usb->dev,
2027                          "dropping data, %d bytes lost\n", urb->actual_length);
2028         }
2029
2030         tty_kref_put(tty);
2031
2032         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2033
2034         return 0;
2035 }
2036
2037
2038 /* Base driver functions */
2039
2040 static void hso_log_port(struct hso_device *hso_dev)
2041 {
2042         char *port_type;
2043         char port_dev[20];
2044
2045         switch (hso_dev->port_spec & HSO_PORT_MASK) {
2046         case HSO_PORT_CONTROL:
2047                 port_type = "Control";
2048                 break;
2049         case HSO_PORT_APP:
2050                 port_type = "Application";
2051                 break;
2052         case HSO_PORT_GPS:
2053                 port_type = "GPS";
2054                 break;
2055         case HSO_PORT_GPS_CONTROL:
2056                 port_type = "GPS control";
2057                 break;
2058         case HSO_PORT_APP2:
2059                 port_type = "Application2";
2060                 break;
2061         case HSO_PORT_PCSC:
2062                 port_type = "PCSC";
2063                 break;
2064         case HSO_PORT_DIAG:
2065                 port_type = "Diagnostic";
2066                 break;
2067         case HSO_PORT_DIAG2:
2068                 port_type = "Diagnostic2";
2069                 break;
2070         case HSO_PORT_MODEM:
2071                 port_type = "Modem";
2072                 break;
2073         case HSO_PORT_NETWORK:
2074                 port_type = "Network";
2075                 break;
2076         default:
2077                 port_type = "Unknown";
2078                 break;
2079         }
2080         if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2081                 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2082         } else
2083                 sprintf(port_dev, "/dev/%s%d", tty_filename,
2084                         dev2ser(hso_dev)->minor);
2085
2086         dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2087                 port_type, port_dev);
2088 }
2089
2090 static int hso_start_net_device(struct hso_device *hso_dev)
2091 {
2092         int i, result = 0;
2093         struct hso_net *hso_net = dev2net(hso_dev);
2094
2095         if (!hso_net)
2096                 return -ENODEV;
2097
2098         /* send URBs for all read buffers */
2099         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2100
2101                 /* Prep a receive URB */
2102                 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2103                                   hso_dev->usb,
2104                                   usb_rcvbulkpipe(hso_dev->usb,
2105                                                   hso_net->in_endp->
2106                                                   bEndpointAddress & 0x7F),
2107                                   hso_net->mux_bulk_rx_buf_pool[i],
2108                                   MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2109                                   hso_net);
2110
2111                 /* Put it out there so the device can send us stuff */
2112                 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2113                                         GFP_NOIO);
2114                 if (result)
2115                         dev_warn(&hso_dev->usb->dev,
2116                                 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2117                                 i, result);
2118         }
2119
2120         return result;
2121 }
2122
2123 static int hso_stop_net_device(struct hso_device *hso_dev)
2124 {
2125         int i;
2126         struct hso_net *hso_net = dev2net(hso_dev);
2127
2128         if (!hso_net)
2129                 return -ENODEV;
2130
2131         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2132                 if (hso_net->mux_bulk_rx_urb_pool[i])
2133                         usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2134
2135         }
2136         if (hso_net->mux_bulk_tx_urb)
2137                 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2138
2139         return 0;
2140 }
2141
2142 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2143 {
2144         int i, result = 0;
2145         struct hso_serial *serial = dev2ser(hso_dev);
2146
2147         if (!serial)
2148                 return -ENODEV;
2149
2150         /* If it is not the MUX port fill in and submit a bulk urb (already
2151          * allocated in hso_serial_start) */
2152         if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2153                 for (i = 0; i < serial->num_rx_urbs; i++) {
2154                         usb_fill_bulk_urb(serial->rx_urb[i],
2155                                           serial->parent->usb,
2156                                           usb_rcvbulkpipe(serial->parent->usb,
2157                                                           serial->in_endp->
2158                                                           bEndpointAddress &
2159                                                           0x7F),
2160                                           serial->rx_data[i],
2161                                           serial->rx_data_length,
2162                                           hso_std_serial_read_bulk_callback,
2163                                           serial);
2164                         result = usb_submit_urb(serial->rx_urb[i], flags);
2165                         if (result) {
2166                                 dev_warn(&serial->parent->usb->dev,
2167                                          "Failed to submit urb - res %d\n",
2168                                          result);
2169                                 break;
2170                         }
2171                 }
2172         } else {
2173                 mutex_lock(&serial->shared_int->shared_int_lock);
2174                 if (!serial->shared_int->use_count) {
2175                         result =
2176                             hso_mux_submit_intr_urb(serial->shared_int,
2177                                                     hso_dev->usb, flags);
2178                 }
2179                 serial->shared_int->use_count++;
2180                 mutex_unlock(&serial->shared_int->shared_int_lock);
2181         }
2182         if (serial->tiocmget)
2183                 tiocmget_submit_urb(serial,
2184                                     serial->tiocmget,
2185                                     serial->parent->usb);
2186         return result;
2187 }
2188
2189 static int hso_stop_serial_device(struct hso_device *hso_dev)
2190 {
2191         int i;
2192         struct hso_serial *serial = dev2ser(hso_dev);
2193         struct hso_tiocmget  *tiocmget;
2194
2195         if (!serial)
2196                 return -ENODEV;
2197
2198         for (i = 0; i < serial->num_rx_urbs; i++) {
2199                 if (serial->rx_urb[i]) {
2200                         usb_kill_urb(serial->rx_urb[i]);
2201                         serial->rx_urb_filled[i] = 0;
2202                 }
2203         }
2204         serial->curr_rx_urb_idx = 0;
2205
2206         if (serial->tx_urb)
2207                 usb_kill_urb(serial->tx_urb);
2208
2209         if (serial->shared_int) {
2210                 mutex_lock(&serial->shared_int->shared_int_lock);
2211                 if (serial->shared_int->use_count &&
2212                     (--serial->shared_int->use_count == 0)) {
2213                         struct urb *urb;
2214
2215                         urb = serial->shared_int->shared_intr_urb;
2216                         if (urb)
2217                                 usb_kill_urb(urb);
2218                 }
2219                 mutex_unlock(&serial->shared_int->shared_int_lock);
2220         }
2221         tiocmget = serial->tiocmget;
2222         if (tiocmget) {
2223                 wake_up_interruptible(&tiocmget->waitq);
2224                 usb_kill_urb(tiocmget->urb);
2225         }
2226
2227         return 0;
2228 }
2229
2230 static void hso_serial_tty_unregister(struct hso_serial *serial)
2231 {
2232         tty_unregister_device(tty_drv, serial->minor);
2233 }
2234
2235 static void hso_serial_common_free(struct hso_serial *serial)
2236 {
2237         int i;
2238
2239         for (i = 0; i < serial->num_rx_urbs; i++) {
2240                 /* unlink and free RX URB */
2241                 usb_free_urb(serial->rx_urb[i]);
2242                 /* free the RX buffer */
2243                 kfree(serial->rx_data[i]);
2244         }
2245
2246         /* unlink and free TX URB */
2247         usb_free_urb(serial->tx_urb);
2248         kfree(serial->tx_buffer);
2249         kfree(serial->tx_data);
2250         tty_port_destroy(&serial->port);
2251 }
2252
2253 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2254                                     int rx_size, int tx_size)
2255 {
2256         int minor;
2257         int i;
2258
2259         tty_port_init(&serial->port);
2260
2261         minor = get_free_serial_index();
2262         if (minor < 0)
2263                 goto exit2;
2264
2265         /* register our minor number */
2266         serial->parent->dev = tty_port_register_device_attr(&serial->port,
2267                         tty_drv, minor, &serial->parent->interface->dev,
2268                         serial->parent, hso_serial_dev_groups);
2269         if (IS_ERR(serial->parent->dev))
2270                 goto exit2;
2271
2272         /* fill in specific data for later use */
2273         serial->minor = minor;
2274         serial->magic = HSO_SERIAL_MAGIC;
2275         spin_lock_init(&serial->serial_lock);
2276         serial->num_rx_urbs = num_urbs;
2277
2278         /* RX, allocate urb and initialize */
2279
2280         /* prepare our RX buffer */
2281         serial->rx_data_length = rx_size;
2282         for (i = 0; i < serial->num_rx_urbs; i++) {
2283                 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2284                 if (!serial->rx_urb[i])
2285                         goto exit;
2286                 serial->rx_urb[i]->transfer_buffer = NULL;
2287                 serial->rx_urb[i]->transfer_buffer_length = 0;
2288                 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2289                                              GFP_KERNEL);
2290                 if (!serial->rx_data[i])
2291                         goto exit;
2292         }
2293
2294         /* TX, allocate urb and initialize */
2295         serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2296         if (!serial->tx_urb)
2297                 goto exit;
2298         serial->tx_urb->transfer_buffer = NULL;
2299         serial->tx_urb->transfer_buffer_length = 0;
2300         /* prepare our TX buffer */
2301         serial->tx_data_count = 0;
2302         serial->tx_buffer_count = 0;
2303         serial->tx_data_length = tx_size;
2304         serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2305         if (!serial->tx_data)
2306                 goto exit;
2307
2308         serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2309         if (!serial->tx_buffer)
2310                 goto exit;
2311
2312         return 0;
2313 exit:
2314         hso_serial_tty_unregister(serial);
2315 exit2:
2316         hso_serial_common_free(serial);
2317         return -1;
2318 }
2319
2320 /* Creates a general hso device */
2321 static struct hso_device *hso_create_device(struct usb_interface *intf,
2322                                             int port_spec)
2323 {
2324         struct hso_device *hso_dev;
2325
2326         hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2327         if (!hso_dev)
2328                 return NULL;
2329
2330         hso_dev->port_spec = port_spec;
2331         hso_dev->usb = interface_to_usbdev(intf);
2332         hso_dev->interface = intf;
2333         kref_init(&hso_dev->ref);
2334         mutex_init(&hso_dev->mutex);
2335
2336         INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2337         INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2338
2339         return hso_dev;
2340 }
2341
2342 /* Removes a network device in the network device table */
2343 static int remove_net_device(struct hso_device *hso_dev)
2344 {
2345         int i;
2346
2347         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2348                 if (network_table[i] == hso_dev) {
2349                         network_table[i] = NULL;
2350                         break;
2351                 }
2352         }
2353         if (i == HSO_MAX_NET_DEVICES)
2354                 return -1;
2355         return 0;
2356 }
2357
2358 /* Frees our network device */
2359 static void hso_free_net_device(struct hso_device *hso_dev, bool bailout)
2360 {
2361         int i;
2362         struct hso_net *hso_net = dev2net(hso_dev);
2363
2364         if (!hso_net)
2365                 return;
2366
2367         remove_net_device(hso_net->parent);
2368
2369         if (hso_net->net)
2370                 unregister_netdev(hso_net->net);
2371
2372         /* start freeing */
2373         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2374                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2375                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2376                 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2377         }
2378         usb_free_urb(hso_net->mux_bulk_tx_urb);
2379         kfree(hso_net->mux_bulk_tx_buf);
2380         hso_net->mux_bulk_tx_buf = NULL;
2381
2382         if (hso_net->net && !bailout)
2383                 free_netdev(hso_net->net);
2384
2385         kfree(hso_dev);
2386 }
2387
2388 static const struct net_device_ops hso_netdev_ops = {
2389         .ndo_open       = hso_net_open,
2390         .ndo_stop       = hso_net_close,
2391         .ndo_start_xmit = hso_net_start_xmit,
2392         .ndo_tx_timeout = hso_net_tx_timeout,
2393 };
2394
2395 /* initialize the network interface */
2396 static void hso_net_init(struct net_device *net)
2397 {
2398         struct hso_net *hso_net = netdev_priv(net);
2399
2400         hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2401
2402         /* fill in the other fields */
2403         net->netdev_ops = &hso_netdev_ops;
2404         net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2405         net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2406         net->type = ARPHRD_NONE;
2407         net->mtu = DEFAULT_MTU - 14;
2408         net->tx_queue_len = 10;
2409         net->ethtool_ops = &ops;
2410
2411         /* and initialize the semaphore */
2412         spin_lock_init(&hso_net->net_lock);
2413 }
2414
2415 /* Adds a network device in the network device table */
2416 static int add_net_device(struct hso_device *hso_dev)
2417 {
2418         int i;
2419
2420         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2421                 if (network_table[i] == NULL) {
2422                         network_table[i] = hso_dev;
2423                         break;
2424                 }
2425         }
2426         if (i == HSO_MAX_NET_DEVICES)
2427                 return -1;
2428         return 0;
2429 }
2430
2431 static int hso_rfkill_set_block(void *data, bool blocked)
2432 {
2433         struct hso_device *hso_dev = data;
2434         int enabled = !blocked;
2435         int rv;
2436
2437         mutex_lock(&hso_dev->mutex);
2438         if (hso_dev->usb_gone)
2439                 rv = 0;
2440         else
2441                 rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
2442                                        enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2443                                        USB_CTRL_SET_TIMEOUT);
2444         mutex_unlock(&hso_dev->mutex);
2445         return rv;
2446 }
2447
2448 static const struct rfkill_ops hso_rfkill_ops = {
2449         .set_block = hso_rfkill_set_block,
2450 };
2451
2452 /* Creates and sets up everything for rfkill */
2453 static void hso_create_rfkill(struct hso_device *hso_dev,
2454                              struct usb_interface *interface)
2455 {
2456         struct hso_net *hso_net = dev2net(hso_dev);
2457         struct device *dev = &hso_net->net->dev;
2458         static u32 rfkill_counter;
2459
2460         snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2461                  rfkill_counter++);
2462
2463         hso_net->rfkill = rfkill_alloc(hso_net->name,
2464                                        &interface_to_usbdev(interface)->dev,
2465                                        RFKILL_TYPE_WWAN,
2466                                        &hso_rfkill_ops, hso_dev);
2467         if (!hso_net->rfkill)
2468                 return;
2469
2470         if (rfkill_register(hso_net->rfkill) < 0) {
2471                 rfkill_destroy(hso_net->rfkill);
2472                 hso_net->rfkill = NULL;
2473                 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2474                 return;
2475         }
2476 }
2477
2478 static struct device_type hso_type = {
2479         .name   = "wwan",
2480 };
2481
2482 /* Creates our network device */
2483 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2484                                                 int port_spec)
2485 {
2486         int result, i;
2487         struct net_device *net;
2488         struct hso_net *hso_net;
2489         struct hso_device *hso_dev;
2490
2491         hso_dev = hso_create_device(interface, port_spec);
2492         if (!hso_dev)
2493                 return NULL;
2494
2495         /* allocate our network device, then we can put in our private data */
2496         /* call hso_net_init to do the basic initialization */
2497         net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2498                            hso_net_init);
2499         if (!net) {
2500                 dev_err(&interface->dev, "Unable to create ethernet device\n");
2501                 goto exit;
2502         }
2503
2504         hso_net = netdev_priv(net);
2505
2506         hso_dev->port_data.dev_net = hso_net;
2507         hso_net->net = net;
2508         hso_net->parent = hso_dev;
2509
2510         hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2511                                       USB_DIR_IN);
2512         if (!hso_net->in_endp) {
2513                 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2514                 goto exit;
2515         }
2516         hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2517                                        USB_DIR_OUT);
2518         if (!hso_net->out_endp) {
2519                 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2520                 goto exit;
2521         }
2522         SET_NETDEV_DEV(net, &interface->dev);
2523         SET_NETDEV_DEVTYPE(net, &hso_type);
2524
2525         /* start allocating */
2526         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2527                 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2528                 if (!hso_net->mux_bulk_rx_urb_pool[i])
2529                         goto exit;
2530                 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2531                                                            GFP_KERNEL);
2532                 if (!hso_net->mux_bulk_rx_buf_pool[i])
2533                         goto exit;
2534         }
2535         hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2536         if (!hso_net->mux_bulk_tx_urb)
2537                 goto exit;
2538         hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2539         if (!hso_net->mux_bulk_tx_buf)
2540                 goto exit;
2541
2542         add_net_device(hso_dev);
2543
2544         /* registering our net device */
2545         result = register_netdev(net);
2546         if (result) {
2547                 dev_err(&interface->dev, "Failed to register device\n");
2548                 goto exit;
2549         }
2550
2551         hso_log_port(hso_dev);
2552
2553         hso_create_rfkill(hso_dev, interface);
2554
2555         return hso_dev;
2556 exit:
2557         hso_free_net_device(hso_dev, true);
2558         return NULL;
2559 }
2560
2561 static void hso_free_tiomget(struct hso_serial *serial)
2562 {
2563         struct hso_tiocmget *tiocmget;
2564         if (!serial)
2565                 return;
2566         tiocmget = serial->tiocmget;
2567         if (tiocmget) {
2568                 usb_free_urb(tiocmget->urb);
2569                 tiocmget->urb = NULL;
2570                 serial->tiocmget = NULL;
2571                 kfree(tiocmget->serial_state_notification);
2572                 tiocmget->serial_state_notification = NULL;
2573                 kfree(tiocmget);
2574         }
2575 }
2576
2577 /* Frees an AT channel ( goes for both mux and non-mux ) */
2578 static void hso_free_serial_device(struct hso_device *hso_dev)
2579 {
2580         struct hso_serial *serial = dev2ser(hso_dev);
2581
2582         if (!serial)
2583                 return;
2584
2585         hso_serial_common_free(serial);
2586
2587         if (serial->shared_int) {
2588                 mutex_lock(&serial->shared_int->shared_int_lock);
2589                 if (--serial->shared_int->ref_count == 0)
2590                         hso_free_shared_int(serial->shared_int);
2591                 else
2592                         mutex_unlock(&serial->shared_int->shared_int_lock);
2593         }
2594         hso_free_tiomget(serial);
2595         kfree(serial);
2596         kfree(hso_dev);
2597 }
2598
2599 /* Creates a bulk AT channel */
2600 static struct hso_device *hso_create_bulk_serial_device(
2601                         struct usb_interface *interface, int port)
2602 {
2603         struct hso_device *hso_dev;
2604         struct hso_serial *serial;
2605         int num_urbs;
2606         struct hso_tiocmget *tiocmget;
2607
2608         hso_dev = hso_create_device(interface, port);
2609         if (!hso_dev)
2610                 return NULL;
2611
2612         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2613         if (!serial)
2614                 goto exit;
2615
2616         serial->parent = hso_dev;
2617         hso_dev->port_data.dev_serial = serial;
2618
2619         if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2620                 num_urbs = 2;
2621                 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2622                                            GFP_KERNEL);
2623                 serial->tiocmget->serial_state_notification
2624                         = kzalloc(sizeof(struct hso_serial_state_notification),
2625                                            GFP_KERNEL);
2626                 /* it isn't going to break our heart if serial->tiocmget
2627                  *  allocation fails don't bother checking this.
2628                  */
2629                 if (serial->tiocmget && serial->tiocmget->serial_state_notification) {
2630                         tiocmget = serial->tiocmget;
2631                         tiocmget->endp = hso_get_ep(interface,
2632                                                     USB_ENDPOINT_XFER_INT,
2633                                                     USB_DIR_IN);
2634                         if (!tiocmget->endp) {
2635                                 dev_err(&interface->dev, "Failed to find INT IN ep\n");
2636                                 goto exit;
2637                         }
2638
2639                         tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2640                         if (tiocmget->urb) {
2641                                 mutex_init(&tiocmget->mutex);
2642                                 init_waitqueue_head(&tiocmget->waitq);
2643                         } else
2644                                 hso_free_tiomget(serial);
2645                 }
2646         }
2647         else
2648                 num_urbs = 1;
2649
2650         if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2651                                      BULK_URB_TX_SIZE))
2652                 goto exit;
2653
2654         serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2655                                      USB_DIR_IN);
2656         if (!serial->in_endp) {
2657                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2658                 goto exit2;
2659         }
2660
2661         if (!
2662             (serial->out_endp =
2663              hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2664                 dev_err(&interface->dev, "Failed to find BULK OUT ep\n");
2665                 goto exit2;
2666         }
2667
2668         serial->write_data = hso_std_serial_write_data;
2669
2670         /* and record this serial */
2671         set_serial_by_index(serial->minor, serial);
2672
2673         /* setup the proc dirs and files if needed */
2674         hso_log_port(hso_dev);
2675
2676         /* done, return it */
2677         return hso_dev;
2678
2679 exit2:
2680         hso_serial_tty_unregister(serial);
2681         hso_serial_common_free(serial);
2682 exit:
2683         hso_free_tiomget(serial);
2684         kfree(serial);
2685         kfree(hso_dev);
2686         return NULL;
2687 }
2688
2689 /* Creates a multiplexed AT channel */
2690 static
2691 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2692                                                 int port,
2693                                                 struct hso_shared_int *mux)
2694 {
2695         struct hso_device *hso_dev;
2696         struct hso_serial *serial;
2697         int port_spec;
2698
2699         port_spec = HSO_INTF_MUX;
2700         port_spec &= ~HSO_PORT_MASK;
2701
2702         port_spec |= hso_mux_to_port(port);
2703         if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2704                 return NULL;
2705
2706         hso_dev = hso_create_device(interface, port_spec);
2707         if (!hso_dev)
2708                 return NULL;
2709
2710         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2711         if (!serial)
2712                 goto exit;
2713
2714         hso_dev->port_data.dev_serial = serial;
2715         serial->parent = hso_dev;
2716
2717         if (hso_serial_common_create
2718             (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2719                 goto exit;
2720
2721         serial->tx_data_length--;
2722         serial->write_data = hso_mux_serial_write_data;
2723
2724         serial->shared_int = mux;
2725         mutex_lock(&serial->shared_int->shared_int_lock);
2726         serial->shared_int->ref_count++;
2727         mutex_unlock(&serial->shared_int->shared_int_lock);
2728
2729         /* and record this serial */
2730         set_serial_by_index(serial->minor, serial);
2731
2732         /* setup the proc dirs and files if needed */
2733         hso_log_port(hso_dev);
2734
2735         /* done, return it */
2736         return hso_dev;
2737
2738 exit:
2739         if (serial) {
2740                 tty_unregister_device(tty_drv, serial->minor);
2741                 kfree(serial);
2742         }
2743         kfree(hso_dev);
2744         return NULL;
2745
2746 }
2747
2748 static void hso_free_shared_int(struct hso_shared_int *mux)
2749 {
2750         usb_free_urb(mux->shared_intr_urb);
2751         kfree(mux->shared_intr_buf);
2752         mutex_unlock(&mux->shared_int_lock);
2753         kfree(mux);
2754 }
2755
2756 static
2757 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2758 {
2759         struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2760
2761         if (!mux)
2762                 return NULL;
2763
2764         mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2765                                     USB_DIR_IN);
2766         if (!mux->intr_endp) {
2767                 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2768                 goto exit;
2769         }
2770
2771         mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2772         if (!mux->shared_intr_urb)
2773                 goto exit;
2774         mux->shared_intr_buf =
2775                 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2776                         GFP_KERNEL);
2777         if (!mux->shared_intr_buf)
2778                 goto exit;
2779
2780         mutex_init(&mux->shared_int_lock);
2781
2782         return mux;
2783
2784 exit:
2785         kfree(mux->shared_intr_buf);
2786         usb_free_urb(mux->shared_intr_urb);
2787         kfree(mux);
2788         return NULL;
2789 }
2790
2791 /* Gets the port spec for a certain interface */
2792 static int hso_get_config_data(struct usb_interface *interface)
2793 {
2794         struct usb_device *usbdev = interface_to_usbdev(interface);
2795         u8 *config_data = kmalloc(17, GFP_KERNEL);
2796         u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2797         s32 result;
2798
2799         if (!config_data)
2800                 return -ENOMEM;
2801         if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2802                             0x86, 0xC0, 0, 0, config_data, 17,
2803                             USB_CTRL_SET_TIMEOUT) != 0x11) {
2804                 kfree(config_data);
2805                 return -EIO;
2806         }
2807
2808         /* check if we have a valid interface */
2809         if (if_num > 16) {
2810                 kfree(config_data);
2811                 return -EINVAL;
2812         }
2813
2814         switch (config_data[if_num]) {
2815         case 0x0:
2816                 result = 0;
2817                 break;
2818         case 0x1:
2819                 result = HSO_PORT_DIAG;
2820                 break;
2821         case 0x2:
2822                 result = HSO_PORT_GPS;
2823                 break;
2824         case 0x3:
2825                 result = HSO_PORT_GPS_CONTROL;
2826                 break;
2827         case 0x4:
2828                 result = HSO_PORT_APP;
2829                 break;
2830         case 0x5:
2831                 result = HSO_PORT_APP2;
2832                 break;
2833         case 0x6:
2834                 result = HSO_PORT_CONTROL;
2835                 break;
2836         case 0x7:
2837                 result = HSO_PORT_NETWORK;
2838                 break;
2839         case 0x8:
2840                 result = HSO_PORT_MODEM;
2841                 break;
2842         case 0x9:
2843                 result = HSO_PORT_MSD;
2844                 break;
2845         case 0xa:
2846                 result = HSO_PORT_PCSC;
2847                 break;
2848         case 0xb:
2849                 result = HSO_PORT_VOICE;
2850                 break;
2851         default:
2852                 result = 0;
2853         }
2854
2855         if (result)
2856                 result |= HSO_INTF_BULK;
2857
2858         if (config_data[16] & 0x1)
2859                 result |= HSO_INFO_CRC_BUG;
2860
2861         kfree(config_data);
2862         return result;
2863 }
2864
2865 /* called once for each interface upon device insertion */
2866 static int hso_probe(struct usb_interface *interface,
2867                      const struct usb_device_id *id)
2868 {
2869         int mux, i, if_num, port_spec;
2870         unsigned char port_mask;
2871         struct hso_device *hso_dev = NULL;
2872         struct hso_shared_int *shared_int;
2873         struct hso_device *tmp_dev = NULL;
2874
2875         if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2876                 dev_err(&interface->dev, "Not our interface\n");
2877                 return -ENODEV;
2878         }
2879
2880         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2881
2882         /* Get the interface/port specification from either driver_info or from
2883          * the device itself */
2884         if (id->driver_info) {
2885                 /* if_num is controlled by the device, driver_info is a 0 terminated
2886                  * array. Make sure, the access is in bounds! */
2887                 for (i = 0; i <= if_num; ++i)
2888                         if (((u32 *)(id->driver_info))[i] == 0)
2889                                 goto exit;
2890                 port_spec = ((u32 *)(id->driver_info))[if_num];
2891         } else {
2892                 port_spec = hso_get_config_data(interface);
2893                 if (port_spec < 0)
2894                         goto exit;
2895         }
2896
2897         /* Check if we need to switch to alt interfaces prior to port
2898          * configuration */
2899         if (interface->num_altsetting > 1)
2900                 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2901         interface->needs_remote_wakeup = 1;
2902
2903         /* Allocate new hso device(s) */
2904         switch (port_spec & HSO_INTF_MASK) {
2905         case HSO_INTF_MUX:
2906                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2907                         /* Create the network device */
2908                         if (!disable_net) {
2909                                 hso_dev = hso_create_net_device(interface,
2910                                                                 port_spec);
2911                                 if (!hso_dev)
2912                                         goto exit;
2913                                 tmp_dev = hso_dev;
2914                         }
2915                 }
2916
2917                 if (hso_get_mux_ports(interface, &port_mask))
2918                         /* TODO: de-allocate everything */
2919                         goto exit;
2920
2921                 shared_int = hso_create_shared_int(interface);
2922                 if (!shared_int)
2923                         goto exit;
2924
2925                 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2926                         if (port_mask & i) {
2927                                 hso_dev = hso_create_mux_serial_device(
2928                                                 interface, i, shared_int);
2929                                 if (!hso_dev)
2930                                         goto exit;
2931                         }
2932                 }
2933
2934                 if (tmp_dev)
2935                         hso_dev = tmp_dev;
2936                 break;
2937
2938         case HSO_INTF_BULK:
2939                 /* It's a regular bulk interface */
2940                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2941                         if (!disable_net)
2942                                 hso_dev =
2943                                     hso_create_net_device(interface, port_spec);
2944                 } else {
2945                         hso_dev =
2946                             hso_create_bulk_serial_device(interface, port_spec);
2947                 }
2948                 if (!hso_dev)
2949                         goto exit;
2950                 break;
2951         default:
2952                 goto exit;
2953         }
2954
2955         /* save our data pointer in this device */
2956         usb_set_intfdata(interface, hso_dev);
2957
2958         /* done */
2959         return 0;
2960 exit:
2961         hso_free_interface(interface);
2962         return -ENODEV;
2963 }
2964
2965 /* device removed, cleaning up */
2966 static void hso_disconnect(struct usb_interface *interface)
2967 {
2968         hso_free_interface(interface);
2969
2970         /* remove reference of our private data */
2971         usb_set_intfdata(interface, NULL);
2972 }
2973
2974 static void async_get_intf(struct work_struct *data)
2975 {
2976         struct hso_device *hso_dev =
2977             container_of(data, struct hso_device, async_get_intf);
2978         usb_autopm_get_interface(hso_dev->interface);
2979 }
2980
2981 static void async_put_intf(struct work_struct *data)
2982 {
2983         struct hso_device *hso_dev =
2984             container_of(data, struct hso_device, async_put_intf);
2985         usb_autopm_put_interface(hso_dev->interface);
2986 }
2987
2988 static int hso_get_activity(struct hso_device *hso_dev)
2989 {
2990         if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2991                 if (!hso_dev->is_active) {
2992                         hso_dev->is_active = 1;
2993                         schedule_work(&hso_dev->async_get_intf);
2994                 }
2995         }
2996
2997         if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2998                 return -EAGAIN;
2999
3000         usb_mark_last_busy(hso_dev->usb);
3001
3002         return 0;
3003 }
3004
3005 static int hso_put_activity(struct hso_device *hso_dev)
3006 {
3007         if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
3008                 if (hso_dev->is_active) {
3009                         hso_dev->is_active = 0;
3010                         schedule_work(&hso_dev->async_put_intf);
3011                         return -EAGAIN;
3012                 }
3013         }
3014         hso_dev->is_active = 0;
3015         return 0;
3016 }
3017
3018 /* called by kernel when we need to suspend device */
3019 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3020 {
3021         int i, result;
3022
3023         /* Stop all serial ports */
3024         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3025                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3026                         result = hso_stop_serial_device(serial_table[i]);
3027                         if (result)
3028                                 goto out;
3029                 }
3030         }
3031
3032         /* Stop all network ports */
3033         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3034                 if (network_table[i] &&
3035                     (network_table[i]->interface == iface)) {
3036                         result = hso_stop_net_device(network_table[i]);
3037                         if (result)
3038                                 goto out;
3039                 }
3040         }
3041
3042 out:
3043         return 0;
3044 }
3045
3046 /* called by kernel when we need to resume device */
3047 static int hso_resume(struct usb_interface *iface)
3048 {
3049         int i, result = 0;
3050         struct hso_net *hso_net;
3051
3052         /* Start all serial ports */
3053         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3054                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3055                         if (dev2ser(serial_table[i])->port.count) {
3056                                 result =
3057                                     hso_start_serial_device(serial_table[i], GFP_NOIO);
3058                                 hso_kick_transmit(dev2ser(serial_table[i]));
3059                                 if (result)
3060                                         goto out;
3061                         }
3062                 }
3063         }
3064
3065         /* Start all network ports */
3066         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3067                 if (network_table[i] &&
3068                     (network_table[i]->interface == iface)) {
3069                         hso_net = dev2net(network_table[i]);
3070                         if (hso_net->flags & IFF_UP) {
3071                                 /* First transmit any lingering data,
3072                                    then restart the device. */
3073                                 if (hso_net->skb_tx_buf) {
3074                                         dev_dbg(&iface->dev,
3075                                                 "Transmitting"
3076                                                 " lingering data\n");
3077                                         hso_net_start_xmit(hso_net->skb_tx_buf,
3078                                                            hso_net->net);
3079                                         hso_net->skb_tx_buf = NULL;
3080                                 }
3081                                 result = hso_start_net_device(network_table[i]);
3082                                 if (result)
3083                                         goto out;
3084                         }
3085                 }
3086         }
3087
3088 out:
3089         return result;
3090 }
3091
3092 static void hso_serial_ref_free(struct kref *ref)
3093 {
3094         struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3095
3096         hso_free_serial_device(hso_dev);
3097 }
3098
3099 static void hso_free_interface(struct usb_interface *interface)
3100 {
3101         struct hso_serial *serial;
3102         int i;
3103
3104         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3105                 if (serial_table[i] &&
3106                     (serial_table[i]->interface == interface)) {
3107                         serial = dev2ser(serial_table[i]);
3108                         tty_port_tty_hangup(&serial->port, false);
3109                         mutex_lock(&serial->parent->mutex);
3110                         serial->parent->usb_gone = 1;
3111                         mutex_unlock(&serial->parent->mutex);
3112                         cancel_work_sync(&serial_table[i]->async_put_intf);
3113                         cancel_work_sync(&serial_table[i]->async_get_intf);
3114                         hso_serial_tty_unregister(serial);
3115                         kref_put(&serial_table[i]->ref, hso_serial_ref_free);
3116                         set_serial_by_index(i, NULL);
3117                 }
3118         }
3119
3120         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3121                 if (network_table[i] &&
3122                     (network_table[i]->interface == interface)) {
3123                         struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3124                         /* hso_stop_net_device doesn't stop the net queue since
3125                          * traffic needs to start it again when suspended */
3126                         netif_stop_queue(dev2net(network_table[i])->net);
3127                         hso_stop_net_device(network_table[i]);
3128                         cancel_work_sync(&network_table[i]->async_put_intf);
3129                         cancel_work_sync(&network_table[i]->async_get_intf);
3130                         if (rfk) {
3131                                 rfkill_unregister(rfk);
3132                                 rfkill_destroy(rfk);
3133                         }
3134                         hso_free_net_device(network_table[i], false);
3135                 }
3136         }
3137 }
3138
3139 /* Helper functions */
3140
3141 /* Get the endpoint ! */
3142 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3143                                                   int type, int dir)
3144 {
3145         int i;
3146         struct usb_host_interface *iface = intf->cur_altsetting;
3147         struct usb_endpoint_descriptor *endp;
3148
3149         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3150                 endp = &iface->endpoint[i].desc;
3151                 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3152                     (usb_endpoint_type(endp) == type))
3153                         return endp;
3154         }
3155
3156         return NULL;
3157 }
3158
3159 /* Get the byte that describes which ports are enabled */
3160 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3161 {
3162         int i;
3163         struct usb_host_interface *iface = intf->cur_altsetting;
3164
3165         if (iface->extralen == 3) {
3166                 *ports = iface->extra[2];
3167                 return 0;
3168         }
3169
3170         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3171                 if (iface->endpoint[i].extralen == 3) {
3172                         *ports = iface->endpoint[i].extra[2];
3173                         return 0;
3174                 }
3175         }
3176
3177         return -1;
3178 }
3179
3180 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3181 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3182                                    struct usb_device *usb, gfp_t gfp)
3183 {
3184         int result;
3185
3186         usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3187                          usb_rcvintpipe(usb,
3188                                 shared_int->intr_endp->bEndpointAddress & 0x7F),
3189                          shared_int->shared_intr_buf,
3190                          1,
3191                          intr_callback, shared_int,
3192                          shared_int->intr_endp->bInterval);
3193
3194         result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3195         if (result)
3196                 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3197                         result);
3198
3199         return result;
3200 }
3201
3202 /* operations setup of the serial interface */
3203 static const struct tty_operations hso_serial_ops = {
3204         .open = hso_serial_open,
3205         .close = hso_serial_close,
3206         .write = hso_serial_write,
3207         .write_room = hso_serial_write_room,
3208         .cleanup = hso_serial_cleanup,
3209         .ioctl = hso_serial_ioctl,
3210         .set_termios = hso_serial_set_termios,
3211         .chars_in_buffer = hso_serial_chars_in_buffer,
3212         .tiocmget = hso_serial_tiocmget,
3213         .tiocmset = hso_serial_tiocmset,
3214         .get_icount = hso_get_count,
3215         .unthrottle = hso_unthrottle
3216 };
3217
3218 static struct usb_driver hso_driver = {
3219         .name = driver_name,
3220         .probe = hso_probe,
3221         .disconnect = hso_disconnect,
3222         .id_table = hso_ids,
3223         .suspend = hso_suspend,
3224         .resume = hso_resume,
3225         .reset_resume = hso_resume,
3226         .supports_autosuspend = 1,
3227         .disable_hub_initiated_lpm = 1,
3228 };
3229
3230 static int __init hso_init(void)
3231 {
3232         int i;
3233         int result;
3234
3235         /* put it in the log */
3236         pr_info("%s\n", version);
3237
3238         /* Initialise the serial table semaphore and table */
3239         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3240                 serial_table[i] = NULL;
3241
3242         /* allocate our driver using the proper amount of supported minors */
3243         tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3244         if (!tty_drv)
3245                 return -ENOMEM;
3246
3247         /* fill in all needed values */
3248         tty_drv->driver_name = driver_name;
3249         tty_drv->name = tty_filename;
3250
3251         /* if major number is provided as parameter, use that one */
3252         if (tty_major)
3253                 tty_drv->major = tty_major;
3254
3255         tty_drv->minor_start = 0;
3256         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3257         tty_drv->subtype = SERIAL_TYPE_NORMAL;
3258         tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3259         tty_drv->init_termios = tty_std_termios;
3260         hso_init_termios(&tty_drv->init_termios);
3261         tty_set_operations(tty_drv, &hso_serial_ops);
3262
3263         /* register the tty driver */
3264         result = tty_register_driver(tty_drv);
3265         if (result) {
3266                 pr_err("%s - tty_register_driver failed(%d)\n",
3267                        __func__, result);
3268                 goto err_free_tty;
3269         }
3270
3271         /* register this module as an usb driver */
3272         result = usb_register(&hso_driver);
3273         if (result) {
3274                 pr_err("Could not register hso driver - error: %d\n", result);
3275                 goto err_unreg_tty;
3276         }
3277
3278         /* done */
3279         return 0;
3280 err_unreg_tty:
3281         tty_unregister_driver(tty_drv);
3282 err_free_tty:
3283         put_tty_driver(tty_drv);
3284         return result;
3285 }
3286
3287 static void __exit hso_exit(void)
3288 {
3289         pr_info("unloaded\n");
3290
3291         tty_unregister_driver(tty_drv);
3292         /* deregister the usb driver */
3293         usb_deregister(&hso_driver);
3294         put_tty_driver(tty_drv);
3295 }
3296
3297 /* Module definitions */
3298 module_init(hso_init);
3299 module_exit(hso_exit);
3300
3301 MODULE_AUTHOR(MOD_AUTHOR);
3302 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3303 MODULE_LICENSE("GPL");
3304
3305 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3306 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3307 module_param(debug, int, 0644);
3308
3309 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3310 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3311 module_param(tty_major, int, 0644);
3312
3313 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3314 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3315 module_param(disable_net, int, 0644);