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 hsotype_show(struct device *dev,
 461                             struct device_attribute *attr, char *buf)
 462 {
 463         struct hso_device *hso_dev = dev_get_drvdata(dev);
 464         char *port_name;
 465
 466         if (!hso_dev)
 467                 return 0;
 468
 469         switch (hso_dev->port_spec & HSO_PORT_MASK) {
 470         case HSO_PORT_CONTROL:
 471                 port_name = "Control";
 472                 break;
 473         case HSO_PORT_APP:
 474                 port_name = "Application";
 475                 break;
 476         case HSO_PORT_APP2:
 477                 port_name = "Application2";
 478                 break;
 479         case HSO_PORT_GPS:
 480                 port_name = "GPS";
 481                 break;
 482         case HSO_PORT_GPS_CONTROL:
 483                 port_name = "GPS Control";
 484                 break;
 485         case HSO_PORT_PCSC:
 486                 port_name = "PCSC";
 487                 break;
 488         case HSO_PORT_DIAG:
 489                 port_name = "Diagnostic";
 490                 break;
 491         case HSO_PORT_DIAG2:
 492                 port_name = "Diagnostic2";
 493                 break;
 494         case HSO_PORT_MODEM:
 495                 port_name = "Modem";
 496                 break;
 497         case HSO_PORT_NETWORK:
 498                 port_name = "Network";
 499                 break;
 500         default:
 501                 port_name = "Unknown";
 502                 break;
 503         }
 504
 505         return sprintf(buf, "%s\n", port_name);
 506 }
 507 static DEVICE_ATTR_RO(hsotype);
 508
 509 static struct attribute *hso_serial_dev_attrs[] = {
 510         &dev_attr_hsotype.attr,
 511         NULL
 512 };
 513
 514 ATTRIBUTE_GROUPS(hso_serial_dev);
 515
 516 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
 517 {
 518         int idx;
 519
 520         for (idx = 0; idx < serial->num_rx_urbs; idx++)
 521                 if (serial->rx_urb[idx] == urb)
 522                         return idx;
 523         dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
 524         return -1;
 525 }
 526
 527 /* converts mux value to a port spec value */
 528 static u32 hso_mux_to_port(int mux)
 529 {
 530         u32 result;
 531
 532         switch (mux) {
 533         case 0x1:
 534                 result = HSO_PORT_CONTROL;
 535                 break;
 536         case 0x2:
 537                 result = HSO_PORT_APP;
 538                 break;
 539         case 0x4:
 540                 result = HSO_PORT_PCSC;
 541                 break;
 542         case 0x8:
 543                 result = HSO_PORT_GPS;
 544                 break;
 545         case 0x10:
 546                 result = HSO_PORT_APP2;
 547                 break;
 548         default:
 549                 result = HSO_PORT_NO_PORT;
 550         }
 551         return result;
 552 }
 553
 554 /* converts port spec value to a mux value */
 555 static u32 hso_port_to_mux(int port)
 556 {
 557         u32 result;
 558
 559         switch (port & HSO_PORT_MASK) {
 560         case HSO_PORT_CONTROL:
 561                 result = 0x0;
 562                 break;
 563         case HSO_PORT_APP:
 564                 result = 0x1;
 565                 break;
 566         case HSO_PORT_PCSC:
 567                 result = 0x2;
 568                 break;
 569         case HSO_PORT_GPS:
 570                 result = 0x3;
 571                 break;
 572         case HSO_PORT_APP2:
 573                 result = 0x4;
 574                 break;
 575         default:
 576                 result = 0x0;
 577         }
 578         return result;
 579 }
 580
 581 static struct hso_serial *get_serial_by_shared_int_and_type(
 582                                         struct hso_shared_int *shared_int,
 583                                         int mux)
 584 {
 585         int i, port;
 586
 587         port = hso_mux_to_port(mux);
 588
 589         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
 590                 if (serial_table[i] &&
 591                     (dev2ser(serial_table[i])->shared_int == shared_int) &&
 592                     ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
 593                         return dev2ser(serial_table[i]);
 594                 }
 595         }
 596
 597         return NULL;
 598 }
 599
 600 static struct hso_serial *get_serial_by_index(unsigned index)
 601 {
 602         struct hso_serial *serial = NULL;
 603         unsigned long flags;
 604
 605         spin_lock_irqsave(&serial_table_lock, flags);
 606         if (serial_table[index])
 607                 serial = dev2ser(serial_table[index]);
 608         spin_unlock_irqrestore(&serial_table_lock, flags);
 609
 610         return serial;
 611 }
 612
 613 static int obtain_minor(struct hso_serial *serial)
 614 {
 615         int index;
 616         unsigned long flags;
 617
 618         spin_lock_irqsave(&serial_table_lock, flags);
 619         for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
 620                 if (serial_table[index] == NULL) {
 621                         serial_table[index] = serial->parent;
 622                         serial->minor = index;
 623                         spin_unlock_irqrestore(&serial_table_lock, flags);
 624                         return 0;
 625                 }
 626         }
 627         spin_unlock_irqrestore(&serial_table_lock, flags);
 628
 629         pr_err("%s: no free serial devices in table\n", __func__);
 630         return -1;
 631 }
 632
 633 static void release_minor(struct hso_serial *serial)
 634 {
 635         unsigned long flags;
 636
 637         spin_lock_irqsave(&serial_table_lock, flags);
 638         serial_table[serial->minor] = NULL;
 639         spin_unlock_irqrestore(&serial_table_lock, flags);
 640 }
 641
 642 static void handle_usb_error(int status, const char *function,
 643                              struct hso_device *hso_dev)
 644 {
 645         char *explanation;
 646
 647         switch (status) {
 648         case -ENODEV:
 649                 explanation = "no device";
 650                 break;
 651         case -ENOENT:
 652                 explanation = "endpoint not enabled";
 653                 break;
 654         case -EPIPE:
 655                 explanation = "endpoint stalled";
 656                 break;
 657         case -ENOSPC:
 658                 explanation = "not enough bandwidth";
 659                 break;
 660         case -ESHUTDOWN:
 661                 explanation = "device disabled";
 662                 break;
 663         case -EHOSTUNREACH:
 664                 explanation = "device suspended";
 665                 break;
 666         case -EINVAL:
 667         case -EAGAIN:
 668         case -EFBIG:
 669         case -EMSGSIZE:
 670                 explanation = "internal error";
 671                 break;
 672         case -EILSEQ:
 673         case -EPROTO:
 674         case -ETIME:
 675         case -ETIMEDOUT:
 676                 explanation = "protocol error";
 677                 if (hso_dev)
 678                         usb_queue_reset_device(hso_dev->interface);
 679                 break;
 680         default:
 681                 explanation = "unknown status";
 682                 break;
 683         }
 684
 685         /* log a meaningful explanation of an USB status */
 686         hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
 687                 function, explanation, status);
 688 }
 689
 690 /* Network interface functions */
 691
 692 /* called when net interface is brought up by ifconfig */
 693 static int hso_net_open(struct net_device *net)
 694 {
 695         struct hso_net *odev = netdev_priv(net);
 696         unsigned long flags = 0;
 697
 698         if (!odev) {
 699                 dev_err(&net->dev, "No net device !\n");
 700                 return -ENODEV;
 701         }
 702
 703         odev->skb_tx_buf = NULL;
 704
 705         /* setup environment */
 706         spin_lock_irqsave(&odev->net_lock, flags);
 707         odev->rx_parse_state = WAIT_IP;
 708         odev->rx_buf_size = 0;
 709         odev->rx_buf_missing = sizeof(struct iphdr);
 710         spin_unlock_irqrestore(&odev->net_lock, flags);
 711
 712         /* We are up and running. */
 713         set_bit(HSO_NET_RUNNING, &odev->flags);
 714         hso_start_net_device(odev->parent);
 715
 716         /* Tell the kernel we are ready to start receiving from it */
 717         netif_start_queue(net);
 718
 719         return 0;
 720 }
 721
 722 /* called when interface is brought down by ifconfig */
 723 static int hso_net_close(struct net_device *net)
 724 {
 725         struct hso_net *odev = netdev_priv(net);
 726
 727         /* we don't need the queue anymore */
 728         netif_stop_queue(net);
 729         /* no longer running */
 730         clear_bit(HSO_NET_RUNNING, &odev->flags);
 731
 732         hso_stop_net_device(odev->parent);
 733
 734         /* done */
 735         return 0;
 736 }
 737
 738 /* USB tells is xmit done, we should start the netqueue again */
 739 static void write_bulk_callback(struct urb *urb)
 740 {
 741         struct hso_net *odev = urb->context;
 742         int status = urb->status;
 743
 744         /* Sanity check */
 745         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 746                 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
 747                 return;
 748         }
 749
 750         /* Do we still have a valid kernel network device? */
 751         if (!netif_device_present(odev->net)) {
 752                 dev_err(&urb->dev->dev, "%s: net device not present\n",
 753                         __func__);
 754                 return;
 755         }
 756
 757         /* log status, but don't act on it, we don't need to resubmit anything
 758          * anyhow */
 759         if (status)
 760                 handle_usb_error(status, __func__, odev->parent);
 761
 762         hso_put_activity(odev->parent);
 763
 764         /* Tell the network interface we are ready for another frame */
 765         netif_wake_queue(odev->net);
 766 }
 767
 768 /* called by kernel when we need to transmit a packet */
 769 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
 770                                             struct net_device *net)
 771 {
 772         struct hso_net *odev = netdev_priv(net);
 773         int result;
 774
 775         /* Tell the kernel, "No more frames 'til we are done with this one." */
 776         netif_stop_queue(net);
 777         if (hso_get_activity(odev->parent) == -EAGAIN) {
 778                 odev->skb_tx_buf = skb;
 779                 return NETDEV_TX_OK;
 780         }
 781
 782         /* log if asked */
 783         DUMP1(skb->data, skb->len);
 784         /* Copy it from kernel memory to OUR memory */
 785         memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
 786         hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
 787
 788         /* Fill in the URB for shipping it out. */
 789         usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
 790                           odev->parent->usb,
 791                           usb_sndbulkpipe(odev->parent->usb,
 792                                           odev->out_endp->
 793                                           bEndpointAddress & 0x7F),
 794                           odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
 795                           odev);
 796
 797         /* Deal with the Zero Length packet problem, I hope */
 798         odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
 799
 800         /* Send the URB on its merry way. */
 801         result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
 802         if (result) {
 803                 dev_warn(&odev->parent->interface->dev,
 804                         "failed mux_bulk_tx_urb %d\n", result);
 805                 net->stats.tx_errors++;
 806                 netif_start_queue(net);
 807         } else {
 808                 net->stats.tx_packets++;
 809                 net->stats.tx_bytes += skb->len;
 810         }
 811         dev_kfree_skb(skb);
 812         /* we're done */
 813         return NETDEV_TX_OK;
 814 }
 815
 816 static const struct ethtool_ops ops = {
 817         .get_link = ethtool_op_get_link
 818 };
 819
 820 /* called when a packet did not ack after watchdogtimeout */
 821 static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
 822 {
 823         struct hso_net *odev = netdev_priv(net);
 824
 825         if (!odev)
 826                 return;
 827
 828         /* Tell syslog we are hosed. */
 829         dev_warn(&net->dev, "Tx timed out.\n");
 830
 831         /* Tear the waiting frame off the list */
 832         if (odev->mux_bulk_tx_urb)
 833                 usb_unlink_urb(odev->mux_bulk_tx_urb);
 834
 835         /* Update statistics */
 836         net->stats.tx_errors++;
 837 }
 838
 839 /* make a real packet from the received USB buffer */
 840 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
 841                         unsigned int count, unsigned char is_eop)
 842 {
 843         unsigned short temp_bytes;
 844         unsigned short buffer_offset = 0;
 845         unsigned short frame_len;
 846
 847         /* log if needed */
 848         hso_dbg(0x1, "Rx %d bytes\n", count);
 849         DUMP(ip_pkt, min(128, (int)count));
 850
 851         while (count) {
 852                 switch (odev->rx_parse_state) {
 853                 case WAIT_IP:
 854                         /* waiting for IP header. */
 855                         /* wanted bytes - size of ip header */
 856                         temp_bytes =
 857                             (count <
 858                              odev->rx_buf_missing) ? count : odev->
 859                             rx_buf_missing;
 860
 861                         memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
 862                                odev->rx_buf_size, ip_pkt + buffer_offset,
 863                                temp_bytes);
 864
 865                         odev->rx_buf_size += temp_bytes;
 866                         buffer_offset += temp_bytes;
 867                         odev->rx_buf_missing -= temp_bytes;
 868                         count -= temp_bytes;
 869
 870                         if (!odev->rx_buf_missing) {
 871                                 /* header is complete allocate an sk_buffer and
 872                                  * continue to WAIT_DATA */
 873                                 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
 874
 875                                 if ((frame_len > DEFAULT_MRU) ||
 876                                     (frame_len < sizeof(struct iphdr))) {
 877                                         dev_err(&odev->net->dev,
 878                                                 "Invalid frame (%d) length\n",
 879                                                 frame_len);
 880                                         odev->rx_parse_state = WAIT_SYNC;
 881                                         continue;
 882                                 }
 883                                 /* Allocate an sk_buff */
 884                                 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
 885                                                                     frame_len);
 886                                 if (!odev->skb_rx_buf) {
 887                                         /* We got no receive buffer. */
 888                                         hso_dbg(0x1, "could not allocate memory\n");
 889                                         odev->rx_parse_state = WAIT_SYNC;
 890                                         continue;
 891                                 }
 892
 893                                 /* Copy what we got so far. make room for iphdr
 894                                  * after tail. */
 895                                 skb_put_data(odev->skb_rx_buf,
 896                                              (char *)&(odev->rx_ip_hdr),
 897                                              sizeof(struct iphdr));
 898
 899                                 /* ETH_HLEN */
 900                                 odev->rx_buf_size = sizeof(struct iphdr);
 901
 902                                 /* Filip actually use .tot_len */
 903                                 odev->rx_buf_missing =
 904                                     frame_len - sizeof(struct iphdr);
 905                                 odev->rx_parse_state = WAIT_DATA;
 906                         }
 907                         break;
 908
 909                 case WAIT_DATA:
 910                         temp_bytes = (count < odev->rx_buf_missing)
 911                                         ? count : odev->rx_buf_missing;
 912
 913                         /* Copy the rest of the bytes that are left in the
 914                          * buffer into the waiting sk_buf. */
 915                         /* Make room for temp_bytes after tail. */
 916                         skb_put_data(odev->skb_rx_buf,
 917                                      ip_pkt + buffer_offset,
 918                                      temp_bytes);
 919
 920                         odev->rx_buf_missing -= temp_bytes;
 921                         count -= temp_bytes;
 922                         buffer_offset += temp_bytes;
 923                         odev->rx_buf_size += temp_bytes;
 924                         if (!odev->rx_buf_missing) {
 925                                 /* Packet is complete. Inject into stack. */
 926                                 /* We have IP packet here */
 927                                 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
 928                                 skb_reset_mac_header(odev->skb_rx_buf);
 929
 930                                 /* Ship it off to the kernel */
 931                                 netif_rx(odev->skb_rx_buf);
 932                                 /* No longer our buffer. */
 933                                 odev->skb_rx_buf = NULL;
 934
 935                                 /* update out statistics */
 936                                 odev->net->stats.rx_packets++;
 937
 938                                 odev->net->stats.rx_bytes += odev->rx_buf_size;
 939
 940                                 odev->rx_buf_size = 0;
 941                                 odev->rx_buf_missing = sizeof(struct iphdr);
 942                                 odev->rx_parse_state = WAIT_IP;
 943                         }
 944                         break;
 945
 946                 case WAIT_SYNC:
 947                         hso_dbg(0x1, " W_S\n");
 948                         count = 0;
 949                         break;
 950                 default:
 951                         hso_dbg(0x1, "\n");
 952                         count--;
 953                         break;
 954                 }
 955         }
 956
 957         /* Recovery mechanism for WAIT_SYNC state. */
 958         if (is_eop) {
 959                 if (odev->rx_parse_state == WAIT_SYNC) {
 960                         odev->rx_parse_state = WAIT_IP;
 961                         odev->rx_buf_size = 0;
 962                         odev->rx_buf_missing = sizeof(struct iphdr);
 963                 }
 964         }
 965 }
 966
 967 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
 968 {
 969         static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
 970         u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
 971
 972         if (((rest == 5) || (rest == 6)) &&
 973             !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
 974                     crc_check, 4)) {
 975                 urb->actual_length -= 4;
 976         }
 977 }
 978
 979 /* Moving data from usb to kernel (in interrupt state) */
 980 static void read_bulk_callback(struct urb *urb)
 981 {
 982         struct hso_net *odev = urb->context;
 983         struct net_device *net;
 984         int result;
 985         unsigned long flags;
 986         int status = urb->status;
 987
 988         /* is al ok?  (Filip: Who's Al ?) */
 989         if (status) {
 990                 handle_usb_error(status, __func__, odev->parent);
 991                 return;
 992         }
 993
 994         /* Sanity check */
 995         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 996                 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
 997                 return;
 998         }
 999         usb_mark_last_busy(urb->dev);
1000
1001         net = odev->net;
1002
1003         if (!netif_device_present(net)) {
1004                 /* Somebody killed our network interface... */
1005                 return;
1006         }
1007
1008         if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1009                 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1010
1011         /* do we even have a packet? */
1012         if (urb->actual_length) {
1013                 /* Handle the IP stream, add header and push it onto network
1014                  * stack if the packet is complete. */
1015                 spin_lock_irqsave(&odev->net_lock, flags);
1016                 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1017                             (urb->transfer_buffer_length >
1018                              urb->actual_length) ? 1 : 0);
1019                 spin_unlock_irqrestore(&odev->net_lock, flags);
1020         }
1021
1022         /* We are done with this URB, resubmit it. Prep the USB to wait for
1023          * another frame. Reuse same as received. */
1024         usb_fill_bulk_urb(urb,
1025                           odev->parent->usb,
1026                           usb_rcvbulkpipe(odev->parent->usb,
1027                                           odev->in_endp->
1028                                           bEndpointAddress & 0x7F),
1029                           urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1030                           read_bulk_callback, odev);
1031
1032         /* Give this to the USB subsystem so it can tell us when more data
1033          * arrives. */
1034         result = usb_submit_urb(urb, GFP_ATOMIC);
1035         if (result)
1036                 dev_warn(&odev->parent->interface->dev,
1037                          "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1038                          result);
1039 }
1040
1041 /* Serial driver functions */
1042
1043 static void hso_init_termios(struct ktermios *termios)
1044 {
1045         /*
1046          * The default requirements for this device are:
1047          */
1048         termios->c_iflag &=
1049                 ~(IGNBRK        /* disable ignore break */
1050                 | BRKINT        /* disable break causes interrupt */
1051                 | PARMRK        /* disable mark parity errors */
1052                 | ISTRIP        /* disable clear high bit of input characters */
1053                 | INLCR         /* disable translate NL to CR */
1054                 | IGNCR         /* disable ignore CR */
1055                 | ICRNL         /* disable translate CR to NL */
1056                 | IXON);        /* disable enable XON/XOFF flow control */
1057
1058         /* disable postprocess output characters */
1059         termios->c_oflag &= ~OPOST;
1060
1061         termios->c_lflag &=
1062                 ~(ECHO          /* disable echo input characters */
1063                 | ECHONL        /* disable echo new line */
1064                 | ICANON        /* disable erase, kill, werase, and rprnt
1065                                    special characters */
1066                 | ISIG          /* disable interrupt, quit, and suspend special
1067                                    characters */
1068                 | IEXTEN);      /* disable non-POSIX special characters */
1069
1070         termios->c_cflag &=
1071                 ~(CSIZE         /* no size */
1072                 | PARENB        /* disable parity bit */
1073                 | CBAUD         /* clear current baud rate */
1074                 | CBAUDEX);     /* clear current buad rate */
1075
1076         termios->c_cflag |= CS8;        /* character size 8 bits */
1077
1078         /* baud rate 115200 */
1079         tty_termios_encode_baud_rate(termios, 115200, 115200);
1080 }
1081
1082 static void _hso_serial_set_termios(struct tty_struct *tty)
1083 {
1084         struct hso_serial *serial = tty->driver_data;
1085
1086         if (!serial) {
1087                 pr_err("%s: no tty structures", __func__);
1088                 return;
1089         }
1090
1091         hso_dbg(0x8, "port %d\n", serial->minor);
1092
1093         /*
1094          *      Fix up unsupported bits
1095          */
1096         tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1097
1098         tty->termios.c_cflag &=
1099                 ~(CSIZE         /* no size */
1100                 | PARENB        /* disable parity bit */
1101                 | CBAUD         /* clear current baud rate */
1102                 | CBAUDEX);     /* clear current buad rate */
1103
1104         tty->termios.c_cflag |= CS8;    /* character size 8 bits */
1105
1106         /* baud rate 115200 */
1107         tty_encode_baud_rate(tty, 115200, 115200);
1108 }
1109
1110 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1111 {
1112         int result;
1113         /* We are done with this URB, resubmit it. Prep the USB to wait for
1114          * another frame */
1115         usb_fill_bulk_urb(urb, serial->parent->usb,
1116                           usb_rcvbulkpipe(serial->parent->usb,
1117                                           serial->in_endp->
1118                                           bEndpointAddress & 0x7F),
1119                           urb->transfer_buffer, serial->rx_data_length,
1120                           hso_std_serial_read_bulk_callback, serial);
1121         /* Give this to the USB subsystem so it can tell us when more data
1122          * arrives. */
1123         result = usb_submit_urb(urb, GFP_ATOMIC);
1124         if (result) {
1125                 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1126                         __func__, result);
1127         }
1128 }
1129
1130
1131
1132
1133 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1134 {
1135         int count;
1136         struct urb *curr_urb;
1137
1138         while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1139                 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1140                 count = put_rxbuf_data(curr_urb, serial);
1141                 if (count == -1)
1142                         return;
1143                 if (count == 0) {
1144                         serial->curr_rx_urb_idx++;
1145                         if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1146                                 serial->curr_rx_urb_idx = 0;
1147                         hso_resubmit_rx_bulk_urb(serial, curr_urb);
1148                 }
1149         }
1150 }
1151
1152 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1153 {
1154         int count = 0;
1155         struct urb *urb;
1156
1157         urb = serial->rx_urb[0];
1158         if (serial->port.count > 0) {
1159                 count = put_rxbuf_data(urb, serial);
1160                 if (count == -1)
1161                         return;
1162         }
1163         /* Re issue a read as long as we receive data. */
1164
1165         if (count == 0 && ((urb->actual_length != 0) ||
1166                            (serial->rx_state == RX_PENDING))) {
1167                 serial->rx_state = RX_SENT;
1168                 hso_mux_serial_read(serial);
1169         } else
1170                 serial->rx_state = RX_IDLE;
1171 }
1172
1173
1174 /* read callback for Diag and CS port */
1175 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1176 {
1177         struct hso_serial *serial = urb->context;
1178         int status = urb->status;
1179         unsigned long flags;
1180
1181         hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1182
1183         /* sanity check */
1184         if (!serial) {
1185                 hso_dbg(0x1, "serial == NULL\n");
1186                 return;
1187         }
1188         if (status) {
1189                 handle_usb_error(status, __func__, serial->parent);
1190                 return;
1191         }
1192
1193         hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1194         DUMP1(urb->transfer_buffer, urb->actual_length);
1195
1196         /* Anyone listening? */
1197         if (serial->port.count == 0)
1198                 return;
1199
1200         if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1201                 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1202         /* Valid data, handle RX data */
1203         spin_lock_irqsave(&serial->serial_lock, flags);
1204         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1205         put_rxbuf_data_and_resubmit_bulk_urb(serial);
1206         spin_unlock_irqrestore(&serial->serial_lock, flags);
1207 }
1208
1209 /*
1210  * This needs to be a tasklet otherwise we will
1211  * end up recursively calling this function.
1212  */
1213 static void hso_unthrottle_tasklet(struct tasklet_struct *t)
1214 {
1215         struct hso_serial *serial = from_tasklet(serial, t,
1216                                                  unthrottle_tasklet);
1217         unsigned long flags;
1218
1219         spin_lock_irqsave(&serial->serial_lock, flags);
1220         if ((serial->parent->port_spec & HSO_INTF_MUX))
1221                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1222         else
1223                 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1224         spin_unlock_irqrestore(&serial->serial_lock, flags);
1225 }
1226
1227 static  void hso_unthrottle(struct tty_struct *tty)
1228 {
1229         struct hso_serial *serial = tty->driver_data;
1230
1231         tasklet_hi_schedule(&serial->unthrottle_tasklet);
1232 }
1233
1234 /* open the requested serial port */
1235 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1236 {
1237         struct hso_serial *serial = get_serial_by_index(tty->index);
1238         int result;
1239
1240         /* sanity check */
1241         if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1242                 WARN_ON(1);
1243                 tty->driver_data = NULL;
1244                 hso_dbg(0x1, "Failed to open port\n");
1245                 return -ENODEV;
1246         }
1247
1248         mutex_lock(&serial->parent->mutex);
1249         result = usb_autopm_get_interface(serial->parent->interface);
1250         if (result < 0)
1251                 goto err_out;
1252
1253         hso_dbg(0x1, "Opening %d\n", serial->minor);
1254
1255         /* setup */
1256         tty->driver_data = serial;
1257         tty_port_tty_set(&serial->port, tty);
1258
1259         /* check for port already opened, if not set the termios */
1260         serial->port.count++;
1261         if (serial->port.count == 1) {
1262                 serial->rx_state = RX_IDLE;
1263                 /* Force default termio settings */
1264                 _hso_serial_set_termios(tty);
1265                 tasklet_setup(&serial->unthrottle_tasklet,
1266                               hso_unthrottle_tasklet);
1267                 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1268                 if (result) {
1269                         hso_stop_serial_device(serial->parent);
1270                         serial->port.count--;
1271                 } else {
1272                         kref_get(&serial->parent->ref);
1273                 }
1274         } else {
1275                 hso_dbg(0x1, "Port was already open\n");
1276         }
1277
1278         usb_autopm_put_interface(serial->parent->interface);
1279
1280         /* done */
1281         if (result)
1282                 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1283 err_out:
1284         mutex_unlock(&serial->parent->mutex);
1285         return result;
1286 }
1287
1288 /* close the requested serial port */
1289 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1290 {
1291         struct hso_serial *serial = tty->driver_data;
1292         u8 usb_gone;
1293
1294         hso_dbg(0x1, "Closing serial port\n");
1295
1296         /* Open failed, no close cleanup required */
1297         if (serial == NULL)
1298                 return;
1299
1300         mutex_lock(&serial->parent->mutex);
1301         usb_gone = serial->parent->usb_gone;
1302
1303         if (!usb_gone)
1304                 usb_autopm_get_interface(serial->parent->interface);
1305
1306         /* reset the rts and dtr */
1307         /* do the actual close */
1308         serial->port.count--;
1309
1310         if (serial->port.count <= 0) {
1311                 serial->port.count = 0;
1312                 tty_port_tty_set(&serial->port, NULL);
1313                 if (!usb_gone)
1314                         hso_stop_serial_device(serial->parent);
1315                 tasklet_kill(&serial->unthrottle_tasklet);
1316         }
1317
1318         if (!usb_gone)
1319                 usb_autopm_put_interface(serial->parent->interface);
1320
1321         mutex_unlock(&serial->parent->mutex);
1322 }
1323
1324 /* close the requested serial port */
1325 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1326                             int count)
1327 {
1328         struct hso_serial *serial = tty->driver_data;
1329         int space, tx_bytes;
1330         unsigned long flags;
1331
1332         /* sanity check */
1333         if (serial == NULL) {
1334                 pr_err("%s: serial is NULL\n", __func__);
1335                 return -ENODEV;
1336         }
1337
1338         spin_lock_irqsave(&serial->serial_lock, flags);
1339
1340         space = serial->tx_data_length - serial->tx_buffer_count;
1341         tx_bytes = (count < space) ? count : space;
1342
1343         if (!tx_bytes)
1344                 goto out;
1345
1346         memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1347         serial->tx_buffer_count += tx_bytes;
1348
1349 out:
1350         spin_unlock_irqrestore(&serial->serial_lock, flags);
1351
1352         hso_kick_transmit(serial);
1353         /* done */
1354         return tx_bytes;
1355 }
1356
1357 /* how much room is there for writing */
1358 static unsigned int hso_serial_write_room(struct tty_struct *tty)
1359 {
1360         struct hso_serial *serial = tty->driver_data;
1361         unsigned int room;
1362         unsigned long flags;
1363
1364         spin_lock_irqsave(&serial->serial_lock, flags);
1365         room = serial->tx_data_length - serial->tx_buffer_count;
1366         spin_unlock_irqrestore(&serial->serial_lock, flags);
1367
1368         /* return free room */
1369         return room;
1370 }
1371
1372 static void hso_serial_cleanup(struct tty_struct *tty)
1373 {
1374         struct hso_serial *serial = tty->driver_data;
1375
1376         if (!serial)
1377                 return;
1378
1379         kref_put(&serial->parent->ref, hso_serial_ref_free);
1380 }
1381
1382 /* setup the term */
1383 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1384 {
1385         struct hso_serial *serial = tty->driver_data;
1386         unsigned long flags;
1387
1388         if (old)
1389                 hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
1390                         (unsigned int)tty->termios.c_cflag,
1391                         (unsigned int)old->c_cflag);
1392
1393         /* the actual setup */
1394         spin_lock_irqsave(&serial->serial_lock, flags);
1395         if (serial->port.count)
1396                 _hso_serial_set_termios(tty);
1397         else
1398                 tty->termios = *old;
1399         spin_unlock_irqrestore(&serial->serial_lock, flags);
1400
1401         /* done */
1402 }
1403
1404 /* how many characters in the buffer */
1405 static unsigned int hso_serial_chars_in_buffer(struct tty_struct *tty)
1406 {
1407         struct hso_serial *serial = tty->driver_data;
1408         unsigned long flags;
1409         unsigned int chars;
1410
1411         /* sanity check */
1412         if (serial == NULL)
1413                 return 0;
1414
1415         spin_lock_irqsave(&serial->serial_lock, flags);
1416         chars = serial->tx_buffer_count;
1417         spin_unlock_irqrestore(&serial->serial_lock, flags);
1418
1419         return chars;
1420 }
1421 static int tiocmget_submit_urb(struct hso_serial *serial,
1422                                struct hso_tiocmget *tiocmget,
1423                                struct usb_device *usb)
1424 {
1425         int result;
1426
1427         if (serial->parent->usb_gone)
1428                 return -ENODEV;
1429         usb_fill_int_urb(tiocmget->urb, usb,
1430                          usb_rcvintpipe(usb,
1431                                         tiocmget->endp->
1432                                         bEndpointAddress & 0x7F),
1433                          tiocmget->serial_state_notification,
1434                          sizeof(struct hso_serial_state_notification),
1435                          tiocmget_intr_callback, serial,
1436                          tiocmget->endp->bInterval);
1437         result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1438         if (result) {
1439                 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1440                          result);
1441         }
1442         return result;
1443
1444 }
1445
1446 static void tiocmget_intr_callback(struct urb *urb)
1447 {
1448         struct hso_serial *serial = urb->context;
1449         struct hso_tiocmget *tiocmget;
1450         int status = urb->status;
1451         u16 UART_state_bitmap, prev_UART_state_bitmap;
1452         struct uart_icount *icount;
1453         struct hso_serial_state_notification *serial_state_notification;
1454         struct usb_device *usb;
1455         struct usb_interface *interface;
1456         int if_num;
1457
1458         /* Sanity checks */
1459         if (!serial)
1460                 return;
1461         if (status) {
1462                 handle_usb_error(status, __func__, serial->parent);
1463                 return;
1464         }
1465
1466         /* tiocmget is only supported on HSO_PORT_MODEM */
1467         tiocmget = serial->tiocmget;
1468         if (!tiocmget)
1469                 return;
1470         BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1471
1472         usb = serial->parent->usb;
1473         interface = serial->parent->interface;
1474
1475         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1476
1477         /* wIndex should be the USB interface number of the port to which the
1478          * notification applies, which should always be the Modem port.
1479          */
1480         serial_state_notification = tiocmget->serial_state_notification;
1481         if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1482             serial_state_notification->bNotification != B_NOTIFICATION ||
1483             le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1484             le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1485             le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1486                 dev_warn(&usb->dev,
1487                          "hso received invalid serial state notification\n");
1488                 DUMP(serial_state_notification,
1489                      sizeof(struct hso_serial_state_notification));
1490         } else {
1491                 unsigned long flags;
1492
1493                 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1494                                                 UART_state_bitmap);
1495                 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1496                 icount = &tiocmget->icount;
1497                 spin_lock_irqsave(&serial->serial_lock, flags);
1498                 if ((UART_state_bitmap & B_OVERRUN) !=
1499                    (prev_UART_state_bitmap & B_OVERRUN))
1500                         icount->parity++;
1501                 if ((UART_state_bitmap & B_PARITY) !=
1502                    (prev_UART_state_bitmap & B_PARITY))
1503                         icount->parity++;
1504                 if ((UART_state_bitmap & B_FRAMING) !=
1505                    (prev_UART_state_bitmap & B_FRAMING))
1506                         icount->frame++;
1507                 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1508                    !(prev_UART_state_bitmap & B_RING_SIGNAL))
1509                         icount->rng++;
1510                 if ((UART_state_bitmap & B_BREAK) !=
1511                    (prev_UART_state_bitmap & B_BREAK))
1512                         icount->brk++;
1513                 if ((UART_state_bitmap & B_TX_CARRIER) !=
1514                    (prev_UART_state_bitmap & B_TX_CARRIER))
1515                         icount->dsr++;
1516                 if ((UART_state_bitmap & B_RX_CARRIER) !=
1517                    (prev_UART_state_bitmap & B_RX_CARRIER))
1518                         icount->dcd++;
1519                 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1520                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1521                 tiocmget->intr_completed = 1;
1522                 wake_up_interruptible(&tiocmget->waitq);
1523         }
1524         memset(serial_state_notification, 0,
1525                sizeof(struct hso_serial_state_notification));
1526         tiocmget_submit_urb(serial,
1527                             tiocmget,
1528                             serial->parent->usb);
1529 }
1530
1531 /*
1532  * next few functions largely stolen from drivers/serial/serial_core.c
1533  */
1534 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1535  * - mask passed in arg for lines of interest
1536  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1537  * Caller should use TIOCGICOUNT to see which one it was
1538  */
1539 static int
1540 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1541 {
1542         DECLARE_WAITQUEUE(wait, current);
1543         struct uart_icount cprev, cnow;
1544         struct hso_tiocmget  *tiocmget;
1545         int ret;
1546
1547         tiocmget = serial->tiocmget;
1548         if (!tiocmget)
1549                 return -ENOENT;
1550         /*
1551          * note the counters on entry
1552          */
1553         spin_lock_irq(&serial->serial_lock);
1554         memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1555         spin_unlock_irq(&serial->serial_lock);
1556         add_wait_queue(&tiocmget->waitq, &wait);
1557         for (;;) {
1558                 spin_lock_irq(&serial->serial_lock);
1559                 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1560                 spin_unlock_irq(&serial->serial_lock);
1561                 set_current_state(TASK_INTERRUPTIBLE);
1562                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1563                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1564                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
1565                         ret = 0;
1566                         break;
1567                 }
1568                 schedule();
1569                 /* see if a signal did it */
1570                 if (signal_pending(current)) {
1571                         ret = -ERESTARTSYS;
1572                         break;
1573                 }
1574                 cprev = cnow;
1575         }
1576         __set_current_state(TASK_RUNNING);
1577         remove_wait_queue(&tiocmget->waitq, &wait);
1578
1579         return ret;
1580 }
1581
1582 /*
1583  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1584  * Return: write counters to the user passed counter struct
1585  * NB: both 1->0 and 0->1 transitions are counted except for
1586  *     RI where only 0->1 is counted.
1587  */
1588 static int hso_get_count(struct tty_struct *tty,
1589                   struct serial_icounter_struct *icount)
1590 {
1591         struct uart_icount cnow;
1592         struct hso_serial *serial = tty->driver_data;
1593         struct hso_tiocmget  *tiocmget = serial->tiocmget;
1594
1595         memset(icount, 0, sizeof(struct serial_icounter_struct));
1596
1597         if (!tiocmget)
1598                  return -ENOENT;
1599         spin_lock_irq(&serial->serial_lock);
1600         memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1601         spin_unlock_irq(&serial->serial_lock);
1602
1603         icount->cts         = cnow.cts;
1604         icount->dsr         = cnow.dsr;
1605         icount->rng         = cnow.rng;
1606         icount->dcd         = cnow.dcd;
1607         icount->rx          = cnow.rx;
1608         icount->tx          = cnow.tx;
1609         icount->frame       = cnow.frame;
1610         icount->overrun     = cnow.overrun;
1611         icount->parity      = cnow.parity;
1612         icount->brk         = cnow.brk;
1613         icount->buf_overrun = cnow.buf_overrun;
1614
1615         return 0;
1616 }
1617
1618
1619 static int hso_serial_tiocmget(struct tty_struct *tty)
1620 {
1621         int retval;
1622         struct hso_serial *serial = tty->driver_data;
1623         struct hso_tiocmget  *tiocmget;
1624         u16 UART_state_bitmap;
1625
1626         /* sanity check */
1627         if (!serial) {
1628                 hso_dbg(0x1, "no tty structures\n");
1629                 return -EINVAL;
1630         }
1631         spin_lock_irq(&serial->serial_lock);
1632         retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1633             ((serial->dtr_state) ? TIOCM_DTR : 0);
1634         tiocmget = serial->tiocmget;
1635         if (tiocmget) {
1636
1637                 UART_state_bitmap = le16_to_cpu(
1638                         tiocmget->prev_UART_state_bitmap);
1639                 if (UART_state_bitmap & B_RING_SIGNAL)
1640                         retval |=  TIOCM_RNG;
1641                 if (UART_state_bitmap & B_RX_CARRIER)
1642                         retval |=  TIOCM_CD;
1643                 if (UART_state_bitmap & B_TX_CARRIER)
1644                         retval |=  TIOCM_DSR;
1645         }
1646         spin_unlock_irq(&serial->serial_lock);
1647         return retval;
1648 }
1649
1650 static int hso_serial_tiocmset(struct tty_struct *tty,
1651                                unsigned int set, unsigned int clear)
1652 {
1653         int val = 0;
1654         unsigned long flags;
1655         int if_num;
1656         struct hso_serial *serial = tty->driver_data;
1657         struct usb_interface *interface;
1658
1659         /* sanity check */
1660         if (!serial) {
1661                 hso_dbg(0x1, "no tty structures\n");
1662                 return -EINVAL;
1663         }
1664
1665         if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1666                 return -EINVAL;
1667
1668         interface = serial->parent->interface;
1669         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1670
1671         spin_lock_irqsave(&serial->serial_lock, flags);
1672         if (set & TIOCM_RTS)
1673                 serial->rts_state = 1;
1674         if (set & TIOCM_DTR)
1675                 serial->dtr_state = 1;
1676
1677         if (clear & TIOCM_RTS)
1678                 serial->rts_state = 0;
1679         if (clear & TIOCM_DTR)
1680                 serial->dtr_state = 0;
1681
1682         if (serial->dtr_state)
1683                 val |= 0x01;
1684         if (serial->rts_state)
1685                 val |= 0x02;
1686
1687         spin_unlock_irqrestore(&serial->serial_lock, flags);
1688
1689         return usb_control_msg(serial->parent->usb,
1690                                usb_sndctrlpipe(serial->parent->usb, 0), 0x22,
1691                                0x21, val, if_num, NULL, 0,
1692                                USB_CTRL_SET_TIMEOUT);
1693 }
1694
1695 static int hso_serial_ioctl(struct tty_struct *tty,
1696                             unsigned int cmd, unsigned long arg)
1697 {
1698         struct hso_serial *serial = tty->driver_data;
1699         int ret = 0;
1700         hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1701
1702         if (!serial)
1703                 return -ENODEV;
1704         switch (cmd) {
1705         case TIOCMIWAIT:
1706                 ret = hso_wait_modem_status(serial, arg);
1707                 break;
1708         default:
1709                 ret = -ENOIOCTLCMD;
1710                 break;
1711         }
1712         return ret;
1713 }
1714
1715
1716 /* starts a transmit */
1717 static void hso_kick_transmit(struct hso_serial *serial)
1718 {
1719         unsigned long flags;
1720         int res;
1721
1722         spin_lock_irqsave(&serial->serial_lock, flags);
1723         if (!serial->tx_buffer_count)
1724                 goto out;
1725
1726         if (serial->tx_urb_used)
1727                 goto out;
1728
1729         /* Wakeup USB interface if necessary */
1730         if (hso_get_activity(serial->parent) == -EAGAIN)
1731                 goto out;
1732
1733         /* Switch pointers around to avoid memcpy */
1734         swap(serial->tx_buffer, serial->tx_data);
1735         serial->tx_data_count = serial->tx_buffer_count;
1736         serial->tx_buffer_count = 0;
1737
1738         /* If serial->tx_data is set, it means we switched buffers */
1739         if (serial->tx_data && serial->write_data) {
1740                 res = serial->write_data(serial);
1741                 if (res >= 0)
1742                         serial->tx_urb_used = 1;
1743         }
1744 out:
1745         spin_unlock_irqrestore(&serial->serial_lock, flags);
1746 }
1747
1748 /* make a request (for reading and writing data to muxed serial port) */
1749 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1750                               struct urb *ctrl_urb,
1751                               struct usb_ctrlrequest *ctrl_req,
1752                               u8 *ctrl_urb_data, u32 size)
1753 {
1754         int result;
1755         int pipe;
1756
1757         /* Sanity check */
1758         if (!serial || !ctrl_urb || !ctrl_req) {
1759                 pr_err("%s: Wrong arguments\n", __func__);
1760                 return -EINVAL;
1761         }
1762
1763         /* initialize */
1764         ctrl_req->wValue = 0;
1765         ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1766         ctrl_req->wLength = cpu_to_le16(size);
1767
1768         if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1769                 /* Reading command */
1770                 ctrl_req->bRequestType = USB_DIR_IN |
1771                                          USB_TYPE_OPTION_VENDOR |
1772                                          USB_RECIP_INTERFACE;
1773                 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1774                 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1775         } else {
1776                 /* Writing command */
1777                 ctrl_req->bRequestType = USB_DIR_OUT |
1778                                          USB_TYPE_OPTION_VENDOR |
1779                                          USB_RECIP_INTERFACE;
1780                 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1781                 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1782         }
1783         /* syslog */
1784         hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1785                 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1786                 ctrl_req->bRequestType, ctrl_req->wLength, port);
1787
1788         /* Load ctrl urb */
1789         ctrl_urb->transfer_flags = 0;
1790         usb_fill_control_urb(ctrl_urb,
1791                              serial->parent->usb,
1792                              pipe,
1793                              (u8 *) ctrl_req,
1794                              ctrl_urb_data, size, ctrl_callback, serial);
1795         /* Send it on merry way */
1796         result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1797         if (result) {
1798                 dev_err(&ctrl_urb->dev->dev,
1799                         "%s failed submit ctrl_urb %d type %d\n", __func__,
1800                         result, type);
1801                 return result;
1802         }
1803
1804         /* done */
1805         return size;
1806 }
1807
1808 /* called by intr_callback when read occurs */
1809 static int hso_mux_serial_read(struct hso_serial *serial)
1810 {
1811         if (!serial)
1812                 return -EINVAL;
1813
1814         /* clean data */
1815         memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1816         /* make the request */
1817
1818         if (serial->num_rx_urbs != 1) {
1819                 dev_err(&serial->parent->interface->dev,
1820                         "ERROR: mux'd reads with multiple buffers "
1821                         "not possible\n");
1822                 return 0;
1823         }
1824         return mux_device_request(serial,
1825                                   USB_CDC_GET_ENCAPSULATED_RESPONSE,
1826                                   serial->parent->port_spec & HSO_PORT_MASK,
1827                                   serial->rx_urb[0],
1828                                   &serial->ctrl_req_rx,
1829                                   serial->rx_data[0], serial->rx_data_length);
1830 }
1831
1832 /* used for muxed serial port callback (muxed serial read) */
1833 static void intr_callback(struct urb *urb)
1834 {
1835         struct hso_shared_int *shared_int = urb->context;
1836         struct hso_serial *serial;
1837         unsigned char *port_req;
1838         int status = urb->status;
1839         unsigned long flags;
1840         int i;
1841
1842         usb_mark_last_busy(urb->dev);
1843
1844         /* sanity check */
1845         if (!shared_int)
1846                 return;
1847
1848         /* status check */
1849         if (status) {
1850                 handle_usb_error(status, __func__, NULL);
1851                 return;
1852         }
1853         hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1854
1855         /* what request? */
1856         port_req = urb->transfer_buffer;
1857         hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1858         /* loop over all muxed ports to find the one sending this */
1859         for (i = 0; i < 8; i++) {
1860                 /* max 8 channels on MUX */
1861                 if (*port_req & (1 << i)) {
1862                         serial = get_serial_by_shared_int_and_type(shared_int,
1863                                                                    (1 << i));
1864                         if (serial != NULL) {
1865                                 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1866                                         i);
1867                                 spin_lock_irqsave(&serial->serial_lock, flags);
1868                                 if (serial->rx_state == RX_IDLE &&
1869                                         serial->port.count > 0) {
1870                                         /* Setup and send a ctrl req read on
1871                                          * port i */
1872                                         if (!serial->rx_urb_filled[0]) {
1873                                                 serial->rx_state = RX_SENT;
1874                                                 hso_mux_serial_read(serial);
1875                                         } else
1876                                                 serial->rx_state = RX_PENDING;
1877                                 } else {
1878                                         hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1879                                                 i);
1880                                 }
1881                                 spin_unlock_irqrestore(&serial->serial_lock,
1882                                                        flags);
1883                         }
1884                 }
1885         }
1886         /* Resubmit interrupt urb */
1887         hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1888 }
1889
1890 /* called for writing to muxed serial port */
1891 static int hso_mux_serial_write_data(struct hso_serial *serial)
1892 {
1893         if (NULL == serial)
1894                 return -EINVAL;
1895
1896         return mux_device_request(serial,
1897                                   USB_CDC_SEND_ENCAPSULATED_COMMAND,
1898                                   serial->parent->port_spec & HSO_PORT_MASK,
1899                                   serial->tx_urb,
1900                                   &serial->ctrl_req_tx,
1901                                   serial->tx_data, serial->tx_data_count);
1902 }
1903
1904 /* write callback for Diag and CS port */
1905 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1906 {
1907         struct hso_serial *serial = urb->context;
1908         int status = urb->status;
1909         unsigned long flags;
1910
1911         /* sanity check */
1912         if (!serial) {
1913                 hso_dbg(0x1, "serial == NULL\n");
1914                 return;
1915         }
1916
1917         spin_lock_irqsave(&serial->serial_lock, flags);
1918         serial->tx_urb_used = 0;
1919         spin_unlock_irqrestore(&serial->serial_lock, flags);
1920         if (status) {
1921                 handle_usb_error(status, __func__, serial->parent);
1922                 return;
1923         }
1924         hso_put_activity(serial->parent);
1925         tty_port_tty_wakeup(&serial->port);
1926         hso_kick_transmit(serial);
1927
1928         hso_dbg(0x1, "\n");
1929 }
1930
1931 /* called for writing diag or CS serial port */
1932 static int hso_std_serial_write_data(struct hso_serial *serial)
1933 {
1934         int count = serial->tx_data_count;
1935         int result;
1936
1937         usb_fill_bulk_urb(serial->tx_urb,
1938                           serial->parent->usb,
1939                           usb_sndbulkpipe(serial->parent->usb,
1940                                           serial->out_endp->
1941                                           bEndpointAddress & 0x7F),
1942                           serial->tx_data, serial->tx_data_count,
1943                           hso_std_serial_write_bulk_callback, serial);
1944
1945         result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1946         if (result) {
1947                 dev_warn(&serial->parent->usb->dev,
1948                          "Failed to submit urb - res %d\n", result);
1949                 return result;
1950         }
1951
1952         return count;
1953 }
1954
1955 /* callback after read or write on muxed serial port */
1956 static void ctrl_callback(struct urb *urb)
1957 {
1958         struct hso_serial *serial = urb->context;
1959         struct usb_ctrlrequest *req;
1960         int status = urb->status;
1961         unsigned long flags;
1962
1963         /* sanity check */
1964         if (!serial)
1965                 return;
1966
1967         spin_lock_irqsave(&serial->serial_lock, flags);
1968         serial->tx_urb_used = 0;
1969         spin_unlock_irqrestore(&serial->serial_lock, flags);
1970         if (status) {
1971                 handle_usb_error(status, __func__, serial->parent);
1972                 return;
1973         }
1974
1975         /* what request? */
1976         req = (struct usb_ctrlrequest *)(urb->setup_packet);
1977         hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1978         hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1979         DUMP1(urb->transfer_buffer, urb->actual_length);
1980
1981         if (req->bRequestType ==
1982             (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1983                 /* response to a read command */
1984                 serial->rx_urb_filled[0] = 1;
1985                 spin_lock_irqsave(&serial->serial_lock, flags);
1986                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1987                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1988         } else {
1989                 hso_put_activity(serial->parent);
1990                 tty_port_tty_wakeup(&serial->port);
1991                 /* response to a write command */
1992                 hso_kick_transmit(serial);
1993         }
1994 }
1995
1996 /* handle RX data for serial port */
1997 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
1998 {
1999         struct tty_struct *tty;
2000         int count;
2001
2002         /* Sanity check */
2003         if (urb == NULL || serial == NULL) {
2004                 hso_dbg(0x1, "serial = NULL\n");
2005                 return -2;
2006         }
2007
2008         tty = tty_port_tty_get(&serial->port);
2009
2010         if (tty && tty_throttled(tty)) {
2011                 tty_kref_put(tty);
2012                 return -1;
2013         }
2014
2015         /* Push data to tty */
2016         hso_dbg(0x1, "data to push to tty\n");
2017         count = tty_buffer_request_room(&serial->port, urb->actual_length);
2018         if (count >= urb->actual_length) {
2019                 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2020                                        urb->actual_length);
2021                 tty_flip_buffer_push(&serial->port);
2022         } else {
2023                 dev_warn(&serial->parent->usb->dev,
2024                          "dropping data, %d bytes lost\n", urb->actual_length);
2025         }
2026
2027         tty_kref_put(tty);
2028
2029         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2030
2031         return 0;
2032 }
2033
2034
2035 /* Base driver functions */
2036
2037 static void hso_log_port(struct hso_device *hso_dev)
2038 {
2039         char *port_type;
2040         char port_dev[20];
2041
2042         switch (hso_dev->port_spec & HSO_PORT_MASK) {
2043         case HSO_PORT_CONTROL:
2044                 port_type = "Control";
2045                 break;
2046         case HSO_PORT_APP:
2047                 port_type = "Application";
2048                 break;
2049         case HSO_PORT_GPS:
2050                 port_type = "GPS";
2051                 break;
2052         case HSO_PORT_GPS_CONTROL:
2053                 port_type = "GPS control";
2054                 break;
2055         case HSO_PORT_APP2:
2056                 port_type = "Application2";
2057                 break;
2058         case HSO_PORT_PCSC:
2059                 port_type = "PCSC";
2060                 break;
2061         case HSO_PORT_DIAG:
2062                 port_type = "Diagnostic";
2063                 break;
2064         case HSO_PORT_DIAG2:
2065                 port_type = "Diagnostic2";
2066                 break;
2067         case HSO_PORT_MODEM:
2068                 port_type = "Modem";
2069                 break;
2070         case HSO_PORT_NETWORK:
2071                 port_type = "Network";
2072                 break;
2073         default:
2074                 port_type = "Unknown";
2075                 break;
2076         }
2077         if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2078                 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2079         } else
2080                 sprintf(port_dev, "/dev/%s%d", tty_filename,
2081                         dev2ser(hso_dev)->minor);
2082
2083         dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2084                 port_type, port_dev);
2085 }
2086
2087 static int hso_start_net_device(struct hso_device *hso_dev)
2088 {
2089         int i, result = 0;
2090         struct hso_net *hso_net = dev2net(hso_dev);
2091
2092         if (!hso_net)
2093                 return -ENODEV;
2094
2095         /* send URBs for all read buffers */
2096         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2097
2098                 /* Prep a receive URB */
2099                 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2100                                   hso_dev->usb,
2101                                   usb_rcvbulkpipe(hso_dev->usb,
2102                                                   hso_net->in_endp->
2103                                                   bEndpointAddress & 0x7F),
2104                                   hso_net->mux_bulk_rx_buf_pool[i],
2105                                   MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2106                                   hso_net);
2107
2108                 /* Put it out there so the device can send us stuff */
2109                 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2110                                         GFP_NOIO);
2111                 if (result)
2112                         dev_warn(&hso_dev->usb->dev,
2113                                 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2114                                 i, result);
2115         }
2116
2117         return result;
2118 }
2119
2120 static int hso_stop_net_device(struct hso_device *hso_dev)
2121 {
2122         int i;
2123         struct hso_net *hso_net = dev2net(hso_dev);
2124
2125         if (!hso_net)
2126                 return -ENODEV;
2127
2128         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2129                 if (hso_net->mux_bulk_rx_urb_pool[i])
2130                         usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2131
2132         }
2133         if (hso_net->mux_bulk_tx_urb)
2134                 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2135
2136         return 0;
2137 }
2138
2139 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2140 {
2141         int i, result = 0;
2142         struct hso_serial *serial = dev2ser(hso_dev);
2143
2144         if (!serial)
2145                 return -ENODEV;
2146
2147         /* If it is not the MUX port fill in and submit a bulk urb (already
2148          * allocated in hso_serial_start) */
2149         if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2150                 for (i = 0; i < serial->num_rx_urbs; i++) {
2151                         usb_fill_bulk_urb(serial->rx_urb[i],
2152                                           serial->parent->usb,
2153                                           usb_rcvbulkpipe(serial->parent->usb,
2154                                                           serial->in_endp->
2155                                                           bEndpointAddress &
2156                                                           0x7F),
2157                                           serial->rx_data[i],
2158                                           serial->rx_data_length,
2159                                           hso_std_serial_read_bulk_callback,
2160                                           serial);
2161                         result = usb_submit_urb(serial->rx_urb[i], flags);
2162                         if (result) {
2163                                 dev_warn(&serial->parent->usb->dev,
2164                                          "Failed to submit urb - res %d\n",
2165                                          result);
2166                                 break;
2167                         }
2168                 }
2169         } else {
2170                 mutex_lock(&serial->shared_int->shared_int_lock);
2171                 if (!serial->shared_int->use_count) {
2172                         result =
2173                             hso_mux_submit_intr_urb(serial->shared_int,
2174                                                     hso_dev->usb, flags);
2175                 }
2176                 serial->shared_int->use_count++;
2177                 mutex_unlock(&serial->shared_int->shared_int_lock);
2178         }
2179         if (serial->tiocmget)
2180                 tiocmget_submit_urb(serial,
2181                                     serial->tiocmget,
2182                                     serial->parent->usb);
2183         return result;
2184 }
2185
2186 static int hso_stop_serial_device(struct hso_device *hso_dev)
2187 {
2188         int i;
2189         struct hso_serial *serial = dev2ser(hso_dev);
2190         struct hso_tiocmget  *tiocmget;
2191
2192         if (!serial)
2193                 return -ENODEV;
2194
2195         for (i = 0; i < serial->num_rx_urbs; i++) {
2196                 if (serial->rx_urb[i]) {
2197                         usb_kill_urb(serial->rx_urb[i]);
2198                         serial->rx_urb_filled[i] = 0;
2199                 }
2200         }
2201         serial->curr_rx_urb_idx = 0;
2202
2203         if (serial->tx_urb)
2204                 usb_kill_urb(serial->tx_urb);
2205
2206         if (serial->shared_int) {
2207                 mutex_lock(&serial->shared_int->shared_int_lock);
2208                 if (serial->shared_int->use_count &&
2209                     (--serial->shared_int->use_count == 0)) {
2210                         struct urb *urb;
2211
2212                         urb = serial->shared_int->shared_intr_urb;
2213                         if (urb)
2214                                 usb_kill_urb(urb);
2215                 }
2216                 mutex_unlock(&serial->shared_int->shared_int_lock);
2217         }
2218         tiocmget = serial->tiocmget;
2219         if (tiocmget) {
2220                 wake_up_interruptible(&tiocmget->waitq);
2221                 usb_kill_urb(tiocmget->urb);
2222         }
2223
2224         return 0;
2225 }
2226
2227 static void hso_serial_tty_unregister(struct hso_serial *serial)
2228 {
2229         tty_unregister_device(tty_drv, serial->minor);
2230         release_minor(serial);
2231 }
2232
2233 static void hso_serial_common_free(struct hso_serial *serial)
2234 {
2235         int i;
2236
2237         for (i = 0; i < serial->num_rx_urbs; i++) {
2238                 /* unlink and free RX URB */
2239                 usb_free_urb(serial->rx_urb[i]);
2240                 /* free the RX buffer */
2241                 kfree(serial->rx_data[i]);
2242         }
2243
2244         /* unlink and free TX URB */
2245         usb_free_urb(serial->tx_urb);
2246         kfree(serial->tx_buffer);
2247         kfree(serial->tx_data);
2248         tty_port_destroy(&serial->port);
2249 }
2250
2251 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2252                                     int rx_size, int tx_size)
2253 {
2254         int i;
2255
2256         tty_port_init(&serial->port);
2257
2258         if (obtain_minor(serial))
2259                 goto exit2;
2260
2261         /* register our minor number */
2262         serial->parent->dev = tty_port_register_device_attr(&serial->port,
2263                         tty_drv, serial->minor, &serial->parent->interface->dev,
2264                         serial->parent, hso_serial_dev_groups);
2265         if (IS_ERR(serial->parent->dev)) {
2266                 release_minor(serial);
2267                 goto exit2;
2268         }
2269
2270         serial->magic = HSO_SERIAL_MAGIC;
2271         spin_lock_init(&serial->serial_lock);
2272         serial->num_rx_urbs = num_urbs;
2273
2274         /* RX, allocate urb and initialize */
2275
2276         /* prepare our RX buffer */
2277         serial->rx_data_length = rx_size;
2278         for (i = 0; i < serial->num_rx_urbs; i++) {
2279                 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2280                 if (!serial->rx_urb[i])
2281                         goto exit;
2282                 serial->rx_urb[i]->transfer_buffer = NULL;
2283                 serial->rx_urb[i]->transfer_buffer_length = 0;
2284                 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2285                                              GFP_KERNEL);
2286                 if (!serial->rx_data[i])
2287                         goto exit;
2288         }
2289
2290         /* TX, allocate urb and initialize */
2291         serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2292         if (!serial->tx_urb)
2293                 goto exit;
2294         serial->tx_urb->transfer_buffer = NULL;
2295         serial->tx_urb->transfer_buffer_length = 0;
2296         /* prepare our TX buffer */
2297         serial->tx_data_count = 0;
2298         serial->tx_buffer_count = 0;
2299         serial->tx_data_length = tx_size;
2300         serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2301         if (!serial->tx_data)
2302                 goto exit;
2303
2304         serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2305         if (!serial->tx_buffer)
2306                 goto exit;
2307
2308         return 0;
2309 exit:
2310         hso_serial_tty_unregister(serial);
2311 exit2:
2312         hso_serial_common_free(serial);
2313         return -1;
2314 }
2315
2316 /* Creates a general hso device */
2317 static struct hso_device *hso_create_device(struct usb_interface *intf,
2318                                             int port_spec)
2319 {
2320         struct hso_device *hso_dev;
2321
2322         hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2323         if (!hso_dev)
2324                 return NULL;
2325
2326         hso_dev->port_spec = port_spec;
2327         hso_dev->usb = interface_to_usbdev(intf);
2328         hso_dev->interface = intf;
2329         kref_init(&hso_dev->ref);
2330         mutex_init(&hso_dev->mutex);
2331
2332         INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2333         INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2334
2335         return hso_dev;
2336 }
2337
2338 /* Removes a network device in the network device table */
2339 static int remove_net_device(struct hso_device *hso_dev)
2340 {
2341         int i;
2342
2343         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2344                 if (network_table[i] == hso_dev) {
2345                         network_table[i] = NULL;
2346                         break;
2347                 }
2348         }
2349         if (i == HSO_MAX_NET_DEVICES)
2350                 return -1;
2351         return 0;
2352 }
2353
2354 /* Frees our network device */
2355 static void hso_free_net_device(struct hso_device *hso_dev)
2356 {
2357         int i;
2358         struct hso_net *hso_net = dev2net(hso_dev);
2359
2360         if (!hso_net)
2361                 return;
2362
2363         remove_net_device(hso_net->parent);
2364
2365         if (hso_net->net)
2366                 unregister_netdev(hso_net->net);
2367
2368         /* start freeing */
2369         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2370                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2371                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2372                 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2373         }
2374         usb_free_urb(hso_net->mux_bulk_tx_urb);
2375         kfree(hso_net->mux_bulk_tx_buf);
2376         hso_net->mux_bulk_tx_buf = NULL;
2377
2378         if (hso_net->net)
2379                 free_netdev(hso_net->net);
2380
2381         kfree(hso_dev);
2382 }
2383
2384 static const struct net_device_ops hso_netdev_ops = {
2385         .ndo_open       = hso_net_open,
2386         .ndo_stop       = hso_net_close,
2387         .ndo_start_xmit = hso_net_start_xmit,
2388         .ndo_tx_timeout = hso_net_tx_timeout,
2389 };
2390
2391 /* initialize the network interface */
2392 static void hso_net_init(struct net_device *net)
2393 {
2394         struct hso_net *hso_net = netdev_priv(net);
2395
2396         hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2397
2398         /* fill in the other fields */
2399         net->netdev_ops = &hso_netdev_ops;
2400         net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2401         net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2402         net->type = ARPHRD_NONE;
2403         net->mtu = DEFAULT_MTU - 14;
2404         net->tx_queue_len = 10;
2405         net->ethtool_ops = &ops;
2406
2407         /* and initialize the semaphore */
2408         spin_lock_init(&hso_net->net_lock);
2409 }
2410
2411 /* Adds a network device in the network device table */
2412 static int add_net_device(struct hso_device *hso_dev)
2413 {
2414         int i;
2415
2416         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2417                 if (network_table[i] == NULL) {
2418                         network_table[i] = hso_dev;
2419                         break;
2420                 }
2421         }
2422         if (i == HSO_MAX_NET_DEVICES)
2423                 return -1;
2424         return 0;
2425 }
2426
2427 static int hso_rfkill_set_block(void *data, bool blocked)
2428 {
2429         struct hso_device *hso_dev = data;
2430         int enabled = !blocked;
2431         int rv;
2432
2433         mutex_lock(&hso_dev->mutex);
2434         if (hso_dev->usb_gone)
2435                 rv = 0;
2436         else
2437                 rv = usb_control_msg(hso_dev->usb, usb_sndctrlpipe(hso_dev->usb, 0),
2438                                        enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2439                                        USB_CTRL_SET_TIMEOUT);
2440         mutex_unlock(&hso_dev->mutex);
2441         return rv;
2442 }
2443
2444 static const struct rfkill_ops hso_rfkill_ops = {
2445         .set_block = hso_rfkill_set_block,
2446 };
2447
2448 /* Creates and sets up everything for rfkill */
2449 static void hso_create_rfkill(struct hso_device *hso_dev,
2450                              struct usb_interface *interface)
2451 {
2452         struct hso_net *hso_net = dev2net(hso_dev);
2453         struct device *dev = &hso_net->net->dev;
2454         static u32 rfkill_counter;
2455
2456         snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2457                  rfkill_counter++);
2458
2459         hso_net->rfkill = rfkill_alloc(hso_net->name,
2460                                        &interface_to_usbdev(interface)->dev,
2461                                        RFKILL_TYPE_WWAN,
2462                                        &hso_rfkill_ops, hso_dev);
2463         if (!hso_net->rfkill)
2464                 return;
2465
2466         if (rfkill_register(hso_net->rfkill) < 0) {
2467                 rfkill_destroy(hso_net->rfkill);
2468                 hso_net->rfkill = NULL;
2469                 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2470                 return;
2471         }
2472 }
2473
2474 static struct device_type hso_type = {
2475         .name   = "wwan",
2476 };
2477
2478 /* Creates our network device */
2479 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2480                                                 int port_spec)
2481 {
2482         int result, i;
2483         struct net_device *net;
2484         struct hso_net *hso_net;
2485         struct hso_device *hso_dev;
2486
2487         hso_dev = hso_create_device(interface, port_spec);
2488         if (!hso_dev)
2489                 return NULL;
2490
2491         /* allocate our network device, then we can put in our private data */
2492         /* call hso_net_init to do the basic initialization */
2493         net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2494                            hso_net_init);
2495         if (!net) {
2496                 dev_err(&interface->dev, "Unable to create ethernet device\n");
2497                 goto err_hso_dev;
2498         }
2499
2500         hso_net = netdev_priv(net);
2501
2502         hso_dev->port_data.dev_net = hso_net;
2503         hso_net->net = net;
2504         hso_net->parent = hso_dev;
2505
2506         hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2507                                       USB_DIR_IN);
2508         if (!hso_net->in_endp) {
2509                 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2510                 goto err_net;
2511         }
2512         hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2513                                        USB_DIR_OUT);
2514         if (!hso_net->out_endp) {
2515                 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2516                 goto err_net;
2517         }
2518         SET_NETDEV_DEV(net, &interface->dev);
2519         SET_NETDEV_DEVTYPE(net, &hso_type);
2520
2521         /* start allocating */
2522         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2523                 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2524                 if (!hso_net->mux_bulk_rx_urb_pool[i])
2525                         goto err_mux_bulk_rx;
2526                 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2527                                                            GFP_KERNEL);
2528                 if (!hso_net->mux_bulk_rx_buf_pool[i])
2529                         goto err_mux_bulk_rx;
2530         }
2531         hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2532         if (!hso_net->mux_bulk_tx_urb)
2533                 goto err_mux_bulk_rx;
2534         hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2535         if (!hso_net->mux_bulk_tx_buf)
2536                 goto err_free_tx_urb;
2537
2538         result = add_net_device(hso_dev);
2539         if (result) {
2540                 dev_err(&interface->dev, "Failed to add net device\n");
2541                 goto err_free_tx_buf;
2542         }
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 err_rmv_ndev;
2549         }
2550
2551         hso_log_port(hso_dev);
2552
2553         hso_create_rfkill(hso_dev, interface);
2554
2555         return hso_dev;
2556
2557 err_rmv_ndev:
2558         remove_net_device(hso_dev);
2559 err_free_tx_buf:
2560         kfree(hso_net->mux_bulk_tx_buf);
2561 err_free_tx_urb:
2562         usb_free_urb(hso_net->mux_bulk_tx_urb);
2563 err_mux_bulk_rx:
2564         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2565                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2566                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2567         }
2568 err_net:
2569         free_netdev(net);
2570 err_hso_dev:
2571         kfree(hso_dev);
2572         return NULL;
2573 }
2574
2575 static void hso_free_tiomget(struct hso_serial *serial)
2576 {
2577         struct hso_tiocmget *tiocmget;
2578         if (!serial)
2579                 return;
2580         tiocmget = serial->tiocmget;
2581         if (tiocmget) {
2582                 usb_free_urb(tiocmget->urb);
2583                 tiocmget->urb = NULL;
2584                 serial->tiocmget = NULL;
2585                 kfree(tiocmget->serial_state_notification);
2586                 tiocmget->serial_state_notification = NULL;
2587                 kfree(tiocmget);
2588         }
2589 }
2590
2591 /* Frees an AT channel ( goes for both mux and non-mux ) */
2592 static void hso_free_serial_device(struct hso_device *hso_dev)
2593 {
2594         struct hso_serial *serial = dev2ser(hso_dev);
2595
2596         if (!serial)
2597                 return;
2598
2599         hso_serial_common_free(serial);
2600
2601         if (serial->shared_int) {
2602                 mutex_lock(&serial->shared_int->shared_int_lock);
2603                 if (--serial->shared_int->ref_count == 0)
2604                         hso_free_shared_int(serial->shared_int);
2605                 else
2606                         mutex_unlock(&serial->shared_int->shared_int_lock);
2607         }
2608         hso_free_tiomget(serial);
2609         kfree(serial);
2610         kfree(hso_dev);
2611 }
2612
2613 /* Creates a bulk AT channel */
2614 static struct hso_device *hso_create_bulk_serial_device(
2615                         struct usb_interface *interface, int port)
2616 {
2617         struct hso_device *hso_dev;
2618         struct hso_serial *serial;
2619         int num_urbs;
2620         struct hso_tiocmget *tiocmget;
2621
2622         hso_dev = hso_create_device(interface, port);
2623         if (!hso_dev)
2624                 return NULL;
2625
2626         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2627         if (!serial)
2628                 goto exit;
2629
2630         serial->parent = hso_dev;
2631         hso_dev->port_data.dev_serial = serial;
2632
2633         if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2634                 num_urbs = 2;
2635                 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2636                                            GFP_KERNEL);
2637                 if (!serial->tiocmget)
2638                         goto exit;
2639                 serial->tiocmget->serial_state_notification
2640                         = kzalloc(sizeof(struct hso_serial_state_notification),
2641                                            GFP_KERNEL);
2642                 if (!serial->tiocmget->serial_state_notification)
2643                         goto exit;
2644                 tiocmget = serial->tiocmget;
2645                 tiocmget->endp = hso_get_ep(interface,
2646                                             USB_ENDPOINT_XFER_INT,
2647                                             USB_DIR_IN);
2648                 if (!tiocmget->endp) {
2649                         dev_err(&interface->dev, "Failed to find INT IN ep\n");
2650                         goto exit;
2651                 }
2652
2653                 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2654                 if (!tiocmget->urb)
2655                         goto exit;
2656
2657                 mutex_init(&tiocmget->mutex);
2658                 init_waitqueue_head(&tiocmget->waitq);
2659         } else {
2660                 num_urbs = 1;
2661         }
2662
2663         if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2664                                      BULK_URB_TX_SIZE))
2665                 goto exit;
2666
2667         serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2668                                      USB_DIR_IN);
2669         if (!serial->in_endp) {
2670                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2671                 goto exit2;
2672         }
2673
2674         if (!
2675             (serial->out_endp =
2676              hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2677                 dev_err(&interface->dev, "Failed to find BULK OUT ep\n");
2678                 goto exit2;
2679         }
2680
2681         serial->write_data = hso_std_serial_write_data;
2682
2683         /* setup the proc dirs and files if needed */
2684         hso_log_port(hso_dev);
2685
2686         /* done, return it */
2687         return hso_dev;
2688
2689 exit2:
2690         hso_serial_tty_unregister(serial);
2691         hso_serial_common_free(serial);
2692 exit:
2693         hso_free_tiomget(serial);
2694         kfree(serial);
2695         kfree(hso_dev);
2696         return NULL;
2697 }
2698
2699 /* Creates a multiplexed AT channel */
2700 static
2701 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2702                                                 int port,
2703                                                 struct hso_shared_int *mux)
2704 {
2705         struct hso_device *hso_dev;
2706         struct hso_serial *serial;
2707         int port_spec;
2708
2709         port_spec = HSO_INTF_MUX;
2710         port_spec &= ~HSO_PORT_MASK;
2711
2712         port_spec |= hso_mux_to_port(port);
2713         if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2714                 return NULL;
2715
2716         hso_dev = hso_create_device(interface, port_spec);
2717         if (!hso_dev)
2718                 return NULL;
2719
2720         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2721         if (!serial)
2722                 goto exit;
2723
2724         hso_dev->port_data.dev_serial = serial;
2725         serial->parent = hso_dev;
2726
2727         if (hso_serial_common_create
2728             (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2729                 goto exit;
2730
2731         serial->tx_data_length--;
2732         serial->write_data = hso_mux_serial_write_data;
2733
2734         serial->shared_int = mux;
2735         mutex_lock(&serial->shared_int->shared_int_lock);
2736         serial->shared_int->ref_count++;
2737         mutex_unlock(&serial->shared_int->shared_int_lock);
2738
2739         /* setup the proc dirs and files if needed */
2740         hso_log_port(hso_dev);
2741
2742         /* done, return it */
2743         return hso_dev;
2744
2745 exit:
2746         if (serial) {
2747                 tty_unregister_device(tty_drv, serial->minor);
2748                 kfree(serial);
2749         }
2750         kfree(hso_dev);
2751         return NULL;
2752
2753 }
2754
2755 static void hso_free_shared_int(struct hso_shared_int *mux)
2756 {
2757         usb_free_urb(mux->shared_intr_urb);
2758         kfree(mux->shared_intr_buf);
2759         mutex_unlock(&mux->shared_int_lock);
2760         kfree(mux);
2761 }
2762
2763 static
2764 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2765 {
2766         struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2767
2768         if (!mux)
2769                 return NULL;
2770
2771         mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2772                                     USB_DIR_IN);
2773         if (!mux->intr_endp) {
2774                 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2775                 goto exit;
2776         }
2777
2778         mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2779         if (!mux->shared_intr_urb)
2780                 goto exit;
2781         mux->shared_intr_buf =
2782                 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2783                         GFP_KERNEL);
2784         if (!mux->shared_intr_buf)
2785                 goto exit;
2786
2787         mutex_init(&mux->shared_int_lock);
2788
2789         return mux;
2790
2791 exit:
2792         kfree(mux->shared_intr_buf);
2793         usb_free_urb(mux->shared_intr_urb);
2794         kfree(mux);
2795         return NULL;
2796 }
2797
2798 /* Gets the port spec for a certain interface */
2799 static int hso_get_config_data(struct usb_interface *interface)
2800 {
2801         struct usb_device *usbdev = interface_to_usbdev(interface);
2802         u8 *config_data = kmalloc(17, GFP_KERNEL);
2803         u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2804         s32 result;
2805
2806         if (!config_data)
2807                 return -ENOMEM;
2808         if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2809                             0x86, 0xC0, 0, 0, config_data, 17,
2810                             USB_CTRL_SET_TIMEOUT) != 0x11) {
2811                 kfree(config_data);
2812                 return -EIO;
2813         }
2814
2815         /* check if we have a valid interface */
2816         if (if_num > 16) {
2817                 kfree(config_data);
2818                 return -EINVAL;
2819         }
2820
2821         switch (config_data[if_num]) {
2822         case 0x0:
2823                 result = 0;
2824                 break;
2825         case 0x1:
2826                 result = HSO_PORT_DIAG;
2827                 break;
2828         case 0x2:
2829                 result = HSO_PORT_GPS;
2830                 break;
2831         case 0x3:
2832                 result = HSO_PORT_GPS_CONTROL;
2833                 break;
2834         case 0x4:
2835                 result = HSO_PORT_APP;
2836                 break;
2837         case 0x5:
2838                 result = HSO_PORT_APP2;
2839                 break;
2840         case 0x6:
2841                 result = HSO_PORT_CONTROL;
2842                 break;
2843         case 0x7:
2844                 result = HSO_PORT_NETWORK;
2845                 break;
2846         case 0x8:
2847                 result = HSO_PORT_MODEM;
2848                 break;
2849         case 0x9:
2850                 result = HSO_PORT_MSD;
2851                 break;
2852         case 0xa:
2853                 result = HSO_PORT_PCSC;
2854                 break;
2855         case 0xb:
2856                 result = HSO_PORT_VOICE;
2857                 break;
2858         default:
2859                 result = 0;
2860         }
2861
2862         if (result)
2863                 result |= HSO_INTF_BULK;
2864
2865         if (config_data[16] & 0x1)
2866                 result |= HSO_INFO_CRC_BUG;
2867
2868         kfree(config_data);
2869         return result;
2870 }
2871
2872 /* called once for each interface upon device insertion */
2873 static int hso_probe(struct usb_interface *interface,
2874                      const struct usb_device_id *id)
2875 {
2876         int mux, i, if_num, port_spec;
2877         unsigned char port_mask;
2878         struct hso_device *hso_dev = NULL;
2879         struct hso_shared_int *shared_int;
2880         struct hso_device *tmp_dev = NULL;
2881
2882         if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2883                 dev_err(&interface->dev, "Not our interface\n");
2884                 return -ENODEV;
2885         }
2886
2887         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2888
2889         /* Get the interface/port specification from either driver_info or from
2890          * the device itself */
2891         if (id->driver_info) {
2892                 /* if_num is controlled by the device, driver_info is a 0 terminated
2893                  * array. Make sure, the access is in bounds! */
2894                 for (i = 0; i <= if_num; ++i)
2895                         if (((u32 *)(id->driver_info))[i] == 0)
2896                                 goto exit;
2897                 port_spec = ((u32 *)(id->driver_info))[if_num];
2898         } else {
2899                 port_spec = hso_get_config_data(interface);
2900                 if (port_spec < 0)
2901                         goto exit;
2902         }
2903
2904         /* Check if we need to switch to alt interfaces prior to port
2905          * configuration */
2906         if (interface->num_altsetting > 1)
2907                 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2908         interface->needs_remote_wakeup = 1;
2909
2910         /* Allocate new hso device(s) */
2911         switch (port_spec & HSO_INTF_MASK) {
2912         case HSO_INTF_MUX:
2913                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2914                         /* Create the network device */
2915                         if (!disable_net) {
2916                                 hso_dev = hso_create_net_device(interface,
2917                                                                 port_spec);
2918                                 if (!hso_dev)
2919                                         goto exit;
2920                                 tmp_dev = hso_dev;
2921                         }
2922                 }
2923
2924                 if (hso_get_mux_ports(interface, &port_mask))
2925                         /* TODO: de-allocate everything */
2926                         goto exit;
2927
2928                 shared_int = hso_create_shared_int(interface);
2929                 if (!shared_int)
2930                         goto exit;
2931
2932                 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2933                         if (port_mask & i) {
2934                                 hso_dev = hso_create_mux_serial_device(
2935                                                 interface, i, shared_int);
2936                                 if (!hso_dev)
2937                                         goto exit;
2938                         }
2939                 }
2940
2941                 if (tmp_dev)
2942                         hso_dev = tmp_dev;
2943                 break;
2944
2945         case HSO_INTF_BULK:
2946                 /* It's a regular bulk interface */
2947                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2948                         if (!disable_net)
2949                                 hso_dev =
2950                                     hso_create_net_device(interface, port_spec);
2951                 } else {
2952                         hso_dev =
2953                             hso_create_bulk_serial_device(interface, port_spec);
2954                 }
2955                 if (!hso_dev)
2956                         goto exit;
2957                 break;
2958         default:
2959                 goto exit;
2960         }
2961
2962         /* save our data pointer in this device */
2963         usb_set_intfdata(interface, hso_dev);
2964
2965         /* done */
2966         return 0;
2967 exit:
2968         hso_free_interface(interface);
2969         return -ENODEV;
2970 }
2971
2972 /* device removed, cleaning up */
2973 static void hso_disconnect(struct usb_interface *interface)
2974 {
2975         hso_free_interface(interface);
2976
2977         /* remove reference of our private data */
2978         usb_set_intfdata(interface, NULL);
2979 }
2980
2981 static void async_get_intf(struct work_struct *data)
2982 {
2983         struct hso_device *hso_dev =
2984             container_of(data, struct hso_device, async_get_intf);
2985         usb_autopm_get_interface(hso_dev->interface);
2986 }
2987
2988 static void async_put_intf(struct work_struct *data)
2989 {
2990         struct hso_device *hso_dev =
2991             container_of(data, struct hso_device, async_put_intf);
2992         usb_autopm_put_interface(hso_dev->interface);
2993 }
2994
2995 static int hso_get_activity(struct hso_device *hso_dev)
2996 {
2997         if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2998                 if (!hso_dev->is_active) {
2999                         hso_dev->is_active = 1;
3000                         schedule_work(&hso_dev->async_get_intf);
3001                 }
3002         }
3003
3004         if (hso_dev->usb->state != USB_STATE_CONFIGURED)
3005                 return -EAGAIN;
3006
3007         usb_mark_last_busy(hso_dev->usb);
3008
3009         return 0;
3010 }
3011
3012 static int hso_put_activity(struct hso_device *hso_dev)
3013 {
3014         if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
3015                 if (hso_dev->is_active) {
3016                         hso_dev->is_active = 0;
3017                         schedule_work(&hso_dev->async_put_intf);
3018                         return -EAGAIN;
3019                 }
3020         }
3021         hso_dev->is_active = 0;
3022         return 0;
3023 }
3024
3025 /* called by kernel when we need to suspend device */
3026 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3027 {
3028         int i, result;
3029
3030         /* Stop all serial ports */
3031         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3032                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3033                         result = hso_stop_serial_device(serial_table[i]);
3034                         if (result)
3035                                 goto out;
3036                 }
3037         }
3038
3039         /* Stop all network ports */
3040         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3041                 if (network_table[i] &&
3042                     (network_table[i]->interface == iface)) {
3043                         result = hso_stop_net_device(network_table[i]);
3044                         if (result)
3045                                 goto out;
3046                 }
3047         }
3048
3049 out:
3050         return 0;
3051 }
3052
3053 /* called by kernel when we need to resume device */
3054 static int hso_resume(struct usb_interface *iface)
3055 {
3056         int i, result = 0;
3057         struct hso_net *hso_net;
3058
3059         /* Start all serial ports */
3060         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3061                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3062                         if (dev2ser(serial_table[i])->port.count) {
3063                                 result =
3064                                     hso_start_serial_device(serial_table[i], GFP_NOIO);
3065                                 hso_kick_transmit(dev2ser(serial_table[i]));
3066                                 if (result)
3067                                         goto out;
3068                         }
3069                 }
3070         }
3071
3072         /* Start all network ports */
3073         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3074                 if (network_table[i] &&
3075                     (network_table[i]->interface == iface)) {
3076                         hso_net = dev2net(network_table[i]);
3077                         if (hso_net->flags & IFF_UP) {
3078                                 /* First transmit any lingering data,
3079                                    then restart the device. */
3080                                 if (hso_net->skb_tx_buf) {
3081                                         dev_dbg(&iface->dev,
3082                                                 "Transmitting"
3083                                                 " lingering data\n");
3084                                         hso_net_start_xmit(hso_net->skb_tx_buf,
3085                                                            hso_net->net);
3086                                         hso_net->skb_tx_buf = NULL;
3087                                 }
3088                                 result = hso_start_net_device(network_table[i]);
3089                                 if (result)
3090                                         goto out;
3091                         }
3092                 }
3093         }
3094
3095 out:
3096         return result;
3097 }
3098
3099 static void hso_serial_ref_free(struct kref *ref)
3100 {
3101         struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3102
3103         hso_free_serial_device(hso_dev);
3104 }
3105
3106 static void hso_free_interface(struct usb_interface *interface)
3107 {
3108         struct hso_serial *serial;
3109         int i;
3110
3111         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3112                 if (serial_table[i] &&
3113                     (serial_table[i]->interface == interface)) {
3114                         serial = dev2ser(serial_table[i]);
3115                         tty_port_tty_hangup(&serial->port, false);
3116                         mutex_lock(&serial->parent->mutex);
3117                         serial->parent->usb_gone = 1;
3118                         mutex_unlock(&serial->parent->mutex);
3119                         cancel_work_sync(&serial_table[i]->async_put_intf);
3120                         cancel_work_sync(&serial_table[i]->async_get_intf);
3121                         hso_serial_tty_unregister(serial);
3122                         kref_put(&serial->parent->ref, hso_serial_ref_free);
3123                 }
3124         }
3125
3126         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3127                 if (network_table[i] &&
3128                     (network_table[i]->interface == interface)) {
3129                         struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3130                         /* hso_stop_net_device doesn't stop the net queue since
3131                          * traffic needs to start it again when suspended */
3132                         netif_stop_queue(dev2net(network_table[i])->net);
3133                         hso_stop_net_device(network_table[i]);
3134                         cancel_work_sync(&network_table[i]->async_put_intf);
3135                         cancel_work_sync(&network_table[i]->async_get_intf);
3136                         if (rfk) {
3137                                 rfkill_unregister(rfk);
3138                                 rfkill_destroy(rfk);
3139                         }
3140                         hso_free_net_device(network_table[i]);
3141                 }
3142         }
3143 }
3144
3145 /* Helper functions */
3146
3147 /* Get the endpoint ! */
3148 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3149                                                   int type, int dir)
3150 {
3151         int i;
3152         struct usb_host_interface *iface = intf->cur_altsetting;
3153         struct usb_endpoint_descriptor *endp;
3154
3155         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3156                 endp = &iface->endpoint[i].desc;
3157                 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3158                     (usb_endpoint_type(endp) == type))
3159                         return endp;
3160         }
3161
3162         return NULL;
3163 }
3164
3165 /* Get the byte that describes which ports are enabled */
3166 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3167 {
3168         int i;
3169         struct usb_host_interface *iface = intf->cur_altsetting;
3170
3171         if (iface->extralen == 3) {
3172                 *ports = iface->extra[2];
3173                 return 0;
3174         }
3175
3176         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3177                 if (iface->endpoint[i].extralen == 3) {
3178                         *ports = iface->endpoint[i].extra[2];
3179                         return 0;
3180                 }
3181         }
3182
3183         return -1;
3184 }
3185
3186 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3187 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3188                                    struct usb_device *usb, gfp_t gfp)
3189 {
3190         int result;
3191
3192         usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3193                          usb_rcvintpipe(usb,
3194                                 shared_int->intr_endp->bEndpointAddress & 0x7F),
3195                          shared_int->shared_intr_buf,
3196                          1,
3197                          intr_callback, shared_int,
3198                          shared_int->intr_endp->bInterval);
3199
3200         result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3201         if (result)
3202                 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3203                         result);
3204
3205         return result;
3206 }
3207
3208 /* operations setup of the serial interface */
3209 static const struct tty_operations hso_serial_ops = {
3210         .open = hso_serial_open,
3211         .close = hso_serial_close,
3212         .write = hso_serial_write,
3213         .write_room = hso_serial_write_room,
3214         .cleanup = hso_serial_cleanup,
3215         .ioctl = hso_serial_ioctl,
3216         .set_termios = hso_serial_set_termios,
3217         .chars_in_buffer = hso_serial_chars_in_buffer,
3218         .tiocmget = hso_serial_tiocmget,
3219         .tiocmset = hso_serial_tiocmset,
3220         .get_icount = hso_get_count,
3221         .unthrottle = hso_unthrottle
3222 };
3223
3224 static struct usb_driver hso_driver = {
3225         .name = driver_name,
3226         .probe = hso_probe,
3227         .disconnect = hso_disconnect,
3228         .id_table = hso_ids,
3229         .suspend = hso_suspend,
3230         .resume = hso_resume,
3231         .reset_resume = hso_resume,
3232         .supports_autosuspend = 1,
3233         .disable_hub_initiated_lpm = 1,
3234 };
3235
3236 static int __init hso_init(void)
3237 {
3238         int i;
3239         int result;
3240
3241         /* put it in the log */
3242         pr_info("%s\n", version);
3243
3244         /* Initialise the serial table semaphore and table */
3245         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3246                 serial_table[i] = NULL;
3247
3248         /* allocate our driver using the proper amount of supported minors */
3249         tty_drv = tty_alloc_driver(HSO_SERIAL_TTY_MINORS, TTY_DRIVER_REAL_RAW |
3250                         TTY_DRIVER_DYNAMIC_DEV);
3251         if (IS_ERR(tty_drv))
3252                 return PTR_ERR(tty_drv);
3253
3254         /* fill in all needed values */
3255         tty_drv->driver_name = driver_name;
3256         tty_drv->name = tty_filename;
3257
3258         /* if major number is provided as parameter, use that one */
3259         if (tty_major)
3260                 tty_drv->major = tty_major;
3261
3262         tty_drv->minor_start = 0;
3263         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3264         tty_drv->subtype = SERIAL_TYPE_NORMAL;
3265         tty_drv->init_termios = tty_std_termios;
3266         hso_init_termios(&tty_drv->init_termios);
3267         tty_set_operations(tty_drv, &hso_serial_ops);
3268
3269         /* register the tty driver */
3270         result = tty_register_driver(tty_drv);
3271         if (result) {
3272                 pr_err("%s - tty_register_driver failed(%d)\n",
3273                        __func__, result);
3274                 goto err_free_tty;
3275         }
3276
3277         /* register this module as an usb driver */
3278         result = usb_register(&hso_driver);
3279         if (result) {
3280                 pr_err("Could not register hso driver - error: %d\n", result);
3281                 goto err_unreg_tty;
3282         }
3283
3284         /* done */
3285         return 0;
3286 err_unreg_tty:
3287         tty_unregister_driver(tty_drv);
3288 err_free_tty:
3289         tty_driver_kref_put(tty_drv);
3290         return result;
3291 }
3292
3293 static void __exit hso_exit(void)
3294 {
3295         pr_info("unloaded\n");
3296
3297         tty_unregister_driver(tty_drv);
3298         /* deregister the usb driver */
3299         usb_deregister(&hso_driver);
3300         tty_driver_kref_put(tty_drv);
3301 }
3302
3303 /* Module definitions */
3304 module_init(hso_init);
3305 module_exit(hso_exit);
3306
3307 MODULE_AUTHOR(MOD_AUTHOR);
3308 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3309 MODULE_LICENSE("GPL");
3310
3311 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3312 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3313 module_param(debug, int, 0644);
3314
3315 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3316 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3317 module_param(tty_major, int, 0644);
3318
3319 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3320 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3321 module_param(disable_net, int, 0644);