drivers/net/usb/hso.c

   1 /******************************************************************************
   2  *
   3  * Driver for Option High Speed Mobile Devices.
   4  *
   5  *  Copyright (C) 2008 Option International
   6  *                     Filip Aben <f.aben@option.com>
   7  *                     Denis Joseph Barrow <d.barow@option.com>
   8  *                     Jan Dumon <j.dumon@option.com>
   9  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
  10  *                      <ajb@spheresystems.co.uk>
  11  *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
  12  *  Copyright (C) 2008 Novell, Inc.
  13  *
  14  *  This program is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License version 2 as
  16  *  published by the Free Software Foundation.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software
  25  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
  26  *  USA
  27  *
  28  *
  29  *****************************************************************************/
  30
  31 /******************************************************************************
  32  *
  33  * Description of the device:
  34  *
  35  * Interface 0: Contains the IP network interface on the bulk end points.
  36  *              The multiplexed serial ports are using the interrupt and
  37  *              control endpoints.
  38  *              Interrupt contains a bitmap telling which multiplexed
  39  *              serialport needs servicing.
  40  *
  41  * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
  42  *              port is opened, as this have a huge impact on the network port
  43  *              throughput.
  44  *
  45  * Interface 2: Standard modem interface - circuit switched interface, this
  46  *              can be used to make a standard ppp connection however it
  47  *              should not be used in conjunction with the IP network interface
  48  *              enabled for USB performance reasons i.e. if using this set
  49  *              ideally disable_net=1.
  50  *
  51  *****************************************************************************/
  52
  53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  54
  55 #include <linux/sched/signal.h>
  56 #include <linux/slab.h>
  57 #include <linux/init.h>
  58 #include <linux/delay.h>
  59 #include <linux/netdevice.h>
  60 #include <linux/module.h>
  61 #include <linux/ethtool.h>
  62 #include <linux/usb.h>
  63 #include <linux/tty.h>
  64 #include <linux/tty_driver.h>
  65 #include <linux/tty_flip.h>
  66 #include <linux/kmod.h>
  67 #include <linux/rfkill.h>
  68 #include <linux/ip.h>
  69 #include <linux/uaccess.h>
  70 #include <linux/usb/cdc.h>
  71 #include <net/arp.h>
  72 #include <asm/byteorder.h>
  73 #include <linux/serial_core.h>
  74 #include <linux/serial.h>
  75
  76
  77 #define MOD_AUTHOR                      "Option Wireless"
  78 #define MOD_DESCRIPTION                 "USB High Speed Option driver"
  79
  80 #define HSO_MAX_NET_DEVICES             10
  81 #define HSO__MAX_MTU                    2048
  82 #define DEFAULT_MTU                     1500
  83 #define DEFAULT_MRU                     1500
  84
  85 #define CTRL_URB_RX_SIZE                1024
  86 #define CTRL_URB_TX_SIZE                64
  87
  88 #define BULK_URB_RX_SIZE                4096
  89 #define BULK_URB_TX_SIZE                8192
  90
  91 #define MUX_BULK_RX_BUF_SIZE            HSO__MAX_MTU
  92 #define MUX_BULK_TX_BUF_SIZE            HSO__MAX_MTU
  93 #define MUX_BULK_RX_BUF_COUNT           4
  94 #define USB_TYPE_OPTION_VENDOR          0x20
  95
  96 /* These definitions are used with the struct hso_net flags element */
  97 /* - use *_bit operations on it. (bit indices not values.) */
  98 #define HSO_NET_RUNNING                 0
  99
 100 #define HSO_NET_TX_TIMEOUT              (HZ*10)
 101
 102 #define HSO_SERIAL_MAGIC                0x48534f31
 103
 104 /* Number of ttys to handle */
 105 #define HSO_SERIAL_TTY_MINORS           256
 106
 107 #define MAX_RX_URBS                     2
 108
 109 /*****************************************************************************/
 110 /* Debugging functions                                                       */
 111 /*****************************************************************************/
 112 #define hso_dbg(lvl, fmt, ...)                                          \
 113 do {                                                                    \
 114         if ((lvl) & debug)                                              \
 115                 pr_info("[%d:%s] " fmt,                                 \
 116                         __LINE__, __func__, ##__VA_ARGS__);             \
 117 } while (0)
 118
 119 /*****************************************************************************/
 120 /* Enumerators                                                               */
 121 /*****************************************************************************/
 122 enum pkt_parse_state {
 123         WAIT_IP,
 124         WAIT_DATA,
 125         WAIT_SYNC
 126 };
 127
 128 /*****************************************************************************/
 129 /* Structs                                                                   */
 130 /*****************************************************************************/
 131
 132 struct hso_shared_int {
 133         struct usb_endpoint_descriptor *intr_endp;
 134         void *shared_intr_buf;
 135         struct urb *shared_intr_urb;
 136         struct usb_device *usb;
 137         int use_count;
 138         int ref_count;
 139         struct mutex shared_int_lock;
 140 };
 141
 142 struct hso_net {
 143         struct hso_device *parent;
 144         struct net_device *net;
 145         struct rfkill *rfkill;
 146         char name[24];
 147
 148         struct usb_endpoint_descriptor *in_endp;
 149         struct usb_endpoint_descriptor *out_endp;
 150
 151         struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
 152         struct urb *mux_bulk_tx_urb;
 153         void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
 154         void *mux_bulk_tx_buf;
 155
 156         struct sk_buff *skb_rx_buf;
 157         struct sk_buff *skb_tx_buf;
 158
 159         enum pkt_parse_state rx_parse_state;
 160         spinlock_t net_lock;
 161
 162         unsigned short rx_buf_size;
 163         unsigned short rx_buf_missing;
 164         struct iphdr rx_ip_hdr;
 165
 166         unsigned long flags;
 167 };
 168
 169 enum rx_ctrl_state{
 170         RX_IDLE,
 171         RX_SENT,
 172         RX_PENDING
 173 };
 174
 175 #define BM_REQUEST_TYPE (0xa1)
 176 #define B_NOTIFICATION  (0x20)
 177 #define W_VALUE         (0x0)
 178 #define W_LENGTH        (0x2)
 179
 180 #define B_OVERRUN       (0x1<<6)
 181 #define B_PARITY        (0x1<<5)
 182 #define B_FRAMING       (0x1<<4)
 183 #define B_RING_SIGNAL   (0x1<<3)
 184 #define B_BREAK         (0x1<<2)
 185 #define B_TX_CARRIER    (0x1<<1)
 186 #define B_RX_CARRIER    (0x1<<0)
 187
 188 struct hso_serial_state_notification {
 189         u8 bmRequestType;
 190         u8 bNotification;
 191         u16 wValue;
 192         u16 wIndex;
 193         u16 wLength;
 194         u16 UART_state_bitmap;
 195 } __packed;
 196
 197 struct hso_tiocmget {
 198         struct mutex mutex;
 199         wait_queue_head_t waitq;
 200         int    intr_completed;
 201         struct usb_endpoint_descriptor *endp;
 202         struct urb *urb;
 203         struct hso_serial_state_notification serial_state_notification;
 204         u16    prev_UART_state_bitmap;
 205         struct uart_icount icount;
 206 };
 207
 208
 209 struct hso_serial {
 210         struct hso_device *parent;
 211         int magic;
 212         u8 minor;
 213
 214         struct hso_shared_int *shared_int;
 215
 216         /* rx/tx urb could be either a bulk urb or a control urb depending
 217            on which serial port it is used on. */
 218         struct urb *rx_urb[MAX_RX_URBS];
 219         u8 num_rx_urbs;
 220         u8 *rx_data[MAX_RX_URBS];
 221         u16 rx_data_length;     /* should contain allocated length */
 222
 223         struct urb *tx_urb;
 224         u8 *tx_data;
 225         u8 *tx_buffer;
 226         u16 tx_data_length;     /* should contain allocated length */
 227         u16 tx_data_count;
 228         u16 tx_buffer_count;
 229         struct usb_ctrlrequest ctrl_req_tx;
 230         struct usb_ctrlrequest ctrl_req_rx;
 231
 232         struct usb_endpoint_descriptor *in_endp;
 233         struct usb_endpoint_descriptor *out_endp;
 234
 235         enum rx_ctrl_state rx_state;
 236         u8 rts_state;
 237         u8 dtr_state;
 238         unsigned tx_urb_used:1;
 239
 240         struct tty_port port;
 241         /* from usb_serial_port */
 242         spinlock_t serial_lock;
 243
 244         int (*write_data) (struct hso_serial *serial);
 245         struct hso_tiocmget  *tiocmget;
 246         /* Hacks required to get flow control
 247          * working on the serial receive buffers
 248          * so as not to drop characters on the floor.
 249          */
 250         int  curr_rx_urb_idx;
 251         u8   rx_urb_filled[MAX_RX_URBS];
 252         struct tasklet_struct unthrottle_tasklet;
 253 };
 254
 255 struct hso_device {
 256         union {
 257                 struct hso_serial *dev_serial;
 258                 struct hso_net *dev_net;
 259         } port_data;
 260
 261         u32 port_spec;
 262
 263         u8 is_active;
 264         u8 usb_gone;
 265         struct work_struct async_get_intf;
 266         struct work_struct async_put_intf;
 267
 268         struct usb_device *usb;
 269         struct usb_interface *interface;
 270
 271         struct device *dev;
 272         struct kref ref;
 273         struct mutex mutex;
 274 };
 275
 276 /* Type of interface */
 277 #define HSO_INTF_MASK           0xFF00
 278 #define HSO_INTF_MUX            0x0100
 279 #define HSO_INTF_BULK           0x0200
 280
 281 /* Type of port */
 282 #define HSO_PORT_MASK           0xFF
 283 #define HSO_PORT_NO_PORT        0x0
 284 #define HSO_PORT_CONTROL        0x1
 285 #define HSO_PORT_APP            0x2
 286 #define HSO_PORT_GPS            0x3
 287 #define HSO_PORT_PCSC           0x4
 288 #define HSO_PORT_APP2           0x5
 289 #define HSO_PORT_GPS_CONTROL    0x6
 290 #define HSO_PORT_MSD            0x7
 291 #define HSO_PORT_VOICE          0x8
 292 #define HSO_PORT_DIAG2          0x9
 293 #define HSO_PORT_DIAG           0x10
 294 #define HSO_PORT_MODEM          0x11
 295 #define HSO_PORT_NETWORK        0x12
 296
 297 /* Additional device info */
 298 #define HSO_INFO_MASK           0xFF000000
 299 #define HSO_INFO_CRC_BUG        0x01000000
 300
 301 /*****************************************************************************/
 302 /* Prototypes                                                                */
 303 /*****************************************************************************/
 304 /* Serial driver functions */
 305 static int hso_serial_tiocmset(struct tty_struct *tty,
 306                                unsigned int set, unsigned int clear);
 307 static void ctrl_callback(struct urb *urb);
 308 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
 309 static void hso_kick_transmit(struct hso_serial *serial);
 310 /* Helper functions */
 311 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
 312                                    struct usb_device *usb, gfp_t gfp);
 313 static void handle_usb_error(int status, const char *function,
 314                              struct hso_device *hso_dev);
 315 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
 316                                                   int type, int dir);
 317 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
 318 static void hso_free_interface(struct usb_interface *intf);
 319 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
 320 static int hso_stop_serial_device(struct hso_device *hso_dev);
 321 static int hso_start_net_device(struct hso_device *hso_dev);
 322 static void hso_free_shared_int(struct hso_shared_int *shared_int);
 323 static int hso_stop_net_device(struct hso_device *hso_dev);
 324 static void hso_serial_ref_free(struct kref *ref);
 325 static void hso_std_serial_read_bulk_callback(struct urb *urb);
 326 static int hso_mux_serial_read(struct hso_serial *serial);
 327 static void async_get_intf(struct work_struct *data);
 328 static void async_put_intf(struct work_struct *data);
 329 static int hso_put_activity(struct hso_device *hso_dev);
 330 static int hso_get_activity(struct hso_device *hso_dev);
 331 static void tiocmget_intr_callback(struct urb *urb);
 332 /*****************************************************************************/
 333 /* Helping functions                                                         */
 334 /*****************************************************************************/
 335
 336 /* #define DEBUG */
 337
 338 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
 339 {
 340         return hso_dev->port_data.dev_net;
 341 }
 342
 343 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
 344 {
 345         return hso_dev->port_data.dev_serial;
 346 }
 347
 348 /* Debugging functions */
 349 #ifdef DEBUG
 350 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
 351                      unsigned int len)
 352 {
 353         static char name[255];
 354
 355         sprintf(name, "hso[%d:%s]", line_count, func_name);
 356         print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
 357 }
 358
 359 #define DUMP(buf_, len_)        \
 360         dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
 361
 362 #define DUMP1(buf_, len_)                       \
 363         do {                                    \
 364                 if (0x01 & debug)               \
 365                         DUMP(buf_, len_);       \
 366         } while (0)
 367 #else
 368 #define DUMP(buf_, len_)
 369 #define DUMP1(buf_, len_)
 370 #endif
 371
 372 /* module parameters */
 373 static int debug;
 374 static int tty_major;
 375 static int disable_net;
 376
 377 /* driver info */
 378 static const char driver_name[] = "hso";
 379 static const char tty_filename[] = "ttyHS";
 380 static const char *version = __FILE__ ": " MOD_AUTHOR;
 381 /* the usb driver itself (registered in hso_init) */
 382 static struct usb_driver hso_driver;
 383 /* serial structures */
 384 static struct tty_driver *tty_drv;
 385 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
 386 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
 387 static spinlock_t serial_table_lock;
 388
 389 static const s32 default_port_spec[] = {
 390         HSO_INTF_MUX | HSO_PORT_NETWORK,
 391         HSO_INTF_BULK | HSO_PORT_DIAG,
 392         HSO_INTF_BULK | HSO_PORT_MODEM,
 393         0
 394 };
 395
 396 static const s32 icon321_port_spec[] = {
 397         HSO_INTF_MUX | HSO_PORT_NETWORK,
 398         HSO_INTF_BULK | HSO_PORT_DIAG2,
 399         HSO_INTF_BULK | HSO_PORT_MODEM,
 400         HSO_INTF_BULK | HSO_PORT_DIAG,
 401         0
 402 };
 403
 404 #define default_port_device(vendor, product)    \
 405         USB_DEVICE(vendor, product),    \
 406                 .driver_info = (kernel_ulong_t)default_port_spec
 407
 408 #define icon321_port_device(vendor, product)    \
 409         USB_DEVICE(vendor, product),    \
 410                 .driver_info = (kernel_ulong_t)icon321_port_spec
 411
 412 /* list of devices we support */
 413 static const struct usb_device_id hso_ids[] = {
 414         {default_port_device(0x0af0, 0x6711)},
 415         {default_port_device(0x0af0, 0x6731)},
 416         {default_port_device(0x0af0, 0x6751)},
 417         {default_port_device(0x0af0, 0x6771)},
 418         {default_port_device(0x0af0, 0x6791)},
 419         {default_port_device(0x0af0, 0x6811)},
 420         {default_port_device(0x0af0, 0x6911)},
 421         {default_port_device(0x0af0, 0x6951)},
 422         {default_port_device(0x0af0, 0x6971)},
 423         {default_port_device(0x0af0, 0x7011)},
 424         {default_port_device(0x0af0, 0x7031)},
 425         {default_port_device(0x0af0, 0x7051)},
 426         {default_port_device(0x0af0, 0x7071)},
 427         {default_port_device(0x0af0, 0x7111)},
 428         {default_port_device(0x0af0, 0x7211)},
 429         {default_port_device(0x0af0, 0x7251)},
 430         {default_port_device(0x0af0, 0x7271)},
 431         {default_port_device(0x0af0, 0x7311)},
 432         {default_port_device(0x0af0, 0xc031)},  /* Icon-Edge */
 433         {icon321_port_device(0x0af0, 0xd013)},  /* Module HSxPA */
 434         {icon321_port_device(0x0af0, 0xd031)},  /* Icon-321 */
 435         {icon321_port_device(0x0af0, 0xd033)},  /* Icon-322 */
 436         {USB_DEVICE(0x0af0, 0x7301)},           /* GE40x */
 437         {USB_DEVICE(0x0af0, 0x7361)},           /* GE40x */
 438         {USB_DEVICE(0x0af0, 0x7381)},           /* GE40x */
 439         {USB_DEVICE(0x0af0, 0x7401)},           /* GI 0401 */
 440         {USB_DEVICE(0x0af0, 0x7501)},           /* GTM 382 */
 441         {USB_DEVICE(0x0af0, 0x7601)},           /* GE40x */
 442         {USB_DEVICE(0x0af0, 0x7701)},
 443         {USB_DEVICE(0x0af0, 0x7706)},
 444         {USB_DEVICE(0x0af0, 0x7801)},
 445         {USB_DEVICE(0x0af0, 0x7901)},
 446         {USB_DEVICE(0x0af0, 0x7A01)},
 447         {USB_DEVICE(0x0af0, 0x7A05)},
 448         {USB_DEVICE(0x0af0, 0x8200)},
 449         {USB_DEVICE(0x0af0, 0x8201)},
 450         {USB_DEVICE(0x0af0, 0x8300)},
 451         {USB_DEVICE(0x0af0, 0x8302)},
 452         {USB_DEVICE(0x0af0, 0x8304)},
 453         {USB_DEVICE(0x0af0, 0x8400)},
 454         {USB_DEVICE(0x0af0, 0x8600)},
 455         {USB_DEVICE(0x0af0, 0x8800)},
 456         {USB_DEVICE(0x0af0, 0x8900)},
 457         {USB_DEVICE(0x0af0, 0x9000)},
 458         {USB_DEVICE(0x0af0, 0x9200)},           /* Option GTM671WFS */
 459         {USB_DEVICE(0x0af0, 0xd035)},
 460         {USB_DEVICE(0x0af0, 0xd055)},
 461         {USB_DEVICE(0x0af0, 0xd155)},
 462         {USB_DEVICE(0x0af0, 0xd255)},
 463         {USB_DEVICE(0x0af0, 0xd057)},
 464         {USB_DEVICE(0x0af0, 0xd157)},
 465         {USB_DEVICE(0x0af0, 0xd257)},
 466         {USB_DEVICE(0x0af0, 0xd357)},
 467         {USB_DEVICE(0x0af0, 0xd058)},
 468         {USB_DEVICE(0x0af0, 0xc100)},
 469         {}
 470 };
 471 MODULE_DEVICE_TABLE(usb, hso_ids);
 472
 473 /* Sysfs attribute */
 474 static ssize_t hso_sysfs_show_porttype(struct device *dev,
 475                                        struct device_attribute *attr,
 476                                        char *buf)
 477 {
 478         struct hso_device *hso_dev = dev_get_drvdata(dev);
 479         char *port_name;
 480
 481         if (!hso_dev)
 482                 return 0;
 483
 484         switch (hso_dev->port_spec & HSO_PORT_MASK) {
 485         case HSO_PORT_CONTROL:
 486                 port_name = "Control";
 487                 break;
 488         case HSO_PORT_APP:
 489                 port_name = "Application";
 490                 break;
 491         case HSO_PORT_APP2:
 492                 port_name = "Application2";
 493                 break;
 494         case HSO_PORT_GPS:
 495                 port_name = "GPS";
 496                 break;
 497         case HSO_PORT_GPS_CONTROL:
 498                 port_name = "GPS Control";
 499                 break;
 500         case HSO_PORT_PCSC:
 501                 port_name = "PCSC";
 502                 break;
 503         case HSO_PORT_DIAG:
 504                 port_name = "Diagnostic";
 505                 break;
 506         case HSO_PORT_DIAG2:
 507                 port_name = "Diagnostic2";
 508                 break;
 509         case HSO_PORT_MODEM:
 510                 port_name = "Modem";
 511                 break;
 512         case HSO_PORT_NETWORK:
 513                 port_name = "Network";
 514                 break;
 515         default:
 516                 port_name = "Unknown";
 517                 break;
 518         }
 519
 520         return sprintf(buf, "%s\n", port_name);
 521 }
 522 static DEVICE_ATTR(hsotype, 0444, hso_sysfs_show_porttype, NULL);
 523
 524 static struct attribute *hso_serial_dev_attrs[] = {
 525         &dev_attr_hsotype.attr,
 526         NULL
 527 };
 528
 529 ATTRIBUTE_GROUPS(hso_serial_dev);
 530
 531 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
 532 {
 533         int idx;
 534
 535         for (idx = 0; idx < serial->num_rx_urbs; idx++)
 536                 if (serial->rx_urb[idx] == urb)
 537                         return idx;
 538         dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
 539         return -1;
 540 }
 541
 542 /* converts mux value to a port spec value */
 543 static u32 hso_mux_to_port(int mux)
 544 {
 545         u32 result;
 546
 547         switch (mux) {
 548         case 0x1:
 549                 result = HSO_PORT_CONTROL;
 550                 break;
 551         case 0x2:
 552                 result = HSO_PORT_APP;
 553                 break;
 554         case 0x4:
 555                 result = HSO_PORT_PCSC;
 556                 break;
 557         case 0x8:
 558                 result = HSO_PORT_GPS;
 559                 break;
 560         case 0x10:
 561                 result = HSO_PORT_APP2;
 562                 break;
 563         default:
 564                 result = HSO_PORT_NO_PORT;
 565         }
 566         return result;
 567 }
 568
 569 /* converts port spec value to a mux value */
 570 static u32 hso_port_to_mux(int port)
 571 {
 572         u32 result;
 573
 574         switch (port & HSO_PORT_MASK) {
 575         case HSO_PORT_CONTROL:
 576                 result = 0x0;
 577                 break;
 578         case HSO_PORT_APP:
 579                 result = 0x1;
 580                 break;
 581         case HSO_PORT_PCSC:
 582                 result = 0x2;
 583                 break;
 584         case HSO_PORT_GPS:
 585                 result = 0x3;
 586                 break;
 587         case HSO_PORT_APP2:
 588                 result = 0x4;
 589                 break;
 590         default:
 591                 result = 0x0;
 592         }
 593         return result;
 594 }
 595
 596 static struct hso_serial *get_serial_by_shared_int_and_type(
 597                                         struct hso_shared_int *shared_int,
 598                                         int mux)
 599 {
 600         int i, port;
 601
 602         port = hso_mux_to_port(mux);
 603
 604         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
 605                 if (serial_table[i] &&
 606                     (dev2ser(serial_table[i])->shared_int == shared_int) &&
 607                     ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
 608                         return dev2ser(serial_table[i]);
 609                 }
 610         }
 611
 612         return NULL;
 613 }
 614
 615 static struct hso_serial *get_serial_by_index(unsigned index)
 616 {
 617         struct hso_serial *serial = NULL;
 618         unsigned long flags;
 619
 620         spin_lock_irqsave(&serial_table_lock, flags);
 621         if (serial_table[index])
 622                 serial = dev2ser(serial_table[index]);
 623         spin_unlock_irqrestore(&serial_table_lock, flags);
 624
 625         return serial;
 626 }
 627
 628 static int get_free_serial_index(void)
 629 {
 630         int index;
 631         unsigned long flags;
 632
 633         spin_lock_irqsave(&serial_table_lock, flags);
 634         for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
 635                 if (serial_table[index] == NULL) {
 636                         spin_unlock_irqrestore(&serial_table_lock, flags);
 637                         return index;
 638                 }
 639         }
 640         spin_unlock_irqrestore(&serial_table_lock, flags);
 641
 642         pr_err("%s: no free serial devices in table\n", __func__);
 643         return -1;
 644 }
 645
 646 static void set_serial_by_index(unsigned index, struct hso_serial *serial)
 647 {
 648         unsigned long flags;
 649
 650         spin_lock_irqsave(&serial_table_lock, flags);
 651         if (serial)
 652                 serial_table[index] = serial->parent;
 653         else
 654                 serial_table[index] = NULL;
 655         spin_unlock_irqrestore(&serial_table_lock, flags);
 656 }
 657
 658 static void handle_usb_error(int status, const char *function,
 659                              struct hso_device *hso_dev)
 660 {
 661         char *explanation;
 662
 663         switch (status) {
 664         case -ENODEV:
 665                 explanation = "no device";
 666                 break;
 667         case -ENOENT:
 668                 explanation = "endpoint not enabled";
 669                 break;
 670         case -EPIPE:
 671                 explanation = "endpoint stalled";
 672                 break;
 673         case -ENOSPC:
 674                 explanation = "not enough bandwidth";
 675                 break;
 676         case -ESHUTDOWN:
 677                 explanation = "device disabled";
 678                 break;
 679         case -EHOSTUNREACH:
 680                 explanation = "device suspended";
 681                 break;
 682         case -EINVAL:
 683         case -EAGAIN:
 684         case -EFBIG:
 685         case -EMSGSIZE:
 686                 explanation = "internal error";
 687                 break;
 688         case -EILSEQ:
 689         case -EPROTO:
 690         case -ETIME:
 691         case -ETIMEDOUT:
 692                 explanation = "protocol error";
 693                 if (hso_dev)
 694                         usb_queue_reset_device(hso_dev->interface);
 695                 break;
 696         default:
 697                 explanation = "unknown status";
 698                 break;
 699         }
 700
 701         /* log a meaningful explanation of an USB status */
 702         hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
 703                 function, explanation, status);
 704 }
 705
 706 /* Network interface functions */
 707
 708 /* called when net interface is brought up by ifconfig */
 709 static int hso_net_open(struct net_device *net)
 710 {
 711         struct hso_net *odev = netdev_priv(net);
 712         unsigned long flags = 0;
 713
 714         if (!odev) {
 715                 dev_err(&net->dev, "No net device !\n");
 716                 return -ENODEV;
 717         }
 718
 719         odev->skb_tx_buf = NULL;
 720
 721         /* setup environment */
 722         spin_lock_irqsave(&odev->net_lock, flags);
 723         odev->rx_parse_state = WAIT_IP;
 724         odev->rx_buf_size = 0;
 725         odev->rx_buf_missing = sizeof(struct iphdr);
 726         spin_unlock_irqrestore(&odev->net_lock, flags);
 727
 728         /* We are up and running. */
 729         set_bit(HSO_NET_RUNNING, &odev->flags);
 730         hso_start_net_device(odev->parent);
 731
 732         /* Tell the kernel we are ready to start receiving from it */
 733         netif_start_queue(net);
 734
 735         return 0;
 736 }
 737
 738 /* called when interface is brought down by ifconfig */
 739 static int hso_net_close(struct net_device *net)
 740 {
 741         struct hso_net *odev = netdev_priv(net);
 742
 743         /* we don't need the queue anymore */
 744         netif_stop_queue(net);
 745         /* no longer running */
 746         clear_bit(HSO_NET_RUNNING, &odev->flags);
 747
 748         hso_stop_net_device(odev->parent);
 749
 750         /* done */
 751         return 0;
 752 }
 753
 754 /* USB tells is xmit done, we should start the netqueue again */
 755 static void write_bulk_callback(struct urb *urb)
 756 {
 757         struct hso_net *odev = urb->context;
 758         int status = urb->status;
 759
 760         /* Sanity check */
 761         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 762                 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
 763                 return;
 764         }
 765
 766         /* Do we still have a valid kernel network device? */
 767         if (!netif_device_present(odev->net)) {
 768                 dev_err(&urb->dev->dev, "%s: net device not present\n",
 769                         __func__);
 770                 return;
 771         }
 772
 773         /* log status, but don't act on it, we don't need to resubmit anything
 774          * anyhow */
 775         if (status)
 776                 handle_usb_error(status, __func__, odev->parent);
 777
 778         hso_put_activity(odev->parent);
 779
 780         /* Tell the network interface we are ready for another frame */
 781         netif_wake_queue(odev->net);
 782 }
 783
 784 /* called by kernel when we need to transmit a packet */
 785 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
 786                                             struct net_device *net)
 787 {
 788         struct hso_net *odev = netdev_priv(net);
 789         int result;
 790
 791         /* Tell the kernel, "No more frames 'til we are done with this one." */
 792         netif_stop_queue(net);
 793         if (hso_get_activity(odev->parent) == -EAGAIN) {
 794                 odev->skb_tx_buf = skb;
 795                 return NETDEV_TX_OK;
 796         }
 797
 798         /* log if asked */
 799         DUMP1(skb->data, skb->len);
 800         /* Copy it from kernel memory to OUR memory */
 801         memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
 802         hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
 803
 804         /* Fill in the URB for shipping it out. */
 805         usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
 806                           odev->parent->usb,
 807                           usb_sndbulkpipe(odev->parent->usb,
 808                                           odev->out_endp->
 809                                           bEndpointAddress & 0x7F),
 810                           odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
 811                           odev);
 812
 813         /* Deal with the Zero Length packet problem, I hope */
 814         odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
 815
 816         /* Send the URB on its merry way. */
 817         result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
 818         if (result) {
 819                 dev_warn(&odev->parent->interface->dev,
 820                         "failed mux_bulk_tx_urb %d\n", result);
 821                 net->stats.tx_errors++;
 822                 netif_start_queue(net);
 823         } else {
 824                 net->stats.tx_packets++;
 825                 net->stats.tx_bytes += skb->len;
 826         }
 827         dev_kfree_skb(skb);
 828         /* we're done */
 829         return NETDEV_TX_OK;
 830 }
 831
 832 static const struct ethtool_ops ops = {
 833         .get_link = ethtool_op_get_link
 834 };
 835
 836 /* called when a packet did not ack after watchdogtimeout */
 837 static void hso_net_tx_timeout(struct net_device *net)
 838 {
 839         struct hso_net *odev = netdev_priv(net);
 840
 841         if (!odev)
 842                 return;
 843
 844         /* Tell syslog we are hosed. */
 845         dev_warn(&net->dev, "Tx timed out.\n");
 846
 847         /* Tear the waiting frame off the list */
 848         if (odev->mux_bulk_tx_urb &&
 849             (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
 850                 usb_unlink_urb(odev->mux_bulk_tx_urb);
 851
 852         /* Update statistics */
 853         net->stats.tx_errors++;
 854 }
 855
 856 /* make a real packet from the received USB buffer */
 857 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
 858                         unsigned int count, unsigned char is_eop)
 859 {
 860         unsigned short temp_bytes;
 861         unsigned short buffer_offset = 0;
 862         unsigned short frame_len;
 863
 864         /* log if needed */
 865         hso_dbg(0x1, "Rx %d bytes\n", count);
 866         DUMP(ip_pkt, min(128, (int)count));
 867
 868         while (count) {
 869                 switch (odev->rx_parse_state) {
 870                 case WAIT_IP:
 871                         /* waiting for IP header. */
 872                         /* wanted bytes - size of ip header */
 873                         temp_bytes =
 874                             (count <
 875                              odev->rx_buf_missing) ? count : odev->
 876                             rx_buf_missing;
 877
 878                         memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
 879                                odev->rx_buf_size, ip_pkt + buffer_offset,
 880                                temp_bytes);
 881
 882                         odev->rx_buf_size += temp_bytes;
 883                         buffer_offset += temp_bytes;
 884                         odev->rx_buf_missing -= temp_bytes;
 885                         count -= temp_bytes;
 886
 887                         if (!odev->rx_buf_missing) {
 888                                 /* header is complete allocate an sk_buffer and
 889                                  * continue to WAIT_DATA */
 890                                 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
 891
 892                                 if ((frame_len > DEFAULT_MRU) ||
 893                                     (frame_len < sizeof(struct iphdr))) {
 894                                         dev_err(&odev->net->dev,
 895                                                 "Invalid frame (%d) length\n",
 896                                                 frame_len);
 897                                         odev->rx_parse_state = WAIT_SYNC;
 898                                         continue;
 899                                 }
 900                                 /* Allocate an sk_buff */
 901                                 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
 902                                                                     frame_len);
 903                                 if (!odev->skb_rx_buf) {
 904                                         /* We got no receive buffer. */
 905                                         hso_dbg(0x1, "could not allocate memory\n");
 906                                         odev->rx_parse_state = WAIT_SYNC;
 907                                         continue;
 908                                 }
 909
 910                                 /* Copy what we got so far. make room for iphdr
 911                                  * after tail. */
 912                                 skb_put_data(odev->skb_rx_buf,
 913                                              (char *)&(odev->rx_ip_hdr),
 914                                              sizeof(struct iphdr));
 915
 916                                 /* ETH_HLEN */
 917                                 odev->rx_buf_size = sizeof(struct iphdr);
 918
 919                                 /* Filip actually use .tot_len */
 920                                 odev->rx_buf_missing =
 921                                     frame_len - sizeof(struct iphdr);
 922                                 odev->rx_parse_state = WAIT_DATA;
 923                         }
 924                         break;
 925
 926                 case WAIT_DATA:
 927                         temp_bytes = (count < odev->rx_buf_missing)
 928                                         ? count : odev->rx_buf_missing;
 929
 930                         /* Copy the rest of the bytes that are left in the
 931                          * buffer into the waiting sk_buf. */
 932                         /* Make room for temp_bytes after tail. */
 933                         skb_put_data(odev->skb_rx_buf,
 934                                      ip_pkt + buffer_offset,
 935                                      temp_bytes);
 936
 937                         odev->rx_buf_missing -= temp_bytes;
 938                         count -= temp_bytes;
 939                         buffer_offset += temp_bytes;
 940                         odev->rx_buf_size += temp_bytes;
 941                         if (!odev->rx_buf_missing) {
 942                                 /* Packet is complete. Inject into stack. */
 943                                 /* We have IP packet here */
 944                                 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
 945                                 skb_reset_mac_header(odev->skb_rx_buf);
 946
 947                                 /* Ship it off to the kernel */
 948                                 netif_rx(odev->skb_rx_buf);
 949                                 /* No longer our buffer. */
 950                                 odev->skb_rx_buf = NULL;
 951
 952                                 /* update out statistics */
 953                                 odev->net->stats.rx_packets++;
 954
 955                                 odev->net->stats.rx_bytes += odev->rx_buf_size;
 956
 957                                 odev->rx_buf_size = 0;
 958                                 odev->rx_buf_missing = sizeof(struct iphdr);
 959                                 odev->rx_parse_state = WAIT_IP;
 960                         }
 961                         break;
 962
 963                 case WAIT_SYNC:
 964                         hso_dbg(0x1, " W_S\n");
 965                         count = 0;
 966                         break;
 967                 default:
 968                         hso_dbg(0x1, "\n");
 969                         count--;
 970                         break;
 971                 }
 972         }
 973
 974         /* Recovery mechanism for WAIT_SYNC state. */
 975         if (is_eop) {
 976                 if (odev->rx_parse_state == WAIT_SYNC) {
 977                         odev->rx_parse_state = WAIT_IP;
 978                         odev->rx_buf_size = 0;
 979                         odev->rx_buf_missing = sizeof(struct iphdr);
 980                 }
 981         }
 982 }
 983
 984 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
 985 {
 986         static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
 987         u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
 988
 989         if (((rest == 5) || (rest == 6)) &&
 990             !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
 991                     crc_check, 4)) {
 992                 urb->actual_length -= 4;
 993         }
 994 }
 995
 996 /* Moving data from usb to kernel (in interrupt state) */
 997 static void read_bulk_callback(struct urb *urb)
 998 {
 999         struct hso_net *odev = urb->context;
1000         struct net_device *net;
1001         int result;
1002         unsigned long flags;
1003         int status = urb->status;
1004
1005         /* is al ok?  (Filip: Who's Al ?) */
1006         if (status) {
1007                 handle_usb_error(status, __func__, odev->parent);
1008                 return;
1009         }
1010
1011         /* Sanity check */
1012         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
1013                 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
1014                 return;
1015         }
1016         usb_mark_last_busy(urb->dev);
1017
1018         net = odev->net;
1019
1020         if (!netif_device_present(net)) {
1021                 /* Somebody killed our network interface... */
1022                 return;
1023         }
1024
1025         if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1026                 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1027
1028         /* do we even have a packet? */
1029         if (urb->actual_length) {
1030                 /* Handle the IP stream, add header and push it onto network
1031                  * stack if the packet is complete. */
1032                 spin_lock_irqsave(&odev->net_lock, flags);
1033                 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1034                             (urb->transfer_buffer_length >
1035                              urb->actual_length) ? 1 : 0);
1036                 spin_unlock_irqrestore(&odev->net_lock, flags);
1037         }
1038
1039         /* We are done with this URB, resubmit it. Prep the USB to wait for
1040          * another frame. Reuse same as received. */
1041         usb_fill_bulk_urb(urb,
1042                           odev->parent->usb,
1043                           usb_rcvbulkpipe(odev->parent->usb,
1044                                           odev->in_endp->
1045                                           bEndpointAddress & 0x7F),
1046                           urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1047                           read_bulk_callback, odev);
1048
1049         /* Give this to the USB subsystem so it can tell us when more data
1050          * arrives. */
1051         result = usb_submit_urb(urb, GFP_ATOMIC);
1052         if (result)
1053                 dev_warn(&odev->parent->interface->dev,
1054                          "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1055                          result);
1056 }
1057
1058 /* Serial driver functions */
1059
1060 static void hso_init_termios(struct ktermios *termios)
1061 {
1062         /*
1063          * The default requirements for this device are:
1064          */
1065         termios->c_iflag &=
1066                 ~(IGNBRK        /* disable ignore break */
1067                 | BRKINT        /* disable break causes interrupt */
1068                 | PARMRK        /* disable mark parity errors */
1069                 | ISTRIP        /* disable clear high bit of input characters */
1070                 | INLCR         /* disable translate NL to CR */
1071                 | IGNCR         /* disable ignore CR */
1072                 | ICRNL         /* disable translate CR to NL */
1073                 | IXON);        /* disable enable XON/XOFF flow control */
1074
1075         /* disable postprocess output characters */
1076         termios->c_oflag &= ~OPOST;
1077
1078         termios->c_lflag &=
1079                 ~(ECHO          /* disable echo input characters */
1080                 | ECHONL        /* disable echo new line */
1081                 | ICANON        /* disable erase, kill, werase, and rprnt
1082                                    special characters */
1083                 | ISIG          /* disable interrupt, quit, and suspend special
1084                                    characters */
1085                 | IEXTEN);      /* disable non-POSIX special characters */
1086
1087         termios->c_cflag &=
1088                 ~(CSIZE         /* no size */
1089                 | PARENB        /* disable parity bit */
1090                 | CBAUD         /* clear current baud rate */
1091                 | CBAUDEX);     /* clear current buad rate */
1092
1093         termios->c_cflag |= CS8;        /* character size 8 bits */
1094
1095         /* baud rate 115200 */
1096         tty_termios_encode_baud_rate(termios, 115200, 115200);
1097 }
1098
1099 static void _hso_serial_set_termios(struct tty_struct *tty,
1100                                     struct ktermios *old)
1101 {
1102         struct hso_serial *serial = tty->driver_data;
1103
1104         if (!serial) {
1105                 pr_err("%s: no tty structures", __func__);
1106                 return;
1107         }
1108
1109         hso_dbg(0x8, "port %d\n", serial->minor);
1110
1111         /*
1112          *      Fix up unsupported bits
1113          */
1114         tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1115
1116         tty->termios.c_cflag &=
1117                 ~(CSIZE         /* no size */
1118                 | PARENB        /* disable parity bit */
1119                 | CBAUD         /* clear current baud rate */
1120                 | CBAUDEX);     /* clear current buad rate */
1121
1122         tty->termios.c_cflag |= CS8;    /* character size 8 bits */
1123
1124         /* baud rate 115200 */
1125         tty_encode_baud_rate(tty, 115200, 115200);
1126 }
1127
1128 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1129 {
1130         int result;
1131         /* We are done with this URB, resubmit it. Prep the USB to wait for
1132          * another frame */
1133         usb_fill_bulk_urb(urb, serial->parent->usb,
1134                           usb_rcvbulkpipe(serial->parent->usb,
1135                                           serial->in_endp->
1136                                           bEndpointAddress & 0x7F),
1137                           urb->transfer_buffer, serial->rx_data_length,
1138                           hso_std_serial_read_bulk_callback, serial);
1139         /* Give this to the USB subsystem so it can tell us when more data
1140          * arrives. */
1141         result = usb_submit_urb(urb, GFP_ATOMIC);
1142         if (result) {
1143                 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1144                         __func__, result);
1145         }
1146 }
1147
1148
1149
1150
1151 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1152 {
1153         int count;
1154         struct urb *curr_urb;
1155
1156         while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1157                 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1158                 count = put_rxbuf_data(curr_urb, serial);
1159                 if (count == -1)
1160                         return;
1161                 if (count == 0) {
1162                         serial->curr_rx_urb_idx++;
1163                         if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1164                                 serial->curr_rx_urb_idx = 0;
1165                         hso_resubmit_rx_bulk_urb(serial, curr_urb);
1166                 }
1167         }
1168 }
1169
1170 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1171 {
1172         int count = 0;
1173         struct urb *urb;
1174
1175         urb = serial->rx_urb[0];
1176         if (serial->port.count > 0) {
1177                 count = put_rxbuf_data(urb, serial);
1178                 if (count == -1)
1179                         return;
1180         }
1181         /* Re issue a read as long as we receive data. */
1182
1183         if (count == 0 && ((urb->actual_length != 0) ||
1184                            (serial->rx_state == RX_PENDING))) {
1185                 serial->rx_state = RX_SENT;
1186                 hso_mux_serial_read(serial);
1187         } else
1188                 serial->rx_state = RX_IDLE;
1189 }
1190
1191
1192 /* read callback for Diag and CS port */
1193 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1194 {
1195         struct hso_serial *serial = urb->context;
1196         int status = urb->status;
1197         unsigned long flags;
1198
1199         hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1200
1201         /* sanity check */
1202         if (!serial) {
1203                 hso_dbg(0x1, "serial == NULL\n");
1204                 return;
1205         }
1206         if (status) {
1207                 handle_usb_error(status, __func__, serial->parent);
1208                 return;
1209         }
1210
1211         hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1212         DUMP1(urb->transfer_buffer, urb->actual_length);
1213
1214         /* Anyone listening? */
1215         if (serial->port.count == 0)
1216                 return;
1217
1218         if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1219                 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1220         /* Valid data, handle RX data */
1221         spin_lock_irqsave(&serial->serial_lock, flags);
1222         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1223         put_rxbuf_data_and_resubmit_bulk_urb(serial);
1224         spin_unlock_irqrestore(&serial->serial_lock, flags);
1225 }
1226
1227 /*
1228  * This needs to be a tasklet otherwise we will
1229  * end up recursively calling this function.
1230  */
1231 static void hso_unthrottle_tasklet(struct hso_serial *serial)
1232 {
1233         unsigned long flags;
1234
1235         spin_lock_irqsave(&serial->serial_lock, flags);
1236         if ((serial->parent->port_spec & HSO_INTF_MUX))
1237                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1238         else
1239                 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1240         spin_unlock_irqrestore(&serial->serial_lock, flags);
1241 }
1242
1243 static  void hso_unthrottle(struct tty_struct *tty)
1244 {
1245         struct hso_serial *serial = tty->driver_data;
1246
1247         tasklet_hi_schedule(&serial->unthrottle_tasklet);
1248 }
1249
1250 /* open the requested serial port */
1251 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1252 {
1253         struct hso_serial *serial = get_serial_by_index(tty->index);
1254         int result;
1255
1256         /* sanity check */
1257         if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1258                 WARN_ON(1);
1259                 tty->driver_data = NULL;
1260                 hso_dbg(0x1, "Failed to open port\n");
1261                 return -ENODEV;
1262         }
1263
1264         mutex_lock(&serial->parent->mutex);
1265         result = usb_autopm_get_interface(serial->parent->interface);
1266         if (result < 0)
1267                 goto err_out;
1268
1269         hso_dbg(0x1, "Opening %d\n", serial->minor);
1270
1271         /* setup */
1272         tty->driver_data = serial;
1273         tty_port_tty_set(&serial->port, tty);
1274
1275         /* check for port already opened, if not set the termios */
1276         serial->port.count++;
1277         if (serial->port.count == 1) {
1278                 serial->rx_state = RX_IDLE;
1279                 /* Force default termio settings */
1280                 _hso_serial_set_termios(tty, NULL);
1281                 tasklet_init(&serial->unthrottle_tasklet,
1282                              (void (*)(unsigned long))hso_unthrottle_tasklet,
1283                              (unsigned long)serial);
1284                 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1285                 if (result) {
1286                         hso_stop_serial_device(serial->parent);
1287                         serial->port.count--;
1288                 } else {
1289                         kref_get(&serial->parent->ref);
1290                 }
1291         } else {
1292                 hso_dbg(0x1, "Port was already open\n");
1293         }
1294
1295         usb_autopm_put_interface(serial->parent->interface);
1296
1297         /* done */
1298         if (result)
1299                 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1300 err_out:
1301         mutex_unlock(&serial->parent->mutex);
1302         return result;
1303 }
1304
1305 /* close the requested serial port */
1306 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1307 {
1308         struct hso_serial *serial = tty->driver_data;
1309         u8 usb_gone;
1310
1311         hso_dbg(0x1, "Closing serial port\n");
1312
1313         /* Open failed, no close cleanup required */
1314         if (serial == NULL)
1315                 return;
1316
1317         mutex_lock(&serial->parent->mutex);
1318         usb_gone = serial->parent->usb_gone;
1319
1320         if (!usb_gone)
1321                 usb_autopm_get_interface(serial->parent->interface);
1322
1323         /* reset the rts and dtr */
1324         /* do the actual close */
1325         serial->port.count--;
1326
1327         if (serial->port.count <= 0) {
1328                 serial->port.count = 0;
1329                 tty_port_tty_set(&serial->port, NULL);
1330                 if (!usb_gone)
1331                         hso_stop_serial_device(serial->parent);
1332                 tasklet_kill(&serial->unthrottle_tasklet);
1333         }
1334
1335         if (!usb_gone)
1336                 usb_autopm_put_interface(serial->parent->interface);
1337
1338         mutex_unlock(&serial->parent->mutex);
1339 }
1340
1341 /* close the requested serial port */
1342 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1343                             int count)
1344 {
1345         struct hso_serial *serial = tty->driver_data;
1346         int space, tx_bytes;
1347         unsigned long flags;
1348
1349         /* sanity check */
1350         if (serial == NULL) {
1351                 pr_err("%s: serial is NULL\n", __func__);
1352                 return -ENODEV;
1353         }
1354
1355         spin_lock_irqsave(&serial->serial_lock, flags);
1356
1357         space = serial->tx_data_length - serial->tx_buffer_count;
1358         tx_bytes = (count < space) ? count : space;
1359
1360         if (!tx_bytes)
1361                 goto out;
1362
1363         memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1364         serial->tx_buffer_count += tx_bytes;
1365
1366 out:
1367         spin_unlock_irqrestore(&serial->serial_lock, flags);
1368
1369         hso_kick_transmit(serial);
1370         /* done */
1371         return tx_bytes;
1372 }
1373
1374 /* how much room is there for writing */
1375 static int hso_serial_write_room(struct tty_struct *tty)
1376 {
1377         struct hso_serial *serial = tty->driver_data;
1378         int room;
1379         unsigned long flags;
1380
1381         spin_lock_irqsave(&serial->serial_lock, flags);
1382         room = serial->tx_data_length - serial->tx_buffer_count;
1383         spin_unlock_irqrestore(&serial->serial_lock, flags);
1384
1385         /* return free room */
1386         return room;
1387 }
1388
1389 static void hso_serial_cleanup(struct tty_struct *tty)
1390 {
1391         struct hso_serial *serial = tty->driver_data;
1392
1393         if (!serial)
1394                 return;
1395
1396         kref_put(&serial->parent->ref, hso_serial_ref_free);
1397 }
1398
1399 /* setup the term */
1400 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1401 {
1402         struct hso_serial *serial = tty->driver_data;
1403         unsigned long flags;
1404
1405         if (old)
1406                 hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n",
1407                         tty->termios.c_cflag, old->c_cflag);
1408
1409         /* the actual setup */
1410         spin_lock_irqsave(&serial->serial_lock, flags);
1411         if (serial->port.count)
1412                 _hso_serial_set_termios(tty, old);
1413         else
1414                 tty->termios = *old;
1415         spin_unlock_irqrestore(&serial->serial_lock, flags);
1416
1417         /* done */
1418 }
1419
1420 /* how many characters in the buffer */
1421 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1422 {
1423         struct hso_serial *serial = tty->driver_data;
1424         int chars;
1425         unsigned long flags;
1426
1427         /* sanity check */
1428         if (serial == NULL)
1429                 return 0;
1430
1431         spin_lock_irqsave(&serial->serial_lock, flags);
1432         chars = serial->tx_buffer_count;
1433         spin_unlock_irqrestore(&serial->serial_lock, flags);
1434
1435         return chars;
1436 }
1437 static int tiocmget_submit_urb(struct hso_serial *serial,
1438                                struct hso_tiocmget *tiocmget,
1439                                struct usb_device *usb)
1440 {
1441         int result;
1442
1443         if (serial->parent->usb_gone)
1444                 return -ENODEV;
1445         usb_fill_int_urb(tiocmget->urb, usb,
1446                          usb_rcvintpipe(usb,
1447                                         tiocmget->endp->
1448                                         bEndpointAddress & 0x7F),
1449                          &tiocmget->serial_state_notification,
1450                          sizeof(struct hso_serial_state_notification),
1451                          tiocmget_intr_callback, serial,
1452                          tiocmget->endp->bInterval);
1453         result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1454         if (result) {
1455                 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1456                          result);
1457         }
1458         return result;
1459
1460 }
1461
1462 static void tiocmget_intr_callback(struct urb *urb)
1463 {
1464         struct hso_serial *serial = urb->context;
1465         struct hso_tiocmget *tiocmget;
1466         int status = urb->status;
1467         u16 UART_state_bitmap, prev_UART_state_bitmap;
1468         struct uart_icount *icount;
1469         struct hso_serial_state_notification *serial_state_notification;
1470         struct usb_device *usb;
1471         struct usb_interface *interface;
1472         int if_num;
1473
1474         /* Sanity checks */
1475         if (!serial)
1476                 return;
1477         if (status) {
1478                 handle_usb_error(status, __func__, serial->parent);
1479                 return;
1480         }
1481
1482         /* tiocmget is only supported on HSO_PORT_MODEM */
1483         tiocmget = serial->tiocmget;
1484         if (!tiocmget)
1485                 return;
1486         BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1487
1488         usb = serial->parent->usb;
1489         interface = serial->parent->interface;
1490
1491         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1492
1493         /* wIndex should be the USB interface number of the port to which the
1494          * notification applies, which should always be the Modem port.
1495          */
1496         serial_state_notification = &tiocmget->serial_state_notification;
1497         if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1498             serial_state_notification->bNotification != B_NOTIFICATION ||
1499             le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1500             le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1501             le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1502                 dev_warn(&usb->dev,
1503                          "hso received invalid serial state notification\n");
1504                 DUMP(serial_state_notification,
1505                      sizeof(struct hso_serial_state_notification));
1506         } else {
1507                 unsigned long flags;
1508
1509                 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1510                                                 UART_state_bitmap);
1511                 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1512                 icount = &tiocmget->icount;
1513                 spin_lock_irqsave(&serial->serial_lock, flags);
1514                 if ((UART_state_bitmap & B_OVERRUN) !=
1515                    (prev_UART_state_bitmap & B_OVERRUN))
1516                         icount->parity++;
1517                 if ((UART_state_bitmap & B_PARITY) !=
1518                    (prev_UART_state_bitmap & B_PARITY))
1519                         icount->parity++;
1520                 if ((UART_state_bitmap & B_FRAMING) !=
1521                    (prev_UART_state_bitmap & B_FRAMING))
1522                         icount->frame++;
1523                 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1524                    !(prev_UART_state_bitmap & B_RING_SIGNAL))
1525                         icount->rng++;
1526                 if ((UART_state_bitmap & B_BREAK) !=
1527                    (prev_UART_state_bitmap & B_BREAK))
1528                         icount->brk++;
1529                 if ((UART_state_bitmap & B_TX_CARRIER) !=
1530                    (prev_UART_state_bitmap & B_TX_CARRIER))
1531                         icount->dsr++;
1532                 if ((UART_state_bitmap & B_RX_CARRIER) !=
1533                    (prev_UART_state_bitmap & B_RX_CARRIER))
1534                         icount->dcd++;
1535                 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1536                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1537                 tiocmget->intr_completed = 1;
1538                 wake_up_interruptible(&tiocmget->waitq);
1539         }
1540         memset(serial_state_notification, 0,
1541                sizeof(struct hso_serial_state_notification));
1542         tiocmget_submit_urb(serial,
1543                             tiocmget,
1544                             serial->parent->usb);
1545 }
1546
1547 /*
1548  * next few functions largely stolen from drivers/serial/serial_core.c
1549  */
1550 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1551  * - mask passed in arg for lines of interest
1552  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1553  * Caller should use TIOCGICOUNT to see which one it was
1554  */
1555 static int
1556 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1557 {
1558         DECLARE_WAITQUEUE(wait, current);
1559         struct uart_icount cprev, cnow;
1560         struct hso_tiocmget  *tiocmget;
1561         int ret;
1562
1563         tiocmget = serial->tiocmget;
1564         if (!tiocmget)
1565                 return -ENOENT;
1566         /*
1567          * note the counters on entry
1568          */
1569         spin_lock_irq(&serial->serial_lock);
1570         memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1571         spin_unlock_irq(&serial->serial_lock);
1572         add_wait_queue(&tiocmget->waitq, &wait);
1573         for (;;) {
1574                 spin_lock_irq(&serial->serial_lock);
1575                 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1576                 spin_unlock_irq(&serial->serial_lock);
1577                 set_current_state(TASK_INTERRUPTIBLE);
1578                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1579                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1580                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
1581                         ret = 0;
1582                         break;
1583                 }
1584                 schedule();
1585                 /* see if a signal did it */
1586                 if (signal_pending(current)) {
1587                         ret = -ERESTARTSYS;
1588                         break;
1589                 }
1590                 cprev = cnow;
1591         }
1592         __set_current_state(TASK_RUNNING);
1593         remove_wait_queue(&tiocmget->waitq, &wait);
1594
1595         return ret;
1596 }
1597
1598 /*
1599  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1600  * Return: write counters to the user passed counter struct
1601  * NB: both 1->0 and 0->1 transitions are counted except for
1602  *     RI where only 0->1 is counted.
1603  */
1604 static int hso_get_count(struct tty_struct *tty,
1605                   struct serial_icounter_struct *icount)
1606 {
1607         struct uart_icount cnow;
1608         struct hso_serial *serial = tty->driver_data;
1609         struct hso_tiocmget  *tiocmget = serial->tiocmget;
1610
1611         memset(icount, 0, sizeof(struct serial_icounter_struct));
1612
1613         if (!tiocmget)
1614                  return -ENOENT;
1615         spin_lock_irq(&serial->serial_lock);
1616         memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1617         spin_unlock_irq(&serial->serial_lock);
1618
1619         icount->cts         = cnow.cts;
1620         icount->dsr         = cnow.dsr;
1621         icount->rng         = cnow.rng;
1622         icount->dcd         = cnow.dcd;
1623         icount->rx          = cnow.rx;
1624         icount->tx          = cnow.tx;
1625         icount->frame       = cnow.frame;
1626         icount->overrun     = cnow.overrun;
1627         icount->parity      = cnow.parity;
1628         icount->brk         = cnow.brk;
1629         icount->buf_overrun = cnow.buf_overrun;
1630
1631         return 0;
1632 }
1633
1634
1635 static int hso_serial_tiocmget(struct tty_struct *tty)
1636 {
1637         int retval;
1638         struct hso_serial *serial = tty->driver_data;
1639         struct hso_tiocmget  *tiocmget;
1640         u16 UART_state_bitmap;
1641
1642         /* sanity check */
1643         if (!serial) {
1644                 hso_dbg(0x1, "no tty structures\n");
1645                 return -EINVAL;
1646         }
1647         spin_lock_irq(&serial->serial_lock);
1648         retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1649             ((serial->dtr_state) ? TIOCM_DTR : 0);
1650         tiocmget = serial->tiocmget;
1651         if (tiocmget) {
1652
1653                 UART_state_bitmap = le16_to_cpu(
1654                         tiocmget->prev_UART_state_bitmap);
1655                 if (UART_state_bitmap & B_RING_SIGNAL)
1656                         retval |=  TIOCM_RNG;
1657                 if (UART_state_bitmap & B_RX_CARRIER)
1658                         retval |=  TIOCM_CD;
1659                 if (UART_state_bitmap & B_TX_CARRIER)
1660                         retval |=  TIOCM_DSR;
1661         }
1662         spin_unlock_irq(&serial->serial_lock);
1663         return retval;
1664 }
1665
1666 static int hso_serial_tiocmset(struct tty_struct *tty,
1667                                unsigned int set, unsigned int clear)
1668 {
1669         int val = 0;
1670         unsigned long flags;
1671         int if_num;
1672         struct hso_serial *serial = tty->driver_data;
1673         struct usb_interface *interface;
1674
1675         /* sanity check */
1676         if (!serial) {
1677                 hso_dbg(0x1, "no tty structures\n");
1678                 return -EINVAL;
1679         }
1680
1681         if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1682                 return -EINVAL;
1683
1684         interface = serial->parent->interface;
1685         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1686
1687         spin_lock_irqsave(&serial->serial_lock, flags);
1688         if (set & TIOCM_RTS)
1689                 serial->rts_state = 1;
1690         if (set & TIOCM_DTR)
1691                 serial->dtr_state = 1;
1692
1693         if (clear & TIOCM_RTS)
1694                 serial->rts_state = 0;
1695         if (clear & TIOCM_DTR)
1696                 serial->dtr_state = 0;
1697
1698         if (serial->dtr_state)
1699                 val |= 0x01;
1700         if (serial->rts_state)
1701                 val |= 0x02;
1702
1703         spin_unlock_irqrestore(&serial->serial_lock, flags);
1704
1705         return usb_control_msg(serial->parent->usb,
1706                                usb_rcvctrlpipe(serial->parent->usb, 0), 0x22,
1707                                0x21, val, if_num, NULL, 0,
1708                                USB_CTRL_SET_TIMEOUT);
1709 }
1710
1711 static int hso_serial_ioctl(struct tty_struct *tty,
1712                             unsigned int cmd, unsigned long arg)
1713 {
1714         struct hso_serial *serial = tty->driver_data;
1715         int ret = 0;
1716         hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1717
1718         if (!serial)
1719                 return -ENODEV;
1720         switch (cmd) {
1721         case TIOCMIWAIT:
1722                 ret = hso_wait_modem_status(serial, arg);
1723                 break;
1724         default:
1725                 ret = -ENOIOCTLCMD;
1726                 break;
1727         }
1728         return ret;
1729 }
1730
1731
1732 /* starts a transmit */
1733 static void hso_kick_transmit(struct hso_serial *serial)
1734 {
1735         unsigned long flags;
1736         int res;
1737
1738         spin_lock_irqsave(&serial->serial_lock, flags);
1739         if (!serial->tx_buffer_count)
1740                 goto out;
1741
1742         if (serial->tx_urb_used)
1743                 goto out;
1744
1745         /* Wakeup USB interface if necessary */
1746         if (hso_get_activity(serial->parent) == -EAGAIN)
1747                 goto out;
1748
1749         /* Switch pointers around to avoid memcpy */
1750         swap(serial->tx_buffer, serial->tx_data);
1751         serial->tx_data_count = serial->tx_buffer_count;
1752         serial->tx_buffer_count = 0;
1753
1754         /* If serial->tx_data is set, it means we switched buffers */
1755         if (serial->tx_data && serial->write_data) {
1756                 res = serial->write_data(serial);
1757                 if (res >= 0)
1758                         serial->tx_urb_used = 1;
1759         }
1760 out:
1761         spin_unlock_irqrestore(&serial->serial_lock, flags);
1762 }
1763
1764 /* make a request (for reading and writing data to muxed serial port) */
1765 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1766                               struct urb *ctrl_urb,
1767                               struct usb_ctrlrequest *ctrl_req,
1768                               u8 *ctrl_urb_data, u32 size)
1769 {
1770         int result;
1771         int pipe;
1772
1773         /* Sanity check */
1774         if (!serial || !ctrl_urb || !ctrl_req) {
1775                 pr_err("%s: Wrong arguments\n", __func__);
1776                 return -EINVAL;
1777         }
1778
1779         /* initialize */
1780         ctrl_req->wValue = 0;
1781         ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1782         ctrl_req->wLength = cpu_to_le16(size);
1783
1784         if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1785                 /* Reading command */
1786                 ctrl_req->bRequestType = USB_DIR_IN |
1787                                          USB_TYPE_OPTION_VENDOR |
1788                                          USB_RECIP_INTERFACE;
1789                 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1790                 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1791         } else {
1792                 /* Writing command */
1793                 ctrl_req->bRequestType = USB_DIR_OUT |
1794                                          USB_TYPE_OPTION_VENDOR |
1795                                          USB_RECIP_INTERFACE;
1796                 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1797                 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1798         }
1799         /* syslog */
1800         hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1801                 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1802                 ctrl_req->bRequestType, ctrl_req->wLength, port);
1803
1804         /* Load ctrl urb */
1805         ctrl_urb->transfer_flags = 0;
1806         usb_fill_control_urb(ctrl_urb,
1807                              serial->parent->usb,
1808                              pipe,
1809                              (u8 *) ctrl_req,
1810                              ctrl_urb_data, size, ctrl_callback, serial);
1811         /* Send it on merry way */
1812         result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1813         if (result) {
1814                 dev_err(&ctrl_urb->dev->dev,
1815                         "%s failed submit ctrl_urb %d type %d\n", __func__,
1816                         result, type);
1817                 return result;
1818         }
1819
1820         /* done */
1821         return size;
1822 }
1823
1824 /* called by intr_callback when read occurs */
1825 static int hso_mux_serial_read(struct hso_serial *serial)
1826 {
1827         if (!serial)
1828                 return -EINVAL;
1829
1830         /* clean data */
1831         memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1832         /* make the request */
1833
1834         if (serial->num_rx_urbs != 1) {
1835                 dev_err(&serial->parent->interface->dev,
1836                         "ERROR: mux'd reads with multiple buffers "
1837                         "not possible\n");
1838                 return 0;
1839         }
1840         return mux_device_request(serial,
1841                                   USB_CDC_GET_ENCAPSULATED_RESPONSE,
1842                                   serial->parent->port_spec & HSO_PORT_MASK,
1843                                   serial->rx_urb[0],
1844                                   &serial->ctrl_req_rx,
1845                                   serial->rx_data[0], serial->rx_data_length);
1846 }
1847
1848 /* used for muxed serial port callback (muxed serial read) */
1849 static void intr_callback(struct urb *urb)
1850 {
1851         struct hso_shared_int *shared_int = urb->context;
1852         struct hso_serial *serial;
1853         unsigned char *port_req;
1854         int status = urb->status;
1855         unsigned long flags;
1856         int i;
1857
1858         usb_mark_last_busy(urb->dev);
1859
1860         /* sanity check */
1861         if (!shared_int)
1862                 return;
1863
1864         /* status check */
1865         if (status) {
1866                 handle_usb_error(status, __func__, NULL);
1867                 return;
1868         }
1869         hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1870
1871         /* what request? */
1872         port_req = urb->transfer_buffer;
1873         hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1874         /* loop over all muxed ports to find the one sending this */
1875         for (i = 0; i < 8; i++) {
1876                 /* max 8 channels on MUX */
1877                 if (*port_req & (1 << i)) {
1878                         serial = get_serial_by_shared_int_and_type(shared_int,
1879                                                                    (1 << i));
1880                         if (serial != NULL) {
1881                                 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1882                                         i);
1883                                 spin_lock_irqsave(&serial->serial_lock, flags);
1884                                 if (serial->rx_state == RX_IDLE &&
1885                                         serial->port.count > 0) {
1886                                         /* Setup and send a ctrl req read on
1887                                          * port i */
1888                                         if (!serial->rx_urb_filled[0]) {
1889                                                 serial->rx_state = RX_SENT;
1890                                                 hso_mux_serial_read(serial);
1891                                         } else
1892                                                 serial->rx_state = RX_PENDING;
1893                                 } else {
1894                                         hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1895                                                 i);
1896                                 }
1897                                 spin_unlock_irqrestore(&serial->serial_lock,
1898                                                        flags);
1899                         }
1900                 }
1901         }
1902         /* Resubmit interrupt urb */
1903         hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1904 }
1905
1906 /* called for writing to muxed serial port */
1907 static int hso_mux_serial_write_data(struct hso_serial *serial)
1908 {
1909         if (NULL == serial)
1910                 return -EINVAL;
1911
1912         return mux_device_request(serial,
1913                                   USB_CDC_SEND_ENCAPSULATED_COMMAND,
1914                                   serial->parent->port_spec & HSO_PORT_MASK,
1915                                   serial->tx_urb,
1916                                   &serial->ctrl_req_tx,
1917                                   serial->tx_data, serial->tx_data_count);
1918 }
1919
1920 /* write callback for Diag and CS port */
1921 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1922 {
1923         struct hso_serial *serial = urb->context;
1924         int status = urb->status;
1925         unsigned long flags;
1926
1927         /* sanity check */
1928         if (!serial) {
1929                 hso_dbg(0x1, "serial == NULL\n");
1930                 return;
1931         }
1932
1933         spin_lock_irqsave(&serial->serial_lock, flags);
1934         serial->tx_urb_used = 0;
1935         spin_unlock_irqrestore(&serial->serial_lock, flags);
1936         if (status) {
1937                 handle_usb_error(status, __func__, serial->parent);
1938                 return;
1939         }
1940         hso_put_activity(serial->parent);
1941         tty_port_tty_wakeup(&serial->port);
1942         hso_kick_transmit(serial);
1943
1944         hso_dbg(0x1, "\n");
1945 }
1946
1947 /* called for writing diag or CS serial port */
1948 static int hso_std_serial_write_data(struct hso_serial *serial)
1949 {
1950         int count = serial->tx_data_count;
1951         int result;
1952
1953         usb_fill_bulk_urb(serial->tx_urb,
1954                           serial->parent->usb,
1955                           usb_sndbulkpipe(serial->parent->usb,
1956                                           serial->out_endp->
1957                                           bEndpointAddress & 0x7F),
1958                           serial->tx_data, serial->tx_data_count,
1959                           hso_std_serial_write_bulk_callback, serial);
1960
1961         result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1962         if (result) {
1963                 dev_warn(&serial->parent->usb->dev,
1964                          "Failed to submit urb - res %d\n", result);
1965                 return result;
1966         }
1967
1968         return count;
1969 }
1970
1971 /* callback after read or write on muxed serial port */
1972 static void ctrl_callback(struct urb *urb)
1973 {
1974         struct hso_serial *serial = urb->context;
1975         struct usb_ctrlrequest *req;
1976         int status = urb->status;
1977         unsigned long flags;
1978
1979         /* sanity check */
1980         if (!serial)
1981                 return;
1982
1983         spin_lock_irqsave(&serial->serial_lock, flags);
1984         serial->tx_urb_used = 0;
1985         spin_unlock_irqrestore(&serial->serial_lock, flags);
1986         if (status) {
1987                 handle_usb_error(status, __func__, serial->parent);
1988                 return;
1989         }
1990
1991         /* what request? */
1992         req = (struct usb_ctrlrequest *)(urb->setup_packet);
1993         hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1994         hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1995         DUMP1(urb->transfer_buffer, urb->actual_length);
1996
1997         if (req->bRequestType ==
1998             (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1999                 /* response to a read command */
2000                 serial->rx_urb_filled[0] = 1;
2001                 spin_lock_irqsave(&serial->serial_lock, flags);
2002                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
2003                 spin_unlock_irqrestore(&serial->serial_lock, flags);
2004         } else {
2005                 hso_put_activity(serial->parent);
2006                 tty_port_tty_wakeup(&serial->port);
2007                 /* response to a write command */
2008                 hso_kick_transmit(serial);
2009         }
2010 }
2011
2012 /* handle RX data for serial port */
2013 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
2014 {
2015         struct tty_struct *tty;
2016         int count;
2017
2018         /* Sanity check */
2019         if (urb == NULL || serial == NULL) {
2020                 hso_dbg(0x1, "serial = NULL\n");
2021                 return -2;
2022         }
2023
2024         tty = tty_port_tty_get(&serial->port);
2025
2026         if (tty && tty_throttled(tty)) {
2027                 tty_kref_put(tty);
2028                 return -1;
2029         }
2030
2031         /* Push data to tty */
2032         hso_dbg(0x1, "data to push to tty\n");
2033         count = tty_buffer_request_room(&serial->port, urb->actual_length);
2034         if (count >= urb->actual_length) {
2035                 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2036                                        urb->actual_length);
2037                 tty_flip_buffer_push(&serial->port);
2038         } else {
2039                 dev_warn(&serial->parent->usb->dev,
2040                          "dropping data, %d bytes lost\n", urb->actual_length);
2041         }
2042
2043         tty_kref_put(tty);
2044
2045         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2046
2047         return 0;
2048 }
2049
2050
2051 /* Base driver functions */
2052
2053 static void hso_log_port(struct hso_device *hso_dev)
2054 {
2055         char *port_type;
2056         char port_dev[20];
2057
2058         switch (hso_dev->port_spec & HSO_PORT_MASK) {
2059         case HSO_PORT_CONTROL:
2060                 port_type = "Control";
2061                 break;
2062         case HSO_PORT_APP:
2063                 port_type = "Application";
2064                 break;
2065         case HSO_PORT_GPS:
2066                 port_type = "GPS";
2067                 break;
2068         case HSO_PORT_GPS_CONTROL:
2069                 port_type = "GPS control";
2070                 break;
2071         case HSO_PORT_APP2:
2072                 port_type = "Application2";
2073                 break;
2074         case HSO_PORT_PCSC:
2075                 port_type = "PCSC";
2076                 break;
2077         case HSO_PORT_DIAG:
2078                 port_type = "Diagnostic";
2079                 break;
2080         case HSO_PORT_DIAG2:
2081                 port_type = "Diagnostic2";
2082                 break;
2083         case HSO_PORT_MODEM:
2084                 port_type = "Modem";
2085                 break;
2086         case HSO_PORT_NETWORK:
2087                 port_type = "Network";
2088                 break;
2089         default:
2090                 port_type = "Unknown";
2091                 break;
2092         }
2093         if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2094                 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2095         } else
2096                 sprintf(port_dev, "/dev/%s%d", tty_filename,
2097                         dev2ser(hso_dev)->minor);
2098
2099         dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2100                 port_type, port_dev);
2101 }
2102
2103 static int hso_start_net_device(struct hso_device *hso_dev)
2104 {
2105         int i, result = 0;
2106         struct hso_net *hso_net = dev2net(hso_dev);
2107
2108         if (!hso_net)
2109                 return -ENODEV;
2110
2111         /* send URBs for all read buffers */
2112         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2113
2114                 /* Prep a receive URB */
2115                 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2116                                   hso_dev->usb,
2117                                   usb_rcvbulkpipe(hso_dev->usb,
2118                                                   hso_net->in_endp->
2119                                                   bEndpointAddress & 0x7F),
2120                                   hso_net->mux_bulk_rx_buf_pool[i],
2121                                   MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2122                                   hso_net);
2123
2124                 /* Put it out there so the device can send us stuff */
2125                 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2126                                         GFP_NOIO);
2127                 if (result)
2128                         dev_warn(&hso_dev->usb->dev,
2129                                 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2130                                 i, result);
2131         }
2132
2133         return result;
2134 }
2135
2136 static int hso_stop_net_device(struct hso_device *hso_dev)
2137 {
2138         int i;
2139         struct hso_net *hso_net = dev2net(hso_dev);
2140
2141         if (!hso_net)
2142                 return -ENODEV;
2143
2144         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2145                 if (hso_net->mux_bulk_rx_urb_pool[i])
2146                         usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2147
2148         }
2149         if (hso_net->mux_bulk_tx_urb)
2150                 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2151
2152         return 0;
2153 }
2154
2155 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2156 {
2157         int i, result = 0;
2158         struct hso_serial *serial = dev2ser(hso_dev);
2159
2160         if (!serial)
2161                 return -ENODEV;
2162
2163         /* If it is not the MUX port fill in and submit a bulk urb (already
2164          * allocated in hso_serial_start) */
2165         if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2166                 for (i = 0; i < serial->num_rx_urbs; i++) {
2167                         usb_fill_bulk_urb(serial->rx_urb[i],
2168                                           serial->parent->usb,
2169                                           usb_rcvbulkpipe(serial->parent->usb,
2170                                                           serial->in_endp->
2171                                                           bEndpointAddress &
2172                                                           0x7F),
2173                                           serial->rx_data[i],
2174                                           serial->rx_data_length,
2175                                           hso_std_serial_read_bulk_callback,
2176                                           serial);
2177                         result = usb_submit_urb(serial->rx_urb[i], flags);
2178                         if (result) {
2179                                 dev_warn(&serial->parent->usb->dev,
2180                                          "Failed to submit urb - res %d\n",
2181                                          result);
2182                                 break;
2183                         }
2184                 }
2185         } else {
2186                 mutex_lock(&serial->shared_int->shared_int_lock);
2187                 if (!serial->shared_int->use_count) {
2188                         result =
2189                             hso_mux_submit_intr_urb(serial->shared_int,
2190                                                     hso_dev->usb, flags);
2191                 }
2192                 serial->shared_int->use_count++;
2193                 mutex_unlock(&serial->shared_int->shared_int_lock);
2194         }
2195         if (serial->tiocmget)
2196                 tiocmget_submit_urb(serial,
2197                                     serial->tiocmget,
2198                                     serial->parent->usb);
2199         return result;
2200 }
2201
2202 static int hso_stop_serial_device(struct hso_device *hso_dev)
2203 {
2204         int i;
2205         struct hso_serial *serial = dev2ser(hso_dev);
2206         struct hso_tiocmget  *tiocmget;
2207
2208         if (!serial)
2209                 return -ENODEV;
2210
2211         for (i = 0; i < serial->num_rx_urbs; i++) {
2212                 if (serial->rx_urb[i]) {
2213                         usb_kill_urb(serial->rx_urb[i]);
2214                         serial->rx_urb_filled[i] = 0;
2215                 }
2216         }
2217         serial->curr_rx_urb_idx = 0;
2218
2219         if (serial->tx_urb)
2220                 usb_kill_urb(serial->tx_urb);
2221
2222         if (serial->shared_int) {
2223                 mutex_lock(&serial->shared_int->shared_int_lock);
2224                 if (serial->shared_int->use_count &&
2225                     (--serial->shared_int->use_count == 0)) {
2226                         struct urb *urb;
2227
2228                         urb = serial->shared_int->shared_intr_urb;
2229                         if (urb)
2230                                 usb_kill_urb(urb);
2231                 }
2232                 mutex_unlock(&serial->shared_int->shared_int_lock);
2233         }
2234         tiocmget = serial->tiocmget;
2235         if (tiocmget) {
2236                 wake_up_interruptible(&tiocmget->waitq);
2237                 usb_kill_urb(tiocmget->urb);
2238         }
2239
2240         return 0;
2241 }
2242
2243 static void hso_serial_tty_unregister(struct hso_serial *serial)
2244 {
2245         tty_unregister_device(tty_drv, serial->minor);
2246 }
2247
2248 static void hso_serial_common_free(struct hso_serial *serial)
2249 {
2250         int i;
2251
2252         for (i = 0; i < serial->num_rx_urbs; i++) {
2253                 /* unlink and free RX URB */
2254                 usb_free_urb(serial->rx_urb[i]);
2255                 /* free the RX buffer */
2256                 kfree(serial->rx_data[i]);
2257         }
2258
2259         /* unlink and free TX URB */
2260         usb_free_urb(serial->tx_urb);
2261         kfree(serial->tx_buffer);
2262         kfree(serial->tx_data);
2263         tty_port_destroy(&serial->port);
2264 }
2265
2266 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2267                                     int rx_size, int tx_size)
2268 {
2269         int minor;
2270         int i;
2271
2272         tty_port_init(&serial->port);
2273
2274         minor = get_free_serial_index();
2275         if (minor < 0)
2276                 goto exit;
2277
2278         /* register our minor number */
2279         serial->parent->dev = tty_port_register_device_attr(&serial->port,
2280                         tty_drv, minor, &serial->parent->interface->dev,
2281                         serial->parent, hso_serial_dev_groups);
2282
2283         /* fill in specific data for later use */
2284         serial->minor = minor;
2285         serial->magic = HSO_SERIAL_MAGIC;
2286         spin_lock_init(&serial->serial_lock);
2287         serial->num_rx_urbs = num_urbs;
2288
2289         /* RX, allocate urb and initialize */
2290
2291         /* prepare our RX buffer */
2292         serial->rx_data_length = rx_size;
2293         for (i = 0; i < serial->num_rx_urbs; i++) {
2294                 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2295                 if (!serial->rx_urb[i])
2296                         goto exit;
2297                 serial->rx_urb[i]->transfer_buffer = NULL;
2298                 serial->rx_urb[i]->transfer_buffer_length = 0;
2299                 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2300                                              GFP_KERNEL);
2301                 if (!serial->rx_data[i])
2302                         goto exit;
2303         }
2304
2305         /* TX, allocate urb and initialize */
2306         serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2307         if (!serial->tx_urb)
2308                 goto exit;
2309         serial->tx_urb->transfer_buffer = NULL;
2310         serial->tx_urb->transfer_buffer_length = 0;
2311         /* prepare our TX buffer */
2312         serial->tx_data_count = 0;
2313         serial->tx_buffer_count = 0;
2314         serial->tx_data_length = tx_size;
2315         serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2316         if (!serial->tx_data)
2317                 goto exit;
2318
2319         serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2320         if (!serial->tx_buffer)
2321                 goto exit;
2322
2323         return 0;
2324 exit:
2325         hso_serial_tty_unregister(serial);
2326         hso_serial_common_free(serial);
2327         return -1;
2328 }
2329
2330 /* Creates a general hso device */
2331 static struct hso_device *hso_create_device(struct usb_interface *intf,
2332                                             int port_spec)
2333 {
2334         struct hso_device *hso_dev;
2335
2336         hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2337         if (!hso_dev)
2338                 return NULL;
2339
2340         hso_dev->port_spec = port_spec;
2341         hso_dev->usb = interface_to_usbdev(intf);
2342         hso_dev->interface = intf;
2343         kref_init(&hso_dev->ref);
2344         mutex_init(&hso_dev->mutex);
2345
2346         INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2347         INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2348
2349         return hso_dev;
2350 }
2351
2352 /* Removes a network device in the network device table */
2353 static int remove_net_device(struct hso_device *hso_dev)
2354 {
2355         int i;
2356
2357         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2358                 if (network_table[i] == hso_dev) {
2359                         network_table[i] = NULL;
2360                         break;
2361                 }
2362         }
2363         if (i == HSO_MAX_NET_DEVICES)
2364                 return -1;
2365         return 0;
2366 }
2367
2368 /* Frees our network device */
2369 static void hso_free_net_device(struct hso_device *hso_dev)
2370 {
2371         int i;
2372         struct hso_net *hso_net = dev2net(hso_dev);
2373
2374         if (!hso_net)
2375                 return;
2376
2377         remove_net_device(hso_net->parent);
2378
2379         if (hso_net->net)
2380                 unregister_netdev(hso_net->net);
2381
2382         /* start freeing */
2383         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2384                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2385                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2386                 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2387         }
2388         usb_free_urb(hso_net->mux_bulk_tx_urb);
2389         kfree(hso_net->mux_bulk_tx_buf);
2390         hso_net->mux_bulk_tx_buf = NULL;
2391
2392         if (hso_net->net)
2393                 free_netdev(hso_net->net);
2394
2395         kfree(hso_dev);
2396 }
2397
2398 static const struct net_device_ops hso_netdev_ops = {
2399         .ndo_open       = hso_net_open,
2400         .ndo_stop       = hso_net_close,
2401         .ndo_start_xmit = hso_net_start_xmit,
2402         .ndo_tx_timeout = hso_net_tx_timeout,
2403 };
2404
2405 /* initialize the network interface */
2406 static void hso_net_init(struct net_device *net)
2407 {
2408         struct hso_net *hso_net = netdev_priv(net);
2409
2410         hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2411
2412         /* fill in the other fields */
2413         net->netdev_ops = &hso_netdev_ops;
2414         net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2415         net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2416         net->type = ARPHRD_NONE;
2417         net->mtu = DEFAULT_MTU - 14;
2418         net->tx_queue_len = 10;
2419         net->ethtool_ops = &ops;
2420
2421         /* and initialize the semaphore */
2422         spin_lock_init(&hso_net->net_lock);
2423 }
2424
2425 /* Adds a network device in the network device table */
2426 static int add_net_device(struct hso_device *hso_dev)
2427 {
2428         int i;
2429
2430         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2431                 if (network_table[i] == NULL) {
2432                         network_table[i] = hso_dev;
2433                         break;
2434                 }
2435         }
2436         if (i == HSO_MAX_NET_DEVICES)
2437                 return -1;
2438         return 0;
2439 }
2440
2441 static int hso_rfkill_set_block(void *data, bool blocked)
2442 {
2443         struct hso_device *hso_dev = data;
2444         int enabled = !blocked;
2445         int rv;
2446
2447         mutex_lock(&hso_dev->mutex);
2448         if (hso_dev->usb_gone)
2449                 rv = 0;
2450         else
2451                 rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
2452                                        enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2453                                        USB_CTRL_SET_TIMEOUT);
2454         mutex_unlock(&hso_dev->mutex);
2455         return rv;
2456 }
2457
2458 static const struct rfkill_ops hso_rfkill_ops = {
2459         .set_block = hso_rfkill_set_block,
2460 };
2461
2462 /* Creates and sets up everything for rfkill */
2463 static void hso_create_rfkill(struct hso_device *hso_dev,
2464                              struct usb_interface *interface)
2465 {
2466         struct hso_net *hso_net = dev2net(hso_dev);
2467         struct device *dev = &hso_net->net->dev;
2468         static u32 rfkill_counter;
2469
2470         snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2471                  rfkill_counter++);
2472
2473         hso_net->rfkill = rfkill_alloc(hso_net->name,
2474                                        &interface_to_usbdev(interface)->dev,
2475                                        RFKILL_TYPE_WWAN,
2476                                        &hso_rfkill_ops, hso_dev);
2477         if (!hso_net->rfkill) {
2478                 dev_err(dev, "%s - Out of memory\n", __func__);
2479                 return;
2480         }
2481         if (rfkill_register(hso_net->rfkill) < 0) {
2482                 rfkill_destroy(hso_net->rfkill);
2483                 hso_net->rfkill = NULL;
2484                 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2485                 return;
2486         }
2487 }
2488
2489 static struct device_type hso_type = {
2490         .name   = "wwan",
2491 };
2492
2493 /* Creates our network device */
2494 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2495                                                 int port_spec)
2496 {
2497         int result, i;
2498         struct net_device *net;
2499         struct hso_net *hso_net;
2500         struct hso_device *hso_dev;
2501
2502         hso_dev = hso_create_device(interface, port_spec);
2503         if (!hso_dev)
2504                 return NULL;
2505
2506         /* allocate our network device, then we can put in our private data */
2507         /* call hso_net_init to do the basic initialization */
2508         net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2509                            hso_net_init);
2510         if (!net) {
2511                 dev_err(&interface->dev, "Unable to create ethernet device\n");
2512                 goto exit;
2513         }
2514
2515         hso_net = netdev_priv(net);
2516
2517         hso_dev->port_data.dev_net = hso_net;
2518         hso_net->net = net;
2519         hso_net->parent = hso_dev;
2520
2521         hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2522                                       USB_DIR_IN);
2523         if (!hso_net->in_endp) {
2524                 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2525                 goto exit;
2526         }
2527         hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2528                                        USB_DIR_OUT);
2529         if (!hso_net->out_endp) {
2530                 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2531                 goto exit;
2532         }
2533         SET_NETDEV_DEV(net, &interface->dev);
2534         SET_NETDEV_DEVTYPE(net, &hso_type);
2535
2536         /* start allocating */
2537         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2538                 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2539                 if (!hso_net->mux_bulk_rx_urb_pool[i])
2540                         goto exit;
2541                 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2542                                                            GFP_KERNEL);
2543                 if (!hso_net->mux_bulk_rx_buf_pool[i])
2544                         goto exit;
2545         }
2546         hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2547         if (!hso_net->mux_bulk_tx_urb)
2548                 goto exit;
2549         hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2550         if (!hso_net->mux_bulk_tx_buf)
2551                 goto exit;
2552
2553         add_net_device(hso_dev);
2554
2555         /* registering our net device */
2556         result = register_netdev(net);
2557         if (result) {
2558                 dev_err(&interface->dev, "Failed to register device\n");
2559                 goto exit;
2560         }
2561
2562         hso_log_port(hso_dev);
2563
2564         hso_create_rfkill(hso_dev, interface);
2565
2566         return hso_dev;
2567 exit:
2568         hso_free_net_device(hso_dev);
2569         return NULL;
2570 }
2571
2572 static void hso_free_tiomget(struct hso_serial *serial)
2573 {
2574         struct hso_tiocmget *tiocmget;
2575         if (!serial)
2576                 return;
2577         tiocmget = serial->tiocmget;
2578         if (tiocmget) {
2579                 usb_free_urb(tiocmget->urb);
2580                 tiocmget->urb = NULL;
2581                 serial->tiocmget = NULL;
2582                 kfree(tiocmget);
2583         }
2584 }
2585
2586 /* Frees an AT channel ( goes for both mux and non-mux ) */
2587 static void hso_free_serial_device(struct hso_device *hso_dev)
2588 {
2589         struct hso_serial *serial = dev2ser(hso_dev);
2590
2591         if (!serial)
2592                 return;
2593
2594         hso_serial_common_free(serial);
2595
2596         if (serial->shared_int) {
2597                 mutex_lock(&serial->shared_int->shared_int_lock);
2598                 if (--serial->shared_int->ref_count == 0)
2599                         hso_free_shared_int(serial->shared_int);
2600                 else
2601                         mutex_unlock(&serial->shared_int->shared_int_lock);
2602         }
2603         hso_free_tiomget(serial);
2604         kfree(serial);
2605         kfree(hso_dev);
2606 }
2607
2608 /* Creates a bulk AT channel */
2609 static struct hso_device *hso_create_bulk_serial_device(
2610                         struct usb_interface *interface, int port)
2611 {
2612         struct hso_device *hso_dev;
2613         struct hso_serial *serial;
2614         int num_urbs;
2615         struct hso_tiocmget *tiocmget;
2616
2617         hso_dev = hso_create_device(interface, port);
2618         if (!hso_dev)
2619                 return NULL;
2620
2621         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2622         if (!serial)
2623                 goto exit;
2624
2625         serial->parent = hso_dev;
2626         hso_dev->port_data.dev_serial = serial;
2627
2628         if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2629                 num_urbs = 2;
2630                 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2631                                            GFP_KERNEL);
2632                 /* it isn't going to break our heart if serial->tiocmget
2633                  *  allocation fails don't bother checking this.
2634                  */
2635                 if (serial->tiocmget) {
2636                         tiocmget = serial->tiocmget;
2637                         tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2638                         if (tiocmget->urb) {
2639                                 mutex_init(&tiocmget->mutex);
2640                                 init_waitqueue_head(&tiocmget->waitq);
2641                                 tiocmget->endp = hso_get_ep(
2642                                         interface,
2643                                         USB_ENDPOINT_XFER_INT,
2644                                         USB_DIR_IN);
2645                         } else
2646                                 hso_free_tiomget(serial);
2647                 }
2648         }
2649         else
2650                 num_urbs = 1;
2651
2652         if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2653                                      BULK_URB_TX_SIZE))
2654                 goto exit;
2655
2656         serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2657                                      USB_DIR_IN);
2658         if (!serial->in_endp) {
2659                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2660                 goto exit2;
2661         }
2662
2663         if (!
2664             (serial->out_endp =
2665              hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2666                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2667                 goto exit2;
2668         }
2669
2670         serial->write_data = hso_std_serial_write_data;
2671
2672         /* and record this serial */
2673         set_serial_by_index(serial->minor, serial);
2674
2675         /* setup the proc dirs and files if needed */
2676         hso_log_port(hso_dev);
2677
2678         /* done, return it */
2679         return hso_dev;
2680
2681 exit2:
2682         hso_serial_tty_unregister(serial);
2683         hso_serial_common_free(serial);
2684 exit:
2685         hso_free_tiomget(serial);
2686         kfree(serial);
2687         kfree(hso_dev);
2688         return NULL;
2689 }
2690
2691 /* Creates a multiplexed AT channel */
2692 static
2693 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2694                                                 int port,
2695                                                 struct hso_shared_int *mux)
2696 {
2697         struct hso_device *hso_dev;
2698         struct hso_serial *serial;
2699         int port_spec;
2700
2701         port_spec = HSO_INTF_MUX;
2702         port_spec &= ~HSO_PORT_MASK;
2703
2704         port_spec |= hso_mux_to_port(port);
2705         if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2706                 return NULL;
2707
2708         hso_dev = hso_create_device(interface, port_spec);
2709         if (!hso_dev)
2710                 return NULL;
2711
2712         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2713         if (!serial)
2714                 goto exit;
2715
2716         hso_dev->port_data.dev_serial = serial;
2717         serial->parent = hso_dev;
2718
2719         if (hso_serial_common_create
2720             (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2721                 goto exit;
2722
2723         serial->tx_data_length--;
2724         serial->write_data = hso_mux_serial_write_data;
2725
2726         serial->shared_int = mux;
2727         mutex_lock(&serial->shared_int->shared_int_lock);
2728         serial->shared_int->ref_count++;
2729         mutex_unlock(&serial->shared_int->shared_int_lock);
2730
2731         /* and record this serial */
2732         set_serial_by_index(serial->minor, serial);
2733
2734         /* setup the proc dirs and files if needed */
2735         hso_log_port(hso_dev);
2736
2737         /* done, return it */
2738         return hso_dev;
2739
2740 exit:
2741         if (serial) {
2742                 tty_unregister_device(tty_drv, serial->minor);
2743                 kfree(serial);
2744         }
2745         kfree(hso_dev);
2746         return NULL;
2747
2748 }
2749
2750 static void hso_free_shared_int(struct hso_shared_int *mux)
2751 {
2752         usb_free_urb(mux->shared_intr_urb);
2753         kfree(mux->shared_intr_buf);
2754         mutex_unlock(&mux->shared_int_lock);
2755         kfree(mux);
2756 }
2757
2758 static
2759 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2760 {
2761         struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2762
2763         if (!mux)
2764                 return NULL;
2765
2766         mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2767                                     USB_DIR_IN);
2768         if (!mux->intr_endp) {
2769                 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2770                 goto exit;
2771         }
2772
2773         mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2774         if (!mux->shared_intr_urb)
2775                 goto exit;
2776         mux->shared_intr_buf =
2777                 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2778                         GFP_KERNEL);
2779         if (!mux->shared_intr_buf)
2780                 goto exit;
2781
2782         mutex_init(&mux->shared_int_lock);
2783
2784         return mux;
2785
2786 exit:
2787         kfree(mux->shared_intr_buf);
2788         usb_free_urb(mux->shared_intr_urb);
2789         kfree(mux);
2790         return NULL;
2791 }
2792
2793 /* Gets the port spec for a certain interface */
2794 static int hso_get_config_data(struct usb_interface *interface)
2795 {
2796         struct usb_device *usbdev = interface_to_usbdev(interface);
2797         u8 *config_data = kmalloc(17, GFP_KERNEL);
2798         u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2799         s32 result;
2800
2801         if (!config_data)
2802                 return -ENOMEM;
2803         if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2804                             0x86, 0xC0, 0, 0, config_data, 17,
2805                             USB_CTRL_SET_TIMEOUT) != 0x11) {
2806                 kfree(config_data);
2807                 return -EIO;
2808         }
2809
2810         switch (config_data[if_num]) {
2811         case 0x0:
2812                 result = 0;
2813                 break;
2814         case 0x1:
2815                 result = HSO_PORT_DIAG;
2816                 break;
2817         case 0x2:
2818                 result = HSO_PORT_GPS;
2819                 break;
2820         case 0x3:
2821                 result = HSO_PORT_GPS_CONTROL;
2822                 break;
2823         case 0x4:
2824                 result = HSO_PORT_APP;
2825                 break;
2826         case 0x5:
2827                 result = HSO_PORT_APP2;
2828                 break;
2829         case 0x6:
2830                 result = HSO_PORT_CONTROL;
2831                 break;
2832         case 0x7:
2833                 result = HSO_PORT_NETWORK;
2834                 break;
2835         case 0x8:
2836                 result = HSO_PORT_MODEM;
2837                 break;
2838         case 0x9:
2839                 result = HSO_PORT_MSD;
2840                 break;
2841         case 0xa:
2842                 result = HSO_PORT_PCSC;
2843                 break;
2844         case 0xb:
2845                 result = HSO_PORT_VOICE;
2846                 break;
2847         default:
2848                 result = 0;
2849         }
2850
2851         if (result)
2852                 result |= HSO_INTF_BULK;
2853
2854         if (config_data[16] & 0x1)
2855                 result |= HSO_INFO_CRC_BUG;
2856
2857         kfree(config_data);
2858         return result;
2859 }
2860
2861 /* called once for each interface upon device insertion */
2862 static int hso_probe(struct usb_interface *interface,
2863                      const struct usb_device_id *id)
2864 {
2865         int mux, i, if_num, port_spec;
2866         unsigned char port_mask;
2867         struct hso_device *hso_dev = NULL;
2868         struct hso_shared_int *shared_int;
2869         struct hso_device *tmp_dev = NULL;
2870
2871         if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2872                 dev_err(&interface->dev, "Not our interface\n");
2873                 return -ENODEV;
2874         }
2875
2876         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2877
2878         /* Get the interface/port specification from either driver_info or from
2879          * the device itself */
2880         if (id->driver_info)
2881                 port_spec = ((u32 *)(id->driver_info))[if_num];
2882         else
2883                 port_spec = hso_get_config_data(interface);
2884
2885         /* Check if we need to switch to alt interfaces prior to port
2886          * configuration */
2887         if (interface->num_altsetting > 1)
2888                 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2889         interface->needs_remote_wakeup = 1;
2890
2891         /* Allocate new hso device(s) */
2892         switch (port_spec & HSO_INTF_MASK) {
2893         case HSO_INTF_MUX:
2894                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2895                         /* Create the network device */
2896                         if (!disable_net) {
2897                                 hso_dev = hso_create_net_device(interface,
2898                                                                 port_spec);
2899                                 if (!hso_dev)
2900                                         goto exit;
2901                                 tmp_dev = hso_dev;
2902                         }
2903                 }
2904
2905                 if (hso_get_mux_ports(interface, &port_mask))
2906                         /* TODO: de-allocate everything */
2907                         goto exit;
2908
2909                 shared_int = hso_create_shared_int(interface);
2910                 if (!shared_int)
2911                         goto exit;
2912
2913                 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2914                         if (port_mask & i) {
2915                                 hso_dev = hso_create_mux_serial_device(
2916                                                 interface, i, shared_int);
2917                                 if (!hso_dev)
2918                                         goto exit;
2919                         }
2920                 }
2921
2922                 if (tmp_dev)
2923                         hso_dev = tmp_dev;
2924                 break;
2925
2926         case HSO_INTF_BULK:
2927                 /* It's a regular bulk interface */
2928                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2929                         if (!disable_net)
2930                                 hso_dev =
2931                                     hso_create_net_device(interface, port_spec);
2932                 } else {
2933                         hso_dev =
2934                             hso_create_bulk_serial_device(interface, port_spec);
2935                 }
2936                 if (!hso_dev)
2937                         goto exit;
2938                 break;
2939         default:
2940                 goto exit;
2941         }
2942
2943         /* save our data pointer in this device */
2944         usb_set_intfdata(interface, hso_dev);
2945
2946         /* done */
2947         return 0;
2948 exit:
2949         hso_free_interface(interface);
2950         return -ENODEV;
2951 }
2952
2953 /* device removed, cleaning up */
2954 static void hso_disconnect(struct usb_interface *interface)
2955 {
2956         hso_free_interface(interface);
2957
2958         /* remove reference of our private data */
2959         usb_set_intfdata(interface, NULL);
2960 }
2961
2962 static void async_get_intf(struct work_struct *data)
2963 {
2964         struct hso_device *hso_dev =
2965             container_of(data, struct hso_device, async_get_intf);
2966         usb_autopm_get_interface(hso_dev->interface);
2967 }
2968
2969 static void async_put_intf(struct work_struct *data)
2970 {
2971         struct hso_device *hso_dev =
2972             container_of(data, struct hso_device, async_put_intf);
2973         usb_autopm_put_interface(hso_dev->interface);
2974 }
2975
2976 static int hso_get_activity(struct hso_device *hso_dev)
2977 {
2978         if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2979                 if (!hso_dev->is_active) {
2980                         hso_dev->is_active = 1;
2981                         schedule_work(&hso_dev->async_get_intf);
2982                 }
2983         }
2984
2985         if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2986                 return -EAGAIN;
2987
2988         usb_mark_last_busy(hso_dev->usb);
2989
2990         return 0;
2991 }
2992
2993 static int hso_put_activity(struct hso_device *hso_dev)
2994 {
2995         if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
2996                 if (hso_dev->is_active) {
2997                         hso_dev->is_active = 0;
2998                         schedule_work(&hso_dev->async_put_intf);
2999                         return -EAGAIN;
3000                 }
3001         }
3002         hso_dev->is_active = 0;
3003         return 0;
3004 }
3005
3006 /* called by kernel when we need to suspend device */
3007 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3008 {
3009         int i, result;
3010
3011         /* Stop all serial ports */
3012         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3013                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3014                         result = hso_stop_serial_device(serial_table[i]);
3015                         if (result)
3016                                 goto out;
3017                 }
3018         }
3019
3020         /* Stop all network ports */
3021         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3022                 if (network_table[i] &&
3023                     (network_table[i]->interface == iface)) {
3024                         result = hso_stop_net_device(network_table[i]);
3025                         if (result)
3026                                 goto out;
3027                 }
3028         }
3029
3030 out:
3031         return 0;
3032 }
3033
3034 /* called by kernel when we need to resume device */
3035 static int hso_resume(struct usb_interface *iface)
3036 {
3037         int i, result = 0;
3038         struct hso_net *hso_net;
3039
3040         /* Start all serial ports */
3041         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3042                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3043                         if (dev2ser(serial_table[i])->port.count) {
3044                                 result =
3045                                     hso_start_serial_device(serial_table[i], GFP_NOIO);
3046                                 hso_kick_transmit(dev2ser(serial_table[i]));
3047                                 if (result)
3048                                         goto out;
3049                         }
3050                 }
3051         }
3052
3053         /* Start all network ports */
3054         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3055                 if (network_table[i] &&
3056                     (network_table[i]->interface == iface)) {
3057                         hso_net = dev2net(network_table[i]);
3058                         if (hso_net->flags & IFF_UP) {
3059                                 /* First transmit any lingering data,
3060                                    then restart the device. */
3061                                 if (hso_net->skb_tx_buf) {
3062                                         dev_dbg(&iface->dev,
3063                                                 "Transmitting"
3064                                                 " lingering data\n");
3065                                         hso_net_start_xmit(hso_net->skb_tx_buf,
3066                                                            hso_net->net);
3067                                         hso_net->skb_tx_buf = NULL;
3068                                 }
3069                                 result = hso_start_net_device(network_table[i]);
3070                                 if (result)
3071                                         goto out;
3072                         }
3073                 }
3074         }
3075
3076 out:
3077         return result;
3078 }
3079
3080 static void hso_serial_ref_free(struct kref *ref)
3081 {
3082         struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3083
3084         hso_free_serial_device(hso_dev);
3085 }
3086
3087 static void hso_free_interface(struct usb_interface *interface)
3088 {
3089         struct hso_serial *serial;
3090         int i;
3091
3092         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3093                 if (serial_table[i] &&
3094                     (serial_table[i]->interface == interface)) {
3095                         serial = dev2ser(serial_table[i]);
3096                         tty_port_tty_hangup(&serial->port, false);
3097                         mutex_lock(&serial->parent->mutex);
3098                         serial->parent->usb_gone = 1;
3099                         mutex_unlock(&serial->parent->mutex);
3100                         cancel_work_sync(&serial_table[i]->async_put_intf);
3101                         cancel_work_sync(&serial_table[i]->async_get_intf);
3102                         hso_serial_tty_unregister(serial);
3103                         kref_put(&serial_table[i]->ref, hso_serial_ref_free);
3104                         set_serial_by_index(i, NULL);
3105                 }
3106         }
3107
3108         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3109                 if (network_table[i] &&
3110                     (network_table[i]->interface == interface)) {
3111                         struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3112                         /* hso_stop_net_device doesn't stop the net queue since
3113                          * traffic needs to start it again when suspended */
3114                         netif_stop_queue(dev2net(network_table[i])->net);
3115                         hso_stop_net_device(network_table[i]);
3116                         cancel_work_sync(&network_table[i]->async_put_intf);
3117                         cancel_work_sync(&network_table[i]->async_get_intf);
3118                         if (rfk) {
3119                                 rfkill_unregister(rfk);
3120                                 rfkill_destroy(rfk);
3121                         }
3122                         hso_free_net_device(network_table[i]);
3123                 }
3124         }
3125 }
3126
3127 /* Helper functions */
3128
3129 /* Get the endpoint ! */
3130 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3131                                                   int type, int dir)
3132 {
3133         int i;
3134         struct usb_host_interface *iface = intf->cur_altsetting;
3135         struct usb_endpoint_descriptor *endp;
3136
3137         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3138                 endp = &iface->endpoint[i].desc;
3139                 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3140                     (usb_endpoint_type(endp) == type))
3141                         return endp;
3142         }
3143
3144         return NULL;
3145 }
3146
3147 /* Get the byte that describes which ports are enabled */
3148 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3149 {
3150         int i;
3151         struct usb_host_interface *iface = intf->cur_altsetting;
3152
3153         if (iface->extralen == 3) {
3154                 *ports = iface->extra[2];
3155                 return 0;
3156         }
3157
3158         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3159                 if (iface->endpoint[i].extralen == 3) {
3160                         *ports = iface->endpoint[i].extra[2];
3161                         return 0;
3162                 }
3163         }
3164
3165         return -1;
3166 }
3167
3168 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3169 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3170                                    struct usb_device *usb, gfp_t gfp)
3171 {
3172         int result;
3173
3174         usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3175                          usb_rcvintpipe(usb,
3176                                 shared_int->intr_endp->bEndpointAddress & 0x7F),
3177                          shared_int->shared_intr_buf,
3178                          1,
3179                          intr_callback, shared_int,
3180                          shared_int->intr_endp->bInterval);
3181
3182         result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3183         if (result)
3184                 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3185                         result);
3186
3187         return result;
3188 }
3189
3190 /* operations setup of the serial interface */
3191 static const struct tty_operations hso_serial_ops = {
3192         .open = hso_serial_open,
3193         .close = hso_serial_close,
3194         .write = hso_serial_write,
3195         .write_room = hso_serial_write_room,
3196         .cleanup = hso_serial_cleanup,
3197         .ioctl = hso_serial_ioctl,
3198         .set_termios = hso_serial_set_termios,
3199         .chars_in_buffer = hso_serial_chars_in_buffer,
3200         .tiocmget = hso_serial_tiocmget,
3201         .tiocmset = hso_serial_tiocmset,
3202         .get_icount = hso_get_count,
3203         .unthrottle = hso_unthrottle
3204 };
3205
3206 static struct usb_driver hso_driver = {
3207         .name = driver_name,
3208         .probe = hso_probe,
3209         .disconnect = hso_disconnect,
3210         .id_table = hso_ids,
3211         .suspend = hso_suspend,
3212         .resume = hso_resume,
3213         .reset_resume = hso_resume,
3214         .supports_autosuspend = 1,
3215         .disable_hub_initiated_lpm = 1,
3216 };
3217
3218 static int __init hso_init(void)
3219 {
3220         int i;
3221         int result;
3222
3223         /* put it in the log */
3224         pr_info("%s\n", version);
3225
3226         /* Initialise the serial table semaphore and table */
3227         spin_lock_init(&serial_table_lock);
3228         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3229                 serial_table[i] = NULL;
3230
3231         /* allocate our driver using the proper amount of supported minors */
3232         tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3233         if (!tty_drv)
3234                 return -ENOMEM;
3235
3236         /* fill in all needed values */
3237         tty_drv->driver_name = driver_name;
3238         tty_drv->name = tty_filename;
3239
3240         /* if major number is provided as parameter, use that one */
3241         if (tty_major)
3242                 tty_drv->major = tty_major;
3243
3244         tty_drv->minor_start = 0;
3245         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3246         tty_drv->subtype = SERIAL_TYPE_NORMAL;
3247         tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3248         tty_drv->init_termios = tty_std_termios;
3249         hso_init_termios(&tty_drv->init_termios);
3250         tty_set_operations(tty_drv, &hso_serial_ops);
3251
3252         /* register the tty driver */
3253         result = tty_register_driver(tty_drv);
3254         if (result) {
3255                 pr_err("%s - tty_register_driver failed(%d)\n",
3256                        __func__, result);
3257                 goto err_free_tty;
3258         }
3259
3260         /* register this module as an usb driver */
3261         result = usb_register(&hso_driver);
3262         if (result) {
3263                 pr_err("Could not register hso driver - error: %d\n", result);
3264                 goto err_unreg_tty;
3265         }
3266
3267         /* done */
3268         return 0;
3269 err_unreg_tty:
3270         tty_unregister_driver(tty_drv);
3271 err_free_tty:
3272         put_tty_driver(tty_drv);
3273         return result;
3274 }
3275
3276 static void __exit hso_exit(void)
3277 {
3278         pr_info("unloaded\n");
3279
3280         tty_unregister_driver(tty_drv);
3281         /* deregister the usb driver */
3282         usb_deregister(&hso_driver);
3283         put_tty_driver(tty_drv);
3284 }
3285
3286 /* Module definitions */
3287 module_init(hso_init);
3288 module_exit(hso_exit);
3289
3290 MODULE_AUTHOR(MOD_AUTHOR);
3291 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3292 MODULE_LICENSE("GPL");
3293
3294 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3295 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3296 module_param(debug, int, 0644);
3297
3298 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3299 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3300 module_param(tty_major, int, 0644);
3301
3302 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3303 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3304 module_param(disable_net, int, 0644);