drivers/usb/serial/sierra.c

   1 /*
   2   USB Driver for Sierra Wireless
   3
   4   Copyright (C) 2006, 2007, 2008  Kevin Lloyd <klloyd@sierrawireless.com>,
   5
   6   Copyright (C) 2008, 2009  Elina Pasheva, Matthew Safar, Rory Filer
   7                         <linux@sierrawireless.com>
   8
   9   IMPORTANT DISCLAIMER: This driver is not commercially supported by
  10   Sierra Wireless. Use at your own risk.
  11
  12   This driver is free software; you can redistribute it and/or modify
  13   it under the terms of Version 2 of the GNU General Public License as
  14   published by the Free Software Foundation.
  15
  16   Portions based on the option driver by Matthias Urlichs <smurf@smurf.noris.de>
  17   Whom based his on the Keyspan driver by Hugh Blemings <hugh@blemings.org>
  18 */
  19
  20 #define DRIVER_VERSION "v.1.3.8"
  21 #define DRIVER_AUTHOR "Kevin Lloyd, Elina Pasheva, Matthew Safar, Rory Filer"
  22 #define DRIVER_DESC "USB Driver for Sierra Wireless USB modems"
  23
  24 #include <linux/kernel.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/errno.h>
  27 #include <linux/tty.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/module.h>
  30 #include <linux/usb.h>
  31 #include <linux/usb/serial.h>
  32
  33 #define SWIMS_USB_REQUEST_SetPower      0x00
  34 #define SWIMS_USB_REQUEST_SetNmea       0x07
  35
  36 #define N_IN_URB        8
  37 #define N_OUT_URB       64
  38 #define IN_BUFLEN       4096
  39
  40 #define MAX_TRANSFER            (PAGE_SIZE - 512)
  41 /* MAX_TRANSFER is chosen so that the VM is not stressed by
  42    allocations > PAGE_SIZE and the number of packets in a page
  43    is an integer 512 is the largest possible packet on EHCI */
  44
  45 static int debug;
  46 static int nmea;
  47
  48 /* Used in interface blacklisting */
  49 struct sierra_iface_info {
  50         const u32 infolen;      /* number of interface numbers on blacklist */
  51         const u8  *ifaceinfo;   /* pointer to the array holding the numbers */
  52 };
  53
  54 struct sierra_intf_private {
  55         spinlock_t susp_lock;
  56         unsigned int suspended:1;
  57         int in_flight;
  58 };
  59
  60 static int sierra_set_power_state(struct usb_device *udev, __u16 swiState)
  61 {
  62         int result;
  63         dev_dbg(&udev->dev, "%s\n", __func__);
  64         result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  65                         SWIMS_USB_REQUEST_SetPower,     /* __u8 request      */
  66                         USB_TYPE_VENDOR,                /* __u8 request type */
  67                         swiState,                       /* __u16 value       */
  68                         0,                              /* __u16 index       */
  69                         NULL,                           /* void *data        */
  70                         0,                              /* __u16 size        */
  71                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  72         return result;
  73 }
  74
  75 static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable)
  76 {
  77         int result;
  78         dev_dbg(&udev->dev, "%s\n", __func__);
  79         result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  80                         SWIMS_USB_REQUEST_SetNmea,      /* __u8 request      */
  81                         USB_TYPE_VENDOR,                /* __u8 request type */
  82                         enable,                         /* __u16 value       */
  83                         0x0000,                         /* __u16 index       */
  84                         NULL,                           /* void *data        */
  85                         0,                              /* __u16 size        */
  86                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  87         return result;
  88 }
  89
  90 static int sierra_calc_num_ports(struct usb_serial *serial)
  91 {
  92         int num_ports = 0;
  93         u8 ifnum, numendpoints;
  94
  95         dev_dbg(&serial->dev->dev, "%s\n", __func__);
  96
  97         ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
  98         numendpoints = serial->interface->cur_altsetting->desc.bNumEndpoints;
  99
 100         /* Dummy interface present on some SKUs should be ignored */
 101         if (ifnum == 0x99)
 102                 num_ports = 0;
 103         else if (numendpoints <= 3)
 104                 num_ports = 1;
 105         else
 106                 num_ports = (numendpoints-1)/2;
 107         return num_ports;
 108 }
 109
 110 static int is_blacklisted(const u8 ifnum,
 111                                 const struct sierra_iface_info *blacklist)
 112 {
 113         const u8  *info;
 114         int i;
 115
 116         if (blacklist) {
 117                 info = blacklist->ifaceinfo;
 118
 119                 for (i = 0; i < blacklist->infolen; i++) {
 120                         if (info[i] == ifnum)
 121                                 return 1;
 122                 }
 123         }
 124         return 0;
 125 }
 126
 127 static int sierra_calc_interface(struct usb_serial *serial)
 128 {
 129         int interface;
 130         struct usb_interface *p_interface;
 131         struct usb_host_interface *p_host_interface;
 132         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 133
 134         /* Get the interface structure pointer from the serial struct */
 135         p_interface = serial->interface;
 136
 137         /* Get a pointer to the host interface structure */
 138         p_host_interface = p_interface->cur_altsetting;
 139
 140         /* read the interface descriptor for this active altsetting
 141          * to find out the interface number we are on
 142         */
 143         interface = p_host_interface->desc.bInterfaceNumber;
 144
 145         return interface;
 146 }
 147
 148 static int sierra_probe(struct usb_serial *serial,
 149                         const struct usb_device_id *id)
 150 {
 151         int result = 0;
 152         struct usb_device *udev;
 153         struct sierra_intf_private *data;
 154         u8 ifnum;
 155
 156         udev = serial->dev;
 157         dev_dbg(&udev->dev, "%s\n", __func__);
 158
 159         ifnum = sierra_calc_interface(serial);
 160         /*
 161          * If this interface supports more than 1 alternate
 162          * select the 2nd one
 163          */
 164         if (serial->interface->num_altsetting == 2) {
 165                 dev_dbg(&udev->dev, "Selecting alt setting for interface %d\n",
 166                         ifnum);
 167                 /* We know the alternate setting is 1 for the MC8785 */
 168                 usb_set_interface(udev, ifnum, 1);
 169         }
 170
 171         /* ifnum could have changed - by calling usb_set_interface */
 172         ifnum = sierra_calc_interface(serial);
 173
 174         if (is_blacklisted(ifnum,
 175                                 (struct sierra_iface_info *)id->driver_info)) {
 176                 dev_dbg(&serial->dev->dev,
 177                         "Ignoring blacklisted interface #%d\n", ifnum);
 178                 return -ENODEV;
 179         }
 180
 181         data = serial->private = kzalloc(sizeof(struct sierra_intf_private), GFP_KERNEL);
 182         if (!data)
 183                 return -ENOMEM;
 184         spin_lock_init(&data->susp_lock);
 185
 186         return result;
 187 }
 188
 189 static const u8 direct_ip_non_serial_ifaces[] = { 7, 8, 9, 10, 11 };
 190 static const struct sierra_iface_info direct_ip_interface_blacklist = {
 191         .infolen = ARRAY_SIZE(direct_ip_non_serial_ifaces),
 192         .ifaceinfo = direct_ip_non_serial_ifaces,
 193 };
 194
 195 static struct usb_device_id id_table [] = {
 196         { USB_DEVICE(0x0F3D, 0x0112) }, /* Airprime/Sierra PC 5220 */
 197         { USB_DEVICE(0x03F0, 0x1B1D) }, /* HP ev2200 a.k.a MC5720 */
 198         { USB_DEVICE(0x03F0, 0x1E1D) }, /* HP hs2300 a.k.a MC8775 */
 199
 200         { USB_DEVICE(0x1199, 0x0017) }, /* Sierra Wireless EM5625 */
 201         { USB_DEVICE(0x1199, 0x0018) }, /* Sierra Wireless MC5720 */
 202         { USB_DEVICE(0x1199, 0x0218) }, /* Sierra Wireless MC5720 */
 203         { USB_DEVICE(0x1199, 0x0020) }, /* Sierra Wireless MC5725 */
 204         { USB_DEVICE(0x1199, 0x0220) }, /* Sierra Wireless MC5725 */
 205         { USB_DEVICE(0x1199, 0x0022) }, /* Sierra Wireless EM5725 */
 206         { USB_DEVICE(0x1199, 0x0024) }, /* Sierra Wireless MC5727 */
 207         { USB_DEVICE(0x1199, 0x0224) }, /* Sierra Wireless MC5727 */
 208         { USB_DEVICE(0x1199, 0x0019) }, /* Sierra Wireless AirCard 595 */
 209         { USB_DEVICE(0x1199, 0x0021) }, /* Sierra Wireless AirCard 597E */
 210         { USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless AirCard 580 */
 211         { USB_DEVICE(0x1199, 0x0120) }, /* Sierra Wireless USB Dongle 595U */
 212         /* Sierra Wireless C597 */
 213         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0023, 0xFF, 0xFF, 0xFF) },
 214         /* Sierra Wireless T598 */
 215         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0025, 0xFF, 0xFF, 0xFF) },
 216         { USB_DEVICE(0x1199, 0x0026) }, /* Sierra Wireless T11 */
 217         { USB_DEVICE(0x1199, 0x0027) }, /* Sierra Wireless AC402 */
 218         { USB_DEVICE(0x1199, 0x0028) }, /* Sierra Wireless MC5728 */
 219         { USB_DEVICE(0x1199, 0x0029) }, /* Sierra Wireless Device */
 220
 221         { USB_DEVICE(0x1199, 0x6802) }, /* Sierra Wireless MC8755 */
 222         { USB_DEVICE(0x1199, 0x6803) }, /* Sierra Wireless MC8765 */
 223         { USB_DEVICE(0x1199, 0x6804) }, /* Sierra Wireless MC8755 */
 224         { USB_DEVICE(0x1199, 0x6805) }, /* Sierra Wireless MC8765 */
 225         { USB_DEVICE(0x1199, 0x6808) }, /* Sierra Wireless MC8755 */
 226         { USB_DEVICE(0x1199, 0x6809) }, /* Sierra Wireless MC8765 */
 227         { USB_DEVICE(0x1199, 0x6812) }, /* Sierra Wireless MC8775 & AC 875U */
 228         { USB_DEVICE(0x1199, 0x6813) }, /* Sierra Wireless MC8775 */
 229         { USB_DEVICE(0x1199, 0x6815) }, /* Sierra Wireless MC8775 */
 230         { USB_DEVICE(0x1199, 0x6816) }, /* Sierra Wireless MC8775 */
 231         { USB_DEVICE(0x1199, 0x6820) }, /* Sierra Wireless AirCard 875 */
 232         { USB_DEVICE(0x1199, 0x6821) }, /* Sierra Wireless AirCard 875U */
 233         { USB_DEVICE(0x1199, 0x6822) }, /* Sierra Wireless AirCard 875E */
 234         { USB_DEVICE(0x1199, 0x6832) }, /* Sierra Wireless MC8780 */
 235         { USB_DEVICE(0x1199, 0x6833) }, /* Sierra Wireless MC8781 */
 236         { USB_DEVICE(0x1199, 0x6834) }, /* Sierra Wireless MC8780 */
 237         { USB_DEVICE(0x1199, 0x6835) }, /* Sierra Wireless MC8781 */
 238         { USB_DEVICE(0x1199, 0x6838) }, /* Sierra Wireless MC8780 */
 239         { USB_DEVICE(0x1199, 0x6839) }, /* Sierra Wireless MC8781 */
 240         { USB_DEVICE(0x1199, 0x683A) }, /* Sierra Wireless MC8785 */
 241         { USB_DEVICE(0x1199, 0x683B) }, /* Sierra Wireless MC8785 Composite */
 242         /* Sierra Wireless MC8790, MC8791, MC8792 Composite */
 243         { USB_DEVICE(0x1199, 0x683C) },
 244         { USB_DEVICE(0x1199, 0x683D) }, /* Sierra Wireless MC8791 Composite */
 245         /* Sierra Wireless MC8790, MC8791, MC8792 */
 246         { USB_DEVICE(0x1199, 0x683E) },
 247         { USB_DEVICE(0x1199, 0x6850) }, /* Sierra Wireless AirCard 880 */
 248         { USB_DEVICE(0x1199, 0x6851) }, /* Sierra Wireless AirCard 881 */
 249         { USB_DEVICE(0x1199, 0x6852) }, /* Sierra Wireless AirCard 880 E */
 250         { USB_DEVICE(0x1199, 0x6853) }, /* Sierra Wireless AirCard 881 E */
 251         { USB_DEVICE(0x1199, 0x6855) }, /* Sierra Wireless AirCard 880 U */
 252         { USB_DEVICE(0x1199, 0x6856) }, /* Sierra Wireless AirCard 881 U */
 253         { USB_DEVICE(0x1199, 0x6859) }, /* Sierra Wireless AirCard 885 E */
 254         { USB_DEVICE(0x1199, 0x685A) }, /* Sierra Wireless AirCard 885 E */
 255         /* Sierra Wireless C885 */
 256         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6880, 0xFF, 0xFF, 0xFF)},
 257         /* Sierra Wireless C888, Air Card 501, USB 303, USB 304 */
 258         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6890, 0xFF, 0xFF, 0xFF)},
 259         /* Sierra Wireless C22/C33 */
 260         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6891, 0xFF, 0xFF, 0xFF)},
 261         /* Sierra Wireless HSPA Non-Composite Device */
 262         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6892, 0xFF, 0xFF, 0xFF)},
 263         { USB_DEVICE(0x1199, 0x6893) }, /* Sierra Wireless Device */
 264         { USB_DEVICE(0x1199, 0x68A3),   /* Sierra Wireless Direct IP modems */
 265           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 266         },
 267
 268         { }
 269 };
 270 MODULE_DEVICE_TABLE(usb, id_table);
 271
 272 static struct usb_driver sierra_driver = {
 273         .name       = "sierra",
 274         .probe      = usb_serial_probe,
 275         .disconnect = usb_serial_disconnect,
 276         .suspend    = usb_serial_suspend,
 277         .resume     = usb_serial_resume,
 278         .id_table   = id_table,
 279         .no_dynamic_id =        1,
 280         .supports_autosuspend = 1,
 281 };
 282
 283 struct sierra_port_private {
 284         spinlock_t lock;        /* lock the structure */
 285         int outstanding_urbs;   /* number of out urbs in flight */
 286         struct usb_anchor active;
 287         struct usb_anchor delayed;
 288
 289         /* Input endpoints and buffers for this port */
 290         struct urb *in_urbs[N_IN_URB];
 291
 292         /* Settings for the port */
 293         int rts_state;  /* Handshaking pins (outputs) */
 294         int dtr_state;
 295         int cts_state;  /* Handshaking pins (inputs) */
 296         int dsr_state;
 297         int dcd_state;
 298         int ri_state;
 299         unsigned int opened:1;
 300 };
 301
 302 static int sierra_send_setup(struct usb_serial_port *port)
 303 {
 304         struct usb_serial *serial = port->serial;
 305         struct sierra_port_private *portdata;
 306         __u16 interface = 0;
 307         int val = 0;
 308         int do_send = 0;
 309         int retval;
 310
 311         dev_dbg(&port->dev, "%s\n", __func__);
 312
 313         portdata = usb_get_serial_port_data(port);
 314
 315         if (portdata->dtr_state)
 316                 val |= 0x01;
 317         if (portdata->rts_state)
 318                 val |= 0x02;
 319
 320         /* If composite device then properly report interface */
 321         if (serial->num_ports == 1) {
 322                 interface = sierra_calc_interface(serial);
 323                 /* Control message is sent only to interfaces with
 324                  * interrupt_in endpoints
 325                  */
 326                 if (port->interrupt_in_urb) {
 327                         /* send control message */
 328                         do_send = 1;
 329                 }
 330         }
 331
 332         /* Otherwise the need to do non-composite mapping */
 333         else {
 334                 if (port->bulk_out_endpointAddress == 2)
 335                         interface = 0;
 336                 else if (port->bulk_out_endpointAddress == 4)
 337                         interface = 1;
 338                 else if (port->bulk_out_endpointAddress == 5)
 339                         interface = 2;
 340
 341                 do_send = 1;
 342         }
 343         if (!do_send)
 344                 return 0;
 345
 346         usb_autopm_get_interface(serial->interface);
 347         retval = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 348                 0x22, 0x21, val, interface, NULL, 0, USB_CTRL_SET_TIMEOUT);
 349         usb_autopm_put_interface(serial->interface);
 350
 351         return retval;
 352 }
 353
 354 static void sierra_set_termios(struct tty_struct *tty,
 355                 struct usb_serial_port *port, struct ktermios *old_termios)
 356 {
 357         dev_dbg(&port->dev, "%s\n", __func__);
 358         tty_termios_copy_hw(tty->termios, old_termios);
 359         sierra_send_setup(port);
 360 }
 361
 362 static int sierra_tiocmget(struct tty_struct *tty, struct file *file)
 363 {
 364         struct usb_serial_port *port = tty->driver_data;
 365         unsigned int value;
 366         struct sierra_port_private *portdata;
 367
 368         dev_dbg(&port->dev, "%s\n", __func__);
 369         portdata = usb_get_serial_port_data(port);
 370
 371         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
 372                 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
 373                 ((portdata->cts_state) ? TIOCM_CTS : 0) |
 374                 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
 375                 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
 376                 ((portdata->ri_state) ? TIOCM_RNG : 0);
 377
 378         return value;
 379 }
 380
 381 static int sierra_tiocmset(struct tty_struct *tty, struct file *file,
 382                         unsigned int set, unsigned int clear)
 383 {
 384         struct usb_serial_port *port = tty->driver_data;
 385         struct sierra_port_private *portdata;
 386
 387         portdata = usb_get_serial_port_data(port);
 388
 389         if (set & TIOCM_RTS)
 390                 portdata->rts_state = 1;
 391         if (set & TIOCM_DTR)
 392                 portdata->dtr_state = 1;
 393
 394         if (clear & TIOCM_RTS)
 395                 portdata->rts_state = 0;
 396         if (clear & TIOCM_DTR)
 397                 portdata->dtr_state = 0;
 398         return sierra_send_setup(port);
 399 }
 400
 401 static void sierra_release_urb(struct urb *urb)
 402 {
 403         struct usb_serial_port *port;
 404         if (urb) {
 405                 port =  urb->context;
 406                 dev_dbg(&port->dev, "%s: %p\n", __func__, urb);
 407                 kfree(urb->transfer_buffer);
 408                 usb_free_urb(urb);
 409         }
 410 }
 411
 412 static void sierra_outdat_callback(struct urb *urb)
 413 {
 414         struct usb_serial_port *port = urb->context;
 415         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 416         struct sierra_intf_private *intfdata;
 417         int status = urb->status;
 418
 419         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
 420         intfdata = port->serial->private;
 421
 422         /* free up the transfer buffer, as usb_free_urb() does not do this */
 423         kfree(urb->transfer_buffer);
 424         usb_autopm_put_interface_async(port->serial->interface);
 425         if (status)
 426                 dev_dbg(&port->dev, "%s - nonzero write bulk status "
 427                     "received: %d\n", __func__, status);
 428
 429         spin_lock(&portdata->lock);
 430         --portdata->outstanding_urbs;
 431         spin_unlock(&portdata->lock);
 432         spin_lock(&intfdata->susp_lock);
 433         --intfdata->in_flight;
 434         spin_unlock(&intfdata->susp_lock);
 435
 436         usb_serial_port_softint(port);
 437 }
 438
 439 /* Write */
 440 static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
 441                                         const unsigned char *buf, int count)
 442 {
 443         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 444         struct sierra_intf_private *intfdata;
 445         struct usb_serial *serial = port->serial;
 446         unsigned long flags;
 447         unsigned char *buffer;
 448         struct urb *urb;
 449         size_t writesize = min((size_t)count, (size_t)MAX_TRANSFER);
 450         int retval = 0;
 451
 452         /* verify that we actually have some data to write */
 453         if (count == 0)
 454                 return 0;
 455
 456         portdata = usb_get_serial_port_data(port);
 457         intfdata = serial->private;
 458
 459         dev_dbg(&port->dev, "%s: write (%zd bytes)\n", __func__, writesize);
 460         spin_lock_irqsave(&portdata->lock, flags);
 461         dev_dbg(&port->dev, "%s - outstanding_urbs: %d\n", __func__,
 462                 portdata->outstanding_urbs);
 463         if (portdata->outstanding_urbs > N_OUT_URB) {
 464                 spin_unlock_irqrestore(&portdata->lock, flags);
 465                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
 466                 return 0;
 467         }
 468         portdata->outstanding_urbs++;
 469         dev_dbg(&port->dev, "%s - 1, outstanding_urbs: %d\n", __func__,
 470                 portdata->outstanding_urbs);
 471         spin_unlock_irqrestore(&portdata->lock, flags);
 472
 473         retval = usb_autopm_get_interface_async(serial->interface);
 474         if (retval < 0) {
 475                 spin_lock_irqsave(&portdata->lock, flags);
 476                 portdata->outstanding_urbs--;
 477                 spin_unlock_irqrestore(&portdata->lock, flags);
 478                 goto error_simple;
 479         }
 480
 481         buffer = kmalloc(writesize, GFP_ATOMIC);
 482         if (!buffer) {
 483                 dev_err(&port->dev, "out of memory\n");
 484                 retval = -ENOMEM;
 485                 goto error_no_buffer;
 486         }
 487
 488         urb = usb_alloc_urb(0, GFP_ATOMIC);
 489         if (!urb) {
 490                 dev_err(&port->dev, "no more free urbs\n");
 491                 retval = -ENOMEM;
 492                 goto error_no_urb;
 493         }
 494
 495         memcpy(buffer, buf, writesize);
 496
 497         usb_serial_debug_data(debug, &port->dev, __func__, writesize, buffer);
 498
 499         usb_fill_bulk_urb(urb, serial->dev,
 500                           usb_sndbulkpipe(serial->dev,
 501                                           port->bulk_out_endpointAddress),
 502                           buffer, writesize, sierra_outdat_callback, port);
 503
 504         /* Handle the need to send a zero length packet */
 505         urb->transfer_flags |= URB_ZERO_PACKET;
 506
 507         spin_lock_irqsave(&intfdata->susp_lock, flags);
 508
 509         if (intfdata->suspended) {
 510                 usb_anchor_urb(urb, &portdata->delayed);
 511                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 512                 goto skip_power;
 513         } else {
 514                 usb_anchor_urb(urb, &portdata->active);
 515         }
 516         /* send it down the pipe */
 517         retval = usb_submit_urb(urb, GFP_ATOMIC);
 518         if (retval) {
 519                 usb_unanchor_urb(urb);
 520                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 521                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
 522                         "with status = %d\n", __func__, retval);
 523                 goto error;
 524         } else {
 525                 intfdata->in_flight++;
 526                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 527         }
 528
 529 skip_power:
 530         /* we are done with this urb, so let the host driver
 531          * really free it when it is finished with it */
 532         usb_free_urb(urb);
 533
 534         return writesize;
 535 error:
 536         usb_free_urb(urb);
 537 error_no_urb:
 538         kfree(buffer);
 539 error_no_buffer:
 540         spin_lock_irqsave(&portdata->lock, flags);
 541         --portdata->outstanding_urbs;
 542         dev_dbg(&port->dev, "%s - 2. outstanding_urbs: %d\n", __func__,
 543                 portdata->outstanding_urbs);
 544         spin_unlock_irqrestore(&portdata->lock, flags);
 545         usb_autopm_put_interface_async(serial->interface);
 546 error_simple:
 547         return retval;
 548 }
 549
 550 static void sierra_indat_callback(struct urb *urb)
 551 {
 552         int err;
 553         int endpoint;
 554         struct usb_serial_port *port;
 555         struct tty_struct *tty;
 556         unsigned char *data = urb->transfer_buffer;
 557         int status = urb->status;
 558
 559         endpoint = usb_pipeendpoint(urb->pipe);
 560         port = urb->context;
 561
 562         dev_dbg(&port->dev, "%s: %p\n", __func__, urb);
 563
 564         if (status) {
 565                 dev_dbg(&port->dev, "%s: nonzero status: %d on"
 566                         " endpoint %02x\n", __func__, status, endpoint);
 567         } else {
 568                 if (urb->actual_length) {
 569                         tty = tty_port_tty_get(&port->port);
 570
 571                         tty_buffer_request_room(tty, urb->actual_length);
 572                         tty_insert_flip_string(tty, data, urb->actual_length);
 573                         tty_flip_buffer_push(tty);
 574
 575                         tty_kref_put(tty);
 576                         usb_serial_debug_data(debug, &port->dev, __func__,
 577                                 urb->actual_length, data);
 578                 } else {
 579                         dev_dbg(&port->dev, "%s: empty read urb"
 580                                 " received\n", __func__);
 581                 }
 582         }
 583
 584         /* Resubmit urb so we continue receiving */
 585         if (port->port.count && status != -ESHUTDOWN && status != -EPERM) {
 586                 usb_mark_last_busy(port->serial->dev);
 587                 err = usb_submit_urb(urb, GFP_ATOMIC);
 588                 if (err)
 589                         dev_err(&port->dev, "resubmit read urb failed."
 590                                 "(%d)\n", err);
 591         }
 592
 593         return;
 594 }
 595
 596 static void sierra_instat_callback(struct urb *urb)
 597 {
 598         int err;
 599         int status = urb->status;
 600         struct usb_serial_port *port =  urb->context;
 601         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 602         struct usb_serial *serial = port->serial;
 603
 604         dev_dbg(&port->dev, "%s: urb %p port %p has data %p\n", __func__,
 605                 urb, port, portdata);
 606
 607         if (status == 0) {
 608                 struct usb_ctrlrequest *req_pkt =
 609                                 (struct usb_ctrlrequest *)urb->transfer_buffer;
 610
 611                 if (!req_pkt) {
 612                         dev_dbg(&port->dev, "%s: NULL req_pkt\n",
 613                                 __func__);
 614                         return;
 615                 }
 616                 if ((req_pkt->bRequestType == 0xA1) &&
 617                                 (req_pkt->bRequest == 0x20)) {
 618                         int old_dcd_state;
 619                         unsigned char signals = *((unsigned char *)
 620                                         urb->transfer_buffer +
 621                                         sizeof(struct usb_ctrlrequest));
 622                         struct tty_struct *tty;
 623
 624                         dev_dbg(&port->dev, "%s: signal x%x\n", __func__,
 625                                 signals);
 626
 627                         old_dcd_state = portdata->dcd_state;
 628                         portdata->cts_state = 1;
 629                         portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
 630                         portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
 631                         portdata->ri_state = ((signals & 0x08) ? 1 : 0);
 632
 633                         tty = tty_port_tty_get(&port->port);
 634                         if (tty && !C_CLOCAL(tty) &&
 635                                         old_dcd_state && !portdata->dcd_state)
 636                                 tty_hangup(tty);
 637                         tty_kref_put(tty);
 638                 } else {
 639                         dev_dbg(&port->dev, "%s: type %x req %x\n",
 640                                 __func__, req_pkt->bRequestType,
 641                                 req_pkt->bRequest);
 642                 }
 643         } else
 644                 dev_dbg(&port->dev, "%s: error %d\n", __func__, status);
 645
 646         /* Resubmit urb so we continue receiving IRQ data */
 647         if (port->port.count && status != -ESHUTDOWN && status != -ENOENT) {
 648                 usb_mark_last_busy(serial->dev);
 649                 urb->dev = serial->dev;
 650                 err = usb_submit_urb(urb, GFP_ATOMIC);
 651                 if (err)
 652                         dev_err(&port->dev, "%s: resubmit intr urb "
 653                                 "failed. (%d)\n", __func__, err);
 654         }
 655 }
 656
 657 static int sierra_write_room(struct tty_struct *tty)
 658 {
 659         struct usb_serial_port *port = tty->driver_data;
 660         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 661         unsigned long flags;
 662
 663         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
 664
 665         /* try to give a good number back based on if we have any free urbs at
 666          * this point in time */
 667         spin_lock_irqsave(&portdata->lock, flags);
 668         if (portdata->outstanding_urbs > N_OUT_URB * 2 / 3) {
 669                 spin_unlock_irqrestore(&portdata->lock, flags);
 670                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
 671                 return 0;
 672         }
 673         spin_unlock_irqrestore(&portdata->lock, flags);
 674
 675         return 2048;
 676 }
 677
 678 static void sierra_stop_rx_urbs(struct usb_serial_port *port)
 679 {
 680         int i;
 681         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 682
 683         for (i = 0; i < ARRAY_SIZE(portdata->in_urbs); i++)
 684                 usb_kill_urb(portdata->in_urbs[i]);
 685
 686         usb_kill_urb(port->interrupt_in_urb);
 687 }
 688
 689 static int sierra_submit_rx_urbs(struct usb_serial_port *port, gfp_t mem_flags)
 690 {
 691         int ok_cnt;
 692         int err = -EINVAL;
 693         int i;
 694         struct urb *urb;
 695         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 696
 697         ok_cnt = 0;
 698         for (i = 0; i < ARRAY_SIZE(portdata->in_urbs); i++) {
 699                 urb = portdata->in_urbs[i];
 700                 if (!urb)
 701                         continue;
 702                 err = usb_submit_urb(urb, mem_flags);
 703                 if (err) {
 704                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
 705                                 __func__, err);
 706                 } else {
 707                         ok_cnt++;
 708                 }
 709         }
 710
 711         if (ok_cnt && port->interrupt_in_urb) {
 712                 err = usb_submit_urb(port->interrupt_in_urb, mem_flags);
 713                 if (err) {
 714                         dev_err(&port->dev, "%s: submit intr urb failed: %d\n",
 715                                 __func__, err);
 716                 }
 717         }
 718
 719         if (ok_cnt > 0) /* at least one rx urb submitted */
 720                 return 0;
 721         else
 722                 return err;
 723 }
 724
 725 static struct urb *sierra_setup_urb(struct usb_serial *serial, int endpoint,
 726                                         int dir, void *ctx, int len,
 727                                         gfp_t mem_flags,
 728                                         usb_complete_t callback)
 729 {
 730         struct urb      *urb;
 731         u8              *buf;
 732
 733         if (endpoint == -1)
 734                 return NULL;
 735
 736         urb = usb_alloc_urb(0, mem_flags);
 737         if (urb == NULL) {
 738                 dev_dbg(&serial->dev->dev, "%s: alloc for endpoint %d failed\n",
 739                         __func__, endpoint);
 740                 return NULL;
 741         }
 742
 743         buf = kmalloc(len, mem_flags);
 744         if (buf) {
 745                 /* Fill URB using supplied data */
 746                 usb_fill_bulk_urb(urb, serial->dev,
 747                         usb_sndbulkpipe(serial->dev, endpoint) | dir,
 748                         buf, len, callback, ctx);
 749
 750                 /* debug */
 751                 dev_dbg(&serial->dev->dev, "%s %c u : %p d:%p\n", __func__,
 752                                 dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
 753         } else {
 754                 dev_dbg(&serial->dev->dev, "%s %c u:%p d:%p\n", __func__,
 755                                 dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
 756
 757                 sierra_release_urb(urb);
 758                 urb = NULL;
 759         }
 760
 761         return urb;
 762 }
 763
 764 static void sierra_close(struct usb_serial_port *port)
 765 {
 766         int i;
 767         struct usb_serial *serial = port->serial;
 768         struct sierra_port_private *portdata;
 769         struct sierra_intf_private *intfdata = port->serial->private;
 770
 771
 772         dev_dbg(&port->dev, "%s\n", __func__);
 773         portdata = usb_get_serial_port_data(port);
 774
 775         portdata->rts_state = 0;
 776         portdata->dtr_state = 0;
 777
 778         if (serial->dev) {
 779                 mutex_lock(&serial->disc_mutex);
 780                 if (!serial->disconnected) {
 781                         serial->interface->needs_remote_wakeup = 0;
 782                         usb_autopm_get_interface(serial->interface);
 783                         sierra_send_setup(port);
 784                 }
 785                 mutex_unlock(&serial->disc_mutex);
 786                 spin_lock_irq(&intfdata->susp_lock);
 787                 portdata->opened = 0;
 788                 spin_unlock_irq(&intfdata->susp_lock);
 789
 790
 791                 /* Stop reading urbs */
 792                 sierra_stop_rx_urbs(port);
 793                 /* .. and release them */
 794                 for (i = 0; i < N_IN_URB; i++) {
 795                         sierra_release_urb(portdata->in_urbs[i]);
 796                         portdata->in_urbs[i] = NULL;
 797                 }
 798         }
 799 }
 800
 801 static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
 802 {
 803         struct sierra_port_private *portdata;
 804         struct usb_serial *serial = port->serial;
 805         struct sierra_intf_private *intfdata = serial->private;
 806         int i;
 807         int err;
 808         int endpoint;
 809         struct urb *urb;
 810
 811         portdata = usb_get_serial_port_data(port);
 812
 813         dev_dbg(&port->dev, "%s\n", __func__);
 814
 815         /* Set some sane defaults */
 816         portdata->rts_state = 1;
 817         portdata->dtr_state = 1;
 818
 819
 820         endpoint = port->bulk_in_endpointAddress;
 821         for (i = 0; i < ARRAY_SIZE(portdata->in_urbs); i++) {
 822                 urb = sierra_setup_urb(serial, endpoint, USB_DIR_IN, port,
 823                                         IN_BUFLEN, GFP_KERNEL,
 824                                         sierra_indat_callback);
 825                 portdata->in_urbs[i] = urb;
 826         }
 827         /* clear halt condition */
 828         usb_clear_halt(serial->dev,
 829                         usb_sndbulkpipe(serial->dev, endpoint) | USB_DIR_IN);
 830
 831         err = sierra_submit_rx_urbs(port, GFP_KERNEL);
 832         if (err) {
 833                 /* get rid of everything as in close */
 834                 sierra_close(port);
 835                 /* restore balance for autopm */
 836                 usb_autopm_put_interface(serial->interface);
 837                 return err;
 838         }
 839         sierra_send_setup(port);
 840
 841         serial->interface->needs_remote_wakeup = 1;
 842         spin_lock_irq(&intfdata->susp_lock);
 843         portdata->opened = 1;
 844         spin_unlock_irq(&intfdata->susp_lock);
 845         usb_autopm_put_interface(serial->interface);
 846
 847         return 0;
 848 }
 849
 850
 851 static void sierra_dtr_rts(struct usb_serial_port *port, int on)
 852 {
 853         struct usb_serial *serial = port->serial;
 854         struct sierra_port_private *portdata;
 855
 856         portdata = usb_get_serial_port_data(port);
 857         portdata->rts_state = on;
 858         portdata->dtr_state = on;
 859
 860         if (serial->dev) {
 861                 mutex_lock(&serial->disc_mutex);
 862                 if (!serial->disconnected)
 863                         sierra_send_setup(port);
 864                 mutex_unlock(&serial->disc_mutex);
 865         }
 866 }
 867
 868 static int sierra_startup(struct usb_serial *serial)
 869 {
 870         struct usb_serial_port *port;
 871         struct sierra_port_private *portdata;
 872         int i;
 873
 874         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 875
 876         /* Set Device mode to D0 */
 877         sierra_set_power_state(serial->dev, 0x0000);
 878
 879         /* Check NMEA and set */
 880         if (nmea)
 881                 sierra_vsc_set_nmea(serial->dev, 1);
 882
 883         /* Now setup per port private data */
 884         for (i = 0; i < serial->num_ports; i++) {
 885                 port = serial->port[i];
 886                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 887                 if (!portdata) {
 888                         dev_dbg(&port->dev, "%s: kmalloc for "
 889                                 "sierra_port_private (%d) failed!.\n",
 890                                 __func__, i);
 891                         return -ENOMEM;
 892                 }
 893                 spin_lock_init(&portdata->lock);
 894                 init_usb_anchor(&portdata->active);
 895                 init_usb_anchor(&portdata->delayed);
 896                 /* Set the port private data pointer */
 897                 usb_set_serial_port_data(port, portdata);
 898         }
 899
 900         return 0;
 901 }
 902
 903 static void sierra_release(struct usb_serial *serial)
 904 {
 905         int i;
 906         struct usb_serial_port *port;
 907         struct sierra_port_private *portdata;
 908
 909         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 910
 911         for (i = 0; i < serial->num_ports; ++i) {
 912                 port = serial->port[i];
 913                 if (!port)
 914                         continue;
 915                 portdata = usb_get_serial_port_data(port);
 916                 if (!portdata)
 917                         continue;
 918                 kfree(portdata);
 919         }
 920 }
 921
 922 #ifdef CONFIG_PM
 923 static void stop_read_write_urbs(struct usb_serial *serial)
 924 {
 925         int i;
 926         struct usb_serial_port *port;
 927         struct sierra_port_private *portdata;
 928
 929         /* Stop reading/writing urbs */
 930         for (i = 0; i < serial->num_ports; ++i) {
 931                 port = serial->port[i];
 932                 portdata = usb_get_serial_port_data(port);
 933                 sierra_stop_rx_urbs(port);
 934                 usb_kill_anchored_urbs(&portdata->active);
 935         }
 936 }
 937
 938 static int sierra_suspend(struct usb_serial *serial, pm_message_t message)
 939 {
 940         struct sierra_intf_private *intfdata;
 941         int b;
 942
 943         if (serial->dev->auto_pm) {
 944                 intfdata = serial->private;
 945                 spin_lock_irq(&intfdata->susp_lock);
 946                 b = intfdata->in_flight;
 947
 948                 if (b) {
 949                         spin_unlock_irq(&intfdata->susp_lock);
 950                         return -EBUSY;
 951                 } else {
 952                         intfdata->suspended = 1;
 953                         spin_unlock_irq(&intfdata->susp_lock);
 954                 }
 955         }
 956         stop_read_write_urbs(serial);
 957
 958         return 0;
 959 }
 960
 961 static int sierra_resume(struct usb_serial *serial)
 962 {
 963         struct usb_serial_port *port;
 964         struct sierra_intf_private *intfdata = serial->private;
 965         struct sierra_port_private *portdata;
 966         struct urb *urb;
 967         int ec = 0;
 968         int i, err;
 969
 970         spin_lock_irq(&intfdata->susp_lock);
 971         for (i = 0; i < serial->num_ports; i++) {
 972                 port = serial->port[i];
 973                 portdata = usb_get_serial_port_data(port);
 974
 975                 while ((urb = usb_get_from_anchor(&portdata->delayed))) {
 976                         usb_anchor_urb(urb, &portdata->active);
 977                         intfdata->in_flight++;
 978                         err = usb_submit_urb(urb, GFP_ATOMIC);
 979                         if (err < 0) {
 980                                 intfdata->in_flight--;
 981                                 usb_unanchor_urb(urb);
 982                                 usb_scuttle_anchored_urbs(&portdata->delayed);
 983                                 break;
 984                         }
 985                 }
 986
 987                 if (portdata->opened) {
 988                         err = sierra_submit_rx_urbs(port, GFP_ATOMIC);
 989                         if (err)
 990                                 ec++;
 991                 }
 992         }
 993         intfdata->suspended = 0;
 994         spin_unlock_irq(&intfdata->susp_lock);
 995
 996         return ec ? -EIO : 0;
 997 }
 998 #else
 999 #define sierra_suspend NULL
1000 #define sierra_resume NULL
1001 #endif
1002
1003 static struct usb_serial_driver sierra_device = {
1004         .driver = {
1005                 .owner =        THIS_MODULE,
1006                 .name =         "sierra",
1007         },
1008         .description       = "Sierra USB modem",
1009         .id_table          = id_table,
1010         .usb_driver        = &sierra_driver,
1011         .calc_num_ports    = sierra_calc_num_ports,
1012         .probe             = sierra_probe,
1013         .open              = sierra_open,
1014         .close             = sierra_close,
1015         .dtr_rts           = sierra_dtr_rts,
1016         .write             = sierra_write,
1017         .write_room        = sierra_write_room,
1018         .set_termios       = sierra_set_termios,
1019         .tiocmget          = sierra_tiocmget,
1020         .tiocmset          = sierra_tiocmset,
1021         .attach            = sierra_startup,
1022         .release           = sierra_release,
1023         .suspend           = sierra_suspend,
1024         .resume            = sierra_resume,
1025         .read_int_callback = sierra_instat_callback,
1026 };
1027
1028 /* Functions used by new usb-serial code. */
1029 static int __init sierra_init(void)
1030 {
1031         int retval;
1032         retval = usb_serial_register(&sierra_device);
1033         if (retval)
1034                 goto failed_device_register;
1035
1036
1037         retval = usb_register(&sierra_driver);
1038         if (retval)
1039                 goto failed_driver_register;
1040
1041         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1042                DRIVER_DESC "\n");
1043
1044         return 0;
1045
1046 failed_driver_register:
1047         usb_serial_deregister(&sierra_device);
1048 failed_device_register:
1049         return retval;
1050 }
1051
1052 static void __exit sierra_exit(void)
1053 {
1054         usb_deregister(&sierra_driver);
1055         usb_serial_deregister(&sierra_device);
1056 }
1057
1058 module_init(sierra_init);
1059 module_exit(sierra_exit);
1060
1061 MODULE_AUTHOR(DRIVER_AUTHOR);
1062 MODULE_DESCRIPTION(DRIVER_DESC);
1063 MODULE_VERSION(DRIVER_VERSION);
1064 MODULE_LICENSE("GPL");
1065
1066 module_param(nmea, bool, S_IRUGO | S_IWUSR);
1067 MODULE_PARM_DESC(nmea, "NMEA streaming");
1068
1069 module_param(debug, bool, S_IRUGO | S_IWUSR);
1070 MODULE_PARM_DESC(debug, "Debug messages");