kernel/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 /* Uncomment to log function calls */
  20 /* #define DEBUG */
  21
  22 #define DRIVER_AUTHOR "Kevin Lloyd, Elina Pasheva, Matthew Safar, Rory Filer"
  23 #define DRIVER_DESC "USB Driver for Sierra Wireless USB modems"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/jiffies.h>
  27 #include <linux/errno.h>
  28 #include <linux/tty.h>
  29 #include <linux/slab.h>
  30 #include <linux/tty_flip.h>
  31 #include <linux/module.h>
  32 #include <linux/usb.h>
  33 #include <linux/usb/serial.h>
  34
  35 #define SWIMS_USB_REQUEST_SetPower      0x00
  36 #define SWIMS_USB_REQUEST_SetNmea       0x07
  37
  38 #define N_IN_URB_HM     8
  39 #define N_OUT_URB_HM    64
  40 #define N_IN_URB        4
  41 #define N_OUT_URB       4
  42 #define IN_BUFLEN       4096
  43
  44 #define MAX_TRANSFER            (PAGE_SIZE - 512)
  45 /* MAX_TRANSFER is chosen so that the VM is not stressed by
  46    allocations > PAGE_SIZE and the number of packets in a page
  47    is an integer 512 is the largest possible packet on EHCI */
  48
  49 static bool nmea;
  50
  51 /* Used in interface blacklisting */
  52 struct sierra_iface_info {
  53         const u32 infolen;      /* number of interface numbers on blacklist */
  54         const u8  *ifaceinfo;   /* pointer to the array holding the numbers */
  55 };
  56
  57 struct sierra_intf_private {
  58         spinlock_t susp_lock;
  59         unsigned int suspended:1;
  60         int in_flight;
  61         unsigned int open_ports;
  62 };
  63
  64 static int sierra_set_power_state(struct usb_device *udev, __u16 swiState)
  65 {
  66         return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  67                         SWIMS_USB_REQUEST_SetPower,     /* __u8 request      */
  68                         USB_TYPE_VENDOR,                /* __u8 request type */
  69                         swiState,                       /* __u16 value       */
  70                         0,                              /* __u16 index       */
  71                         NULL,                           /* void *data        */
  72                         0,                              /* __u16 size        */
  73                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  74 }
  75
  76 static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable)
  77 {
  78         return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  79                         SWIMS_USB_REQUEST_SetNmea,      /* __u8 request      */
  80                         USB_TYPE_VENDOR,                /* __u8 request type */
  81                         enable,                         /* __u16 value       */
  82                         0x0000,                         /* __u16 index       */
  83                         NULL,                           /* void *data        */
  84                         0,                              /* __u16 size        */
  85                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  86 }
  87
  88 static int sierra_calc_num_ports(struct usb_serial *serial)
  89 {
  90         int num_ports = 0;
  91         u8 ifnum, numendpoints;
  92
  93         ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
  94         numendpoints = serial->interface->cur_altsetting->desc.bNumEndpoints;
  95
  96         /* Dummy interface present on some SKUs should be ignored */
  97         if (ifnum == 0x99)
  98                 num_ports = 0;
  99         else if (numendpoints <= 3)
 100                 num_ports = 1;
 101         else
 102                 num_ports = (numendpoints-1)/2;
 103         return num_ports;
 104 }
 105
 106 static int is_blacklisted(const u8 ifnum,
 107                                 const struct sierra_iface_info *blacklist)
 108 {
 109         const u8  *info;
 110         int i;
 111
 112         if (blacklist) {
 113                 info = blacklist->ifaceinfo;
 114
 115                 for (i = 0; i < blacklist->infolen; i++) {
 116                         if (info[i] == ifnum)
 117                                 return 1;
 118                 }
 119         }
 120         return 0;
 121 }
 122
 123 static int is_himemory(const u8 ifnum,
 124                                 const struct sierra_iface_info *himemorylist)
 125 {
 126         const u8  *info;
 127         int i;
 128
 129         if (himemorylist) {
 130                 info = himemorylist->ifaceinfo;
 131
 132                 for (i=0; i < himemorylist->infolen; i++) {
 133                         if (info[i] == ifnum)
 134                                 return 1;
 135                 }
 136         }
 137         return 0;
 138 }
 139
 140 static int sierra_calc_interface(struct usb_serial *serial)
 141 {
 142         int interface;
 143         struct usb_interface *p_interface;
 144         struct usb_host_interface *p_host_interface;
 145
 146         /* Get the interface structure pointer from the serial struct */
 147         p_interface = serial->interface;
 148
 149         /* Get a pointer to the host interface structure */
 150         p_host_interface = p_interface->cur_altsetting;
 151
 152         /* read the interface descriptor for this active altsetting
 153          * to find out the interface number we are on
 154         */
 155         interface = p_host_interface->desc.bInterfaceNumber;
 156
 157         return interface;
 158 }
 159
 160 static int sierra_probe(struct usb_serial *serial,
 161                         const struct usb_device_id *id)
 162 {
 163         int result = 0;
 164         struct usb_device *udev;
 165         u8 ifnum;
 166
 167         udev = serial->dev;
 168         ifnum = sierra_calc_interface(serial);
 169
 170         /*
 171          * If this interface supports more than 1 alternate
 172          * select the 2nd one
 173          */
 174         if (serial->interface->num_altsetting == 2) {
 175                 dev_dbg(&udev->dev, "Selecting alt setting for interface %d\n",
 176                         ifnum);
 177                 /* We know the alternate setting is 1 for the MC8785 */
 178                 usb_set_interface(udev, ifnum, 1);
 179         }
 180
 181         /* ifnum could have changed - by calling usb_set_interface */
 182         ifnum = sierra_calc_interface(serial);
 183
 184         if (is_blacklisted(ifnum,
 185                                 (struct sierra_iface_info *)id->driver_info)) {
 186                 dev_dbg(&serial->dev->dev,
 187                         "Ignoring blacklisted interface #%d\n", ifnum);
 188                 return -ENODEV;
 189         }
 190
 191         return result;
 192 }
 193
 194 /* interfaces with higher memory requirements */
 195 static const u8 hi_memory_typeA_ifaces[] = { 0, 2 };
 196 static const struct sierra_iface_info typeA_interface_list = {
 197         .infolen = ARRAY_SIZE(hi_memory_typeA_ifaces),
 198         .ifaceinfo = hi_memory_typeA_ifaces,
 199 };
 200
 201 static const u8 hi_memory_typeB_ifaces[] = { 3, 4, 5, 6 };
 202 static const struct sierra_iface_info typeB_interface_list = {
 203         .infolen = ARRAY_SIZE(hi_memory_typeB_ifaces),
 204         .ifaceinfo = hi_memory_typeB_ifaces,
 205 };
 206
 207 /* 'blacklist' of interfaces not served by this driver */
 208 static const u8 direct_ip_non_serial_ifaces[] = { 7, 8, 9, 10, 11, 19, 20 };
 209 static const struct sierra_iface_info direct_ip_interface_blacklist = {
 210         .infolen = ARRAY_SIZE(direct_ip_non_serial_ifaces),
 211         .ifaceinfo = direct_ip_non_serial_ifaces,
 212 };
 213
 214 static const struct usb_device_id id_table[] = {
 215         { USB_DEVICE(0x0F3D, 0x0112) }, /* Airprime/Sierra PC 5220 */
 216         { USB_DEVICE(0x03F0, 0x1B1D) }, /* HP ev2200 a.k.a MC5720 */
 217         { USB_DEVICE(0x03F0, 0x211D) }, /* HP ev2210 a.k.a MC5725 */
 218         { USB_DEVICE(0x03F0, 0x1E1D) }, /* HP hs2300 a.k.a MC8775 */
 219
 220         { USB_DEVICE(0x1199, 0x0017) }, /* Sierra Wireless EM5625 */
 221         { USB_DEVICE(0x1199, 0x0018) }, /* Sierra Wireless MC5720 */
 222         { USB_DEVICE(0x1199, 0x0218) }, /* Sierra Wireless MC5720 */
 223         { USB_DEVICE(0x1199, 0x0020) }, /* Sierra Wireless MC5725 */
 224         { USB_DEVICE(0x1199, 0x0220) }, /* Sierra Wireless MC5725 */
 225         { USB_DEVICE(0x1199, 0x0022) }, /* Sierra Wireless EM5725 */
 226         { USB_DEVICE(0x1199, 0x0024) }, /* Sierra Wireless MC5727 */
 227         { USB_DEVICE(0x1199, 0x0224) }, /* Sierra Wireless MC5727 */
 228         { USB_DEVICE(0x1199, 0x0019) }, /* Sierra Wireless AirCard 595 */
 229         { USB_DEVICE(0x1199, 0x0021) }, /* Sierra Wireless AirCard 597E */
 230         { USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless AirCard 580 */
 231         { USB_DEVICE(0x1199, 0x0120) }, /* Sierra Wireless USB Dongle 595U */
 232         { USB_DEVICE(0x1199, 0x0301) }, /* Sierra Wireless USB Dongle 250U */
 233         /* Sierra Wireless C597 */
 234         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0023, 0xFF, 0xFF, 0xFF) },
 235         /* Sierra Wireless T598 */
 236         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0025, 0xFF, 0xFF, 0xFF) },
 237         { USB_DEVICE(0x1199, 0x0026) }, /* Sierra Wireless T11 */
 238         { USB_DEVICE(0x1199, 0x0027) }, /* Sierra Wireless AC402 */
 239         { USB_DEVICE(0x1199, 0x0028) }, /* Sierra Wireless MC5728 */
 240         { USB_DEVICE(0x1199, 0x0029) }, /* Sierra Wireless Device */
 241
 242         { USB_DEVICE(0x1199, 0x6802) }, /* Sierra Wireless MC8755 */
 243         { USB_DEVICE(0x1199, 0x6803) }, /* Sierra Wireless MC8765 */
 244         { USB_DEVICE(0x1199, 0x6804) }, /* Sierra Wireless MC8755 */
 245         { USB_DEVICE(0x1199, 0x6805) }, /* Sierra Wireless MC8765 */
 246         { USB_DEVICE(0x1199, 0x6808) }, /* Sierra Wireless MC8755 */
 247         { USB_DEVICE(0x1199, 0x6809) }, /* Sierra Wireless MC8765 */
 248         { USB_DEVICE(0x1199, 0x6812) }, /* Sierra Wireless MC8775 & AC 875U */
 249         { USB_DEVICE(0x1199, 0x6813) }, /* Sierra Wireless MC8775 */
 250         { USB_DEVICE(0x1199, 0x6815) }, /* Sierra Wireless MC8775 */
 251         { USB_DEVICE(0x1199, 0x6816) }, /* Sierra Wireless MC8775 */
 252         { USB_DEVICE(0x1199, 0x6820) }, /* Sierra Wireless AirCard 875 */
 253         { USB_DEVICE(0x1199, 0x6821) }, /* Sierra Wireless AirCard 875U */
 254         { USB_DEVICE(0x1199, 0x6822) }, /* Sierra Wireless AirCard 875E */
 255         { USB_DEVICE(0x1199, 0x6832) }, /* Sierra Wireless MC8780 */
 256         { USB_DEVICE(0x1199, 0x6833) }, /* Sierra Wireless MC8781 */
 257         { USB_DEVICE(0x1199, 0x6834) }, /* Sierra Wireless MC8780 */
 258         { USB_DEVICE(0x1199, 0x6835) }, /* Sierra Wireless MC8781 */
 259         { USB_DEVICE(0x1199, 0x6838) }, /* Sierra Wireless MC8780 */
 260         { USB_DEVICE(0x1199, 0x6839) }, /* Sierra Wireless MC8781 */
 261         { USB_DEVICE(0x1199, 0x683A) }, /* Sierra Wireless MC8785 */
 262         { USB_DEVICE(0x1199, 0x683B) }, /* Sierra Wireless MC8785 Composite */
 263         /* Sierra Wireless MC8790, MC8791, MC8792 Composite */
 264         { USB_DEVICE(0x1199, 0x683C) },
 265         { USB_DEVICE(0x1199, 0x683D) }, /* Sierra Wireless MC8791 Composite */
 266         /* Sierra Wireless MC8790, MC8791, MC8792 */
 267         { USB_DEVICE(0x1199, 0x683E) },
 268         { USB_DEVICE(0x1199, 0x6850) }, /* Sierra Wireless AirCard 880 */
 269         { USB_DEVICE(0x1199, 0x6851) }, /* Sierra Wireless AirCard 881 */
 270         { USB_DEVICE(0x1199, 0x6852) }, /* Sierra Wireless AirCard 880 E */
 271         { USB_DEVICE(0x1199, 0x6853) }, /* Sierra Wireless AirCard 881 E */
 272         { USB_DEVICE(0x1199, 0x6855) }, /* Sierra Wireless AirCard 880 U */
 273         { USB_DEVICE(0x1199, 0x6856) }, /* Sierra Wireless AirCard 881 U */
 274         { USB_DEVICE(0x1199, 0x6859) }, /* Sierra Wireless AirCard 885 E */
 275         { USB_DEVICE(0x1199, 0x685A) }, /* Sierra Wireless AirCard 885 E */
 276         /* Sierra Wireless C885 */
 277         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6880, 0xFF, 0xFF, 0xFF)},
 278         /* Sierra Wireless C888, Air Card 501, USB 303, USB 304 */
 279         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6890, 0xFF, 0xFF, 0xFF)},
 280         /* Sierra Wireless C22/C33 */
 281         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6891, 0xFF, 0xFF, 0xFF)},
 282         /* Sierra Wireless HSPA Non-Composite Device */
 283         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6892, 0xFF, 0xFF, 0xFF)},
 284         { USB_DEVICE(0x1199, 0x6893) }, /* Sierra Wireless Device */
 285         /* Sierra Wireless Direct IP modems */
 286         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x68A3, 0xFF, 0xFF, 0xFF),
 287           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 288         },
 289         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x68AA, 0xFF, 0xFF, 0xFF),
 290           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 291         },
 292         /* AT&T Direct IP LTE modems */
 293         { USB_DEVICE_AND_INTERFACE_INFO(0x0F3D, 0x68AA, 0xFF, 0xFF, 0xFF),
 294           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 295         },
 296         /* Airprime/Sierra Wireless Direct IP modems */
 297         { USB_DEVICE_AND_INTERFACE_INFO(0x0F3D, 0x68A3, 0xFF, 0xFF, 0xFF),
 298           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 299         },
 300
 301         { }
 302 };
 303 MODULE_DEVICE_TABLE(usb, id_table);
 304
 305
 306 struct sierra_port_private {
 307         spinlock_t lock;        /* lock the structure */
 308         int outstanding_urbs;   /* number of out urbs in flight */
 309         struct usb_anchor active;
 310         struct usb_anchor delayed;
 311
 312         int num_out_urbs;
 313         int num_in_urbs;
 314         /* Input endpoints and buffers for this port */
 315         struct urb *in_urbs[N_IN_URB_HM];
 316
 317         /* Settings for the port */
 318         int rts_state;  /* Handshaking pins (outputs) */
 319         int dtr_state;
 320         int cts_state;  /* Handshaking pins (inputs) */
 321         int dsr_state;
 322         int dcd_state;
 323         int ri_state;
 324 };
 325
 326 static int sierra_send_setup(struct usb_serial_port *port)
 327 {
 328         struct usb_serial *serial = port->serial;
 329         struct sierra_port_private *portdata;
 330         __u16 interface = 0;
 331         int val = 0;
 332         int do_send = 0;
 333         int retval;
 334
 335         portdata = usb_get_serial_port_data(port);
 336
 337         if (portdata->dtr_state)
 338                 val |= 0x01;
 339         if (portdata->rts_state)
 340                 val |= 0x02;
 341
 342         /* If composite device then properly report interface */
 343         if (serial->num_ports == 1) {
 344                 interface = sierra_calc_interface(serial);
 345                 /* Control message is sent only to interfaces with
 346                  * interrupt_in endpoints
 347                  */
 348                 if (port->interrupt_in_urb) {
 349                         /* send control message */
 350                         do_send = 1;
 351                 }
 352         }
 353
 354         /* Otherwise the need to do non-composite mapping */
 355         else {
 356                 if (port->bulk_out_endpointAddress == 2)
 357                         interface = 0;
 358                 else if (port->bulk_out_endpointAddress == 4)
 359                         interface = 1;
 360                 else if (port->bulk_out_endpointAddress == 5)
 361                         interface = 2;
 362
 363                 do_send = 1;
 364         }
 365         if (!do_send)
 366                 return 0;
 367
 368         retval = usb_autopm_get_interface(serial->interface);
 369         if (retval < 0)
 370                 return retval;
 371
 372         retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 373                 0x22, 0x21, val, interface, NULL, 0, USB_CTRL_SET_TIMEOUT);
 374         usb_autopm_put_interface(serial->interface);
 375
 376         return retval;
 377 }
 378
 379 static int sierra_tiocmget(struct tty_struct *tty)
 380 {
 381         struct usb_serial_port *port = tty->driver_data;
 382         unsigned int value;
 383         struct sierra_port_private *portdata;
 384
 385         portdata = usb_get_serial_port_data(port);
 386
 387         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
 388                 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
 389                 ((portdata->cts_state) ? TIOCM_CTS : 0) |
 390                 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
 391                 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
 392                 ((portdata->ri_state) ? TIOCM_RNG : 0);
 393
 394         return value;
 395 }
 396
 397 static int sierra_tiocmset(struct tty_struct *tty,
 398                         unsigned int set, unsigned int clear)
 399 {
 400         struct usb_serial_port *port = tty->driver_data;
 401         struct sierra_port_private *portdata;
 402
 403         portdata = usb_get_serial_port_data(port);
 404
 405         if (set & TIOCM_RTS)
 406                 portdata->rts_state = 1;
 407         if (set & TIOCM_DTR)
 408                 portdata->dtr_state = 1;
 409
 410         if (clear & TIOCM_RTS)
 411                 portdata->rts_state = 0;
 412         if (clear & TIOCM_DTR)
 413                 portdata->dtr_state = 0;
 414         return sierra_send_setup(port);
 415 }
 416
 417 static void sierra_release_urb(struct urb *urb)
 418 {
 419         if (urb) {
 420                 kfree(urb->transfer_buffer);
 421                 usb_free_urb(urb);
 422         }
 423 }
 424
 425 static void sierra_outdat_callback(struct urb *urb)
 426 {
 427         struct usb_serial_port *port = urb->context;
 428         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 429         struct sierra_intf_private *intfdata;
 430         int status = urb->status;
 431
 432         intfdata = usb_get_serial_data(port->serial);
 433
 434         /* free up the transfer buffer, as usb_free_urb() does not do this */
 435         kfree(urb->transfer_buffer);
 436         usb_autopm_put_interface_async(port->serial->interface);
 437         if (status)
 438                 dev_dbg(&port->dev, "%s - nonzero write bulk status "
 439                     "received: %d\n", __func__, status);
 440
 441         spin_lock(&portdata->lock);
 442         --portdata->outstanding_urbs;
 443         spin_unlock(&portdata->lock);
 444         spin_lock(&intfdata->susp_lock);
 445         --intfdata->in_flight;
 446         spin_unlock(&intfdata->susp_lock);
 447
 448         usb_serial_port_softint(port);
 449 }
 450
 451 /* Write */
 452 static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
 453                                         const unsigned char *buf, int count)
 454 {
 455         struct sierra_port_private *portdata;
 456         struct sierra_intf_private *intfdata;
 457         struct usb_serial *serial = port->serial;
 458         unsigned long flags;
 459         unsigned char *buffer;
 460         struct urb *urb;
 461         size_t writesize = min((size_t)count, (size_t)MAX_TRANSFER);
 462         int retval = 0;
 463
 464         /* verify that we actually have some data to write */
 465         if (count == 0)
 466                 return 0;
 467
 468         portdata = usb_get_serial_port_data(port);
 469         intfdata = usb_get_serial_data(serial);
 470
 471         dev_dbg(&port->dev, "%s: write (%zd bytes)\n", __func__, writesize);
 472         spin_lock_irqsave(&portdata->lock, flags);
 473         dev_dbg(&port->dev, "%s - outstanding_urbs: %d\n", __func__,
 474                 portdata->outstanding_urbs);
 475         if (portdata->outstanding_urbs > portdata->num_out_urbs) {
 476                 spin_unlock_irqrestore(&portdata->lock, flags);
 477                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
 478                 return 0;
 479         }
 480         portdata->outstanding_urbs++;
 481         dev_dbg(&port->dev, "%s - 1, outstanding_urbs: %d\n", __func__,
 482                 portdata->outstanding_urbs);
 483         spin_unlock_irqrestore(&portdata->lock, flags);
 484
 485         retval = usb_autopm_get_interface_async(serial->interface);
 486         if (retval < 0) {
 487                 spin_lock_irqsave(&portdata->lock, flags);
 488                 portdata->outstanding_urbs--;
 489                 spin_unlock_irqrestore(&portdata->lock, flags);
 490                 goto error_simple;
 491         }
 492
 493         buffer = kmalloc(writesize, GFP_ATOMIC);
 494         if (!buffer) {
 495                 retval = -ENOMEM;
 496                 goto error_no_buffer;
 497         }
 498
 499         urb = usb_alloc_urb(0, GFP_ATOMIC);
 500         if (!urb) {
 501                 retval = -ENOMEM;
 502                 goto error_no_urb;
 503         }
 504
 505         memcpy(buffer, buf, writesize);
 506
 507         usb_serial_debug_data(&port->dev, __func__, writesize, buffer);
 508
 509         usb_fill_bulk_urb(urb, serial->dev,
 510                           usb_sndbulkpipe(serial->dev,
 511                                           port->bulk_out_endpointAddress),
 512                           buffer, writesize, sierra_outdat_callback, port);
 513
 514         /* Handle the need to send a zero length packet */
 515         urb->transfer_flags |= URB_ZERO_PACKET;
 516
 517         spin_lock_irqsave(&intfdata->susp_lock, flags);
 518
 519         if (intfdata->suspended) {
 520                 usb_anchor_urb(urb, &portdata->delayed);
 521                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 522                 goto skip_power;
 523         } else {
 524                 usb_anchor_urb(urb, &portdata->active);
 525         }
 526         /* send it down the pipe */
 527         retval = usb_submit_urb(urb, GFP_ATOMIC);
 528         if (retval) {
 529                 usb_unanchor_urb(urb);
 530                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 531                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
 532                         "with status = %d\n", __func__, retval);
 533                 goto error;
 534         } else {
 535                 intfdata->in_flight++;
 536                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 537         }
 538
 539 skip_power:
 540         /* we are done with this urb, so let the host driver
 541          * really free it when it is finished with it */
 542         usb_free_urb(urb);
 543
 544         return writesize;
 545 error:
 546         usb_free_urb(urb);
 547 error_no_urb:
 548         kfree(buffer);
 549 error_no_buffer:
 550         spin_lock_irqsave(&portdata->lock, flags);
 551         --portdata->outstanding_urbs;
 552         dev_dbg(&port->dev, "%s - 2. outstanding_urbs: %d\n", __func__,
 553                 portdata->outstanding_urbs);
 554         spin_unlock_irqrestore(&portdata->lock, flags);
 555         usb_autopm_put_interface_async(serial->interface);
 556 error_simple:
 557         return retval;
 558 }
 559
 560 static void sierra_indat_callback(struct urb *urb)
 561 {
 562         int err;
 563         int endpoint;
 564         struct usb_serial_port *port;
 565         unsigned char *data = urb->transfer_buffer;
 566         int status = urb->status;
 567
 568         endpoint = usb_pipeendpoint(urb->pipe);
 569         port = urb->context;
 570
 571         if (status) {
 572                 dev_dbg(&port->dev, "%s: nonzero status: %d on"
 573                         " endpoint %02x\n", __func__, status, endpoint);
 574         } else {
 575                 if (urb->actual_length) {
 576                         tty_insert_flip_string(&port->port, data,
 577                                 urb->actual_length);
 578                         tty_flip_buffer_push(&port->port);
 579
 580                         usb_serial_debug_data(&port->dev, __func__,
 581                                               urb->actual_length, data);
 582                 } else {
 583                         dev_dbg(&port->dev, "%s: empty read urb"
 584                                 " received\n", __func__);
 585                 }
 586         }
 587
 588         /* Resubmit urb so we continue receiving */
 589         if (status != -ESHUTDOWN && status != -EPERM) {
 590                 usb_mark_last_busy(port->serial->dev);
 591                 err = usb_submit_urb(urb, GFP_ATOMIC);
 592                 if (err && err != -EPERM)
 593                         dev_err(&port->dev, "resubmit read urb failed."
 594                                 "(%d)\n", err);
 595         }
 596 }
 597
 598 static void sierra_instat_callback(struct urb *urb)
 599 {
 600         int err;
 601         int status = urb->status;
 602         struct usb_serial_port *port =  urb->context;
 603         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 604         struct usb_serial *serial = port->serial;
 605
 606         dev_dbg(&port->dev, "%s: urb %p port %p has data %p\n", __func__,
 607                 urb, port, portdata);
 608
 609         if (status == 0) {
 610                 struct usb_ctrlrequest *req_pkt =
 611                                 (struct usb_ctrlrequest *)urb->transfer_buffer;
 612
 613                 if (!req_pkt) {
 614                         dev_dbg(&port->dev, "%s: NULL req_pkt\n",
 615                                 __func__);
 616                         return;
 617                 }
 618                 if ((req_pkt->bRequestType == 0xA1) &&
 619                                 (req_pkt->bRequest == 0x20)) {
 620                         int old_dcd_state;
 621                         unsigned char signals = *((unsigned char *)
 622                                         urb->transfer_buffer +
 623                                         sizeof(struct usb_ctrlrequest));
 624
 625                         dev_dbg(&port->dev, "%s: signal x%x\n", __func__,
 626                                 signals);
 627
 628                         old_dcd_state = portdata->dcd_state;
 629                         portdata->cts_state = 1;
 630                         portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
 631                         portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
 632                         portdata->ri_state = ((signals & 0x08) ? 1 : 0);
 633
 634                         if (old_dcd_state && !portdata->dcd_state)
 635                                 tty_port_tty_hangup(&port->port, true);
 636                 } else {
 637                         dev_dbg(&port->dev, "%s: type %x req %x\n",
 638                                 __func__, req_pkt->bRequestType,
 639                                 req_pkt->bRequest);
 640                 }
 641         } else
 642                 dev_dbg(&port->dev, "%s: error %d\n", __func__, status);
 643
 644         /* Resubmit urb so we continue receiving IRQ data */
 645         if (status != -ESHUTDOWN && status != -ENOENT) {
 646                 usb_mark_last_busy(serial->dev);
 647                 err = usb_submit_urb(urb, GFP_ATOMIC);
 648                 if (err && err != -EPERM)
 649                         dev_err(&port->dev, "%s: resubmit intr urb "
 650                                 "failed. (%d)\n", __func__, err);
 651         }
 652 }
 653
 654 static int sierra_write_room(struct tty_struct *tty)
 655 {
 656         struct usb_serial_port *port = tty->driver_data;
 657         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 658         unsigned long flags;
 659
 660         /* try to give a good number back based on if we have any free urbs at
 661          * this point in time */
 662         spin_lock_irqsave(&portdata->lock, flags);
 663         if (portdata->outstanding_urbs > (portdata->num_out_urbs * 2) / 3) {
 664                 spin_unlock_irqrestore(&portdata->lock, flags);
 665                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
 666                 return 0;
 667         }
 668         spin_unlock_irqrestore(&portdata->lock, flags);
 669
 670         return 2048;
 671 }
 672
 673 static int sierra_chars_in_buffer(struct tty_struct *tty)
 674 {
 675         struct usb_serial_port *port = tty->driver_data;
 676         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 677         unsigned long flags;
 678         int chars;
 679
 680         /* NOTE: This overcounts somewhat. */
 681         spin_lock_irqsave(&portdata->lock, flags);
 682         chars = portdata->outstanding_urbs * MAX_TRANSFER;
 683         spin_unlock_irqrestore(&portdata->lock, flags);
 684
 685         dev_dbg(&port->dev, "%s - %d\n", __func__, chars);
 686
 687         return chars;
 688 }
 689
 690 static void sierra_stop_rx_urbs(struct usb_serial_port *port)
 691 {
 692         int i;
 693         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 694
 695         for (i = 0; i < portdata->num_in_urbs; i++)
 696                 usb_kill_urb(portdata->in_urbs[i]);
 697
 698         usb_kill_urb(port->interrupt_in_urb);
 699 }
 700
 701 static int sierra_submit_rx_urbs(struct usb_serial_port *port, gfp_t mem_flags)
 702 {
 703         int ok_cnt;
 704         int err = -EINVAL;
 705         int i;
 706         struct urb *urb;
 707         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 708
 709         ok_cnt = 0;
 710         for (i = 0; i < portdata->num_in_urbs; i++) {
 711                 urb = portdata->in_urbs[i];
 712                 if (!urb)
 713                         continue;
 714                 err = usb_submit_urb(urb, mem_flags);
 715                 if (err) {
 716                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
 717                                 __func__, err);
 718                 } else {
 719                         ok_cnt++;
 720                 }
 721         }
 722
 723         if (ok_cnt && port->interrupt_in_urb) {
 724                 err = usb_submit_urb(port->interrupt_in_urb, mem_flags);
 725                 if (err) {
 726                         dev_err(&port->dev, "%s: submit intr urb failed: %d\n",
 727                                 __func__, err);
 728                 }
 729         }
 730
 731         if (ok_cnt > 0) /* at least one rx urb submitted */
 732                 return 0;
 733         else
 734                 return err;
 735 }
 736
 737 static struct urb *sierra_setup_urb(struct usb_serial *serial, int endpoint,
 738                                         int dir, void *ctx, int len,
 739                                         gfp_t mem_flags,
 740                                         usb_complete_t callback)
 741 {
 742         struct urb      *urb;
 743         u8              *buf;
 744
 745         urb = usb_alloc_urb(0, mem_flags);
 746         if (!urb)
 747                 return NULL;
 748
 749         buf = kmalloc(len, mem_flags);
 750         if (buf) {
 751                 /* Fill URB using supplied data */
 752                 usb_fill_bulk_urb(urb, serial->dev,
 753                         usb_sndbulkpipe(serial->dev, endpoint) | dir,
 754                         buf, len, callback, ctx);
 755
 756                 dev_dbg(&serial->dev->dev, "%s %c u : %p d:%p\n", __func__,
 757                                 dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
 758         } else {
 759                 sierra_release_urb(urb);
 760                 urb = NULL;
 761         }
 762
 763         return urb;
 764 }
 765
 766 static void sierra_close(struct usb_serial_port *port)
 767 {
 768         int i;
 769         struct usb_serial *serial = port->serial;
 770         struct sierra_port_private *portdata;
 771         struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
 772         struct urb *urb;
 773
 774         portdata = usb_get_serial_port_data(port);
 775
 776         /*
 777          * Need to take susp_lock to make sure port is not already being
 778          * resumed, but no need to hold it due to ASYNC_INITIALIZED.
 779          */
 780         spin_lock_irq(&intfdata->susp_lock);
 781         if (--intfdata->open_ports == 0)
 782                 serial->interface->needs_remote_wakeup = 0;
 783         spin_unlock_irq(&intfdata->susp_lock);
 784
 785         for (;;) {
 786                 urb = usb_get_from_anchor(&portdata->delayed);
 787                 if (!urb)
 788                         break;
 789                 kfree(urb->transfer_buffer);
 790                 usb_free_urb(urb);
 791                 usb_autopm_put_interface_async(serial->interface);
 792                 spin_lock(&portdata->lock);
 793                 portdata->outstanding_urbs--;
 794                 spin_unlock(&portdata->lock);
 795         }
 796
 797         sierra_stop_rx_urbs(port);
 798         usb_kill_anchored_urbs(&portdata->active);
 799
 800         for (i = 0; i < portdata->num_in_urbs; i++) {
 801                 sierra_release_urb(portdata->in_urbs[i]);
 802                 portdata->in_urbs[i] = NULL;
 803         }
 804
 805         usb_autopm_get_interface_no_resume(serial->interface);
 806 }
 807
 808 static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
 809 {
 810         struct sierra_port_private *portdata;
 811         struct usb_serial *serial = port->serial;
 812         struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
 813         int i;
 814         int err;
 815         int endpoint;
 816         struct urb *urb;
 817
 818         portdata = usb_get_serial_port_data(port);
 819
 820         endpoint = port->bulk_in_endpointAddress;
 821         for (i = 0; i < portdata->num_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                 goto err_submit;
 834
 835         spin_lock_irq(&intfdata->susp_lock);
 836         if (++intfdata->open_ports == 1)
 837                 serial->interface->needs_remote_wakeup = 1;
 838         spin_unlock_irq(&intfdata->susp_lock);
 839         usb_autopm_put_interface(serial->interface);
 840
 841         return 0;
 842
 843 err_submit:
 844         sierra_stop_rx_urbs(port);
 845
 846         for (i = 0; i < portdata->num_in_urbs; i++) {
 847                 sierra_release_urb(portdata->in_urbs[i]);
 848                 portdata->in_urbs[i] = NULL;
 849         }
 850
 851         return err;
 852 }
 853
 854
 855 static void sierra_dtr_rts(struct usb_serial_port *port, int on)
 856 {
 857         struct sierra_port_private *portdata;
 858
 859         portdata = usb_get_serial_port_data(port);
 860         portdata->rts_state = on;
 861         portdata->dtr_state = on;
 862
 863         sierra_send_setup(port);
 864 }
 865
 866 static int sierra_startup(struct usb_serial *serial)
 867 {
 868         struct sierra_intf_private *intfdata;
 869
 870         intfdata = kzalloc(sizeof(*intfdata), GFP_KERNEL);
 871         if (!intfdata)
 872                 return -ENOMEM;
 873
 874         spin_lock_init(&intfdata->susp_lock);
 875
 876         usb_set_serial_data(serial, intfdata);
 877
 878         /* Set Device mode to D0 */
 879         sierra_set_power_state(serial->dev, 0x0000);
 880
 881         /* Check NMEA and set */
 882         if (nmea)
 883                 sierra_vsc_set_nmea(serial->dev, 1);
 884
 885         return 0;
 886 }
 887
 888 static void sierra_release(struct usb_serial *serial)
 889 {
 890         struct sierra_intf_private *intfdata;
 891
 892         intfdata = usb_get_serial_data(serial);
 893         kfree(intfdata);
 894 }
 895
 896 static int sierra_port_probe(struct usb_serial_port *port)
 897 {
 898         struct usb_serial *serial = port->serial;
 899         struct sierra_port_private *portdata;
 900         const struct sierra_iface_info *himemoryp;
 901         u8 ifnum;
 902
 903         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 904         if (!portdata)
 905                 return -ENOMEM;
 906
 907         spin_lock_init(&portdata->lock);
 908         init_usb_anchor(&portdata->active);
 909         init_usb_anchor(&portdata->delayed);
 910
 911         /* Assume low memory requirements */
 912         portdata->num_out_urbs = N_OUT_URB;
 913         portdata->num_in_urbs  = N_IN_URB;
 914
 915         /* Determine actual memory requirements */
 916         if (serial->num_ports == 1) {
 917                 /* Get interface number for composite device */
 918                 ifnum = sierra_calc_interface(serial);
 919                 himemoryp = &typeB_interface_list;
 920         } else {
 921                 /* This is really the usb-serial port number of the interface
 922                  * rather than the interface number.
 923                  */
 924                 ifnum = port->port_number;
 925                 himemoryp = &typeA_interface_list;
 926         }
 927
 928         if (is_himemory(ifnum, himemoryp)) {
 929                 portdata->num_out_urbs = N_OUT_URB_HM;
 930                 portdata->num_in_urbs  = N_IN_URB_HM;
 931         }
 932
 933         dev_dbg(&port->dev,
 934                         "Memory usage (urbs) interface #%d, in=%d, out=%d\n",
 935                         ifnum, portdata->num_in_urbs, portdata->num_out_urbs);
 936
 937         usb_set_serial_port_data(port, portdata);
 938
 939         return 0;
 940 }
 941
 942 static int sierra_port_remove(struct usb_serial_port *port)
 943 {
 944         struct sierra_port_private *portdata;
 945
 946         portdata = usb_get_serial_port_data(port);
 947         usb_set_serial_port_data(port, NULL);
 948         kfree(portdata);
 949
 950         return 0;
 951 }
 952
 953 #ifdef CONFIG_PM
 954 static void stop_read_write_urbs(struct usb_serial *serial)
 955 {
 956         int i;
 957         struct usb_serial_port *port;
 958         struct sierra_port_private *portdata;
 959
 960         /* Stop reading/writing urbs */
 961         for (i = 0; i < serial->num_ports; ++i) {
 962                 port = serial->port[i];
 963                 portdata = usb_get_serial_port_data(port);
 964                 if (!portdata)
 965                         continue;
 966                 sierra_stop_rx_urbs(port);
 967                 usb_kill_anchored_urbs(&portdata->active);
 968         }
 969 }
 970
 971 static int sierra_suspend(struct usb_serial *serial, pm_message_t message)
 972 {
 973         struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
 974
 975         spin_lock_irq(&intfdata->susp_lock);
 976         if (PMSG_IS_AUTO(message)) {
 977                 if (intfdata->in_flight) {
 978                         spin_unlock_irq(&intfdata->susp_lock);
 979                         return -EBUSY;
 980                 }
 981         }
 982         intfdata->suspended = 1;
 983         spin_unlock_irq(&intfdata->susp_lock);
 984
 985         stop_read_write_urbs(serial);
 986
 987         return 0;
 988 }
 989
 990 /* Caller must hold susp_lock. */
 991 static int sierra_submit_delayed_urbs(struct usb_serial_port *port)
 992 {
 993         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 994         struct sierra_intf_private *intfdata;
 995         struct urb *urb;
 996         int ec = 0;
 997         int err;
 998
 999         intfdata = usb_get_serial_data(port->serial);
1000
1001         for (;;) {
1002                 urb = usb_get_from_anchor(&portdata->delayed);
1003                 if (!urb)
1004                         break;
1005
1006                 usb_anchor_urb(urb, &portdata->active);
1007                 intfdata->in_flight++;
1008                 err = usb_submit_urb(urb, GFP_ATOMIC);
1009                 if (err) {
1010                         dev_err(&port->dev, "%s - submit urb failed: %d",
1011                                         __func__, err);
1012                         ec++;
1013                         intfdata->in_flight--;
1014                         usb_unanchor_urb(urb);
1015                         kfree(urb->transfer_buffer);
1016                         usb_free_urb(urb);
1017
1018                         spin_lock(&portdata->lock);
1019                         portdata->outstanding_urbs--;
1020                         spin_unlock(&portdata->lock);
1021                 }
1022         }
1023
1024         if (ec)
1025                 return -EIO;
1026
1027         return 0;
1028 }
1029
1030 static int sierra_resume(struct usb_serial *serial)
1031 {
1032         struct usb_serial_port *port;
1033         struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
1034         int ec = 0;
1035         int i, err;
1036
1037         spin_lock_irq(&intfdata->susp_lock);
1038         for (i = 0; i < serial->num_ports; i++) {
1039                 port = serial->port[i];
1040
1041                 if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
1042                         continue;
1043
1044                 err = sierra_submit_delayed_urbs(port);
1045                 if (err)
1046                         ec++;
1047
1048                 err = sierra_submit_rx_urbs(port, GFP_ATOMIC);
1049                 if (err)
1050                         ec++;
1051         }
1052         intfdata->suspended = 0;
1053         spin_unlock_irq(&intfdata->susp_lock);
1054
1055         return ec ? -EIO : 0;
1056 }
1057
1058 #else
1059 #define sierra_suspend NULL
1060 #define sierra_resume NULL
1061 #endif
1062
1063 static struct usb_serial_driver sierra_device = {
1064         .driver = {
1065                 .owner =        THIS_MODULE,
1066                 .name =         "sierra",
1067         },
1068         .description       = "Sierra USB modem",
1069         .id_table          = id_table,
1070         .calc_num_ports    = sierra_calc_num_ports,
1071         .probe             = sierra_probe,
1072         .open              = sierra_open,
1073         .close             = sierra_close,
1074         .dtr_rts           = sierra_dtr_rts,
1075         .write             = sierra_write,
1076         .write_room        = sierra_write_room,
1077         .chars_in_buffer   = sierra_chars_in_buffer,
1078         .tiocmget          = sierra_tiocmget,
1079         .tiocmset          = sierra_tiocmset,
1080         .attach            = sierra_startup,
1081         .release           = sierra_release,
1082         .port_probe        = sierra_port_probe,
1083         .port_remove       = sierra_port_remove,
1084         .suspend           = sierra_suspend,
1085         .resume            = sierra_resume,
1086         .read_int_callback = sierra_instat_callback,
1087 };
1088
1089 static struct usb_serial_driver * const serial_drivers[] = {
1090         &sierra_device, NULL
1091 };
1092
1093 module_usb_serial_driver(serial_drivers, id_table);
1094
1095 MODULE_AUTHOR(DRIVER_AUTHOR);
1096 MODULE_DESCRIPTION(DRIVER_DESC);
1097 MODULE_LICENSE("GPL");
1098
1099 module_param(nmea, bool, S_IRUGO | S_IWUSR);
1100 MODULE_PARM_DESC(nmea, "NMEA streaming");