drivers/usb/serial/sierra.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3   USB Driver for Sierra Wireless
   4
   5   Copyright (C) 2006, 2007, 2008  Kevin Lloyd <klloyd@sierrawireless.com>,
   6
   7   Copyright (C) 2008, 2009  Elina Pasheva, Matthew Safar, Rory Filer
   8                         <linux@sierrawireless.com>
   9
  10   IMPORTANT DISCLAIMER: This driver is not commercially supported by
  11   Sierra Wireless. Use at your own risk.
  12
  13   Portions based on the option driver by Matthias Urlichs <smurf@smurf.noris.de>
  14   Whom based his on the Keyspan driver by Hugh Blemings <hugh@blemings.org>
  15 */
  16 /* Uncomment to log function calls */
  17 /* #define DEBUG */
  18
  19 #define DRIVER_AUTHOR "Kevin Lloyd, Elina Pasheva, Matthew Safar, Rory Filer"
  20 #define DRIVER_DESC "USB Driver for Sierra Wireless USB modems"
  21
  22 #include <linux/kernel.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/errno.h>
  25 #include <linux/tty.h>
  26 #include <linux/slab.h>
  27 #include <linux/tty_flip.h>
  28 #include <linux/module.h>
  29 #include <linux/usb.h>
  30 #include <linux/usb/serial.h>
  31
  32 #define SWIMS_USB_REQUEST_SetPower      0x00
  33 #define SWIMS_USB_REQUEST_SetNmea       0x07
  34
  35 #define N_IN_URB_HM     8
  36 #define N_OUT_URB_HM    64
  37 #define N_IN_URB        4
  38 #define N_OUT_URB       4
  39 #define IN_BUFLEN       4096
  40
  41 #define MAX_TRANSFER            (PAGE_SIZE - 512)
  42 /* MAX_TRANSFER is chosen so that the VM is not stressed by
  43    allocations > PAGE_SIZE and the number of packets in a page
  44    is an integer 512 is the largest possible packet on EHCI */
  45
  46 static bool nmea;
  47
  48 struct sierra_iface_list {
  49         const u8 *nums;         /* array of interface numbers */
  50         size_t count;           /* number of elements in array */
  51 };
  52
  53 struct sierra_intf_private {
  54         spinlock_t susp_lock;
  55         unsigned int suspended:1;
  56         int in_flight;
  57         unsigned int open_ports;
  58 };
  59
  60 static int sierra_set_power_state(struct usb_device *udev, __u16 swiState)
  61 {
  62         return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  63                         SWIMS_USB_REQUEST_SetPower,     /* __u8 request      */
  64                         USB_TYPE_VENDOR,                /* __u8 request type */
  65                         swiState,                       /* __u16 value       */
  66                         0,                              /* __u16 index       */
  67                         NULL,                           /* void *data        */
  68                         0,                              /* __u16 size        */
  69                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  70 }
  71
  72 static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable)
  73 {
  74         return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  75                         SWIMS_USB_REQUEST_SetNmea,      /* __u8 request      */
  76                         USB_TYPE_VENDOR,                /* __u8 request type */
  77                         enable,                         /* __u16 value       */
  78                         0x0000,                         /* __u16 index       */
  79                         NULL,                           /* void *data        */
  80                         0,                              /* __u16 size        */
  81                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  82 }
  83
  84 static int sierra_calc_num_ports(struct usb_serial *serial,
  85                                         struct usb_serial_endpoints *epds)
  86 {
  87         int num_ports = 0;
  88         u8 ifnum, numendpoints;
  89
  90         ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
  91         numendpoints = serial->interface->cur_altsetting->desc.bNumEndpoints;
  92
  93         /* Dummy interface present on some SKUs should be ignored */
  94         if (ifnum == 0x99)
  95                 num_ports = 0;
  96         else if (numendpoints <= 3)
  97                 num_ports = 1;
  98         else
  99                 num_ports = (numendpoints-1)/2;
 100         return num_ports;
 101 }
 102
 103 static bool is_listed(const u8 ifnum, const struct sierra_iface_list *list)
 104 {
 105         int i;
 106
 107         if (!list)
 108                 return false;
 109
 110         for (i = 0; i < list->count; i++) {
 111                 if (list->nums[i] == ifnum)
 112                         return true;
 113         }
 114
 115         return false;
 116 }
 117
 118 static u8 sierra_interface_num(struct usb_serial *serial)
 119 {
 120         return serial->interface->cur_altsetting->desc.bInterfaceNumber;
 121 }
 122
 123 static int sierra_probe(struct usb_serial *serial,
 124                         const struct usb_device_id *id)
 125 {
 126         const struct sierra_iface_list *ignore_list;
 127         int result = 0;
 128         struct usb_device *udev;
 129         u8 ifnum;
 130
 131         udev = serial->dev;
 132         ifnum = sierra_interface_num(serial);
 133
 134         /*
 135          * If this interface supports more than 1 alternate
 136          * select the 2nd one
 137          */
 138         if (serial->interface->num_altsetting == 2) {
 139                 dev_dbg(&udev->dev, "Selecting alt setting for interface %d\n",
 140                         ifnum);
 141                 /* We know the alternate setting is 1 for the MC8785 */
 142                 usb_set_interface(udev, ifnum, 1);
 143         }
 144
 145         ignore_list = (const struct sierra_iface_list *)id->driver_info;
 146
 147         if (is_listed(ifnum, ignore_list)) {
 148                 dev_dbg(&serial->dev->dev, "Ignoring interface #%d\n", ifnum);
 149                 return -ENODEV;
 150         }
 151
 152         return result;
 153 }
 154
 155 /* interfaces with higher memory requirements */
 156 static const u8 hi_memory_typeA_ifaces[] = { 0, 2 };
 157 static const struct sierra_iface_list typeA_interface_list = {
 158         .nums   = hi_memory_typeA_ifaces,
 159         .count  = ARRAY_SIZE(hi_memory_typeA_ifaces),
 160 };
 161
 162 static const u8 hi_memory_typeB_ifaces[] = { 3, 4, 5, 6 };
 163 static const struct sierra_iface_list typeB_interface_list = {
 164         .nums   = hi_memory_typeB_ifaces,
 165         .count  = ARRAY_SIZE(hi_memory_typeB_ifaces),
 166 };
 167
 168 /* 'ignorelist' of interfaces not served by this driver */
 169 static const u8 direct_ip_non_serial_ifaces[] = { 7, 8, 9, 10, 11, 19, 20 };
 170 static const struct sierra_iface_list direct_ip_interface_ignore = {
 171         .nums   = direct_ip_non_serial_ifaces,
 172         .count  = ARRAY_SIZE(direct_ip_non_serial_ifaces),
 173 };
 174
 175 static const struct usb_device_id id_table[] = {
 176         { USB_DEVICE(0x0F3D, 0x0112) }, /* Airprime/Sierra PC 5220 */
 177         { USB_DEVICE(0x03F0, 0x1B1D) }, /* HP ev2200 a.k.a MC5720 */
 178         { USB_DEVICE(0x03F0, 0x211D) }, /* HP ev2210 a.k.a MC5725 */
 179         { USB_DEVICE(0x03F0, 0x1E1D) }, /* HP hs2300 a.k.a MC8775 */
 180
 181         { USB_DEVICE(0x1199, 0x0017) }, /* Sierra Wireless EM5625 */
 182         { USB_DEVICE(0x1199, 0x0018) }, /* Sierra Wireless MC5720 */
 183         { USB_DEVICE(0x1199, 0x0218) }, /* Sierra Wireless MC5720 */
 184         { USB_DEVICE(0x1199, 0x0020) }, /* Sierra Wireless MC5725 */
 185         { USB_DEVICE(0x1199, 0x0220) }, /* Sierra Wireless MC5725 */
 186         { USB_DEVICE(0x1199, 0x0022) }, /* Sierra Wireless EM5725 */
 187         { USB_DEVICE(0x1199, 0x0024) }, /* Sierra Wireless MC5727 */
 188         { USB_DEVICE(0x1199, 0x0224) }, /* Sierra Wireless MC5727 */
 189         { USB_DEVICE(0x1199, 0x0019) }, /* Sierra Wireless AirCard 595 */
 190         { USB_DEVICE(0x1199, 0x0021) }, /* Sierra Wireless AirCard 597E */
 191         { USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless AirCard 580 */
 192         { USB_DEVICE(0x1199, 0x0120) }, /* Sierra Wireless USB Dongle 595U */
 193         { USB_DEVICE(0x1199, 0x0301) }, /* Sierra Wireless USB Dongle 250U */
 194         /* Sierra Wireless C597 */
 195         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0023, 0xFF, 0xFF, 0xFF) },
 196         /* Sierra Wireless T598 */
 197         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0025, 0xFF, 0xFF, 0xFF) },
 198         { USB_DEVICE(0x1199, 0x0026) }, /* Sierra Wireless T11 */
 199         { USB_DEVICE(0x1199, 0x0027) }, /* Sierra Wireless AC402 */
 200         { USB_DEVICE(0x1199, 0x0028) }, /* Sierra Wireless MC5728 */
 201         { USB_DEVICE(0x1199, 0x0029) }, /* Sierra Wireless Device */
 202
 203         { USB_DEVICE(0x1199, 0x6802) }, /* Sierra Wireless MC8755 */
 204         { USB_DEVICE(0x1199, 0x6803) }, /* Sierra Wireless MC8765 */
 205         { USB_DEVICE(0x1199, 0x6804) }, /* Sierra Wireless MC8755 */
 206         { USB_DEVICE(0x1199, 0x6805) }, /* Sierra Wireless MC8765 */
 207         { USB_DEVICE(0x1199, 0x6808) }, /* Sierra Wireless MC8755 */
 208         { USB_DEVICE(0x1199, 0x6809) }, /* Sierra Wireless MC8765 */
 209         { USB_DEVICE(0x1199, 0x6812) }, /* Sierra Wireless MC8775 & AC 875U */
 210         { USB_DEVICE(0x1199, 0x6813) }, /* Sierra Wireless MC8775 */
 211         { USB_DEVICE(0x1199, 0x6815) }, /* Sierra Wireless MC8775 */
 212         { USB_DEVICE(0x1199, 0x6816) }, /* Sierra Wireless MC8775 */
 213         { USB_DEVICE(0x1199, 0x6820) }, /* Sierra Wireless AirCard 875 */
 214         { USB_DEVICE(0x1199, 0x6821) }, /* Sierra Wireless AirCard 875U */
 215         { USB_DEVICE(0x1199, 0x6822) }, /* Sierra Wireless AirCard 875E */
 216         { USB_DEVICE(0x1199, 0x6832) }, /* Sierra Wireless MC8780 */
 217         { USB_DEVICE(0x1199, 0x6833) }, /* Sierra Wireless MC8781 */
 218         { USB_DEVICE(0x1199, 0x6834) }, /* Sierra Wireless MC8780 */
 219         { USB_DEVICE(0x1199, 0x6835) }, /* Sierra Wireless MC8781 */
 220         { USB_DEVICE(0x1199, 0x6838) }, /* Sierra Wireless MC8780 */
 221         { USB_DEVICE(0x1199, 0x6839) }, /* Sierra Wireless MC8781 */
 222         { USB_DEVICE(0x1199, 0x683A) }, /* Sierra Wireless MC8785 */
 223         { USB_DEVICE(0x1199, 0x683B) }, /* Sierra Wireless MC8785 Composite */
 224         /* Sierra Wireless MC8790, MC8791, MC8792 Composite */
 225         { USB_DEVICE(0x1199, 0x683C) },
 226         { USB_DEVICE(0x1199, 0x683D) }, /* Sierra Wireless MC8791 Composite */
 227         /* Sierra Wireless MC8790, MC8791, MC8792 */
 228         { USB_DEVICE(0x1199, 0x683E) },
 229         { USB_DEVICE(0x1199, 0x6850) }, /* Sierra Wireless AirCard 880 */
 230         { USB_DEVICE(0x1199, 0x6851) }, /* Sierra Wireless AirCard 881 */
 231         { USB_DEVICE(0x1199, 0x6852) }, /* Sierra Wireless AirCard 880 E */
 232         { USB_DEVICE(0x1199, 0x6853) }, /* Sierra Wireless AirCard 881 E */
 233         { USB_DEVICE(0x1199, 0x6855) }, /* Sierra Wireless AirCard 880 U */
 234         { USB_DEVICE(0x1199, 0x6856) }, /* Sierra Wireless AirCard 881 U */
 235         { USB_DEVICE(0x1199, 0x6859) }, /* Sierra Wireless AirCard 885 E */
 236         { USB_DEVICE(0x1199, 0x685A) }, /* Sierra Wireless AirCard 885 E */
 237         /* Sierra Wireless C885 */
 238         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6880, 0xFF, 0xFF, 0xFF)},
 239         /* Sierra Wireless C888, Air Card 501, USB 303, USB 304 */
 240         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6890, 0xFF, 0xFF, 0xFF)},
 241         /* Sierra Wireless C22/C33 */
 242         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6891, 0xFF, 0xFF, 0xFF)},
 243         /* Sierra Wireless HSPA Non-Composite Device */
 244         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6892, 0xFF, 0xFF, 0xFF)},
 245         { USB_DEVICE(0x1199, 0x6893) }, /* Sierra Wireless Device */
 246         /* Sierra Wireless Direct IP modems */
 247         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x68A3, 0xFF, 0xFF, 0xFF),
 248           .driver_info = (kernel_ulong_t)&direct_ip_interface_ignore
 249         },
 250         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x68AA, 0xFF, 0xFF, 0xFF),
 251           .driver_info = (kernel_ulong_t)&direct_ip_interface_ignore
 252         },
 253         { USB_DEVICE(0x1199, 0x68AB) }, /* Sierra Wireless AR8550 */
 254         /* AT&T Direct IP LTE modems */
 255         { USB_DEVICE_AND_INTERFACE_INFO(0x0F3D, 0x68AA, 0xFF, 0xFF, 0xFF),
 256           .driver_info = (kernel_ulong_t)&direct_ip_interface_ignore
 257         },
 258         /* Airprime/Sierra Wireless Direct IP modems */
 259         { USB_DEVICE_AND_INTERFACE_INFO(0x0F3D, 0x68A3, 0xFF, 0xFF, 0xFF),
 260           .driver_info = (kernel_ulong_t)&direct_ip_interface_ignore
 261         },
 262
 263         { }
 264 };
 265 MODULE_DEVICE_TABLE(usb, id_table);
 266
 267
 268 struct sierra_port_private {
 269         spinlock_t lock;        /* lock the structure */
 270         int outstanding_urbs;   /* number of out urbs in flight */
 271         struct usb_anchor active;
 272         struct usb_anchor delayed;
 273
 274         int num_out_urbs;
 275         int num_in_urbs;
 276         /* Input endpoints and buffers for this port */
 277         struct urb *in_urbs[N_IN_URB_HM];
 278
 279         /* Settings for the port */
 280         int rts_state;  /* Handshaking pins (outputs) */
 281         int dtr_state;
 282         int cts_state;  /* Handshaking pins (inputs) */
 283         int dsr_state;
 284         int dcd_state;
 285         int ri_state;
 286 };
 287
 288 static int sierra_send_setup(struct usb_serial_port *port)
 289 {
 290         struct usb_serial *serial = port->serial;
 291         struct sierra_port_private *portdata;
 292         __u16 interface = 0;
 293         int val = 0;
 294         int do_send = 0;
 295         int retval;
 296
 297         portdata = usb_get_serial_port_data(port);
 298
 299         if (portdata->dtr_state)
 300                 val |= 0x01;
 301         if (portdata->rts_state)
 302                 val |= 0x02;
 303
 304         /* If composite device then properly report interface */
 305         if (serial->num_ports == 1) {
 306                 interface = sierra_interface_num(serial);
 307                 /* Control message is sent only to interfaces with
 308                  * interrupt_in endpoints
 309                  */
 310                 if (port->interrupt_in_urb) {
 311                         /* send control message */
 312                         do_send = 1;
 313                 }
 314         }
 315
 316         /* Otherwise the need to do non-composite mapping */
 317         else {
 318                 if (port->bulk_out_endpointAddress == 2)
 319                         interface = 0;
 320                 else if (port->bulk_out_endpointAddress == 4)
 321                         interface = 1;
 322                 else if (port->bulk_out_endpointAddress == 5)
 323                         interface = 2;
 324
 325                 do_send = 1;
 326         }
 327         if (!do_send)
 328                 return 0;
 329
 330         retval = usb_autopm_get_interface(serial->interface);
 331         if (retval < 0)
 332                 return retval;
 333
 334         retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 335                 0x22, 0x21, val, interface, NULL, 0, USB_CTRL_SET_TIMEOUT);
 336         usb_autopm_put_interface(serial->interface);
 337
 338         return retval;
 339 }
 340
 341 static int sierra_tiocmget(struct tty_struct *tty)
 342 {
 343         struct usb_serial_port *port = tty->driver_data;
 344         unsigned int value;
 345         struct sierra_port_private *portdata;
 346
 347         portdata = usb_get_serial_port_data(port);
 348
 349         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
 350                 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
 351                 ((portdata->cts_state) ? TIOCM_CTS : 0) |
 352                 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
 353                 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
 354                 ((portdata->ri_state) ? TIOCM_RNG : 0);
 355
 356         return value;
 357 }
 358
 359 static int sierra_tiocmset(struct tty_struct *tty,
 360                         unsigned int set, unsigned int clear)
 361 {
 362         struct usb_serial_port *port = tty->driver_data;
 363         struct sierra_port_private *portdata;
 364
 365         portdata = usb_get_serial_port_data(port);
 366
 367         if (set & TIOCM_RTS)
 368                 portdata->rts_state = 1;
 369         if (set & TIOCM_DTR)
 370                 portdata->dtr_state = 1;
 371
 372         if (clear & TIOCM_RTS)
 373                 portdata->rts_state = 0;
 374         if (clear & TIOCM_DTR)
 375                 portdata->dtr_state = 0;
 376         return sierra_send_setup(port);
 377 }
 378
 379 static void sierra_release_urb(struct urb *urb)
 380 {
 381         if (urb) {
 382                 kfree(urb->transfer_buffer);
 383                 usb_free_urb(urb);
 384         }
 385 }
 386
 387 static void sierra_outdat_callback(struct urb *urb)
 388 {
 389         struct usb_serial_port *port = urb->context;
 390         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 391         struct sierra_intf_private *intfdata;
 392         int status = urb->status;
 393         unsigned long flags;
 394
 395         intfdata = usb_get_serial_data(port->serial);
 396
 397         /* free up the transfer buffer, as usb_free_urb() does not do this */
 398         kfree(urb->transfer_buffer);
 399         usb_autopm_put_interface_async(port->serial->interface);
 400         if (status)
 401                 dev_dbg(&port->dev, "%s - nonzero write bulk status "
 402                     "received: %d\n", __func__, status);
 403
 404         spin_lock_irqsave(&portdata->lock, flags);
 405         --portdata->outstanding_urbs;
 406         spin_unlock_irqrestore(&portdata->lock, flags);
 407         spin_lock_irqsave(&intfdata->susp_lock, flags);
 408         --intfdata->in_flight;
 409         spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 410
 411         usb_serial_port_softint(port);
 412 }
 413
 414 /* Write */
 415 static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
 416                                         const unsigned char *buf, int count)
 417 {
 418         struct sierra_port_private *portdata;
 419         struct sierra_intf_private *intfdata;
 420         struct usb_serial *serial = port->serial;
 421         unsigned long flags;
 422         unsigned char *buffer;
 423         struct urb *urb;
 424         size_t writesize = min((size_t)count, (size_t)MAX_TRANSFER);
 425         int retval = 0;
 426
 427         /* verify that we actually have some data to write */
 428         if (count == 0)
 429                 return 0;
 430
 431         portdata = usb_get_serial_port_data(port);
 432         intfdata = usb_get_serial_data(serial);
 433
 434         dev_dbg(&port->dev, "%s: write (%zd bytes)\n", __func__, writesize);
 435         spin_lock_irqsave(&portdata->lock, flags);
 436         dev_dbg(&port->dev, "%s - outstanding_urbs: %d\n", __func__,
 437                 portdata->outstanding_urbs);
 438         if (portdata->outstanding_urbs > portdata->num_out_urbs) {
 439                 spin_unlock_irqrestore(&portdata->lock, flags);
 440                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
 441                 return 0;
 442         }
 443         portdata->outstanding_urbs++;
 444         dev_dbg(&port->dev, "%s - 1, outstanding_urbs: %d\n", __func__,
 445                 portdata->outstanding_urbs);
 446         spin_unlock_irqrestore(&portdata->lock, flags);
 447
 448         retval = usb_autopm_get_interface_async(serial->interface);
 449         if (retval < 0) {
 450                 spin_lock_irqsave(&portdata->lock, flags);
 451                 portdata->outstanding_urbs--;
 452                 spin_unlock_irqrestore(&portdata->lock, flags);
 453                 goto error_simple;
 454         }
 455
 456         buffer = kmalloc(writesize, GFP_ATOMIC);
 457         if (!buffer) {
 458                 retval = -ENOMEM;
 459                 goto error_no_buffer;
 460         }
 461
 462         urb = usb_alloc_urb(0, GFP_ATOMIC);
 463         if (!urb) {
 464                 retval = -ENOMEM;
 465                 goto error_no_urb;
 466         }
 467
 468         memcpy(buffer, buf, writesize);
 469
 470         usb_serial_debug_data(&port->dev, __func__, writesize, buffer);
 471
 472         usb_fill_bulk_urb(urb, serial->dev,
 473                           usb_sndbulkpipe(serial->dev,
 474                                           port->bulk_out_endpointAddress),
 475                           buffer, writesize, sierra_outdat_callback, port);
 476
 477         /* Handle the need to send a zero length packet */
 478         urb->transfer_flags |= URB_ZERO_PACKET;
 479
 480         spin_lock_irqsave(&intfdata->susp_lock, flags);
 481
 482         if (intfdata->suspended) {
 483                 usb_anchor_urb(urb, &portdata->delayed);
 484                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 485                 goto skip_power;
 486         } else {
 487                 usb_anchor_urb(urb, &portdata->active);
 488         }
 489         /* send it down the pipe */
 490         retval = usb_submit_urb(urb, GFP_ATOMIC);
 491         if (retval) {
 492                 usb_unanchor_urb(urb);
 493                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 494                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
 495                         "with status = %d\n", __func__, retval);
 496                 goto error;
 497         } else {
 498                 intfdata->in_flight++;
 499                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 500         }
 501
 502 skip_power:
 503         /* we are done with this urb, so let the host driver
 504          * really free it when it is finished with it */
 505         usb_free_urb(urb);
 506
 507         return writesize;
 508 error:
 509         usb_free_urb(urb);
 510 error_no_urb:
 511         kfree(buffer);
 512 error_no_buffer:
 513         spin_lock_irqsave(&portdata->lock, flags);
 514         --portdata->outstanding_urbs;
 515         dev_dbg(&port->dev, "%s - 2. outstanding_urbs: %d\n", __func__,
 516                 portdata->outstanding_urbs);
 517         spin_unlock_irqrestore(&portdata->lock, flags);
 518         usb_autopm_put_interface_async(serial->interface);
 519 error_simple:
 520         return retval;
 521 }
 522
 523 static void sierra_indat_callback(struct urb *urb)
 524 {
 525         int err;
 526         int endpoint;
 527         struct usb_serial_port *port;
 528         unsigned char *data = urb->transfer_buffer;
 529         int status = urb->status;
 530
 531         endpoint = usb_pipeendpoint(urb->pipe);
 532         port = urb->context;
 533
 534         if (status) {
 535                 dev_dbg(&port->dev, "%s: nonzero status: %d on"
 536                         " endpoint %02x\n", __func__, status, endpoint);
 537         } else {
 538                 if (urb->actual_length) {
 539                         tty_insert_flip_string(&port->port, data,
 540                                 urb->actual_length);
 541                         tty_flip_buffer_push(&port->port);
 542
 543                         usb_serial_debug_data(&port->dev, __func__,
 544                                               urb->actual_length, data);
 545                 } else {
 546                         dev_dbg(&port->dev, "%s: empty read urb"
 547                                 " received\n", __func__);
 548                 }
 549         }
 550
 551         /* Resubmit urb so we continue receiving */
 552         if (status != -ESHUTDOWN && status != -EPERM) {
 553                 usb_mark_last_busy(port->serial->dev);
 554                 err = usb_submit_urb(urb, GFP_ATOMIC);
 555                 if (err && err != -EPERM)
 556                         dev_err(&port->dev, "resubmit read urb failed."
 557                                 "(%d)\n", err);
 558         }
 559 }
 560
 561 static void sierra_instat_callback(struct urb *urb)
 562 {
 563         int err;
 564         int status = urb->status;
 565         struct usb_serial_port *port =  urb->context;
 566         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 567         struct usb_serial *serial = port->serial;
 568
 569         dev_dbg(&port->dev, "%s: urb %p port %p has data %p\n", __func__,
 570                 urb, port, portdata);
 571
 572         if (status == 0) {
 573                 struct usb_ctrlrequest *req_pkt = urb->transfer_buffer;
 574
 575                 if (!req_pkt) {
 576                         dev_dbg(&port->dev, "%s: NULL req_pkt\n",
 577                                 __func__);
 578                         return;
 579                 }
 580                 if ((req_pkt->bRequestType == 0xA1) &&
 581                                 (req_pkt->bRequest == 0x20)) {
 582                         int old_dcd_state;
 583                         unsigned char signals = *((unsigned char *)
 584                                         urb->transfer_buffer +
 585                                         sizeof(struct usb_ctrlrequest));
 586
 587                         dev_dbg(&port->dev, "%s: signal x%x\n", __func__,
 588                                 signals);
 589
 590                         old_dcd_state = portdata->dcd_state;
 591                         portdata->cts_state = 1;
 592                         portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
 593                         portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
 594                         portdata->ri_state = ((signals & 0x08) ? 1 : 0);
 595
 596                         if (old_dcd_state && !portdata->dcd_state)
 597                                 tty_port_tty_hangup(&port->port, true);
 598                 } else {
 599                         dev_dbg(&port->dev, "%s: type %x req %x\n",
 600                                 __func__, req_pkt->bRequestType,
 601                                 req_pkt->bRequest);
 602                 }
 603         } else
 604                 dev_dbg(&port->dev, "%s: error %d\n", __func__, status);
 605
 606         /* Resubmit urb so we continue receiving IRQ data */
 607         if (status != -ESHUTDOWN && status != -ENOENT) {
 608                 usb_mark_last_busy(serial->dev);
 609                 err = usb_submit_urb(urb, GFP_ATOMIC);
 610                 if (err && err != -EPERM)
 611                         dev_err(&port->dev, "%s: resubmit intr urb "
 612                                 "failed. (%d)\n", __func__, err);
 613         }
 614 }
 615
 616 static unsigned int sierra_write_room(struct tty_struct *tty)
 617 {
 618         struct usb_serial_port *port = tty->driver_data;
 619         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 620         unsigned long flags;
 621
 622         /* try to give a good number back based on if we have any free urbs at
 623          * this point in time */
 624         spin_lock_irqsave(&portdata->lock, flags);
 625         if (portdata->outstanding_urbs > (portdata->num_out_urbs * 2) / 3) {
 626                 spin_unlock_irqrestore(&portdata->lock, flags);
 627                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
 628                 return 0;
 629         }
 630         spin_unlock_irqrestore(&portdata->lock, flags);
 631
 632         return 2048;
 633 }
 634
 635 static unsigned int sierra_chars_in_buffer(struct tty_struct *tty)
 636 {
 637         struct usb_serial_port *port = tty->driver_data;
 638         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 639         unsigned long flags;
 640         unsigned int chars;
 641
 642         /* NOTE: This overcounts somewhat. */
 643         spin_lock_irqsave(&portdata->lock, flags);
 644         chars = portdata->outstanding_urbs * MAX_TRANSFER;
 645         spin_unlock_irqrestore(&portdata->lock, flags);
 646
 647         dev_dbg(&port->dev, "%s - %u\n", __func__, chars);
 648
 649         return chars;
 650 }
 651
 652 static void sierra_stop_rx_urbs(struct usb_serial_port *port)
 653 {
 654         int i;
 655         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 656
 657         for (i = 0; i < portdata->num_in_urbs; i++)
 658                 usb_kill_urb(portdata->in_urbs[i]);
 659
 660         usb_kill_urb(port->interrupt_in_urb);
 661 }
 662
 663 static int sierra_submit_rx_urbs(struct usb_serial_port *port, gfp_t mem_flags)
 664 {
 665         int ok_cnt;
 666         int err = -EINVAL;
 667         int i;
 668         struct urb *urb;
 669         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 670
 671         ok_cnt = 0;
 672         for (i = 0; i < portdata->num_in_urbs; i++) {
 673                 urb = portdata->in_urbs[i];
 674                 if (!urb)
 675                         continue;
 676                 err = usb_submit_urb(urb, mem_flags);
 677                 if (err) {
 678                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
 679                                 __func__, err);
 680                 } else {
 681                         ok_cnt++;
 682                 }
 683         }
 684
 685         if (ok_cnt && port->interrupt_in_urb) {
 686                 err = usb_submit_urb(port->interrupt_in_urb, mem_flags);
 687                 if (err) {
 688                         dev_err(&port->dev, "%s: submit intr urb failed: %d\n",
 689                                 __func__, err);
 690                 }
 691         }
 692
 693         if (ok_cnt > 0) /* at least one rx urb submitted */
 694                 return 0;
 695         else
 696                 return err;
 697 }
 698
 699 static struct urb *sierra_setup_urb(struct usb_serial *serial, int endpoint,
 700                                         int dir, void *ctx, int len,
 701                                         gfp_t mem_flags,
 702                                         usb_complete_t callback)
 703 {
 704         struct urb      *urb;
 705         u8              *buf;
 706
 707         urb = usb_alloc_urb(0, mem_flags);
 708         if (!urb)
 709                 return NULL;
 710
 711         buf = kmalloc(len, mem_flags);
 712         if (buf) {
 713                 /* Fill URB using supplied data */
 714                 usb_fill_bulk_urb(urb, serial->dev,
 715                         usb_sndbulkpipe(serial->dev, endpoint) | dir,
 716                         buf, len, callback, ctx);
 717
 718                 dev_dbg(&serial->dev->dev, "%s %c u : %p d:%p\n", __func__,
 719                                 dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
 720         } else {
 721                 sierra_release_urb(urb);
 722                 urb = NULL;
 723         }
 724
 725         return urb;
 726 }
 727
 728 static void sierra_close(struct usb_serial_port *port)
 729 {
 730         int i;
 731         struct usb_serial *serial = port->serial;
 732         struct sierra_port_private *portdata;
 733         struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
 734         struct urb *urb;
 735
 736         portdata = usb_get_serial_port_data(port);
 737
 738         /*
 739          * Need to take susp_lock to make sure port is not already being
 740          * resumed, but no need to hold it due to the tty-port initialized
 741          * flag.
 742          */
 743         spin_lock_irq(&intfdata->susp_lock);
 744         if (--intfdata->open_ports == 0)
 745                 serial->interface->needs_remote_wakeup = 0;
 746         spin_unlock_irq(&intfdata->susp_lock);
 747
 748         for (;;) {
 749                 urb = usb_get_from_anchor(&portdata->delayed);
 750                 if (!urb)
 751                         break;
 752                 kfree(urb->transfer_buffer);
 753                 usb_free_urb(urb);
 754                 usb_autopm_put_interface_async(serial->interface);
 755                 spin_lock_irq(&portdata->lock);
 756                 portdata->outstanding_urbs--;
 757                 spin_unlock_irq(&portdata->lock);
 758         }
 759
 760         sierra_stop_rx_urbs(port);
 761         usb_kill_anchored_urbs(&portdata->active);
 762
 763         for (i = 0; i < portdata->num_in_urbs; i++) {
 764                 sierra_release_urb(portdata->in_urbs[i]);
 765                 portdata->in_urbs[i] = NULL;
 766         }
 767
 768         usb_autopm_get_interface_no_resume(serial->interface);
 769 }
 770
 771 static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
 772 {
 773         struct sierra_port_private *portdata;
 774         struct usb_serial *serial = port->serial;
 775         struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
 776         int i;
 777         int err;
 778         int endpoint;
 779         struct urb *urb;
 780
 781         portdata = usb_get_serial_port_data(port);
 782
 783         endpoint = port->bulk_in_endpointAddress;
 784         for (i = 0; i < portdata->num_in_urbs; i++) {
 785                 urb = sierra_setup_urb(serial, endpoint, USB_DIR_IN, port,
 786                                         IN_BUFLEN, GFP_KERNEL,
 787                                         sierra_indat_callback);
 788                 portdata->in_urbs[i] = urb;
 789         }
 790         /* clear halt condition */
 791         usb_clear_halt(serial->dev,
 792                         usb_sndbulkpipe(serial->dev, endpoint) | USB_DIR_IN);
 793
 794         err = sierra_submit_rx_urbs(port, GFP_KERNEL);
 795         if (err)
 796                 goto err_submit;
 797
 798         spin_lock_irq(&intfdata->susp_lock);
 799         if (++intfdata->open_ports == 1)
 800                 serial->interface->needs_remote_wakeup = 1;
 801         spin_unlock_irq(&intfdata->susp_lock);
 802         usb_autopm_put_interface(serial->interface);
 803
 804         return 0;
 805
 806 err_submit:
 807         sierra_stop_rx_urbs(port);
 808
 809         for (i = 0; i < portdata->num_in_urbs; i++) {
 810                 sierra_release_urb(portdata->in_urbs[i]);
 811                 portdata->in_urbs[i] = NULL;
 812         }
 813
 814         return err;
 815 }
 816
 817
 818 static void sierra_dtr_rts(struct usb_serial_port *port, int on)
 819 {
 820         struct sierra_port_private *portdata;
 821
 822         portdata = usb_get_serial_port_data(port);
 823         portdata->rts_state = on;
 824         portdata->dtr_state = on;
 825
 826         sierra_send_setup(port);
 827 }
 828
 829 static int sierra_startup(struct usb_serial *serial)
 830 {
 831         struct sierra_intf_private *intfdata;
 832
 833         intfdata = kzalloc(sizeof(*intfdata), GFP_KERNEL);
 834         if (!intfdata)
 835                 return -ENOMEM;
 836
 837         spin_lock_init(&intfdata->susp_lock);
 838
 839         usb_set_serial_data(serial, intfdata);
 840
 841         /* Set Device mode to D0 */
 842         sierra_set_power_state(serial->dev, 0x0000);
 843
 844         /* Check NMEA and set */
 845         if (nmea)
 846                 sierra_vsc_set_nmea(serial->dev, 1);
 847
 848         return 0;
 849 }
 850
 851 static void sierra_release(struct usb_serial *serial)
 852 {
 853         struct sierra_intf_private *intfdata;
 854
 855         intfdata = usb_get_serial_data(serial);
 856         kfree(intfdata);
 857 }
 858
 859 static int sierra_port_probe(struct usb_serial_port *port)
 860 {
 861         struct usb_serial *serial = port->serial;
 862         struct sierra_port_private *portdata;
 863         const struct sierra_iface_list *himemory_list;
 864         u8 ifnum;
 865
 866         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 867         if (!portdata)
 868                 return -ENOMEM;
 869
 870         spin_lock_init(&portdata->lock);
 871         init_usb_anchor(&portdata->active);
 872         init_usb_anchor(&portdata->delayed);
 873
 874         /* Assume low memory requirements */
 875         portdata->num_out_urbs = N_OUT_URB;
 876         portdata->num_in_urbs  = N_IN_URB;
 877
 878         /* Determine actual memory requirements */
 879         if (serial->num_ports == 1) {
 880                 /* Get interface number for composite device */
 881                 ifnum = sierra_interface_num(serial);
 882                 himemory_list = &typeB_interface_list;
 883         } else {
 884                 /* This is really the usb-serial port number of the interface
 885                  * rather than the interface number.
 886                  */
 887                 ifnum = port->port_number;
 888                 himemory_list = &typeA_interface_list;
 889         }
 890
 891         if (is_listed(ifnum, himemory_list)) {
 892                 portdata->num_out_urbs = N_OUT_URB_HM;
 893                 portdata->num_in_urbs  = N_IN_URB_HM;
 894         }
 895
 896         dev_dbg(&port->dev,
 897                         "Memory usage (urbs) interface #%d, in=%d, out=%d\n",
 898                         ifnum, portdata->num_in_urbs, portdata->num_out_urbs);
 899
 900         usb_set_serial_port_data(port, portdata);
 901
 902         return 0;
 903 }
 904
 905 static void sierra_port_remove(struct usb_serial_port *port)
 906 {
 907         struct sierra_port_private *portdata;
 908
 909         portdata = usb_get_serial_port_data(port);
 910         usb_set_serial_port_data(port, NULL);
 911         kfree(portdata);
 912 }
 913
 914 #ifdef CONFIG_PM
 915 static void stop_read_write_urbs(struct usb_serial *serial)
 916 {
 917         int i;
 918         struct usb_serial_port *port;
 919         struct sierra_port_private *portdata;
 920
 921         /* Stop reading/writing urbs */
 922         for (i = 0; i < serial->num_ports; ++i) {
 923                 port = serial->port[i];
 924                 portdata = usb_get_serial_port_data(port);
 925                 if (!portdata)
 926                         continue;
 927                 sierra_stop_rx_urbs(port);
 928                 usb_kill_anchored_urbs(&portdata->active);
 929         }
 930 }
 931
 932 static int sierra_suspend(struct usb_serial *serial, pm_message_t message)
 933 {
 934         struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
 935
 936         spin_lock_irq(&intfdata->susp_lock);
 937         if (PMSG_IS_AUTO(message)) {
 938                 if (intfdata->in_flight) {
 939                         spin_unlock_irq(&intfdata->susp_lock);
 940                         return -EBUSY;
 941                 }
 942         }
 943         intfdata->suspended = 1;
 944         spin_unlock_irq(&intfdata->susp_lock);
 945
 946         stop_read_write_urbs(serial);
 947
 948         return 0;
 949 }
 950
 951 /* Caller must hold susp_lock. */
 952 static int sierra_submit_delayed_urbs(struct usb_serial_port *port)
 953 {
 954         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 955         struct sierra_intf_private *intfdata;
 956         struct urb *urb;
 957         int ec = 0;
 958         int err;
 959
 960         intfdata = usb_get_serial_data(port->serial);
 961
 962         for (;;) {
 963                 urb = usb_get_from_anchor(&portdata->delayed);
 964                 if (!urb)
 965                         break;
 966
 967                 usb_anchor_urb(urb, &portdata->active);
 968                 intfdata->in_flight++;
 969                 err = usb_submit_urb(urb, GFP_ATOMIC);
 970                 if (err) {
 971                         dev_err(&port->dev, "%s - submit urb failed: %d",
 972                                         __func__, err);
 973                         ec++;
 974                         intfdata->in_flight--;
 975                         usb_unanchor_urb(urb);
 976                         kfree(urb->transfer_buffer);
 977                         usb_free_urb(urb);
 978
 979                         spin_lock(&portdata->lock);
 980                         portdata->outstanding_urbs--;
 981                         spin_unlock(&portdata->lock);
 982                 }
 983         }
 984
 985         if (ec)
 986                 return -EIO;
 987
 988         return 0;
 989 }
 990
 991 static int sierra_resume(struct usb_serial *serial)
 992 {
 993         struct usb_serial_port *port;
 994         struct sierra_intf_private *intfdata = usb_get_serial_data(serial);
 995         int ec = 0;
 996         int i, err;
 997
 998         spin_lock_irq(&intfdata->susp_lock);
 999         for (i = 0; i < serial->num_ports; i++) {
1000                 port = serial->port[i];
1001
1002                 if (!tty_port_initialized(&port->port))
1003                         continue;
1004
1005                 err = sierra_submit_delayed_urbs(port);
1006                 if (err)
1007                         ec++;
1008
1009                 err = sierra_submit_rx_urbs(port, GFP_ATOMIC);
1010                 if (err)
1011                         ec++;
1012         }
1013         intfdata->suspended = 0;
1014         spin_unlock_irq(&intfdata->susp_lock);
1015
1016         return ec ? -EIO : 0;
1017 }
1018
1019 #else
1020 #define sierra_suspend NULL
1021 #define sierra_resume NULL
1022 #endif
1023
1024 static struct usb_serial_driver sierra_device = {
1025         .driver = {
1026                 .owner =        THIS_MODULE,
1027                 .name =         "sierra",
1028         },
1029         .description       = "Sierra USB modem",
1030         .id_table          = id_table,
1031         .calc_num_ports    = sierra_calc_num_ports,
1032         .probe             = sierra_probe,
1033         .open              = sierra_open,
1034         .close             = sierra_close,
1035         .dtr_rts           = sierra_dtr_rts,
1036         .write             = sierra_write,
1037         .write_room        = sierra_write_room,
1038         .chars_in_buffer   = sierra_chars_in_buffer,
1039         .tiocmget          = sierra_tiocmget,
1040         .tiocmset          = sierra_tiocmset,
1041         .attach            = sierra_startup,
1042         .release           = sierra_release,
1043         .port_probe        = sierra_port_probe,
1044         .port_remove       = sierra_port_remove,
1045         .suspend           = sierra_suspend,
1046         .resume            = sierra_resume,
1047         .read_int_callback = sierra_instat_callback,
1048 };
1049
1050 static struct usb_serial_driver * const serial_drivers[] = {
1051         &sierra_device, NULL
1052 };
1053
1054 module_usb_serial_driver(serial_drivers, id_table);
1055
1056 MODULE_AUTHOR(DRIVER_AUTHOR);
1057 MODULE_DESCRIPTION(DRIVER_DESC);
1058 MODULE_LICENSE("GPL v2");
1059
1060 module_param(nmea, bool, 0644);
1061 MODULE_PARM_DESC(nmea, "NMEA streaming");