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 #define DRIVER_VERSION "v.1.7.16"
  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 int debug;
  50 static int nmea;
  51
  52 /* Used in interface blacklisting */
  53 struct sierra_iface_info {
  54         const u32 infolen;      /* number of interface numbers on blacklist */
  55         const u8  *ifaceinfo;   /* pointer to the array holding the numbers */
  56 };
  57
  58 struct sierra_intf_private {
  59         spinlock_t susp_lock;
  60         unsigned int suspended:1;
  61         int in_flight;
  62 };
  63
  64 static int sierra_set_power_state(struct usb_device *udev, __u16 swiState)
  65 {
  66         int result;
  67         dev_dbg(&udev->dev, "%s\n", __func__);
  68         result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  69                         SWIMS_USB_REQUEST_SetPower,     /* __u8 request      */
  70                         USB_TYPE_VENDOR,                /* __u8 request type */
  71                         swiState,                       /* __u16 value       */
  72                         0,                              /* __u16 index       */
  73                         NULL,                           /* void *data        */
  74                         0,                              /* __u16 size        */
  75                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  76         return result;
  77 }
  78
  79 static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable)
  80 {
  81         int result;
  82         dev_dbg(&udev->dev, "%s\n", __func__);
  83         result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  84                         SWIMS_USB_REQUEST_SetNmea,      /* __u8 request      */
  85                         USB_TYPE_VENDOR,                /* __u8 request type */
  86                         enable,                         /* __u16 value       */
  87                         0x0000,                         /* __u16 index       */
  88                         NULL,                           /* void *data        */
  89                         0,                              /* __u16 size        */
  90                         USB_CTRL_SET_TIMEOUT);          /* int timeout       */
  91         return result;
  92 }
  93
  94 static int sierra_calc_num_ports(struct usb_serial *serial)
  95 {
  96         int num_ports = 0;
  97         u8 ifnum, numendpoints;
  98
  99         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 100
 101         ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
 102         numendpoints = serial->interface->cur_altsetting->desc.bNumEndpoints;
 103
 104         /* Dummy interface present on some SKUs should be ignored */
 105         if (ifnum == 0x99)
 106                 num_ports = 0;
 107         else if (numendpoints <= 3)
 108                 num_ports = 1;
 109         else
 110                 num_ports = (numendpoints-1)/2;
 111         return num_ports;
 112 }
 113
 114 static int is_blacklisted(const u8 ifnum,
 115                                 const struct sierra_iface_info *blacklist)
 116 {
 117         const u8  *info;
 118         int i;
 119
 120         if (blacklist) {
 121                 info = blacklist->ifaceinfo;
 122
 123                 for (i = 0; i < blacklist->infolen; i++) {
 124                         if (info[i] == ifnum)
 125                                 return 1;
 126                 }
 127         }
 128         return 0;
 129 }
 130
 131 static int is_himemory(const u8 ifnum,
 132                                 const struct sierra_iface_info *himemorylist)
 133 {
 134         const u8  *info;
 135         int i;
 136
 137         if (himemorylist) {
 138                 info = himemorylist->ifaceinfo;
 139
 140                 for (i=0; i < himemorylist->infolen; i++) {
 141                         if (info[i] == ifnum)
 142                                 return 1;
 143                 }
 144         }
 145         return 0;
 146 }
 147
 148 static int sierra_calc_interface(struct usb_serial *serial)
 149 {
 150         int interface;
 151         struct usb_interface *p_interface;
 152         struct usb_host_interface *p_host_interface;
 153         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 154
 155         /* Get the interface structure pointer from the serial struct */
 156         p_interface = serial->interface;
 157
 158         /* Get a pointer to the host interface structure */
 159         p_host_interface = p_interface->cur_altsetting;
 160
 161         /* read the interface descriptor for this active altsetting
 162          * to find out the interface number we are on
 163         */
 164         interface = p_host_interface->desc.bInterfaceNumber;
 165
 166         return interface;
 167 }
 168
 169 static int sierra_probe(struct usb_serial *serial,
 170                         const struct usb_device_id *id)
 171 {
 172         int result = 0;
 173         struct usb_device *udev;
 174         u8 ifnum;
 175
 176         udev = serial->dev;
 177         dev_dbg(&udev->dev, "%s\n", __func__);
 178
 179         ifnum = sierra_calc_interface(serial);
 180         /*
 181          * If this interface supports more than 1 alternate
 182          * select the 2nd one
 183          */
 184         if (serial->interface->num_altsetting == 2) {
 185                 dev_dbg(&udev->dev, "Selecting alt setting for interface %d\n",
 186                         ifnum);
 187                 /* We know the alternate setting is 1 for the MC8785 */
 188                 usb_set_interface(udev, ifnum, 1);
 189         }
 190
 191         /* ifnum could have changed - by calling usb_set_interface */
 192         ifnum = sierra_calc_interface(serial);
 193
 194         if (is_blacklisted(ifnum,
 195                                 (struct sierra_iface_info *)id->driver_info)) {
 196                 dev_dbg(&serial->dev->dev,
 197                         "Ignoring blacklisted interface #%d\n", ifnum);
 198                 return -ENODEV;
 199         }
 200
 201         return result;
 202 }
 203
 204 /* interfaces with higher memory requirements */
 205 static const u8 hi_memory_typeA_ifaces[] = { 0, 2 };
 206 static const struct sierra_iface_info typeA_interface_list = {
 207         .infolen = ARRAY_SIZE(hi_memory_typeA_ifaces),
 208         .ifaceinfo = hi_memory_typeA_ifaces,
 209 };
 210
 211 static const u8 hi_memory_typeB_ifaces[] = { 3, 4, 5, 6 };
 212 static const struct sierra_iface_info typeB_interface_list = {
 213         .infolen = ARRAY_SIZE(hi_memory_typeB_ifaces),
 214         .ifaceinfo = hi_memory_typeB_ifaces,
 215 };
 216
 217 /* 'blacklist' of interfaces not served by this driver */
 218 static const u8 direct_ip_non_serial_ifaces[] = { 7, 8, 9, 10, 11, 19, 20 };
 219 static const struct sierra_iface_info direct_ip_interface_blacklist = {
 220         .infolen = ARRAY_SIZE(direct_ip_non_serial_ifaces),
 221         .ifaceinfo = direct_ip_non_serial_ifaces,
 222 };
 223
 224 static const struct usb_device_id id_table[] = {
 225         { USB_DEVICE(0x0F3D, 0x0112) }, /* Airprime/Sierra PC 5220 */
 226         { USB_DEVICE(0x03F0, 0x1B1D) }, /* HP ev2200 a.k.a MC5720 */
 227         { USB_DEVICE(0x03F0, 0x211D) }, /* HP ev2210 a.k.a MC5725 */
 228         { USB_DEVICE(0x03F0, 0x1E1D) }, /* HP hs2300 a.k.a MC8775 */
 229
 230         { USB_DEVICE(0x1199, 0x0017) }, /* Sierra Wireless EM5625 */
 231         { USB_DEVICE(0x1199, 0x0018) }, /* Sierra Wireless MC5720 */
 232         { USB_DEVICE(0x1199, 0x0218) }, /* Sierra Wireless MC5720 */
 233         { USB_DEVICE(0x1199, 0x0020) }, /* Sierra Wireless MC5725 */
 234         { USB_DEVICE(0x1199, 0x0220) }, /* Sierra Wireless MC5725 */
 235         { USB_DEVICE(0x1199, 0x0022) }, /* Sierra Wireless EM5725 */
 236         { USB_DEVICE(0x1199, 0x0024) }, /* Sierra Wireless MC5727 */
 237         { USB_DEVICE(0x1199, 0x0224) }, /* Sierra Wireless MC5727 */
 238         { USB_DEVICE(0x1199, 0x0019) }, /* Sierra Wireless AirCard 595 */
 239         { USB_DEVICE(0x1199, 0x0021) }, /* Sierra Wireless AirCard 597E */
 240         { USB_DEVICE(0x1199, 0x0112) }, /* Sierra Wireless AirCard 580 */
 241         { USB_DEVICE(0x1199, 0x0120) }, /* Sierra Wireless USB Dongle 595U */
 242         { USB_DEVICE(0x1199, 0x0301) }, /* Sierra Wireless USB Dongle 250U */
 243         /* Sierra Wireless C597 */
 244         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0023, 0xFF, 0xFF, 0xFF) },
 245         /* Sierra Wireless T598 */
 246         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x0025, 0xFF, 0xFF, 0xFF) },
 247         { USB_DEVICE(0x1199, 0x0026) }, /* Sierra Wireless T11 */
 248         { USB_DEVICE(0x1199, 0x0027) }, /* Sierra Wireless AC402 */
 249         { USB_DEVICE(0x1199, 0x0028) }, /* Sierra Wireless MC5728 */
 250         { USB_DEVICE(0x1199, 0x0029) }, /* Sierra Wireless Device */
 251
 252         { USB_DEVICE(0x1199, 0x6802) }, /* Sierra Wireless MC8755 */
 253         { USB_DEVICE(0x1199, 0x6803) }, /* Sierra Wireless MC8765 */
 254         { USB_DEVICE(0x1199, 0x6804) }, /* Sierra Wireless MC8755 */
 255         { USB_DEVICE(0x1199, 0x6805) }, /* Sierra Wireless MC8765 */
 256         { USB_DEVICE(0x1199, 0x6808) }, /* Sierra Wireless MC8755 */
 257         { USB_DEVICE(0x1199, 0x6809) }, /* Sierra Wireless MC8765 */
 258         { USB_DEVICE(0x1199, 0x6812) }, /* Sierra Wireless MC8775 & AC 875U */
 259         { USB_DEVICE(0x1199, 0x6813) }, /* Sierra Wireless MC8775 */
 260         { USB_DEVICE(0x1199, 0x6815) }, /* Sierra Wireless MC8775 */
 261         { USB_DEVICE(0x1199, 0x6816) }, /* Sierra Wireless MC8775 */
 262         { USB_DEVICE(0x1199, 0x6820) }, /* Sierra Wireless AirCard 875 */
 263         { USB_DEVICE(0x1199, 0x6821) }, /* Sierra Wireless AirCard 875U */
 264         { USB_DEVICE(0x1199, 0x6822) }, /* Sierra Wireless AirCard 875E */
 265         { USB_DEVICE(0x1199, 0x6832) }, /* Sierra Wireless MC8780 */
 266         { USB_DEVICE(0x1199, 0x6833) }, /* Sierra Wireless MC8781 */
 267         { USB_DEVICE(0x1199, 0x6834) }, /* Sierra Wireless MC8780 */
 268         { USB_DEVICE(0x1199, 0x6835) }, /* Sierra Wireless MC8781 */
 269         { USB_DEVICE(0x1199, 0x6838) }, /* Sierra Wireless MC8780 */
 270         { USB_DEVICE(0x1199, 0x6839) }, /* Sierra Wireless MC8781 */
 271         { USB_DEVICE(0x1199, 0x683A) }, /* Sierra Wireless MC8785 */
 272         { USB_DEVICE(0x1199, 0x683B) }, /* Sierra Wireless MC8785 Composite */
 273         /* Sierra Wireless MC8790, MC8791, MC8792 Composite */
 274         { USB_DEVICE(0x1199, 0x683C) },
 275         { USB_DEVICE(0x1199, 0x683D) }, /* Sierra Wireless MC8791 Composite */
 276         /* Sierra Wireless MC8790, MC8791, MC8792 */
 277         { USB_DEVICE(0x1199, 0x683E) },
 278         { USB_DEVICE(0x1199, 0x6850) }, /* Sierra Wireless AirCard 880 */
 279         { USB_DEVICE(0x1199, 0x6851) }, /* Sierra Wireless AirCard 881 */
 280         { USB_DEVICE(0x1199, 0x6852) }, /* Sierra Wireless AirCard 880 E */
 281         { USB_DEVICE(0x1199, 0x6853) }, /* Sierra Wireless AirCard 881 E */
 282         { USB_DEVICE(0x1199, 0x6855) }, /* Sierra Wireless AirCard 880 U */
 283         { USB_DEVICE(0x1199, 0x6856) }, /* Sierra Wireless AirCard 881 U */
 284         { USB_DEVICE(0x1199, 0x6859) }, /* Sierra Wireless AirCard 885 E */
 285         { USB_DEVICE(0x1199, 0x685A) }, /* Sierra Wireless AirCard 885 E */
 286         /* Sierra Wireless C885 */
 287         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6880, 0xFF, 0xFF, 0xFF)},
 288         /* Sierra Wireless C888, Air Card 501, USB 303, USB 304 */
 289         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6890, 0xFF, 0xFF, 0xFF)},
 290         /* Sierra Wireless C22/C33 */
 291         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6891, 0xFF, 0xFF, 0xFF)},
 292         /* Sierra Wireless HSPA Non-Composite Device */
 293         { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x6892, 0xFF, 0xFF, 0xFF)},
 294         { USB_DEVICE(0x1199, 0x6893) }, /* Sierra Wireless Device */
 295         { USB_DEVICE(0x1199, 0x68A2),   /* Sierra Wireless MC77xx in QMI mode */
 296           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 297         },
 298         { USB_DEVICE(0x1199, 0x68A3),   /* Sierra Wireless Direct IP modems */
 299           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 300         },
 301         /* AT&T Direct IP LTE modems */
 302         { USB_DEVICE_AND_INTERFACE_INFO(0x0F3D, 0x68AA, 0xFF, 0xFF, 0xFF),
 303           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 304         },
 305         { USB_DEVICE(0x0f3d, 0x68A3),   /* Airprime/Sierra Wireless Direct IP modems */
 306           .driver_info = (kernel_ulong_t)&direct_ip_interface_blacklist
 307         },
 308        { USB_DEVICE(0x413C, 0x08133) }, /* Dell Computer Corp. Wireless 5720 VZW Mobile Broadband (EVDO Rev-A) Minicard GPS Port */
 309
 310         { }
 311 };
 312 MODULE_DEVICE_TABLE(usb, id_table);
 313
 314
 315 struct sierra_port_private {
 316         spinlock_t lock;        /* lock the structure */
 317         int outstanding_urbs;   /* number of out urbs in flight */
 318         struct usb_anchor active;
 319         struct usb_anchor delayed;
 320
 321         int num_out_urbs;
 322         int num_in_urbs;
 323         /* Input endpoints and buffers for this port */
 324         struct urb *in_urbs[N_IN_URB_HM];
 325
 326         /* Settings for the port */
 327         int rts_state;  /* Handshaking pins (outputs) */
 328         int dtr_state;
 329         int cts_state;  /* Handshaking pins (inputs) */
 330         int dsr_state;
 331         int dcd_state;
 332         int ri_state;
 333         unsigned int opened:1;
 334 };
 335
 336 static int sierra_send_setup(struct usb_serial_port *port)
 337 {
 338         struct usb_serial *serial = port->serial;
 339         struct sierra_port_private *portdata;
 340         __u16 interface = 0;
 341         int val = 0;
 342         int do_send = 0;
 343         int retval;
 344
 345         dev_dbg(&port->dev, "%s\n", __func__);
 346
 347         portdata = usb_get_serial_port_data(port);
 348
 349         if (portdata->dtr_state)
 350                 val |= 0x01;
 351         if (portdata->rts_state)
 352                 val |= 0x02;
 353
 354         /* If composite device then properly report interface */
 355         if (serial->num_ports == 1) {
 356                 interface = sierra_calc_interface(serial);
 357                 /* Control message is sent only to interfaces with
 358                  * interrupt_in endpoints
 359                  */
 360                 if (port->interrupt_in_urb) {
 361                         /* send control message */
 362                         do_send = 1;
 363                 }
 364         }
 365
 366         /* Otherwise the need to do non-composite mapping */
 367         else {
 368                 if (port->bulk_out_endpointAddress == 2)
 369                         interface = 0;
 370                 else if (port->bulk_out_endpointAddress == 4)
 371                         interface = 1;
 372                 else if (port->bulk_out_endpointAddress == 5)
 373                         interface = 2;
 374
 375                 do_send = 1;
 376         }
 377         if (!do_send)
 378                 return 0;
 379
 380         retval = usb_autopm_get_interface(serial->interface);
 381         if (retval < 0)
 382                 return retval;
 383
 384         retval = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 385                 0x22, 0x21, val, interface, NULL, 0, USB_CTRL_SET_TIMEOUT);
 386         usb_autopm_put_interface(serial->interface);
 387
 388         return retval;
 389 }
 390
 391 static void sierra_set_termios(struct tty_struct *tty,
 392                 struct usb_serial_port *port, struct ktermios *old_termios)
 393 {
 394         dev_dbg(&port->dev, "%s\n", __func__);
 395         tty_termios_copy_hw(tty->termios, old_termios);
 396         sierra_send_setup(port);
 397 }
 398
 399 static int sierra_tiocmget(struct tty_struct *tty)
 400 {
 401         struct usb_serial_port *port = tty->driver_data;
 402         unsigned int value;
 403         struct sierra_port_private *portdata;
 404
 405         dev_dbg(&port->dev, "%s\n", __func__);
 406         portdata = usb_get_serial_port_data(port);
 407
 408         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
 409                 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
 410                 ((portdata->cts_state) ? TIOCM_CTS : 0) |
 411                 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
 412                 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
 413                 ((portdata->ri_state) ? TIOCM_RNG : 0);
 414
 415         return value;
 416 }
 417
 418 static int sierra_tiocmset(struct tty_struct *tty,
 419                         unsigned int set, unsigned int clear)
 420 {
 421         struct usb_serial_port *port = tty->driver_data;
 422         struct sierra_port_private *portdata;
 423
 424         portdata = usb_get_serial_port_data(port);
 425
 426         if (set & TIOCM_RTS)
 427                 portdata->rts_state = 1;
 428         if (set & TIOCM_DTR)
 429                 portdata->dtr_state = 1;
 430
 431         if (clear & TIOCM_RTS)
 432                 portdata->rts_state = 0;
 433         if (clear & TIOCM_DTR)
 434                 portdata->dtr_state = 0;
 435         return sierra_send_setup(port);
 436 }
 437
 438 static void sierra_release_urb(struct urb *urb)
 439 {
 440         struct usb_serial_port *port;
 441         if (urb) {
 442                 port =  urb->context;
 443                 dev_dbg(&port->dev, "%s: %p\n", __func__, urb);
 444                 kfree(urb->transfer_buffer);
 445                 usb_free_urb(urb);
 446         }
 447 }
 448
 449 static void sierra_outdat_callback(struct urb *urb)
 450 {
 451         struct usb_serial_port *port = urb->context;
 452         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 453         struct sierra_intf_private *intfdata;
 454         int status = urb->status;
 455
 456         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
 457         intfdata = port->serial->private;
 458
 459         /* free up the transfer buffer, as usb_free_urb() does not do this */
 460         kfree(urb->transfer_buffer);
 461         usb_autopm_put_interface_async(port->serial->interface);
 462         if (status)
 463                 dev_dbg(&port->dev, "%s - nonzero write bulk status "
 464                     "received: %d\n", __func__, status);
 465
 466         spin_lock(&portdata->lock);
 467         --portdata->outstanding_urbs;
 468         spin_unlock(&portdata->lock);
 469         spin_lock(&intfdata->susp_lock);
 470         --intfdata->in_flight;
 471         spin_unlock(&intfdata->susp_lock);
 472
 473         usb_serial_port_softint(port);
 474 }
 475
 476 /* Write */
 477 static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
 478                                         const unsigned char *buf, int count)
 479 {
 480         struct sierra_port_private *portdata;
 481         struct sierra_intf_private *intfdata;
 482         struct usb_serial *serial = port->serial;
 483         unsigned long flags;
 484         unsigned char *buffer;
 485         struct urb *urb;
 486         size_t writesize = min((size_t)count, (size_t)MAX_TRANSFER);
 487         int retval = 0;
 488
 489         /* verify that we actually have some data to write */
 490         if (count == 0)
 491                 return 0;
 492
 493         portdata = usb_get_serial_port_data(port);
 494         intfdata = serial->private;
 495
 496         dev_dbg(&port->dev, "%s: write (%zd bytes)\n", __func__, writesize);
 497         spin_lock_irqsave(&portdata->lock, flags);
 498         dev_dbg(&port->dev, "%s - outstanding_urbs: %d\n", __func__,
 499                 portdata->outstanding_urbs);
 500         if (portdata->outstanding_urbs > portdata->num_out_urbs) {
 501                 spin_unlock_irqrestore(&portdata->lock, flags);
 502                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
 503                 return 0;
 504         }
 505         portdata->outstanding_urbs++;
 506         dev_dbg(&port->dev, "%s - 1, outstanding_urbs: %d\n", __func__,
 507                 portdata->outstanding_urbs);
 508         spin_unlock_irqrestore(&portdata->lock, flags);
 509
 510         retval = usb_autopm_get_interface_async(serial->interface);
 511         if (retval < 0) {
 512                 spin_lock_irqsave(&portdata->lock, flags);
 513                 portdata->outstanding_urbs--;
 514                 spin_unlock_irqrestore(&portdata->lock, flags);
 515                 goto error_simple;
 516         }
 517
 518         buffer = kmalloc(writesize, GFP_ATOMIC);
 519         if (!buffer) {
 520                 dev_err(&port->dev, "out of memory\n");
 521                 retval = -ENOMEM;
 522                 goto error_no_buffer;
 523         }
 524
 525         urb = usb_alloc_urb(0, GFP_ATOMIC);
 526         if (!urb) {
 527                 dev_err(&port->dev, "no more free urbs\n");
 528                 retval = -ENOMEM;
 529                 goto error_no_urb;
 530         }
 531
 532         memcpy(buffer, buf, writesize);
 533
 534         usb_serial_debug_data(debug, &port->dev, __func__, writesize, buffer);
 535
 536         usb_fill_bulk_urb(urb, serial->dev,
 537                           usb_sndbulkpipe(serial->dev,
 538                                           port->bulk_out_endpointAddress),
 539                           buffer, writesize, sierra_outdat_callback, port);
 540
 541         /* Handle the need to send a zero length packet */
 542         urb->transfer_flags |= URB_ZERO_PACKET;
 543
 544         spin_lock_irqsave(&intfdata->susp_lock, flags);
 545
 546         if (intfdata->suspended) {
 547                 usb_anchor_urb(urb, &portdata->delayed);
 548                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 549                 goto skip_power;
 550         } else {
 551                 usb_anchor_urb(urb, &portdata->active);
 552         }
 553         /* send it down the pipe */
 554         retval = usb_submit_urb(urb, GFP_ATOMIC);
 555         if (retval) {
 556                 usb_unanchor_urb(urb);
 557                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 558                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
 559                         "with status = %d\n", __func__, retval);
 560                 goto error;
 561         } else {
 562                 intfdata->in_flight++;
 563                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
 564         }
 565
 566 skip_power:
 567         /* we are done with this urb, so let the host driver
 568          * really free it when it is finished with it */
 569         usb_free_urb(urb);
 570
 571         return writesize;
 572 error:
 573         usb_free_urb(urb);
 574 error_no_urb:
 575         kfree(buffer);
 576 error_no_buffer:
 577         spin_lock_irqsave(&portdata->lock, flags);
 578         --portdata->outstanding_urbs;
 579         dev_dbg(&port->dev, "%s - 2. outstanding_urbs: %d\n", __func__,
 580                 portdata->outstanding_urbs);
 581         spin_unlock_irqrestore(&portdata->lock, flags);
 582         usb_autopm_put_interface_async(serial->interface);
 583 error_simple:
 584         return retval;
 585 }
 586
 587 static void sierra_indat_callback(struct urb *urb)
 588 {
 589         int err;
 590         int endpoint;
 591         struct usb_serial_port *port;
 592         struct tty_struct *tty;
 593         unsigned char *data = urb->transfer_buffer;
 594         int status = urb->status;
 595
 596         endpoint = usb_pipeendpoint(urb->pipe);
 597         port = urb->context;
 598
 599         dev_dbg(&port->dev, "%s: %p\n", __func__, urb);
 600
 601         if (status) {
 602                 dev_dbg(&port->dev, "%s: nonzero status: %d on"
 603                         " endpoint %02x\n", __func__, status, endpoint);
 604         } else {
 605                 if (urb->actual_length) {
 606                         tty = tty_port_tty_get(&port->port);
 607                         if (tty) {
 608                                 tty_insert_flip_string(tty, data,
 609                                         urb->actual_length);
 610                                 tty_flip_buffer_push(tty);
 611
 612                                 tty_kref_put(tty);
 613                                 usb_serial_debug_data(debug, &port->dev,
 614                                         __func__, urb->actual_length, data);
 615                         }
 616                 } else {
 617                         dev_dbg(&port->dev, "%s: empty read urb"
 618                                 " received\n", __func__);
 619                 }
 620         }
 621
 622         /* Resubmit urb so we continue receiving */
 623         if (status != -ESHUTDOWN && status != -EPERM) {
 624                 usb_mark_last_busy(port->serial->dev);
 625                 err = usb_submit_urb(urb, GFP_ATOMIC);
 626                 if (err && err != -EPERM)
 627                         dev_err(&port->dev, "resubmit read urb failed."
 628                                 "(%d)\n", err);
 629         }
 630 }
 631
 632 static void sierra_instat_callback(struct urb *urb)
 633 {
 634         int err;
 635         int status = urb->status;
 636         struct usb_serial_port *port =  urb->context;
 637         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 638         struct usb_serial *serial = port->serial;
 639
 640         dev_dbg(&port->dev, "%s: urb %p port %p has data %p\n", __func__,
 641                 urb, port, portdata);
 642
 643         if (status == 0) {
 644                 struct usb_ctrlrequest *req_pkt =
 645                                 (struct usb_ctrlrequest *)urb->transfer_buffer;
 646
 647                 if (!req_pkt) {
 648                         dev_dbg(&port->dev, "%s: NULL req_pkt\n",
 649                                 __func__);
 650                         return;
 651                 }
 652                 if ((req_pkt->bRequestType == 0xA1) &&
 653                                 (req_pkt->bRequest == 0x20)) {
 654                         int old_dcd_state;
 655                         unsigned char signals = *((unsigned char *)
 656                                         urb->transfer_buffer +
 657                                         sizeof(struct usb_ctrlrequest));
 658                         struct tty_struct *tty;
 659
 660                         dev_dbg(&port->dev, "%s: signal x%x\n", __func__,
 661                                 signals);
 662
 663                         old_dcd_state = portdata->dcd_state;
 664                         portdata->cts_state = 1;
 665                         portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
 666                         portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
 667                         portdata->ri_state = ((signals & 0x08) ? 1 : 0);
 668
 669                         tty = tty_port_tty_get(&port->port);
 670                         if (tty && !C_CLOCAL(tty) &&
 671                                         old_dcd_state && !portdata->dcd_state)
 672                                 tty_hangup(tty);
 673                         tty_kref_put(tty);
 674                 } else {
 675                         dev_dbg(&port->dev, "%s: type %x req %x\n",
 676                                 __func__, req_pkt->bRequestType,
 677                                 req_pkt->bRequest);
 678                 }
 679         } else
 680                 dev_dbg(&port->dev, "%s: error %d\n", __func__, status);
 681
 682         /* Resubmit urb so we continue receiving IRQ data */
 683         if (status != -ESHUTDOWN && status != -ENOENT) {
 684                 usb_mark_last_busy(serial->dev);
 685                 urb->dev = serial->dev;
 686                 err = usb_submit_urb(urb, GFP_ATOMIC);
 687                 if (err && err != -EPERM)
 688                         dev_err(&port->dev, "%s: resubmit intr urb "
 689                                 "failed. (%d)\n", __func__, err);
 690         }
 691 }
 692
 693 static int sierra_write_room(struct tty_struct *tty)
 694 {
 695         struct usb_serial_port *port = tty->driver_data;
 696         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 697         unsigned long flags;
 698
 699         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
 700
 701         /* try to give a good number back based on if we have any free urbs at
 702          * this point in time */
 703         spin_lock_irqsave(&portdata->lock, flags);
 704         if (portdata->outstanding_urbs > (portdata->num_out_urbs * 2) / 3) {
 705                 spin_unlock_irqrestore(&portdata->lock, flags);
 706                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
 707                 return 0;
 708         }
 709         spin_unlock_irqrestore(&portdata->lock, flags);
 710
 711         return 2048;
 712 }
 713
 714 static void sierra_stop_rx_urbs(struct usb_serial_port *port)
 715 {
 716         int i;
 717         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 718
 719         for (i = 0; i < portdata->num_in_urbs; i++)
 720                 usb_kill_urb(portdata->in_urbs[i]);
 721
 722         usb_kill_urb(port->interrupt_in_urb);
 723 }
 724
 725 static int sierra_submit_rx_urbs(struct usb_serial_port *port, gfp_t mem_flags)
 726 {
 727         int ok_cnt;
 728         int err = -EINVAL;
 729         int i;
 730         struct urb *urb;
 731         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
 732
 733         ok_cnt = 0;
 734         for (i = 0; i < portdata->num_in_urbs; i++) {
 735                 urb = portdata->in_urbs[i];
 736                 if (!urb)
 737                         continue;
 738                 err = usb_submit_urb(urb, mem_flags);
 739                 if (err) {
 740                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
 741                                 __func__, err);
 742                 } else {
 743                         ok_cnt++;
 744                 }
 745         }
 746
 747         if (ok_cnt && port->interrupt_in_urb) {
 748                 err = usb_submit_urb(port->interrupt_in_urb, mem_flags);
 749                 if (err) {
 750                         dev_err(&port->dev, "%s: submit intr urb failed: %d\n",
 751                                 __func__, err);
 752                 }
 753         }
 754
 755         if (ok_cnt > 0) /* at least one rx urb submitted */
 756                 return 0;
 757         else
 758                 return err;
 759 }
 760
 761 static struct urb *sierra_setup_urb(struct usb_serial *serial, int endpoint,
 762                                         int dir, void *ctx, int len,
 763                                         gfp_t mem_flags,
 764                                         usb_complete_t callback)
 765 {
 766         struct urb      *urb;
 767         u8              *buf;
 768
 769         if (endpoint == -1)
 770                 return NULL;
 771
 772         urb = usb_alloc_urb(0, mem_flags);
 773         if (urb == NULL) {
 774                 dev_dbg(&serial->dev->dev, "%s: alloc for endpoint %d failed\n",
 775                         __func__, endpoint);
 776                 return NULL;
 777         }
 778
 779         buf = kmalloc(len, mem_flags);
 780         if (buf) {
 781                 /* Fill URB using supplied data */
 782                 usb_fill_bulk_urb(urb, serial->dev,
 783                         usb_sndbulkpipe(serial->dev, endpoint) | dir,
 784                         buf, len, callback, ctx);
 785
 786                 /* debug */
 787                 dev_dbg(&serial->dev->dev, "%s %c u : %p d:%p\n", __func__,
 788                                 dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
 789         } else {
 790                 dev_dbg(&serial->dev->dev, "%s %c u:%p d:%p\n", __func__,
 791                                 dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
 792
 793                 sierra_release_urb(urb);
 794                 urb = NULL;
 795         }
 796
 797         return urb;
 798 }
 799
 800 static void sierra_close(struct usb_serial_port *port)
 801 {
 802         int i;
 803         struct usb_serial *serial = port->serial;
 804         struct sierra_port_private *portdata;
 805         struct sierra_intf_private *intfdata = port->serial->private;
 806
 807
 808         dev_dbg(&port->dev, "%s\n", __func__);
 809         portdata = usb_get_serial_port_data(port);
 810
 811         portdata->rts_state = 0;
 812         portdata->dtr_state = 0;
 813
 814         if (serial->dev) {
 815                 mutex_lock(&serial->disc_mutex);
 816                 if (!serial->disconnected) {
 817                         serial->interface->needs_remote_wakeup = 0;
 818                         /* odd error handling due to pm counters */
 819                         if (!usb_autopm_get_interface(serial->interface))
 820                                 sierra_send_setup(port);
 821                         else
 822                                 usb_autopm_get_interface_no_resume(serial->interface);
 823
 824                 }
 825                 mutex_unlock(&serial->disc_mutex);
 826                 spin_lock_irq(&intfdata->susp_lock);
 827                 portdata->opened = 0;
 828                 spin_unlock_irq(&intfdata->susp_lock);
 829
 830
 831                 /* Stop reading urbs */
 832                 sierra_stop_rx_urbs(port);
 833                 /* .. and release them */
 834                 for (i = 0; i < portdata->num_in_urbs; i++) {
 835                         sierra_release_urb(portdata->in_urbs[i]);
 836                         portdata->in_urbs[i] = NULL;
 837                 }
 838         }
 839 }
 840
 841 static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
 842 {
 843         struct sierra_port_private *portdata;
 844         struct usb_serial *serial = port->serial;
 845         struct sierra_intf_private *intfdata = serial->private;
 846         int i;
 847         int err;
 848         int endpoint;
 849         struct urb *urb;
 850
 851         portdata = usb_get_serial_port_data(port);
 852
 853         dev_dbg(&port->dev, "%s\n", __func__);
 854
 855         /* Set some sane defaults */
 856         portdata->rts_state = 1;
 857         portdata->dtr_state = 1;
 858
 859
 860         endpoint = port->bulk_in_endpointAddress;
 861         for (i = 0; i < portdata->num_in_urbs; i++) {
 862                 urb = sierra_setup_urb(serial, endpoint, USB_DIR_IN, port,
 863                                         IN_BUFLEN, GFP_KERNEL,
 864                                         sierra_indat_callback);
 865                 portdata->in_urbs[i] = urb;
 866         }
 867         /* clear halt condition */
 868         usb_clear_halt(serial->dev,
 869                         usb_sndbulkpipe(serial->dev, endpoint) | USB_DIR_IN);
 870
 871         err = sierra_submit_rx_urbs(port, GFP_KERNEL);
 872         if (err) {
 873                 /* get rid of everything as in close */
 874                 sierra_close(port);
 875                 /* restore balance for autopm */
 876                 if (!serial->disconnected)
 877                         usb_autopm_put_interface(serial->interface);
 878                 return err;
 879         }
 880         sierra_send_setup(port);
 881
 882         serial->interface->needs_remote_wakeup = 1;
 883         spin_lock_irq(&intfdata->susp_lock);
 884         portdata->opened = 1;
 885         spin_unlock_irq(&intfdata->susp_lock);
 886         usb_autopm_put_interface(serial->interface);
 887
 888         return 0;
 889 }
 890
 891
 892 static void sierra_dtr_rts(struct usb_serial_port *port, int on)
 893 {
 894         struct usb_serial *serial = port->serial;
 895         struct sierra_port_private *portdata;
 896
 897         portdata = usb_get_serial_port_data(port);
 898         portdata->rts_state = on;
 899         portdata->dtr_state = on;
 900
 901         if (serial->dev) {
 902                 mutex_lock(&serial->disc_mutex);
 903                 if (!serial->disconnected)
 904                         sierra_send_setup(port);
 905                 mutex_unlock(&serial->disc_mutex);
 906         }
 907 }
 908
 909 static int sierra_startup(struct usb_serial *serial)
 910 {
 911         struct usb_serial_port *port;
 912         struct sierra_intf_private *intfdata;
 913         struct sierra_port_private *portdata;
 914         struct sierra_iface_info *himemoryp = NULL;
 915         int i;
 916         u8 ifnum;
 917
 918         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 919
 920         intfdata = kzalloc(sizeof(*intfdata), GFP_KERNEL);
 921         if (!intfdata)
 922                 return -ENOMEM;
 923
 924         spin_lock_init(&intfdata->susp_lock);
 925
 926         usb_set_serial_data(serial, intfdata);
 927
 928         /* Set Device mode to D0 */
 929         sierra_set_power_state(serial->dev, 0x0000);
 930
 931         /* Check NMEA and set */
 932         if (nmea)
 933                 sierra_vsc_set_nmea(serial->dev, 1);
 934
 935         /* Now setup per port private data */
 936         for (i = 0; i < serial->num_ports; i++) {
 937                 port = serial->port[i];
 938                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
 939                 if (!portdata) {
 940                         dev_dbg(&port->dev, "%s: kmalloc for "
 941                                 "sierra_port_private (%d) failed!\n",
 942                                 __func__, i);
 943                         goto err;
 944                 }
 945                 spin_lock_init(&portdata->lock);
 946                 init_usb_anchor(&portdata->active);
 947                 init_usb_anchor(&portdata->delayed);
 948                 ifnum = i;
 949                 /* Assume low memory requirements */
 950                 portdata->num_out_urbs = N_OUT_URB;
 951                 portdata->num_in_urbs  = N_IN_URB;
 952
 953                 /* Determine actual memory requirements */
 954                 if (serial->num_ports == 1) {
 955                         /* Get interface number for composite device */
 956                         ifnum = sierra_calc_interface(serial);
 957                         himemoryp =
 958                             (struct sierra_iface_info *)&typeB_interface_list;
 959                         if (is_himemory(ifnum, himemoryp)) {
 960                                 portdata->num_out_urbs = N_OUT_URB_HM;
 961                                 portdata->num_in_urbs  = N_IN_URB_HM;
 962                         }
 963                 }
 964                 else {
 965                         himemoryp =
 966                             (struct sierra_iface_info *)&typeA_interface_list;
 967                         if (is_himemory(i, himemoryp)) {
 968                                 portdata->num_out_urbs = N_OUT_URB_HM;
 969                                 portdata->num_in_urbs  = N_IN_URB_HM;
 970                         }
 971                 }
 972                 dev_dbg(&serial->dev->dev,
 973                         "Memory usage (urbs) interface #%d, in=%d, out=%d\n",
 974                         ifnum,portdata->num_in_urbs, portdata->num_out_urbs );
 975                 /* Set the port private data pointer */
 976                 usb_set_serial_port_data(port, portdata);
 977         }
 978
 979         return 0;
 980 err:
 981         for (--i; i >= 0; --i) {
 982                 portdata = usb_get_serial_port_data(serial->port[i]);
 983                 kfree(portdata);
 984         }
 985         kfree(intfdata);
 986
 987         return -ENOMEM;
 988 }
 989
 990 static void sierra_release(struct usb_serial *serial)
 991 {
 992         int i;
 993         struct usb_serial_port *port;
 994         struct sierra_port_private *portdata;
 995
 996         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 997
 998         for (i = 0; i < serial->num_ports; ++i) {
 999                 port = serial->port[i];
1000                 if (!port)
1001                         continue;
1002                 portdata = usb_get_serial_port_data(port);
1003                 if (!portdata)
1004                         continue;
1005                 kfree(portdata);
1006         }
1007         kfree(serial->private);
1008 }
1009
1010 #ifdef CONFIG_PM
1011 static void stop_read_write_urbs(struct usb_serial *serial)
1012 {
1013         int i;
1014         struct usb_serial_port *port;
1015         struct sierra_port_private *portdata;
1016
1017         /* Stop reading/writing urbs */
1018         for (i = 0; i < serial->num_ports; ++i) {
1019                 port = serial->port[i];
1020                 portdata = usb_get_serial_port_data(port);
1021                 sierra_stop_rx_urbs(port);
1022                 usb_kill_anchored_urbs(&portdata->active);
1023         }
1024 }
1025
1026 static int sierra_suspend(struct usb_serial *serial, pm_message_t message)
1027 {
1028         struct sierra_intf_private *intfdata;
1029         int b;
1030
1031         if (PMSG_IS_AUTO(message)) {
1032                 intfdata = serial->private;
1033                 spin_lock_irq(&intfdata->susp_lock);
1034                 b = intfdata->in_flight;
1035
1036                 if (b) {
1037                         spin_unlock_irq(&intfdata->susp_lock);
1038                         return -EBUSY;
1039                 } else {
1040                         intfdata->suspended = 1;
1041                         spin_unlock_irq(&intfdata->susp_lock);
1042                 }
1043         }
1044         stop_read_write_urbs(serial);
1045
1046         return 0;
1047 }
1048
1049 static int sierra_resume(struct usb_serial *serial)
1050 {
1051         struct usb_serial_port *port;
1052         struct sierra_intf_private *intfdata = serial->private;
1053         struct sierra_port_private *portdata;
1054         struct urb *urb;
1055         int ec = 0;
1056         int i, err;
1057
1058         spin_lock_irq(&intfdata->susp_lock);
1059         for (i = 0; i < serial->num_ports; i++) {
1060                 port = serial->port[i];
1061                 portdata = usb_get_serial_port_data(port);
1062
1063                 while ((urb = usb_get_from_anchor(&portdata->delayed))) {
1064                         usb_anchor_urb(urb, &portdata->active);
1065                         intfdata->in_flight++;
1066                         err = usb_submit_urb(urb, GFP_ATOMIC);
1067                         if (err < 0) {
1068                                 intfdata->in_flight--;
1069                                 usb_unanchor_urb(urb);
1070                                 usb_scuttle_anchored_urbs(&portdata->delayed);
1071                                 break;
1072                         }
1073                 }
1074
1075                 if (portdata->opened) {
1076                         err = sierra_submit_rx_urbs(port, GFP_ATOMIC);
1077                         if (err)
1078                                 ec++;
1079                 }
1080         }
1081         intfdata->suspended = 0;
1082         spin_unlock_irq(&intfdata->susp_lock);
1083
1084         return ec ? -EIO : 0;
1085 }
1086
1087 static int sierra_reset_resume(struct usb_interface *intf)
1088 {
1089         struct usb_serial *serial = usb_get_intfdata(intf);
1090         dev_err(&serial->dev->dev, "%s\n", __func__);
1091         return usb_serial_resume(intf);
1092 }
1093 #else
1094 #define sierra_suspend NULL
1095 #define sierra_resume NULL
1096 #define sierra_reset_resume NULL
1097 #endif
1098
1099 static struct usb_driver sierra_driver = {
1100         .name       = "sierra",
1101         .probe      = usb_serial_probe,
1102         .disconnect = usb_serial_disconnect,
1103         .suspend    = usb_serial_suspend,
1104         .resume     = usb_serial_resume,
1105         .reset_resume = sierra_reset_resume,
1106         .id_table   = id_table,
1107         .no_dynamic_id =        1,
1108         .supports_autosuspend = 1,
1109 };
1110
1111 static struct usb_serial_driver sierra_device = {
1112         .driver = {
1113                 .owner =        THIS_MODULE,
1114                 .name =         "sierra",
1115         },
1116         .description       = "Sierra USB modem",
1117         .id_table          = id_table,
1118         .usb_driver        = &sierra_driver,
1119         .calc_num_ports    = sierra_calc_num_ports,
1120         .probe             = sierra_probe,
1121         .open              = sierra_open,
1122         .close             = sierra_close,
1123         .dtr_rts           = sierra_dtr_rts,
1124         .write             = sierra_write,
1125         .write_room        = sierra_write_room,
1126         .set_termios       = sierra_set_termios,
1127         .tiocmget          = sierra_tiocmget,
1128         .tiocmset          = sierra_tiocmset,
1129         .attach            = sierra_startup,
1130         .release           = sierra_release,
1131         .suspend           = sierra_suspend,
1132         .resume            = sierra_resume,
1133         .read_int_callback = sierra_instat_callback,
1134 };
1135
1136 /* Functions used by new usb-serial code. */
1137 static int __init sierra_init(void)
1138 {
1139         int retval;
1140         retval = usb_serial_register(&sierra_device);
1141         if (retval)
1142                 goto failed_device_register;
1143
1144
1145         retval = usb_register(&sierra_driver);
1146         if (retval)
1147                 goto failed_driver_register;
1148
1149         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1150                DRIVER_DESC "\n");
1151
1152         return 0;
1153
1154 failed_driver_register:
1155         usb_serial_deregister(&sierra_device);
1156 failed_device_register:
1157         return retval;
1158 }
1159
1160 static void __exit sierra_exit(void)
1161 {
1162         usb_deregister(&sierra_driver);
1163         usb_serial_deregister(&sierra_device);
1164 }
1165
1166 module_init(sierra_init);
1167 module_exit(sierra_exit);
1168
1169 MODULE_AUTHOR(DRIVER_AUTHOR);
1170 MODULE_DESCRIPTION(DRIVER_DESC);
1171 MODULE_VERSION(DRIVER_VERSION);
1172 MODULE_LICENSE("GPL");
1173
1174 module_param(nmea, bool, S_IRUGO | S_IWUSR);
1175 MODULE_PARM_DESC(nmea, "NMEA streaming");
1176
1177 module_param(debug, bool, S_IRUGO | S_IWUSR);
1178 MODULE_PARM_DESC(debug, "Debug messages");