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