Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/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        { USB_DEVICE(0x413C, 0x08133) }, /* Dell Computer Corp. Wireless 5720 VZW Mobile Broadband (EVDO Rev-A) Minicard GPS Port */
295 
296         { }
297 };
298 MODULE_DEVICE_TABLE(usb, id_table);
299 
300 
301 struct sierra_port_private {
302         spinlock_t lock;        /* lock the structure */
303         int outstanding_urbs;   /* number of out urbs in flight */
304         struct usb_anchor active;
305         struct usb_anchor delayed;
306 
307         int num_out_urbs;
308         int num_in_urbs;
309         /* Input endpoints and buffers for this port */
310         struct urb *in_urbs[N_IN_URB_HM];
311 
312         /* Settings for the port */
313         int rts_state;  /* Handshaking pins (outputs) */
314         int dtr_state;
315         int cts_state;  /* Handshaking pins (inputs) */
316         int dsr_state;
317         int dcd_state;
318         int ri_state;
319         unsigned int opened:1;
320 };
321 
322 static int sierra_send_setup(struct usb_serial_port *port)
323 {
324         struct usb_serial *serial = port->serial;
325         struct sierra_port_private *portdata;
326         __u16 interface = 0;
327         int val = 0;
328         int do_send = 0;
329         int retval;
330 
331         portdata = usb_get_serial_port_data(port);
332 
333         if (portdata->dtr_state)
334                 val |= 0x01;
335         if (portdata->rts_state)
336                 val |= 0x02;
337 
338         /* If composite device then properly report interface */
339         if (serial->num_ports == 1) {
340                 interface = sierra_calc_interface(serial);
341                 /* Control message is sent only to interfaces with
342                  * interrupt_in endpoints
343                  */
344                 if (port->interrupt_in_urb) {
345                         /* send control message */
346                         do_send = 1;
347                 }
348         }
349 
350         /* Otherwise the need to do non-composite mapping */
351         else {
352                 if (port->bulk_out_endpointAddress == 2)
353                         interface = 0;
354                 else if (port->bulk_out_endpointAddress == 4)
355                         interface = 1;
356                 else if (port->bulk_out_endpointAddress == 5)
357                         interface = 2;
358 
359                 do_send = 1;
360         }
361         if (!do_send)
362                 return 0;
363 
364         retval = usb_autopm_get_interface(serial->interface);
365         if (retval < 0)
366                 return retval;
367 
368         retval = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
369                 0x22, 0x21, val, interface, NULL, 0, USB_CTRL_SET_TIMEOUT);
370         usb_autopm_put_interface(serial->interface);
371 
372         return retval;
373 }
374 
375 static void sierra_set_termios(struct tty_struct *tty,
376                 struct usb_serial_port *port, struct ktermios *old_termios)
377 {
378         tty_termios_copy_hw(&tty->termios, old_termios);
379         sierra_send_setup(port);
380 }
381 
382 static int sierra_tiocmget(struct tty_struct *tty)
383 {
384         struct usb_serial_port *port = tty->driver_data;
385         unsigned int value;
386         struct sierra_port_private *portdata;
387 
388         portdata = usb_get_serial_port_data(port);
389 
390         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
391                 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
392                 ((portdata->cts_state) ? TIOCM_CTS : 0) |
393                 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
394                 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
395                 ((portdata->ri_state) ? TIOCM_RNG : 0);
396 
397         return value;
398 }
399 
400 static int sierra_tiocmset(struct tty_struct *tty,
401                         unsigned int set, unsigned int clear)
402 {
403         struct usb_serial_port *port = tty->driver_data;
404         struct sierra_port_private *portdata;
405 
406         portdata = usb_get_serial_port_data(port);
407 
408         if (set & TIOCM_RTS)
409                 portdata->rts_state = 1;
410         if (set & TIOCM_DTR)
411                 portdata->dtr_state = 1;
412 
413         if (clear & TIOCM_RTS)
414                 portdata->rts_state = 0;
415         if (clear & TIOCM_DTR)
416                 portdata->dtr_state = 0;
417         return sierra_send_setup(port);
418 }
419 
420 static void sierra_release_urb(struct urb *urb)
421 {
422         struct usb_serial_port *port;
423         if (urb) {
424                 port = urb->context;
425                 kfree(urb->transfer_buffer);
426                 usb_free_urb(urb);
427         }
428 }
429 
430 static void sierra_outdat_callback(struct urb *urb)
431 {
432         struct usb_serial_port *port = urb->context;
433         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
434         struct sierra_intf_private *intfdata;
435         int status = urb->status;
436 
437         intfdata = port->serial->private;
438 
439         /* free up the transfer buffer, as usb_free_urb() does not do this */
440         kfree(urb->transfer_buffer);
441         usb_autopm_put_interface_async(port->serial->interface);
442         if (status)
443                 dev_dbg(&port->dev, "%s - nonzero write bulk status "
444                     "received: %d\n", __func__, status);
445 
446         spin_lock(&portdata->lock);
447         --portdata->outstanding_urbs;
448         spin_unlock(&portdata->lock);
449         spin_lock(&intfdata->susp_lock);
450         --intfdata->in_flight;
451         spin_unlock(&intfdata->susp_lock);
452 
453         usb_serial_port_softint(port);
454 }
455 
456 /* Write */
457 static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
458                                         const unsigned char *buf, int count)
459 {
460         struct sierra_port_private *portdata;
461         struct sierra_intf_private *intfdata;
462         struct usb_serial *serial = port->serial;
463         unsigned long flags;
464         unsigned char *buffer;
465         struct urb *urb;
466         size_t writesize = min((size_t)count, (size_t)MAX_TRANSFER);
467         int retval = 0;
468 
469         /* verify that we actually have some data to write */
470         if (count == 0)
471                 return 0;
472 
473         portdata = usb_get_serial_port_data(port);
474         intfdata = serial->private;
475 
476         dev_dbg(&port->dev, "%s: write (%zd bytes)\n", __func__, writesize);
477         spin_lock_irqsave(&portdata->lock, flags);
478         dev_dbg(&port->dev, "%s - outstanding_urbs: %d\n", __func__,
479                 portdata->outstanding_urbs);
480         if (portdata->outstanding_urbs > portdata->num_out_urbs) {
481                 spin_unlock_irqrestore(&portdata->lock, flags);
482                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
483                 return 0;
484         }
485         portdata->outstanding_urbs++;
486         dev_dbg(&port->dev, "%s - 1, outstanding_urbs: %d\n", __func__,
487                 portdata->outstanding_urbs);
488         spin_unlock_irqrestore(&portdata->lock, flags);
489 
490         retval = usb_autopm_get_interface_async(serial->interface);
491         if (retval < 0) {
492                 spin_lock_irqsave(&portdata->lock, flags);
493                 portdata->outstanding_urbs--;
494                 spin_unlock_irqrestore(&portdata->lock, flags);
495                 goto error_simple;
496         }
497 
498         buffer = kmalloc(writesize, GFP_ATOMIC);
499         if (!buffer) {
500                 retval = -ENOMEM;
501                 goto error_no_buffer;
502         }
503 
504         urb = usb_alloc_urb(0, GFP_ATOMIC);
505         if (!urb) {
506                 retval = -ENOMEM;
507                 goto error_no_urb;
508         }
509 
510         memcpy(buffer, buf, writesize);
511 
512         usb_serial_debug_data(&port->dev, __func__, writesize, buffer);
513 
514         usb_fill_bulk_urb(urb, serial->dev,
515                           usb_sndbulkpipe(serial->dev,
516                                           port->bulk_out_endpointAddress),
517                           buffer, writesize, sierra_outdat_callback, port);
518 
519         /* Handle the need to send a zero length packet */
520         urb->transfer_flags |= URB_ZERO_PACKET;
521 
522         spin_lock_irqsave(&intfdata->susp_lock, flags);
523 
524         if (intfdata->suspended) {
525                 usb_anchor_urb(urb, &portdata->delayed);
526                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
527                 goto skip_power;
528         } else {
529                 usb_anchor_urb(urb, &portdata->active);
530         }
531         /* send it down the pipe */
532         retval = usb_submit_urb(urb, GFP_ATOMIC);
533         if (retval) {
534                 usb_unanchor_urb(urb);
535                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
536                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
537                         "with status = %d\n", __func__, retval);
538                 goto error;
539         } else {
540                 intfdata->in_flight++;
541                 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
542         }
543 
544 skip_power:
545         /* we are done with this urb, so let the host driver
546          * really free it when it is finished with it */
547         usb_free_urb(urb);
548 
549         return writesize;
550 error:
551         usb_free_urb(urb);
552 error_no_urb:
553         kfree(buffer);
554 error_no_buffer:
555         spin_lock_irqsave(&portdata->lock, flags);
556         --portdata->outstanding_urbs;
557         dev_dbg(&port->dev, "%s - 2. outstanding_urbs: %d\n", __func__,
558                 portdata->outstanding_urbs);
559         spin_unlock_irqrestore(&portdata->lock, flags);
560         usb_autopm_put_interface_async(serial->interface);
561 error_simple:
562         return retval;
563 }
564 
565 static void sierra_indat_callback(struct urb *urb)
566 {
567         int err;
568         int endpoint;
569         struct usb_serial_port *port;
570         unsigned char *data = urb->transfer_buffer;
571         int status = urb->status;
572 
573         endpoint = usb_pipeendpoint(urb->pipe);
574         port = urb->context;
575 
576         if (status) {
577                 dev_dbg(&port->dev, "%s: nonzero status: %d on"
578                         " endpoint %02x\n", __func__, status, endpoint);
579         } else {
580                 if (urb->actual_length) {
581                         tty_insert_flip_string(&port->port, data,
582                                 urb->actual_length);
583                         tty_flip_buffer_push(&port->port);
584 
585                         usb_serial_debug_data(&port->dev, __func__,
586                                               urb->actual_length, data);
587                 } else {
588                         dev_dbg(&port->dev, "%s: empty read urb"
589                                 " received\n", __func__);
590                 }
591         }
592 
593         /* Resubmit urb so we continue receiving */
594         if (status != -ESHUTDOWN && status != -EPERM) {
595                 usb_mark_last_busy(port->serial->dev);
596                 err = usb_submit_urb(urb, GFP_ATOMIC);
597                 if (err && err != -EPERM)
598                         dev_err(&port->dev, "resubmit read urb failed."
599                                 "(%d)\n", err);
600         }
601 }
602 
603 static void sierra_instat_callback(struct urb *urb)
604 {
605         int err;
606         int status = urb->status;
607         struct usb_serial_port *port =  urb->context;
608         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
609         struct usb_serial *serial = port->serial;
610 
611         dev_dbg(&port->dev, "%s: urb %p port %p has data %p\n", __func__,
612                 urb, port, portdata);
613 
614         if (status == 0) {
615                 struct usb_ctrlrequest *req_pkt =
616                                 (struct usb_ctrlrequest *)urb->transfer_buffer;
617 
618                 if (!req_pkt) {
619                         dev_dbg(&port->dev, "%s: NULL req_pkt\n",
620                                 __func__);
621                         return;
622                 }
623                 if ((req_pkt->bRequestType == 0xA1) &&
624                                 (req_pkt->bRequest == 0x20)) {
625                         int old_dcd_state;
626                         unsigned char signals = *((unsigned char *)
627                                         urb->transfer_buffer +
628                                         sizeof(struct usb_ctrlrequest));
629 
630                         dev_dbg(&port->dev, "%s: signal x%x\n", __func__,
631                                 signals);
632 
633                         old_dcd_state = portdata->dcd_state;
634                         portdata->cts_state = 1;
635                         portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
636                         portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
637                         portdata->ri_state = ((signals & 0x08) ? 1 : 0);
638 
639                         if (old_dcd_state && !portdata->dcd_state)
640                                 tty_port_tty_hangup(&port->port, true);
641                 } else {
642                         dev_dbg(&port->dev, "%s: type %x req %x\n",
643                                 __func__, req_pkt->bRequestType,
644                                 req_pkt->bRequest);
645                 }
646         } else
647                 dev_dbg(&port->dev, "%s: error %d\n", __func__, status);
648 
649         /* Resubmit urb so we continue receiving IRQ data */
650         if (status != -ESHUTDOWN && status != -ENOENT) {
651                 usb_mark_last_busy(serial->dev);
652                 err = usb_submit_urb(urb, GFP_ATOMIC);
653                 if (err && err != -EPERM)
654                         dev_err(&port->dev, "%s: resubmit intr urb "
655                                 "failed. (%d)\n", __func__, err);
656         }
657 }
658 
659 static int sierra_write_room(struct tty_struct *tty)
660 {
661         struct usb_serial_port *port = tty->driver_data;
662         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
663         unsigned long flags;
664 
665         /* try to give a good number back based on if we have any free urbs at
666          * this point in time */
667         spin_lock_irqsave(&portdata->lock, flags);
668         if (portdata->outstanding_urbs > (portdata->num_out_urbs * 2) / 3) {
669                 spin_unlock_irqrestore(&portdata->lock, flags);
670                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
671                 return 0;
672         }
673         spin_unlock_irqrestore(&portdata->lock, flags);
674 
675         return 2048;
676 }
677 
678 static void sierra_stop_rx_urbs(struct usb_serial_port *port)
679 {
680         int i;
681         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
682 
683         for (i = 0; i < portdata->num_in_urbs; i++)
684                 usb_kill_urb(portdata->in_urbs[i]);
685 
686         usb_kill_urb(port->interrupt_in_urb);
687 }
688 
689 static int sierra_submit_rx_urbs(struct usb_serial_port *port, gfp_t mem_flags)
690 {
691         int ok_cnt;
692         int err = -EINVAL;
693         int i;
694         struct urb *urb;
695         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
696 
697         ok_cnt = 0;
698         for (i = 0; i < portdata->num_in_urbs; i++) {
699                 urb = portdata->in_urbs[i];
700                 if (!urb)
701                         continue;
702                 err = usb_submit_urb(urb, mem_flags);
703                 if (err) {
704                         dev_err(&port->dev, "%s: submit urb failed: %d\n",
705                                 __func__, err);
706                 } else {
707                         ok_cnt++;
708                 }
709         }
710 
711         if (ok_cnt && port->interrupt_in_urb) {
712                 err = usb_submit_urb(port->interrupt_in_urb, mem_flags);
713                 if (err) {
714                         dev_err(&port->dev, "%s: submit intr urb failed: %d\n",
715                                 __func__, err);
716                 }
717         }
718 
719         if (ok_cnt > 0) /* at least one rx urb submitted */
720                 return 0;
721         else
722                 return err;
723 }
724 
725 static struct urb *sierra_setup_urb(struct usb_serial *serial, int endpoint,
726                                         int dir, void *ctx, int len,
727                                         gfp_t mem_flags,
728                                         usb_complete_t callback)
729 {
730         struct urb      *urb;
731         u8              *buf;
732 
733         if (endpoint == -1)
734                 return NULL;
735 
736         urb = usb_alloc_urb(0, mem_flags);
737         if (!urb)
738                 return NULL;
739 
740         buf = kmalloc(len, mem_flags);
741         if (buf) {
742                 /* Fill URB using supplied data */
743                 usb_fill_bulk_urb(urb, serial->dev,
744                         usb_sndbulkpipe(serial->dev, endpoint) | dir,
745                         buf, len, callback, ctx);
746 
747                 dev_dbg(&serial->dev->dev, "%s %c u : %p d:%p\n", __func__,
748                                 dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
749         } else {
750                 sierra_release_urb(urb);
751                 urb = NULL;
752         }
753 
754         return urb;
755 }
756 
757 static void sierra_close(struct usb_serial_port *port)
758 {
759         int i;
760         struct usb_serial *serial = port->serial;
761         struct sierra_port_private *portdata;
762         struct sierra_intf_private *intfdata = port->serial->private;
763 
764         portdata = usb_get_serial_port_data(port);
765 
766         portdata->rts_state = 0;
767         portdata->dtr_state = 0;
768 
769         mutex_lock(&serial->disc_mutex);
770         if (!serial->disconnected) {
771                 serial->interface->needs_remote_wakeup = 0;
772                 /* odd error handling due to pm counters */
773                 if (!usb_autopm_get_interface(serial->interface))
774                         sierra_send_setup(port);
775                 else
776                         usb_autopm_get_interface_no_resume(serial->interface);
777 
778         }
779         mutex_unlock(&serial->disc_mutex);
780         spin_lock_irq(&intfdata->susp_lock);
781         portdata->opened = 0;
782         spin_unlock_irq(&intfdata->susp_lock);
783 
784         sierra_stop_rx_urbs(port);
785         for (i = 0; i < portdata->num_in_urbs; i++) {
786                 sierra_release_urb(portdata->in_urbs[i]);
787                 portdata->in_urbs[i] = NULL;
788         }
789 }
790 
791 static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
792 {
793         struct sierra_port_private *portdata;
794         struct usb_serial *serial = port->serial;
795         struct sierra_intf_private *intfdata = serial->private;
796         int i;
797         int err;
798         int endpoint;
799         struct urb *urb;
800 
801         portdata = usb_get_serial_port_data(port);
802 
803         /* Set some sane defaults */
804         portdata->rts_state = 1;
805         portdata->dtr_state = 1;
806 
807 
808         endpoint = port->bulk_in_endpointAddress;
809         for (i = 0; i < portdata->num_in_urbs; i++) {
810                 urb = sierra_setup_urb(serial, endpoint, USB_DIR_IN, port,
811                                         IN_BUFLEN, GFP_KERNEL,
812                                         sierra_indat_callback);
813                 portdata->in_urbs[i] = urb;
814         }
815         /* clear halt condition */
816         usb_clear_halt(serial->dev,
817                         usb_sndbulkpipe(serial->dev, endpoint) | USB_DIR_IN);
818 
819         err = sierra_submit_rx_urbs(port, GFP_KERNEL);
820         if (err) {
821                 /* get rid of everything as in close */
822                 sierra_close(port);
823                 /* restore balance for autopm */
824                 if (!serial->disconnected)
825                         usb_autopm_put_interface(serial->interface);
826                 return err;
827         }
828         sierra_send_setup(port);
829 
830         serial->interface->needs_remote_wakeup = 1;
831         spin_lock_irq(&intfdata->susp_lock);
832         portdata->opened = 1;
833         spin_unlock_irq(&intfdata->susp_lock);
834         usb_autopm_put_interface(serial->interface);
835 
836         return 0;
837 }
838 
839 
840 static void sierra_dtr_rts(struct usb_serial_port *port, int on)
841 {
842         struct sierra_port_private *portdata;
843 
844         portdata = usb_get_serial_port_data(port);
845         portdata->rts_state = on;
846         portdata->dtr_state = on;
847 
848         sierra_send_setup(port);
849 }
850 
851 static int sierra_startup(struct usb_serial *serial)
852 {
853         struct sierra_intf_private *intfdata;
854 
855         intfdata = kzalloc(sizeof(*intfdata), GFP_KERNEL);
856         if (!intfdata)
857                 return -ENOMEM;
858 
859         spin_lock_init(&intfdata->susp_lock);
860 
861         usb_set_serial_data(serial, intfdata);
862 
863         /* Set Device mode to D0 */
864         sierra_set_power_state(serial->dev, 0x0000);
865 
866         /* Check NMEA and set */
867         if (nmea)
868                 sierra_vsc_set_nmea(serial->dev, 1);
869 
870         return 0;
871 }
872 
873 static void sierra_release(struct usb_serial *serial)
874 {
875         struct sierra_intf_private *intfdata;
876 
877         intfdata = usb_get_serial_data(serial);
878         kfree(intfdata);
879 }
880 
881 static int sierra_port_probe(struct usb_serial_port *port)
882 {
883         struct usb_serial *serial = port->serial;
884         struct sierra_port_private *portdata;
885         const struct sierra_iface_info *himemoryp;
886         u8 ifnum;
887 
888         portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
889         if (!portdata)
890                 return -ENOMEM;
891 
892         spin_lock_init(&portdata->lock);
893         init_usb_anchor(&portdata->active);
894         init_usb_anchor(&portdata->delayed);
895 
896         /* Assume low memory requirements */
897         portdata->num_out_urbs = N_OUT_URB;
898         portdata->num_in_urbs  = N_IN_URB;
899 
900         /* Determine actual memory requirements */
901         if (serial->num_ports == 1) {
902                 /* Get interface number for composite device */
903                 ifnum = sierra_calc_interface(serial);
904                 himemoryp = &typeB_interface_list;
905         } else {
906                 /* This is really the usb-serial port number of the interface
907                  * rather than the interface number.
908                  */
909                 ifnum = port->port_number;
910                 himemoryp = &typeA_interface_list;
911         }
912 
913         if (is_himemory(ifnum, himemoryp)) {
914                 portdata->num_out_urbs = N_OUT_URB_HM;
915                 portdata->num_in_urbs  = N_IN_URB_HM;
916         }
917 
918         dev_dbg(&port->dev,
919                         "Memory usage (urbs) interface #%d, in=%d, out=%d\n",
920                         ifnum, portdata->num_in_urbs, portdata->num_out_urbs);
921 
922         usb_set_serial_port_data(port, portdata);
923 
924         return 0;
925 }
926 
927 static int sierra_port_remove(struct usb_serial_port *port)
928 {
929         struct sierra_port_private *portdata;
930 
931         portdata = usb_get_serial_port_data(port);
932         kfree(portdata);
933 
934         return 0;
935 }
936 
937 #ifdef CONFIG_PM
938 static void stop_read_write_urbs(struct usb_serial *serial)
939 {
940         int i;
941         struct usb_serial_port *port;
942         struct sierra_port_private *portdata;
943 
944         /* Stop reading/writing urbs */
945         for (i = 0; i < serial->num_ports; ++i) {
946                 port = serial->port[i];
947                 portdata = usb_get_serial_port_data(port);
948                 sierra_stop_rx_urbs(port);
949                 usb_kill_anchored_urbs(&portdata->active);
950         }
951 }
952 
953 static int sierra_suspend(struct usb_serial *serial, pm_message_t message)
954 {
955         struct sierra_intf_private *intfdata;
956         int b;
957 
958         if (PMSG_IS_AUTO(message)) {
959                 intfdata = serial->private;
960                 spin_lock_irq(&intfdata->susp_lock);
961                 b = intfdata->in_flight;
962 
963                 if (b) {
964                         spin_unlock_irq(&intfdata->susp_lock);
965                         return -EBUSY;
966                 } else {
967                         intfdata->suspended = 1;
968                         spin_unlock_irq(&intfdata->susp_lock);
969                 }
970         }
971         stop_read_write_urbs(serial);
972 
973         return 0;
974 }
975 
976 static int sierra_resume(struct usb_serial *serial)
977 {
978         struct usb_serial_port *port;
979         struct sierra_intf_private *intfdata = serial->private;
980         struct sierra_port_private *portdata;
981         struct urb *urb;
982         int ec = 0;
983         int i, err;
984 
985         spin_lock_irq(&intfdata->susp_lock);
986         for (i = 0; i < serial->num_ports; i++) {
987                 port = serial->port[i];
988                 portdata = usb_get_serial_port_data(port);
989 
990                 while ((urb = usb_get_from_anchor(&portdata->delayed))) {
991                         usb_anchor_urb(urb, &portdata->active);
992                         intfdata->in_flight++;
993                         err = usb_submit_urb(urb, GFP_ATOMIC);
994                         if (err < 0) {
995                                 intfdata->in_flight--;
996                                 usb_unanchor_urb(urb);
997                                 usb_scuttle_anchored_urbs(&portdata->delayed);
998                                 break;
999                         }
1000                 }
1001 
1002                 if (portdata->opened) {
1003                         err = sierra_submit_rx_urbs(port, GFP_ATOMIC);
1004                         if (err)
1005                                 ec++;
1006                 }
1007         }
1008         intfdata->suspended = 0;
1009         spin_unlock_irq(&intfdata->susp_lock);
1010 
1011         return ec ? -EIO : 0;
1012 }
1013 
1014 #else
1015 #define sierra_suspend NULL
1016 #define sierra_resume NULL
1017 #endif
1018 
1019 static struct usb_serial_driver sierra_device = {
1020         .driver = {
1021                 .owner =        THIS_MODULE,
1022                 .name =         "sierra",
1023         },
1024         .description       = "Sierra USB modem",
1025         .id_table          = id_table,
1026         .calc_num_ports    = sierra_calc_num_ports,
1027         .probe             = sierra_probe,
1028         .open              = sierra_open,
1029         .close             = sierra_close,
1030         .dtr_rts           = sierra_dtr_rts,
1031         .write             = sierra_write,
1032         .write_room        = sierra_write_room,
1033         .set_termios       = sierra_set_termios,
1034         .tiocmget          = sierra_tiocmget,
1035         .tiocmset          = sierra_tiocmset,
1036         .attach            = sierra_startup,
1037         .release           = sierra_release,
1038         .port_probe        = sierra_port_probe,
1039         .port_remove       = sierra_port_remove,
1040         .suspend           = sierra_suspend,
1041         .resume            = sierra_resume,
1042         .read_int_callback = sierra_instat_callback,
1043 };
1044 
1045 static struct usb_serial_driver * const serial_drivers[] = {
1046         &sierra_device, NULL
1047 };
1048 
1049 module_usb_serial_driver(serial_drivers, id_table);
1050 
1051 MODULE_AUTHOR(DRIVER_AUTHOR);
1052 MODULE_DESCRIPTION(DRIVER_DESC);
1053 MODULE_LICENSE("GPL");
1054 
1055 module_param(nmea, bool, S_IRUGO | S_IWUSR);
1056 MODULE_PARM_DESC(nmea, "NMEA streaming");
1057 

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