Version:  2.0.40 2.2.26 2.4.37 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 3.15

Linux/drivers/isdn/gigaset/bas-gigaset.c

  1 /*
  2  * USB driver for Gigaset 307x base via direct USB connection.
  3  *
  4  * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
  5  *                       Tilman Schmidt <tilman@imap.cc>,
  6  *                       Stefan Eilers.
  7  *
  8  * =====================================================================
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License as
 11  *      published by the Free Software Foundation; either version 2 of
 12  *      the License, or (at your option) any later version.
 13  * =====================================================================
 14  */
 15 
 16 #include "gigaset.h"
 17 #include <linux/usb.h>
 18 #include <linux/module.h>
 19 #include <linux/moduleparam.h>
 20 
 21 /* Version Information */
 22 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
 23 #define DRIVER_DESC "USB Driver for Gigaset 307x"
 24 
 25 
 26 /* Module parameters */
 27 
 28 static int startmode = SM_ISDN;
 29 static int cidmode = 1;
 30 
 31 module_param(startmode, int, S_IRUGO);
 32 module_param(cidmode, int, S_IRUGO);
 33 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
 34 MODULE_PARM_DESC(cidmode, "Call-ID mode");
 35 
 36 #define GIGASET_MINORS     1
 37 #define GIGASET_MINOR      16
 38 #define GIGASET_MODULENAME "bas_gigaset"
 39 #define GIGASET_DEVNAME    "ttyGB"
 40 
 41 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
 42 #define IF_WRITEBUF 264
 43 
 44 /* interrupt pipe message size according to ibid. ch. 2.2 */
 45 #define IP_MSGSIZE 3
 46 
 47 /* Values for the Gigaset 307x */
 48 #define USB_GIGA_VENDOR_ID      0x0681
 49 #define USB_3070_PRODUCT_ID     0x0001
 50 #define USB_3075_PRODUCT_ID     0x0002
 51 #define USB_SX303_PRODUCT_ID    0x0021
 52 #define USB_SX353_PRODUCT_ID    0x0022
 53 
 54 /* table of devices that work with this driver */
 55 static const struct usb_device_id gigaset_table[] = {
 56         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
 57         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
 58         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
 59         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
 60         { } /* Terminating entry */
 61 };
 62 
 63 MODULE_DEVICE_TABLE(usb, gigaset_table);
 64 
 65 /*======================= local function prototypes ==========================*/
 66 
 67 /* function called if a new device belonging to this driver is connected */
 68 static int gigaset_probe(struct usb_interface *interface,
 69                          const struct usb_device_id *id);
 70 
 71 /* Function will be called if the device is unplugged */
 72 static void gigaset_disconnect(struct usb_interface *interface);
 73 
 74 /* functions called before/after suspend */
 75 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
 76 static int gigaset_resume(struct usb_interface *intf);
 77 
 78 /* functions called before/after device reset */
 79 static int gigaset_pre_reset(struct usb_interface *intf);
 80 static int gigaset_post_reset(struct usb_interface *intf);
 81 
 82 static int atread_submit(struct cardstate *, int);
 83 static void stopurbs(struct bas_bc_state *);
 84 static int req_submit(struct bc_state *, int, int, int);
 85 static int atwrite_submit(struct cardstate *, unsigned char *, int);
 86 static int start_cbsend(struct cardstate *);
 87 
 88 /*============================================================================*/
 89 
 90 struct bas_cardstate {
 91         struct usb_device       *udev;          /* USB device pointer */
 92         struct usb_interface    *interface;     /* interface for this device */
 93         unsigned char           minor;          /* starting minor number */
 94 
 95         struct urb              *urb_ctrl;      /* control pipe default URB */
 96         struct usb_ctrlrequest  dr_ctrl;
 97         struct timer_list       timer_ctrl;     /* control request timeout */
 98         int                     retry_ctrl;
 99 
100         struct timer_list       timer_atrdy;    /* AT command ready timeout */
101         struct urb              *urb_cmd_out;   /* for sending AT commands */
102         struct usb_ctrlrequest  dr_cmd_out;
103         int                     retry_cmd_out;
104 
105         struct urb              *urb_cmd_in;    /* for receiving AT replies */
106         struct usb_ctrlrequest  dr_cmd_in;
107         struct timer_list       timer_cmd_in;   /* receive request timeout */
108         unsigned char           *rcvbuf;        /* AT reply receive buffer */
109 
110         struct urb              *urb_int_in;    /* URB for interrupt pipe */
111         unsigned char           *int_in_buf;
112         struct work_struct      int_in_wq;      /* for usb_clear_halt() */
113         struct timer_list       timer_int_in;   /* int read retry delay */
114         int                     retry_int_in;
115 
116         spinlock_t              lock;           /* locks all following */
117         int                     basstate;       /* bitmap (BS_*) */
118         int                     pending;        /* uncompleted base request */
119         wait_queue_head_t       waitqueue;
120         int                     rcvbuf_size;    /* size of AT receive buffer */
121                                                 /* 0: no receive in progress */
122         int                     retry_cmd_in;   /* receive req retry count */
123 };
124 
125 /* status of direct USB connection to 307x base (bits in basstate) */
126 #define BS_ATOPEN       0x001   /* AT channel open */
127 #define BS_B1OPEN       0x002   /* B channel 1 open */
128 #define BS_B2OPEN       0x004   /* B channel 2 open */
129 #define BS_ATREADY      0x008   /* base ready for AT command */
130 #define BS_INIT         0x010   /* base has signalled INIT_OK */
131 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
132 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
133 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
134 #define BS_SUSPEND      0x100   /* USB port suspended */
135 #define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
136 
137 
138 static struct gigaset_driver *driver;
139 
140 /* usb specific object needed to register this driver with the usb subsystem */
141 static struct usb_driver gigaset_usb_driver = {
142         .name =         GIGASET_MODULENAME,
143         .probe =        gigaset_probe,
144         .disconnect =   gigaset_disconnect,
145         .id_table =     gigaset_table,
146         .suspend =      gigaset_suspend,
147         .resume =       gigaset_resume,
148         .reset_resume = gigaset_post_reset,
149         .pre_reset =    gigaset_pre_reset,
150         .post_reset =   gigaset_post_reset,
151         .disable_hub_initiated_lpm = 1,
152 };
153 
154 /* get message text for usb_submit_urb return code
155  */
156 static char *get_usb_rcmsg(int rc)
157 {
158         static char unkmsg[28];
159 
160         switch (rc) {
161         case 0:
162                 return "success";
163         case -ENOMEM:
164                 return "out of memory";
165         case -ENODEV:
166                 return "device not present";
167         case -ENOENT:
168                 return "endpoint not present";
169         case -ENXIO:
170                 return "URB type not supported";
171         case -EINVAL:
172                 return "invalid argument";
173         case -EAGAIN:
174                 return "start frame too early or too much scheduled";
175         case -EFBIG:
176                 return "too many isoc frames requested";
177         case -EPIPE:
178                 return "endpoint stalled";
179         case -EMSGSIZE:
180                 return "invalid packet size";
181         case -ENOSPC:
182                 return "would overcommit USB bandwidth";
183         case -ESHUTDOWN:
184                 return "device shut down";
185         case -EPERM:
186                 return "reject flag set";
187         case -EHOSTUNREACH:
188                 return "device suspended";
189         default:
190                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
191                 return unkmsg;
192         }
193 }
194 
195 /* get message text for USB status code
196  */
197 static char *get_usb_statmsg(int status)
198 {
199         static char unkmsg[28];
200 
201         switch (status) {
202         case 0:
203                 return "success";
204         case -ENOENT:
205                 return "unlinked (sync)";
206         case -EINPROGRESS:
207                 return "URB still pending";
208         case -EPROTO:
209                 return "bitstuff error, timeout, or unknown USB error";
210         case -EILSEQ:
211                 return "CRC mismatch, timeout, or unknown USB error";
212         case -ETIME:
213                 return "USB response timeout";
214         case -EPIPE:
215                 return "endpoint stalled";
216         case -ECOMM:
217                 return "IN buffer overrun";
218         case -ENOSR:
219                 return "OUT buffer underrun";
220         case -EOVERFLOW:
221                 return "endpoint babble";
222         case -EREMOTEIO:
223                 return "short packet";
224         case -ENODEV:
225                 return "device removed";
226         case -EXDEV:
227                 return "partial isoc transfer";
228         case -EINVAL:
229                 return "ISO madness";
230         case -ECONNRESET:
231                 return "unlinked (async)";
232         case -ESHUTDOWN:
233                 return "device shut down";
234         default:
235                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
236                 return unkmsg;
237         }
238 }
239 
240 /* usb_pipetype_str
241  * retrieve string representation of USB pipe type
242  */
243 static inline char *usb_pipetype_str(int pipe)
244 {
245         if (usb_pipeisoc(pipe))
246                 return "Isoc";
247         if (usb_pipeint(pipe))
248                 return "Int";
249         if (usb_pipecontrol(pipe))
250                 return "Ctrl";
251         if (usb_pipebulk(pipe))
252                 return "Bulk";
253         return "?";
254 }
255 
256 /* dump_urb
257  * write content of URB to syslog for debugging
258  */
259 static inline void dump_urb(enum debuglevel level, const char *tag,
260                             struct urb *urb)
261 {
262 #ifdef CONFIG_GIGASET_DEBUG
263         int i;
264         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
265         if (urb) {
266                 gig_dbg(level,
267                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
268                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
269                         (unsigned long) urb->dev,
270                         usb_pipetype_str(urb->pipe),
271                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
272                         usb_pipein(urb->pipe) ? "in" : "out",
273                         (unsigned long) urb->hcpriv,
274                         urb->transfer_flags);
275                 gig_dbg(level,
276                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
277                         "setup_packet=0x%08lx,",
278                         (unsigned long) urb->transfer_buffer,
279                         urb->transfer_buffer_length, urb->actual_length,
280                         (unsigned long) urb->setup_packet);
281                 gig_dbg(level,
282                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
283                         "error_count=%d,",
284                         urb->start_frame, urb->number_of_packets, urb->interval,
285                         urb->error_count);
286                 gig_dbg(level,
287                         "  context=0x%08lx, complete=0x%08lx, "
288                         "iso_frame_desc[]={",
289                         (unsigned long) urb->context,
290                         (unsigned long) urb->complete);
291                 for (i = 0; i < urb->number_of_packets; i++) {
292                         struct usb_iso_packet_descriptor *pifd
293                                 = &urb->iso_frame_desc[i];
294                         gig_dbg(level,
295                                 "    {offset=%u, length=%u, actual_length=%u, "
296                                 "status=%u}",
297                                 pifd->offset, pifd->length, pifd->actual_length,
298                                 pifd->status);
299                 }
300         }
301         gig_dbg(level, "}}");
302 #endif
303 }
304 
305 /* read/set modem control bits etc. (m10x only) */
306 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
307                                   unsigned new_state)
308 {
309         return -EINVAL;
310 }
311 
312 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
313 {
314         return -EINVAL;
315 }
316 
317 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
318 {
319         return -EINVAL;
320 }
321 
322 /* set/clear bits in base connection state, return previous state
323  */
324 static inline int update_basstate(struct bas_cardstate *ucs,
325                                   int set, int clear)
326 {
327         unsigned long flags;
328         int state;
329 
330         spin_lock_irqsave(&ucs->lock, flags);
331         state = ucs->basstate;
332         ucs->basstate = (state & ~clear) | set;
333         spin_unlock_irqrestore(&ucs->lock, flags);
334         return state;
335 }
336 
337 /* error_hangup
338  * hang up any existing connection because of an unrecoverable error
339  * This function may be called from any context and takes care of scheduling
340  * the necessary actions for execution outside of interrupt context.
341  * cs->lock must not be held.
342  * argument:
343  *      B channel control structure
344  */
345 static inline void error_hangup(struct bc_state *bcs)
346 {
347         struct cardstate *cs = bcs->cs;
348 
349         gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
350         gigaset_schedule_event(cs);
351 }
352 
353 /* error_reset
354  * reset Gigaset device because of an unrecoverable error
355  * This function may be called from any context, and takes care of
356  * scheduling the necessary actions for execution outside of interrupt context.
357  * cs->hw.bas->lock must not be held.
358  * argument:
359  *      controller state structure
360  */
361 static inline void error_reset(struct cardstate *cs)
362 {
363         /* reset interrupt pipe to recover (ignore errors) */
364         update_basstate(cs->hw.bas, BS_RESETTING, 0);
365         if (req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT))
366                 /* submission failed, escalate to USB port reset */
367                 usb_queue_reset_device(cs->hw.bas->interface);
368 }
369 
370 /* check_pending
371  * check for completion of pending control request
372  * parameter:
373  *      ucs     hardware specific controller state structure
374  */
375 static void check_pending(struct bas_cardstate *ucs)
376 {
377         unsigned long flags;
378 
379         spin_lock_irqsave(&ucs->lock, flags);
380         switch (ucs->pending) {
381         case 0:
382                 break;
383         case HD_OPEN_ATCHANNEL:
384                 if (ucs->basstate & BS_ATOPEN)
385                         ucs->pending = 0;
386                 break;
387         case HD_OPEN_B1CHANNEL:
388                 if (ucs->basstate & BS_B1OPEN)
389                         ucs->pending = 0;
390                 break;
391         case HD_OPEN_B2CHANNEL:
392                 if (ucs->basstate & BS_B2OPEN)
393                         ucs->pending = 0;
394                 break;
395         case HD_CLOSE_ATCHANNEL:
396                 if (!(ucs->basstate & BS_ATOPEN))
397                         ucs->pending = 0;
398                 break;
399         case HD_CLOSE_B1CHANNEL:
400                 if (!(ucs->basstate & BS_B1OPEN))
401                         ucs->pending = 0;
402                 break;
403         case HD_CLOSE_B2CHANNEL:
404                 if (!(ucs->basstate & BS_B2OPEN))
405                         ucs->pending = 0;
406                 break;
407         case HD_DEVICE_INIT_ACK:                /* no reply expected */
408                 ucs->pending = 0;
409                 break;
410         case HD_RESET_INTERRUPT_PIPE:
411                 if (!(ucs->basstate & BS_RESETTING))
412                         ucs->pending = 0;
413                 break;
414         /*
415          * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
416          * and should never end up here
417          */
418         default:
419                 dev_warn(&ucs->interface->dev,
420                          "unknown pending request 0x%02x cleared\n",
421                          ucs->pending);
422                 ucs->pending = 0;
423         }
424 
425         if (!ucs->pending)
426                 del_timer(&ucs->timer_ctrl);
427 
428         spin_unlock_irqrestore(&ucs->lock, flags);
429 }
430 
431 /* cmd_in_timeout
432  * timeout routine for command input request
433  * argument:
434  *      controller state structure
435  */
436 static void cmd_in_timeout(unsigned long data)
437 {
438         struct cardstate *cs = (struct cardstate *) data;
439         struct bas_cardstate *ucs = cs->hw.bas;
440         int rc;
441 
442         if (!ucs->rcvbuf_size) {
443                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
444                 return;
445         }
446 
447         if (ucs->retry_cmd_in++ >= BAS_RETRY) {
448                 dev_err(cs->dev,
449                         "control read: timeout, giving up after %d tries\n",
450                         ucs->retry_cmd_in);
451                 kfree(ucs->rcvbuf);
452                 ucs->rcvbuf = NULL;
453                 ucs->rcvbuf_size = 0;
454                 error_reset(cs);
455                 return;
456         }
457 
458         gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
459                 __func__, ucs->retry_cmd_in);
460         rc = atread_submit(cs, BAS_TIMEOUT);
461         if (rc < 0) {
462                 kfree(ucs->rcvbuf);
463                 ucs->rcvbuf = NULL;
464                 ucs->rcvbuf_size = 0;
465                 if (rc != -ENODEV)
466                         error_reset(cs);
467         }
468 }
469 
470 /* read_ctrl_callback
471  * USB completion handler for control pipe input
472  * called by the USB subsystem in interrupt context
473  * parameter:
474  *      urb     USB request block
475  *              urb->context = inbuf structure for controller state
476  */
477 static void read_ctrl_callback(struct urb *urb)
478 {
479         struct inbuf_t *inbuf = urb->context;
480         struct cardstate *cs = inbuf->cs;
481         struct bas_cardstate *ucs = cs->hw.bas;
482         int status = urb->status;
483         unsigned numbytes;
484         int rc;
485 
486         update_basstate(ucs, 0, BS_ATRDPEND);
487         wake_up(&ucs->waitqueue);
488         del_timer(&ucs->timer_cmd_in);
489 
490         switch (status) {
491         case 0:                         /* normal completion */
492                 numbytes = urb->actual_length;
493                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
494                         dev_warn(cs->dev,
495                                  "control read: received %d chars, expected %d\n",
496                                  numbytes, ucs->rcvbuf_size);
497                         if (numbytes > ucs->rcvbuf_size)
498                                 numbytes = ucs->rcvbuf_size;
499                 }
500 
501                 /* copy received bytes to inbuf, notify event layer */
502                 if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
503                         gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
504                         gigaset_schedule_event(cs);
505                 }
506                 break;
507 
508         case -ENOENT:                   /* cancelled */
509         case -ECONNRESET:               /* cancelled (async) */
510         case -EINPROGRESS:              /* pending */
511         case -ENODEV:                   /* device removed */
512         case -ESHUTDOWN:                /* device shut down */
513                 /* no further action necessary */
514                 gig_dbg(DEBUG_USBREQ, "%s: %s",
515                         __func__, get_usb_statmsg(status));
516                 break;
517 
518         default:                        /* other errors: retry */
519                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
520                         gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
521                                 get_usb_statmsg(status), ucs->retry_cmd_in);
522                         rc = atread_submit(cs, BAS_TIMEOUT);
523                         if (rc >= 0)
524                                 /* successfully resubmitted, skip freeing */
525                                 return;
526                         if (rc == -ENODEV)
527                                 /* disconnect, no further action necessary */
528                                 break;
529                 }
530                 dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
531                         get_usb_statmsg(status), ucs->retry_cmd_in);
532                 error_reset(cs);
533         }
534 
535         /* read finished, free buffer */
536         kfree(ucs->rcvbuf);
537         ucs->rcvbuf = NULL;
538         ucs->rcvbuf_size = 0;
539 }
540 
541 /* atread_submit
542  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
543  * parameters:
544  *      cs      controller state structure
545  *      timeout timeout in 1/10 sec., 0: none
546  * return value:
547  *      0 on success
548  *      -EBUSY if another request is pending
549  *      any URB submission error code
550  */
551 static int atread_submit(struct cardstate *cs, int timeout)
552 {
553         struct bas_cardstate *ucs = cs->hw.bas;
554         int basstate;
555         int ret;
556 
557         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
558                 ucs->rcvbuf_size);
559 
560         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
561         if (basstate & BS_ATRDPEND) {
562                 dev_err(cs->dev,
563                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
564                 return -EBUSY;
565         }
566 
567         if (basstate & BS_SUSPEND) {
568                 dev_notice(cs->dev,
569                            "HD_READ_ATMESSAGE not submitted, "
570                            "suspend in progress\n");
571                 update_basstate(ucs, 0, BS_ATRDPEND);
572                 /* treat like disconnect */
573                 return -ENODEV;
574         }
575 
576         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
577         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
578         ucs->dr_cmd_in.wValue = 0;
579         ucs->dr_cmd_in.wIndex = 0;
580         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
581         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
582                              usb_rcvctrlpipe(ucs->udev, 0),
583                              (unsigned char *) &ucs->dr_cmd_in,
584                              ucs->rcvbuf, ucs->rcvbuf_size,
585                              read_ctrl_callback, cs->inbuf);
586 
587         ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
588         if (ret != 0) {
589                 update_basstate(ucs, 0, BS_ATRDPEND);
590                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
591                         get_usb_rcmsg(ret));
592                 return ret;
593         }
594 
595         if (timeout > 0) {
596                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
597                 mod_timer(&ucs->timer_cmd_in, jiffies + timeout * HZ / 10);
598         }
599         return 0;
600 }
601 
602 /* int_in_work
603  * workqueue routine to clear halt on interrupt in endpoint
604  */
605 
606 static void int_in_work(struct work_struct *work)
607 {
608         struct bas_cardstate *ucs =
609                 container_of(work, struct bas_cardstate, int_in_wq);
610         struct urb *urb = ucs->urb_int_in;
611         struct cardstate *cs = urb->context;
612         int rc;
613 
614         /* clear halt condition */
615         rc = usb_clear_halt(ucs->udev, urb->pipe);
616         gig_dbg(DEBUG_USBREQ, "clear_halt: %s", get_usb_rcmsg(rc));
617         if (rc == 0)
618                 /* success, resubmit interrupt read URB */
619                 rc = usb_submit_urb(urb, GFP_ATOMIC);
620 
621         switch (rc) {
622         case 0:         /* success */
623         case -ENODEV:   /* device gone */
624         case -EINVAL:   /* URB already resubmitted, or terminal badness */
625                 break;
626         default:        /* failure: try to recover by resetting the device */
627                 dev_err(cs->dev, "clear halt failed: %s\n", get_usb_rcmsg(rc));
628                 rc = usb_lock_device_for_reset(ucs->udev, ucs->interface);
629                 if (rc == 0) {
630                         rc = usb_reset_device(ucs->udev);
631                         usb_unlock_device(ucs->udev);
632                 }
633         }
634         ucs->retry_int_in = 0;
635 }
636 
637 /* int_in_resubmit
638  * timer routine for interrupt read delayed resubmit
639  * argument:
640  *      controller state structure
641  */
642 static void int_in_resubmit(unsigned long data)
643 {
644         struct cardstate *cs = (struct cardstate *) data;
645         struct bas_cardstate *ucs = cs->hw.bas;
646         int rc;
647 
648         if (ucs->retry_int_in++ >= BAS_RETRY) {
649                 dev_err(cs->dev, "interrupt read: giving up after %d tries\n",
650                         ucs->retry_int_in);
651                 usb_queue_reset_device(ucs->interface);
652                 return;
653         }
654 
655         gig_dbg(DEBUG_USBREQ, "%s: retry %d", __func__, ucs->retry_int_in);
656         rc = usb_submit_urb(ucs->urb_int_in, GFP_ATOMIC);
657         if (rc != 0 && rc != -ENODEV) {
658                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
659                         get_usb_rcmsg(rc));
660                 usb_queue_reset_device(ucs->interface);
661         }
662 }
663 
664 /* read_int_callback
665  * USB completion handler for interrupt pipe input
666  * called by the USB subsystem in interrupt context
667  * parameter:
668  *      urb     USB request block
669  *              urb->context = controller state structure
670  */
671 static void read_int_callback(struct urb *urb)
672 {
673         struct cardstate *cs = urb->context;
674         struct bas_cardstate *ucs = cs->hw.bas;
675         struct bc_state *bcs;
676         int status = urb->status;
677         unsigned long flags;
678         int rc;
679         unsigned l;
680         int channel;
681 
682         switch (status) {
683         case 0:                 /* success */
684                 ucs->retry_int_in = 0;
685                 break;
686         case -EPIPE:                    /* endpoint stalled */
687                 schedule_work(&ucs->int_in_wq);
688                 /* fall through */
689         case -ENOENT:                   /* cancelled */
690         case -ECONNRESET:               /* cancelled (async) */
691         case -EINPROGRESS:              /* pending */
692         case -ENODEV:                   /* device removed */
693         case -ESHUTDOWN:                /* device shut down */
694                 /* no further action necessary */
695                 gig_dbg(DEBUG_USBREQ, "%s: %s",
696                         __func__, get_usb_statmsg(status));
697                 return;
698         case -EPROTO:                   /* protocol error or unplug */
699         case -EILSEQ:
700         case -ETIME:
701                 /* resubmit after delay */
702                 gig_dbg(DEBUG_USBREQ, "%s: %s",
703                         __func__, get_usb_statmsg(status));
704                 mod_timer(&ucs->timer_int_in, jiffies + HZ / 10);
705                 return;
706         default:                /* other errors: just resubmit */
707                 dev_warn(cs->dev, "interrupt read: %s\n",
708                          get_usb_statmsg(status));
709                 goto resubmit;
710         }
711 
712         /* drop incomplete packets even if the missing bytes wouldn't matter */
713         if (unlikely(urb->actual_length < IP_MSGSIZE)) {
714                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
715                          urb->actual_length);
716                 goto resubmit;
717         }
718 
719         l = (unsigned) ucs->int_in_buf[1] +
720                 (((unsigned) ucs->int_in_buf[2]) << 8);
721 
722         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
723                 urb->actual_length, (int)ucs->int_in_buf[0], l,
724                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
725 
726         channel = 0;
727 
728         switch (ucs->int_in_buf[0]) {
729         case HD_DEVICE_INIT_OK:
730                 update_basstate(ucs, BS_INIT, 0);
731                 break;
732 
733         case HD_READY_SEND_ATDATA:
734                 del_timer(&ucs->timer_atrdy);
735                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
736                 start_cbsend(cs);
737                 break;
738 
739         case HD_OPEN_B2CHANNEL_ACK:
740                 ++channel;
741         case HD_OPEN_B1CHANNEL_ACK:
742                 bcs = cs->bcs + channel;
743                 update_basstate(ucs, BS_B1OPEN << channel, 0);
744                 gigaset_bchannel_up(bcs);
745                 break;
746 
747         case HD_OPEN_ATCHANNEL_ACK:
748                 update_basstate(ucs, BS_ATOPEN, 0);
749                 start_cbsend(cs);
750                 break;
751 
752         case HD_CLOSE_B2CHANNEL_ACK:
753                 ++channel;
754         case HD_CLOSE_B1CHANNEL_ACK:
755                 bcs = cs->bcs + channel;
756                 update_basstate(ucs, 0, BS_B1OPEN << channel);
757                 stopurbs(bcs->hw.bas);
758                 gigaset_bchannel_down(bcs);
759                 break;
760 
761         case HD_CLOSE_ATCHANNEL_ACK:
762                 update_basstate(ucs, 0, BS_ATOPEN);
763                 break;
764 
765         case HD_B2_FLOW_CONTROL:
766                 ++channel;
767         case HD_B1_FLOW_CONTROL:
768                 bcs = cs->bcs + channel;
769                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
770                            &bcs->hw.bas->corrbytes);
771                 gig_dbg(DEBUG_ISO,
772                         "Flow control (channel %d, sub %d): 0x%02x => %d",
773                         channel, bcs->hw.bas->numsub, l,
774                         atomic_read(&bcs->hw.bas->corrbytes));
775                 break;
776 
777         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
778                 if (!l) {
779                         dev_warn(cs->dev,
780                                  "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
781                         break;
782                 }
783                 spin_lock_irqsave(&cs->lock, flags);
784                 if (ucs->basstate & BS_ATRDPEND) {
785                         spin_unlock_irqrestore(&cs->lock, flags);
786                         dev_warn(cs->dev,
787                                  "HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
788                                  l, ucs->rcvbuf_size);
789                         break;
790                 }
791                 if (ucs->rcvbuf_size) {
792                         /* throw away previous buffer - we have no queue */
793                         dev_err(cs->dev,
794                                 "receive AT data overrun, %d bytes lost\n",
795                                 ucs->rcvbuf_size);
796                         kfree(ucs->rcvbuf);
797                         ucs->rcvbuf_size = 0;
798                 }
799                 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
800                 if (ucs->rcvbuf == NULL) {
801                         spin_unlock_irqrestore(&cs->lock, flags);
802                         dev_err(cs->dev, "out of memory receiving AT data\n");
803                         break;
804                 }
805                 ucs->rcvbuf_size = l;
806                 ucs->retry_cmd_in = 0;
807                 rc = atread_submit(cs, BAS_TIMEOUT);
808                 if (rc < 0) {
809                         kfree(ucs->rcvbuf);
810                         ucs->rcvbuf = NULL;
811                         ucs->rcvbuf_size = 0;
812                 }
813                 spin_unlock_irqrestore(&cs->lock, flags);
814                 if (rc < 0 && rc != -ENODEV)
815                         error_reset(cs);
816                 break;
817 
818         case HD_RESET_INTERRUPT_PIPE_ACK:
819                 update_basstate(ucs, 0, BS_RESETTING);
820                 dev_notice(cs->dev, "interrupt pipe reset\n");
821                 break;
822 
823         case HD_SUSPEND_END:
824                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
825                 break;
826 
827         default:
828                 dev_warn(cs->dev,
829                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
830                          (int) ucs->int_in_buf[0], l);
831         }
832 
833         check_pending(ucs);
834         wake_up(&ucs->waitqueue);
835 
836 resubmit:
837         rc = usb_submit_urb(urb, GFP_ATOMIC);
838         if (unlikely(rc != 0 && rc != -ENODEV)) {
839                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
840                         get_usb_rcmsg(rc));
841                 error_reset(cs);
842         }
843 }
844 
845 /* read_iso_callback
846  * USB completion handler for B channel isochronous input
847  * called by the USB subsystem in interrupt context
848  * parameter:
849  *      urb     USB request block of completed request
850  *              urb->context = bc_state structure
851  */
852 static void read_iso_callback(struct urb *urb)
853 {
854         struct bc_state *bcs;
855         struct bas_bc_state *ubc;
856         int status = urb->status;
857         unsigned long flags;
858         int i, rc;
859 
860         /* status codes not worth bothering the tasklet with */
861         if (unlikely(status == -ENOENT ||
862                      status == -ECONNRESET ||
863                      status == -EINPROGRESS ||
864                      status == -ENODEV ||
865                      status == -ESHUTDOWN)) {
866                 gig_dbg(DEBUG_ISO, "%s: %s",
867                         __func__, get_usb_statmsg(status));
868                 return;
869         }
870 
871         bcs = urb->context;
872         ubc = bcs->hw.bas;
873 
874         spin_lock_irqsave(&ubc->isoinlock, flags);
875         if (likely(ubc->isoindone == NULL)) {
876                 /* pass URB to tasklet */
877                 ubc->isoindone = urb;
878                 ubc->isoinstatus = status;
879                 tasklet_hi_schedule(&ubc->rcvd_tasklet);
880         } else {
881                 /* tasklet still busy, drop data and resubmit URB */
882                 gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
883                 ubc->loststatus = status;
884                 for (i = 0; i < BAS_NUMFRAMES; i++) {
885                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
886                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
887                                      urb->iso_frame_desc[i].status != -EINPROGRESS))
888                                 ubc->loststatus = urb->iso_frame_desc[i].status;
889                         urb->iso_frame_desc[i].status = 0;
890                         urb->iso_frame_desc[i].actual_length = 0;
891                 }
892                 if (likely(ubc->running)) {
893                         /* urb->dev is clobbered by USB subsystem */
894                         urb->dev = bcs->cs->hw.bas->udev;
895                         urb->transfer_flags = URB_ISO_ASAP;
896                         urb->number_of_packets = BAS_NUMFRAMES;
897                         rc = usb_submit_urb(urb, GFP_ATOMIC);
898                         if (unlikely(rc != 0 && rc != -ENODEV)) {
899                                 dev_err(bcs->cs->dev,
900                                         "could not resubmit isoc read URB: %s\n",
901                                         get_usb_rcmsg(rc));
902                                 dump_urb(DEBUG_ISO, "isoc read", urb);
903                                 error_hangup(bcs);
904                         }
905                 }
906         }
907         spin_unlock_irqrestore(&ubc->isoinlock, flags);
908 }
909 
910 /* write_iso_callback
911  * USB completion handler for B channel isochronous output
912  * called by the USB subsystem in interrupt context
913  * parameter:
914  *      urb     USB request block of completed request
915  *              urb->context = isow_urbctx_t structure
916  */
917 static void write_iso_callback(struct urb *urb)
918 {
919         struct isow_urbctx_t *ucx;
920         struct bas_bc_state *ubc;
921         int status = urb->status;
922         unsigned long flags;
923 
924         /* status codes not worth bothering the tasklet with */
925         if (unlikely(status == -ENOENT ||
926                      status == -ECONNRESET ||
927                      status == -EINPROGRESS ||
928                      status == -ENODEV ||
929                      status == -ESHUTDOWN)) {
930                 gig_dbg(DEBUG_ISO, "%s: %s",
931                         __func__, get_usb_statmsg(status));
932                 return;
933         }
934 
935         /* pass URB context to tasklet */
936         ucx = urb->context;
937         ubc = ucx->bcs->hw.bas;
938         ucx->status = status;
939 
940         spin_lock_irqsave(&ubc->isooutlock, flags);
941         ubc->isooutovfl = ubc->isooutdone;
942         ubc->isooutdone = ucx;
943         spin_unlock_irqrestore(&ubc->isooutlock, flags);
944         tasklet_hi_schedule(&ubc->sent_tasklet);
945 }
946 
947 /* starturbs
948  * prepare and submit USB request blocks for isochronous input and output
949  * argument:
950  *      B channel control structure
951  * return value:
952  *      0 on success
953  *      < 0 on error (no URBs submitted)
954  */
955 static int starturbs(struct bc_state *bcs)
956 {
957         struct bas_bc_state *ubc = bcs->hw.bas;
958         struct urb *urb;
959         int j, k;
960         int rc;
961 
962         /* initialize L2 reception */
963         if (bcs->proto2 == L2_HDLC)
964                 bcs->inputstate |= INS_flag_hunt;
965 
966         /* submit all isochronous input URBs */
967         ubc->running = 1;
968         for (k = 0; k < BAS_INURBS; k++) {
969                 urb = ubc->isoinurbs[k];
970                 if (!urb) {
971                         rc = -EFAULT;
972                         goto error;
973                 }
974 
975                 urb->dev = bcs->cs->hw.bas->udev;
976                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
977                 urb->transfer_flags = URB_ISO_ASAP;
978                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
979                 urb->transfer_buffer_length = BAS_INBUFSIZE;
980                 urb->number_of_packets = BAS_NUMFRAMES;
981                 urb->interval = BAS_FRAMETIME;
982                 urb->complete = read_iso_callback;
983                 urb->context = bcs;
984                 for (j = 0; j < BAS_NUMFRAMES; j++) {
985                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
986                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
987                         urb->iso_frame_desc[j].status = 0;
988                         urb->iso_frame_desc[j].actual_length = 0;
989                 }
990 
991                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
992                 rc = usb_submit_urb(urb, GFP_ATOMIC);
993                 if (rc != 0)
994                         goto error;
995         }
996 
997         /* initialize L2 transmission */
998         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
999 
1000         /* set up isochronous output URBs for flag idling */
1001         for (k = 0; k < BAS_OUTURBS; ++k) {
1002                 urb = ubc->isoouturbs[k].urb;
1003                 if (!urb) {
1004                         rc = -EFAULT;
1005                         goto error;
1006                 }
1007                 urb->dev = bcs->cs->hw.bas->udev;
1008                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
1009                 urb->transfer_flags = URB_ISO_ASAP;
1010                 urb->transfer_buffer = ubc->isooutbuf->data;
1011                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1012                 urb->number_of_packets = BAS_NUMFRAMES;
1013                 urb->interval = BAS_FRAMETIME;
1014                 urb->complete = write_iso_callback;
1015                 urb->context = &ubc->isoouturbs[k];
1016                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
1017                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
1018                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
1019                         urb->iso_frame_desc[j].status = 0;
1020                         urb->iso_frame_desc[j].actual_length = 0;
1021                 }
1022                 ubc->isoouturbs[k].limit = -1;
1023         }
1024 
1025         /* keep one URB free, submit the others */
1026         for (k = 0; k < BAS_OUTURBS - 1; ++k) {
1027                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
1028                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
1029                 if (rc != 0)
1030                         goto error;
1031         }
1032         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
1033         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS - 1];
1034         ubc->isooutdone = ubc->isooutovfl = NULL;
1035         return 0;
1036 error:
1037         stopurbs(ubc);
1038         return rc;
1039 }
1040 
1041 /* stopurbs
1042  * cancel the USB request blocks for isochronous input and output
1043  * errors are silently ignored
1044  * argument:
1045  *      B channel control structure
1046  */
1047 static void stopurbs(struct bas_bc_state *ubc)
1048 {
1049         int k, rc;
1050 
1051         ubc->running = 0;
1052 
1053         for (k = 0; k < BAS_INURBS; ++k) {
1054                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1055                 gig_dbg(DEBUG_ISO,
1056                         "%s: isoc input URB %d unlinked, result = %s",
1057                         __func__, k, get_usb_rcmsg(rc));
1058         }
1059 
1060         for (k = 0; k < BAS_OUTURBS; ++k) {
1061                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1062                 gig_dbg(DEBUG_ISO,
1063                         "%s: isoc output URB %d unlinked, result = %s",
1064                         __func__, k, get_usb_rcmsg(rc));
1065         }
1066 }
1067 
1068 /* Isochronous Write - Bottom Half */
1069 /* =============================== */
1070 
1071 /* submit_iso_write_urb
1072  * fill and submit the next isochronous write URB
1073  * parameters:
1074  *      ucx     context structure containing URB
1075  * return value:
1076  *      number of frames submitted in URB
1077  *      0 if URB not submitted because no data available (isooutbuf busy)
1078  *      error code < 0 on error
1079  */
1080 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1081 {
1082         struct urb *urb = ucx->urb;
1083         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1084         struct usb_iso_packet_descriptor *ifd;
1085         int corrbytes, nframe, rc;
1086 
1087         /* urb->dev is clobbered by USB subsystem */
1088         urb->dev = ucx->bcs->cs->hw.bas->udev;
1089         urb->transfer_flags = URB_ISO_ASAP;
1090         urb->transfer_buffer = ubc->isooutbuf->data;
1091         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1092 
1093         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1094                 ifd = &urb->iso_frame_desc[nframe];
1095 
1096                 /* compute frame length according to flow control */
1097                 ifd->length = BAS_NORMFRAME;
1098                 corrbytes = atomic_read(&ubc->corrbytes);
1099                 if (corrbytes != 0) {
1100                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1101                                 __func__, corrbytes);
1102                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1103                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1104                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1105                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1106                         ifd->length += corrbytes;
1107                         atomic_add(-corrbytes, &ubc->corrbytes);
1108                 }
1109 
1110                 /* retrieve block of data to send */
1111                 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1112                 if (rc < 0) {
1113                         if (rc == -EBUSY) {
1114                                 gig_dbg(DEBUG_ISO,
1115                                         "%s: buffer busy at frame %d",
1116                                         __func__, nframe);
1117                                 /* tasklet will be restarted from
1118                                    gigaset_isoc_send_skb() */
1119                         } else {
1120                                 dev_err(ucx->bcs->cs->dev,
1121                                         "%s: buffer error %d at frame %d\n",
1122                                         __func__, rc, nframe);
1123                                 return rc;
1124                         }
1125                         break;
1126                 }
1127                 ifd->offset = rc;
1128                 ucx->limit = ubc->isooutbuf->nextread;
1129                 ifd->status = 0;
1130                 ifd->actual_length = 0;
1131         }
1132         if (unlikely(nframe == 0))
1133                 return 0;       /* no data to send */
1134         urb->number_of_packets = nframe;
1135 
1136         rc = usb_submit_urb(urb, GFP_ATOMIC);
1137         if (unlikely(rc)) {
1138                 if (rc == -ENODEV)
1139                         /* device removed - give up silently */
1140                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1141                 else
1142                         dev_err(ucx->bcs->cs->dev,
1143                                 "could not submit isoc write URB: %s\n",
1144                                 get_usb_rcmsg(rc));
1145                 return rc;
1146         }
1147         ++ubc->numsub;
1148         return nframe;
1149 }
1150 
1151 /* write_iso_tasklet
1152  * tasklet scheduled when an isochronous output URB from the Gigaset device
1153  * has completed
1154  * parameter:
1155  *      data    B channel state structure
1156  */
1157 static void write_iso_tasklet(unsigned long data)
1158 {
1159         struct bc_state *bcs = (struct bc_state *) data;
1160         struct bas_bc_state *ubc = bcs->hw.bas;
1161         struct cardstate *cs = bcs->cs;
1162         struct isow_urbctx_t *done, *next, *ovfl;
1163         struct urb *urb;
1164         int status;
1165         struct usb_iso_packet_descriptor *ifd;
1166         unsigned long flags;
1167         int i;
1168         struct sk_buff *skb;
1169         int len;
1170         int rc;
1171 
1172         /* loop while completed URBs arrive in time */
1173         for (;;) {
1174                 if (unlikely(!(ubc->running))) {
1175                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1176                         return;
1177                 }
1178 
1179                 /* retrieve completed URBs */
1180                 spin_lock_irqsave(&ubc->isooutlock, flags);
1181                 done = ubc->isooutdone;
1182                 ubc->isooutdone = NULL;
1183                 ovfl = ubc->isooutovfl;
1184                 ubc->isooutovfl = NULL;
1185                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1186                 if (ovfl) {
1187                         dev_err(cs->dev, "isoc write underrun\n");
1188                         error_hangup(bcs);
1189                         break;
1190                 }
1191                 if (!done)
1192                         break;
1193 
1194                 /* submit free URB if available */
1195                 spin_lock_irqsave(&ubc->isooutlock, flags);
1196                 next = ubc->isooutfree;
1197                 ubc->isooutfree = NULL;
1198                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1199                 if (next) {
1200                         rc = submit_iso_write_urb(next);
1201                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1202                                 /* could not submit URB, put it back */
1203                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1204                                 if (ubc->isooutfree == NULL) {
1205                                         ubc->isooutfree = next;
1206                                         next = NULL;
1207                                 }
1208                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1209                                 if (next) {
1210                                         /* couldn't put it back */
1211                                         dev_err(cs->dev,
1212                                                 "losing isoc write URB\n");
1213                                         error_hangup(bcs);
1214                                 }
1215                         }
1216                 }
1217 
1218                 /* process completed URB */
1219                 urb = done->urb;
1220                 status = done->status;
1221                 switch (status) {
1222                 case -EXDEV:                    /* partial completion */
1223                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1224                                 __func__);
1225                         /* fall through - what's the difference anyway? */
1226                 case 0:                         /* normal completion */
1227                         /* inspect individual frames
1228                          * assumptions (for lack of documentation):
1229                          * - actual_length bytes of first frame in error are
1230                          *   successfully sent
1231                          * - all following frames are not sent at all
1232                          */
1233                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1234                                 ifd = &urb->iso_frame_desc[i];
1235                                 if (ifd->status ||
1236                                     ifd->actual_length != ifd->length) {
1237                                         dev_warn(cs->dev,
1238                                                  "isoc write: frame %d[%d/%d]: %s\n",
1239                                                  i, ifd->actual_length,
1240                                                  ifd->length,
1241                                                  get_usb_statmsg(ifd->status));
1242                                         break;
1243                                 }
1244                         }
1245                         break;
1246                 case -EPIPE:                    /* stall - probably underrun */
1247                         dev_err(cs->dev, "isoc write: stalled\n");
1248                         error_hangup(bcs);
1249                         break;
1250                 default:                        /* other errors */
1251                         dev_warn(cs->dev, "isoc write: %s\n",
1252                                  get_usb_statmsg(status));
1253                 }
1254 
1255                 /* mark the write buffer area covered by this URB as free */
1256                 if (done->limit >= 0)
1257                         ubc->isooutbuf->read = done->limit;
1258 
1259                 /* mark URB as free */
1260                 spin_lock_irqsave(&ubc->isooutlock, flags);
1261                 next = ubc->isooutfree;
1262                 ubc->isooutfree = done;
1263                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1264                 if (next) {
1265                         /* only one URB still active - resubmit one */
1266                         rc = submit_iso_write_urb(next);
1267                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1268                                 /* couldn't submit */
1269                                 error_hangup(bcs);
1270                         }
1271                 }
1272         }
1273 
1274         /* process queued SKBs */
1275         while ((skb = skb_dequeue(&bcs->squeue))) {
1276                 /* copy to output buffer, doing L2 encapsulation */
1277                 len = skb->len;
1278                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1279                         /* insufficient buffer space, push back onto queue */
1280                         skb_queue_head(&bcs->squeue, skb);
1281                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1282                                 __func__, skb_queue_len(&bcs->squeue));
1283                         break;
1284                 }
1285                 skb_pull(skb, len);
1286                 gigaset_skb_sent(bcs, skb);
1287                 dev_kfree_skb_any(skb);
1288         }
1289 }
1290 
1291 /* Isochronous Read - Bottom Half */
1292 /* ============================== */
1293 
1294 /* read_iso_tasklet
1295  * tasklet scheduled when an isochronous input URB from the Gigaset device
1296  * has completed
1297  * parameter:
1298  *      data    B channel state structure
1299  */
1300 static void read_iso_tasklet(unsigned long data)
1301 {
1302         struct bc_state *bcs = (struct bc_state *) data;
1303         struct bas_bc_state *ubc = bcs->hw.bas;
1304         struct cardstate *cs = bcs->cs;
1305         struct urb *urb;
1306         int status;
1307         struct usb_iso_packet_descriptor *ifd;
1308         char *rcvbuf;
1309         unsigned long flags;
1310         int totleft, numbytes, offset, frame, rc;
1311 
1312         /* loop while more completed URBs arrive in the meantime */
1313         for (;;) {
1314                 /* retrieve URB */
1315                 spin_lock_irqsave(&ubc->isoinlock, flags);
1316                 urb = ubc->isoindone;
1317                 if (!urb) {
1318                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1319                         return;
1320                 }
1321                 status = ubc->isoinstatus;
1322                 ubc->isoindone = NULL;
1323                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1324                         dev_warn(cs->dev,
1325                                  "isoc read overrun, URB dropped (status: %s, %d bytes)\n",
1326                                  get_usb_statmsg(ubc->loststatus),
1327                                  ubc->isoinlost);
1328                         ubc->loststatus = -EINPROGRESS;
1329                 }
1330                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1331 
1332                 if (unlikely(!(ubc->running))) {
1333                         gig_dbg(DEBUG_ISO,
1334                                 "%s: channel not running, "
1335                                 "dropped URB with status: %s",
1336                                 __func__, get_usb_statmsg(status));
1337                         return;
1338                 }
1339 
1340                 switch (status) {
1341                 case 0:                         /* normal completion */
1342                         break;
1343                 case -EXDEV:                    /* inspect individual frames
1344                                                    (we do that anyway) */
1345                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1346                                 __func__);
1347                         break;
1348                 case -ENOENT:
1349                 case -ECONNRESET:
1350                 case -EINPROGRESS:
1351                         gig_dbg(DEBUG_ISO, "%s: %s",
1352                                 __func__, get_usb_statmsg(status));
1353                         continue;               /* -> skip */
1354                 case -EPIPE:
1355                         dev_err(cs->dev, "isoc read: stalled\n");
1356                         error_hangup(bcs);
1357                         continue;               /* -> skip */
1358                 default:                        /* other error */
1359                         dev_warn(cs->dev, "isoc read: %s\n",
1360                                  get_usb_statmsg(status));
1361                         goto error;
1362                 }
1363 
1364                 rcvbuf = urb->transfer_buffer;
1365                 totleft = urb->actual_length;
1366                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1367                         ifd = &urb->iso_frame_desc[frame];
1368                         numbytes = ifd->actual_length;
1369                         switch (ifd->status) {
1370                         case 0:                 /* success */
1371                                 break;
1372                         case -EPROTO:           /* protocol error or unplug */
1373                         case -EILSEQ:
1374                         case -ETIME:
1375                                 /* probably just disconnected, ignore */
1376                                 gig_dbg(DEBUG_ISO,
1377                                         "isoc read: frame %d[%d]: %s\n",
1378                                         frame, numbytes,
1379                                         get_usb_statmsg(ifd->status));
1380                                 break;
1381                         default:                /* other error */
1382                                 /* report, assume transferred bytes are ok */
1383                                 dev_warn(cs->dev,
1384                                          "isoc read: frame %d[%d]: %s\n",
1385                                          frame, numbytes,
1386                                          get_usb_statmsg(ifd->status));
1387                         }
1388                         if (unlikely(numbytes > BAS_MAXFRAME))
1389                                 dev_warn(cs->dev,
1390                                          "isoc read: frame %d[%d]: %s\n",
1391                                          frame, numbytes,
1392                                          "exceeds max frame size");
1393                         if (unlikely(numbytes > totleft)) {
1394                                 dev_warn(cs->dev,
1395                                          "isoc read: frame %d[%d]: %s\n",
1396                                          frame, numbytes,
1397                                          "exceeds total transfer length");
1398                                 numbytes = totleft;
1399                         }
1400                         offset = ifd->offset;
1401                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1402                                 dev_warn(cs->dev,
1403                                          "isoc read: frame %d[%d]: %s\n",
1404                                          frame, numbytes,
1405                                          "exceeds end of buffer");
1406                                 numbytes = BAS_INBUFSIZE - offset;
1407                         }
1408                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1409                         totleft -= numbytes;
1410                 }
1411                 if (unlikely(totleft > 0))
1412                         dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
1413                                  totleft);
1414 
1415 error:
1416                 /* URB processed, resubmit */
1417                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1418                         urb->iso_frame_desc[frame].status = 0;
1419                         urb->iso_frame_desc[frame].actual_length = 0;
1420                 }
1421                 /* urb->dev is clobbered by USB subsystem */
1422                 urb->dev = bcs->cs->hw.bas->udev;
1423                 urb->transfer_flags = URB_ISO_ASAP;
1424                 urb->number_of_packets = BAS_NUMFRAMES;
1425                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1426                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1427                         dev_err(cs->dev,
1428                                 "could not resubmit isoc read URB: %s\n",
1429                                 get_usb_rcmsg(rc));
1430                         dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
1431                         error_hangup(bcs);
1432                 }
1433         }
1434 }
1435 
1436 /* Channel Operations */
1437 /* ================== */
1438 
1439 /* req_timeout
1440  * timeout routine for control output request
1441  * argument:
1442  *      controller state structure
1443  */
1444 static void req_timeout(unsigned long data)
1445 {
1446         struct cardstate *cs = (struct cardstate *) data;
1447         struct bas_cardstate *ucs = cs->hw.bas;
1448         int pending;
1449         unsigned long flags;
1450 
1451         check_pending(ucs);
1452 
1453         spin_lock_irqsave(&ucs->lock, flags);
1454         pending = ucs->pending;
1455         ucs->pending = 0;
1456         spin_unlock_irqrestore(&ucs->lock, flags);
1457 
1458         switch (pending) {
1459         case 0:                                 /* no pending request */
1460                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1461                 break;
1462 
1463         case HD_OPEN_ATCHANNEL:
1464                 dev_err(cs->dev, "timeout opening AT channel\n");
1465                 error_reset(cs);
1466                 break;
1467 
1468         case HD_OPEN_B1CHANNEL:
1469                 dev_err(cs->dev, "timeout opening channel 1\n");
1470                 error_hangup(&cs->bcs[0]);
1471                 break;
1472 
1473         case HD_OPEN_B2CHANNEL:
1474                 dev_err(cs->dev, "timeout opening channel 2\n");
1475                 error_hangup(&cs->bcs[1]);
1476                 break;
1477 
1478         case HD_CLOSE_ATCHANNEL:
1479                 dev_err(cs->dev, "timeout closing AT channel\n");
1480                 error_reset(cs);
1481                 break;
1482 
1483         case HD_CLOSE_B1CHANNEL:
1484                 dev_err(cs->dev, "timeout closing channel 1\n");
1485                 error_reset(cs);
1486                 break;
1487 
1488         case HD_CLOSE_B2CHANNEL:
1489                 dev_err(cs->dev, "timeout closing channel 2\n");
1490                 error_reset(cs);
1491                 break;
1492 
1493         case HD_RESET_INTERRUPT_PIPE:
1494                 /* error recovery escalation */
1495                 dev_err(cs->dev,
1496                         "reset interrupt pipe timeout, attempting USB reset\n");
1497                 usb_queue_reset_device(ucs->interface);
1498                 break;
1499 
1500         default:
1501                 dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
1502                          pending);
1503         }
1504 
1505         wake_up(&ucs->waitqueue);
1506 }
1507 
1508 /* write_ctrl_callback
1509  * USB completion handler for control pipe output
1510  * called by the USB subsystem in interrupt context
1511  * parameter:
1512  *      urb     USB request block of completed request
1513  *              urb->context = hardware specific controller state structure
1514  */
1515 static void write_ctrl_callback(struct urb *urb)
1516 {
1517         struct bas_cardstate *ucs = urb->context;
1518         int status = urb->status;
1519         int rc;
1520         unsigned long flags;
1521 
1522         /* check status */
1523         switch (status) {
1524         case 0:                                 /* normal completion */
1525                 spin_lock_irqsave(&ucs->lock, flags);
1526                 switch (ucs->pending) {
1527                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1528                         del_timer(&ucs->timer_ctrl);
1529                         ucs->pending = 0;
1530                         break;
1531                 }
1532                 spin_unlock_irqrestore(&ucs->lock, flags);
1533                 return;
1534 
1535         case -ENOENT:                   /* cancelled */
1536         case -ECONNRESET:               /* cancelled (async) */
1537         case -EINPROGRESS:              /* pending */
1538         case -ENODEV:                   /* device removed */
1539         case -ESHUTDOWN:                /* device shut down */
1540                 /* ignore silently */
1541                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1542                         __func__, get_usb_statmsg(status));
1543                 break;
1544 
1545         default:                                /* any failure */
1546                 /* don't retry if suspend requested */
1547                 if (++ucs->retry_ctrl > BAS_RETRY ||
1548                     (ucs->basstate & BS_SUSPEND)) {
1549                         dev_err(&ucs->interface->dev,
1550                                 "control request 0x%02x failed: %s\n",
1551                                 ucs->dr_ctrl.bRequest,
1552                                 get_usb_statmsg(status));
1553                         break;          /* give up */
1554                 }
1555                 dev_notice(&ucs->interface->dev,
1556                            "control request 0x%02x: %s, retry %d\n",
1557                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1558                            ucs->retry_ctrl);
1559                 /* urb->dev is clobbered by USB subsystem */
1560                 urb->dev = ucs->udev;
1561                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1562                 if (unlikely(rc)) {
1563                         dev_err(&ucs->interface->dev,
1564                                 "could not resubmit request 0x%02x: %s\n",
1565                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1566                         break;
1567                 }
1568                 /* resubmitted */
1569                 return;
1570         }
1571 
1572         /* failed, clear pending request */
1573         spin_lock_irqsave(&ucs->lock, flags);
1574         del_timer(&ucs->timer_ctrl);
1575         ucs->pending = 0;
1576         spin_unlock_irqrestore(&ucs->lock, flags);
1577         wake_up(&ucs->waitqueue);
1578 }
1579 
1580 /* req_submit
1581  * submit a control output request without message buffer to the Gigaset base
1582  * and optionally start a timeout
1583  * parameters:
1584  *      bcs     B channel control structure
1585  *      req     control request code (HD_*)
1586  *      val     control request parameter value (set to 0 if unused)
1587  *      timeout timeout in seconds (0: no timeout)
1588  * return value:
1589  *      0 on success
1590  *      -EBUSY if another request is pending
1591  *      any URB submission error code
1592  */
1593 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1594 {
1595         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1596         int ret;
1597         unsigned long flags;
1598 
1599         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1600 
1601         spin_lock_irqsave(&ucs->lock, flags);
1602         if (ucs->pending) {
1603                 spin_unlock_irqrestore(&ucs->lock, flags);
1604                 dev_err(bcs->cs->dev,
1605                         "submission of request 0x%02x failed: "
1606                         "request 0x%02x still pending\n",
1607                         req, ucs->pending);
1608                 return -EBUSY;
1609         }
1610 
1611         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1612         ucs->dr_ctrl.bRequest = req;
1613         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1614         ucs->dr_ctrl.wIndex = 0;
1615         ucs->dr_ctrl.wLength = 0;
1616         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1617                              usb_sndctrlpipe(ucs->udev, 0),
1618                              (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1619                              write_ctrl_callback, ucs);
1620         ucs->retry_ctrl = 0;
1621         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1622         if (unlikely(ret)) {
1623                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1624                         req, get_usb_rcmsg(ret));
1625                 spin_unlock_irqrestore(&ucs->lock, flags);
1626                 return ret;
1627         }
1628         ucs->pending = req;
1629 
1630         if (timeout > 0) {
1631                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1632                 mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
1633         }
1634 
1635         spin_unlock_irqrestore(&ucs->lock, flags);
1636         return 0;
1637 }
1638 
1639 /* gigaset_init_bchannel
1640  * called by common.c to connect a B channel
1641  * initialize isochronous I/O and tell the Gigaset base to open the channel
1642  * argument:
1643  *      B channel control structure
1644  * return value:
1645  *      0 on success, error code < 0 on error
1646  */
1647 static int gigaset_init_bchannel(struct bc_state *bcs)
1648 {
1649         struct cardstate *cs = bcs->cs;
1650         int req, ret;
1651         unsigned long flags;
1652 
1653         spin_lock_irqsave(&cs->lock, flags);
1654         if (unlikely(!cs->connected)) {
1655                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1656                 spin_unlock_irqrestore(&cs->lock, flags);
1657                 return -ENODEV;
1658         }
1659 
1660         if (cs->hw.bas->basstate & BS_SUSPEND) {
1661                 dev_notice(cs->dev,
1662                            "not starting isoc I/O, suspend in progress\n");
1663                 spin_unlock_irqrestore(&cs->lock, flags);
1664                 return -EHOSTUNREACH;
1665         }
1666 
1667         ret = starturbs(bcs);
1668         if (ret < 0) {
1669                 spin_unlock_irqrestore(&cs->lock, flags);
1670                 dev_err(cs->dev,
1671                         "could not start isoc I/O for channel B%d: %s\n",
1672                         bcs->channel + 1,
1673                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1674                 if (ret != -ENODEV)
1675                         error_hangup(bcs);
1676                 return ret;
1677         }
1678 
1679         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1680         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1681         if (ret < 0) {
1682                 dev_err(cs->dev, "could not open channel B%d\n",
1683                         bcs->channel + 1);
1684                 stopurbs(bcs->hw.bas);
1685         }
1686 
1687         spin_unlock_irqrestore(&cs->lock, flags);
1688         if (ret < 0 && ret != -ENODEV)
1689                 error_hangup(bcs);
1690         return ret;
1691 }
1692 
1693 /* gigaset_close_bchannel
1694  * called by common.c to disconnect a B channel
1695  * tell the Gigaset base to close the channel
1696  * stopping isochronous I/O and LL notification will be done when the
1697  * acknowledgement for the close arrives
1698  * argument:
1699  *      B channel control structure
1700  * return value:
1701  *      0 on success, error code < 0 on error
1702  */
1703 static int gigaset_close_bchannel(struct bc_state *bcs)
1704 {
1705         struct cardstate *cs = bcs->cs;
1706         int req, ret;
1707         unsigned long flags;
1708 
1709         spin_lock_irqsave(&cs->lock, flags);
1710         if (unlikely(!cs->connected)) {
1711                 spin_unlock_irqrestore(&cs->lock, flags);
1712                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1713                 return -ENODEV;
1714         }
1715 
1716         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1717                 /* channel not running: just signal common.c */
1718                 spin_unlock_irqrestore(&cs->lock, flags);
1719                 gigaset_bchannel_down(bcs);
1720                 return 0;
1721         }
1722 
1723         /* channel running: tell device to close it */
1724         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1725         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1726         if (ret < 0)
1727                 dev_err(cs->dev, "closing channel B%d failed\n",
1728                         bcs->channel + 1);
1729 
1730         spin_unlock_irqrestore(&cs->lock, flags);
1731         return ret;
1732 }
1733 
1734 /* Device Operations */
1735 /* ================= */
1736 
1737 /* complete_cb
1738  * unqueue first command buffer from queue, waking any sleepers
1739  * must be called with cs->cmdlock held
1740  * parameter:
1741  *      cs      controller state structure
1742  */
1743 static void complete_cb(struct cardstate *cs)
1744 {
1745         struct cmdbuf_t *cb = cs->cmdbuf;
1746 
1747         /* unqueue completed buffer */
1748         cs->cmdbytes -= cs->curlen;
1749         gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1750                 cs->curlen, cs->cmdbytes);
1751         if (cb->next != NULL) {
1752                 cs->cmdbuf = cb->next;
1753                 cs->cmdbuf->prev = NULL;
1754                 cs->curlen = cs->cmdbuf->len;
1755         } else {
1756                 cs->cmdbuf = NULL;
1757                 cs->lastcmdbuf = NULL;
1758                 cs->curlen = 0;
1759         }
1760 
1761         if (cb->wake_tasklet)
1762                 tasklet_schedule(cb->wake_tasklet);
1763 
1764         kfree(cb);
1765 }
1766 
1767 /* write_command_callback
1768  * USB completion handler for AT command transmission
1769  * called by the USB subsystem in interrupt context
1770  * parameter:
1771  *      urb     USB request block of completed request
1772  *              urb->context = controller state structure
1773  */
1774 static void write_command_callback(struct urb *urb)
1775 {
1776         struct cardstate *cs = urb->context;
1777         struct bas_cardstate *ucs = cs->hw.bas;
1778         int status = urb->status;
1779         unsigned long flags;
1780 
1781         update_basstate(ucs, 0, BS_ATWRPEND);
1782         wake_up(&ucs->waitqueue);
1783 
1784         /* check status */
1785         switch (status) {
1786         case 0:                                 /* normal completion */
1787                 break;
1788         case -ENOENT:                   /* cancelled */
1789         case -ECONNRESET:               /* cancelled (async) */
1790         case -EINPROGRESS:              /* pending */
1791         case -ENODEV:                   /* device removed */
1792         case -ESHUTDOWN:                /* device shut down */
1793                 /* ignore silently */
1794                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1795                         __func__, get_usb_statmsg(status));
1796                 return;
1797         default:                                /* any failure */
1798                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1799                         dev_warn(cs->dev,
1800                                  "command write: %s, "
1801                                  "giving up after %d retries\n",
1802                                  get_usb_statmsg(status),
1803                                  ucs->retry_cmd_out);
1804                         break;
1805                 }
1806                 if (ucs->basstate & BS_SUSPEND) {
1807                         dev_warn(cs->dev,
1808                                  "command write: %s, "
1809                                  "won't retry - suspend requested\n",
1810                                  get_usb_statmsg(status));
1811                         break;
1812                 }
1813                 if (cs->cmdbuf == NULL) {
1814                         dev_warn(cs->dev,
1815                                  "command write: %s, "
1816                                  "cannot retry - cmdbuf gone\n",
1817                                  get_usb_statmsg(status));
1818                         break;
1819                 }
1820                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1821                            get_usb_statmsg(status), ucs->retry_cmd_out);
1822                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1823                         /* resubmitted - bypass regular exit block */
1824                         return;
1825                 /* command send failed, assume base still waiting */
1826                 update_basstate(ucs, BS_ATREADY, 0);
1827         }
1828 
1829         spin_lock_irqsave(&cs->cmdlock, flags);
1830         if (cs->cmdbuf != NULL)
1831                 complete_cb(cs);
1832         spin_unlock_irqrestore(&cs->cmdlock, flags);
1833 }
1834 
1835 /* atrdy_timeout
1836  * timeout routine for AT command transmission
1837  * argument:
1838  *      controller state structure
1839  */
1840 static void atrdy_timeout(unsigned long data)
1841 {
1842         struct cardstate *cs = (struct cardstate *) data;
1843         struct bas_cardstate *ucs = cs->hw.bas;
1844 
1845         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1846 
1847         /* fake the missing signal - what else can I do? */
1848         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1849         start_cbsend(cs);
1850 }
1851 
1852 /* atwrite_submit
1853  * submit an HD_WRITE_ATMESSAGE command URB
1854  * parameters:
1855  *      cs      controller state structure
1856  *      buf     buffer containing command to send
1857  *      len     length of command to send
1858  * return value:
1859  *      0 on success
1860  *      -EBUSY if another request is pending
1861  *      any URB submission error code
1862  */
1863 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1864 {
1865         struct bas_cardstate *ucs = cs->hw.bas;
1866         int rc;
1867 
1868         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1869 
1870         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1871                 dev_err(cs->dev,
1872                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1873                 return -EBUSY;
1874         }
1875 
1876         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1877         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1878         ucs->dr_cmd_out.wValue = 0;
1879         ucs->dr_cmd_out.wIndex = 0;
1880         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1881         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1882                              usb_sndctrlpipe(ucs->udev, 0),
1883                              (unsigned char *) &ucs->dr_cmd_out, buf, len,
1884                              write_command_callback, cs);
1885         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1886         if (unlikely(rc)) {
1887                 update_basstate(ucs, 0, BS_ATWRPEND);
1888                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1889                         get_usb_rcmsg(rc));
1890                 return rc;
1891         }
1892 
1893         /* submitted successfully, start timeout if necessary */
1894         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1895                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1896                         ATRDY_TIMEOUT);
1897                 mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
1898         }
1899         return 0;
1900 }
1901 
1902 /* start_cbsend
1903  * start transmission of AT command queue if necessary
1904  * parameter:
1905  *      cs              controller state structure
1906  * return value:
1907  *      0 on success
1908  *      error code < 0 on error
1909  */
1910 static int start_cbsend(struct cardstate *cs)
1911 {
1912         struct cmdbuf_t *cb;
1913         struct bas_cardstate *ucs = cs->hw.bas;
1914         unsigned long flags;
1915         int rc;
1916         int retval = 0;
1917 
1918         /* check if suspend requested */
1919         if (ucs->basstate & BS_SUSPEND) {
1920                 gig_dbg(DEBUG_OUTPUT, "suspending");
1921                 return -EHOSTUNREACH;
1922         }
1923 
1924         /* check if AT channel is open */
1925         if (!(ucs->basstate & BS_ATOPEN)) {
1926                 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1927                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1928                 if (rc < 0) {
1929                         /* flush command queue */
1930                         spin_lock_irqsave(&cs->cmdlock, flags);
1931                         while (cs->cmdbuf != NULL)
1932                                 complete_cb(cs);
1933                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1934                 }
1935                 return rc;
1936         }
1937 
1938         /* try to send first command in queue */
1939         spin_lock_irqsave(&cs->cmdlock, flags);
1940 
1941         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1942                 ucs->retry_cmd_out = 0;
1943                 rc = atwrite_submit(cs, cb->buf, cb->len);
1944                 if (unlikely(rc)) {
1945                         retval = rc;
1946                         complete_cb(cs);
1947                 }
1948         }
1949 
1950         spin_unlock_irqrestore(&cs->cmdlock, flags);
1951         return retval;
1952 }
1953 
1954 /* gigaset_write_cmd
1955  * This function is called by the device independent part of the driver
1956  * to transmit an AT command string to the Gigaset device.
1957  * It encapsulates the device specific method for transmission over the
1958  * direct USB connection to the base.
1959  * The command string is added to the queue of commands to send, and
1960  * USB transmission is started if necessary.
1961  * parameters:
1962  *      cs              controller state structure
1963  *      cb              command buffer structure
1964  * return value:
1965  *      number of bytes queued on success
1966  *      error code < 0 on error
1967  */
1968 static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
1969 {
1970         unsigned long flags;
1971         int rc;
1972 
1973         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1974                            DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1975                            "CMD Transmit", cb->len, cb->buf);
1976 
1977         /* translate "+++" escape sequence sent as a single separate command
1978          * into "close AT channel" command for error recovery
1979          * The next command will reopen the AT channel automatically.
1980          */
1981         if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
1982                 /* If an HD_RECEIVEATDATA_ACK message remains unhandled
1983                  * because of an error, the base never sends another one.
1984                  * The response channel is thus effectively blocked.
1985                  * Closing and reopening the AT channel does *not* clear
1986                  * this condition.
1987                  * As a stopgap measure, submit a zero-length AT read
1988                  * before closing the AT channel. This has the undocumented
1989                  * effect of triggering a new HD_RECEIVEATDATA_ACK message
1990                  * from the base if necessary.
1991                  * The subsequent AT channel close then discards any pending
1992                  * messages.
1993                  */
1994                 spin_lock_irqsave(&cs->lock, flags);
1995                 if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
1996                         kfree(cs->hw.bas->rcvbuf);
1997                         cs->hw.bas->rcvbuf = NULL;
1998                         cs->hw.bas->rcvbuf_size = 0;
1999                         cs->hw.bas->retry_cmd_in = 0;
2000                         atread_submit(cs, 0);
2001                 }
2002                 spin_unlock_irqrestore(&cs->lock, flags);
2003 
2004                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
2005                 if (cb->wake_tasklet)
2006                         tasklet_schedule(cb->wake_tasklet);
2007                 if (!rc)
2008                         rc = cb->len;
2009                 kfree(cb);
2010                 return rc;
2011         }
2012 
2013         spin_lock_irqsave(&cs->cmdlock, flags);
2014         cb->prev = cs->lastcmdbuf;
2015         if (cs->lastcmdbuf)
2016                 cs->lastcmdbuf->next = cb;
2017         else {
2018                 cs->cmdbuf = cb;
2019                 cs->curlen = cb->len;
2020         }
2021         cs->cmdbytes += cb->len;
2022         cs->lastcmdbuf = cb;
2023         spin_unlock_irqrestore(&cs->cmdlock, flags);
2024 
2025         spin_lock_irqsave(&cs->lock, flags);
2026         if (unlikely(!cs->connected)) {
2027                 spin_unlock_irqrestore(&cs->lock, flags);
2028                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
2029                 /* flush command queue */
2030                 spin_lock_irqsave(&cs->cmdlock, flags);
2031                 while (cs->cmdbuf != NULL)
2032                         complete_cb(cs);
2033                 spin_unlock_irqrestore(&cs->cmdlock, flags);
2034                 return -ENODEV;
2035         }
2036         rc = start_cbsend(cs);
2037         spin_unlock_irqrestore(&cs->lock, flags);
2038         return rc < 0 ? rc : cb->len;
2039 }
2040 
2041 /* gigaset_write_room
2042  * tty_driver.write_room interface routine
2043  * return number of characters the driver will accept to be written via
2044  * gigaset_write_cmd
2045  * parameter:
2046  *      controller state structure
2047  * return value:
2048  *      number of characters
2049  */
2050 static int gigaset_write_room(struct cardstate *cs)
2051 {
2052         return IF_WRITEBUF;
2053 }
2054 
2055 /* gigaset_chars_in_buffer
2056  * tty_driver.chars_in_buffer interface routine
2057  * return number of characters waiting to be sent
2058  * parameter:
2059  *      controller state structure
2060  * return value:
2061  *      number of characters
2062  */
2063 static int gigaset_chars_in_buffer(struct cardstate *cs)
2064 {
2065         return cs->cmdbytes;
2066 }
2067 
2068 /* gigaset_brkchars
2069  * implementation of ioctl(GIGASET_BRKCHARS)
2070  * parameter:
2071  *      controller state structure
2072  * return value:
2073  *      -EINVAL (unimplemented function)
2074  */
2075 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2076 {
2077         return -EINVAL;
2078 }
2079 
2080 
2081 /* Device Initialization/Shutdown */
2082 /* ============================== */
2083 
2084 /* Free hardware dependent part of the B channel structure
2085  * parameter:
2086  *      bcs     B channel structure
2087  */
2088 static void gigaset_freebcshw(struct bc_state *bcs)
2089 {
2090         struct bas_bc_state *ubc = bcs->hw.bas;
2091         int i;
2092 
2093         if (!ubc)
2094                 return;
2095 
2096         /* kill URBs and tasklets before freeing - better safe than sorry */
2097         ubc->running = 0;
2098         gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
2099         for (i = 0; i < BAS_OUTURBS; ++i) {
2100                 usb_kill_urb(ubc->isoouturbs[i].urb);
2101                 usb_free_urb(ubc->isoouturbs[i].urb);
2102         }
2103         for (i = 0; i < BAS_INURBS; ++i) {
2104                 usb_kill_urb(ubc->isoinurbs[i]);
2105                 usb_free_urb(ubc->isoinurbs[i]);
2106         }
2107         tasklet_kill(&ubc->sent_tasklet);
2108         tasklet_kill(&ubc->rcvd_tasklet);
2109         kfree(ubc->isooutbuf);
2110         kfree(ubc);
2111         bcs->hw.bas = NULL;
2112 }
2113 
2114 /* Initialize hardware dependent part of the B channel structure
2115  * parameter:
2116  *      bcs     B channel structure
2117  * return value:
2118  *      0 on success, error code < 0 on failure
2119  */
2120 static int gigaset_initbcshw(struct bc_state *bcs)
2121 {
2122         int i;
2123         struct bas_bc_state *ubc;
2124 
2125         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2126         if (!ubc) {
2127                 pr_err("out of memory\n");
2128                 return -ENOMEM;
2129         }
2130 
2131         ubc->running = 0;
2132         atomic_set(&ubc->corrbytes, 0);
2133         spin_lock_init(&ubc->isooutlock);
2134         for (i = 0; i < BAS_OUTURBS; ++i) {
2135                 ubc->isoouturbs[i].urb = NULL;
2136                 ubc->isoouturbs[i].bcs = bcs;
2137         }
2138         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2139         ubc->numsub = 0;
2140         ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2141         if (!ubc->isooutbuf) {
2142                 pr_err("out of memory\n");
2143                 kfree(ubc);
2144                 bcs->hw.bas = NULL;
2145                 return -ENOMEM;
2146         }
2147         tasklet_init(&ubc->sent_tasklet,
2148                      write_iso_tasklet, (unsigned long) bcs);
2149 
2150         spin_lock_init(&ubc->isoinlock);
2151         for (i = 0; i < BAS_INURBS; ++i)
2152                 ubc->isoinurbs[i] = NULL;
2153         ubc->isoindone = NULL;
2154         ubc->loststatus = -EINPROGRESS;
2155         ubc->isoinlost = 0;
2156         ubc->seqlen = 0;
2157         ubc->inbyte = 0;
2158         ubc->inbits = 0;
2159         ubc->goodbytes = 0;
2160         ubc->alignerrs = 0;
2161         ubc->fcserrs = 0;
2162         ubc->frameerrs = 0;
2163         ubc->giants = 0;
2164         ubc->runts = 0;
2165         ubc->aborts = 0;
2166         ubc->shared0s = 0;
2167         ubc->stolen0s = 0;
2168         tasklet_init(&ubc->rcvd_tasklet,
2169                      read_iso_tasklet, (unsigned long) bcs);
2170         return 0;
2171 }
2172 
2173 static void gigaset_reinitbcshw(struct bc_state *bcs)
2174 {
2175         struct bas_bc_state *ubc = bcs->hw.bas;
2176 
2177         bcs->hw.bas->running = 0;
2178         atomic_set(&bcs->hw.bas->corrbytes, 0);
2179         bcs->hw.bas->numsub = 0;
2180         spin_lock_init(&ubc->isooutlock);
2181         spin_lock_init(&ubc->isoinlock);
2182         ubc->loststatus = -EINPROGRESS;
2183 }
2184 
2185 static void gigaset_freecshw(struct cardstate *cs)
2186 {
2187         /* timers, URBs and rcvbuf are disposed of in disconnect */
2188         kfree(cs->hw.bas->int_in_buf);
2189         kfree(cs->hw.bas);
2190         cs->hw.bas = NULL;
2191 }
2192 
2193 /* Initialize hardware dependent part of the cardstate structure
2194  * parameter:
2195  *      cs      cardstate structure
2196  * return value:
2197  *      0 on success, error code < 0 on failure
2198  */
2199 static int gigaset_initcshw(struct cardstate *cs)
2200 {
2201         struct bas_cardstate *ucs;
2202 
2203         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2204         if (!ucs) {
2205                 pr_err("out of memory\n");
2206                 return -ENOMEM;
2207         }
2208         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2209         if (!ucs->int_in_buf) {
2210                 kfree(ucs);
2211                 pr_err("out of memory\n");
2212                 return -ENOMEM;
2213         }
2214 
2215         ucs->urb_cmd_in = NULL;
2216         ucs->urb_cmd_out = NULL;
2217         ucs->rcvbuf = NULL;
2218         ucs->rcvbuf_size = 0;
2219 
2220         spin_lock_init(&ucs->lock);
2221         ucs->pending = 0;
2222 
2223         ucs->basstate = 0;
2224         setup_timer(&ucs->timer_ctrl, req_timeout, (unsigned long) cs);
2225         setup_timer(&ucs->timer_atrdy, atrdy_timeout, (unsigned long) cs);
2226         setup_timer(&ucs->timer_cmd_in, cmd_in_timeout, (unsigned long) cs);
2227         setup_timer(&ucs->timer_int_in, int_in_resubmit, (unsigned long) cs);
2228         init_waitqueue_head(&ucs->waitqueue);
2229         INIT_WORK(&ucs->int_in_wq, int_in_work);
2230 
2231         return 0;
2232 }
2233 
2234 /* freeurbs
2235  * unlink and deallocate all URBs unconditionally
2236  * caller must make sure that no commands are still in progress
2237  * parameter:
2238  *      cs      controller state structure
2239  */
2240 static void freeurbs(struct cardstate *cs)
2241 {
2242         struct bas_cardstate *ucs = cs->hw.bas;
2243         struct bas_bc_state *ubc;
2244         int i, j;
2245 
2246         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2247         for (j = 0; j < BAS_CHANNELS; ++j) {
2248                 ubc = cs->bcs[j].hw.bas;
2249                 for (i = 0; i < BAS_OUTURBS; ++i) {
2250                         usb_kill_urb(ubc->isoouturbs[i].urb);
2251                         usb_free_urb(ubc->isoouturbs[i].urb);
2252                         ubc->isoouturbs[i].urb = NULL;
2253                 }
2254                 for (i = 0; i < BAS_INURBS; ++i) {
2255                         usb_kill_urb(ubc->isoinurbs[i]);
2256                         usb_free_urb(ubc->isoinurbs[i]);
2257                         ubc->isoinurbs[i] = NULL;
2258                 }
2259         }
2260         usb_kill_urb(ucs->urb_int_in);
2261         usb_free_urb(ucs->urb_int_in);
2262         ucs->urb_int_in = NULL;
2263         usb_kill_urb(ucs->urb_cmd_out);
2264         usb_free_urb(ucs->urb_cmd_out);
2265         ucs->urb_cmd_out = NULL;
2266         usb_kill_urb(ucs->urb_cmd_in);
2267         usb_free_urb(ucs->urb_cmd_in);
2268         ucs->urb_cmd_in = NULL;
2269         usb_kill_urb(ucs->urb_ctrl);
2270         usb_free_urb(ucs->urb_ctrl);
2271         ucs->urb_ctrl = NULL;
2272 }
2273 
2274 /* gigaset_probe
2275  * This function is called when a new USB device is connected.
2276  * It checks whether the new device is handled by this driver.
2277  */
2278 static int gigaset_probe(struct usb_interface *interface,
2279                          const struct usb_device_id *id)
2280 {
2281         struct usb_host_interface *hostif;
2282         struct usb_device *udev = interface_to_usbdev(interface);
2283         struct cardstate *cs = NULL;
2284         struct bas_cardstate *ucs = NULL;
2285         struct bas_bc_state *ubc;
2286         struct usb_endpoint_descriptor *endpoint;
2287         int i, j;
2288         int rc;
2289 
2290         gig_dbg(DEBUG_INIT,
2291                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2292                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2293                 le16_to_cpu(udev->descriptor.idProduct));
2294 
2295         /* set required alternate setting */
2296         hostif = interface->cur_altsetting;
2297         if (hostif->desc.bAlternateSetting != 3) {
2298                 gig_dbg(DEBUG_INIT,
2299                         "%s: wrong alternate setting %d - trying to switch",
2300                         __func__, hostif->desc.bAlternateSetting);
2301                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2302                     < 0) {
2303                         dev_warn(&udev->dev, "usb_set_interface failed, "
2304                                  "device %d interface %d altsetting %d\n",
2305                                  udev->devnum, hostif->desc.bInterfaceNumber,
2306                                  hostif->desc.bAlternateSetting);
2307                         return -ENODEV;
2308                 }
2309                 hostif = interface->cur_altsetting;
2310         }
2311 
2312         /* Reject application specific interfaces
2313          */
2314         if (hostif->desc.bInterfaceClass != 255) {
2315                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2316                          __func__, hostif->desc.bInterfaceClass);
2317                 return -ENODEV;
2318         }
2319 
2320         dev_info(&udev->dev,
2321                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2322                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2323                  le16_to_cpu(udev->descriptor.idProduct));
2324 
2325         /* allocate memory for our device state and initialize it */
2326         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2327                             GIGASET_MODULENAME);
2328         if (!cs)
2329                 return -ENODEV;
2330         ucs = cs->hw.bas;
2331 
2332         /* save off device structure ptrs for later use */
2333         usb_get_dev(udev);
2334         ucs->udev = udev;
2335         ucs->interface = interface;
2336         cs->dev = &interface->dev;
2337 
2338         /* allocate URBs:
2339          * - one for the interrupt pipe
2340          * - three for the different uses of the default control pipe
2341          * - three for each isochronous pipe
2342          */
2343         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2344             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2345             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2346             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2347                 goto allocerr;
2348 
2349         for (j = 0; j < BAS_CHANNELS; ++j) {
2350                 ubc = cs->bcs[j].hw.bas;
2351                 for (i = 0; i < BAS_OUTURBS; ++i)
2352                         if (!(ubc->isoouturbs[i].urb =
2353                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2354                                 goto allocerr;
2355                 for (i = 0; i < BAS_INURBS; ++i)
2356                         if (!(ubc->isoinurbs[i] =
2357                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2358                                 goto allocerr;
2359         }
2360 
2361         ucs->rcvbuf = NULL;
2362         ucs->rcvbuf_size = 0;
2363 
2364         /* Fill the interrupt urb and send it to the core */
2365         endpoint = &hostif->endpoint[0].desc;
2366         usb_fill_int_urb(ucs->urb_int_in, udev,
2367                          usb_rcvintpipe(udev,
2368                                         (endpoint->bEndpointAddress) & 0x0f),
2369                          ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2370                          endpoint->bInterval);
2371         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2372         if (rc != 0) {
2373                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2374                         get_usb_rcmsg(rc));
2375                 goto error;
2376         }
2377         ucs->retry_int_in = 0;
2378 
2379         /* tell the device that the driver is ready */
2380         rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2381         if (rc != 0)
2382                 goto error;
2383 
2384         /* tell common part that the device is ready */
2385         if (startmode == SM_LOCKED)
2386                 cs->mstate = MS_LOCKED;
2387 
2388         /* save address of controller structure */
2389         usb_set_intfdata(interface, cs);
2390 
2391         rc = gigaset_start(cs);
2392         if (rc < 0)
2393                 goto error;
2394 
2395         return 0;
2396 
2397 allocerr:
2398         dev_err(cs->dev, "could not allocate URBs\n");
2399         rc = -ENOMEM;
2400 error:
2401         freeurbs(cs);
2402         usb_set_intfdata(interface, NULL);
2403         gigaset_freecs(cs);
2404         return rc;
2405 }
2406 
2407 /* gigaset_disconnect
2408  * This function is called when the Gigaset base is unplugged.
2409  */
2410 static void gigaset_disconnect(struct usb_interface *interface)
2411 {
2412         struct cardstate *cs;
2413         struct bas_cardstate *ucs;
2414         int j;
2415 
2416         cs = usb_get_intfdata(interface);
2417 
2418         ucs = cs->hw.bas;
2419 
2420         dev_info(cs->dev, "disconnecting Gigaset base\n");
2421 
2422         /* mark base as not ready, all channels disconnected */
2423         ucs->basstate = 0;
2424 
2425         /* tell LL all channels are down */
2426         for (j = 0; j < BAS_CHANNELS; ++j)
2427                 gigaset_bchannel_down(cs->bcs + j);
2428 
2429         /* stop driver (common part) */
2430         gigaset_stop(cs);
2431 
2432         /* stop delayed work and URBs, free ressources */
2433         del_timer_sync(&ucs->timer_ctrl);
2434         del_timer_sync(&ucs->timer_atrdy);
2435         del_timer_sync(&ucs->timer_cmd_in);
2436         del_timer_sync(&ucs->timer_int_in);
2437         cancel_work_sync(&ucs->int_in_wq);
2438         freeurbs(cs);
2439         usb_set_intfdata(interface, NULL);
2440         kfree(ucs->rcvbuf);
2441         ucs->rcvbuf = NULL;
2442         ucs->rcvbuf_size = 0;
2443         usb_put_dev(ucs->udev);
2444         ucs->interface = NULL;
2445         ucs->udev = NULL;
2446         cs->dev = NULL;
2447         gigaset_freecs(cs);
2448 }
2449 
2450 /* gigaset_suspend
2451  * This function is called before the USB connection is suspended
2452  * or before the USB device is reset.
2453  * In the latter case, message == PMSG_ON.
2454  */
2455 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2456 {
2457         struct cardstate *cs = usb_get_intfdata(intf);
2458         struct bas_cardstate *ucs = cs->hw.bas;
2459         int rc;
2460 
2461         /* set suspend flag; this stops AT command/response traffic */
2462         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2463                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2464                 return 0;
2465         }
2466 
2467         /* wait a bit for blocking conditions to go away */
2468         rc = wait_event_timeout(ucs->waitqueue,
2469                                 !(ucs->basstate &
2470                                   (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)),
2471                                 BAS_TIMEOUT * HZ / 10);
2472         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2473 
2474         /* check for conditions preventing suspend */
2475         if (ucs->basstate & (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)) {
2476                 dev_warn(cs->dev, "cannot suspend:\n");
2477                 if (ucs->basstate & BS_B1OPEN)
2478                         dev_warn(cs->dev, " B channel 1 open\n");
2479                 if (ucs->basstate & BS_B2OPEN)
2480                         dev_warn(cs->dev, " B channel 2 open\n");
2481                 if (ucs->basstate & BS_ATRDPEND)
2482                         dev_warn(cs->dev, " receiving AT reply\n");
2483                 if (ucs->basstate & BS_ATWRPEND)
2484                         dev_warn(cs->dev, " sending AT command\n");
2485                 update_basstate(ucs, 0, BS_SUSPEND);
2486                 return -EBUSY;
2487         }
2488 
2489         /* close AT channel if open */
2490         if (ucs->basstate & BS_ATOPEN) {
2491                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2492                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2493                 if (rc) {
2494                         update_basstate(ucs, 0, BS_SUSPEND);
2495                         return rc;
2496                 }
2497                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2498                                    BAS_TIMEOUT * HZ / 10);
2499                 /* in case of timeout, proceed anyway */
2500         }
2501 
2502         /* kill all URBs and delayed work that might still be pending */
2503         usb_kill_urb(ucs->urb_ctrl);
2504         usb_kill_urb(ucs->urb_int_in);
2505         del_timer_sync(&ucs->timer_ctrl);
2506         del_timer_sync(&ucs->timer_atrdy);
2507         del_timer_sync(&ucs->timer_cmd_in);
2508         del_timer_sync(&ucs->timer_int_in);
2509 
2510         /* don't try to cancel int_in_wq from within reset as it
2511          * might be the one requesting the reset
2512          */
2513         if (message.event != PM_EVENT_ON)
2514                 cancel_work_sync(&ucs->int_in_wq);
2515 
2516         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2517         return 0;
2518 }
2519 
2520 /* gigaset_resume
2521  * This function is called after the USB connection has been resumed.
2522  */
2523 static int gigaset_resume(struct usb_interface *intf)
2524 {
2525         struct cardstate *cs = usb_get_intfdata(intf);
2526         struct bas_cardstate *ucs = cs->hw.bas;
2527         int rc;
2528 
2529         /* resubmit interrupt URB for spontaneous messages from base */
2530         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2531         if (rc) {
2532                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2533                         get_usb_rcmsg(rc));
2534                 return rc;
2535         }
2536         ucs->retry_int_in = 0;
2537 
2538         /* clear suspend flag to reallow activity */
2539         update_basstate(ucs, 0, BS_SUSPEND);
2540 
2541         gig_dbg(DEBUG_SUSPEND, "resume complete");
2542         return 0;
2543 }
2544 
2545 /* gigaset_pre_reset
2546  * This function is called before the USB connection is reset.
2547  */
2548 static int gigaset_pre_reset(struct usb_interface *intf)
2549 {
2550         /* handle just like suspend */
2551         return gigaset_suspend(intf, PMSG_ON);
2552 }
2553 
2554 /* gigaset_post_reset
2555  * This function is called after the USB connection has been reset.
2556  */
2557 static int gigaset_post_reset(struct usb_interface *intf)
2558 {
2559         /* FIXME: send HD_DEVICE_INIT_ACK? */
2560 
2561         /* resume operations */
2562         return gigaset_resume(intf);
2563 }
2564 
2565 
2566 static const struct gigaset_ops gigops = {
2567         gigaset_write_cmd,
2568         gigaset_write_room,
2569         gigaset_chars_in_buffer,
2570         gigaset_brkchars,
2571         gigaset_init_bchannel,
2572         gigaset_close_bchannel,
2573         gigaset_initbcshw,
2574         gigaset_freebcshw,
2575         gigaset_reinitbcshw,
2576         gigaset_initcshw,
2577         gigaset_freecshw,
2578         gigaset_set_modem_ctrl,
2579         gigaset_baud_rate,
2580         gigaset_set_line_ctrl,
2581         gigaset_isoc_send_skb,
2582         gigaset_isoc_input,
2583 };
2584 
2585 /* bas_gigaset_init
2586  * This function is called after the kernel module is loaded.
2587  */
2588 static int __init bas_gigaset_init(void)
2589 {
2590         int result;
2591 
2592         /* allocate memory for our driver state and initialize it */
2593         driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2594                                     GIGASET_MODULENAME, GIGASET_DEVNAME,
2595                                     &gigops, THIS_MODULE);
2596         if (driver == NULL)
2597                 goto error;
2598 
2599         /* register this driver with the USB subsystem */
2600         result = usb_register(&gigaset_usb_driver);
2601         if (result < 0) {
2602                 pr_err("error %d registering USB driver\n", -result);
2603                 goto error;
2604         }
2605 
2606         pr_info(DRIVER_DESC "\n");
2607         return 0;
2608 
2609 error:
2610         if (driver)
2611                 gigaset_freedriver(driver);
2612         driver = NULL;
2613         return -1;
2614 }
2615 
2616 /* bas_gigaset_exit
2617  * This function is called before the kernel module is unloaded.
2618  */
2619 static void __exit bas_gigaset_exit(void)
2620 {
2621         struct bas_cardstate *ucs;
2622         int i;
2623 
2624         gigaset_blockdriver(driver); /* => probe will fail
2625                                       * => no gigaset_start any more
2626                                       */
2627 
2628         /* stop all connected devices */
2629         for (i = 0; i < driver->minors; i++) {
2630                 if (gigaset_shutdown(driver->cs + i) < 0)
2631                         continue;               /* no device */
2632                 /* from now on, no isdn callback should be possible */
2633 
2634                 /* close all still open channels */
2635                 ucs = driver->cs[i].hw.bas;
2636                 if (ucs->basstate & BS_B1OPEN) {
2637                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2638                         usb_control_msg(ucs->udev,
2639                                         usb_sndctrlpipe(ucs->udev, 0),
2640                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2641                                         0, 0, NULL, 0, BAS_TIMEOUT);
2642                 }
2643                 if (ucs->basstate & BS_B2OPEN) {
2644                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2645                         usb_control_msg(ucs->udev,
2646                                         usb_sndctrlpipe(ucs->udev, 0),
2647                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2648                                         0, 0, NULL, 0, BAS_TIMEOUT);
2649                 }
2650                 if (ucs->basstate & BS_ATOPEN) {
2651                         gig_dbg(DEBUG_INIT, "closing AT channel");
2652                         usb_control_msg(ucs->udev,
2653                                         usb_sndctrlpipe(ucs->udev, 0),
2654                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2655                                         0, 0, NULL, 0, BAS_TIMEOUT);
2656                 }
2657                 ucs->basstate = 0;
2658         }
2659 
2660         /* deregister this driver with the USB subsystem */
2661         usb_deregister(&gigaset_usb_driver);
2662         /* this will call the disconnect-callback */
2663         /* from now on, no disconnect/probe callback should be running */
2664 
2665         gigaset_freedriver(driver);
2666         driver = NULL;
2667 }
2668 
2669 
2670 module_init(bas_gigaset_init);
2671 module_exit(bas_gigaset_exit);
2672 
2673 MODULE_AUTHOR(DRIVER_AUTHOR);
2674 MODULE_DESCRIPTION(DRIVER_DESC);
2675 MODULE_LICENSE("GPL");
2676 

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