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