1 /* 2 USB Driver layer for GSM modems 3 4 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de> 5 6 This driver is free software; you can redistribute it and/or modify 7 it under the terms of Version 2 of the GNU General Public License as 8 published by the Free Software Foundation. 9 10 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org> 11 12 History: see the git log. 13 14 Work sponsored by: Sigos GmbH, Germany <info@sigos.de> 15 16 This driver exists because the "normal" serial driver doesn't work too well 17 with GSM modems. Issues: 18 - data loss -- one single Receive URB is not nearly enough 19 - controlling the baud rate doesn't make sense 20 */ 21 22 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>" 23 #define DRIVER_DESC "USB Driver for GSM modems" 24 25 #include <linux/kernel.h> 26 #include <linux/jiffies.h> 27 #include <linux/errno.h> 28 #include <linux/slab.h> 29 #include <linux/tty.h> 30 #include <linux/tty_flip.h> 31 #include <linux/module.h> 32 #include <linux/bitops.h> 33 #include <linux/uaccess.h> 34 #include <linux/usb.h> 35 #include <linux/usb/serial.h> 36 #include <linux/serial.h> 37 #include "usb-wwan.h" 38 39 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on) 40 { 41 struct usb_wwan_port_private *portdata; 42 struct usb_wwan_intf_private *intfdata; 43 44 intfdata = usb_get_serial_data(port->serial); 45 46 if (!intfdata->send_setup) 47 return; 48 49 portdata = usb_get_serial_port_data(port); 50 /* FIXME: locking */ 51 portdata->rts_state = on; 52 portdata->dtr_state = on; 53 54 intfdata->send_setup(port); 55 } 56 EXPORT_SYMBOL(usb_wwan_dtr_rts); 57 58 int usb_wwan_tiocmget(struct tty_struct *tty) 59 { 60 struct usb_serial_port *port = tty->driver_data; 61 unsigned int value; 62 struct usb_wwan_port_private *portdata; 63 64 portdata = usb_get_serial_port_data(port); 65 66 value = ((portdata->rts_state) ? TIOCM_RTS : 0) | 67 ((portdata->dtr_state) ? TIOCM_DTR : 0) | 68 ((portdata->cts_state) ? TIOCM_CTS : 0) | 69 ((portdata->dsr_state) ? TIOCM_DSR : 0) | 70 ((portdata->dcd_state) ? TIOCM_CAR : 0) | 71 ((portdata->ri_state) ? TIOCM_RNG : 0); 72 73 return value; 74 } 75 EXPORT_SYMBOL(usb_wwan_tiocmget); 76 77 int usb_wwan_tiocmset(struct tty_struct *tty, 78 unsigned int set, unsigned int clear) 79 { 80 struct usb_serial_port *port = tty->driver_data; 81 struct usb_wwan_port_private *portdata; 82 struct usb_wwan_intf_private *intfdata; 83 84 portdata = usb_get_serial_port_data(port); 85 intfdata = usb_get_serial_data(port->serial); 86 87 if (!intfdata->send_setup) 88 return -EINVAL; 89 90 /* FIXME: what locks portdata fields ? */ 91 if (set & TIOCM_RTS) 92 portdata->rts_state = 1; 93 if (set & TIOCM_DTR) 94 portdata->dtr_state = 1; 95 96 if (clear & TIOCM_RTS) 97 portdata->rts_state = 0; 98 if (clear & TIOCM_DTR) 99 portdata->dtr_state = 0; 100 return intfdata->send_setup(port); 101 } 102 EXPORT_SYMBOL(usb_wwan_tiocmset); 103 104 static int get_serial_info(struct usb_serial_port *port, 105 struct serial_struct __user *retinfo) 106 { 107 struct serial_struct tmp; 108 109 if (!retinfo) 110 return -EFAULT; 111 112 memset(&tmp, 0, sizeof(tmp)); 113 tmp.line = port->minor; 114 tmp.port = port->port_number; 115 tmp.baud_base = tty_get_baud_rate(port->port.tty); 116 tmp.close_delay = port->port.close_delay / 10; 117 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ? 118 ASYNC_CLOSING_WAIT_NONE : 119 port->port.closing_wait / 10; 120 121 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 122 return -EFAULT; 123 return 0; 124 } 125 126 static int set_serial_info(struct usb_serial_port *port, 127 struct serial_struct __user *newinfo) 128 { 129 struct serial_struct new_serial; 130 unsigned int closing_wait, close_delay; 131 int retval = 0; 132 133 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 134 return -EFAULT; 135 136 close_delay = new_serial.close_delay * 10; 137 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? 138 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; 139 140 mutex_lock(&port->port.mutex); 141 142 if (!capable(CAP_SYS_ADMIN)) { 143 if ((close_delay != port->port.close_delay) || 144 (closing_wait != port->port.closing_wait)) 145 retval = -EPERM; 146 else 147 retval = -EOPNOTSUPP; 148 } else { 149 port->port.close_delay = close_delay; 150 port->port.closing_wait = closing_wait; 151 } 152 153 mutex_unlock(&port->port.mutex); 154 return retval; 155 } 156 157 int usb_wwan_ioctl(struct tty_struct *tty, 158 unsigned int cmd, unsigned long arg) 159 { 160 struct usb_serial_port *port = tty->driver_data; 161 162 dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd); 163 164 switch (cmd) { 165 case TIOCGSERIAL: 166 return get_serial_info(port, 167 (struct serial_struct __user *) arg); 168 case TIOCSSERIAL: 169 return set_serial_info(port, 170 (struct serial_struct __user *) arg); 171 default: 172 break; 173 } 174 175 dev_dbg(&port->dev, "%s arg not supported\n", __func__); 176 177 return -ENOIOCTLCMD; 178 } 179 EXPORT_SYMBOL(usb_wwan_ioctl); 180 181 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port, 182 const unsigned char *buf, int count) 183 { 184 struct usb_wwan_port_private *portdata; 185 struct usb_wwan_intf_private *intfdata; 186 int i; 187 int left, todo; 188 struct urb *this_urb = NULL; /* spurious */ 189 int err; 190 unsigned long flags; 191 192 portdata = usb_get_serial_port_data(port); 193 intfdata = usb_get_serial_data(port->serial); 194 195 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count); 196 197 i = 0; 198 left = count; 199 for (i = 0; left > 0 && i < N_OUT_URB; i++) { 200 todo = left; 201 if (todo > OUT_BUFLEN) 202 todo = OUT_BUFLEN; 203 204 this_urb = portdata->out_urbs[i]; 205 if (test_and_set_bit(i, &portdata->out_busy)) { 206 if (time_before(jiffies, 207 portdata->tx_start_time[i] + 10 * HZ)) 208 continue; 209 usb_unlink_urb(this_urb); 210 continue; 211 } 212 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__, 213 usb_pipeendpoint(this_urb->pipe), i); 214 215 err = usb_autopm_get_interface_async(port->serial->interface); 216 if (err < 0) { 217 clear_bit(i, &portdata->out_busy); 218 break; 219 } 220 221 /* send the data */ 222 memcpy(this_urb->transfer_buffer, buf, todo); 223 this_urb->transfer_buffer_length = todo; 224 225 spin_lock_irqsave(&intfdata->susp_lock, flags); 226 if (intfdata->suspended) { 227 usb_anchor_urb(this_urb, &portdata->delayed); 228 spin_unlock_irqrestore(&intfdata->susp_lock, flags); 229 } else { 230 intfdata->in_flight++; 231 spin_unlock_irqrestore(&intfdata->susp_lock, flags); 232 err = usb_submit_urb(this_urb, GFP_ATOMIC); 233 if (err) { 234 dev_err(&port->dev, 235 "%s: submit urb %d failed: %d\n", 236 __func__, i, err); 237 clear_bit(i, &portdata->out_busy); 238 spin_lock_irqsave(&intfdata->susp_lock, flags); 239 intfdata->in_flight--; 240 spin_unlock_irqrestore(&intfdata->susp_lock, 241 flags); 242 usb_autopm_put_interface_async(port->serial->interface); 243 break; 244 } 245 } 246 247 portdata->tx_start_time[i] = jiffies; 248 buf += todo; 249 left -= todo; 250 } 251 252 count -= left; 253 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count); 254 return count; 255 } 256 EXPORT_SYMBOL(usb_wwan_write); 257 258 static void usb_wwan_indat_callback(struct urb *urb) 259 { 260 int err; 261 int endpoint; 262 struct usb_serial_port *port; 263 struct device *dev; 264 unsigned char *data = urb->transfer_buffer; 265 int status = urb->status; 266 267 endpoint = usb_pipeendpoint(urb->pipe); 268 port = urb->context; 269 dev = &port->dev; 270 271 if (status) { 272 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n", 273 __func__, status, endpoint); 274 } else { 275 if (urb->actual_length) { 276 tty_insert_flip_string(&port->port, data, 277 urb->actual_length); 278 tty_flip_buffer_push(&port->port); 279 } else 280 dev_dbg(dev, "%s: empty read urb received\n", __func__); 281 } 282 /* Resubmit urb so we continue receiving */ 283 err = usb_submit_urb(urb, GFP_ATOMIC); 284 if (err) { 285 if (err != -EPERM) { 286 dev_err(dev, "%s: resubmit read urb failed. (%d)\n", 287 __func__, err); 288 /* busy also in error unless we are killed */ 289 usb_mark_last_busy(port->serial->dev); 290 } 291 } else { 292 usb_mark_last_busy(port->serial->dev); 293 } 294 } 295 296 static void usb_wwan_outdat_callback(struct urb *urb) 297 { 298 struct usb_serial_port *port; 299 struct usb_wwan_port_private *portdata; 300 struct usb_wwan_intf_private *intfdata; 301 int i; 302 303 port = urb->context; 304 intfdata = usb_get_serial_data(port->serial); 305 306 usb_serial_port_softint(port); 307 usb_autopm_put_interface_async(port->serial->interface); 308 portdata = usb_get_serial_port_data(port); 309 spin_lock(&intfdata->susp_lock); 310 intfdata->in_flight--; 311 spin_unlock(&intfdata->susp_lock); 312 313 for (i = 0; i < N_OUT_URB; ++i) { 314 if (portdata->out_urbs[i] == urb) { 315 smp_mb__before_atomic(); 316 clear_bit(i, &portdata->out_busy); 317 break; 318 } 319 } 320 } 321 322 int usb_wwan_write_room(struct tty_struct *tty) 323 { 324 struct usb_serial_port *port = tty->driver_data; 325 struct usb_wwan_port_private *portdata; 326 int i; 327 int data_len = 0; 328 struct urb *this_urb; 329 330 portdata = usb_get_serial_port_data(port); 331 332 for (i = 0; i < N_OUT_URB; i++) { 333 this_urb = portdata->out_urbs[i]; 334 if (this_urb && !test_bit(i, &portdata->out_busy)) 335 data_len += OUT_BUFLEN; 336 } 337 338 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len); 339 return data_len; 340 } 341 EXPORT_SYMBOL(usb_wwan_write_room); 342 343 int usb_wwan_chars_in_buffer(struct tty_struct *tty) 344 { 345 struct usb_serial_port *port = tty->driver_data; 346 struct usb_wwan_port_private *portdata; 347 int i; 348 int data_len = 0; 349 struct urb *this_urb; 350 351 portdata = usb_get_serial_port_data(port); 352 353 for (i = 0; i < N_OUT_URB; i++) { 354 this_urb = portdata->out_urbs[i]; 355 /* FIXME: This locking is insufficient as this_urb may 356 go unused during the test */ 357 if (this_urb && test_bit(i, &portdata->out_busy)) 358 data_len += this_urb->transfer_buffer_length; 359 } 360 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len); 361 return data_len; 362 } 363 EXPORT_SYMBOL(usb_wwan_chars_in_buffer); 364 365 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port) 366 { 367 struct usb_wwan_port_private *portdata; 368 struct usb_wwan_intf_private *intfdata; 369 struct usb_serial *serial = port->serial; 370 int i, err; 371 struct urb *urb; 372 373 portdata = usb_get_serial_port_data(port); 374 intfdata = usb_get_serial_data(serial); 375 376 if (port->interrupt_in_urb) { 377 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 378 if (err) { 379 dev_err(&port->dev, "%s: submit int urb failed: %d\n", 380 __func__, err); 381 } 382 } 383 384 /* Start reading from the IN endpoint */ 385 for (i = 0; i < N_IN_URB; i++) { 386 urb = portdata->in_urbs[i]; 387 if (!urb) 388 continue; 389 err = usb_submit_urb(urb, GFP_KERNEL); 390 if (err) { 391 dev_err(&port->dev, 392 "%s: submit read urb %d failed: %d\n", 393 __func__, i, err); 394 } 395 } 396 397 spin_lock_irq(&intfdata->susp_lock); 398 if (++intfdata->open_ports == 1) 399 serial->interface->needs_remote_wakeup = 1; 400 spin_unlock_irq(&intfdata->susp_lock); 401 /* this balances a get in the generic USB serial code */ 402 usb_autopm_put_interface(serial->interface); 403 404 return 0; 405 } 406 EXPORT_SYMBOL(usb_wwan_open); 407 408 static void unbusy_queued_urb(struct urb *urb, 409 struct usb_wwan_port_private *portdata) 410 { 411 int i; 412 413 for (i = 0; i < N_OUT_URB; i++) { 414 if (urb == portdata->out_urbs[i]) { 415 clear_bit(i, &portdata->out_busy); 416 break; 417 } 418 } 419 } 420 421 void usb_wwan_close(struct usb_serial_port *port) 422 { 423 int i; 424 struct usb_serial *serial = port->serial; 425 struct usb_wwan_port_private *portdata; 426 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial); 427 struct urb *urb; 428 429 portdata = usb_get_serial_port_data(port); 430 431 /* 432 * Need to take susp_lock to make sure port is not already being 433 * resumed, but no need to hold it due to ASYNC_INITIALIZED. 434 */ 435 spin_lock_irq(&intfdata->susp_lock); 436 if (--intfdata->open_ports == 0) 437 serial->interface->needs_remote_wakeup = 0; 438 spin_unlock_irq(&intfdata->susp_lock); 439 440 for (;;) { 441 urb = usb_get_from_anchor(&portdata->delayed); 442 if (!urb) 443 break; 444 unbusy_queued_urb(urb, portdata); 445 usb_autopm_put_interface_async(serial->interface); 446 } 447 448 for (i = 0; i < N_IN_URB; i++) 449 usb_kill_urb(portdata->in_urbs[i]); 450 for (i = 0; i < N_OUT_URB; i++) 451 usb_kill_urb(portdata->out_urbs[i]); 452 usb_kill_urb(port->interrupt_in_urb); 453 454 usb_autopm_get_interface_no_resume(serial->interface); 455 } 456 EXPORT_SYMBOL(usb_wwan_close); 457 458 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port, 459 int endpoint, 460 int dir, void *ctx, char *buf, int len, 461 void (*callback) (struct urb *)) 462 { 463 struct usb_serial *serial = port->serial; 464 struct urb *urb; 465 466 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */ 467 if (!urb) 468 return NULL; 469 470 usb_fill_bulk_urb(urb, serial->dev, 471 usb_sndbulkpipe(serial->dev, endpoint) | dir, 472 buf, len, callback, ctx); 473 474 return urb; 475 } 476 477 int usb_wwan_port_probe(struct usb_serial_port *port) 478 { 479 struct usb_wwan_port_private *portdata; 480 struct urb *urb; 481 u8 *buffer; 482 int i; 483 484 if (!port->bulk_in_size || !port->bulk_out_size) 485 return -ENODEV; 486 487 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL); 488 if (!portdata) 489 return -ENOMEM; 490 491 init_usb_anchor(&portdata->delayed); 492 493 for (i = 0; i < N_IN_URB; i++) { 494 buffer = (u8 *)__get_free_page(GFP_KERNEL); 495 if (!buffer) 496 goto bail_out_error; 497 portdata->in_buffer[i] = buffer; 498 499 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress, 500 USB_DIR_IN, port, 501 buffer, IN_BUFLEN, 502 usb_wwan_indat_callback); 503 portdata->in_urbs[i] = urb; 504 } 505 506 for (i = 0; i < N_OUT_URB; i++) { 507 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL); 508 if (!buffer) 509 goto bail_out_error2; 510 portdata->out_buffer[i] = buffer; 511 512 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress, 513 USB_DIR_OUT, port, 514 buffer, OUT_BUFLEN, 515 usb_wwan_outdat_callback); 516 portdata->out_urbs[i] = urb; 517 } 518 519 usb_set_serial_port_data(port, portdata); 520 521 return 0; 522 523 bail_out_error2: 524 for (i = 0; i < N_OUT_URB; i++) { 525 usb_free_urb(portdata->out_urbs[i]); 526 kfree(portdata->out_buffer[i]); 527 } 528 bail_out_error: 529 for (i = 0; i < N_IN_URB; i++) { 530 usb_free_urb(portdata->in_urbs[i]); 531 free_page((unsigned long)portdata->in_buffer[i]); 532 } 533 kfree(portdata); 534 535 return -ENOMEM; 536 } 537 EXPORT_SYMBOL_GPL(usb_wwan_port_probe); 538 539 int usb_wwan_port_remove(struct usb_serial_port *port) 540 { 541 int i; 542 struct usb_wwan_port_private *portdata; 543 544 portdata = usb_get_serial_port_data(port); 545 usb_set_serial_port_data(port, NULL); 546 547 for (i = 0; i < N_IN_URB; i++) { 548 usb_free_urb(portdata->in_urbs[i]); 549 free_page((unsigned long)portdata->in_buffer[i]); 550 } 551 for (i = 0; i < N_OUT_URB; i++) { 552 usb_free_urb(portdata->out_urbs[i]); 553 kfree(portdata->out_buffer[i]); 554 } 555 556 kfree(portdata); 557 558 return 0; 559 } 560 EXPORT_SYMBOL(usb_wwan_port_remove); 561 562 #ifdef CONFIG_PM 563 static void stop_urbs(struct usb_serial *serial) 564 { 565 int i, j; 566 struct usb_serial_port *port; 567 struct usb_wwan_port_private *portdata; 568 569 for (i = 0; i < serial->num_ports; ++i) { 570 port = serial->port[i]; 571 portdata = usb_get_serial_port_data(port); 572 if (!portdata) 573 continue; 574 for (j = 0; j < N_IN_URB; j++) 575 usb_kill_urb(portdata->in_urbs[j]); 576 for (j = 0; j < N_OUT_URB; j++) 577 usb_kill_urb(portdata->out_urbs[j]); 578 usb_kill_urb(port->interrupt_in_urb); 579 } 580 } 581 582 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message) 583 { 584 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial); 585 586 spin_lock_irq(&intfdata->susp_lock); 587 if (PMSG_IS_AUTO(message)) { 588 if (intfdata->in_flight) { 589 spin_unlock_irq(&intfdata->susp_lock); 590 return -EBUSY; 591 } 592 } 593 intfdata->suspended = 1; 594 spin_unlock_irq(&intfdata->susp_lock); 595 596 stop_urbs(serial); 597 598 return 0; 599 } 600 EXPORT_SYMBOL(usb_wwan_suspend); 601 602 /* Caller must hold susp_lock. */ 603 static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port) 604 { 605 struct usb_serial *serial = port->serial; 606 struct usb_wwan_intf_private *data = usb_get_serial_data(serial); 607 struct usb_wwan_port_private *portdata; 608 struct urb *urb; 609 int err_count = 0; 610 int err; 611 612 portdata = usb_get_serial_port_data(port); 613 614 for (;;) { 615 urb = usb_get_from_anchor(&portdata->delayed); 616 if (!urb) 617 break; 618 619 err = usb_submit_urb(urb, GFP_ATOMIC); 620 if (err) { 621 dev_err(&port->dev, "%s: submit urb failed: %d\n", 622 __func__, err); 623 err_count++; 624 unbusy_queued_urb(urb, portdata); 625 usb_autopm_put_interface_async(serial->interface); 626 continue; 627 } 628 data->in_flight++; 629 } 630 631 if (err_count) 632 return -EIO; 633 634 return 0; 635 } 636 637 int usb_wwan_resume(struct usb_serial *serial) 638 { 639 int i, j; 640 struct usb_serial_port *port; 641 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial); 642 struct usb_wwan_port_private *portdata; 643 struct urb *urb; 644 int err; 645 int err_count = 0; 646 647 spin_lock_irq(&intfdata->susp_lock); 648 for (i = 0; i < serial->num_ports; i++) { 649 port = serial->port[i]; 650 651 if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) 652 continue; 653 654 portdata = usb_get_serial_port_data(port); 655 656 if (port->interrupt_in_urb) { 657 err = usb_submit_urb(port->interrupt_in_urb, 658 GFP_ATOMIC); 659 if (err) { 660 dev_err(&port->dev, 661 "%s: submit int urb failed: %d\n", 662 __func__, err); 663 err_count++; 664 } 665 } 666 667 err = usb_wwan_submit_delayed_urbs(port); 668 if (err) 669 err_count++; 670 671 for (j = 0; j < N_IN_URB; j++) { 672 urb = portdata->in_urbs[j]; 673 err = usb_submit_urb(urb, GFP_ATOMIC); 674 if (err < 0) { 675 dev_err(&port->dev, 676 "%s: submit read urb %d failed: %d\n", 677 __func__, i, err); 678 err_count++; 679 } 680 } 681 } 682 intfdata->suspended = 0; 683 spin_unlock_irq(&intfdata->susp_lock); 684 685 if (err_count) 686 return -EIO; 687 688 return 0; 689 } 690 EXPORT_SYMBOL(usb_wwan_resume); 691 #endif 692 693 MODULE_AUTHOR(DRIVER_AUTHOR); 694 MODULE_DESCRIPTION(DRIVER_DESC); 695 MODULE_LICENSE("GPL"); 696