1 /* 2 * USB ConnectTech WhiteHEAT driver 3 * 4 * Copyright (C) 2002 5 * Connect Tech Inc. 6 * 7 * Copyright (C) 1999 - 2001 8 * Greg Kroah-Hartman (greg@kroah.com) 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * See Documentation/usb/usb-serial.txt for more information on using this driver 16 * 17 * (10/09/2002) Stuart MacDonald (stuartm@connecttech.com) 18 * Upgrade to full working driver 19 * 20 * (05/30/2001) gkh 21 * switched from using spinlock to a semaphore, which fixes lots of problems. 22 * 23 * (04/08/2001) gb 24 * Identify version on module load. 25 * 26 * 2001_Mar_19 gkh 27 * Fixed MOD_INC and MOD_DEC logic, the ability to open a port more 28 * than once, and the got the proper usb_device_id table entries so 29 * the driver works again. 30 * 31 * (11/01/2000) Adam J. Richter 32 * usb_device_id table support 33 * 34 * (10/05/2000) gkh 35 * Fixed bug with urb->dev not being set properly, now that the usb 36 * core needs it. 37 * 38 * (10/03/2000) smd 39 * firmware is improved to guard against crap sent to device 40 * firmware now replies CMD_FAILURE on bad things 41 * read_callback fix you provided for private info struct 42 * command_finished now indicates success or fail 43 * setup_port struct now packed to avoid gcc padding 44 * firmware uses 1 based port numbering, driver now handles that 45 * 46 * (09/11/2000) gkh 47 * Removed DEBUG #ifdefs with call to usb_serial_debug_data 48 * 49 * (07/19/2000) gkh 50 * Added module_init and module_exit functions to handle the fact that this 51 * driver is a loadable module now. 52 * Fixed bug with port->minor that was found by Al Borchers 53 * 54 * (07/04/2000) gkh 55 * Added support for port settings. Baud rate can now be changed. Line signals 56 * are not transferred to and from the tty layer yet, but things seem to be 57 * working well now. 58 * 59 * (05/04/2000) gkh 60 * First cut at open and close commands. Data can flow through the ports at 61 * default speeds now. 62 * 63 * (03/26/2000) gkh 64 * Split driver up into device specific pieces. 65 * 66 */ 67 68 #include <linux/kernel.h> 69 #include <linux/errno.h> 70 #include <linux/init.h> 71 #include <linux/slab.h> 72 #include <linux/tty.h> 73 #include <linux/tty_driver.h> 74 #include <linux/tty_flip.h> 75 #include <linux/module.h> 76 #include <linux/spinlock.h> 77 #include <linux/mutex.h> 78 #include <asm/uaccess.h> 79 #include <asm/termbits.h> 80 #include <linux/usb.h> 81 #include <linux/serial_reg.h> 82 #include <linux/serial.h> 83 #include <linux/usb/serial.h> 84 #include "whiteheat_fw.h" /* firmware for the ConnectTech WhiteHEAT device */ 85 #include "whiteheat.h" /* WhiteHEAT specific commands */ 86 87 static int debug; 88 89 #ifndef CMSPAR 90 #define CMSPAR 0 91 #endif 92 93 /* 94 * Version Information 95 */ 96 #define DRIVER_VERSION "v2.0" 97 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Stuart MacDonald <stuartm@connecttech.com>" 98 #define DRIVER_DESC "USB ConnectTech WhiteHEAT driver" 99 100 #define CONNECT_TECH_VENDOR_ID 0x0710 101 #define CONNECT_TECH_FAKE_WHITE_HEAT_ID 0x0001 102 #define CONNECT_TECH_WHITE_HEAT_ID 0x8001 103 104 /* 105 ID tables for whiteheat are unusual, because we want to different 106 things for different versions of the device. Eventually, this 107 will be doable from a single table. But, for now, we define two 108 separate ID tables, and then a third table that combines them 109 just for the purpose of exporting the autoloading information. 110 */ 111 static struct usb_device_id id_table_std [] = { 112 { USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) }, 113 { } /* Terminating entry */ 114 }; 115 116 static struct usb_device_id id_table_prerenumeration [] = { 117 { USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) }, 118 { } /* Terminating entry */ 119 }; 120 121 static struct usb_device_id id_table_combined [] = { 122 { USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) }, 123 { USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) }, 124 { } /* Terminating entry */ 125 }; 126 127 MODULE_DEVICE_TABLE (usb, id_table_combined); 128 129 static struct usb_driver whiteheat_driver = { 130 .name = "whiteheat", 131 .probe = usb_serial_probe, 132 .disconnect = usb_serial_disconnect, 133 .id_table = id_table_combined, 134 .no_dynamic_id = 1, 135 }; 136 137 /* function prototypes for the Connect Tech WhiteHEAT prerenumeration device */ 138 static int whiteheat_firmware_download (struct usb_serial *serial, const struct usb_device_id *id); 139 static int whiteheat_firmware_attach (struct usb_serial *serial); 140 141 /* function prototypes for the Connect Tech WhiteHEAT serial converter */ 142 static int whiteheat_attach (struct usb_serial *serial); 143 static void whiteheat_shutdown (struct usb_serial *serial); 144 static int whiteheat_open (struct usb_serial_port *port, struct file *filp); 145 static void whiteheat_close (struct usb_serial_port *port, struct file *filp); 146 static int whiteheat_write (struct usb_serial_port *port, const unsigned char *buf, int count); 147 static int whiteheat_write_room (struct usb_serial_port *port); 148 static int whiteheat_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg); 149 static void whiteheat_set_termios (struct usb_serial_port *port, struct ktermios * old); 150 static int whiteheat_tiocmget (struct usb_serial_port *port, struct file *file); 151 static int whiteheat_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear); 152 static void whiteheat_break_ctl (struct usb_serial_port *port, int break_state); 153 static int whiteheat_chars_in_buffer (struct usb_serial_port *port); 154 static void whiteheat_throttle (struct usb_serial_port *port); 155 static void whiteheat_unthrottle (struct usb_serial_port *port); 156 static void whiteheat_read_callback (struct urb *urb); 157 static void whiteheat_write_callback (struct urb *urb); 158 159 static struct usb_serial_driver whiteheat_fake_device = { 160 .driver = { 161 .owner = THIS_MODULE, 162 .name = "whiteheatnofirm", 163 }, 164 .description = "Connect Tech - WhiteHEAT - (prerenumeration)", 165 .usb_driver = &whiteheat_driver, 166 .id_table = id_table_prerenumeration, 167 .num_ports = 1, 168 .probe = whiteheat_firmware_download, 169 .attach = whiteheat_firmware_attach, 170 }; 171 172 static struct usb_serial_driver whiteheat_device = { 173 .driver = { 174 .owner = THIS_MODULE, 175 .name = "whiteheat", 176 }, 177 .description = "Connect Tech - WhiteHEAT", 178 .usb_driver = &whiteheat_driver, 179 .id_table = id_table_std, 180 .num_ports = 4, 181 .attach = whiteheat_attach, 182 .shutdown = whiteheat_shutdown, 183 .open = whiteheat_open, 184 .close = whiteheat_close, 185 .write = whiteheat_write, 186 .write_room = whiteheat_write_room, 187 .ioctl = whiteheat_ioctl, 188 .set_termios = whiteheat_set_termios, 189 .break_ctl = whiteheat_break_ctl, 190 .tiocmget = whiteheat_tiocmget, 191 .tiocmset = whiteheat_tiocmset, 192 .chars_in_buffer = whiteheat_chars_in_buffer, 193 .throttle = whiteheat_throttle, 194 .unthrottle = whiteheat_unthrottle, 195 .read_bulk_callback = whiteheat_read_callback, 196 .write_bulk_callback = whiteheat_write_callback, 197 }; 198 199 200 struct whiteheat_command_private { 201 struct mutex mutex; 202 __u8 port_running; 203 __u8 command_finished; 204 wait_queue_head_t wait_command; /* for handling sleeping while waiting for a command to finish */ 205 __u8 result_buffer[64]; 206 }; 207 208 209 #define THROTTLED 0x01 210 #define ACTUALLY_THROTTLED 0x02 211 212 static int urb_pool_size = 8; 213 214 struct whiteheat_urb_wrap { 215 struct list_head list; 216 struct urb *urb; 217 }; 218 219 struct whiteheat_private { 220 spinlock_t lock; 221 __u8 flags; 222 __u8 mcr; /* FIXME: no locking on mcr */ 223 struct list_head rx_urbs_free; 224 struct list_head rx_urbs_submitted; 225 struct list_head rx_urb_q; 226 struct work_struct rx_work; 227 struct usb_serial_port *port; 228 struct list_head tx_urbs_free; 229 struct list_head tx_urbs_submitted; 230 struct mutex deathwarrant; 231 }; 232 233 234 /* local function prototypes */ 235 static int start_command_port(struct usb_serial *serial); 236 static void stop_command_port(struct usb_serial *serial); 237 static void command_port_write_callback(struct urb *urb); 238 static void command_port_read_callback(struct urb *urb); 239 240 static int start_port_read(struct usb_serial_port *port); 241 static struct whiteheat_urb_wrap *urb_to_wrap(struct urb *urb, struct list_head *head); 242 static struct list_head *list_first(struct list_head *head); 243 static void rx_data_softint(struct work_struct *work); 244 245 static int firm_send_command(struct usb_serial_port *port, __u8 command, __u8 *data, __u8 datasize); 246 static int firm_open(struct usb_serial_port *port); 247 static int firm_close(struct usb_serial_port *port); 248 static int firm_setup_port(struct usb_serial_port *port); 249 static int firm_set_rts(struct usb_serial_port *port, __u8 onoff); 250 static int firm_set_dtr(struct usb_serial_port *port, __u8 onoff); 251 static int firm_set_break(struct usb_serial_port *port, __u8 onoff); 252 static int firm_purge(struct usb_serial_port *port, __u8 rxtx); 253 static int firm_get_dtr_rts(struct usb_serial_port *port); 254 static int firm_report_tx_done(struct usb_serial_port *port); 255 256 257 #define COMMAND_PORT 4 258 #define COMMAND_TIMEOUT (2*HZ) /* 2 second timeout for a command */ 259 #define COMMAND_TIMEOUT_MS 2000 260 #define CLOSING_DELAY (30 * HZ) 261 262 263 /***************************************************************************** 264 * Connect Tech's White Heat prerenumeration driver functions 265 *****************************************************************************/ 266 267 /* steps to download the firmware to the WhiteHEAT device: 268 - hold the reset (by writing to the reset bit of the CPUCS register) 269 - download the VEND_AX.HEX file to the chip using VENDOR_REQUEST-ANCHOR_LOAD 270 - release the reset (by writing to the CPUCS register) 271 - download the WH.HEX file for all addresses greater than 0x1b3f using 272 VENDOR_REQUEST-ANCHOR_EXTERNAL_RAM_LOAD 273 - hold the reset 274 - download the WH.HEX file for all addresses less than 0x1b40 using 275 VENDOR_REQUEST_ANCHOR_LOAD 276 - release the reset 277 - device renumerated itself and comes up as new device id with all 278 firmware download completed. 279 */ 280 static int whiteheat_firmware_download (struct usb_serial *serial, const struct usb_device_id *id) 281 { 282 int response; 283 const struct whiteheat_hex_record *record; 284 285 dbg("%s", __func__); 286 287 response = ezusb_set_reset (serial, 1); 288 289 record = &whiteheat_loader[0]; 290 while (record->address != 0xffff) { 291 response = ezusb_writememory (serial, record->address, 292 (unsigned char *)record->data, record->data_size, 0xa0); 293 if (response < 0) { 294 err("%s - ezusb_writememory failed for loader (%d %04X %p %d)", 295 __func__, response, record->address, record->data, record->data_size); 296 break; 297 } 298 ++record; 299 } 300 301 response = ezusb_set_reset (serial, 0); 302 303 record = &whiteheat_firmware[0]; 304 while (record->address < 0x1b40) { 305 ++record; 306 } 307 while (record->address != 0xffff) { 308 response = ezusb_writememory (serial, record->address, 309 (unsigned char *)record->data, record->data_size, 0xa3); 310 if (response < 0) { 311 err("%s - ezusb_writememory failed for first firmware step (%d %04X %p %d)", 312 __func__, response, record->address, record->data, record->data_size); 313 break; 314 } 315 ++record; 316 } 317 318 response = ezusb_set_reset (serial, 1); 319 320 record = &whiteheat_firmware[0]; 321 while (record->address < 0x1b40) { 322 response = ezusb_writememory (serial, record->address, 323 (unsigned char *)record->data, record->data_size, 0xa0); 324 if (response < 0) { 325 err("%s - ezusb_writememory failed for second firmware step (%d %04X %p %d)", 326 __func__, response, record->address, record->data, record->data_size); 327 break; 328 } 329 ++record; 330 } 331 332 response = ezusb_set_reset (serial, 0); 333 334 return 0; 335 } 336 337 338 static int whiteheat_firmware_attach (struct usb_serial *serial) 339 { 340 /* We want this device to fail to have a driver assigned to it */ 341 return 1; 342 } 343 344 345 /***************************************************************************** 346 * Connect Tech's White Heat serial driver functions 347 *****************************************************************************/ 348 static int whiteheat_attach (struct usb_serial *serial) 349 { 350 struct usb_serial_port *command_port; 351 struct whiteheat_command_private *command_info; 352 struct usb_serial_port *port; 353 struct whiteheat_private *info; 354 struct whiteheat_hw_info *hw_info; 355 int pipe; 356 int ret; 357 int alen; 358 __u8 *command; 359 __u8 *result; 360 int i; 361 int j; 362 struct urb *urb; 363 int buf_size; 364 struct whiteheat_urb_wrap *wrap; 365 struct list_head *tmp; 366 367 command_port = serial->port[COMMAND_PORT]; 368 369 pipe = usb_sndbulkpipe (serial->dev, command_port->bulk_out_endpointAddress); 370 command = kmalloc(2, GFP_KERNEL); 371 if (!command) 372 goto no_command_buffer; 373 command[0] = WHITEHEAT_GET_HW_INFO; 374 command[1] = 0; 375 376 result = kmalloc(sizeof(*hw_info) + 1, GFP_KERNEL); 377 if (!result) 378 goto no_result_buffer; 379 /* 380 * When the module is reloaded the firmware is still there and 381 * the endpoints are still in the usb core unchanged. This is the 382 * unlinking bug in disguise. Same for the call below. 383 */ 384 usb_clear_halt(serial->dev, pipe); 385 ret = usb_bulk_msg (serial->dev, pipe, command, 2, &alen, COMMAND_TIMEOUT_MS); 386 if (ret) { 387 err("%s: Couldn't send command [%d]", serial->type->description, ret); 388 goto no_firmware; 389 } else if (alen != 2) { 390 err("%s: Send command incomplete [%d]", serial->type->description, alen); 391 goto no_firmware; 392 } 393 394 pipe = usb_rcvbulkpipe (serial->dev, command_port->bulk_in_endpointAddress); 395 /* See the comment on the usb_clear_halt() above */ 396 usb_clear_halt(serial->dev, pipe); 397 ret = usb_bulk_msg (serial->dev, pipe, result, sizeof(*hw_info) + 1, &alen, COMMAND_TIMEOUT_MS); 398 if (ret) { 399 err("%s: Couldn't get results [%d]", serial->type->description, ret); 400 goto no_firmware; 401 } else if (alen != sizeof(*hw_info) + 1) { 402 err("%s: Get results incomplete [%d]", serial->type->description, alen); 403 goto no_firmware; 404 } else if (result[0] != command[0]) { 405 err("%s: Command failed [%d]", serial->type->description, result[0]); 406 goto no_firmware; 407 } 408 409 hw_info = (struct whiteheat_hw_info *)&result[1]; 410 411 info("%s: Driver %s: Firmware v%d.%02d", serial->type->description, 412 DRIVER_VERSION, hw_info->sw_major_rev, hw_info->sw_minor_rev); 413 414 for (i = 0; i < serial->num_ports; i++) { 415 port = serial->port[i]; 416 417 info = kmalloc(sizeof(struct whiteheat_private), GFP_KERNEL); 418 if (info == NULL) { 419 err("%s: Out of memory for port structures\n", serial->type->description); 420 goto no_private; 421 } 422 423 spin_lock_init(&info->lock); 424 mutex_init(&info->deathwarrant); 425 info->flags = 0; 426 info->mcr = 0; 427 INIT_WORK(&info->rx_work, rx_data_softint); 428 info->port = port; 429 430 INIT_LIST_HEAD(&info->rx_urbs_free); 431 INIT_LIST_HEAD(&info->rx_urbs_submitted); 432 INIT_LIST_HEAD(&info->rx_urb_q); 433 INIT_LIST_HEAD(&info->tx_urbs_free); 434 INIT_LIST_HEAD(&info->tx_urbs_submitted); 435 436 for (j = 0; j < urb_pool_size; j++) { 437 urb = usb_alloc_urb(0, GFP_KERNEL); 438 if (!urb) { 439 err("No free urbs available"); 440 goto no_rx_urb; 441 } 442 buf_size = port->read_urb->transfer_buffer_length; 443 urb->transfer_buffer = kmalloc(buf_size, GFP_KERNEL); 444 if (!urb->transfer_buffer) { 445 err("Couldn't allocate urb buffer"); 446 goto no_rx_buf; 447 } 448 wrap = kmalloc(sizeof(*wrap), GFP_KERNEL); 449 if (!wrap) { 450 err("Couldn't allocate urb wrapper"); 451 goto no_rx_wrap; 452 } 453 usb_fill_bulk_urb(urb, serial->dev, 454 usb_rcvbulkpipe(serial->dev, 455 port->bulk_in_endpointAddress), 456 urb->transfer_buffer, buf_size, 457 whiteheat_read_callback, port); 458 wrap->urb = urb; 459 list_add(&wrap->list, &info->rx_urbs_free); 460 461 urb = usb_alloc_urb(0, GFP_KERNEL); 462 if (!urb) { 463 err("No free urbs available"); 464 goto no_tx_urb; 465 } 466 buf_size = port->write_urb->transfer_buffer_length; 467 urb->transfer_buffer = kmalloc(buf_size, GFP_KERNEL); 468 if (!urb->transfer_buffer) { 469 err("Couldn't allocate urb buffer"); 470 goto no_tx_buf; 471 } 472 wrap = kmalloc(sizeof(*wrap), GFP_KERNEL); 473 if (!wrap) { 474 err("Couldn't allocate urb wrapper"); 475 goto no_tx_wrap; 476 } 477 usb_fill_bulk_urb(urb, serial->dev, 478 usb_sndbulkpipe(serial->dev, 479 port->bulk_out_endpointAddress), 480 urb->transfer_buffer, buf_size, 481 whiteheat_write_callback, port); 482 wrap->urb = urb; 483 list_add(&wrap->list, &info->tx_urbs_free); 484 } 485 486 usb_set_serial_port_data(port, info); 487 } 488 489 command_info = kmalloc(sizeof(struct whiteheat_command_private), GFP_KERNEL); 490 if (command_info == NULL) { 491 err("%s: Out of memory for port structures\n", serial->type->description); 492 goto no_command_private; 493 } 494 495 mutex_init(&command_info->mutex); 496 command_info->port_running = 0; 497 init_waitqueue_head(&command_info->wait_command); 498 usb_set_serial_port_data(command_port, command_info); 499 command_port->write_urb->complete = command_port_write_callback; 500 command_port->read_urb->complete = command_port_read_callback; 501 kfree(result); 502 kfree(command); 503 504 return 0; 505 506 no_firmware: 507 /* Firmware likely not running */ 508 err("%s: Unable to retrieve firmware version, try replugging\n", serial->type->description); 509 err("%s: If the firmware is not running (status led not blinking)\n", serial->type->description); 510 err("%s: please contact support@connecttech.com\n", serial->type->description); 511 kfree(result); 512 return -ENODEV; 513 514 no_command_private: 515 for (i = serial->num_ports - 1; i >= 0; i--) { 516 port = serial->port[i]; 517 info = usb_get_serial_port_data(port); 518 for (j = urb_pool_size - 1; j >= 0; j--) { 519 tmp = list_first(&info->tx_urbs_free); 520 list_del(tmp); 521 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 522 urb = wrap->urb; 523 kfree(wrap); 524 no_tx_wrap: 525 kfree(urb->transfer_buffer); 526 no_tx_buf: 527 usb_free_urb(urb); 528 no_tx_urb: 529 tmp = list_first(&info->rx_urbs_free); 530 list_del(tmp); 531 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 532 urb = wrap->urb; 533 kfree(wrap); 534 no_rx_wrap: 535 kfree(urb->transfer_buffer); 536 no_rx_buf: 537 usb_free_urb(urb); 538 no_rx_urb: 539 ; 540 } 541 kfree(info); 542 no_private: 543 ; 544 } 545 kfree(result); 546 no_result_buffer: 547 kfree(command); 548 no_command_buffer: 549 return -ENOMEM; 550 } 551 552 553 static void whiteheat_shutdown (struct usb_serial *serial) 554 { 555 struct usb_serial_port *command_port; 556 struct usb_serial_port *port; 557 struct whiteheat_private *info; 558 struct whiteheat_urb_wrap *wrap; 559 struct urb *urb; 560 struct list_head *tmp; 561 struct list_head *tmp2; 562 int i; 563 564 dbg("%s", __func__); 565 566 /* free up our private data for our command port */ 567 command_port = serial->port[COMMAND_PORT]; 568 kfree (usb_get_serial_port_data(command_port)); 569 570 for (i = 0; i < serial->num_ports; i++) { 571 port = serial->port[i]; 572 info = usb_get_serial_port_data(port); 573 list_for_each_safe(tmp, tmp2, &info->rx_urbs_free) { 574 list_del(tmp); 575 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 576 urb = wrap->urb; 577 kfree(wrap); 578 kfree(urb->transfer_buffer); 579 usb_free_urb(urb); 580 } 581 list_for_each_safe(tmp, tmp2, &info->tx_urbs_free) { 582 list_del(tmp); 583 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 584 urb = wrap->urb; 585 kfree(wrap); 586 kfree(urb->transfer_buffer); 587 usb_free_urb(urb); 588 } 589 kfree(info); 590 } 591 592 return; 593 } 594 595 596 static int whiteheat_open (struct usb_serial_port *port, struct file *filp) 597 { 598 int retval = 0; 599 struct ktermios old_term; 600 601 dbg("%s - port %d", __func__, port->number); 602 603 retval = start_command_port(port->serial); 604 if (retval) 605 goto exit; 606 607 port->tty->low_latency = 1; 608 609 /* send an open port command */ 610 retval = firm_open(port); 611 if (retval) { 612 stop_command_port(port->serial); 613 goto exit; 614 } 615 616 retval = firm_purge(port, WHITEHEAT_PURGE_RX | WHITEHEAT_PURGE_TX); 617 if (retval) { 618 firm_close(port); 619 stop_command_port(port->serial); 620 goto exit; 621 } 622 623 old_term.c_cflag = ~port->tty->termios->c_cflag; 624 old_term.c_iflag = ~port->tty->termios->c_iflag; 625 whiteheat_set_termios(port, &old_term); 626 627 /* Work around HCD bugs */ 628 usb_clear_halt(port->serial->dev, port->read_urb->pipe); 629 usb_clear_halt(port->serial->dev, port->write_urb->pipe); 630 631 /* Start reading from the device */ 632 retval = start_port_read(port); 633 if (retval) { 634 err("%s - failed submitting read urb, error %d", __func__, retval); 635 firm_close(port); 636 stop_command_port(port->serial); 637 goto exit; 638 } 639 640 exit: 641 dbg("%s - exit, retval = %d", __func__, retval); 642 return retval; 643 } 644 645 646 static void whiteheat_close(struct usb_serial_port *port, struct file * filp) 647 { 648 struct whiteheat_private *info = usb_get_serial_port_data(port); 649 struct whiteheat_urb_wrap *wrap; 650 struct urb *urb; 651 struct list_head *tmp; 652 struct list_head *tmp2; 653 654 dbg("%s - port %d", __func__, port->number); 655 656 mutex_lock(&port->serial->disc_mutex); 657 /* filp is NULL when called from usb_serial_disconnect */ 658 if ((filp && (tty_hung_up_p(filp))) || port->serial->disconnected) { 659 mutex_unlock(&port->serial->disc_mutex); 660 return; 661 } 662 mutex_unlock(&port->serial->disc_mutex); 663 664 port->tty->closing = 1; 665 666 /* 667 * Not currently in use; tty_wait_until_sent() calls 668 * serial_chars_in_buffer() which deadlocks on the second semaphore 669 * acquisition. This should be fixed at some point. Greg's been 670 * notified. 671 if ((filp->f_flags & (O_NDELAY | O_NONBLOCK)) == 0) { 672 tty_wait_until_sent(port->tty, CLOSING_DELAY); 673 } 674 */ 675 676 tty_driver_flush_buffer(port->tty); 677 tty_ldisc_flush(port->tty); 678 679 firm_report_tx_done(port); 680 681 firm_close(port); 682 683 /* shutdown our bulk reads and writes */ 684 mutex_lock(&info->deathwarrant); 685 spin_lock_irq(&info->lock); 686 list_for_each_safe(tmp, tmp2, &info->rx_urbs_submitted) { 687 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 688 urb = wrap->urb; 689 list_del(tmp); 690 spin_unlock_irq(&info->lock); 691 usb_kill_urb(urb); 692 spin_lock_irq(&info->lock); 693 list_add(tmp, &info->rx_urbs_free); 694 } 695 list_for_each_safe(tmp, tmp2, &info->rx_urb_q) 696 list_move(tmp, &info->rx_urbs_free); 697 list_for_each_safe(tmp, tmp2, &info->tx_urbs_submitted) { 698 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 699 urb = wrap->urb; 700 list_del(tmp); 701 spin_unlock_irq(&info->lock); 702 usb_kill_urb(urb); 703 spin_lock_irq(&info->lock); 704 list_add(tmp, &info->tx_urbs_free); 705 } 706 spin_unlock_irq(&info->lock); 707 mutex_unlock(&info->deathwarrant); 708 709 stop_command_port(port->serial); 710 711 port->tty->closing = 0; 712 } 713 714 715 static int whiteheat_write(struct usb_serial_port *port, const unsigned char *buf, int count) 716 { 717 struct usb_serial *serial = port->serial; 718 struct whiteheat_private *info = usb_get_serial_port_data(port); 719 struct whiteheat_urb_wrap *wrap; 720 struct urb *urb; 721 int result; 722 int bytes; 723 int sent = 0; 724 unsigned long flags; 725 struct list_head *tmp; 726 727 dbg("%s - port %d", __func__, port->number); 728 729 if (count == 0) { 730 dbg("%s - write request of 0 bytes", __func__); 731 return (0); 732 } 733 734 while (count) { 735 spin_lock_irqsave(&info->lock, flags); 736 if (list_empty(&info->tx_urbs_free)) { 737 spin_unlock_irqrestore(&info->lock, flags); 738 break; 739 } 740 tmp = list_first(&info->tx_urbs_free); 741 list_del(tmp); 742 spin_unlock_irqrestore(&info->lock, flags); 743 744 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 745 urb = wrap->urb; 746 bytes = (count > port->bulk_out_size) ? port->bulk_out_size : count; 747 memcpy (urb->transfer_buffer, buf + sent, bytes); 748 749 usb_serial_debug_data(debug, &port->dev, __func__, bytes, urb->transfer_buffer); 750 751 urb->dev = serial->dev; 752 urb->transfer_buffer_length = bytes; 753 result = usb_submit_urb(urb, GFP_ATOMIC); 754 if (result) { 755 err("%s - failed submitting write urb, error %d", __func__, result); 756 sent = result; 757 spin_lock_irqsave(&info->lock, flags); 758 list_add(tmp, &info->tx_urbs_free); 759 spin_unlock_irqrestore(&info->lock, flags); 760 break; 761 } else { 762 sent += bytes; 763 count -= bytes; 764 spin_lock_irqsave(&info->lock, flags); 765 list_add(tmp, &info->tx_urbs_submitted); 766 spin_unlock_irqrestore(&info->lock, flags); 767 } 768 } 769 770 return sent; 771 } 772 773 774 static int whiteheat_write_room(struct usb_serial_port *port) 775 { 776 struct whiteheat_private *info = usb_get_serial_port_data(port); 777 struct list_head *tmp; 778 int room = 0; 779 unsigned long flags; 780 781 dbg("%s - port %d", __func__, port->number); 782 783 spin_lock_irqsave(&info->lock, flags); 784 list_for_each(tmp, &info->tx_urbs_free) 785 room++; 786 spin_unlock_irqrestore(&info->lock, flags); 787 room *= port->bulk_out_size; 788 789 dbg("%s - returns %d", __func__, room); 790 return (room); 791 } 792 793 794 static int whiteheat_tiocmget (struct usb_serial_port *port, struct file *file) 795 { 796 struct whiteheat_private *info = usb_get_serial_port_data(port); 797 unsigned int modem_signals = 0; 798 799 dbg("%s - port %d", __func__, port->number); 800 801 firm_get_dtr_rts(port); 802 if (info->mcr & UART_MCR_DTR) 803 modem_signals |= TIOCM_DTR; 804 if (info->mcr & UART_MCR_RTS) 805 modem_signals |= TIOCM_RTS; 806 807 return modem_signals; 808 } 809 810 811 static int whiteheat_tiocmset (struct usb_serial_port *port, struct file *file, 812 unsigned int set, unsigned int clear) 813 { 814 struct whiteheat_private *info = usb_get_serial_port_data(port); 815 816 dbg("%s - port %d", __func__, port->number); 817 818 if (set & TIOCM_RTS) 819 info->mcr |= UART_MCR_RTS; 820 if (set & TIOCM_DTR) 821 info->mcr |= UART_MCR_DTR; 822 823 if (clear & TIOCM_RTS) 824 info->mcr &= ~UART_MCR_RTS; 825 if (clear & TIOCM_DTR) 826 info->mcr &= ~UART_MCR_DTR; 827 828 firm_set_dtr(port, info->mcr & UART_MCR_DTR); 829 firm_set_rts(port, info->mcr & UART_MCR_RTS); 830 return 0; 831 } 832 833 834 static int whiteheat_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg) 835 { 836 struct serial_struct serstruct; 837 void __user *user_arg = (void __user *)arg; 838 839 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd); 840 841 switch (cmd) { 842 case TIOCGSERIAL: 843 memset(&serstruct, 0, sizeof(serstruct)); 844 serstruct.type = PORT_16654; 845 serstruct.line = port->serial->minor; 846 serstruct.port = port->number; 847 serstruct.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 848 serstruct.xmit_fifo_size = port->bulk_out_size; 849 serstruct.custom_divisor = 0; 850 serstruct.baud_base = 460800; 851 serstruct.close_delay = CLOSING_DELAY; 852 serstruct.closing_wait = CLOSING_DELAY; 853 854 if (copy_to_user(user_arg, &serstruct, sizeof(serstruct))) 855 return -EFAULT; 856 857 break; 858 859 case TIOCSSERIAL: 860 if (copy_from_user(&serstruct, user_arg, sizeof(serstruct))) 861 return -EFAULT; 862 863 /* 864 * For now this is ignored. dip sets the ASYNC_[V]HI flags 865 * but this isn't used by us at all. Maybe someone somewhere 866 * will need the custom_divisor setting. 867 */ 868 869 break; 870 871 default: 872 break; 873 } 874 875 return -ENOIOCTLCMD; 876 } 877 878 879 static void whiteheat_set_termios(struct usb_serial_port *port, struct ktermios *old_termios) 880 { 881 dbg("%s -port %d", __func__, port->number); 882 firm_setup_port(port); 883 } 884 885 886 static void whiteheat_break_ctl(struct usb_serial_port *port, int break_state) { 887 firm_set_break(port, break_state); 888 } 889 890 891 static int whiteheat_chars_in_buffer(struct usb_serial_port *port) 892 { 893 struct whiteheat_private *info = usb_get_serial_port_data(port); 894 struct list_head *tmp; 895 struct whiteheat_urb_wrap *wrap; 896 int chars = 0; 897 unsigned long flags; 898 899 dbg("%s - port %d", __func__, port->number); 900 901 spin_lock_irqsave(&info->lock, flags); 902 list_for_each(tmp, &info->tx_urbs_submitted) { 903 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 904 chars += wrap->urb->transfer_buffer_length; 905 } 906 spin_unlock_irqrestore(&info->lock, flags); 907 908 dbg ("%s - returns %d", __func__, chars); 909 return chars; 910 } 911 912 913 static void whiteheat_throttle (struct usb_serial_port *port) 914 { 915 struct whiteheat_private *info = usb_get_serial_port_data(port); 916 unsigned long flags; 917 918 dbg("%s - port %d", __func__, port->number); 919 920 spin_lock_irqsave(&info->lock, flags); 921 info->flags |= THROTTLED; 922 spin_unlock_irqrestore(&info->lock, flags); 923 924 return; 925 } 926 927 928 static void whiteheat_unthrottle (struct usb_serial_port *port) 929 { 930 struct whiteheat_private *info = usb_get_serial_port_data(port); 931 int actually_throttled; 932 unsigned long flags; 933 934 dbg("%s - port %d", __func__, port->number); 935 936 spin_lock_irqsave(&info->lock, flags); 937 actually_throttled = info->flags & ACTUALLY_THROTTLED; 938 info->flags &= ~(THROTTLED | ACTUALLY_THROTTLED); 939 spin_unlock_irqrestore(&info->lock, flags); 940 941 if (actually_throttled) 942 rx_data_softint(&info->rx_work); 943 944 return; 945 } 946 947 948 /***************************************************************************** 949 * Connect Tech's White Heat callback routines 950 *****************************************************************************/ 951 static void command_port_write_callback(struct urb *urb) 952 { 953 int status = urb->status; 954 955 dbg("%s", __func__); 956 957 if (status) { 958 dbg("nonzero urb status: %d", status); 959 return; 960 } 961 } 962 963 964 static void command_port_read_callback(struct urb *urb) 965 { 966 struct usb_serial_port *command_port = urb->context; 967 struct whiteheat_command_private *command_info; 968 int status = urb->status; 969 unsigned char *data = urb->transfer_buffer; 970 int result; 971 972 dbg("%s", __func__); 973 974 command_info = usb_get_serial_port_data(command_port); 975 if (!command_info) { 976 dbg ("%s - command_info is NULL, exiting.", __func__); 977 return; 978 } 979 if (status) { 980 dbg("%s - nonzero urb status: %d", __func__, status); 981 if (status != -ENOENT) 982 command_info->command_finished = WHITEHEAT_CMD_FAILURE; 983 wake_up(&command_info->wait_command); 984 return; 985 } 986 987 usb_serial_debug_data(debug, &command_port->dev, __func__, urb->actual_length, data); 988 989 if (data[0] == WHITEHEAT_CMD_COMPLETE) { 990 command_info->command_finished = WHITEHEAT_CMD_COMPLETE; 991 wake_up(&command_info->wait_command); 992 } else if (data[0] == WHITEHEAT_CMD_FAILURE) { 993 command_info->command_finished = WHITEHEAT_CMD_FAILURE; 994 wake_up(&command_info->wait_command); 995 } else if (data[0] == WHITEHEAT_EVENT) { 996 /* These are unsolicited reports from the firmware, hence no waiting command to wakeup */ 997 dbg("%s - event received", __func__); 998 } else if (data[0] == WHITEHEAT_GET_DTR_RTS) { 999 memcpy(command_info->result_buffer, &data[1], urb->actual_length - 1); 1000 command_info->command_finished = WHITEHEAT_CMD_COMPLETE; 1001 wake_up(&command_info->wait_command); 1002 } else { 1003 dbg("%s - bad reply from firmware", __func__); 1004 } 1005 1006 /* Continue trying to always read */ 1007 command_port->read_urb->dev = command_port->serial->dev; 1008 result = usb_submit_urb(command_port->read_urb, GFP_ATOMIC); 1009 if (result) 1010 dbg("%s - failed resubmitting read urb, error %d", __func__, result); 1011 } 1012 1013 1014 static void whiteheat_read_callback(struct urb *urb) 1015 { 1016 struct usb_serial_port *port = urb->context; 1017 struct whiteheat_urb_wrap *wrap; 1018 unsigned char *data = urb->transfer_buffer; 1019 struct whiteheat_private *info = usb_get_serial_port_data(port); 1020 int status = urb->status; 1021 1022 dbg("%s - port %d", __func__, port->number); 1023 1024 spin_lock(&info->lock); 1025 wrap = urb_to_wrap(urb, &info->rx_urbs_submitted); 1026 if (!wrap) { 1027 spin_unlock(&info->lock); 1028 err("%s - Not my urb!", __func__); 1029 return; 1030 } 1031 list_del(&wrap->list); 1032 spin_unlock(&info->lock); 1033 1034 if (status) { 1035 dbg("%s - nonzero read bulk status received: %d", 1036 __func__, status); 1037 spin_lock(&info->lock); 1038 list_add(&wrap->list, &info->rx_urbs_free); 1039 spin_unlock(&info->lock); 1040 return; 1041 } 1042 1043 usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length, data); 1044 1045 spin_lock(&info->lock); 1046 list_add_tail(&wrap->list, &info->rx_urb_q); 1047 if (info->flags & THROTTLED) { 1048 info->flags |= ACTUALLY_THROTTLED; 1049 spin_unlock(&info->lock); 1050 return; 1051 } 1052 spin_unlock(&info->lock); 1053 1054 schedule_work(&info->rx_work); 1055 } 1056 1057 1058 static void whiteheat_write_callback(struct urb *urb) 1059 { 1060 struct usb_serial_port *port = urb->context; 1061 struct whiteheat_private *info = usb_get_serial_port_data(port); 1062 struct whiteheat_urb_wrap *wrap; 1063 int status = urb->status; 1064 1065 dbg("%s - port %d", __func__, port->number); 1066 1067 spin_lock(&info->lock); 1068 wrap = urb_to_wrap(urb, &info->tx_urbs_submitted); 1069 if (!wrap) { 1070 spin_unlock(&info->lock); 1071 err("%s - Not my urb!", __func__); 1072 return; 1073 } 1074 list_move(&wrap->list, &info->tx_urbs_free); 1075 spin_unlock(&info->lock); 1076 1077 if (status) { 1078 dbg("%s - nonzero write bulk status received: %d", 1079 __func__, status); 1080 return; 1081 } 1082 1083 usb_serial_port_softint(port); 1084 } 1085 1086 1087 /***************************************************************************** 1088 * Connect Tech's White Heat firmware interface 1089 *****************************************************************************/ 1090 static int firm_send_command(struct usb_serial_port *port, __u8 command, __u8 *data, __u8 datasize) 1091 { 1092 struct usb_serial_port *command_port; 1093 struct whiteheat_command_private *command_info; 1094 struct whiteheat_private *info; 1095 __u8 *transfer_buffer; 1096 int retval = 0; 1097 int t; 1098 1099 dbg("%s - command %d", __func__, command); 1100 1101 command_port = port->serial->port[COMMAND_PORT]; 1102 command_info = usb_get_serial_port_data(command_port); 1103 mutex_lock(&command_info->mutex); 1104 command_info->command_finished = false; 1105 1106 transfer_buffer = (__u8 *)command_port->write_urb->transfer_buffer; 1107 transfer_buffer[0] = command; 1108 memcpy (&transfer_buffer[1], data, datasize); 1109 command_port->write_urb->transfer_buffer_length = datasize + 1; 1110 command_port->write_urb->dev = port->serial->dev; 1111 retval = usb_submit_urb (command_port->write_urb, GFP_NOIO); 1112 if (retval) { 1113 dbg("%s - submit urb failed", __func__); 1114 goto exit; 1115 } 1116 1117 /* wait for the command to complete */ 1118 t = wait_event_timeout(command_info->wait_command, 1119 (bool)command_info->command_finished, COMMAND_TIMEOUT); 1120 if (!t) 1121 usb_kill_urb(command_port->write_urb); 1122 1123 if (command_info->command_finished == false) { 1124 dbg("%s - command timed out.", __func__); 1125 retval = -ETIMEDOUT; 1126 goto exit; 1127 } 1128 1129 if (command_info->command_finished == WHITEHEAT_CMD_FAILURE) { 1130 dbg("%s - command failed.", __func__); 1131 retval = -EIO; 1132 goto exit; 1133 } 1134 1135 if (command_info->command_finished == WHITEHEAT_CMD_COMPLETE) { 1136 dbg("%s - command completed.", __func__); 1137 switch (command) { 1138 case WHITEHEAT_GET_DTR_RTS: 1139 info = usb_get_serial_port_data(port); 1140 memcpy(&info->mcr, command_info->result_buffer, sizeof(struct whiteheat_dr_info)); 1141 break; 1142 } 1143 } 1144 1145 exit: 1146 mutex_unlock(&command_info->mutex); 1147 return retval; 1148 } 1149 1150 1151 static int firm_open(struct usb_serial_port *port) { 1152 struct whiteheat_simple open_command; 1153 1154 open_command.port = port->number - port->serial->minor + 1; 1155 return firm_send_command(port, WHITEHEAT_OPEN, (__u8 *)&open_command, sizeof(open_command)); 1156 } 1157 1158 1159 static int firm_close(struct usb_serial_port *port) { 1160 struct whiteheat_simple close_command; 1161 1162 close_command.port = port->number - port->serial->minor + 1; 1163 return firm_send_command(port, WHITEHEAT_CLOSE, (__u8 *)&close_command, sizeof(close_command)); 1164 } 1165 1166 1167 static int firm_setup_port(struct usb_serial_port *port) { 1168 struct whiteheat_port_settings port_settings; 1169 unsigned int cflag = port->tty->termios->c_cflag; 1170 1171 port_settings.port = port->number + 1; 1172 1173 /* get the byte size */ 1174 switch (cflag & CSIZE) { 1175 case CS5: port_settings.bits = 5; break; 1176 case CS6: port_settings.bits = 6; break; 1177 case CS7: port_settings.bits = 7; break; 1178 default: 1179 case CS8: port_settings.bits = 8; break; 1180 } 1181 dbg("%s - data bits = %d", __func__, port_settings.bits); 1182 1183 /* determine the parity */ 1184 if (cflag & PARENB) 1185 if (cflag & CMSPAR) 1186 if (cflag & PARODD) 1187 port_settings.parity = WHITEHEAT_PAR_MARK; 1188 else 1189 port_settings.parity = WHITEHEAT_PAR_SPACE; 1190 else 1191 if (cflag & PARODD) 1192 port_settings.parity = WHITEHEAT_PAR_ODD; 1193 else 1194 port_settings.parity = WHITEHEAT_PAR_EVEN; 1195 else 1196 port_settings.parity = WHITEHEAT_PAR_NONE; 1197 dbg("%s - parity = %c", __func__, port_settings.parity); 1198 1199 /* figure out the stop bits requested */ 1200 if (cflag & CSTOPB) 1201 port_settings.stop = 2; 1202 else 1203 port_settings.stop = 1; 1204 dbg("%s - stop bits = %d", __func__, port_settings.stop); 1205 1206 /* figure out the flow control settings */ 1207 if (cflag & CRTSCTS) 1208 port_settings.hflow = (WHITEHEAT_HFLOW_CTS | WHITEHEAT_HFLOW_RTS); 1209 else 1210 port_settings.hflow = WHITEHEAT_HFLOW_NONE; 1211 dbg("%s - hardware flow control = %s %s %s %s", __func__, 1212 (port_settings.hflow & WHITEHEAT_HFLOW_CTS) ? "CTS" : "", 1213 (port_settings.hflow & WHITEHEAT_HFLOW_RTS) ? "RTS" : "", 1214 (port_settings.hflow & WHITEHEAT_HFLOW_DSR) ? "DSR" : "", 1215 (port_settings.hflow & WHITEHEAT_HFLOW_DTR) ? "DTR" : ""); 1216 1217 /* determine software flow control */ 1218 if (I_IXOFF(port->tty)) 1219 port_settings.sflow = WHITEHEAT_SFLOW_RXTX; 1220 else 1221 port_settings.sflow = WHITEHEAT_SFLOW_NONE; 1222 dbg("%s - software flow control = %c", __func__, port_settings.sflow); 1223 1224 port_settings.xon = START_CHAR(port->tty); 1225 port_settings.xoff = STOP_CHAR(port->tty); 1226 dbg("%s - XON = %2x, XOFF = %2x", __func__, port_settings.xon, port_settings.xoff); 1227 1228 /* get the baud rate wanted */ 1229 port_settings.baud = tty_get_baud_rate(port->tty); 1230 dbg("%s - baud rate = %d", __func__, port_settings.baud); 1231 1232 /* fixme: should set validated settings */ 1233 tty_encode_baud_rate(port->tty, port_settings.baud, port_settings.baud); 1234 /* handle any settings that aren't specified in the tty structure */ 1235 port_settings.lloop = 0; 1236 1237 /* now send the message to the device */ 1238 return firm_send_command(port, WHITEHEAT_SETUP_PORT, (__u8 *)&port_settings, sizeof(port_settings)); 1239 } 1240 1241 1242 static int firm_set_rts(struct usb_serial_port *port, __u8 onoff) { 1243 struct whiteheat_set_rdb rts_command; 1244 1245 rts_command.port = port->number - port->serial->minor + 1; 1246 rts_command.state = onoff; 1247 return firm_send_command(port, WHITEHEAT_SET_RTS, (__u8 *)&rts_command, sizeof(rts_command)); 1248 } 1249 1250 1251 static int firm_set_dtr(struct usb_serial_port *port, __u8 onoff) { 1252 struct whiteheat_set_rdb dtr_command; 1253 1254 dtr_command.port = port->number - port->serial->minor + 1; 1255 dtr_command.state = onoff; 1256 return firm_send_command(port, WHITEHEAT_SET_RTS, (__u8 *)&dtr_command, sizeof(dtr_command)); 1257 } 1258 1259 1260 static int firm_set_break(struct usb_serial_port *port, __u8 onoff) { 1261 struct whiteheat_set_rdb break_command; 1262 1263 break_command.port = port->number - port->serial->minor + 1; 1264 break_command.state = onoff; 1265 return firm_send_command(port, WHITEHEAT_SET_RTS, (__u8 *)&break_command, sizeof(break_command)); 1266 } 1267 1268 1269 static int firm_purge(struct usb_serial_port *port, __u8 rxtx) { 1270 struct whiteheat_purge purge_command; 1271 1272 purge_command.port = port->number - port->serial->minor + 1; 1273 purge_command.what = rxtx; 1274 return firm_send_command(port, WHITEHEAT_PURGE, (__u8 *)&purge_command, sizeof(purge_command)); 1275 } 1276 1277 1278 static int firm_get_dtr_rts(struct usb_serial_port *port) { 1279 struct whiteheat_simple get_dr_command; 1280 1281 get_dr_command.port = port->number - port->serial->minor + 1; 1282 return firm_send_command(port, WHITEHEAT_GET_DTR_RTS, (__u8 *)&get_dr_command, sizeof(get_dr_command)); 1283 } 1284 1285 1286 static int firm_report_tx_done(struct usb_serial_port *port) { 1287 struct whiteheat_simple close_command; 1288 1289 close_command.port = port->number - port->serial->minor + 1; 1290 return firm_send_command(port, WHITEHEAT_REPORT_TX_DONE, (__u8 *)&close_command, sizeof(close_command)); 1291 } 1292 1293 1294 /***************************************************************************** 1295 * Connect Tech's White Heat utility functions 1296 *****************************************************************************/ 1297 static int start_command_port(struct usb_serial *serial) 1298 { 1299 struct usb_serial_port *command_port; 1300 struct whiteheat_command_private *command_info; 1301 int retval = 0; 1302 1303 command_port = serial->port[COMMAND_PORT]; 1304 command_info = usb_get_serial_port_data(command_port); 1305 mutex_lock(&command_info->mutex); 1306 if (!command_info->port_running) { 1307 /* Work around HCD bugs */ 1308 usb_clear_halt(serial->dev, command_port->read_urb->pipe); 1309 1310 command_port->read_urb->dev = serial->dev; 1311 retval = usb_submit_urb(command_port->read_urb, GFP_KERNEL); 1312 if (retval) { 1313 err("%s - failed submitting read urb, error %d", __func__, retval); 1314 goto exit; 1315 } 1316 } 1317 command_info->port_running++; 1318 1319 exit: 1320 mutex_unlock(&command_info->mutex); 1321 return retval; 1322 } 1323 1324 1325 static void stop_command_port(struct usb_serial *serial) 1326 { 1327 struct usb_serial_port *command_port; 1328 struct whiteheat_command_private *command_info; 1329 1330 command_port = serial->port[COMMAND_PORT]; 1331 command_info = usb_get_serial_port_data(command_port); 1332 mutex_lock(&command_info->mutex); 1333 command_info->port_running--; 1334 if (!command_info->port_running) 1335 usb_kill_urb(command_port->read_urb); 1336 mutex_unlock(&command_info->mutex); 1337 } 1338 1339 1340 static int start_port_read(struct usb_serial_port *port) 1341 { 1342 struct whiteheat_private *info = usb_get_serial_port_data(port); 1343 struct whiteheat_urb_wrap *wrap; 1344 struct urb *urb; 1345 int retval = 0; 1346 unsigned long flags; 1347 struct list_head *tmp; 1348 struct list_head *tmp2; 1349 1350 spin_lock_irqsave(&info->lock, flags); 1351 1352 list_for_each_safe(tmp, tmp2, &info->rx_urbs_free) { 1353 list_del(tmp); 1354 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 1355 urb = wrap->urb; 1356 urb->dev = port->serial->dev; 1357 spin_unlock_irqrestore(&info->lock, flags); 1358 retval = usb_submit_urb(urb, GFP_KERNEL); 1359 if (retval) { 1360 spin_lock_irqsave(&info->lock, flags); 1361 list_add(tmp, &info->rx_urbs_free); 1362 list_for_each_safe(tmp, tmp2, &info->rx_urbs_submitted) { 1363 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 1364 urb = wrap->urb; 1365 list_del(tmp); 1366 spin_unlock_irqrestore(&info->lock, flags); 1367 usb_kill_urb(urb); 1368 spin_lock_irqsave(&info->lock, flags); 1369 list_add(tmp, &info->rx_urbs_free); 1370 } 1371 break; 1372 } 1373 spin_lock_irqsave(&info->lock, flags); 1374 list_add(tmp, &info->rx_urbs_submitted); 1375 } 1376 1377 spin_unlock_irqrestore(&info->lock, flags); 1378 1379 return retval; 1380 } 1381 1382 1383 static struct whiteheat_urb_wrap *urb_to_wrap(struct urb* urb, struct list_head *head) 1384 { 1385 struct whiteheat_urb_wrap *wrap; 1386 struct list_head *tmp; 1387 1388 list_for_each(tmp, head) { 1389 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 1390 if (wrap->urb == urb) 1391 return wrap; 1392 } 1393 1394 return NULL; 1395 } 1396 1397 1398 static struct list_head *list_first(struct list_head *head) 1399 { 1400 return head->next; 1401 } 1402 1403 1404 static void rx_data_softint(struct work_struct *work) 1405 { 1406 struct whiteheat_private *info = 1407 container_of(work, struct whiteheat_private, rx_work); 1408 struct usb_serial_port *port = info->port; 1409 struct tty_struct *tty = port->tty; 1410 struct whiteheat_urb_wrap *wrap; 1411 struct urb *urb; 1412 unsigned long flags; 1413 struct list_head *tmp; 1414 struct list_head *tmp2; 1415 int result; 1416 int sent = 0; 1417 1418 spin_lock_irqsave(&info->lock, flags); 1419 if (info->flags & THROTTLED) { 1420 spin_unlock_irqrestore(&info->lock, flags); 1421 return; 1422 } 1423 1424 list_for_each_safe(tmp, tmp2, &info->rx_urb_q) { 1425 list_del(tmp); 1426 spin_unlock_irqrestore(&info->lock, flags); 1427 1428 wrap = list_entry(tmp, struct whiteheat_urb_wrap, list); 1429 urb = wrap->urb; 1430 1431 if (tty && urb->actual_length) { 1432 int len = tty_buffer_request_room(tty, urb->actual_length); 1433 /* This stuff can go away now I suspect */ 1434 if (unlikely(len < urb->actual_length)) { 1435 spin_lock_irqsave(&info->lock, flags); 1436 list_add(tmp, &info->rx_urb_q); 1437 spin_unlock_irqrestore(&info->lock, flags); 1438 tty_flip_buffer_push(tty); 1439 schedule_work(&info->rx_work); 1440 return; 1441 } 1442 tty_insert_flip_string(tty, urb->transfer_buffer, len); 1443 sent += len; 1444 } 1445 1446 urb->dev = port->serial->dev; 1447 result = usb_submit_urb(urb, GFP_ATOMIC); 1448 if (result) { 1449 err("%s - failed resubmitting read urb, error %d", __func__, result); 1450 spin_lock_irqsave(&info->lock, flags); 1451 list_add(tmp, &info->rx_urbs_free); 1452 continue; 1453 } 1454 1455 spin_lock_irqsave(&info->lock, flags); 1456 list_add(tmp, &info->rx_urbs_submitted); 1457 } 1458 spin_unlock_irqrestore(&info->lock, flags); 1459 1460 if (sent) 1461 tty_flip_buffer_push(tty); 1462 } 1463 1464 1465 /***************************************************************************** 1466 * Connect Tech's White Heat module functions 1467 *****************************************************************************/ 1468 static int __init whiteheat_init (void) 1469 { 1470 int retval; 1471 retval = usb_serial_register(&whiteheat_fake_device); 1472 if (retval) 1473 goto failed_fake_register; 1474 retval = usb_serial_register(&whiteheat_device); 1475 if (retval) 1476 goto failed_device_register; 1477 retval = usb_register(&whiteheat_driver); 1478 if (retval) 1479 goto failed_usb_register; 1480 info(DRIVER_DESC " " DRIVER_VERSION); 1481 return 0; 1482 failed_usb_register: 1483 usb_serial_deregister(&whiteheat_device); 1484 failed_device_register: 1485 usb_serial_deregister(&whiteheat_fake_device); 1486 failed_fake_register: 1487 return retval; 1488 } 1489 1490 1491 static void __exit whiteheat_exit (void) 1492 { 1493 usb_deregister (&whiteheat_driver); 1494 usb_serial_deregister (&whiteheat_fake_device); 1495 usb_serial_deregister (&whiteheat_device); 1496 } 1497 1498 1499 module_init(whiteheat_init); 1500 module_exit(whiteheat_exit); 1501 1502 MODULE_AUTHOR( DRIVER_AUTHOR ); 1503 MODULE_DESCRIPTION( DRIVER_DESC ); 1504 MODULE_LICENSE("GPL"); 1505 1506 module_param(urb_pool_size, int, 0); 1507 MODULE_PARM_DESC(urb_pool_size, "Number of urbs to use for buffering"); 1508 1509 module_param(debug, bool, S_IRUGO | S_IWUSR); 1510 MODULE_PARM_DESC(debug, "Debug enabled or not"); 1511