1 /* 2 * Digi AccelePort USB-4 and USB-2 Serial Converters 3 * 4 * Copyright 2000 by Digi International 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's 12 * usb-serial driver. 13 * 14 * Peter Berger (pberger@brimson.com) 15 * Al Borchers (borchers@steinerpoint.com) 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/errno.h> 20 #include <linux/init.h> 21 #include <linux/slab.h> 22 #include <linux/tty.h> 23 #include <linux/tty_driver.h> 24 #include <linux/tty_flip.h> 25 #include <linux/module.h> 26 #include <linux/spinlock.h> 27 #include <linux/workqueue.h> 28 #include <linux/uaccess.h> 29 #include <linux/usb.h> 30 #include <linux/wait.h> 31 #include <linux/usb/serial.h> 32 33 /* Defines */ 34 35 /* 36 * Version Information 37 */ 38 #define DRIVER_VERSION "v1.80.1.2" 39 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>" 40 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver" 41 42 /* port output buffer length -- must be <= transfer buffer length - 2 */ 43 /* so we can be sure to send the full buffer in one urb */ 44 #define DIGI_OUT_BUF_SIZE 8 45 46 /* port input buffer length -- must be >= transfer buffer length - 3 */ 47 /* so we can be sure to hold at least one full buffer from one urb */ 48 #define DIGI_IN_BUF_SIZE 64 49 50 /* retry timeout while sleeping */ 51 #define DIGI_RETRY_TIMEOUT (HZ/10) 52 53 /* timeout while waiting for tty output to drain in close */ 54 /* this delay is used twice in close, so the total delay could */ 55 /* be twice this value */ 56 #define DIGI_CLOSE_TIMEOUT (5*HZ) 57 58 59 /* AccelePort USB Defines */ 60 61 /* ids */ 62 #define DIGI_VENDOR_ID 0x05c5 63 #define DIGI_2_ID 0x0002 /* USB-2 */ 64 #define DIGI_4_ID 0x0004 /* USB-4 */ 65 66 /* commands 67 * "INB": can be used on the in-band endpoint 68 * "OOB": can be used on the out-of-band endpoint 69 */ 70 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */ 71 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */ 72 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */ 73 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */ 74 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */ 75 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */ 76 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */ 77 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */ 78 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */ 79 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */ 80 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */ 81 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */ 82 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */ 83 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */ 84 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */ 85 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */ 86 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */ 87 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */ 88 #define DIGI_CMD_SEND_DATA 18 /* INB */ 89 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */ 90 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */ 91 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */ 92 93 /* baud rates */ 94 #define DIGI_BAUD_50 0 95 #define DIGI_BAUD_75 1 96 #define DIGI_BAUD_110 2 97 #define DIGI_BAUD_150 3 98 #define DIGI_BAUD_200 4 99 #define DIGI_BAUD_300 5 100 #define DIGI_BAUD_600 6 101 #define DIGI_BAUD_1200 7 102 #define DIGI_BAUD_1800 8 103 #define DIGI_BAUD_2400 9 104 #define DIGI_BAUD_4800 10 105 #define DIGI_BAUD_7200 11 106 #define DIGI_BAUD_9600 12 107 #define DIGI_BAUD_14400 13 108 #define DIGI_BAUD_19200 14 109 #define DIGI_BAUD_28800 15 110 #define DIGI_BAUD_38400 16 111 #define DIGI_BAUD_57600 17 112 #define DIGI_BAUD_76800 18 113 #define DIGI_BAUD_115200 19 114 #define DIGI_BAUD_153600 20 115 #define DIGI_BAUD_230400 21 116 #define DIGI_BAUD_460800 22 117 118 /* arguments */ 119 #define DIGI_WORD_SIZE_5 0 120 #define DIGI_WORD_SIZE_6 1 121 #define DIGI_WORD_SIZE_7 2 122 #define DIGI_WORD_SIZE_8 3 123 124 #define DIGI_PARITY_NONE 0 125 #define DIGI_PARITY_ODD 1 126 #define DIGI_PARITY_EVEN 2 127 #define DIGI_PARITY_MARK 3 128 #define DIGI_PARITY_SPACE 4 129 130 #define DIGI_STOP_BITS_1 0 131 #define DIGI_STOP_BITS_2 1 132 133 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1 134 #define DIGI_INPUT_FLOW_CONTROL_RTS 2 135 #define DIGI_INPUT_FLOW_CONTROL_DTR 4 136 137 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1 138 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2 139 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4 140 141 #define DIGI_DTR_INACTIVE 0 142 #define DIGI_DTR_ACTIVE 1 143 #define DIGI_DTR_INPUT_FLOW_CONTROL 2 144 145 #define DIGI_RTS_INACTIVE 0 146 #define DIGI_RTS_ACTIVE 1 147 #define DIGI_RTS_INPUT_FLOW_CONTROL 2 148 #define DIGI_RTS_TOGGLE 3 149 150 #define DIGI_FLUSH_TX 1 151 #define DIGI_FLUSH_RX 2 152 #define DIGI_RESUME_TX 4 /* clears xoff condition */ 153 154 #define DIGI_TRANSMIT_NOT_IDLE 0 155 #define DIGI_TRANSMIT_IDLE 1 156 157 #define DIGI_DISABLE 0 158 #define DIGI_ENABLE 1 159 160 #define DIGI_DEASSERT 0 161 #define DIGI_ASSERT 1 162 163 /* in band status codes */ 164 #define DIGI_OVERRUN_ERROR 4 165 #define DIGI_PARITY_ERROR 8 166 #define DIGI_FRAMING_ERROR 16 167 #define DIGI_BREAK_ERROR 32 168 169 /* out of band status */ 170 #define DIGI_NO_ERROR 0 171 #define DIGI_BAD_FIRST_PARAMETER 1 172 #define DIGI_BAD_SECOND_PARAMETER 2 173 #define DIGI_INVALID_LINE 3 174 #define DIGI_INVALID_OPCODE 4 175 176 /* input signals */ 177 #define DIGI_READ_INPUT_SIGNALS_SLOT 1 178 #define DIGI_READ_INPUT_SIGNALS_ERR 2 179 #define DIGI_READ_INPUT_SIGNALS_BUSY 4 180 #define DIGI_READ_INPUT_SIGNALS_PE 8 181 #define DIGI_READ_INPUT_SIGNALS_CTS 16 182 #define DIGI_READ_INPUT_SIGNALS_DSR 32 183 #define DIGI_READ_INPUT_SIGNALS_RI 64 184 #define DIGI_READ_INPUT_SIGNALS_DCD 128 185 186 187 /* Structures */ 188 189 struct digi_serial { 190 spinlock_t ds_serial_lock; 191 struct usb_serial_port *ds_oob_port; /* out-of-band port */ 192 int ds_oob_port_num; /* index of out-of-band port */ 193 int ds_device_started; 194 }; 195 196 struct digi_port { 197 spinlock_t dp_port_lock; 198 int dp_port_num; 199 int dp_out_buf_len; 200 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE]; 201 int dp_write_urb_in_use; 202 unsigned int dp_modem_signals; 203 wait_queue_head_t dp_modem_change_wait; 204 int dp_transmit_idle; 205 wait_queue_head_t dp_transmit_idle_wait; 206 int dp_throttled; 207 int dp_throttle_restart; 208 wait_queue_head_t dp_flush_wait; 209 wait_queue_head_t dp_close_wait; /* wait queue for close */ 210 struct work_struct dp_wakeup_work; 211 struct usb_serial_port *dp_port; 212 }; 213 214 215 /* Local Function Declarations */ 216 217 static void digi_wakeup_write(struct usb_serial_port *port); 218 static void digi_wakeup_write_lock(struct work_struct *work); 219 static int digi_write_oob_command(struct usb_serial_port *port, 220 unsigned char *buf, int count, int interruptible); 221 static int digi_write_inb_command(struct usb_serial_port *port, 222 unsigned char *buf, int count, unsigned long timeout); 223 static int digi_set_modem_signals(struct usb_serial_port *port, 224 unsigned int modem_signals, int interruptible); 225 static int digi_transmit_idle(struct usb_serial_port *port, 226 unsigned long timeout); 227 static void digi_rx_throttle(struct tty_struct *tty); 228 static void digi_rx_unthrottle(struct tty_struct *tty); 229 static void digi_set_termios(struct tty_struct *tty, 230 struct usb_serial_port *port, struct ktermios *old_termios); 231 static void digi_break_ctl(struct tty_struct *tty, int break_state); 232 static int digi_tiocmget(struct tty_struct *tty); 233 static int digi_tiocmset(struct tty_struct *tty, unsigned int set, 234 unsigned int clear); 235 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, 236 const unsigned char *buf, int count); 237 static void digi_write_bulk_callback(struct urb *urb); 238 static int digi_write_room(struct tty_struct *tty); 239 static int digi_chars_in_buffer(struct tty_struct *tty); 240 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port); 241 static void digi_close(struct usb_serial_port *port); 242 static void digi_dtr_rts(struct usb_serial_port *port, int on); 243 static int digi_startup_device(struct usb_serial *serial); 244 static int digi_startup(struct usb_serial *serial); 245 static void digi_disconnect(struct usb_serial *serial); 246 static void digi_release(struct usb_serial *serial); 247 static int digi_port_probe(struct usb_serial_port *port); 248 static int digi_port_remove(struct usb_serial_port *port); 249 static void digi_read_bulk_callback(struct urb *urb); 250 static int digi_read_inb_callback(struct urb *urb); 251 static int digi_read_oob_callback(struct urb *urb); 252 253 254 static const struct usb_device_id id_table_combined[] = { 255 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 256 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 257 { } /* Terminating entry */ 258 }; 259 260 static const struct usb_device_id id_table_2[] = { 261 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 262 { } /* Terminating entry */ 263 }; 264 265 static const struct usb_device_id id_table_4[] = { 266 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 267 { } /* Terminating entry */ 268 }; 269 270 MODULE_DEVICE_TABLE(usb, id_table_combined); 271 272 /* device info needed for the Digi serial converter */ 273 274 static struct usb_serial_driver digi_acceleport_2_device = { 275 .driver = { 276 .owner = THIS_MODULE, 277 .name = "digi_2", 278 }, 279 .description = "Digi 2 port USB adapter", 280 .id_table = id_table_2, 281 .num_ports = 3, 282 .open = digi_open, 283 .close = digi_close, 284 .dtr_rts = digi_dtr_rts, 285 .write = digi_write, 286 .write_room = digi_write_room, 287 .write_bulk_callback = digi_write_bulk_callback, 288 .read_bulk_callback = digi_read_bulk_callback, 289 .chars_in_buffer = digi_chars_in_buffer, 290 .throttle = digi_rx_throttle, 291 .unthrottle = digi_rx_unthrottle, 292 .set_termios = digi_set_termios, 293 .break_ctl = digi_break_ctl, 294 .tiocmget = digi_tiocmget, 295 .tiocmset = digi_tiocmset, 296 .attach = digi_startup, 297 .disconnect = digi_disconnect, 298 .release = digi_release, 299 .port_probe = digi_port_probe, 300 .port_remove = digi_port_remove, 301 }; 302 303 static struct usb_serial_driver digi_acceleport_4_device = { 304 .driver = { 305 .owner = THIS_MODULE, 306 .name = "digi_4", 307 }, 308 .description = "Digi 4 port USB adapter", 309 .id_table = id_table_4, 310 .num_ports = 4, 311 .open = digi_open, 312 .close = digi_close, 313 .write = digi_write, 314 .write_room = digi_write_room, 315 .write_bulk_callback = digi_write_bulk_callback, 316 .read_bulk_callback = digi_read_bulk_callback, 317 .chars_in_buffer = digi_chars_in_buffer, 318 .throttle = digi_rx_throttle, 319 .unthrottle = digi_rx_unthrottle, 320 .set_termios = digi_set_termios, 321 .break_ctl = digi_break_ctl, 322 .tiocmget = digi_tiocmget, 323 .tiocmset = digi_tiocmset, 324 .attach = digi_startup, 325 .disconnect = digi_disconnect, 326 .release = digi_release, 327 .port_probe = digi_port_probe, 328 .port_remove = digi_port_remove, 329 }; 330 331 static struct usb_serial_driver * const serial_drivers[] = { 332 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL 333 }; 334 335 /* Functions */ 336 337 /* 338 * Cond Wait Interruptible Timeout Irqrestore 339 * 340 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout 341 * so that wake ups are not lost if they occur between the unlock 342 * and the sleep. In other words, spin_unlock_irqrestore and 343 * interruptible_sleep_on_timeout are "atomic" with respect to 344 * wake ups. This is used to implement condition variables. 345 * 346 * interruptible_sleep_on_timeout is deprecated and has been replaced 347 * with the equivalent code. 348 */ 349 350 static long cond_wait_interruptible_timeout_irqrestore( 351 wait_queue_head_t *q, long timeout, 352 spinlock_t *lock, unsigned long flags) 353 __releases(lock) 354 { 355 DEFINE_WAIT(wait); 356 357 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE); 358 spin_unlock_irqrestore(lock, flags); 359 timeout = schedule_timeout(timeout); 360 finish_wait(q, &wait); 361 362 return timeout; 363 } 364 365 366 /* 367 * Digi Wakeup Write 368 * 369 * Wake up port, line discipline, and tty processes sleeping 370 * on writes. 371 */ 372 373 static void digi_wakeup_write_lock(struct work_struct *work) 374 { 375 struct digi_port *priv = 376 container_of(work, struct digi_port, dp_wakeup_work); 377 struct usb_serial_port *port = priv->dp_port; 378 unsigned long flags; 379 380 spin_lock_irqsave(&priv->dp_port_lock, flags); 381 digi_wakeup_write(port); 382 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 383 } 384 385 static void digi_wakeup_write(struct usb_serial_port *port) 386 { 387 struct tty_struct *tty = tty_port_tty_get(&port->port); 388 if (tty) { 389 tty_wakeup(tty); 390 tty_kref_put(tty); 391 } 392 } 393 394 395 /* 396 * Digi Write OOB Command 397 * 398 * Write commands on the out of band port. Commands are 4 399 * bytes each, multiple commands can be sent at once, and 400 * no command will be split across USB packets. Returns 0 401 * if successful, -EINTR if interrupted while sleeping and 402 * the interruptible flag is true, or a negative error 403 * returned by usb_submit_urb. 404 */ 405 406 static int digi_write_oob_command(struct usb_serial_port *port, 407 unsigned char *buf, int count, int interruptible) 408 { 409 int ret = 0; 410 int len; 411 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 412 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 413 unsigned long flags = 0; 414 415 dev_dbg(&port->dev, 416 "digi_write_oob_command: TOP: port=%d, count=%d\n", 417 oob_priv->dp_port_num, count); 418 419 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 420 while (count > 0) { 421 while (oob_priv->dp_write_urb_in_use) { 422 cond_wait_interruptible_timeout_irqrestore( 423 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 424 &oob_priv->dp_port_lock, flags); 425 if (interruptible && signal_pending(current)) 426 return -EINTR; 427 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 428 } 429 430 /* len must be a multiple of 4, so commands are not split */ 431 len = min(count, oob_port->bulk_out_size); 432 if (len > 4) 433 len &= ~3; 434 memcpy(oob_port->write_urb->transfer_buffer, buf, len); 435 oob_port->write_urb->transfer_buffer_length = len; 436 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); 437 if (ret == 0) { 438 oob_priv->dp_write_urb_in_use = 1; 439 count -= len; 440 buf += len; 441 } 442 } 443 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); 444 if (ret) 445 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", 446 __func__, ret); 447 return ret; 448 449 } 450 451 452 /* 453 * Digi Write In Band Command 454 * 455 * Write commands on the given port. Commands are 4 456 * bytes each, multiple commands can be sent at once, and 457 * no command will be split across USB packets. If timeout 458 * is non-zero, write in band command will return after 459 * waiting unsuccessfully for the URB status to clear for 460 * timeout ticks. Returns 0 if successful, or a negative 461 * error returned by digi_write. 462 */ 463 464 static int digi_write_inb_command(struct usb_serial_port *port, 465 unsigned char *buf, int count, unsigned long timeout) 466 { 467 int ret = 0; 468 int len; 469 struct digi_port *priv = usb_get_serial_port_data(port); 470 unsigned char *data = port->write_urb->transfer_buffer; 471 unsigned long flags = 0; 472 473 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n", 474 priv->dp_port_num, count); 475 476 if (timeout) 477 timeout += jiffies; 478 else 479 timeout = ULONG_MAX; 480 481 spin_lock_irqsave(&priv->dp_port_lock, flags); 482 while (count > 0 && ret == 0) { 483 while (priv->dp_write_urb_in_use && 484 time_before(jiffies, timeout)) { 485 cond_wait_interruptible_timeout_irqrestore( 486 &port->write_wait, DIGI_RETRY_TIMEOUT, 487 &priv->dp_port_lock, flags); 488 if (signal_pending(current)) 489 return -EINTR; 490 spin_lock_irqsave(&priv->dp_port_lock, flags); 491 } 492 493 /* len must be a multiple of 4 and small enough to */ 494 /* guarantee the write will send buffered data first, */ 495 /* so commands are in order with data and not split */ 496 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 497 if (len > 4) 498 len &= ~3; 499 500 /* write any buffered data first */ 501 if (priv->dp_out_buf_len > 0) { 502 data[0] = DIGI_CMD_SEND_DATA; 503 data[1] = priv->dp_out_buf_len; 504 memcpy(data + 2, priv->dp_out_buf, 505 priv->dp_out_buf_len); 506 memcpy(data + 2 + priv->dp_out_buf_len, buf, len); 507 port->write_urb->transfer_buffer_length 508 = priv->dp_out_buf_len + 2 + len; 509 } else { 510 memcpy(data, buf, len); 511 port->write_urb->transfer_buffer_length = len; 512 } 513 514 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 515 if (ret == 0) { 516 priv->dp_write_urb_in_use = 1; 517 priv->dp_out_buf_len = 0; 518 count -= len; 519 buf += len; 520 } 521 522 } 523 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 524 525 if (ret) 526 dev_err(&port->dev, 527 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 528 __func__, ret, priv->dp_port_num); 529 return ret; 530 } 531 532 533 /* 534 * Digi Set Modem Signals 535 * 536 * Sets or clears DTR and RTS on the port, according to the 537 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags 538 * for the modem_signals argument. Returns 0 if successful, 539 * -EINTR if interrupted while sleeping, or a non-zero error 540 * returned by usb_submit_urb. 541 */ 542 543 static int digi_set_modem_signals(struct usb_serial_port *port, 544 unsigned int modem_signals, int interruptible) 545 { 546 547 int ret; 548 struct digi_port *port_priv = usb_get_serial_port_data(port); 549 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 550 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 551 unsigned char *data = oob_port->write_urb->transfer_buffer; 552 unsigned long flags = 0; 553 554 555 dev_dbg(&port->dev, 556 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n", 557 port_priv->dp_port_num, modem_signals); 558 559 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 560 spin_lock(&port_priv->dp_port_lock); 561 562 while (oob_priv->dp_write_urb_in_use) { 563 spin_unlock(&port_priv->dp_port_lock); 564 cond_wait_interruptible_timeout_irqrestore( 565 &oob_port->write_wait, DIGI_RETRY_TIMEOUT, 566 &oob_priv->dp_port_lock, flags); 567 if (interruptible && signal_pending(current)) 568 return -EINTR; 569 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 570 spin_lock(&port_priv->dp_port_lock); 571 } 572 data[0] = DIGI_CMD_SET_DTR_SIGNAL; 573 data[1] = port_priv->dp_port_num; 574 data[2] = (modem_signals & TIOCM_DTR) ? 575 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; 576 data[3] = 0; 577 data[4] = DIGI_CMD_SET_RTS_SIGNAL; 578 data[5] = port_priv->dp_port_num; 579 data[6] = (modem_signals & TIOCM_RTS) ? 580 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; 581 data[7] = 0; 582 583 oob_port->write_urb->transfer_buffer_length = 8; 584 585 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); 586 if (ret == 0) { 587 oob_priv->dp_write_urb_in_use = 1; 588 port_priv->dp_modem_signals = 589 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS)) 590 | (modem_signals&(TIOCM_DTR|TIOCM_RTS)); 591 } 592 spin_unlock(&port_priv->dp_port_lock); 593 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); 594 if (ret) 595 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", 596 __func__, ret); 597 return ret; 598 } 599 600 /* 601 * Digi Transmit Idle 602 * 603 * Digi transmit idle waits, up to timeout ticks, for the transmitter 604 * to go idle. It returns 0 if successful or a negative error. 605 * 606 * There are race conditions here if more than one process is calling 607 * digi_transmit_idle on the same port at the same time. However, this 608 * is only called from close, and only one process can be in close on a 609 * port at a time, so its ok. 610 */ 611 612 static int digi_transmit_idle(struct usb_serial_port *port, 613 unsigned long timeout) 614 { 615 int ret; 616 unsigned char buf[2]; 617 struct digi_port *priv = usb_get_serial_port_data(port); 618 unsigned long flags = 0; 619 620 spin_lock_irqsave(&priv->dp_port_lock, flags); 621 priv->dp_transmit_idle = 0; 622 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 623 624 buf[0] = DIGI_CMD_TRANSMIT_IDLE; 625 buf[1] = 0; 626 627 timeout += jiffies; 628 629 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies); 630 if (ret != 0) 631 return ret; 632 633 spin_lock_irqsave(&priv->dp_port_lock, flags); 634 635 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) { 636 cond_wait_interruptible_timeout_irqrestore( 637 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, 638 &priv->dp_port_lock, flags); 639 if (signal_pending(current)) 640 return -EINTR; 641 spin_lock_irqsave(&priv->dp_port_lock, flags); 642 } 643 priv->dp_transmit_idle = 0; 644 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 645 return 0; 646 647 } 648 649 650 static void digi_rx_throttle(struct tty_struct *tty) 651 { 652 unsigned long flags; 653 struct usb_serial_port *port = tty->driver_data; 654 struct digi_port *priv = usb_get_serial_port_data(port); 655 656 /* stop receiving characters by not resubmitting the read urb */ 657 spin_lock_irqsave(&priv->dp_port_lock, flags); 658 priv->dp_throttled = 1; 659 priv->dp_throttle_restart = 0; 660 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 661 } 662 663 664 static void digi_rx_unthrottle(struct tty_struct *tty) 665 { 666 int ret = 0; 667 unsigned long flags; 668 struct usb_serial_port *port = tty->driver_data; 669 struct digi_port *priv = usb_get_serial_port_data(port); 670 671 spin_lock_irqsave(&priv->dp_port_lock, flags); 672 673 /* restart read chain */ 674 if (priv->dp_throttle_restart) 675 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC); 676 677 /* turn throttle off */ 678 priv->dp_throttled = 0; 679 priv->dp_throttle_restart = 0; 680 681 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 682 683 if (ret) 684 dev_err(&port->dev, 685 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 686 __func__, ret, priv->dp_port_num); 687 } 688 689 690 static void digi_set_termios(struct tty_struct *tty, 691 struct usb_serial_port *port, struct ktermios *old_termios) 692 { 693 struct digi_port *priv = usb_get_serial_port_data(port); 694 struct device *dev = &port->dev; 695 unsigned int iflag = tty->termios.c_iflag; 696 unsigned int cflag = tty->termios.c_cflag; 697 unsigned int old_iflag = old_termios->c_iflag; 698 unsigned int old_cflag = old_termios->c_cflag; 699 unsigned char buf[32]; 700 unsigned int modem_signals; 701 int arg, ret; 702 int i = 0; 703 speed_t baud; 704 705 dev_dbg(dev, 706 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n", 707 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag); 708 709 /* set baud rate */ 710 baud = tty_get_baud_rate(tty); 711 if (baud != tty_termios_baud_rate(old_termios)) { 712 arg = -1; 713 714 /* reassert DTR and (maybe) RTS on transition from B0 */ 715 if ((old_cflag&CBAUD) == B0) { 716 /* don't set RTS if using hardware flow control */ 717 /* and throttling input */ 718 modem_signals = TIOCM_DTR; 719 if (!(tty->termios.c_cflag & CRTSCTS) || 720 !test_bit(TTY_THROTTLED, &tty->flags)) 721 modem_signals |= TIOCM_RTS; 722 digi_set_modem_signals(port, modem_signals, 1); 723 } 724 switch (baud) { 725 /* drop DTR and RTS on transition to B0 */ 726 case 0: digi_set_modem_signals(port, 0, 1); break; 727 case 50: arg = DIGI_BAUD_50; break; 728 case 75: arg = DIGI_BAUD_75; break; 729 case 110: arg = DIGI_BAUD_110; break; 730 case 150: arg = DIGI_BAUD_150; break; 731 case 200: arg = DIGI_BAUD_200; break; 732 case 300: arg = DIGI_BAUD_300; break; 733 case 600: arg = DIGI_BAUD_600; break; 734 case 1200: arg = DIGI_BAUD_1200; break; 735 case 1800: arg = DIGI_BAUD_1800; break; 736 case 2400: arg = DIGI_BAUD_2400; break; 737 case 4800: arg = DIGI_BAUD_4800; break; 738 case 9600: arg = DIGI_BAUD_9600; break; 739 case 19200: arg = DIGI_BAUD_19200; break; 740 case 38400: arg = DIGI_BAUD_38400; break; 741 case 57600: arg = DIGI_BAUD_57600; break; 742 case 115200: arg = DIGI_BAUD_115200; break; 743 case 230400: arg = DIGI_BAUD_230400; break; 744 case 460800: arg = DIGI_BAUD_460800; break; 745 default: 746 arg = DIGI_BAUD_9600; 747 baud = 9600; 748 break; 749 } 750 if (arg != -1) { 751 buf[i++] = DIGI_CMD_SET_BAUD_RATE; 752 buf[i++] = priv->dp_port_num; 753 buf[i++] = arg; 754 buf[i++] = 0; 755 } 756 } 757 /* set parity */ 758 tty->termios.c_cflag &= ~CMSPAR; 759 760 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) { 761 if (cflag&PARENB) { 762 if (cflag&PARODD) 763 arg = DIGI_PARITY_ODD; 764 else 765 arg = DIGI_PARITY_EVEN; 766 } else { 767 arg = DIGI_PARITY_NONE; 768 } 769 buf[i++] = DIGI_CMD_SET_PARITY; 770 buf[i++] = priv->dp_port_num; 771 buf[i++] = arg; 772 buf[i++] = 0; 773 } 774 /* set word size */ 775 if ((cflag&CSIZE) != (old_cflag&CSIZE)) { 776 arg = -1; 777 switch (cflag&CSIZE) { 778 case CS5: arg = DIGI_WORD_SIZE_5; break; 779 case CS6: arg = DIGI_WORD_SIZE_6; break; 780 case CS7: arg = DIGI_WORD_SIZE_7; break; 781 case CS8: arg = DIGI_WORD_SIZE_8; break; 782 default: 783 dev_dbg(dev, 784 "digi_set_termios: can't handle word size %d\n", 785 (cflag&CSIZE)); 786 break; 787 } 788 789 if (arg != -1) { 790 buf[i++] = DIGI_CMD_SET_WORD_SIZE; 791 buf[i++] = priv->dp_port_num; 792 buf[i++] = arg; 793 buf[i++] = 0; 794 } 795 796 } 797 798 /* set stop bits */ 799 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) { 800 801 if ((cflag&CSTOPB)) 802 arg = DIGI_STOP_BITS_2; 803 else 804 arg = DIGI_STOP_BITS_1; 805 806 buf[i++] = DIGI_CMD_SET_STOP_BITS; 807 buf[i++] = priv->dp_port_num; 808 buf[i++] = arg; 809 buf[i++] = 0; 810 811 } 812 813 /* set input flow control */ 814 if ((iflag&IXOFF) != (old_iflag&IXOFF) 815 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) { 816 arg = 0; 817 if (iflag&IXOFF) 818 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 819 else 820 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 821 822 if (cflag&CRTSCTS) { 823 arg |= DIGI_INPUT_FLOW_CONTROL_RTS; 824 825 /* On USB-4 it is necessary to assert RTS prior */ 826 /* to selecting RTS input flow control. */ 827 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; 828 buf[i++] = priv->dp_port_num; 829 buf[i++] = DIGI_RTS_ACTIVE; 830 buf[i++] = 0; 831 832 } else { 833 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; 834 } 835 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 836 buf[i++] = priv->dp_port_num; 837 buf[i++] = arg; 838 buf[i++] = 0; 839 } 840 841 /* set output flow control */ 842 if ((iflag & IXON) != (old_iflag & IXON) 843 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 844 arg = 0; 845 if (iflag & IXON) 846 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 847 else 848 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 849 850 if (cflag & CRTSCTS) { 851 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; 852 } else { 853 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; 854 tty->hw_stopped = 0; 855 } 856 857 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 858 buf[i++] = priv->dp_port_num; 859 buf[i++] = arg; 860 buf[i++] = 0; 861 } 862 863 /* set receive enable/disable */ 864 if ((cflag & CREAD) != (old_cflag & CREAD)) { 865 if (cflag & CREAD) 866 arg = DIGI_ENABLE; 867 else 868 arg = DIGI_DISABLE; 869 870 buf[i++] = DIGI_CMD_RECEIVE_ENABLE; 871 buf[i++] = priv->dp_port_num; 872 buf[i++] = arg; 873 buf[i++] = 0; 874 } 875 ret = digi_write_oob_command(port, buf, i, 1); 876 if (ret != 0) 877 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret); 878 tty_encode_baud_rate(tty, baud, baud); 879 } 880 881 882 static void digi_break_ctl(struct tty_struct *tty, int break_state) 883 { 884 struct usb_serial_port *port = tty->driver_data; 885 unsigned char buf[4]; 886 887 buf[0] = DIGI_CMD_BREAK_CONTROL; 888 buf[1] = 2; /* length */ 889 buf[2] = break_state ? 1 : 0; 890 buf[3] = 0; /* pad */ 891 digi_write_inb_command(port, buf, 4, 0); 892 } 893 894 895 static int digi_tiocmget(struct tty_struct *tty) 896 { 897 struct usb_serial_port *port = tty->driver_data; 898 struct digi_port *priv = usb_get_serial_port_data(port); 899 unsigned int val; 900 unsigned long flags; 901 902 spin_lock_irqsave(&priv->dp_port_lock, flags); 903 val = priv->dp_modem_signals; 904 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 905 return val; 906 } 907 908 909 static int digi_tiocmset(struct tty_struct *tty, 910 unsigned int set, unsigned int clear) 911 { 912 struct usb_serial_port *port = tty->driver_data; 913 struct digi_port *priv = usb_get_serial_port_data(port); 914 unsigned int val; 915 unsigned long flags; 916 917 spin_lock_irqsave(&priv->dp_port_lock, flags); 918 val = (priv->dp_modem_signals & ~clear) | set; 919 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 920 return digi_set_modem_signals(port, val, 1); 921 } 922 923 924 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, 925 const unsigned char *buf, int count) 926 { 927 928 int ret, data_len, new_len; 929 struct digi_port *priv = usb_get_serial_port_data(port); 930 unsigned char *data = port->write_urb->transfer_buffer; 931 unsigned long flags = 0; 932 933 dev_dbg(&port->dev, 934 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n", 935 priv->dp_port_num, count, in_interrupt()); 936 937 /* copy user data (which can sleep) before getting spin lock */ 938 count = min(count, port->bulk_out_size-2); 939 count = min(64, count); 940 941 /* be sure only one write proceeds at a time */ 942 /* there are races on the port private buffer */ 943 spin_lock_irqsave(&priv->dp_port_lock, flags); 944 945 /* wait for urb status clear to submit another urb */ 946 if (priv->dp_write_urb_in_use) { 947 /* buffer data if count is 1 (probably put_char) if possible */ 948 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) { 949 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; 950 new_len = 1; 951 } else { 952 new_len = 0; 953 } 954 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 955 return new_len; 956 } 957 958 /* allow space for any buffered data and for new data, up to */ 959 /* transfer buffer size - 2 (for command and length bytes) */ 960 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 961 data_len = new_len + priv->dp_out_buf_len; 962 963 if (data_len == 0) { 964 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 965 return 0; 966 } 967 968 port->write_urb->transfer_buffer_length = data_len+2; 969 970 *data++ = DIGI_CMD_SEND_DATA; 971 *data++ = data_len; 972 973 /* copy in buffered data first */ 974 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len); 975 data += priv->dp_out_buf_len; 976 977 /* copy in new data */ 978 memcpy(data, buf, new_len); 979 980 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 981 if (ret == 0) { 982 priv->dp_write_urb_in_use = 1; 983 ret = new_len; 984 priv->dp_out_buf_len = 0; 985 } 986 987 /* return length of new data written, or error */ 988 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 989 if (ret < 0) 990 dev_err_console(port, 991 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 992 __func__, ret, priv->dp_port_num); 993 dev_dbg(&port->dev, "digi_write: returning %d\n", ret); 994 return ret; 995 996 } 997 998 static void digi_write_bulk_callback(struct urb *urb) 999 { 1000 1001 struct usb_serial_port *port = urb->context; 1002 struct usb_serial *serial; 1003 struct digi_port *priv; 1004 struct digi_serial *serial_priv; 1005 int ret = 0; 1006 int status = urb->status; 1007 1008 /* port and serial sanity check */ 1009 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) { 1010 pr_err("%s: port or port->private is NULL, status=%d\n", 1011 __func__, status); 1012 return; 1013 } 1014 serial = port->serial; 1015 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) { 1016 dev_err(&port->dev, 1017 "%s: serial or serial->private is NULL, status=%d\n", 1018 __func__, status); 1019 return; 1020 } 1021 1022 /* handle oob callback */ 1023 if (priv->dp_port_num == serial_priv->ds_oob_port_num) { 1024 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n"); 1025 spin_lock(&priv->dp_port_lock); 1026 priv->dp_write_urb_in_use = 0; 1027 wake_up_interruptible(&port->write_wait); 1028 spin_unlock(&priv->dp_port_lock); 1029 return; 1030 } 1031 1032 /* try to send any buffered data on this port */ 1033 spin_lock(&priv->dp_port_lock); 1034 priv->dp_write_urb_in_use = 0; 1035 if (priv->dp_out_buf_len > 0) { 1036 *((unsigned char *)(port->write_urb->transfer_buffer)) 1037 = (unsigned char)DIGI_CMD_SEND_DATA; 1038 *((unsigned char *)(port->write_urb->transfer_buffer) + 1) 1039 = (unsigned char)priv->dp_out_buf_len; 1040 port->write_urb->transfer_buffer_length = 1041 priv->dp_out_buf_len + 2; 1042 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf, 1043 priv->dp_out_buf_len); 1044 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 1045 if (ret == 0) { 1046 priv->dp_write_urb_in_use = 1; 1047 priv->dp_out_buf_len = 0; 1048 } 1049 } 1050 /* wake up processes sleeping on writes immediately */ 1051 digi_wakeup_write(port); 1052 /* also queue up a wakeup at scheduler time, in case we */ 1053 /* lost the race in write_chan(). */ 1054 schedule_work(&priv->dp_wakeup_work); 1055 1056 spin_unlock(&priv->dp_port_lock); 1057 if (ret && ret != -EPERM) 1058 dev_err_console(port, 1059 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1060 __func__, ret, priv->dp_port_num); 1061 } 1062 1063 static int digi_write_room(struct tty_struct *tty) 1064 { 1065 struct usb_serial_port *port = tty->driver_data; 1066 struct digi_port *priv = usb_get_serial_port_data(port); 1067 int room; 1068 unsigned long flags = 0; 1069 1070 spin_lock_irqsave(&priv->dp_port_lock, flags); 1071 1072 if (priv->dp_write_urb_in_use) 1073 room = 0; 1074 else 1075 room = port->bulk_out_size - 2 - priv->dp_out_buf_len; 1076 1077 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1078 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room); 1079 return room; 1080 1081 } 1082 1083 static int digi_chars_in_buffer(struct tty_struct *tty) 1084 { 1085 struct usb_serial_port *port = tty->driver_data; 1086 struct digi_port *priv = usb_get_serial_port_data(port); 1087 1088 if (priv->dp_write_urb_in_use) { 1089 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n", 1090 priv->dp_port_num, port->bulk_out_size - 2); 1091 /* return(port->bulk_out_size - 2); */ 1092 return 256; 1093 } else { 1094 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n", 1095 priv->dp_port_num, priv->dp_out_buf_len); 1096 return priv->dp_out_buf_len; 1097 } 1098 1099 } 1100 1101 static void digi_dtr_rts(struct usb_serial_port *port, int on) 1102 { 1103 /* Adjust DTR and RTS */ 1104 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1); 1105 } 1106 1107 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port) 1108 { 1109 int ret; 1110 unsigned char buf[32]; 1111 struct digi_port *priv = usb_get_serial_port_data(port); 1112 struct ktermios not_termios; 1113 1114 /* be sure the device is started up */ 1115 if (digi_startup_device(port->serial) != 0) 1116 return -ENXIO; 1117 1118 /* read modem signals automatically whenever they change */ 1119 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; 1120 buf[1] = priv->dp_port_num; 1121 buf[2] = DIGI_ENABLE; 1122 buf[3] = 0; 1123 1124 /* flush fifos */ 1125 buf[4] = DIGI_CMD_IFLUSH_FIFO; 1126 buf[5] = priv->dp_port_num; 1127 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1128 buf[7] = 0; 1129 1130 ret = digi_write_oob_command(port, buf, 8, 1); 1131 if (ret != 0) 1132 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret); 1133 1134 /* set termios settings */ 1135 if (tty) { 1136 not_termios.c_cflag = ~tty->termios.c_cflag; 1137 not_termios.c_iflag = ~tty->termios.c_iflag; 1138 digi_set_termios(tty, port, ¬_termios); 1139 } 1140 return 0; 1141 } 1142 1143 1144 static void digi_close(struct usb_serial_port *port) 1145 { 1146 DEFINE_WAIT(wait); 1147 int ret; 1148 unsigned char buf[32]; 1149 struct digi_port *priv = usb_get_serial_port_data(port); 1150 1151 mutex_lock(&port->serial->disc_mutex); 1152 /* if disconnected, just clear flags */ 1153 if (port->serial->disconnected) 1154 goto exit; 1155 1156 if (port->serial->dev) { 1157 /* FIXME: Transmit idle belongs in the wait_unti_sent path */ 1158 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT); 1159 1160 /* disable input flow control */ 1161 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1162 buf[1] = priv->dp_port_num; 1163 buf[2] = DIGI_DISABLE; 1164 buf[3] = 0; 1165 1166 /* disable output flow control */ 1167 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1168 buf[5] = priv->dp_port_num; 1169 buf[6] = DIGI_DISABLE; 1170 buf[7] = 0; 1171 1172 /* disable reading modem signals automatically */ 1173 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; 1174 buf[9] = priv->dp_port_num; 1175 buf[10] = DIGI_DISABLE; 1176 buf[11] = 0; 1177 1178 /* disable receive */ 1179 buf[12] = DIGI_CMD_RECEIVE_ENABLE; 1180 buf[13] = priv->dp_port_num; 1181 buf[14] = DIGI_DISABLE; 1182 buf[15] = 0; 1183 1184 /* flush fifos */ 1185 buf[16] = DIGI_CMD_IFLUSH_FIFO; 1186 buf[17] = priv->dp_port_num; 1187 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1188 buf[19] = 0; 1189 1190 ret = digi_write_oob_command(port, buf, 20, 0); 1191 if (ret != 0) 1192 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n", ret); 1193 1194 /* wait for final commands on oob port to complete */ 1195 prepare_to_wait(&priv->dp_flush_wait, &wait, 1196 TASK_INTERRUPTIBLE); 1197 schedule_timeout(DIGI_CLOSE_TIMEOUT); 1198 finish_wait(&priv->dp_flush_wait, &wait); 1199 1200 /* shutdown any outstanding bulk writes */ 1201 usb_kill_urb(port->write_urb); 1202 } 1203 exit: 1204 spin_lock_irq(&priv->dp_port_lock); 1205 priv->dp_write_urb_in_use = 0; 1206 wake_up_interruptible(&priv->dp_close_wait); 1207 spin_unlock_irq(&priv->dp_port_lock); 1208 mutex_unlock(&port->serial->disc_mutex); 1209 } 1210 1211 1212 /* 1213 * Digi Startup Device 1214 * 1215 * Starts reads on all ports. Must be called AFTER startup, with 1216 * urbs initialized. Returns 0 if successful, non-zero error otherwise. 1217 */ 1218 1219 static int digi_startup_device(struct usb_serial *serial) 1220 { 1221 int i, ret = 0; 1222 struct digi_serial *serial_priv = usb_get_serial_data(serial); 1223 struct usb_serial_port *port; 1224 1225 /* be sure this happens exactly once */ 1226 spin_lock(&serial_priv->ds_serial_lock); 1227 if (serial_priv->ds_device_started) { 1228 spin_unlock(&serial_priv->ds_serial_lock); 1229 return 0; 1230 } 1231 serial_priv->ds_device_started = 1; 1232 spin_unlock(&serial_priv->ds_serial_lock); 1233 1234 /* start reading from each bulk in endpoint for the device */ 1235 /* set USB_DISABLE_SPD flag for write bulk urbs */ 1236 for (i = 0; i < serial->type->num_ports + 1; i++) { 1237 port = serial->port[i]; 1238 ret = usb_submit_urb(port->read_urb, GFP_KERNEL); 1239 if (ret != 0) { 1240 dev_err(&port->dev, 1241 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1242 __func__, ret, i); 1243 break; 1244 } 1245 } 1246 return ret; 1247 } 1248 1249 static int digi_port_init(struct usb_serial_port *port, unsigned port_num) 1250 { 1251 struct digi_port *priv; 1252 1253 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1254 if (!priv) 1255 return -ENOMEM; 1256 1257 spin_lock_init(&priv->dp_port_lock); 1258 priv->dp_port_num = port_num; 1259 init_waitqueue_head(&priv->dp_modem_change_wait); 1260 init_waitqueue_head(&priv->dp_transmit_idle_wait); 1261 init_waitqueue_head(&priv->dp_flush_wait); 1262 init_waitqueue_head(&priv->dp_close_wait); 1263 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock); 1264 priv->dp_port = port; 1265 1266 init_waitqueue_head(&port->write_wait); 1267 1268 usb_set_serial_port_data(port, priv); 1269 1270 return 0; 1271 } 1272 1273 static int digi_startup(struct usb_serial *serial) 1274 { 1275 struct digi_serial *serial_priv; 1276 int ret; 1277 1278 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 1279 if (!serial_priv) 1280 return -ENOMEM; 1281 1282 spin_lock_init(&serial_priv->ds_serial_lock); 1283 serial_priv->ds_oob_port_num = serial->type->num_ports; 1284 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; 1285 1286 ret = digi_port_init(serial_priv->ds_oob_port, 1287 serial_priv->ds_oob_port_num); 1288 if (ret) { 1289 kfree(serial_priv); 1290 return ret; 1291 } 1292 1293 usb_set_serial_data(serial, serial_priv); 1294 1295 return 0; 1296 } 1297 1298 1299 static void digi_disconnect(struct usb_serial *serial) 1300 { 1301 int i; 1302 1303 /* stop reads and writes on all ports */ 1304 for (i = 0; i < serial->type->num_ports + 1; i++) { 1305 usb_kill_urb(serial->port[i]->read_urb); 1306 usb_kill_urb(serial->port[i]->write_urb); 1307 } 1308 } 1309 1310 1311 static void digi_release(struct usb_serial *serial) 1312 { 1313 struct digi_serial *serial_priv; 1314 struct digi_port *priv; 1315 1316 serial_priv = usb_get_serial_data(serial); 1317 1318 priv = usb_get_serial_port_data(serial_priv->ds_oob_port); 1319 kfree(priv); 1320 1321 kfree(serial_priv); 1322 } 1323 1324 static int digi_port_probe(struct usb_serial_port *port) 1325 { 1326 unsigned port_num; 1327 1328 port_num = port->number - port->serial->minor; 1329 1330 return digi_port_init(port, port_num); 1331 } 1332 1333 static int digi_port_remove(struct usb_serial_port *port) 1334 { 1335 struct digi_port *priv; 1336 1337 priv = usb_get_serial_port_data(port); 1338 kfree(priv); 1339 1340 return 0; 1341 } 1342 1343 static void digi_read_bulk_callback(struct urb *urb) 1344 { 1345 struct usb_serial_port *port = urb->context; 1346 struct digi_port *priv; 1347 struct digi_serial *serial_priv; 1348 int ret; 1349 int status = urb->status; 1350 1351 /* port sanity check, do not resubmit if port is not valid */ 1352 if (port == NULL) 1353 return; 1354 priv = usb_get_serial_port_data(port); 1355 if (priv == NULL) { 1356 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n", 1357 __func__, status); 1358 return; 1359 } 1360 if (port->serial == NULL || 1361 (serial_priv = usb_get_serial_data(port->serial)) == NULL) { 1362 dev_err(&port->dev, "%s: serial is bad or serial->private " 1363 "is NULL, status=%d\n", __func__, status); 1364 return; 1365 } 1366 1367 /* do not resubmit urb if it has any status error */ 1368 if (status) { 1369 dev_err(&port->dev, 1370 "%s: nonzero read bulk status: status=%d, port=%d\n", 1371 __func__, status, priv->dp_port_num); 1372 return; 1373 } 1374 1375 /* handle oob or inb callback, do not resubmit if error */ 1376 if (priv->dp_port_num == serial_priv->ds_oob_port_num) { 1377 if (digi_read_oob_callback(urb) != 0) 1378 return; 1379 } else { 1380 if (digi_read_inb_callback(urb) != 0) 1381 return; 1382 } 1383 1384 /* continue read */ 1385 ret = usb_submit_urb(urb, GFP_ATOMIC); 1386 if (ret != 0 && ret != -EPERM) { 1387 dev_err(&port->dev, 1388 "%s: failed resubmitting urb, ret=%d, port=%d\n", 1389 __func__, ret, priv->dp_port_num); 1390 } 1391 1392 } 1393 1394 /* 1395 * Digi Read INB Callback 1396 * 1397 * Digi Read INB Callback handles reads on the in band ports, sending 1398 * the data on to the tty subsystem. When called we know port and 1399 * port->private are not NULL and port->serial has been validated. 1400 * It returns 0 if successful, 1 if successful but the port is 1401 * throttled, and -1 if the sanity checks failed. 1402 */ 1403 1404 static int digi_read_inb_callback(struct urb *urb) 1405 { 1406 1407 struct usb_serial_port *port = urb->context; 1408 struct tty_struct *tty; 1409 struct digi_port *priv = usb_get_serial_port_data(port); 1410 int opcode = ((unsigned char *)urb->transfer_buffer)[0]; 1411 int len = ((unsigned char *)urb->transfer_buffer)[1]; 1412 int port_status = ((unsigned char *)urb->transfer_buffer)[2]; 1413 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3; 1414 int flag, throttled; 1415 int status = urb->status; 1416 1417 /* do not process callbacks on closed ports */ 1418 /* but do continue the read chain */ 1419 if (urb->status == -ENOENT) 1420 return 0; 1421 1422 /* short/multiple packet check */ 1423 if (urb->actual_length != len + 2) { 1424 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, " 1425 "status=%d, port=%d, opcode=%d, len=%d, " 1426 "actual_length=%d, status=%d\n", __func__, status, 1427 priv->dp_port_num, opcode, len, urb->actual_length, 1428 port_status); 1429 return -1; 1430 } 1431 1432 tty = tty_port_tty_get(&port->port); 1433 spin_lock(&priv->dp_port_lock); 1434 1435 /* check for throttle; if set, do not resubmit read urb */ 1436 /* indicate the read chain needs to be restarted on unthrottle */ 1437 throttled = priv->dp_throttled; 1438 if (throttled) 1439 priv->dp_throttle_restart = 1; 1440 1441 /* receive data */ 1442 if (tty && opcode == DIGI_CMD_RECEIVE_DATA) { 1443 /* get flag from port_status */ 1444 flag = 0; 1445 1446 /* overrun is special, not associated with a char */ 1447 if (port_status & DIGI_OVERRUN_ERROR) 1448 tty_insert_flip_char(tty, 0, TTY_OVERRUN); 1449 1450 /* break takes precedence over parity, */ 1451 /* which takes precedence over framing errors */ 1452 if (port_status & DIGI_BREAK_ERROR) 1453 flag = TTY_BREAK; 1454 else if (port_status & DIGI_PARITY_ERROR) 1455 flag = TTY_PARITY; 1456 else if (port_status & DIGI_FRAMING_ERROR) 1457 flag = TTY_FRAME; 1458 1459 /* data length is len-1 (one byte of len is port_status) */ 1460 --len; 1461 if (len > 0) { 1462 tty_insert_flip_string_fixed_flag(tty, data, flag, 1463 len); 1464 tty_flip_buffer_push(tty); 1465 } 1466 } 1467 spin_unlock(&priv->dp_port_lock); 1468 tty_kref_put(tty); 1469 1470 if (opcode == DIGI_CMD_RECEIVE_DISABLE) 1471 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__); 1472 else if (opcode != DIGI_CMD_RECEIVE_DATA) 1473 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode); 1474 1475 return throttled ? 1 : 0; 1476 1477 } 1478 1479 1480 /* 1481 * Digi Read OOB Callback 1482 * 1483 * Digi Read OOB Callback handles reads on the out of band port. 1484 * When called we know port and port->private are not NULL and 1485 * the port->serial is valid. It returns 0 if successful, and 1486 * -1 if the sanity checks failed. 1487 */ 1488 1489 static int digi_read_oob_callback(struct urb *urb) 1490 { 1491 1492 struct usb_serial_port *port = urb->context; 1493 struct usb_serial *serial = port->serial; 1494 struct tty_struct *tty; 1495 struct digi_port *priv = usb_get_serial_port_data(port); 1496 int opcode, line, status, val; 1497 int i; 1498 unsigned int rts; 1499 1500 /* handle each oob command */ 1501 for (i = 0; i < urb->actual_length - 3;) { 1502 opcode = ((unsigned char *)urb->transfer_buffer)[i++]; 1503 line = ((unsigned char *)urb->transfer_buffer)[i++]; 1504 status = ((unsigned char *)urb->transfer_buffer)[i++]; 1505 val = ((unsigned char *)urb->transfer_buffer)[i++]; 1506 1507 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n", 1508 opcode, line, status, val); 1509 1510 if (status != 0 || line >= serial->type->num_ports) 1511 continue; 1512 1513 port = serial->port[line]; 1514 1515 priv = usb_get_serial_port_data(port); 1516 if (priv == NULL) 1517 return -1; 1518 1519 tty = tty_port_tty_get(&port->port); 1520 1521 rts = 0; 1522 if (tty) 1523 rts = tty->termios.c_cflag & CRTSCTS; 1524 1525 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) { 1526 spin_lock(&priv->dp_port_lock); 1527 /* convert from digi flags to termiox flags */ 1528 if (val & DIGI_READ_INPUT_SIGNALS_CTS) { 1529 priv->dp_modem_signals |= TIOCM_CTS; 1530 /* port must be open to use tty struct */ 1531 if (rts) { 1532 tty->hw_stopped = 0; 1533 digi_wakeup_write(port); 1534 } 1535 } else { 1536 priv->dp_modem_signals &= ~TIOCM_CTS; 1537 /* port must be open to use tty struct */ 1538 if (rts) 1539 tty->hw_stopped = 1; 1540 } 1541 if (val & DIGI_READ_INPUT_SIGNALS_DSR) 1542 priv->dp_modem_signals |= TIOCM_DSR; 1543 else 1544 priv->dp_modem_signals &= ~TIOCM_DSR; 1545 if (val & DIGI_READ_INPUT_SIGNALS_RI) 1546 priv->dp_modem_signals |= TIOCM_RI; 1547 else 1548 priv->dp_modem_signals &= ~TIOCM_RI; 1549 if (val & DIGI_READ_INPUT_SIGNALS_DCD) 1550 priv->dp_modem_signals |= TIOCM_CD; 1551 else 1552 priv->dp_modem_signals &= ~TIOCM_CD; 1553 1554 wake_up_interruptible(&priv->dp_modem_change_wait); 1555 spin_unlock(&priv->dp_port_lock); 1556 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) { 1557 spin_lock(&priv->dp_port_lock); 1558 priv->dp_transmit_idle = 1; 1559 wake_up_interruptible(&priv->dp_transmit_idle_wait); 1560 spin_unlock(&priv->dp_port_lock); 1561 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) { 1562 wake_up_interruptible(&priv->dp_flush_wait); 1563 } 1564 tty_kref_put(tty); 1565 } 1566 return 0; 1567 1568 } 1569 1570 module_usb_serial_driver(serial_drivers, id_table_combined); 1571 1572 MODULE_AUTHOR(DRIVER_AUTHOR); 1573 MODULE_DESCRIPTION(DRIVER_DESC); 1574 MODULE_LICENSE("GPL"); 1575