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