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