1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Digi AccelePort USB-4 and USB-2 Serial Converters 4 * 5 * Copyright 2000 by Digi International 6 * 7 * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's 8 * usb-serial driver. 9 * 10 * Peter Berger (pberger@brimson.com) 11 * Al Borchers (borchers@steinerpoint.com) 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/slab.h> 17 #include <linux/tty.h> 18 #include <linux/tty_driver.h> 19 #include <linux/tty_flip.h> 20 #include <linux/module.h> 21 #include <linux/spinlock.h> 22 #include <linux/uaccess.h> 23 #include <linux/usb.h> 24 #include <linux/wait.h> 25 #include <linux/sched/signal.h> 26 #include <linux/usb/serial.h> 27 28 /* Defines */ 29 30 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>" 31 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver" 32 33 /* port output buffer length -- must be <= transfer buffer length - 2 */ 34 /* so we can be sure to send the full buffer in one urb */ 35 #define DIGI_OUT_BUF_SIZE 8 36 37 /* port input buffer length -- must be >= transfer buffer length - 3 */ 38 /* so we can be sure to hold at least one full buffer from one urb */ 39 #define DIGI_IN_BUF_SIZE 64 40 41 /* retry timeout while sleeping */ 42 #define DIGI_RETRY_TIMEOUT (HZ/10) 43 44 /* timeout while waiting for tty output to drain in close */ 45 /* this delay is used twice in close, so the total delay could */ 46 /* be twice this value */ 47 #define DIGI_CLOSE_TIMEOUT (5*HZ) 48 49 50 /* AccelePort USB Defines */ 51 52 /* ids */ 53 #define DIGI_VENDOR_ID 0x05c5 54 #define DIGI_2_ID 0x0002 /* USB-2 */ 55 #define DIGI_4_ID 0x0004 /* USB-4 */ 56 57 /* commands 58 * "INB": can be used on the in-band endpoint 59 * "OOB": can be used on the out-of-band endpoint 60 */ 61 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */ 62 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */ 63 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */ 64 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */ 65 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */ 66 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */ 67 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */ 68 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */ 69 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */ 70 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */ 71 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */ 72 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */ 73 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */ 74 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */ 75 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */ 76 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */ 77 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */ 78 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */ 79 #define DIGI_CMD_SEND_DATA 18 /* INB */ 80 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */ 81 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */ 82 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */ 83 84 /* baud rates */ 85 #define DIGI_BAUD_50 0 86 #define DIGI_BAUD_75 1 87 #define DIGI_BAUD_110 2 88 #define DIGI_BAUD_150 3 89 #define DIGI_BAUD_200 4 90 #define DIGI_BAUD_300 5 91 #define DIGI_BAUD_600 6 92 #define DIGI_BAUD_1200 7 93 #define DIGI_BAUD_1800 8 94 #define DIGI_BAUD_2400 9 95 #define DIGI_BAUD_4800 10 96 #define DIGI_BAUD_7200 11 97 #define DIGI_BAUD_9600 12 98 #define DIGI_BAUD_14400 13 99 #define DIGI_BAUD_19200 14 100 #define DIGI_BAUD_28800 15 101 #define DIGI_BAUD_38400 16 102 #define DIGI_BAUD_57600 17 103 #define DIGI_BAUD_76800 18 104 #define DIGI_BAUD_115200 19 105 #define DIGI_BAUD_153600 20 106 #define DIGI_BAUD_230400 21 107 #define DIGI_BAUD_460800 22 108 109 /* arguments */ 110 #define DIGI_WORD_SIZE_5 0 111 #define DIGI_WORD_SIZE_6 1 112 #define DIGI_WORD_SIZE_7 2 113 #define DIGI_WORD_SIZE_8 3 114 115 #define DIGI_PARITY_NONE 0 116 #define DIGI_PARITY_ODD 1 117 #define DIGI_PARITY_EVEN 2 118 #define DIGI_PARITY_MARK 3 119 #define DIGI_PARITY_SPACE 4 120 121 #define DIGI_STOP_BITS_1 0 122 #define DIGI_STOP_BITS_2 1 123 124 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1 125 #define DIGI_INPUT_FLOW_CONTROL_RTS 2 126 #define DIGI_INPUT_FLOW_CONTROL_DTR 4 127 128 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1 129 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2 130 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4 131 132 #define DIGI_DTR_INACTIVE 0 133 #define DIGI_DTR_ACTIVE 1 134 #define DIGI_DTR_INPUT_FLOW_CONTROL 2 135 136 #define DIGI_RTS_INACTIVE 0 137 #define DIGI_RTS_ACTIVE 1 138 #define DIGI_RTS_INPUT_FLOW_CONTROL 2 139 #define DIGI_RTS_TOGGLE 3 140 141 #define DIGI_FLUSH_TX 1 142 #define DIGI_FLUSH_RX 2 143 #define DIGI_RESUME_TX 4 /* clears xoff condition */ 144 145 #define DIGI_TRANSMIT_NOT_IDLE 0 146 #define DIGI_TRANSMIT_IDLE 1 147 148 #define DIGI_DISABLE 0 149 #define DIGI_ENABLE 1 150 151 #define DIGI_DEASSERT 0 152 #define DIGI_ASSERT 1 153 154 /* in band status codes */ 155 #define DIGI_OVERRUN_ERROR 4 156 #define DIGI_PARITY_ERROR 8 157 #define DIGI_FRAMING_ERROR 16 158 #define DIGI_BREAK_ERROR 32 159 160 /* out of band status */ 161 #define DIGI_NO_ERROR 0 162 #define DIGI_BAD_FIRST_PARAMETER 1 163 #define DIGI_BAD_SECOND_PARAMETER 2 164 #define DIGI_INVALID_LINE 3 165 #define DIGI_INVALID_OPCODE 4 166 167 /* input signals */ 168 #define DIGI_READ_INPUT_SIGNALS_SLOT 1 169 #define DIGI_READ_INPUT_SIGNALS_ERR 2 170 #define DIGI_READ_INPUT_SIGNALS_BUSY 4 171 #define DIGI_READ_INPUT_SIGNALS_PE 8 172 #define DIGI_READ_INPUT_SIGNALS_CTS 16 173 #define DIGI_READ_INPUT_SIGNALS_DSR 32 174 #define DIGI_READ_INPUT_SIGNALS_RI 64 175 #define DIGI_READ_INPUT_SIGNALS_DCD 128 176 177 178 /* Structures */ 179 180 struct digi_serial { 181 spinlock_t ds_serial_lock; 182 struct usb_serial_port *ds_oob_port; /* out-of-band port */ 183 int ds_oob_port_num; /* index of out-of-band port */ 184 int ds_device_started; 185 }; 186 187 struct digi_port { 188 spinlock_t dp_port_lock; 189 int dp_port_num; 190 int dp_out_buf_len; 191 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE]; 192 int dp_write_urb_in_use; 193 unsigned int dp_modem_signals; 194 int dp_transmit_idle; 195 wait_queue_head_t dp_transmit_idle_wait; 196 int dp_throttled; 197 int dp_throttle_restart; 198 wait_queue_head_t dp_flush_wait; 199 wait_queue_head_t dp_close_wait; /* wait queue for close */ 200 wait_queue_head_t write_wait; 201 struct usb_serial_port *dp_port; 202 }; 203 204 205 /* Local Function Declarations */ 206 207 static int digi_write_oob_command(struct usb_serial_port *port, 208 unsigned char *buf, int count, int interruptible); 209 static int digi_write_inb_command(struct usb_serial_port *port, 210 unsigned char *buf, int count, unsigned long timeout); 211 static int digi_set_modem_signals(struct usb_serial_port *port, 212 unsigned int modem_signals, int interruptible); 213 static int digi_transmit_idle(struct usb_serial_port *port, 214 unsigned long timeout); 215 static void digi_rx_throttle(struct tty_struct *tty); 216 static void digi_rx_unthrottle(struct tty_struct *tty); 217 static void digi_set_termios(struct tty_struct *tty, 218 struct usb_serial_port *port, struct ktermios *old_termios); 219 static void digi_break_ctl(struct tty_struct *tty, int break_state); 220 static int digi_tiocmget(struct tty_struct *tty); 221 static int digi_tiocmset(struct tty_struct *tty, unsigned int set, 222 unsigned int clear); 223 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, 224 const unsigned char *buf, int count); 225 static void digi_write_bulk_callback(struct urb *urb); 226 static unsigned int digi_write_room(struct tty_struct *tty); 227 static unsigned int digi_chars_in_buffer(struct tty_struct *tty); 228 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port); 229 static void digi_close(struct usb_serial_port *port); 230 static void digi_dtr_rts(struct usb_serial_port *port, int on); 231 static int digi_startup_device(struct usb_serial *serial); 232 static int digi_startup(struct usb_serial *serial); 233 static void digi_disconnect(struct usb_serial *serial); 234 static void digi_release(struct usb_serial *serial); 235 static int digi_port_probe(struct usb_serial_port *port); 236 static void digi_port_remove(struct usb_serial_port *port); 237 static void digi_read_bulk_callback(struct urb *urb); 238 static int digi_read_inb_callback(struct urb *urb); 239 static int digi_read_oob_callback(struct urb *urb); 240 241 242 static const struct usb_device_id id_table_combined[] = { 243 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 244 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 245 { } /* Terminating entry */ 246 }; 247 248 static const struct usb_device_id id_table_2[] = { 249 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, 250 { } /* Terminating entry */ 251 }; 252 253 static const struct usb_device_id id_table_4[] = { 254 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, 255 { } /* Terminating entry */ 256 }; 257 258 MODULE_DEVICE_TABLE(usb, id_table_combined); 259 260 /* device info needed for the Digi serial converter */ 261 262 static struct usb_serial_driver digi_acceleport_2_device = { 263 .driver = { 264 .owner = THIS_MODULE, 265 .name = "digi_2", 266 }, 267 .description = "Digi 2 port USB adapter", 268 .id_table = id_table_2, 269 .num_ports = 3, 270 .num_bulk_in = 4, 271 .num_bulk_out = 4, 272 .open = digi_open, 273 .close = digi_close, 274 .dtr_rts = digi_dtr_rts, 275 .write = digi_write, 276 .write_room = digi_write_room, 277 .write_bulk_callback = digi_write_bulk_callback, 278 .read_bulk_callback = digi_read_bulk_callback, 279 .chars_in_buffer = digi_chars_in_buffer, 280 .throttle = digi_rx_throttle, 281 .unthrottle = digi_rx_unthrottle, 282 .set_termios = digi_set_termios, 283 .break_ctl = digi_break_ctl, 284 .tiocmget = digi_tiocmget, 285 .tiocmset = digi_tiocmset, 286 .attach = digi_startup, 287 .disconnect = digi_disconnect, 288 .release = digi_release, 289 .port_probe = digi_port_probe, 290 .port_remove = digi_port_remove, 291 }; 292 293 static struct usb_serial_driver digi_acceleport_4_device = { 294 .driver = { 295 .owner = THIS_MODULE, 296 .name = "digi_4", 297 }, 298 .description = "Digi 4 port USB adapter", 299 .id_table = id_table_4, 300 .num_ports = 4, 301 .num_bulk_in = 5, 302 .num_bulk_out = 5, 303 .open = digi_open, 304 .close = digi_close, 305 .write = digi_write, 306 .write_room = digi_write_room, 307 .write_bulk_callback = digi_write_bulk_callback, 308 .read_bulk_callback = digi_read_bulk_callback, 309 .chars_in_buffer = digi_chars_in_buffer, 310 .throttle = digi_rx_throttle, 311 .unthrottle = digi_rx_unthrottle, 312 .set_termios = digi_set_termios, 313 .break_ctl = digi_break_ctl, 314 .tiocmget = digi_tiocmget, 315 .tiocmset = digi_tiocmset, 316 .attach = digi_startup, 317 .disconnect = digi_disconnect, 318 .release = digi_release, 319 .port_probe = digi_port_probe, 320 .port_remove = digi_port_remove, 321 }; 322 323 static struct usb_serial_driver * const serial_drivers[] = { 324 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL 325 }; 326 327 /* Functions */ 328 329 /* 330 * Cond Wait Interruptible Timeout Irqrestore 331 * 332 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout 333 * so that wake ups are not lost if they occur between the unlock 334 * and the sleep. In other words, spin_unlock_irqrestore and 335 * interruptible_sleep_on_timeout are "atomic" with respect to 336 * wake ups. This is used to implement condition variables. 337 * 338 * interruptible_sleep_on_timeout is deprecated and has been replaced 339 * with the equivalent code. 340 */ 341 342 static long cond_wait_interruptible_timeout_irqrestore( 343 wait_queue_head_t *q, long timeout, 344 spinlock_t *lock, unsigned long flags) 345 __releases(lock) 346 { 347 DEFINE_WAIT(wait); 348 349 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE); 350 spin_unlock_irqrestore(lock, flags); 351 timeout = schedule_timeout(timeout); 352 finish_wait(q, &wait); 353 354 return timeout; 355 } 356 357 /* 358 * Digi Write OOB Command 359 * 360 * Write commands on the out of band port. Commands are 4 361 * bytes each, multiple commands can be sent at once, and 362 * no command will be split across USB packets. Returns 0 363 * if successful, -EINTR if interrupted while sleeping and 364 * the interruptible flag is true, or a negative error 365 * returned by usb_submit_urb. 366 */ 367 368 static int digi_write_oob_command(struct usb_serial_port *port, 369 unsigned char *buf, int count, int interruptible) 370 { 371 int ret = 0; 372 int len; 373 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 374 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 375 unsigned long flags; 376 377 dev_dbg(&port->dev, 378 "digi_write_oob_command: TOP: port=%d, count=%d\n", 379 oob_priv->dp_port_num, count); 380 381 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 382 while (count > 0) { 383 while (oob_priv->dp_write_urb_in_use) { 384 cond_wait_interruptible_timeout_irqrestore( 385 &oob_priv->write_wait, DIGI_RETRY_TIMEOUT, 386 &oob_priv->dp_port_lock, flags); 387 if (interruptible && signal_pending(current)) 388 return -EINTR; 389 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 390 } 391 392 /* len must be a multiple of 4, so commands are not split */ 393 len = min(count, oob_port->bulk_out_size); 394 if (len > 4) 395 len &= ~3; 396 memcpy(oob_port->write_urb->transfer_buffer, buf, len); 397 oob_port->write_urb->transfer_buffer_length = len; 398 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); 399 if (ret == 0) { 400 oob_priv->dp_write_urb_in_use = 1; 401 count -= len; 402 buf += len; 403 } 404 } 405 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); 406 if (ret) 407 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", 408 __func__, ret); 409 return ret; 410 411 } 412 413 414 /* 415 * Digi Write In Band Command 416 * 417 * Write commands on the given port. Commands are 4 418 * bytes each, multiple commands can be sent at once, and 419 * no command will be split across USB packets. If timeout 420 * is non-zero, write in band command will return after 421 * waiting unsuccessfully for the URB status to clear for 422 * timeout ticks. Returns 0 if successful, or a negative 423 * error returned by digi_write. 424 */ 425 426 static int digi_write_inb_command(struct usb_serial_port *port, 427 unsigned char *buf, int count, unsigned long timeout) 428 { 429 int ret = 0; 430 int len; 431 struct digi_port *priv = usb_get_serial_port_data(port); 432 unsigned char *data = port->write_urb->transfer_buffer; 433 unsigned long flags; 434 435 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n", 436 priv->dp_port_num, count); 437 438 if (timeout) 439 timeout += jiffies; 440 else 441 timeout = ULONG_MAX; 442 443 spin_lock_irqsave(&priv->dp_port_lock, flags); 444 while (count > 0 && ret == 0) { 445 while (priv->dp_write_urb_in_use && 446 time_before(jiffies, timeout)) { 447 cond_wait_interruptible_timeout_irqrestore( 448 &priv->write_wait, DIGI_RETRY_TIMEOUT, 449 &priv->dp_port_lock, flags); 450 if (signal_pending(current)) 451 return -EINTR; 452 spin_lock_irqsave(&priv->dp_port_lock, flags); 453 } 454 455 /* len must be a multiple of 4 and small enough to */ 456 /* guarantee the write will send buffered data first, */ 457 /* so commands are in order with data and not split */ 458 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 459 if (len > 4) 460 len &= ~3; 461 462 /* write any buffered data first */ 463 if (priv->dp_out_buf_len > 0) { 464 data[0] = DIGI_CMD_SEND_DATA; 465 data[1] = priv->dp_out_buf_len; 466 memcpy(data + 2, priv->dp_out_buf, 467 priv->dp_out_buf_len); 468 memcpy(data + 2 + priv->dp_out_buf_len, buf, len); 469 port->write_urb->transfer_buffer_length 470 = priv->dp_out_buf_len + 2 + len; 471 } else { 472 memcpy(data, buf, len); 473 port->write_urb->transfer_buffer_length = len; 474 } 475 476 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 477 if (ret == 0) { 478 priv->dp_write_urb_in_use = 1; 479 priv->dp_out_buf_len = 0; 480 count -= len; 481 buf += len; 482 } 483 484 } 485 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 486 487 if (ret) 488 dev_err(&port->dev, 489 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 490 __func__, ret, priv->dp_port_num); 491 return ret; 492 } 493 494 495 /* 496 * Digi Set Modem Signals 497 * 498 * Sets or clears DTR and RTS on the port, according to the 499 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags 500 * for the modem_signals argument. Returns 0 if successful, 501 * -EINTR if interrupted while sleeping, or a non-zero error 502 * returned by usb_submit_urb. 503 */ 504 505 static int digi_set_modem_signals(struct usb_serial_port *port, 506 unsigned int modem_signals, int interruptible) 507 { 508 509 int ret; 510 struct digi_port *port_priv = usb_get_serial_port_data(port); 511 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; 512 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); 513 unsigned char *data = oob_port->write_urb->transfer_buffer; 514 unsigned long flags; 515 516 dev_dbg(&port->dev, 517 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n", 518 port_priv->dp_port_num, modem_signals); 519 520 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 521 spin_lock(&port_priv->dp_port_lock); 522 523 while (oob_priv->dp_write_urb_in_use) { 524 spin_unlock(&port_priv->dp_port_lock); 525 cond_wait_interruptible_timeout_irqrestore( 526 &oob_priv->write_wait, DIGI_RETRY_TIMEOUT, 527 &oob_priv->dp_port_lock, flags); 528 if (interruptible && signal_pending(current)) 529 return -EINTR; 530 spin_lock_irqsave(&oob_priv->dp_port_lock, flags); 531 spin_lock(&port_priv->dp_port_lock); 532 } 533 data[0] = DIGI_CMD_SET_DTR_SIGNAL; 534 data[1] = port_priv->dp_port_num; 535 data[2] = (modem_signals & TIOCM_DTR) ? 536 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; 537 data[3] = 0; 538 data[4] = DIGI_CMD_SET_RTS_SIGNAL; 539 data[5] = port_priv->dp_port_num; 540 data[6] = (modem_signals & TIOCM_RTS) ? 541 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; 542 data[7] = 0; 543 544 oob_port->write_urb->transfer_buffer_length = 8; 545 546 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); 547 if (ret == 0) { 548 oob_priv->dp_write_urb_in_use = 1; 549 port_priv->dp_modem_signals &= ~(TIOCM_DTR | TIOCM_RTS); 550 port_priv->dp_modem_signals |= 551 modem_signals & (TIOCM_DTR | TIOCM_RTS); 552 } 553 spin_unlock(&port_priv->dp_port_lock); 554 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); 555 if (ret) 556 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", 557 __func__, ret); 558 return ret; 559 } 560 561 /* 562 * Digi Transmit Idle 563 * 564 * Digi transmit idle waits, up to timeout ticks, for the transmitter 565 * to go idle. It returns 0 if successful or a negative error. 566 * 567 * There are race conditions here if more than one process is calling 568 * digi_transmit_idle on the same port at the same time. However, this 569 * is only called from close, and only one process can be in close on a 570 * port at a time, so its ok. 571 */ 572 573 static int digi_transmit_idle(struct usb_serial_port *port, 574 unsigned long timeout) 575 { 576 int ret; 577 unsigned char buf[2]; 578 struct digi_port *priv = usb_get_serial_port_data(port); 579 unsigned long flags; 580 581 spin_lock_irqsave(&priv->dp_port_lock, flags); 582 priv->dp_transmit_idle = 0; 583 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 584 585 buf[0] = DIGI_CMD_TRANSMIT_IDLE; 586 buf[1] = 0; 587 588 timeout += jiffies; 589 590 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies); 591 if (ret != 0) 592 return ret; 593 594 spin_lock_irqsave(&priv->dp_port_lock, flags); 595 596 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) { 597 cond_wait_interruptible_timeout_irqrestore( 598 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, 599 &priv->dp_port_lock, flags); 600 if (signal_pending(current)) 601 return -EINTR; 602 spin_lock_irqsave(&priv->dp_port_lock, flags); 603 } 604 priv->dp_transmit_idle = 0; 605 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 606 return 0; 607 608 } 609 610 611 static void digi_rx_throttle(struct tty_struct *tty) 612 { 613 unsigned long flags; 614 struct usb_serial_port *port = tty->driver_data; 615 struct digi_port *priv = usb_get_serial_port_data(port); 616 617 /* stop receiving characters by not resubmitting the read urb */ 618 spin_lock_irqsave(&priv->dp_port_lock, flags); 619 priv->dp_throttled = 1; 620 priv->dp_throttle_restart = 0; 621 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 622 } 623 624 625 static void digi_rx_unthrottle(struct tty_struct *tty) 626 { 627 int ret = 0; 628 unsigned long flags; 629 struct usb_serial_port *port = tty->driver_data; 630 struct digi_port *priv = usb_get_serial_port_data(port); 631 632 spin_lock_irqsave(&priv->dp_port_lock, flags); 633 634 /* restart read chain */ 635 if (priv->dp_throttle_restart) 636 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC); 637 638 /* turn throttle off */ 639 priv->dp_throttled = 0; 640 priv->dp_throttle_restart = 0; 641 642 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 643 644 if (ret) 645 dev_err(&port->dev, 646 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 647 __func__, ret, priv->dp_port_num); 648 } 649 650 651 static void digi_set_termios(struct tty_struct *tty, 652 struct usb_serial_port *port, struct ktermios *old_termios) 653 { 654 struct digi_port *priv = usb_get_serial_port_data(port); 655 struct device *dev = &port->dev; 656 unsigned int iflag = tty->termios.c_iflag; 657 unsigned int cflag = tty->termios.c_cflag; 658 unsigned int old_iflag = old_termios->c_iflag; 659 unsigned int old_cflag = old_termios->c_cflag; 660 unsigned char buf[32]; 661 unsigned int modem_signals; 662 int arg, ret; 663 int i = 0; 664 speed_t baud; 665 666 dev_dbg(dev, 667 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n", 668 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag); 669 670 /* set baud rate */ 671 baud = tty_get_baud_rate(tty); 672 if (baud != tty_termios_baud_rate(old_termios)) { 673 arg = -1; 674 675 /* reassert DTR and (maybe) RTS on transition from B0 */ 676 if ((old_cflag & CBAUD) == B0) { 677 /* don't set RTS if using hardware flow control */ 678 /* and throttling input */ 679 modem_signals = TIOCM_DTR; 680 if (!C_CRTSCTS(tty) || !tty_throttled(tty)) 681 modem_signals |= TIOCM_RTS; 682 digi_set_modem_signals(port, modem_signals, 1); 683 } 684 switch (baud) { 685 /* drop DTR and RTS on transition to B0 */ 686 case 0: digi_set_modem_signals(port, 0, 1); break; 687 case 50: arg = DIGI_BAUD_50; break; 688 case 75: arg = DIGI_BAUD_75; break; 689 case 110: arg = DIGI_BAUD_110; break; 690 case 150: arg = DIGI_BAUD_150; break; 691 case 200: arg = DIGI_BAUD_200; break; 692 case 300: arg = DIGI_BAUD_300; break; 693 case 600: arg = DIGI_BAUD_600; break; 694 case 1200: arg = DIGI_BAUD_1200; break; 695 case 1800: arg = DIGI_BAUD_1800; break; 696 case 2400: arg = DIGI_BAUD_2400; break; 697 case 4800: arg = DIGI_BAUD_4800; break; 698 case 9600: arg = DIGI_BAUD_9600; break; 699 case 19200: arg = DIGI_BAUD_19200; break; 700 case 38400: arg = DIGI_BAUD_38400; break; 701 case 57600: arg = DIGI_BAUD_57600; break; 702 case 115200: arg = DIGI_BAUD_115200; break; 703 case 230400: arg = DIGI_BAUD_230400; break; 704 case 460800: arg = DIGI_BAUD_460800; break; 705 default: 706 arg = DIGI_BAUD_9600; 707 baud = 9600; 708 break; 709 } 710 if (arg != -1) { 711 buf[i++] = DIGI_CMD_SET_BAUD_RATE; 712 buf[i++] = priv->dp_port_num; 713 buf[i++] = arg; 714 buf[i++] = 0; 715 } 716 } 717 /* set parity */ 718 tty->termios.c_cflag &= ~CMSPAR; 719 720 if ((cflag & (PARENB | PARODD)) != (old_cflag & (PARENB | PARODD))) { 721 if (cflag & PARENB) { 722 if (cflag & PARODD) 723 arg = DIGI_PARITY_ODD; 724 else 725 arg = DIGI_PARITY_EVEN; 726 } else { 727 arg = DIGI_PARITY_NONE; 728 } 729 buf[i++] = DIGI_CMD_SET_PARITY; 730 buf[i++] = priv->dp_port_num; 731 buf[i++] = arg; 732 buf[i++] = 0; 733 } 734 /* set word size */ 735 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 736 arg = -1; 737 switch (cflag & CSIZE) { 738 case CS5: arg = DIGI_WORD_SIZE_5; break; 739 case CS6: arg = DIGI_WORD_SIZE_6; break; 740 case CS7: arg = DIGI_WORD_SIZE_7; break; 741 case CS8: arg = DIGI_WORD_SIZE_8; break; 742 default: 743 dev_dbg(dev, 744 "digi_set_termios: can't handle word size %d\n", 745 cflag & CSIZE); 746 break; 747 } 748 749 if (arg != -1) { 750 buf[i++] = DIGI_CMD_SET_WORD_SIZE; 751 buf[i++] = priv->dp_port_num; 752 buf[i++] = arg; 753 buf[i++] = 0; 754 } 755 756 } 757 758 /* set stop bits */ 759 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 760 761 if ((cflag & CSTOPB)) 762 arg = DIGI_STOP_BITS_2; 763 else 764 arg = DIGI_STOP_BITS_1; 765 766 buf[i++] = DIGI_CMD_SET_STOP_BITS; 767 buf[i++] = priv->dp_port_num; 768 buf[i++] = arg; 769 buf[i++] = 0; 770 771 } 772 773 /* set input flow control */ 774 if ((iflag & IXOFF) != (old_iflag & IXOFF) || 775 (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 776 arg = 0; 777 if (iflag & IXOFF) 778 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 779 else 780 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; 781 782 if (cflag & CRTSCTS) { 783 arg |= DIGI_INPUT_FLOW_CONTROL_RTS; 784 785 /* On USB-4 it is necessary to assert RTS prior */ 786 /* to selecting RTS input flow control. */ 787 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; 788 buf[i++] = priv->dp_port_num; 789 buf[i++] = DIGI_RTS_ACTIVE; 790 buf[i++] = 0; 791 792 } else { 793 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; 794 } 795 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 796 buf[i++] = priv->dp_port_num; 797 buf[i++] = arg; 798 buf[i++] = 0; 799 } 800 801 /* set output flow control */ 802 if ((iflag & IXON) != (old_iflag & IXON) || 803 (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 804 arg = 0; 805 if (iflag & IXON) 806 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 807 else 808 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; 809 810 if (cflag & CRTSCTS) 811 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; 812 else 813 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; 814 815 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 816 buf[i++] = priv->dp_port_num; 817 buf[i++] = arg; 818 buf[i++] = 0; 819 } 820 821 /* set receive enable/disable */ 822 if ((cflag & CREAD) != (old_cflag & CREAD)) { 823 if (cflag & CREAD) 824 arg = DIGI_ENABLE; 825 else 826 arg = DIGI_DISABLE; 827 828 buf[i++] = DIGI_CMD_RECEIVE_ENABLE; 829 buf[i++] = priv->dp_port_num; 830 buf[i++] = arg; 831 buf[i++] = 0; 832 } 833 ret = digi_write_oob_command(port, buf, i, 1); 834 if (ret != 0) 835 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret); 836 tty_encode_baud_rate(tty, baud, baud); 837 } 838 839 840 static void digi_break_ctl(struct tty_struct *tty, int break_state) 841 { 842 struct usb_serial_port *port = tty->driver_data; 843 unsigned char buf[4]; 844 845 buf[0] = DIGI_CMD_BREAK_CONTROL; 846 buf[1] = 2; /* length */ 847 buf[2] = break_state ? 1 : 0; 848 buf[3] = 0; /* pad */ 849 digi_write_inb_command(port, buf, 4, 0); 850 } 851 852 853 static int digi_tiocmget(struct tty_struct *tty) 854 { 855 struct usb_serial_port *port = tty->driver_data; 856 struct digi_port *priv = usb_get_serial_port_data(port); 857 unsigned int val; 858 unsigned long flags; 859 860 spin_lock_irqsave(&priv->dp_port_lock, flags); 861 val = priv->dp_modem_signals; 862 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 863 return val; 864 } 865 866 867 static int digi_tiocmset(struct tty_struct *tty, 868 unsigned int set, unsigned int clear) 869 { 870 struct usb_serial_port *port = tty->driver_data; 871 struct digi_port *priv = usb_get_serial_port_data(port); 872 unsigned int val; 873 unsigned long flags; 874 875 spin_lock_irqsave(&priv->dp_port_lock, flags); 876 val = (priv->dp_modem_signals & ~clear) | set; 877 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 878 return digi_set_modem_signals(port, val, 1); 879 } 880 881 882 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, 883 const unsigned char *buf, int count) 884 { 885 886 int ret, data_len, new_len; 887 struct digi_port *priv = usb_get_serial_port_data(port); 888 unsigned char *data = port->write_urb->transfer_buffer; 889 unsigned long flags; 890 891 dev_dbg(&port->dev, "digi_write: TOP: port=%d, count=%d\n", 892 priv->dp_port_num, count); 893 894 /* copy user data (which can sleep) before getting spin lock */ 895 count = min(count, port->bulk_out_size-2); 896 count = min(64, count); 897 898 /* be sure only one write proceeds at a time */ 899 /* there are races on the port private buffer */ 900 spin_lock_irqsave(&priv->dp_port_lock, flags); 901 902 /* wait for urb status clear to submit another urb */ 903 if (priv->dp_write_urb_in_use) { 904 /* buffer data if count is 1 (probably put_char) if possible */ 905 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) { 906 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; 907 new_len = 1; 908 } else { 909 new_len = 0; 910 } 911 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 912 return new_len; 913 } 914 915 /* allow space for any buffered data and for new data, up to */ 916 /* transfer buffer size - 2 (for command and length bytes) */ 917 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); 918 data_len = new_len + priv->dp_out_buf_len; 919 920 if (data_len == 0) { 921 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 922 return 0; 923 } 924 925 port->write_urb->transfer_buffer_length = data_len+2; 926 927 *data++ = DIGI_CMD_SEND_DATA; 928 *data++ = data_len; 929 930 /* copy in buffered data first */ 931 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len); 932 data += priv->dp_out_buf_len; 933 934 /* copy in new data */ 935 memcpy(data, buf, new_len); 936 937 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 938 if (ret == 0) { 939 priv->dp_write_urb_in_use = 1; 940 ret = new_len; 941 priv->dp_out_buf_len = 0; 942 } 943 944 /* return length of new data written, or error */ 945 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 946 if (ret < 0) 947 dev_err_console(port, 948 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 949 __func__, ret, priv->dp_port_num); 950 dev_dbg(&port->dev, "digi_write: returning %d\n", ret); 951 return ret; 952 953 } 954 955 static void digi_write_bulk_callback(struct urb *urb) 956 { 957 958 struct usb_serial_port *port = urb->context; 959 struct usb_serial *serial; 960 struct digi_port *priv; 961 struct digi_serial *serial_priv; 962 unsigned long flags; 963 int ret = 0; 964 int status = urb->status; 965 bool wakeup; 966 967 /* port and serial sanity check */ 968 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) { 969 pr_err("%s: port or port->private is NULL, status=%d\n", 970 __func__, status); 971 return; 972 } 973 serial = port->serial; 974 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) { 975 dev_err(&port->dev, 976 "%s: serial or serial->private is NULL, status=%d\n", 977 __func__, status); 978 return; 979 } 980 981 /* handle oob callback */ 982 if (priv->dp_port_num == serial_priv->ds_oob_port_num) { 983 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n"); 984 spin_lock_irqsave(&priv->dp_port_lock, flags); 985 priv->dp_write_urb_in_use = 0; 986 wake_up_interruptible(&priv->write_wait); 987 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 988 return; 989 } 990 991 /* try to send any buffered data on this port */ 992 wakeup = true; 993 spin_lock_irqsave(&priv->dp_port_lock, flags); 994 priv->dp_write_urb_in_use = 0; 995 if (priv->dp_out_buf_len > 0) { 996 *((unsigned char *)(port->write_urb->transfer_buffer)) 997 = (unsigned char)DIGI_CMD_SEND_DATA; 998 *((unsigned char *)(port->write_urb->transfer_buffer) + 1) 999 = (unsigned char)priv->dp_out_buf_len; 1000 port->write_urb->transfer_buffer_length = 1001 priv->dp_out_buf_len + 2; 1002 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf, 1003 priv->dp_out_buf_len); 1004 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); 1005 if (ret == 0) { 1006 priv->dp_write_urb_in_use = 1; 1007 priv->dp_out_buf_len = 0; 1008 wakeup = false; 1009 } 1010 } 1011 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1012 1013 if (ret && ret != -EPERM) 1014 dev_err_console(port, 1015 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1016 __func__, ret, priv->dp_port_num); 1017 1018 if (wakeup) 1019 tty_port_tty_wakeup(&port->port); 1020 } 1021 1022 static unsigned int digi_write_room(struct tty_struct *tty) 1023 { 1024 struct usb_serial_port *port = tty->driver_data; 1025 struct digi_port *priv = usb_get_serial_port_data(port); 1026 unsigned long flags; 1027 unsigned int room; 1028 1029 spin_lock_irqsave(&priv->dp_port_lock, flags); 1030 1031 if (priv->dp_write_urb_in_use) 1032 room = 0; 1033 else 1034 room = port->bulk_out_size - 2 - priv->dp_out_buf_len; 1035 1036 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1037 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%u\n", priv->dp_port_num, room); 1038 return room; 1039 1040 } 1041 1042 static unsigned int digi_chars_in_buffer(struct tty_struct *tty) 1043 { 1044 struct usb_serial_port *port = tty->driver_data; 1045 struct digi_port *priv = usb_get_serial_port_data(port); 1046 unsigned long flags; 1047 unsigned int chars; 1048 1049 spin_lock_irqsave(&priv->dp_port_lock, flags); 1050 if (priv->dp_write_urb_in_use) 1051 chars = port->bulk_out_size - 2; 1052 else 1053 chars = priv->dp_out_buf_len; 1054 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1055 1056 dev_dbg(&port->dev, "%s: port=%d, chars=%d\n", __func__, 1057 priv->dp_port_num, chars); 1058 return chars; 1059 } 1060 1061 static void digi_dtr_rts(struct usb_serial_port *port, int on) 1062 { 1063 /* Adjust DTR and RTS */ 1064 digi_set_modem_signals(port, on * (TIOCM_DTR | TIOCM_RTS), 1); 1065 } 1066 1067 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port) 1068 { 1069 int ret; 1070 unsigned char buf[32]; 1071 struct digi_port *priv = usb_get_serial_port_data(port); 1072 struct ktermios not_termios; 1073 1074 /* be sure the device is started up */ 1075 if (digi_startup_device(port->serial) != 0) 1076 return -ENXIO; 1077 1078 /* read modem signals automatically whenever they change */ 1079 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; 1080 buf[1] = priv->dp_port_num; 1081 buf[2] = DIGI_ENABLE; 1082 buf[3] = 0; 1083 1084 /* flush fifos */ 1085 buf[4] = DIGI_CMD_IFLUSH_FIFO; 1086 buf[5] = priv->dp_port_num; 1087 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1088 buf[7] = 0; 1089 1090 ret = digi_write_oob_command(port, buf, 8, 1); 1091 if (ret != 0) 1092 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret); 1093 1094 /* set termios settings */ 1095 if (tty) { 1096 not_termios.c_cflag = ~tty->termios.c_cflag; 1097 not_termios.c_iflag = ~tty->termios.c_iflag; 1098 digi_set_termios(tty, port, ¬_termios); 1099 } 1100 return 0; 1101 } 1102 1103 1104 static void digi_close(struct usb_serial_port *port) 1105 { 1106 DEFINE_WAIT(wait); 1107 int ret; 1108 unsigned char buf[32]; 1109 struct digi_port *priv = usb_get_serial_port_data(port); 1110 1111 mutex_lock(&port->serial->disc_mutex); 1112 /* if disconnected, just clear flags */ 1113 if (port->serial->disconnected) 1114 goto exit; 1115 1116 /* FIXME: Transmit idle belongs in the wait_unti_sent path */ 1117 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT); 1118 1119 /* disable input flow control */ 1120 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; 1121 buf[1] = priv->dp_port_num; 1122 buf[2] = DIGI_DISABLE; 1123 buf[3] = 0; 1124 1125 /* disable output flow control */ 1126 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; 1127 buf[5] = priv->dp_port_num; 1128 buf[6] = DIGI_DISABLE; 1129 buf[7] = 0; 1130 1131 /* disable reading modem signals automatically */ 1132 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; 1133 buf[9] = priv->dp_port_num; 1134 buf[10] = DIGI_DISABLE; 1135 buf[11] = 0; 1136 1137 /* disable receive */ 1138 buf[12] = DIGI_CMD_RECEIVE_ENABLE; 1139 buf[13] = priv->dp_port_num; 1140 buf[14] = DIGI_DISABLE; 1141 buf[15] = 0; 1142 1143 /* flush fifos */ 1144 buf[16] = DIGI_CMD_IFLUSH_FIFO; 1145 buf[17] = priv->dp_port_num; 1146 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; 1147 buf[19] = 0; 1148 1149 ret = digi_write_oob_command(port, buf, 20, 0); 1150 if (ret != 0) 1151 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n", 1152 ret); 1153 /* wait for final commands on oob port to complete */ 1154 prepare_to_wait(&priv->dp_flush_wait, &wait, 1155 TASK_INTERRUPTIBLE); 1156 schedule_timeout(DIGI_CLOSE_TIMEOUT); 1157 finish_wait(&priv->dp_flush_wait, &wait); 1158 1159 /* shutdown any outstanding bulk writes */ 1160 usb_kill_urb(port->write_urb); 1161 exit: 1162 spin_lock_irq(&priv->dp_port_lock); 1163 priv->dp_write_urb_in_use = 0; 1164 wake_up_interruptible(&priv->dp_close_wait); 1165 spin_unlock_irq(&priv->dp_port_lock); 1166 mutex_unlock(&port->serial->disc_mutex); 1167 } 1168 1169 1170 /* 1171 * Digi Startup Device 1172 * 1173 * Starts reads on all ports. Must be called AFTER startup, with 1174 * urbs initialized. Returns 0 if successful, non-zero error otherwise. 1175 */ 1176 1177 static int digi_startup_device(struct usb_serial *serial) 1178 { 1179 int i, ret = 0; 1180 struct digi_serial *serial_priv = usb_get_serial_data(serial); 1181 struct usb_serial_port *port; 1182 1183 /* be sure this happens exactly once */ 1184 spin_lock(&serial_priv->ds_serial_lock); 1185 if (serial_priv->ds_device_started) { 1186 spin_unlock(&serial_priv->ds_serial_lock); 1187 return 0; 1188 } 1189 serial_priv->ds_device_started = 1; 1190 spin_unlock(&serial_priv->ds_serial_lock); 1191 1192 /* start reading from each bulk in endpoint for the device */ 1193 /* set USB_DISABLE_SPD flag for write bulk urbs */ 1194 for (i = 0; i < serial->type->num_ports + 1; i++) { 1195 port = serial->port[i]; 1196 ret = usb_submit_urb(port->read_urb, GFP_KERNEL); 1197 if (ret != 0) { 1198 dev_err(&port->dev, 1199 "%s: usb_submit_urb failed, ret=%d, port=%d\n", 1200 __func__, ret, i); 1201 break; 1202 } 1203 } 1204 return ret; 1205 } 1206 1207 static int digi_port_init(struct usb_serial_port *port, unsigned port_num) 1208 { 1209 struct digi_port *priv; 1210 1211 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1212 if (!priv) 1213 return -ENOMEM; 1214 1215 spin_lock_init(&priv->dp_port_lock); 1216 priv->dp_port_num = port_num; 1217 init_waitqueue_head(&priv->dp_transmit_idle_wait); 1218 init_waitqueue_head(&priv->dp_flush_wait); 1219 init_waitqueue_head(&priv->dp_close_wait); 1220 init_waitqueue_head(&priv->write_wait); 1221 priv->dp_port = port; 1222 1223 usb_set_serial_port_data(port, priv); 1224 1225 return 0; 1226 } 1227 1228 static int digi_startup(struct usb_serial *serial) 1229 { 1230 struct digi_serial *serial_priv; 1231 int ret; 1232 1233 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 1234 if (!serial_priv) 1235 return -ENOMEM; 1236 1237 spin_lock_init(&serial_priv->ds_serial_lock); 1238 serial_priv->ds_oob_port_num = serial->type->num_ports; 1239 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; 1240 1241 ret = digi_port_init(serial_priv->ds_oob_port, 1242 serial_priv->ds_oob_port_num); 1243 if (ret) { 1244 kfree(serial_priv); 1245 return ret; 1246 } 1247 1248 usb_set_serial_data(serial, serial_priv); 1249 1250 return 0; 1251 } 1252 1253 1254 static void digi_disconnect(struct usb_serial *serial) 1255 { 1256 int i; 1257 1258 /* stop reads and writes on all ports */ 1259 for (i = 0; i < serial->type->num_ports + 1; i++) { 1260 usb_kill_urb(serial->port[i]->read_urb); 1261 usb_kill_urb(serial->port[i]->write_urb); 1262 } 1263 } 1264 1265 1266 static void digi_release(struct usb_serial *serial) 1267 { 1268 struct digi_serial *serial_priv; 1269 struct digi_port *priv; 1270 1271 serial_priv = usb_get_serial_data(serial); 1272 1273 priv = usb_get_serial_port_data(serial_priv->ds_oob_port); 1274 kfree(priv); 1275 1276 kfree(serial_priv); 1277 } 1278 1279 static int digi_port_probe(struct usb_serial_port *port) 1280 { 1281 return digi_port_init(port, port->port_number); 1282 } 1283 1284 static void digi_port_remove(struct usb_serial_port *port) 1285 { 1286 struct digi_port *priv; 1287 1288 priv = usb_get_serial_port_data(port); 1289 kfree(priv); 1290 } 1291 1292 static void digi_read_bulk_callback(struct urb *urb) 1293 { 1294 struct usb_serial_port *port = urb->context; 1295 struct digi_port *priv; 1296 struct digi_serial *serial_priv; 1297 int ret; 1298 int status = urb->status; 1299 1300 /* port sanity check, do not resubmit if port is not valid */ 1301 if (port == NULL) 1302 return; 1303 priv = usb_get_serial_port_data(port); 1304 if (priv == NULL) { 1305 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n", 1306 __func__, status); 1307 return; 1308 } 1309 if (port->serial == NULL || 1310 (serial_priv = usb_get_serial_data(port->serial)) == NULL) { 1311 dev_err(&port->dev, "%s: serial is bad or serial->private " 1312 "is NULL, status=%d\n", __func__, status); 1313 return; 1314 } 1315 1316 /* do not resubmit urb if it has any status error */ 1317 if (status) { 1318 dev_err(&port->dev, 1319 "%s: nonzero read bulk status: status=%d, port=%d\n", 1320 __func__, status, priv->dp_port_num); 1321 return; 1322 } 1323 1324 /* handle oob or inb callback, do not resubmit if error */ 1325 if (priv->dp_port_num == serial_priv->ds_oob_port_num) { 1326 if (digi_read_oob_callback(urb) != 0) 1327 return; 1328 } else { 1329 if (digi_read_inb_callback(urb) != 0) 1330 return; 1331 } 1332 1333 /* continue read */ 1334 ret = usb_submit_urb(urb, GFP_ATOMIC); 1335 if (ret != 0 && ret != -EPERM) { 1336 dev_err(&port->dev, 1337 "%s: failed resubmitting urb, ret=%d, port=%d\n", 1338 __func__, ret, priv->dp_port_num); 1339 } 1340 1341 } 1342 1343 /* 1344 * Digi Read INB Callback 1345 * 1346 * Digi Read INB Callback handles reads on the in band ports, sending 1347 * the data on to the tty subsystem. When called we know port and 1348 * port->private are not NULL and port->serial has been validated. 1349 * It returns 0 if successful, 1 if successful but the port is 1350 * throttled, and -1 if the sanity checks failed. 1351 */ 1352 1353 static int digi_read_inb_callback(struct urb *urb) 1354 { 1355 struct usb_serial_port *port = urb->context; 1356 struct digi_port *priv = usb_get_serial_port_data(port); 1357 unsigned char *buf = urb->transfer_buffer; 1358 unsigned long flags; 1359 int opcode; 1360 int len; 1361 int port_status; 1362 unsigned char *data; 1363 int tty_flag, throttled; 1364 1365 /* short/multiple packet check */ 1366 if (urb->actual_length < 2) { 1367 dev_warn(&port->dev, "short packet received\n"); 1368 return -1; 1369 } 1370 1371 opcode = buf[0]; 1372 len = buf[1]; 1373 1374 if (urb->actual_length != len + 2) { 1375 dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n", 1376 priv->dp_port_num, opcode, len, urb->actual_length); 1377 return -1; 1378 } 1379 1380 if (opcode == DIGI_CMD_RECEIVE_DATA && len < 1) { 1381 dev_err(&port->dev, "malformed data packet received\n"); 1382 return -1; 1383 } 1384 1385 spin_lock_irqsave(&priv->dp_port_lock, flags); 1386 1387 /* check for throttle; if set, do not resubmit read urb */ 1388 /* indicate the read chain needs to be restarted on unthrottle */ 1389 throttled = priv->dp_throttled; 1390 if (throttled) 1391 priv->dp_throttle_restart = 1; 1392 1393 /* receive data */ 1394 if (opcode == DIGI_CMD_RECEIVE_DATA) { 1395 port_status = buf[2]; 1396 data = &buf[3]; 1397 1398 /* get flag from port_status */ 1399 tty_flag = 0; 1400 1401 /* overrun is special, not associated with a char */ 1402 if (port_status & DIGI_OVERRUN_ERROR) 1403 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 1404 1405 /* break takes precedence over parity, */ 1406 /* which takes precedence over framing errors */ 1407 if (port_status & DIGI_BREAK_ERROR) 1408 tty_flag = TTY_BREAK; 1409 else if (port_status & DIGI_PARITY_ERROR) 1410 tty_flag = TTY_PARITY; 1411 else if (port_status & DIGI_FRAMING_ERROR) 1412 tty_flag = TTY_FRAME; 1413 1414 /* data length is len-1 (one byte of len is port_status) */ 1415 --len; 1416 if (len > 0) { 1417 tty_insert_flip_string_fixed_flag(&port->port, data, 1418 tty_flag, len); 1419 tty_flip_buffer_push(&port->port); 1420 } 1421 } 1422 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1423 1424 if (opcode == DIGI_CMD_RECEIVE_DISABLE) 1425 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__); 1426 else if (opcode != DIGI_CMD_RECEIVE_DATA) 1427 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode); 1428 1429 return throttled ? 1 : 0; 1430 1431 } 1432 1433 1434 /* 1435 * Digi Read OOB Callback 1436 * 1437 * Digi Read OOB Callback handles reads on the out of band port. 1438 * When called we know port and port->private are not NULL and 1439 * the port->serial is valid. It returns 0 if successful, and 1440 * -1 if the sanity checks failed. 1441 */ 1442 1443 static int digi_read_oob_callback(struct urb *urb) 1444 { 1445 1446 struct usb_serial_port *port = urb->context; 1447 struct usb_serial *serial = port->serial; 1448 struct tty_struct *tty; 1449 struct digi_port *priv; 1450 unsigned char *buf = urb->transfer_buffer; 1451 int opcode, line, status, val; 1452 unsigned long flags; 1453 int i; 1454 unsigned int rts; 1455 1456 if (urb->actual_length < 4) 1457 return -1; 1458 1459 /* handle each oob command */ 1460 for (i = 0; i < urb->actual_length - 3; i += 4) { 1461 opcode = buf[i]; 1462 line = buf[i + 1]; 1463 status = buf[i + 2]; 1464 val = buf[i + 3]; 1465 1466 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n", 1467 opcode, line, status, val); 1468 1469 if (status != 0 || line >= serial->type->num_ports) 1470 continue; 1471 1472 port = serial->port[line]; 1473 1474 priv = usb_get_serial_port_data(port); 1475 if (priv == NULL) 1476 return -1; 1477 1478 tty = tty_port_tty_get(&port->port); 1479 1480 rts = 0; 1481 if (tty) 1482 rts = C_CRTSCTS(tty); 1483 1484 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) { 1485 bool wakeup = false; 1486 1487 spin_lock_irqsave(&priv->dp_port_lock, flags); 1488 /* convert from digi flags to termiox flags */ 1489 if (val & DIGI_READ_INPUT_SIGNALS_CTS) { 1490 priv->dp_modem_signals |= TIOCM_CTS; 1491 if (rts) 1492 wakeup = true; 1493 } else { 1494 priv->dp_modem_signals &= ~TIOCM_CTS; 1495 /* port must be open to use tty struct */ 1496 } 1497 if (val & DIGI_READ_INPUT_SIGNALS_DSR) 1498 priv->dp_modem_signals |= TIOCM_DSR; 1499 else 1500 priv->dp_modem_signals &= ~TIOCM_DSR; 1501 if (val & DIGI_READ_INPUT_SIGNALS_RI) 1502 priv->dp_modem_signals |= TIOCM_RI; 1503 else 1504 priv->dp_modem_signals &= ~TIOCM_RI; 1505 if (val & DIGI_READ_INPUT_SIGNALS_DCD) 1506 priv->dp_modem_signals |= TIOCM_CD; 1507 else 1508 priv->dp_modem_signals &= ~TIOCM_CD; 1509 1510 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1511 1512 if (wakeup) 1513 tty_port_tty_wakeup(&port->port); 1514 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) { 1515 spin_lock_irqsave(&priv->dp_port_lock, flags); 1516 priv->dp_transmit_idle = 1; 1517 wake_up_interruptible(&priv->dp_transmit_idle_wait); 1518 spin_unlock_irqrestore(&priv->dp_port_lock, flags); 1519 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) { 1520 wake_up_interruptible(&priv->dp_flush_wait); 1521 } 1522 tty_kref_put(tty); 1523 } 1524 return 0; 1525 1526 } 1527 1528 module_usb_serial_driver(serial_drivers, id_table_combined); 1529 1530 MODULE_AUTHOR(DRIVER_AUTHOR); 1531 MODULE_DESCRIPTION(DRIVER_DESC); 1532 MODULE_LICENSE("GPL"); 1533