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pty: Repair TIOCGPTPEER
[cris-mirror.git] / drivers / usb / serial / digi_acceleport.c
blob2ce39af32cfa614c2b7ccd26d2df1581cfc89c16
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/slab.h>
21 #include <linux/tty.h>
22 #include <linux/tty_driver.h>
23 #include <linux/tty_flip.h>
24 #include <linux/module.h>
25 #include <linux/spinlock.h>
26 #include <linux/workqueue.h>
27 #include <linux/uaccess.h>
28 #include <linux/usb.h>
29 #include <linux/wait.h>
30 #include <linux/sched/signal.h>
31 #include <linux/usb/serial.h>
32
33 /* Defines */
34
35 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
36 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
37
38 /* port output buffer length -- must be <= transfer buffer length - 2 */
39 /* so we can be sure to send the full buffer in one urb */
40 #define DIGI_OUT_BUF_SIZE 8
41
42 /* port input buffer length -- must be >= transfer buffer length - 3 */
43 /* so we can be sure to hold at least one full buffer from one urb */
44 #define DIGI_IN_BUF_SIZE 64
45
46 /* retry timeout while sleeping */
47 #define DIGI_RETRY_TIMEOUT (HZ/10)
48
49 /* timeout while waiting for tty output to drain in close */
50 /* this delay is used twice in close, so the total delay could */
51 /* be twice this value */
52 #define DIGI_CLOSE_TIMEOUT (5*HZ)
53
54
55 /* AccelePort USB Defines */
56
57 /* ids */
58 #define DIGI_VENDOR_ID 0x05c5
59 #define DIGI_2_ID 0x0002 /* USB-2 */
60 #define DIGI_4_ID 0x0004 /* USB-4 */
61
62 /* commands
63 * "INB": can be used on the in-band endpoint
64 * "OOB": can be used on the out-of-band endpoint
65 */
66 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
67 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
68 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
69 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
70 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
71 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
72 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
73 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
74 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
75 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
76 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
77 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
78 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
79 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
80 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
81 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
82 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
83 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
84 #define DIGI_CMD_SEND_DATA 18 /* INB */
85 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
86 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
87 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
88
89 /* baud rates */
90 #define DIGI_BAUD_50 0
91 #define DIGI_BAUD_75 1
92 #define DIGI_BAUD_110 2
93 #define DIGI_BAUD_150 3
94 #define DIGI_BAUD_200 4
95 #define DIGI_BAUD_300 5
96 #define DIGI_BAUD_600 6
97 #define DIGI_BAUD_1200 7
98 #define DIGI_BAUD_1800 8
99 #define DIGI_BAUD_2400 9
100 #define DIGI_BAUD_4800 10
101 #define DIGI_BAUD_7200 11
102 #define DIGI_BAUD_9600 12
103 #define DIGI_BAUD_14400 13
104 #define DIGI_BAUD_19200 14
105 #define DIGI_BAUD_28800 15
106 #define DIGI_BAUD_38400 16
107 #define DIGI_BAUD_57600 17
108 #define DIGI_BAUD_76800 18
109 #define DIGI_BAUD_115200 19
110 #define DIGI_BAUD_153600 20
111 #define DIGI_BAUD_230400 21
112 #define DIGI_BAUD_460800 22
113
114 /* arguments */
115 #define DIGI_WORD_SIZE_5 0
116 #define DIGI_WORD_SIZE_6 1
117 #define DIGI_WORD_SIZE_7 2
118 #define DIGI_WORD_SIZE_8 3
119
120 #define DIGI_PARITY_NONE 0
121 #define DIGI_PARITY_ODD 1
122 #define DIGI_PARITY_EVEN 2
123 #define DIGI_PARITY_MARK 3
124 #define DIGI_PARITY_SPACE 4
125
126 #define DIGI_STOP_BITS_1 0
127 #define DIGI_STOP_BITS_2 1
128
129 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
130 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
131 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
132
133 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
134 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
135 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
136
137 #define DIGI_DTR_INACTIVE 0
138 #define DIGI_DTR_ACTIVE 1
139 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
140
141 #define DIGI_RTS_INACTIVE 0
142 #define DIGI_RTS_ACTIVE 1
143 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
144 #define DIGI_RTS_TOGGLE 3
145
146 #define DIGI_FLUSH_TX 1
147 #define DIGI_FLUSH_RX 2
148 #define DIGI_RESUME_TX 4 /* clears xoff condition */
149
150 #define DIGI_TRANSMIT_NOT_IDLE 0
151 #define DIGI_TRANSMIT_IDLE 1
152
153 #define DIGI_DISABLE 0
154 #define DIGI_ENABLE 1
155
156 #define DIGI_DEASSERT 0
157 #define DIGI_ASSERT 1
158
159 /* in band status codes */
160 #define DIGI_OVERRUN_ERROR 4
161 #define DIGI_PARITY_ERROR 8
162 #define DIGI_FRAMING_ERROR 16
163 #define DIGI_BREAK_ERROR 32
164
165 /* out of band status */
166 #define DIGI_NO_ERROR 0
167 #define DIGI_BAD_FIRST_PARAMETER 1
168 #define DIGI_BAD_SECOND_PARAMETER 2
169 #define DIGI_INVALID_LINE 3
170 #define DIGI_INVALID_OPCODE 4
171
172 /* input signals */
173 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
174 #define DIGI_READ_INPUT_SIGNALS_ERR 2
175 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
176 #define DIGI_READ_INPUT_SIGNALS_PE 8
177 #define DIGI_READ_INPUT_SIGNALS_CTS 16
178 #define DIGI_READ_INPUT_SIGNALS_DSR 32
179 #define DIGI_READ_INPUT_SIGNALS_RI 64
180 #define DIGI_READ_INPUT_SIGNALS_DCD 128
181
182
183 /* Structures */
184
185 struct digi_serial {
186 spinlock_t ds_serial_lock;
187 struct usb_serial_port *ds_oob_port; /* out-of-band port */
188 int ds_oob_port_num; /* index of out-of-band port */
189 int ds_device_started;
190 };
191
192 struct digi_port {
193 spinlock_t dp_port_lock;
194 int dp_port_num;
195 int dp_out_buf_len;
196 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
197 int dp_write_urb_in_use;
198 unsigned int dp_modem_signals;
199 int dp_transmit_idle;
200 wait_queue_head_t dp_transmit_idle_wait;
201 int dp_throttled;
202 int dp_throttle_restart;
203 wait_queue_head_t dp_flush_wait;
204 wait_queue_head_t dp_close_wait; /* wait queue for close */
205 struct work_struct dp_wakeup_work;
206 struct usb_serial_port *dp_port;
207 };
208
209
210 /* Local Function Declarations */
211
212 static void digi_wakeup_write_lock(struct work_struct *work);
213 static int digi_write_oob_command(struct usb_serial_port *port,
214 unsigned char *buf, int count, int interruptible);
215 static int digi_write_inb_command(struct usb_serial_port *port,
216 unsigned char *buf, int count, unsigned long timeout);
217 static int digi_set_modem_signals(struct usb_serial_port *port,
218 unsigned int modem_signals, int interruptible);
219 static int digi_transmit_idle(struct usb_serial_port *port,
220 unsigned long timeout);
221 static void digi_rx_throttle(struct tty_struct *tty);
222 static void digi_rx_unthrottle(struct tty_struct *tty);
223 static void digi_set_termios(struct tty_struct *tty,
224 struct usb_serial_port *port, struct ktermios *old_termios);
225 static void digi_break_ctl(struct tty_struct *tty, int break_state);
226 static int digi_tiocmget(struct tty_struct *tty);
227 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
228 unsigned int clear);
229 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
230 const unsigned char *buf, int count);
231 static void digi_write_bulk_callback(struct urb *urb);
232 static int digi_write_room(struct tty_struct *tty);
233 static int digi_chars_in_buffer(struct tty_struct *tty);
234 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
235 static void digi_close(struct usb_serial_port *port);
236 static void digi_dtr_rts(struct usb_serial_port *port, int on);
237 static int digi_startup_device(struct usb_serial *serial);
238 static int digi_startup(struct usb_serial *serial);
239 static void digi_disconnect(struct usb_serial *serial);
240 static void digi_release(struct usb_serial *serial);
241 static int digi_port_probe(struct usb_serial_port *port);
242 static int digi_port_remove(struct usb_serial_port *port);
243 static void digi_read_bulk_callback(struct urb *urb);
244 static int digi_read_inb_callback(struct urb *urb);
245 static int digi_read_oob_callback(struct urb *urb);
246
247
248 static const struct usb_device_id id_table_combined[] = {
249 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
250 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
251 { } /* Terminating entry */
252 };
253
254 static const struct usb_device_id id_table_2[] = {
255 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
256 { } /* Terminating entry */
257 };
258
259 static const struct usb_device_id id_table_4[] = {
260 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
261 { } /* Terminating entry */
262 };
263
264 MODULE_DEVICE_TABLE(usb, id_table_combined);
265
266 /* device info needed for the Digi serial converter */
267
268 static struct usb_serial_driver digi_acceleport_2_device = {
269 .driver = {
270 .owner = THIS_MODULE,
271 .name = "digi_2",
272 },
273 .description = "Digi 2 port USB adapter",
274 .id_table = id_table_2,
275 .num_ports = 3,
276 .num_bulk_in = 4,
277 .num_bulk_out = 4,
278 .open = digi_open,
279 .close = digi_close,
280 .dtr_rts = digi_dtr_rts,
281 .write = digi_write,
282 .write_room = digi_write_room,
283 .write_bulk_callback = digi_write_bulk_callback,
284 .read_bulk_callback = digi_read_bulk_callback,
285 .chars_in_buffer = digi_chars_in_buffer,
286 .throttle = digi_rx_throttle,
287 .unthrottle = digi_rx_unthrottle,
288 .set_termios = digi_set_termios,
289 .break_ctl = digi_break_ctl,
290 .tiocmget = digi_tiocmget,
291 .tiocmset = digi_tiocmset,
292 .attach = digi_startup,
293 .disconnect = digi_disconnect,
294 .release = digi_release,
295 .port_probe = digi_port_probe,
296 .port_remove = digi_port_remove,
297 };
298
299 static struct usb_serial_driver digi_acceleport_4_device = {
300 .driver = {
301 .owner = THIS_MODULE,
302 .name = "digi_4",
303 },
304 .description = "Digi 4 port USB adapter",
305 .id_table = id_table_4,
306 .num_ports = 4,
307 .num_bulk_in = 5,
308 .num_bulk_out = 5,
309 .open = digi_open,
310 .close = digi_close,
311 .write = digi_write,
312 .write_room = digi_write_room,
313 .write_bulk_callback = digi_write_bulk_callback,
314 .read_bulk_callback = digi_read_bulk_callback,
315 .chars_in_buffer = digi_chars_in_buffer,
316 .throttle = digi_rx_throttle,
317 .unthrottle = digi_rx_unthrottle,
318 .set_termios = digi_set_termios,
319 .break_ctl = digi_break_ctl,
320 .tiocmget = digi_tiocmget,
321 .tiocmset = digi_tiocmset,
322 .attach = digi_startup,
323 .disconnect = digi_disconnect,
324 .release = digi_release,
325 .port_probe = digi_port_probe,
326 .port_remove = digi_port_remove,
327 };
328
329 static struct usb_serial_driver * const serial_drivers[] = {
330 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
331 };
332
333 /* Functions */
334
335 /*
336 * Cond Wait Interruptible Timeout Irqrestore
337 *
338 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
339 * so that wake ups are not lost if they occur between the unlock
340 * and the sleep. In other words, spin_unlock_irqrestore and
341 * interruptible_sleep_on_timeout are "atomic" with respect to
342 * wake ups. This is used to implement condition variables.
343 *
344 * interruptible_sleep_on_timeout is deprecated and has been replaced
345 * with the equivalent code.
346 */
347
348 static long cond_wait_interruptible_timeout_irqrestore(
349 wait_queue_head_t *q, long timeout,
350 spinlock_t *lock, unsigned long flags)
351 __releases(lock)
352 {
353 DEFINE_WAIT(wait);
354
355 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
356 spin_unlock_irqrestore(lock, flags);
357 timeout = schedule_timeout(timeout);
358 finish_wait(q, &wait);
359
360 return timeout;
361 }
362
363
364 /*
365 * Digi Wakeup Write
366 *
367 * Wake up port, line discipline, and tty processes sleeping
368 * on writes.
369 */
370
371 static void digi_wakeup_write_lock(struct work_struct *work)
372 {
373 struct digi_port *priv =
374 container_of(work, struct digi_port, dp_wakeup_work);
375 struct usb_serial_port *port = priv->dp_port;
376 unsigned long flags;
377
378 spin_lock_irqsave(&priv->dp_port_lock, flags);
379 tty_port_tty_wakeup(&port->port);
380 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
381 }
382
383 /*
384 * Digi Write OOB Command
385 *
386 * Write commands on the out of band port. Commands are 4
387 * bytes each, multiple commands can be sent at once, and
388 * no command will be split across USB packets. Returns 0
389 * if successful, -EINTR if interrupted while sleeping and
390 * the interruptible flag is true, or a negative error
391 * returned by usb_submit_urb.
392 */
393
394 static int digi_write_oob_command(struct usb_serial_port *port,
395 unsigned char *buf, int count, int interruptible)
396 {
397 int ret = 0;
398 int len;
399 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
400 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
401 unsigned long flags = 0;
402
403 dev_dbg(&port->dev,
404 "digi_write_oob_command: TOP: port=%d, count=%d\n",
405 oob_priv->dp_port_num, count);
406
407 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
408 while (count > 0) {
409 while (oob_priv->dp_write_urb_in_use) {
410 cond_wait_interruptible_timeout_irqrestore(
411 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
412 &oob_priv->dp_port_lock, flags);
413 if (interruptible && signal_pending(current))
414 return -EINTR;
415 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
416 }
417
418 /* len must be a multiple of 4, so commands are not split */
419 len = min(count, oob_port->bulk_out_size);
420 if (len > 4)
421 len &= ~3;
422 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
423 oob_port->write_urb->transfer_buffer_length = len;
424 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
425 if (ret == 0) {
426 oob_priv->dp_write_urb_in_use = 1;
427 count -= len;
428 buf += len;
429 }
430 }
431 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
432 if (ret)
433 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
434 __func__, ret);
435 return ret;
436
437 }
438
439
440 /*
441 * Digi Write In Band Command
442 *
443 * Write commands on the given port. Commands are 4
444 * bytes each, multiple commands can be sent at once, and
445 * no command will be split across USB packets. If timeout
446 * is non-zero, write in band command will return after
447 * waiting unsuccessfully for the URB status to clear for
448 * timeout ticks. Returns 0 if successful, or a negative
449 * error returned by digi_write.
450 */
451
452 static int digi_write_inb_command(struct usb_serial_port *port,
453 unsigned char *buf, int count, unsigned long timeout)
454 {
455 int ret = 0;
456 int len;
457 struct digi_port *priv = usb_get_serial_port_data(port);
458 unsigned char *data = port->write_urb->transfer_buffer;
459 unsigned long flags = 0;
460
461 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
462 priv->dp_port_num, count);
463
464 if (timeout)
465 timeout += jiffies;
466 else
467 timeout = ULONG_MAX;
468
469 spin_lock_irqsave(&priv->dp_port_lock, flags);
470 while (count > 0 && ret == 0) {
471 while (priv->dp_write_urb_in_use &&
472 time_before(jiffies, timeout)) {
473 cond_wait_interruptible_timeout_irqrestore(
474 &port->write_wait, DIGI_RETRY_TIMEOUT,
475 &priv->dp_port_lock, flags);
476 if (signal_pending(current))
477 return -EINTR;
478 spin_lock_irqsave(&priv->dp_port_lock, flags);
479 }
480
481 /* len must be a multiple of 4 and small enough to */
482 /* guarantee the write will send buffered data first, */
483 /* so commands are in order with data and not split */
484 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
485 if (len > 4)
486 len &= ~3;
487
488 /* write any buffered data first */
489 if (priv->dp_out_buf_len > 0) {
490 data[0] = DIGI_CMD_SEND_DATA;
491 data[1] = priv->dp_out_buf_len;
492 memcpy(data + 2, priv->dp_out_buf,
493 priv->dp_out_buf_len);
494 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
495 port->write_urb->transfer_buffer_length
496 = priv->dp_out_buf_len + 2 + len;
497 } else {
498 memcpy(data, buf, len);
499 port->write_urb->transfer_buffer_length = len;
500 }
501
502 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
503 if (ret == 0) {
504 priv->dp_write_urb_in_use = 1;
505 priv->dp_out_buf_len = 0;
506 count -= len;
507 buf += len;
508 }
509
510 }
511 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
512
513 if (ret)
514 dev_err(&port->dev,
515 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
516 __func__, ret, priv->dp_port_num);
517 return ret;
518 }
519
520
521 /*
522 * Digi Set Modem Signals
523 *
524 * Sets or clears DTR and RTS on the port, according to the
525 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
526 * for the modem_signals argument. Returns 0 if successful,
527 * -EINTR if interrupted while sleeping, or a non-zero error
528 * returned by usb_submit_urb.
529 */
530
531 static int digi_set_modem_signals(struct usb_serial_port *port,
532 unsigned int modem_signals, int interruptible)
533 {
534
535 int ret;
536 struct digi_port *port_priv = usb_get_serial_port_data(port);
537 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
538 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
539 unsigned char *data = oob_port->write_urb->transfer_buffer;
540 unsigned long flags = 0;
541
542
543 dev_dbg(&port->dev,
544 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
545 port_priv->dp_port_num, modem_signals);
546
547 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
548 spin_lock(&port_priv->dp_port_lock);
549
550 while (oob_priv->dp_write_urb_in_use) {
551 spin_unlock(&port_priv->dp_port_lock);
552 cond_wait_interruptible_timeout_irqrestore(
553 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
554 &oob_priv->dp_port_lock, flags);
555 if (interruptible && signal_pending(current))
556 return -EINTR;
557 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
558 spin_lock(&port_priv->dp_port_lock);
559 }
560 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
561 data[1] = port_priv->dp_port_num;
562 data[2] = (modem_signals & TIOCM_DTR) ?
563 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
564 data[3] = 0;
565 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
566 data[5] = port_priv->dp_port_num;
567 data[6] = (modem_signals & TIOCM_RTS) ?
568 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
569 data[7] = 0;
570
571 oob_port->write_urb->transfer_buffer_length = 8;
572
573 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
574 if (ret == 0) {
575 oob_priv->dp_write_urb_in_use = 1;
576 port_priv->dp_modem_signals =
577 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
578 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
579 }
580 spin_unlock(&port_priv->dp_port_lock);
581 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
582 if (ret)
583 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
584 __func__, ret);
585 return ret;
586 }
587
588 /*
589 * Digi Transmit Idle
590 *
591 * Digi transmit idle waits, up to timeout ticks, for the transmitter
592 * to go idle. It returns 0 if successful or a negative error.
593 *
594 * There are race conditions here if more than one process is calling
595 * digi_transmit_idle on the same port at the same time. However, this
596 * is only called from close, and only one process can be in close on a
597 * port at a time, so its ok.
598 */
599
600 static int digi_transmit_idle(struct usb_serial_port *port,
601 unsigned long timeout)
602 {
603 int ret;
604 unsigned char buf[2];
605 struct digi_port *priv = usb_get_serial_port_data(port);
606 unsigned long flags = 0;
607
608 spin_lock_irqsave(&priv->dp_port_lock, flags);
609 priv->dp_transmit_idle = 0;
610 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
611
612 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
613 buf[1] = 0;
614
615 timeout += jiffies;
616
617 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
618 if (ret != 0)
619 return ret;
620
621 spin_lock_irqsave(&priv->dp_port_lock, flags);
622
623 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
624 cond_wait_interruptible_timeout_irqrestore(
625 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
626 &priv->dp_port_lock, flags);
627 if (signal_pending(current))
628 return -EINTR;
629 spin_lock_irqsave(&priv->dp_port_lock, flags);
630 }
631 priv->dp_transmit_idle = 0;
632 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
633 return 0;
634
635 }
636
637
638 static void digi_rx_throttle(struct tty_struct *tty)
639 {
640 unsigned long flags;
641 struct usb_serial_port *port = tty->driver_data;
642 struct digi_port *priv = usb_get_serial_port_data(port);
643
644 /* stop receiving characters by not resubmitting the read urb */
645 spin_lock_irqsave(&priv->dp_port_lock, flags);
646 priv->dp_throttled = 1;
647 priv->dp_throttle_restart = 0;
648 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
649 }
650
651
652 static void digi_rx_unthrottle(struct tty_struct *tty)
653 {
654 int ret = 0;
655 unsigned long flags;
656 struct usb_serial_port *port = tty->driver_data;
657 struct digi_port *priv = usb_get_serial_port_data(port);
658
659 spin_lock_irqsave(&priv->dp_port_lock, flags);
660
661 /* restart read chain */
662 if (priv->dp_throttle_restart)
663 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
664
665 /* turn throttle off */
666 priv->dp_throttled = 0;
667 priv->dp_throttle_restart = 0;
668
669 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
670
671 if (ret)
672 dev_err(&port->dev,
673 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
674 __func__, ret, priv->dp_port_num);
675 }
676
677
678 static void digi_set_termios(struct tty_struct *tty,
679 struct usb_serial_port *port, struct ktermios *old_termios)
680 {
681 struct digi_port *priv = usb_get_serial_port_data(port);
682 struct device *dev = &port->dev;
683 unsigned int iflag = tty->termios.c_iflag;
684 unsigned int cflag = tty->termios.c_cflag;
685 unsigned int old_iflag = old_termios->c_iflag;
686 unsigned int old_cflag = old_termios->c_cflag;
687 unsigned char buf[32];
688 unsigned int modem_signals;
689 int arg, ret;
690 int i = 0;
691 speed_t baud;
692
693 dev_dbg(dev,
694 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
695 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
696
697 /* set baud rate */
698 baud = tty_get_baud_rate(tty);
699 if (baud != tty_termios_baud_rate(old_termios)) {
700 arg = -1;
701
702 /* reassert DTR and (maybe) RTS on transition from B0 */
703 if ((old_cflag & CBAUD) == B0) {
704 /* don't set RTS if using hardware flow control */
705 /* and throttling input */
706 modem_signals = TIOCM_DTR;
707 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
708 modem_signals |= TIOCM_RTS;
709 digi_set_modem_signals(port, modem_signals, 1);
710 }
711 switch (baud) {
712 /* drop DTR and RTS on transition to B0 */
713 case 0: digi_set_modem_signals(port, 0, 1); break;
714 case 50: arg = DIGI_BAUD_50; break;
715 case 75: arg = DIGI_BAUD_75; break;
716 case 110: arg = DIGI_BAUD_110; break;
717 case 150: arg = DIGI_BAUD_150; break;
718 case 200: arg = DIGI_BAUD_200; break;
719 case 300: arg = DIGI_BAUD_300; break;
720 case 600: arg = DIGI_BAUD_600; break;
721 case 1200: arg = DIGI_BAUD_1200; break;
722 case 1800: arg = DIGI_BAUD_1800; break;
723 case 2400: arg = DIGI_BAUD_2400; break;
724 case 4800: arg = DIGI_BAUD_4800; break;
725 case 9600: arg = DIGI_BAUD_9600; break;
726 case 19200: arg = DIGI_BAUD_19200; break;
727 case 38400: arg = DIGI_BAUD_38400; break;
728 case 57600: arg = DIGI_BAUD_57600; break;
729 case 115200: arg = DIGI_BAUD_115200; break;
730 case 230400: arg = DIGI_BAUD_230400; break;
731 case 460800: arg = DIGI_BAUD_460800; break;
732 default:
733 arg = DIGI_BAUD_9600;
734 baud = 9600;
735 break;
736 }
737 if (arg != -1) {
738 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
739 buf[i++] = priv->dp_port_num;
740 buf[i++] = arg;
741 buf[i++] = 0;
742 }
743 }
744 /* set parity */
745 tty->termios.c_cflag &= ~CMSPAR;
746
747 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
748 if (cflag&PARENB) {
749 if (cflag&PARODD)
750 arg = DIGI_PARITY_ODD;
751 else
752 arg = DIGI_PARITY_EVEN;
753 } else {
754 arg = DIGI_PARITY_NONE;
755 }
756 buf[i++] = DIGI_CMD_SET_PARITY;
757 buf[i++] = priv->dp_port_num;
758 buf[i++] = arg;
759 buf[i++] = 0;
760 }
761 /* set word size */
762 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
763 arg = -1;
764 switch (cflag&CSIZE) {
765 case CS5: arg = DIGI_WORD_SIZE_5; break;
766 case CS6: arg = DIGI_WORD_SIZE_6; break;
767 case CS7: arg = DIGI_WORD_SIZE_7; break;
768 case CS8: arg = DIGI_WORD_SIZE_8; break;
769 default:
770 dev_dbg(dev,
771 "digi_set_termios: can't handle word size %d\n",
772 (cflag&CSIZE));
773 break;
774 }
775
776 if (arg != -1) {
777 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
778 buf[i++] = priv->dp_port_num;
779 buf[i++] = arg;
780 buf[i++] = 0;
781 }
782
783 }
784
785 /* set stop bits */
786 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
787
788 if ((cflag&CSTOPB))
789 arg = DIGI_STOP_BITS_2;
790 else
791 arg = DIGI_STOP_BITS_1;
792
793 buf[i++] = DIGI_CMD_SET_STOP_BITS;
794 buf[i++] = priv->dp_port_num;
795 buf[i++] = arg;
796 buf[i++] = 0;
797
798 }
799
800 /* set input flow control */
801 if ((iflag&IXOFF) != (old_iflag&IXOFF)
802 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
803 arg = 0;
804 if (iflag&IXOFF)
805 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
806 else
807 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
808
809 if (cflag&CRTSCTS) {
810 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
811
812 /* On USB-4 it is necessary to assert RTS prior */
813 /* to selecting RTS input flow control. */
814 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
815 buf[i++] = priv->dp_port_num;
816 buf[i++] = DIGI_RTS_ACTIVE;
817 buf[i++] = 0;
818
819 } else {
820 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
821 }
822 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
823 buf[i++] = priv->dp_port_num;
824 buf[i++] = arg;
825 buf[i++] = 0;
826 }
827
828 /* set output flow control */
829 if ((iflag & IXON) != (old_iflag & IXON)
830 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
831 arg = 0;
832 if (iflag & IXON)
833 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
834 else
835 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
836
837 if (cflag & CRTSCTS) {
838 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
839 } else {
840 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
841 }
842
843 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
844 buf[i++] = priv->dp_port_num;
845 buf[i++] = arg;
846 buf[i++] = 0;
847 }
848
849 /* set receive enable/disable */
850 if ((cflag & CREAD) != (old_cflag & CREAD)) {
851 if (cflag & CREAD)
852 arg = DIGI_ENABLE;
853 else
854 arg = DIGI_DISABLE;
855
856 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
857 buf[i++] = priv->dp_port_num;
858 buf[i++] = arg;
859 buf[i++] = 0;
860 }
861 ret = digi_write_oob_command(port, buf, i, 1);
862 if (ret != 0)
863 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
864 tty_encode_baud_rate(tty, baud, baud);
865 }
866
867
868 static void digi_break_ctl(struct tty_struct *tty, int break_state)
869 {
870 struct usb_serial_port *port = tty->driver_data;
871 unsigned char buf[4];
872
873 buf[0] = DIGI_CMD_BREAK_CONTROL;
874 buf[1] = 2; /* length */
875 buf[2] = break_state ? 1 : 0;
876 buf[3] = 0; /* pad */
877 digi_write_inb_command(port, buf, 4, 0);
878 }
879
880
881 static int digi_tiocmget(struct tty_struct *tty)
882 {
883 struct usb_serial_port *port = tty->driver_data;
884 struct digi_port *priv = usb_get_serial_port_data(port);
885 unsigned int val;
886 unsigned long flags;
887
888 spin_lock_irqsave(&priv->dp_port_lock, flags);
889 val = priv->dp_modem_signals;
890 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
891 return val;
892 }
893
894
895 static int digi_tiocmset(struct tty_struct *tty,
896 unsigned int set, unsigned int clear)
897 {
898 struct usb_serial_port *port = tty->driver_data;
899 struct digi_port *priv = usb_get_serial_port_data(port);
900 unsigned int val;
901 unsigned long flags;
902
903 spin_lock_irqsave(&priv->dp_port_lock, flags);
904 val = (priv->dp_modem_signals & ~clear) | set;
905 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
906 return digi_set_modem_signals(port, val, 1);
907 }
908
909
910 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
911 const unsigned char *buf, int count)
912 {
913
914 int ret, data_len, new_len;
915 struct digi_port *priv = usb_get_serial_port_data(port);
916 unsigned char *data = port->write_urb->transfer_buffer;
917 unsigned long flags = 0;
918
919 dev_dbg(&port->dev,
920 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
921 priv->dp_port_num, count, in_interrupt());
922
923 /* copy user data (which can sleep) before getting spin lock */
924 count = min(count, port->bulk_out_size-2);
925 count = min(64, count);
926
927 /* be sure only one write proceeds at a time */
928 /* there are races on the port private buffer */
929 spin_lock_irqsave(&priv->dp_port_lock, flags);
930
931 /* wait for urb status clear to submit another urb */
932 if (priv->dp_write_urb_in_use) {
933 /* buffer data if count is 1 (probably put_char) if possible */
934 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
935 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
936 new_len = 1;
937 } else {
938 new_len = 0;
939 }
940 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
941 return new_len;
942 }
943
944 /* allow space for any buffered data and for new data, up to */
945 /* transfer buffer size - 2 (for command and length bytes) */
946 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
947 data_len = new_len + priv->dp_out_buf_len;
948
949 if (data_len == 0) {
950 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
951 return 0;
952 }
953
954 port->write_urb->transfer_buffer_length = data_len+2;
955
956 *data++ = DIGI_CMD_SEND_DATA;
957 *data++ = data_len;
958
959 /* copy in buffered data first */
960 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
961 data += priv->dp_out_buf_len;
962
963 /* copy in new data */
964 memcpy(data, buf, new_len);
965
966 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
967 if (ret == 0) {
968 priv->dp_write_urb_in_use = 1;
969 ret = new_len;
970 priv->dp_out_buf_len = 0;
971 }
972
973 /* return length of new data written, or error */
974 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
975 if (ret < 0)
976 dev_err_console(port,
977 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
978 __func__, ret, priv->dp_port_num);
979 dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
980 return ret;
981
982 }
983
984 static void digi_write_bulk_callback(struct urb *urb)
985 {
986
987 struct usb_serial_port *port = urb->context;
988 struct usb_serial *serial;
989 struct digi_port *priv;
990 struct digi_serial *serial_priv;
991 int ret = 0;
992 int status = urb->status;
993
994 /* port and serial sanity check */
995 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
996 pr_err("%s: port or port->private is NULL, status=%d\n",
997 __func__, status);
998 return;
999 }
1000 serial = port->serial;
1001 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
1002 dev_err(&port->dev,
1003 "%s: serial or serial->private is NULL, status=%d\n",
1004 __func__, status);
1005 return;
1006 }
1007
1008 /* handle oob callback */
1009 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1010 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
1011 spin_lock(&priv->dp_port_lock);
1012 priv->dp_write_urb_in_use = 0;
1013 wake_up_interruptible(&port->write_wait);
1014 spin_unlock(&priv->dp_port_lock);
1015 return;
1016 }
1017
1018 /* try to send any buffered data on this port */
1019 spin_lock(&priv->dp_port_lock);
1020 priv->dp_write_urb_in_use = 0;
1021 if (priv->dp_out_buf_len > 0) {
1022 *((unsigned char *)(port->write_urb->transfer_buffer))
1023 = (unsigned char)DIGI_CMD_SEND_DATA;
1024 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1025 = (unsigned char)priv->dp_out_buf_len;
1026 port->write_urb->transfer_buffer_length =
1027 priv->dp_out_buf_len + 2;
1028 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1029 priv->dp_out_buf_len);
1030 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1031 if (ret == 0) {
1032 priv->dp_write_urb_in_use = 1;
1033 priv->dp_out_buf_len = 0;
1034 }
1035 }
1036 /* wake up processes sleeping on writes immediately */
1037 tty_port_tty_wakeup(&port->port);
1038 /* also queue up a wakeup at scheduler time, in case we */
1039 /* lost the race in write_chan(). */
1040 schedule_work(&priv->dp_wakeup_work);
1041
1042 spin_unlock(&priv->dp_port_lock);
1043 if (ret && ret != -EPERM)
1044 dev_err_console(port,
1045 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1046 __func__, ret, priv->dp_port_num);
1047 }
1048
1049 static int digi_write_room(struct tty_struct *tty)
1050 {
1051 struct usb_serial_port *port = tty->driver_data;
1052 struct digi_port *priv = usb_get_serial_port_data(port);
1053 int room;
1054 unsigned long flags = 0;
1055
1056 spin_lock_irqsave(&priv->dp_port_lock, flags);
1057
1058 if (priv->dp_write_urb_in_use)
1059 room = 0;
1060 else
1061 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1062
1063 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1064 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
1065 return room;
1066
1067 }
1068
1069 static int digi_chars_in_buffer(struct tty_struct *tty)
1070 {
1071 struct usb_serial_port *port = tty->driver_data;
1072 struct digi_port *priv = usb_get_serial_port_data(port);
1073
1074 if (priv->dp_write_urb_in_use) {
1075 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1076 priv->dp_port_num, port->bulk_out_size - 2);
1077 /* return(port->bulk_out_size - 2); */
1078 return 256;
1079 } else {
1080 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1081 priv->dp_port_num, priv->dp_out_buf_len);
1082 return priv->dp_out_buf_len;
1083 }
1084
1085 }
1086
1087 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1088 {
1089 /* Adjust DTR and RTS */
1090 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1091 }
1092
1093 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1094 {
1095 int ret;
1096 unsigned char buf[32];
1097 struct digi_port *priv = usb_get_serial_port_data(port);
1098 struct ktermios not_termios;
1099
1100 /* be sure the device is started up */
1101 if (digi_startup_device(port->serial) != 0)
1102 return -ENXIO;
1103
1104 /* read modem signals automatically whenever they change */
1105 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1106 buf[1] = priv->dp_port_num;
1107 buf[2] = DIGI_ENABLE;
1108 buf[3] = 0;
1109
1110 /* flush fifos */
1111 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1112 buf[5] = priv->dp_port_num;
1113 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1114 buf[7] = 0;
1115
1116 ret = digi_write_oob_command(port, buf, 8, 1);
1117 if (ret != 0)
1118 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1119
1120 /* set termios settings */
1121 if (tty) {
1122 not_termios.c_cflag = ~tty->termios.c_cflag;
1123 not_termios.c_iflag = ~tty->termios.c_iflag;
1124 digi_set_termios(tty, port, &not_termios);
1125 }
1126 return 0;
1127 }
1128
1129
1130 static void digi_close(struct usb_serial_port *port)
1131 {
1132 DEFINE_WAIT(wait);
1133 int ret;
1134 unsigned char buf[32];
1135 struct digi_port *priv = usb_get_serial_port_data(port);
1136
1137 mutex_lock(&port->serial->disc_mutex);
1138 /* if disconnected, just clear flags */
1139 if (port->serial->disconnected)
1140 goto exit;
1141
1142 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1143 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1144
1145 /* disable input flow control */
1146 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1147 buf[1] = priv->dp_port_num;
1148 buf[2] = DIGI_DISABLE;
1149 buf[3] = 0;
1150
1151 /* disable output flow control */
1152 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1153 buf[5] = priv->dp_port_num;
1154 buf[6] = DIGI_DISABLE;
1155 buf[7] = 0;
1156
1157 /* disable reading modem signals automatically */
1158 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1159 buf[9] = priv->dp_port_num;
1160 buf[10] = DIGI_DISABLE;
1161 buf[11] = 0;
1162
1163 /* disable receive */
1164 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1165 buf[13] = priv->dp_port_num;
1166 buf[14] = DIGI_DISABLE;
1167 buf[15] = 0;
1168
1169 /* flush fifos */
1170 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1171 buf[17] = priv->dp_port_num;
1172 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1173 buf[19] = 0;
1174
1175 ret = digi_write_oob_command(port, buf, 20, 0);
1176 if (ret != 0)
1177 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",
1178 ret);
1179 /* wait for final commands on oob port to complete */
1180 prepare_to_wait(&priv->dp_flush_wait, &wait,
1181 TASK_INTERRUPTIBLE);
1182 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1183 finish_wait(&priv->dp_flush_wait, &wait);
1184
1185 /* shutdown any outstanding bulk writes */
1186 usb_kill_urb(port->write_urb);
1187 exit:
1188 spin_lock_irq(&priv->dp_port_lock);
1189 priv->dp_write_urb_in_use = 0;
1190 wake_up_interruptible(&priv->dp_close_wait);
1191 spin_unlock_irq(&priv->dp_port_lock);
1192 mutex_unlock(&port->serial->disc_mutex);
1193 }
1194
1195
1196 /*
1197 * Digi Startup Device
1198 *
1199 * Starts reads on all ports. Must be called AFTER startup, with
1200 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1201 */
1202
1203 static int digi_startup_device(struct usb_serial *serial)
1204 {
1205 int i, ret = 0;
1206 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1207 struct usb_serial_port *port;
1208
1209 /* be sure this happens exactly once */
1210 spin_lock(&serial_priv->ds_serial_lock);
1211 if (serial_priv->ds_device_started) {
1212 spin_unlock(&serial_priv->ds_serial_lock);
1213 return 0;
1214 }
1215 serial_priv->ds_device_started = 1;
1216 spin_unlock(&serial_priv->ds_serial_lock);
1217
1218 /* start reading from each bulk in endpoint for the device */
1219 /* set USB_DISABLE_SPD flag for write bulk urbs */
1220 for (i = 0; i < serial->type->num_ports + 1; i++) {
1221 port = serial->port[i];
1222 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1223 if (ret != 0) {
1224 dev_err(&port->dev,
1225 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1226 __func__, ret, i);
1227 break;
1228 }
1229 }
1230 return ret;
1231 }
1232
1233 static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1234 {
1235 struct digi_port *priv;
1236
1237 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1238 if (!priv)
1239 return -ENOMEM;
1240
1241 spin_lock_init(&priv->dp_port_lock);
1242 priv->dp_port_num = port_num;
1243 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1244 init_waitqueue_head(&priv->dp_flush_wait);
1245 init_waitqueue_head(&priv->dp_close_wait);
1246 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1247 priv->dp_port = port;
1248
1249 init_waitqueue_head(&port->write_wait);
1250
1251 usb_set_serial_port_data(port, priv);
1252
1253 return 0;
1254 }
1255
1256 static int digi_startup(struct usb_serial *serial)
1257 {
1258 struct digi_serial *serial_priv;
1259 int ret;
1260
1261 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1262 if (!serial_priv)
1263 return -ENOMEM;
1264
1265 spin_lock_init(&serial_priv->ds_serial_lock);
1266 serial_priv->ds_oob_port_num = serial->type->num_ports;
1267 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1268
1269 ret = digi_port_init(serial_priv->ds_oob_port,
1270 serial_priv->ds_oob_port_num);
1271 if (ret) {
1272 kfree(serial_priv);
1273 return ret;
1274 }
1275
1276 usb_set_serial_data(serial, serial_priv);
1277
1278 return 0;
1279 }
1280
1281
1282 static void digi_disconnect(struct usb_serial *serial)
1283 {
1284 int i;
1285
1286 /* stop reads and writes on all ports */
1287 for (i = 0; i < serial->type->num_ports + 1; i++) {
1288 usb_kill_urb(serial->port[i]->read_urb);
1289 usb_kill_urb(serial->port[i]->write_urb);
1290 }
1291 }
1292
1293
1294 static void digi_release(struct usb_serial *serial)
1295 {
1296 struct digi_serial *serial_priv;
1297 struct digi_port *priv;
1298
1299 serial_priv = usb_get_serial_data(serial);
1300
1301 priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
1302 kfree(priv);
1303
1304 kfree(serial_priv);
1305 }
1306
1307 static int digi_port_probe(struct usb_serial_port *port)
1308 {
1309 return digi_port_init(port, port->port_number);
1310 }
1311
1312 static int digi_port_remove(struct usb_serial_port *port)
1313 {
1314 struct digi_port *priv;
1315
1316 priv = usb_get_serial_port_data(port);
1317 kfree(priv);
1318
1319 return 0;
1320 }
1321
1322 static void digi_read_bulk_callback(struct urb *urb)
1323 {
1324 struct usb_serial_port *port = urb->context;
1325 struct digi_port *priv;
1326 struct digi_serial *serial_priv;
1327 int ret;
1328 int status = urb->status;
1329
1330 /* port sanity check, do not resubmit if port is not valid */
1331 if (port == NULL)
1332 return;
1333 priv = usb_get_serial_port_data(port);
1334 if (priv == NULL) {
1335 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1336 __func__, status);
1337 return;
1338 }
1339 if (port->serial == NULL ||
1340 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1341 dev_err(&port->dev, "%s: serial is bad or serial->private "
1342 "is NULL, status=%d\n", __func__, status);
1343 return;
1344 }
1345
1346 /* do not resubmit urb if it has any status error */
1347 if (status) {
1348 dev_err(&port->dev,
1349 "%s: nonzero read bulk status: status=%d, port=%d\n",
1350 __func__, status, priv->dp_port_num);
1351 return;
1352 }
1353
1354 /* handle oob or inb callback, do not resubmit if error */
1355 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1356 if (digi_read_oob_callback(urb) != 0)
1357 return;
1358 } else {
1359 if (digi_read_inb_callback(urb) != 0)
1360 return;
1361 }
1362
1363 /* continue read */
1364 ret = usb_submit_urb(urb, GFP_ATOMIC);
1365 if (ret != 0 && ret != -EPERM) {
1366 dev_err(&port->dev,
1367 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1368 __func__, ret, priv->dp_port_num);
1369 }
1370
1371 }
1372
1373 /*
1374 * Digi Read INB Callback
1375 *
1376 * Digi Read INB Callback handles reads on the in band ports, sending
1377 * the data on to the tty subsystem. When called we know port and
1378 * port->private are not NULL and port->serial has been validated.
1379 * It returns 0 if successful, 1 if successful but the port is
1380 * throttled, and -1 if the sanity checks failed.
1381 */
1382
1383 static int digi_read_inb_callback(struct urb *urb)
1384 {
1385 struct usb_serial_port *port = urb->context;
1386 struct digi_port *priv = usb_get_serial_port_data(port);
1387 unsigned char *buf = urb->transfer_buffer;
1388 int opcode;
1389 int len;
1390 int port_status;
1391 unsigned char *data;
1392 int flag, throttled;
1393
1394 /* short/multiple packet check */
1395 if (urb->actual_length < 2) {
1396 dev_warn(&port->dev, "short packet received\n");
1397 return -1;
1398 }
1399
1400 opcode = buf[0];
1401 len = buf[1];
1402
1403 if (urb->actual_length != len + 2) {
1404 dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n",
1405 priv->dp_port_num, opcode, len, urb->actual_length);
1406 return -1;
1407 }
1408
1409 if (opcode == DIGI_CMD_RECEIVE_DATA && len < 1) {
1410 dev_err(&port->dev, "malformed data packet received\n");
1411 return -1;
1412 }
1413
1414 spin_lock(&priv->dp_port_lock);
1415
1416 /* check for throttle; if set, do not resubmit read urb */
1417 /* indicate the read chain needs to be restarted on unthrottle */
1418 throttled = priv->dp_throttled;
1419 if (throttled)
1420 priv->dp_throttle_restart = 1;
1421
1422 /* receive data */
1423 if (opcode == DIGI_CMD_RECEIVE_DATA) {
1424 port_status = buf[2];
1425 data = &buf[3];
1426
1427 /* get flag from port_status */
1428 flag = 0;
1429
1430 /* overrun is special, not associated with a char */
1431 if (port_status & DIGI_OVERRUN_ERROR)
1432 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1433
1434 /* break takes precedence over parity, */
1435 /* which takes precedence over framing errors */
1436 if (port_status & DIGI_BREAK_ERROR)
1437 flag = TTY_BREAK;
1438 else if (port_status & DIGI_PARITY_ERROR)
1439 flag = TTY_PARITY;
1440 else if (port_status & DIGI_FRAMING_ERROR)
1441 flag = TTY_FRAME;
1442
1443 /* data length is len-1 (one byte of len is port_status) */
1444 --len;
1445 if (len > 0) {
1446 tty_insert_flip_string_fixed_flag(&port->port, data,
1447 flag, len);
1448 tty_flip_buffer_push(&port->port);
1449 }
1450 }
1451 spin_unlock(&priv->dp_port_lock);
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 unsigned char *buf = urb->transfer_buffer;
1480 int opcode, line, status, val;
1481 int i;
1482 unsigned int rts;
1483
1484 if (urb->actual_length < 4)
1485 return -1;
1486
1487 /* handle each oob command */
1488 for (i = 0; i < urb->actual_length - 3; i += 4) {
1489 opcode = buf[i];
1490 line = buf[i + 1];
1491 status = buf[i + 2];
1492 val = buf[i + 3];
1493
1494 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1495 opcode, line, status, val);
1496
1497 if (status != 0 || line >= serial->type->num_ports)
1498 continue;
1499
1500 port = serial->port[line];
1501
1502 priv = usb_get_serial_port_data(port);
1503 if (priv == NULL)
1504 return -1;
1505
1506 tty = tty_port_tty_get(&port->port);
1507
1508 rts = 0;
1509 if (tty)
1510 rts = C_CRTSCTS(tty);
1511
1512 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1513 spin_lock(&priv->dp_port_lock);
1514 /* convert from digi flags to termiox flags */
1515 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1516 priv->dp_modem_signals |= TIOCM_CTS;
1517 /* port must be open to use tty struct */
1518 if (rts)
1519 tty_port_tty_wakeup(&port->port);
1520 } else {
1521 priv->dp_modem_signals &= ~TIOCM_CTS;
1522 /* port must be open to use tty struct */
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 spin_unlock(&priv->dp_port_lock);
1538 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1539 spin_lock(&priv->dp_port_lock);
1540 priv->dp_transmit_idle = 1;
1541 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1542 spin_unlock(&priv->dp_port_lock);
1543 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1544 wake_up_interruptible(&priv->dp_flush_wait);
1545 }
1546 tty_kref_put(tty);
1547 }
1548 return 0;
1549
1550 }
1551
1552 module_usb_serial_driver(serial_drivers, id_table_combined);
1553
1554 MODULE_AUTHOR(DRIVER_AUTHOR);
1555 MODULE_DESCRIPTION(DRIVER_DESC);
1556 MODULE_LICENSE("GPL");
CRIS linux kernel tree