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