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Merge branch 'next/gpio-samsung' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 /*
36 * Version Information
37 */
38 #define DRIVER_VERSION "v1.80.1.2"
39 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
40 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
41
42 /* port output buffer length -- must be <= transfer buffer length - 2 */
43 /* so we can be sure to send the full buffer in one urb */
44 #define DIGI_OUT_BUF_SIZE 8
45
46 /* port input buffer length -- must be >= transfer buffer length - 3 */
47 /* so we can be sure to hold at least one full buffer from one urb */
48 #define DIGI_IN_BUF_SIZE 64
49
50 /* retry timeout while sleeping */
51 #define DIGI_RETRY_TIMEOUT (HZ/10)
52
53 /* timeout while waiting for tty output to drain in close */
54 /* this delay is used twice in close, so the total delay could */
55 /* be twice this value */
56 #define DIGI_CLOSE_TIMEOUT (5*HZ)
57
58
59 /* AccelePort USB Defines */
60
61 /* ids */
62 #define DIGI_VENDOR_ID 0x05c5
63 #define DIGI_2_ID 0x0002 /* USB-2 */
64 #define DIGI_4_ID 0x0004 /* USB-4 */
65
66 /* commands
67 * "INB": can be used on the in-band endpoint
68 * "OOB": can be used on the out-of-band endpoint
69 */
70 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
71 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
72 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
73 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
74 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
75 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
76 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
77 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
78 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
79 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
80 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
81 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
82 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
83 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
84 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
85 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
86 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
87 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
88 #define DIGI_CMD_SEND_DATA 18 /* INB */
89 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
90 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
91 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
92
93 /* baud rates */
94 #define DIGI_BAUD_50 0
95 #define DIGI_BAUD_75 1
96 #define DIGI_BAUD_110 2
97 #define DIGI_BAUD_150 3
98 #define DIGI_BAUD_200 4
99 #define DIGI_BAUD_300 5
100 #define DIGI_BAUD_600 6
101 #define DIGI_BAUD_1200 7
102 #define DIGI_BAUD_1800 8
103 #define DIGI_BAUD_2400 9
104 #define DIGI_BAUD_4800 10
105 #define DIGI_BAUD_7200 11
106 #define DIGI_BAUD_9600 12
107 #define DIGI_BAUD_14400 13
108 #define DIGI_BAUD_19200 14
109 #define DIGI_BAUD_28800 15
110 #define DIGI_BAUD_38400 16
111 #define DIGI_BAUD_57600 17
112 #define DIGI_BAUD_76800 18
113 #define DIGI_BAUD_115200 19
114 #define DIGI_BAUD_153600 20
115 #define DIGI_BAUD_230400 21
116 #define DIGI_BAUD_460800 22
117
118 /* arguments */
119 #define DIGI_WORD_SIZE_5 0
120 #define DIGI_WORD_SIZE_6 1
121 #define DIGI_WORD_SIZE_7 2
122 #define DIGI_WORD_SIZE_8 3
123
124 #define DIGI_PARITY_NONE 0
125 #define DIGI_PARITY_ODD 1
126 #define DIGI_PARITY_EVEN 2
127 #define DIGI_PARITY_MARK 3
128 #define DIGI_PARITY_SPACE 4
129
130 #define DIGI_STOP_BITS_1 0
131 #define DIGI_STOP_BITS_2 1
132
133 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
134 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
135 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
136
137 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
138 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
139 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
140
141 #define DIGI_DTR_INACTIVE 0
142 #define DIGI_DTR_ACTIVE 1
143 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
144
145 #define DIGI_RTS_INACTIVE 0
146 #define DIGI_RTS_ACTIVE 1
147 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
148 #define DIGI_RTS_TOGGLE 3
149
150 #define DIGI_FLUSH_TX 1
151 #define DIGI_FLUSH_RX 2
152 #define DIGI_RESUME_TX 4 /* clears xoff condition */
153
154 #define DIGI_TRANSMIT_NOT_IDLE 0
155 #define DIGI_TRANSMIT_IDLE 1
156
157 #define DIGI_DISABLE 0
158 #define DIGI_ENABLE 1
159
160 #define DIGI_DEASSERT 0
161 #define DIGI_ASSERT 1
162
163 /* in band status codes */
164 #define DIGI_OVERRUN_ERROR 4
165 #define DIGI_PARITY_ERROR 8
166 #define DIGI_FRAMING_ERROR 16
167 #define DIGI_BREAK_ERROR 32
168
169 /* out of band status */
170 #define DIGI_NO_ERROR 0
171 #define DIGI_BAD_FIRST_PARAMETER 1
172 #define DIGI_BAD_SECOND_PARAMETER 2
173 #define DIGI_INVALID_LINE 3
174 #define DIGI_INVALID_OPCODE 4
175
176 /* input signals */
177 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
178 #define DIGI_READ_INPUT_SIGNALS_ERR 2
179 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
180 #define DIGI_READ_INPUT_SIGNALS_PE 8
181 #define DIGI_READ_INPUT_SIGNALS_CTS 16
182 #define DIGI_READ_INPUT_SIGNALS_DSR 32
183 #define DIGI_READ_INPUT_SIGNALS_RI 64
184 #define DIGI_READ_INPUT_SIGNALS_DCD 128
185
186
187 /* Structures */
188
189 struct digi_serial {
190 spinlock_t ds_serial_lock;
191 struct usb_serial_port *ds_oob_port; /* out-of-band port */
192 int ds_oob_port_num; /* index of out-of-band port */
193 int ds_device_started;
194 };
195
196 struct digi_port {
197 spinlock_t dp_port_lock;
198 int dp_port_num;
199 int dp_out_buf_len;
200 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
201 int dp_write_urb_in_use;
202 unsigned int dp_modem_signals;
203 wait_queue_head_t dp_modem_change_wait;
204 int dp_transmit_idle;
205 wait_queue_head_t dp_transmit_idle_wait;
206 int dp_throttled;
207 int dp_throttle_restart;
208 wait_queue_head_t dp_flush_wait;
209 wait_queue_head_t dp_close_wait; /* wait queue for close */
210 struct work_struct dp_wakeup_work;
211 struct usb_serial_port *dp_port;
212 };
213
214
215 /* Local Function Declarations */
216
217 static void digi_wakeup_write(struct usb_serial_port *port);
218 static void digi_wakeup_write_lock(struct work_struct *work);
219 static int digi_write_oob_command(struct usb_serial_port *port,
220 unsigned char *buf, int count, int interruptible);
221 static int digi_write_inb_command(struct usb_serial_port *port,
222 unsigned char *buf, int count, unsigned long timeout);
223 static int digi_set_modem_signals(struct usb_serial_port *port,
224 unsigned int modem_signals, int interruptible);
225 static int digi_transmit_idle(struct usb_serial_port *port,
226 unsigned long timeout);
227 static void digi_rx_throttle(struct tty_struct *tty);
228 static void digi_rx_unthrottle(struct tty_struct *tty);
229 static void digi_set_termios(struct tty_struct *tty,
230 struct usb_serial_port *port, struct ktermios *old_termios);
231 static void digi_break_ctl(struct tty_struct *tty, int break_state);
232 static int digi_tiocmget(struct tty_struct *tty);
233 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
234 unsigned int clear);
235 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
236 const unsigned char *buf, int count);
237 static void digi_write_bulk_callback(struct urb *urb);
238 static int digi_write_room(struct tty_struct *tty);
239 static int digi_chars_in_buffer(struct tty_struct *tty);
240 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
241 static void digi_close(struct usb_serial_port *port);
242 static void digi_dtr_rts(struct usb_serial_port *port, int on);
243 static int digi_startup_device(struct usb_serial *serial);
244 static int digi_startup(struct usb_serial *serial);
245 static void digi_disconnect(struct usb_serial *serial);
246 static void digi_release(struct usb_serial *serial);
247 static void digi_read_bulk_callback(struct urb *urb);
248 static int digi_read_inb_callback(struct urb *urb);
249 static int digi_read_oob_callback(struct urb *urb);
250
251
252 /* Statics */
253
254 static bool debug;
255
256 static const struct usb_device_id id_table_combined[] = {
257 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
258 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
259 { } /* Terminating entry */
260 };
261
262 static const struct usb_device_id id_table_2[] = {
263 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
264 { } /* Terminating entry */
265 };
266
267 static const struct usb_device_id id_table_4[] = {
268 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
269 { } /* Terminating entry */
270 };
271
272 MODULE_DEVICE_TABLE(usb, id_table_combined);
273
274 /* device info needed for the Digi serial converter */
275
276 static struct usb_serial_driver digi_acceleport_2_device = {
277 .driver = {
278 .owner = THIS_MODULE,
279 .name = "digi_2",
280 },
281 .description = "Digi 2 port USB adapter",
282 .id_table = id_table_2,
283 .num_ports = 3,
284 .open = digi_open,
285 .close = digi_close,
286 .dtr_rts = digi_dtr_rts,
287 .write = digi_write,
288 .write_room = digi_write_room,
289 .write_bulk_callback = digi_write_bulk_callback,
290 .read_bulk_callback = digi_read_bulk_callback,
291 .chars_in_buffer = digi_chars_in_buffer,
292 .throttle = digi_rx_throttle,
293 .unthrottle = digi_rx_unthrottle,
294 .set_termios = digi_set_termios,
295 .break_ctl = digi_break_ctl,
296 .tiocmget = digi_tiocmget,
297 .tiocmset = digi_tiocmset,
298 .attach = digi_startup,
299 .disconnect = digi_disconnect,
300 .release = digi_release,
301 };
302
303 static struct usb_serial_driver digi_acceleport_4_device = {
304 .driver = {
305 .owner = THIS_MODULE,
306 .name = "digi_4",
307 },
308 .description = "Digi 4 port USB adapter",
309 .id_table = id_table_4,
310 .num_ports = 4,
311 .open = digi_open,
312 .close = digi_close,
313 .write = digi_write,
314 .write_room = digi_write_room,
315 .write_bulk_callback = digi_write_bulk_callback,
316 .read_bulk_callback = digi_read_bulk_callback,
317 .chars_in_buffer = digi_chars_in_buffer,
318 .throttle = digi_rx_throttle,
319 .unthrottle = digi_rx_unthrottle,
320 .set_termios = digi_set_termios,
321 .break_ctl = digi_break_ctl,
322 .tiocmget = digi_tiocmget,
323 .tiocmset = digi_tiocmset,
324 .attach = digi_startup,
325 .disconnect = digi_disconnect,
326 .release = digi_release,
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 digi_wakeup_write(port);
380 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
381 }
382
383 static void digi_wakeup_write(struct usb_serial_port *port)
384 {
385 struct tty_struct *tty = tty_port_tty_get(&port->port);
386 if (tty) {
387 tty_wakeup(tty);
388 tty_kref_put(tty);
389 }
390 }
391
392
393 /*
394 * Digi Write OOB Command
395 *
396 * Write commands on the out of band port. Commands are 4
397 * bytes each, multiple commands can be sent at once, and
398 * no command will be split across USB packets. Returns 0
399 * if successful, -EINTR if interrupted while sleeping and
400 * the interruptible flag is true, or a negative error
401 * returned by usb_submit_urb.
402 */
403
404 static int digi_write_oob_command(struct usb_serial_port *port,
405 unsigned char *buf, int count, int interruptible)
406 {
407
408 int ret = 0;
409 int len;
410 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
411 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
412 unsigned long flags = 0;
413
414 dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
415
416 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
417 while (count > 0) {
418 while (oob_priv->dp_write_urb_in_use) {
419 cond_wait_interruptible_timeout_irqrestore(
420 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
421 &oob_priv->dp_port_lock, flags);
422 if (interruptible && signal_pending(current))
423 return -EINTR;
424 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
425 }
426
427 /* len must be a multiple of 4, so commands are not split */
428 len = min(count, oob_port->bulk_out_size);
429 if (len > 4)
430 len &= ~3;
431 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
432 oob_port->write_urb->transfer_buffer_length = len;
433 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
434 if (ret == 0) {
435 oob_priv->dp_write_urb_in_use = 1;
436 count -= len;
437 buf += len;
438 }
439 }
440 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
441 if (ret)
442 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
443 __func__, ret);
444 return ret;
445
446 }
447
448
449 /*
450 * Digi Write In Band Command
451 *
452 * Write commands on the given port. Commands are 4
453 * bytes each, multiple commands can be sent at once, and
454 * no command will be split across USB packets. If timeout
455 * is non-zero, write in band command will return after
456 * waiting unsuccessfully for the URB status to clear for
457 * timeout ticks. Returns 0 if successful, or a negative
458 * error returned by digi_write.
459 */
460
461 static int digi_write_inb_command(struct usb_serial_port *port,
462 unsigned char *buf, int count, unsigned long timeout)
463 {
464 int ret = 0;
465 int len;
466 struct digi_port *priv = usb_get_serial_port_data(port);
467 unsigned char *data = port->write_urb->transfer_buffer;
468 unsigned long flags = 0;
469
470 dbg("digi_write_inb_command: TOP: port=%d, count=%d",
471 priv->dp_port_num, count);
472
473 if (timeout)
474 timeout += jiffies;
475 else
476 timeout = ULONG_MAX;
477
478 spin_lock_irqsave(&priv->dp_port_lock, flags);
479 while (count > 0 && ret == 0) {
480 while (priv->dp_write_urb_in_use &&
481 time_before(jiffies, timeout)) {
482 cond_wait_interruptible_timeout_irqrestore(
483 &port->write_wait, DIGI_RETRY_TIMEOUT,
484 &priv->dp_port_lock, flags);
485 if (signal_pending(current))
486 return -EINTR;
487 spin_lock_irqsave(&priv->dp_port_lock, flags);
488 }
489
490 /* len must be a multiple of 4 and small enough to */
491 /* guarantee the write will send buffered data first, */
492 /* so commands are in order with data and not split */
493 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
494 if (len > 4)
495 len &= ~3;
496
497 /* write any buffered data first */
498 if (priv->dp_out_buf_len > 0) {
499 data[0] = DIGI_CMD_SEND_DATA;
500 data[1] = priv->dp_out_buf_len;
501 memcpy(data + 2, priv->dp_out_buf,
502 priv->dp_out_buf_len);
503 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
504 port->write_urb->transfer_buffer_length
505 = priv->dp_out_buf_len + 2 + len;
506 } else {
507 memcpy(data, buf, len);
508 port->write_urb->transfer_buffer_length = len;
509 }
510
511 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
512 if (ret == 0) {
513 priv->dp_write_urb_in_use = 1;
514 priv->dp_out_buf_len = 0;
515 count -= len;
516 buf += len;
517 }
518
519 }
520 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
521
522 if (ret)
523 dev_err(&port->dev,
524 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
525 __func__, ret, priv->dp_port_num);
526 return ret;
527 }
528
529
530 /*
531 * Digi Set Modem Signals
532 *
533 * Sets or clears DTR and RTS on the port, according to the
534 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
535 * for the modem_signals argument. Returns 0 if successful,
536 * -EINTR if interrupted while sleeping, or a non-zero error
537 * returned by usb_submit_urb.
538 */
539
540 static int digi_set_modem_signals(struct usb_serial_port *port,
541 unsigned int modem_signals, int interruptible)
542 {
543
544 int ret;
545 struct digi_port *port_priv = usb_get_serial_port_data(port);
546 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
547 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
548 unsigned char *data = oob_port->write_urb->transfer_buffer;
549 unsigned long flags = 0;
550
551
552 dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
553 port_priv->dp_port_num, modem_signals);
554
555 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
556 spin_lock(&port_priv->dp_port_lock);
557
558 while (oob_priv->dp_write_urb_in_use) {
559 spin_unlock(&port_priv->dp_port_lock);
560 cond_wait_interruptible_timeout_irqrestore(
561 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
562 &oob_priv->dp_port_lock, flags);
563 if (interruptible && signal_pending(current))
564 return -EINTR;
565 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
566 spin_lock(&port_priv->dp_port_lock);
567 }
568 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
569 data[1] = port_priv->dp_port_num;
570 data[2] = (modem_signals & TIOCM_DTR) ?
571 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
572 data[3] = 0;
573 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
574 data[5] = port_priv->dp_port_num;
575 data[6] = (modem_signals & TIOCM_RTS) ?
576 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
577 data[7] = 0;
578
579 oob_port->write_urb->transfer_buffer_length = 8;
580
581 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
582 if (ret == 0) {
583 oob_priv->dp_write_urb_in_use = 1;
584 port_priv->dp_modem_signals =
585 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
586 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
587 }
588 spin_unlock(&port_priv->dp_port_lock);
589 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
590 if (ret)
591 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
592 __func__, ret);
593 return ret;
594 }
595
596 /*
597 * Digi Transmit Idle
598 *
599 * Digi transmit idle waits, up to timeout ticks, for the transmitter
600 * to go idle. It returns 0 if successful or a negative error.
601 *
602 * There are race conditions here if more than one process is calling
603 * digi_transmit_idle on the same port at the same time. However, this
604 * is only called from close, and only one process can be in close on a
605 * port at a time, so its ok.
606 */
607
608 static int digi_transmit_idle(struct usb_serial_port *port,
609 unsigned long timeout)
610 {
611 int ret;
612 unsigned char buf[2];
613 struct digi_port *priv = usb_get_serial_port_data(port);
614 unsigned long flags = 0;
615
616 spin_lock_irqsave(&priv->dp_port_lock, flags);
617 priv->dp_transmit_idle = 0;
618 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
619
620 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
621 buf[1] = 0;
622
623 timeout += jiffies;
624
625 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
626 if (ret != 0)
627 return ret;
628
629 spin_lock_irqsave(&priv->dp_port_lock, flags);
630
631 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
632 cond_wait_interruptible_timeout_irqrestore(
633 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
634 &priv->dp_port_lock, flags);
635 if (signal_pending(current))
636 return -EINTR;
637 spin_lock_irqsave(&priv->dp_port_lock, flags);
638 }
639 priv->dp_transmit_idle = 0;
640 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
641 return 0;
642
643 }
644
645
646 static void digi_rx_throttle(struct tty_struct *tty)
647 {
648 unsigned long flags;
649 struct usb_serial_port *port = tty->driver_data;
650 struct digi_port *priv = usb_get_serial_port_data(port);
651
652 /* stop receiving characters by not resubmitting the read urb */
653 spin_lock_irqsave(&priv->dp_port_lock, flags);
654 priv->dp_throttled = 1;
655 priv->dp_throttle_restart = 0;
656 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
657 }
658
659
660 static void digi_rx_unthrottle(struct tty_struct *tty)
661 {
662 int ret = 0;
663 unsigned long flags;
664 struct usb_serial_port *port = tty->driver_data;
665 struct digi_port *priv = usb_get_serial_port_data(port);
666
667 spin_lock_irqsave(&priv->dp_port_lock, flags);
668
669 /* restart read chain */
670 if (priv->dp_throttle_restart)
671 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
672
673 /* turn throttle off */
674 priv->dp_throttled = 0;
675 priv->dp_throttle_restart = 0;
676
677 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
678
679 if (ret)
680 dev_err(&port->dev,
681 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
682 __func__, ret, priv->dp_port_num);
683 }
684
685
686 static void digi_set_termios(struct tty_struct *tty,
687 struct usb_serial_port *port, struct ktermios *old_termios)
688 {
689 struct digi_port *priv = usb_get_serial_port_data(port);
690 unsigned int iflag = tty->termios.c_iflag;
691 unsigned int cflag = tty->termios.c_cflag;
692 unsigned int old_iflag = old_termios->c_iflag;
693 unsigned int old_cflag = old_termios->c_cflag;
694 unsigned char buf[32];
695 unsigned int modem_signals;
696 int arg, ret;
697 int i = 0;
698 speed_t baud;
699
700 dbg("digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x", priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
701
702 /* set baud rate */
703 baud = tty_get_baud_rate(tty);
704 if (baud != tty_termios_baud_rate(old_termios)) {
705 arg = -1;
706
707 /* reassert DTR and (maybe) RTS on transition from B0 */
708 if ((old_cflag&CBAUD) == B0) {
709 /* don't set RTS if using hardware flow control */
710 /* and throttling input */
711 modem_signals = TIOCM_DTR;
712 if (!(tty->termios.c_cflag & CRTSCTS) ||
713 !test_bit(TTY_THROTTLED, &tty->flags))
714 modem_signals |= TIOCM_RTS;
715 digi_set_modem_signals(port, modem_signals, 1);
716 }
717 switch (baud) {
718 /* drop DTR and RTS on transition to B0 */
719 case 0: digi_set_modem_signals(port, 0, 1); break;
720 case 50: arg = DIGI_BAUD_50; break;
721 case 75: arg = DIGI_BAUD_75; break;
722 case 110: arg = DIGI_BAUD_110; break;
723 case 150: arg = DIGI_BAUD_150; break;
724 case 200: arg = DIGI_BAUD_200; break;
725 case 300: arg = DIGI_BAUD_300; break;
726 case 600: arg = DIGI_BAUD_600; break;
727 case 1200: arg = DIGI_BAUD_1200; break;
728 case 1800: arg = DIGI_BAUD_1800; break;
729 case 2400: arg = DIGI_BAUD_2400; break;
730 case 4800: arg = DIGI_BAUD_4800; break;
731 case 9600: arg = DIGI_BAUD_9600; break;
732 case 19200: arg = DIGI_BAUD_19200; break;
733 case 38400: arg = DIGI_BAUD_38400; break;
734 case 57600: arg = DIGI_BAUD_57600; break;
735 case 115200: arg = DIGI_BAUD_115200; break;
736 case 230400: arg = DIGI_BAUD_230400; break;
737 case 460800: arg = DIGI_BAUD_460800; break;
738 default:
739 arg = DIGI_BAUD_9600;
740 baud = 9600;
741 break;
742 }
743 if (arg != -1) {
744 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
745 buf[i++] = priv->dp_port_num;
746 buf[i++] = arg;
747 buf[i++] = 0;
748 }
749 }
750 /* set parity */
751 tty->termios.c_cflag &= ~CMSPAR;
752
753 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
754 if (cflag&PARENB) {
755 if (cflag&PARODD)
756 arg = DIGI_PARITY_ODD;
757 else
758 arg = DIGI_PARITY_EVEN;
759 } else {
760 arg = DIGI_PARITY_NONE;
761 }
762 buf[i++] = DIGI_CMD_SET_PARITY;
763 buf[i++] = priv->dp_port_num;
764 buf[i++] = arg;
765 buf[i++] = 0;
766 }
767 /* set word size */
768 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
769 arg = -1;
770 switch (cflag&CSIZE) {
771 case CS5: arg = DIGI_WORD_SIZE_5; break;
772 case CS6: arg = DIGI_WORD_SIZE_6; break;
773 case CS7: arg = DIGI_WORD_SIZE_7; break;
774 case CS8: arg = DIGI_WORD_SIZE_8; break;
775 default:
776 dbg("digi_set_termios: can't handle word size %d",
777 (cflag&CSIZE));
778 break;
779 }
780
781 if (arg != -1) {
782 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
783 buf[i++] = priv->dp_port_num;
784 buf[i++] = arg;
785 buf[i++] = 0;
786 }
787
788 }
789
790 /* set stop bits */
791 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
792
793 if ((cflag&CSTOPB))
794 arg = DIGI_STOP_BITS_2;
795 else
796 arg = DIGI_STOP_BITS_1;
797
798 buf[i++] = DIGI_CMD_SET_STOP_BITS;
799 buf[i++] = priv->dp_port_num;
800 buf[i++] = arg;
801 buf[i++] = 0;
802
803 }
804
805 /* set input flow control */
806 if ((iflag&IXOFF) != (old_iflag&IXOFF)
807 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
808 arg = 0;
809 if (iflag&IXOFF)
810 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
811 else
812 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
813
814 if (cflag&CRTSCTS) {
815 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
816
817 /* On USB-4 it is necessary to assert RTS prior */
818 /* to selecting RTS input flow control. */
819 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
820 buf[i++] = priv->dp_port_num;
821 buf[i++] = DIGI_RTS_ACTIVE;
822 buf[i++] = 0;
823
824 } else {
825 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
826 }
827 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
828 buf[i++] = priv->dp_port_num;
829 buf[i++] = arg;
830 buf[i++] = 0;
831 }
832
833 /* set output flow control */
834 if ((iflag & IXON) != (old_iflag & IXON)
835 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
836 arg = 0;
837 if (iflag & IXON)
838 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
839 else
840 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
841
842 if (cflag & CRTSCTS) {
843 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
844 } else {
845 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
846 tty->hw_stopped = 0;
847 }
848
849 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
850 buf[i++] = priv->dp_port_num;
851 buf[i++] = arg;
852 buf[i++] = 0;
853 }
854
855 /* set receive enable/disable */
856 if ((cflag & CREAD) != (old_cflag & CREAD)) {
857 if (cflag & CREAD)
858 arg = DIGI_ENABLE;
859 else
860 arg = DIGI_DISABLE;
861
862 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
863 buf[i++] = priv->dp_port_num;
864 buf[i++] = arg;
865 buf[i++] = 0;
866 }
867 ret = digi_write_oob_command(port, buf, i, 1);
868 if (ret != 0)
869 dbg("digi_set_termios: write oob failed, ret=%d", ret);
870 tty_encode_baud_rate(tty, baud, baud);
871 }
872
873
874 static void digi_break_ctl(struct tty_struct *tty, int break_state)
875 {
876 struct usb_serial_port *port = tty->driver_data;
877 unsigned char buf[4];
878
879 buf[0] = DIGI_CMD_BREAK_CONTROL;
880 buf[1] = 2; /* length */
881 buf[2] = break_state ? 1 : 0;
882 buf[3] = 0; /* pad */
883 digi_write_inb_command(port, buf, 4, 0);
884 }
885
886
887 static int digi_tiocmget(struct tty_struct *tty)
888 {
889 struct usb_serial_port *port = tty->driver_data;
890 struct digi_port *priv = usb_get_serial_port_data(port);
891 unsigned int val;
892 unsigned long flags;
893
894 spin_lock_irqsave(&priv->dp_port_lock, flags);
895 val = priv->dp_modem_signals;
896 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
897 return val;
898 }
899
900
901 static int digi_tiocmset(struct tty_struct *tty,
902 unsigned int set, unsigned int clear)
903 {
904 struct usb_serial_port *port = tty->driver_data;
905 struct digi_port *priv = usb_get_serial_port_data(port);
906 unsigned int val;
907 unsigned long flags;
908
909 spin_lock_irqsave(&priv->dp_port_lock, flags);
910 val = (priv->dp_modem_signals & ~clear) | set;
911 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
912 return digi_set_modem_signals(port, val, 1);
913 }
914
915
916 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
917 const unsigned char *buf, int count)
918 {
919
920 int ret, data_len, new_len;
921 struct digi_port *priv = usb_get_serial_port_data(port);
922 unsigned char *data = port->write_urb->transfer_buffer;
923 unsigned long flags = 0;
924
925 dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
926 priv->dp_port_num, count, in_interrupt());
927
928 /* copy user data (which can sleep) before getting spin lock */
929 count = min(count, port->bulk_out_size-2);
930 count = min(64, count);
931
932 /* be sure only one write proceeds at a time */
933 /* there are races on the port private buffer */
934 spin_lock_irqsave(&priv->dp_port_lock, flags);
935
936 /* wait for urb status clear to submit another urb */
937 if (priv->dp_write_urb_in_use) {
938 /* buffer data if count is 1 (probably put_char) if possible */
939 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
940 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
941 new_len = 1;
942 } else {
943 new_len = 0;
944 }
945 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
946 return new_len;
947 }
948
949 /* allow space for any buffered data and for new data, up to */
950 /* transfer buffer size - 2 (for command and length bytes) */
951 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
952 data_len = new_len + priv->dp_out_buf_len;
953
954 if (data_len == 0) {
955 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
956 return 0;
957 }
958
959 port->write_urb->transfer_buffer_length = data_len+2;
960
961 *data++ = DIGI_CMD_SEND_DATA;
962 *data++ = data_len;
963
964 /* copy in buffered data first */
965 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
966 data += priv->dp_out_buf_len;
967
968 /* copy in new data */
969 memcpy(data, buf, new_len);
970
971 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
972 if (ret == 0) {
973 priv->dp_write_urb_in_use = 1;
974 ret = new_len;
975 priv->dp_out_buf_len = 0;
976 }
977
978 /* return length of new data written, or error */
979 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
980 if (ret < 0)
981 dev_err_console(port,
982 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
983 __func__, ret, priv->dp_port_num);
984 dbg("digi_write: returning %d", ret);
985 return ret;
986
987 }
988
989 static void digi_write_bulk_callback(struct urb *urb)
990 {
991
992 struct usb_serial_port *port = urb->context;
993 struct usb_serial *serial;
994 struct digi_port *priv;
995 struct digi_serial *serial_priv;
996 int ret = 0;
997 int status = urb->status;
998
999 /* port and serial sanity check */
1000 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1001 pr_err("%s: port or port->private is NULL, status=%d\n",
1002 __func__, status);
1003 return;
1004 }
1005 serial = port->serial;
1006 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
1007 dev_err(&port->dev,
1008 "%s: serial or serial->private is NULL, status=%d\n",
1009 __func__, status);
1010 return;
1011 }
1012
1013 /* handle oob callback */
1014 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1015 dbg("digi_write_bulk_callback: oob callback");
1016 spin_lock(&priv->dp_port_lock);
1017 priv->dp_write_urb_in_use = 0;
1018 wake_up_interruptible(&port->write_wait);
1019 spin_unlock(&priv->dp_port_lock);
1020 return;
1021 }
1022
1023 /* try to send any buffered data on this port */
1024 spin_lock(&priv->dp_port_lock);
1025 priv->dp_write_urb_in_use = 0;
1026 if (priv->dp_out_buf_len > 0) {
1027 *((unsigned char *)(port->write_urb->transfer_buffer))
1028 = (unsigned char)DIGI_CMD_SEND_DATA;
1029 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1030 = (unsigned char)priv->dp_out_buf_len;
1031 port->write_urb->transfer_buffer_length =
1032 priv->dp_out_buf_len + 2;
1033 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1034 priv->dp_out_buf_len);
1035 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1036 if (ret == 0) {
1037 priv->dp_write_urb_in_use = 1;
1038 priv->dp_out_buf_len = 0;
1039 }
1040 }
1041 /* wake up processes sleeping on writes immediately */
1042 digi_wakeup_write(port);
1043 /* also queue up a wakeup at scheduler time, in case we */
1044 /* lost the race in write_chan(). */
1045 schedule_work(&priv->dp_wakeup_work);
1046
1047 spin_unlock(&priv->dp_port_lock);
1048 if (ret && ret != -EPERM)
1049 dev_err_console(port,
1050 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1051 __func__, ret, priv->dp_port_num);
1052 }
1053
1054 static int digi_write_room(struct tty_struct *tty)
1055 {
1056 struct usb_serial_port *port = tty->driver_data;
1057 struct digi_port *priv = usb_get_serial_port_data(port);
1058 int room;
1059 unsigned long flags = 0;
1060
1061 spin_lock_irqsave(&priv->dp_port_lock, flags);
1062
1063 if (priv->dp_write_urb_in_use)
1064 room = 0;
1065 else
1066 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1067
1068 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1069 dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
1070 return room;
1071
1072 }
1073
1074 static int digi_chars_in_buffer(struct tty_struct *tty)
1075 {
1076 struct usb_serial_port *port = tty->driver_data;
1077 struct digi_port *priv = usb_get_serial_port_data(port);
1078
1079 if (priv->dp_write_urb_in_use) {
1080 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1081 priv->dp_port_num, port->bulk_out_size - 2);
1082 /* return(port->bulk_out_size - 2); */
1083 return 256;
1084 } else {
1085 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1086 priv->dp_port_num, priv->dp_out_buf_len);
1087 return priv->dp_out_buf_len;
1088 }
1089
1090 }
1091
1092 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1093 {
1094 /* Adjust DTR and RTS */
1095 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1096 }
1097
1098 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1099 {
1100 int ret;
1101 unsigned char buf[32];
1102 struct digi_port *priv = usb_get_serial_port_data(port);
1103 struct ktermios not_termios;
1104
1105 /* be sure the device is started up */
1106 if (digi_startup_device(port->serial) != 0)
1107 return -ENXIO;
1108
1109 /* read modem signals automatically whenever they change */
1110 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1111 buf[1] = priv->dp_port_num;
1112 buf[2] = DIGI_ENABLE;
1113 buf[3] = 0;
1114
1115 /* flush fifos */
1116 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1117 buf[5] = priv->dp_port_num;
1118 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1119 buf[7] = 0;
1120
1121 ret = digi_write_oob_command(port, buf, 8, 1);
1122 if (ret != 0)
1123 dbg("digi_open: write oob failed, ret=%d", ret);
1124
1125 /* set termios settings */
1126 if (tty) {
1127 not_termios.c_cflag = ~tty->termios.c_cflag;
1128 not_termios.c_iflag = ~tty->termios.c_iflag;
1129 digi_set_termios(tty, port, &not_termios);
1130 }
1131 return 0;
1132 }
1133
1134
1135 static void digi_close(struct usb_serial_port *port)
1136 {
1137 DEFINE_WAIT(wait);
1138 int ret;
1139 unsigned char buf[32];
1140 struct digi_port *priv = usb_get_serial_port_data(port);
1141
1142 mutex_lock(&port->serial->disc_mutex);
1143 /* if disconnected, just clear flags */
1144 if (port->serial->disconnected)
1145 goto exit;
1146
1147 if (port->serial->dev) {
1148 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1149 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1150
1151 /* disable input flow control */
1152 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1153 buf[1] = priv->dp_port_num;
1154 buf[2] = DIGI_DISABLE;
1155 buf[3] = 0;
1156
1157 /* disable output flow control */
1158 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1159 buf[5] = priv->dp_port_num;
1160 buf[6] = DIGI_DISABLE;
1161 buf[7] = 0;
1162
1163 /* disable reading modem signals automatically */
1164 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1165 buf[9] = priv->dp_port_num;
1166 buf[10] = DIGI_DISABLE;
1167 buf[11] = 0;
1168
1169 /* disable receive */
1170 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1171 buf[13] = priv->dp_port_num;
1172 buf[14] = DIGI_DISABLE;
1173 buf[15] = 0;
1174
1175 /* flush fifos */
1176 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1177 buf[17] = priv->dp_port_num;
1178 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1179 buf[19] = 0;
1180
1181 ret = digi_write_oob_command(port, buf, 20, 0);
1182 if (ret != 0)
1183 dbg("digi_close: write oob failed, ret=%d", ret);
1184
1185 /* wait for final commands on oob port to complete */
1186 prepare_to_wait(&priv->dp_flush_wait, &wait,
1187 TASK_INTERRUPTIBLE);
1188 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1189 finish_wait(&priv->dp_flush_wait, &wait);
1190
1191 /* shutdown any outstanding bulk writes */
1192 usb_kill_urb(port->write_urb);
1193 }
1194 exit:
1195 spin_lock_irq(&priv->dp_port_lock);
1196 priv->dp_write_urb_in_use = 0;
1197 wake_up_interruptible(&priv->dp_close_wait);
1198 spin_unlock_irq(&priv->dp_port_lock);
1199 mutex_unlock(&port->serial->disc_mutex);
1200 }
1201
1202
1203 /*
1204 * Digi Startup Device
1205 *
1206 * Starts reads on all ports. Must be called AFTER startup, with
1207 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1208 */
1209
1210 static int digi_startup_device(struct usb_serial *serial)
1211 {
1212 int i, ret = 0;
1213 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1214 struct usb_serial_port *port;
1215
1216 /* be sure this happens exactly once */
1217 spin_lock(&serial_priv->ds_serial_lock);
1218 if (serial_priv->ds_device_started) {
1219 spin_unlock(&serial_priv->ds_serial_lock);
1220 return 0;
1221 }
1222 serial_priv->ds_device_started = 1;
1223 spin_unlock(&serial_priv->ds_serial_lock);
1224
1225 /* start reading from each bulk in endpoint for the device */
1226 /* set USB_DISABLE_SPD flag for write bulk urbs */
1227 for (i = 0; i < serial->type->num_ports + 1; i++) {
1228 port = serial->port[i];
1229 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1230 if (ret != 0) {
1231 dev_err(&port->dev,
1232 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1233 __func__, ret, i);
1234 break;
1235 }
1236 }
1237 return ret;
1238 }
1239
1240
1241 static int digi_startup(struct usb_serial *serial)
1242 {
1243
1244 int i;
1245 struct digi_port *priv;
1246 struct digi_serial *serial_priv;
1247
1248 /* allocate the private data structures for all ports */
1249 /* number of regular ports + 1 for the out-of-band port */
1250 for (i = 0; i < serial->type->num_ports + 1; i++) {
1251 /* allocate port private structure */
1252 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1253 if (priv == NULL) {
1254 while (--i >= 0)
1255 kfree(usb_get_serial_port_data(serial->port[i]));
1256 return 1; /* error */
1257 }
1258
1259 /* initialize port private structure */
1260 spin_lock_init(&priv->dp_port_lock);
1261 priv->dp_port_num = i;
1262 priv->dp_out_buf_len = 0;
1263 priv->dp_write_urb_in_use = 0;
1264 priv->dp_modem_signals = 0;
1265 init_waitqueue_head(&priv->dp_modem_change_wait);
1266 priv->dp_transmit_idle = 0;
1267 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1268 priv->dp_throttled = 0;
1269 priv->dp_throttle_restart = 0;
1270 init_waitqueue_head(&priv->dp_flush_wait);
1271 init_waitqueue_head(&priv->dp_close_wait);
1272 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1273 priv->dp_port = serial->port[i];
1274 /* initialize write wait queue for this port */
1275 init_waitqueue_head(&serial->port[i]->write_wait);
1276
1277 usb_set_serial_port_data(serial->port[i], priv);
1278 }
1279
1280 /* allocate serial private structure */
1281 serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1282 if (serial_priv == NULL) {
1283 for (i = 0; i < serial->type->num_ports + 1; i++)
1284 kfree(usb_get_serial_port_data(serial->port[i]));
1285 return 1; /* error */
1286 }
1287
1288 /* initialize serial private structure */
1289 spin_lock_init(&serial_priv->ds_serial_lock);
1290 serial_priv->ds_oob_port_num = serial->type->num_ports;
1291 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1292 serial_priv->ds_device_started = 0;
1293 usb_set_serial_data(serial, serial_priv);
1294
1295 return 0;
1296 }
1297
1298
1299 static void digi_disconnect(struct usb_serial *serial)
1300 {
1301 int i;
1302
1303 /* stop reads and writes on all ports */
1304 for (i = 0; i < serial->type->num_ports + 1; i++) {
1305 usb_kill_urb(serial->port[i]->read_urb);
1306 usb_kill_urb(serial->port[i]->write_urb);
1307 }
1308 }
1309
1310
1311 static void digi_release(struct usb_serial *serial)
1312 {
1313 int i;
1314
1315 /* free the private data structures for all ports */
1316 /* number of regular ports + 1 for the out-of-band port */
1317 for (i = 0; i < serial->type->num_ports + 1; i++)
1318 kfree(usb_get_serial_port_data(serial->port[i]));
1319 kfree(usb_get_serial_data(serial));
1320 }
1321
1322
1323 static void digi_read_bulk_callback(struct urb *urb)
1324 {
1325 struct usb_serial_port *port = urb->context;
1326 struct digi_port *priv;
1327 struct digi_serial *serial_priv;
1328 int ret;
1329 int status = urb->status;
1330
1331 /* port sanity check, do not resubmit if port is not valid */
1332 if (port == NULL)
1333 return;
1334 priv = usb_get_serial_port_data(port);
1335 if (priv == NULL) {
1336 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1337 __func__, status);
1338 return;
1339 }
1340 if (port->serial == NULL ||
1341 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1342 dev_err(&port->dev, "%s: serial is bad or serial->private "
1343 "is NULL, status=%d\n", __func__, status);
1344 return;
1345 }
1346
1347 /* do not resubmit urb if it has any status error */
1348 if (status) {
1349 dev_err(&port->dev,
1350 "%s: nonzero read bulk status: status=%d, port=%d\n",
1351 __func__, status, priv->dp_port_num);
1352 return;
1353 }
1354
1355 /* handle oob or inb callback, do not resubmit if error */
1356 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1357 if (digi_read_oob_callback(urb) != 0)
1358 return;
1359 } else {
1360 if (digi_read_inb_callback(urb) != 0)
1361 return;
1362 }
1363
1364 /* continue read */
1365 ret = usb_submit_urb(urb, GFP_ATOMIC);
1366 if (ret != 0 && ret != -EPERM) {
1367 dev_err(&port->dev,
1368 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1369 __func__, ret, priv->dp_port_num);
1370 }
1371
1372 }
1373
1374 /*
1375 * Digi Read INB Callback
1376 *
1377 * Digi Read INB Callback handles reads on the in band ports, sending
1378 * the data on to the tty subsystem. When called we know port and
1379 * port->private are not NULL and port->serial has been validated.
1380 * It returns 0 if successful, 1 if successful but the port is
1381 * throttled, and -1 if the sanity checks failed.
1382 */
1383
1384 static int digi_read_inb_callback(struct urb *urb)
1385 {
1386
1387 struct usb_serial_port *port = urb->context;
1388 struct tty_struct *tty;
1389 struct digi_port *priv = usb_get_serial_port_data(port);
1390 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1391 int len = ((unsigned char *)urb->transfer_buffer)[1];
1392 int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1393 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1394 int flag, throttled;
1395 int status = urb->status;
1396
1397 /* do not process callbacks on closed ports */
1398 /* but do continue the read chain */
1399 if (urb->status == -ENOENT)
1400 return 0;
1401
1402 /* short/multiple packet check */
1403 if (urb->actual_length != len + 2) {
1404 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1405 "status=%d, port=%d, opcode=%d, len=%d, "
1406 "actual_length=%d, status=%d\n", __func__, status,
1407 priv->dp_port_num, opcode, len, urb->actual_length,
1408 port_status);
1409 return -1;
1410 }
1411
1412 tty = tty_port_tty_get(&port->port);
1413 spin_lock(&priv->dp_port_lock);
1414
1415 /* check for throttle; if set, do not resubmit read urb */
1416 /* indicate the read chain needs to be restarted on unthrottle */
1417 throttled = priv->dp_throttled;
1418 if (throttled)
1419 priv->dp_throttle_restart = 1;
1420
1421 /* receive data */
1422 if (tty && opcode == DIGI_CMD_RECEIVE_DATA) {
1423 /* get flag from port_status */
1424 flag = 0;
1425
1426 /* overrun is special, not associated with a char */
1427 if (port_status & DIGI_OVERRUN_ERROR)
1428 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1429
1430 /* break takes precedence over parity, */
1431 /* which takes precedence over framing errors */
1432 if (port_status & DIGI_BREAK_ERROR)
1433 flag = TTY_BREAK;
1434 else if (port_status & DIGI_PARITY_ERROR)
1435 flag = TTY_PARITY;
1436 else if (port_status & DIGI_FRAMING_ERROR)
1437 flag = TTY_FRAME;
1438
1439 /* data length is len-1 (one byte of len is port_status) */
1440 --len;
1441 if (len > 0) {
1442 tty_insert_flip_string_fixed_flag(tty, data, flag,
1443 len);
1444 tty_flip_buffer_push(tty);
1445 }
1446 }
1447 spin_unlock(&priv->dp_port_lock);
1448 tty_kref_put(tty);
1449
1450 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1451 dbg("%s: got RECEIVE_DISABLE", __func__);
1452 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1453 dbg("%s: unknown opcode: %d", __func__, opcode);
1454
1455 return throttled ? 1 : 0;
1456
1457 }
1458
1459
1460 /*
1461 * Digi Read OOB Callback
1462 *
1463 * Digi Read OOB Callback handles reads on the out of band port.
1464 * When called we know port and port->private are not NULL and
1465 * the port->serial is valid. It returns 0 if successful, and
1466 * -1 if the sanity checks failed.
1467 */
1468
1469 static int digi_read_oob_callback(struct urb *urb)
1470 {
1471
1472 struct usb_serial_port *port = urb->context;
1473 struct usb_serial *serial = port->serial;
1474 struct tty_struct *tty;
1475 struct digi_port *priv = usb_get_serial_port_data(port);
1476 int opcode, line, status, val;
1477 int i;
1478 unsigned int rts;
1479
1480 /* handle each oob command */
1481 for (i = 0; i < urb->actual_length - 3;) {
1482 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1483 line = ((unsigned char *)urb->transfer_buffer)[i++];
1484 status = ((unsigned char *)urb->transfer_buffer)[i++];
1485 val = ((unsigned char *)urb->transfer_buffer)[i++];
1486
1487 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1488 opcode, line, status, val);
1489
1490 if (status != 0 || line >= serial->type->num_ports)
1491 continue;
1492
1493 port = serial->port[line];
1494
1495 priv = usb_get_serial_port_data(port);
1496 if (priv == NULL)
1497 return -1;
1498
1499 tty = tty_port_tty_get(&port->port);
1500
1501 rts = 0;
1502 if (tty)
1503 rts = tty->termios.c_cflag & CRTSCTS;
1504
1505 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1506 spin_lock(&priv->dp_port_lock);
1507 /* convert from digi flags to termiox flags */
1508 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1509 priv->dp_modem_signals |= TIOCM_CTS;
1510 /* port must be open to use tty struct */
1511 if (rts) {
1512 tty->hw_stopped = 0;
1513 digi_wakeup_write(port);
1514 }
1515 } else {
1516 priv->dp_modem_signals &= ~TIOCM_CTS;
1517 /* port must be open to use tty struct */
1518 if (rts)
1519 tty->hw_stopped = 1;
1520 }
1521 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1522 priv->dp_modem_signals |= TIOCM_DSR;
1523 else
1524 priv->dp_modem_signals &= ~TIOCM_DSR;
1525 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1526 priv->dp_modem_signals |= TIOCM_RI;
1527 else
1528 priv->dp_modem_signals &= ~TIOCM_RI;
1529 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1530 priv->dp_modem_signals |= TIOCM_CD;
1531 else
1532 priv->dp_modem_signals &= ~TIOCM_CD;
1533
1534 wake_up_interruptible(&priv->dp_modem_change_wait);
1535 spin_unlock(&priv->dp_port_lock);
1536 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1537 spin_lock(&priv->dp_port_lock);
1538 priv->dp_transmit_idle = 1;
1539 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1540 spin_unlock(&priv->dp_port_lock);
1541 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1542 wake_up_interruptible(&priv->dp_flush_wait);
1543 }
1544 tty_kref_put(tty);
1545 }
1546 return 0;
1547
1548 }
1549
1550 module_usb_serial_driver(serial_drivers, id_table_combined);
1551
1552 MODULE_AUTHOR(DRIVER_AUTHOR);
1553 MODULE_DESCRIPTION(DRIVER_DESC);
1554 MODULE_LICENSE("GPL");
1555
1556 module_param(debug, bool, S_IRUGO | S_IWUSR);
1557 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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