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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / usb / serial / digi_acceleport.c
blobb23bebd721a1f8e511a386b7667827afc8ebaa3e
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 static struct usb_driver digi_driver = {
275 .name = "digi_acceleport",
276 .probe = usb_serial_probe,
277 .disconnect = usb_serial_disconnect,
278 .id_table = id_table_combined,
279 .no_dynamic_id = 1,
280 };
281
282
283 /* device info needed for the Digi serial converter */
284
285 static struct usb_serial_driver digi_acceleport_2_device = {
286 .driver = {
287 .owner = THIS_MODULE,
288 .name = "digi_2",
289 },
290 .description = "Digi 2 port USB adapter",
291 .usb_driver = &digi_driver,
292 .id_table = id_table_2,
293 .num_ports = 3,
294 .open = digi_open,
295 .close = digi_close,
296 .dtr_rts = digi_dtr_rts,
297 .write = digi_write,
298 .write_room = digi_write_room,
299 .write_bulk_callback = digi_write_bulk_callback,
300 .read_bulk_callback = digi_read_bulk_callback,
301 .chars_in_buffer = digi_chars_in_buffer,
302 .throttle = digi_rx_throttle,
303 .unthrottle = digi_rx_unthrottle,
304 .set_termios = digi_set_termios,
305 .break_ctl = digi_break_ctl,
306 .tiocmget = digi_tiocmget,
307 .tiocmset = digi_tiocmset,
308 .attach = digi_startup,
309 .disconnect = digi_disconnect,
310 .release = digi_release,
311 };
312
313 static struct usb_serial_driver digi_acceleport_4_device = {
314 .driver = {
315 .owner = THIS_MODULE,
316 .name = "digi_4",
317 },
318 .description = "Digi 4 port USB adapter",
319 .usb_driver = &digi_driver,
320 .id_table = id_table_4,
321 .num_ports = 4,
322 .open = digi_open,
323 .close = digi_close,
324 .write = digi_write,
325 .write_room = digi_write_room,
326 .write_bulk_callback = digi_write_bulk_callback,
327 .read_bulk_callback = digi_read_bulk_callback,
328 .chars_in_buffer = digi_chars_in_buffer,
329 .throttle = digi_rx_throttle,
330 .unthrottle = digi_rx_unthrottle,
331 .set_termios = digi_set_termios,
332 .break_ctl = digi_break_ctl,
333 .tiocmget = digi_tiocmget,
334 .tiocmset = digi_tiocmset,
335 .attach = digi_startup,
336 .disconnect = digi_disconnect,
337 .release = digi_release,
338 };
339
340
341 /* Functions */
342
343 /*
344 * Cond Wait Interruptible Timeout Irqrestore
345 *
346 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
347 * so that wake ups are not lost if they occur between the unlock
348 * and the sleep. In other words, spin_unlock_irqrestore and
349 * interruptible_sleep_on_timeout are "atomic" with respect to
350 * wake ups. This is used to implement condition variables.
351 *
352 * interruptible_sleep_on_timeout is deprecated and has been replaced
353 * with the equivalent code.
354 */
355
356 static long cond_wait_interruptible_timeout_irqrestore(
357 wait_queue_head_t *q, long timeout,
358 spinlock_t *lock, unsigned long flags)
359 __releases(lock)
360 {
361 DEFINE_WAIT(wait);
362
363 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
364 spin_unlock_irqrestore(lock, flags);
365 timeout = schedule_timeout(timeout);
366 finish_wait(q, &wait);
367
368 return timeout;
369 }
370
371
372 /*
373 * Digi Wakeup Write
374 *
375 * Wake up port, line discipline, and tty processes sleeping
376 * on writes.
377 */
378
379 static void digi_wakeup_write_lock(struct work_struct *work)
380 {
381 struct digi_port *priv =
382 container_of(work, struct digi_port, dp_wakeup_work);
383 struct usb_serial_port *port = priv->dp_port;
384 unsigned long flags;
385
386 spin_lock_irqsave(&priv->dp_port_lock, flags);
387 digi_wakeup_write(port);
388 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
389 }
390
391 static void digi_wakeup_write(struct usb_serial_port *port)
392 {
393 struct tty_struct *tty = tty_port_tty_get(&port->port);
394 if (tty) {
395 tty_wakeup(tty);
396 tty_kref_put(tty);
397 }
398 }
399
400
401 /*
402 * Digi Write OOB Command
403 *
404 * Write commands on the out of band port. Commands are 4
405 * bytes each, multiple commands can be sent at once, and
406 * no command will be split across USB packets. Returns 0
407 * if successful, -EINTR if interrupted while sleeping and
408 * the interruptible flag is true, or a negative error
409 * returned by usb_submit_urb.
410 */
411
412 static int digi_write_oob_command(struct usb_serial_port *port,
413 unsigned char *buf, int count, int interruptible)
414 {
415
416 int ret = 0;
417 int len;
418 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
419 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
420 unsigned long flags = 0;
421
422 dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
423
424 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
425 while (count > 0) {
426 while (oob_priv->dp_write_urb_in_use) {
427 cond_wait_interruptible_timeout_irqrestore(
428 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
429 &oob_priv->dp_port_lock, flags);
430 if (interruptible && signal_pending(current))
431 return -EINTR;
432 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
433 }
434
435 /* len must be a multiple of 4, so commands are not split */
436 len = min(count, oob_port->bulk_out_size);
437 if (len > 4)
438 len &= ~3;
439 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
440 oob_port->write_urb->transfer_buffer_length = len;
441 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
442 if (ret == 0) {
443 oob_priv->dp_write_urb_in_use = 1;
444 count -= len;
445 buf += len;
446 }
447 }
448 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
449 if (ret)
450 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
451 __func__, ret);
452 return ret;
453
454 }
455
456
457 /*
458 * Digi Write In Band Command
459 *
460 * Write commands on the given port. Commands are 4
461 * bytes each, multiple commands can be sent at once, and
462 * no command will be split across USB packets. If timeout
463 * is non-zero, write in band command will return after
464 * waiting unsuccessfully for the URB status to clear for
465 * timeout ticks. Returns 0 if successful, or a negative
466 * error returned by digi_write.
467 */
468
469 static int digi_write_inb_command(struct usb_serial_port *port,
470 unsigned char *buf, int count, unsigned long timeout)
471 {
472 int ret = 0;
473 int len;
474 struct digi_port *priv = usb_get_serial_port_data(port);
475 unsigned char *data = port->write_urb->transfer_buffer;
476 unsigned long flags = 0;
477
478 dbg("digi_write_inb_command: TOP: port=%d, count=%d",
479 priv->dp_port_num, count);
480
481 if (timeout)
482 timeout += jiffies;
483 else
484 timeout = ULONG_MAX;
485
486 spin_lock_irqsave(&priv->dp_port_lock, flags);
487 while (count > 0 && ret == 0) {
488 while (priv->dp_write_urb_in_use &&
489 time_before(jiffies, timeout)) {
490 cond_wait_interruptible_timeout_irqrestore(
491 &port->write_wait, DIGI_RETRY_TIMEOUT,
492 &priv->dp_port_lock, flags);
493 if (signal_pending(current))
494 return -EINTR;
495 spin_lock_irqsave(&priv->dp_port_lock, flags);
496 }
497
498 /* len must be a multiple of 4 and small enough to */
499 /* guarantee the write will send buffered data first, */
500 /* so commands are in order with data and not split */
501 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
502 if (len > 4)
503 len &= ~3;
504
505 /* write any buffered data first */
506 if (priv->dp_out_buf_len > 0) {
507 data[0] = DIGI_CMD_SEND_DATA;
508 data[1] = priv->dp_out_buf_len;
509 memcpy(data + 2, priv->dp_out_buf,
510 priv->dp_out_buf_len);
511 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
512 port->write_urb->transfer_buffer_length
513 = priv->dp_out_buf_len + 2 + len;
514 } else {
515 memcpy(data, buf, len);
516 port->write_urb->transfer_buffer_length = len;
517 }
518
519 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
520 if (ret == 0) {
521 priv->dp_write_urb_in_use = 1;
522 priv->dp_out_buf_len = 0;
523 count -= len;
524 buf += len;
525 }
526
527 }
528 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
529
530 if (ret)
531 dev_err(&port->dev,
532 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
533 __func__, ret, priv->dp_port_num);
534 return ret;
535 }
536
537
538 /*
539 * Digi Set Modem Signals
540 *
541 * Sets or clears DTR and RTS on the port, according to the
542 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
543 * for the modem_signals argument. Returns 0 if successful,
544 * -EINTR if interrupted while sleeping, or a non-zero error
545 * returned by usb_submit_urb.
546 */
547
548 static int digi_set_modem_signals(struct usb_serial_port *port,
549 unsigned int modem_signals, int interruptible)
550 {
551
552 int ret;
553 struct digi_port *port_priv = usb_get_serial_port_data(port);
554 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
555 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
556 unsigned char *data = oob_port->write_urb->transfer_buffer;
557 unsigned long flags = 0;
558
559
560 dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
561 port_priv->dp_port_num, modem_signals);
562
563 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
564 spin_lock(&port_priv->dp_port_lock);
565
566 while (oob_priv->dp_write_urb_in_use) {
567 spin_unlock(&port_priv->dp_port_lock);
568 cond_wait_interruptible_timeout_irqrestore(
569 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
570 &oob_priv->dp_port_lock, flags);
571 if (interruptible && signal_pending(current))
572 return -EINTR;
573 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
574 spin_lock(&port_priv->dp_port_lock);
575 }
576 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
577 data[1] = port_priv->dp_port_num;
578 data[2] = (modem_signals & TIOCM_DTR) ?
579 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
580 data[3] = 0;
581 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
582 data[5] = port_priv->dp_port_num;
583 data[6] = (modem_signals & TIOCM_RTS) ?
584 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
585 data[7] = 0;
586
587 oob_port->write_urb->transfer_buffer_length = 8;
588
589 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
590 if (ret == 0) {
591 oob_priv->dp_write_urb_in_use = 1;
592 port_priv->dp_modem_signals =
593 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
594 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
595 }
596 spin_unlock(&port_priv->dp_port_lock);
597 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
598 if (ret)
599 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
600 __func__, ret);
601 return ret;
602 }
603
604 /*
605 * Digi Transmit Idle
606 *
607 * Digi transmit idle waits, up to timeout ticks, for the transmitter
608 * to go idle. It returns 0 if successful or a negative error.
609 *
610 * There are race conditions here if more than one process is calling
611 * digi_transmit_idle on the same port at the same time. However, this
612 * is only called from close, and only one process can be in close on a
613 * port at a time, so its ok.
614 */
615
616 static int digi_transmit_idle(struct usb_serial_port *port,
617 unsigned long timeout)
618 {
619 int ret;
620 unsigned char buf[2];
621 struct digi_port *priv = usb_get_serial_port_data(port);
622 unsigned long flags = 0;
623
624 spin_lock_irqsave(&priv->dp_port_lock, flags);
625 priv->dp_transmit_idle = 0;
626 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
627
628 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
629 buf[1] = 0;
630
631 timeout += jiffies;
632
633 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
634 if (ret != 0)
635 return ret;
636
637 spin_lock_irqsave(&priv->dp_port_lock, flags);
638
639 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
640 cond_wait_interruptible_timeout_irqrestore(
641 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
642 &priv->dp_port_lock, flags);
643 if (signal_pending(current))
644 return -EINTR;
645 spin_lock_irqsave(&priv->dp_port_lock, flags);
646 }
647 priv->dp_transmit_idle = 0;
648 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
649 return 0;
650
651 }
652
653
654 static void digi_rx_throttle(struct tty_struct *tty)
655 {
656 unsigned long flags;
657 struct usb_serial_port *port = tty->driver_data;
658 struct digi_port *priv = usb_get_serial_port_data(port);
659
660
661 dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num);
662
663 /* stop receiving characters by not resubmitting the read urb */
664 spin_lock_irqsave(&priv->dp_port_lock, flags);
665 priv->dp_throttled = 1;
666 priv->dp_throttle_restart = 0;
667 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
668 }
669
670
671 static void digi_rx_unthrottle(struct tty_struct *tty)
672 {
673 int ret = 0;
674 unsigned long flags;
675 struct usb_serial_port *port = tty->driver_data;
676 struct digi_port *priv = usb_get_serial_port_data(port);
677
678 dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num);
679
680 spin_lock_irqsave(&priv->dp_port_lock, flags);
681
682 /* restart read chain */
683 if (priv->dp_throttle_restart)
684 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
685
686 /* turn throttle off */
687 priv->dp_throttled = 0;
688 priv->dp_throttle_restart = 0;
689
690 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
691
692 if (ret)
693 dev_err(&port->dev,
694 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
695 __func__, ret, priv->dp_port_num);
696 }
697
698
699 static void digi_set_termios(struct tty_struct *tty,
700 struct usb_serial_port *port, struct ktermios *old_termios)
701 {
702 struct digi_port *priv = usb_get_serial_port_data(port);
703 unsigned int iflag = tty->termios->c_iflag;
704 unsigned int cflag = tty->termios->c_cflag;
705 unsigned int old_iflag = old_termios->c_iflag;
706 unsigned int old_cflag = old_termios->c_cflag;
707 unsigned char buf[32];
708 unsigned int modem_signals;
709 int arg, ret;
710 int i = 0;
711 speed_t baud;
712
713 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);
714
715 /* set baud rate */
716 baud = tty_get_baud_rate(tty);
717 if (baud != tty_termios_baud_rate(old_termios)) {
718 arg = -1;
719
720 /* reassert DTR and (maybe) RTS on transition from B0 */
721 if ((old_cflag&CBAUD) == B0) {
722 /* don't set RTS if using hardware flow control */
723 /* and throttling input */
724 modem_signals = TIOCM_DTR;
725 if (!(tty->termios->c_cflag & CRTSCTS) ||
726 !test_bit(TTY_THROTTLED, &tty->flags))
727 modem_signals |= TIOCM_RTS;
728 digi_set_modem_signals(port, modem_signals, 1);
729 }
730 switch (baud) {
731 /* drop DTR and RTS on transition to B0 */
732 case 0: digi_set_modem_signals(port, 0, 1); break;
733 case 50: arg = DIGI_BAUD_50; break;
734 case 75: arg = DIGI_BAUD_75; break;
735 case 110: arg = DIGI_BAUD_110; break;
736 case 150: arg = DIGI_BAUD_150; break;
737 case 200: arg = DIGI_BAUD_200; break;
738 case 300: arg = DIGI_BAUD_300; break;
739 case 600: arg = DIGI_BAUD_600; break;
740 case 1200: arg = DIGI_BAUD_1200; break;
741 case 1800: arg = DIGI_BAUD_1800; break;
742 case 2400: arg = DIGI_BAUD_2400; break;
743 case 4800: arg = DIGI_BAUD_4800; break;
744 case 9600: arg = DIGI_BAUD_9600; break;
745 case 19200: arg = DIGI_BAUD_19200; break;
746 case 38400: arg = DIGI_BAUD_38400; break;
747 case 57600: arg = DIGI_BAUD_57600; break;
748 case 115200: arg = DIGI_BAUD_115200; break;
749 case 230400: arg = DIGI_BAUD_230400; break;
750 case 460800: arg = DIGI_BAUD_460800; break;
751 default:
752 arg = DIGI_BAUD_9600;
753 baud = 9600;
754 break;
755 }
756 if (arg != -1) {
757 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
758 buf[i++] = priv->dp_port_num;
759 buf[i++] = arg;
760 buf[i++] = 0;
761 }
762 }
763 /* set parity */
764 tty->termios->c_cflag &= ~CMSPAR;
765
766 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
767 if (cflag&PARENB) {
768 if (cflag&PARODD)
769 arg = DIGI_PARITY_ODD;
770 else
771 arg = DIGI_PARITY_EVEN;
772 } else {
773 arg = DIGI_PARITY_NONE;
774 }
775 buf[i++] = DIGI_CMD_SET_PARITY;
776 buf[i++] = priv->dp_port_num;
777 buf[i++] = arg;
778 buf[i++] = 0;
779 }
780 /* set word size */
781 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
782 arg = -1;
783 switch (cflag&CSIZE) {
784 case CS5: arg = DIGI_WORD_SIZE_5; break;
785 case CS6: arg = DIGI_WORD_SIZE_6; break;
786 case CS7: arg = DIGI_WORD_SIZE_7; break;
787 case CS8: arg = DIGI_WORD_SIZE_8; break;
788 default:
789 dbg("digi_set_termios: can't handle word size %d",
790 (cflag&CSIZE));
791 break;
792 }
793
794 if (arg != -1) {
795 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
796 buf[i++] = priv->dp_port_num;
797 buf[i++] = arg;
798 buf[i++] = 0;
799 }
800
801 }
802
803 /* set stop bits */
804 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
805
806 if ((cflag&CSTOPB))
807 arg = DIGI_STOP_BITS_2;
808 else
809 arg = DIGI_STOP_BITS_1;
810
811 buf[i++] = DIGI_CMD_SET_STOP_BITS;
812 buf[i++] = priv->dp_port_num;
813 buf[i++] = arg;
814 buf[i++] = 0;
815
816 }
817
818 /* set input flow control */
819 if ((iflag&IXOFF) != (old_iflag&IXOFF)
820 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
821 arg = 0;
822 if (iflag&IXOFF)
823 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
824 else
825 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
826
827 if (cflag&CRTSCTS) {
828 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
829
830 /* On USB-4 it is necessary to assert RTS prior */
831 /* to selecting RTS input flow control. */
832 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
833 buf[i++] = priv->dp_port_num;
834 buf[i++] = DIGI_RTS_ACTIVE;
835 buf[i++] = 0;
836
837 } else {
838 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
839 }
840 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
841 buf[i++] = priv->dp_port_num;
842 buf[i++] = arg;
843 buf[i++] = 0;
844 }
845
846 /* set output flow control */
847 if ((iflag & IXON) != (old_iflag & IXON)
848 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
849 arg = 0;
850 if (iflag & IXON)
851 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
852 else
853 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
854
855 if (cflag & CRTSCTS) {
856 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
857 } else {
858 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
859 tty->hw_stopped = 0;
860 }
861
862 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
863 buf[i++] = priv->dp_port_num;
864 buf[i++] = arg;
865 buf[i++] = 0;
866 }
867
868 /* set receive enable/disable */
869 if ((cflag & CREAD) != (old_cflag & CREAD)) {
870 if (cflag & CREAD)
871 arg = DIGI_ENABLE;
872 else
873 arg = DIGI_DISABLE;
874
875 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
876 buf[i++] = priv->dp_port_num;
877 buf[i++] = arg;
878 buf[i++] = 0;
879 }
880 ret = digi_write_oob_command(port, buf, i, 1);
881 if (ret != 0)
882 dbg("digi_set_termios: write oob failed, ret=%d", ret);
883 tty_encode_baud_rate(tty, baud, baud);
884 }
885
886
887 static void digi_break_ctl(struct tty_struct *tty, int break_state)
888 {
889 struct usb_serial_port *port = tty->driver_data;
890 unsigned char buf[4];
891
892 buf[0] = DIGI_CMD_BREAK_CONTROL;
893 buf[1] = 2; /* length */
894 buf[2] = break_state ? 1 : 0;
895 buf[3] = 0; /* pad */
896 digi_write_inb_command(port, buf, 4, 0);
897 }
898
899
900 static int digi_tiocmget(struct tty_struct *tty)
901 {
902 struct usb_serial_port *port = tty->driver_data;
903 struct digi_port *priv = usb_get_serial_port_data(port);
904 unsigned int val;
905 unsigned long flags;
906
907 dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
908
909 spin_lock_irqsave(&priv->dp_port_lock, flags);
910 val = priv->dp_modem_signals;
911 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
912 return val;
913 }
914
915
916 static int digi_tiocmset(struct tty_struct *tty,
917 unsigned int set, unsigned int clear)
918 {
919 struct usb_serial_port *port = tty->driver_data;
920 struct digi_port *priv = usb_get_serial_port_data(port);
921 unsigned int val;
922 unsigned long flags;
923
924 dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
925
926 spin_lock_irqsave(&priv->dp_port_lock, flags);
927 val = (priv->dp_modem_signals & ~clear) | set;
928 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
929 return digi_set_modem_signals(port, val, 1);
930 }
931
932
933 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
934 const unsigned char *buf, int count)
935 {
936
937 int ret, data_len, new_len;
938 struct digi_port *priv = usb_get_serial_port_data(port);
939 unsigned char *data = port->write_urb->transfer_buffer;
940 unsigned long flags = 0;
941
942 dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
943 priv->dp_port_num, count, in_interrupt());
944
945 /* copy user data (which can sleep) before getting spin lock */
946 count = min(count, port->bulk_out_size-2);
947 count = min(64, count);
948
949 /* be sure only one write proceeds at a time */
950 /* there are races on the port private buffer */
951 spin_lock_irqsave(&priv->dp_port_lock, flags);
952
953 /* wait for urb status clear to submit another urb */
954 if (priv->dp_write_urb_in_use) {
955 /* buffer data if count is 1 (probably put_char) if possible */
956 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
957 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
958 new_len = 1;
959 } else {
960 new_len = 0;
961 }
962 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
963 return new_len;
964 }
965
966 /* allow space for any buffered data and for new data, up to */
967 /* transfer buffer size - 2 (for command and length bytes) */
968 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
969 data_len = new_len + priv->dp_out_buf_len;
970
971 if (data_len == 0) {
972 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
973 return 0;
974 }
975
976 port->write_urb->transfer_buffer_length = data_len+2;
977
978 *data++ = DIGI_CMD_SEND_DATA;
979 *data++ = data_len;
980
981 /* copy in buffered data first */
982 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
983 data += priv->dp_out_buf_len;
984
985 /* copy in new data */
986 memcpy(data, buf, new_len);
987
988 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
989 if (ret == 0) {
990 priv->dp_write_urb_in_use = 1;
991 ret = new_len;
992 priv->dp_out_buf_len = 0;
993 }
994
995 /* return length of new data written, or error */
996 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
997 if (ret < 0)
998 dev_err(&port->dev,
999 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1000 __func__, ret, priv->dp_port_num);
1001 dbg("digi_write: returning %d", ret);
1002 return ret;
1003
1004 }
1005
1006 static void digi_write_bulk_callback(struct urb *urb)
1007 {
1008
1009 struct usb_serial_port *port = urb->context;
1010 struct usb_serial *serial;
1011 struct digi_port *priv;
1012 struct digi_serial *serial_priv;
1013 int ret = 0;
1014 int status = urb->status;
1015
1016 dbg("digi_write_bulk_callback: TOP, status=%d", status);
1017
1018 /* port and serial sanity check */
1019 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1020 pr_err("%s: port or port->private is NULL, status=%d\n",
1021 __func__, status);
1022 return;
1023 }
1024 serial = port->serial;
1025 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
1026 dev_err(&port->dev,
1027 "%s: serial or serial->private is NULL, status=%d\n",
1028 __func__, status);
1029 return;
1030 }
1031
1032 /* handle oob callback */
1033 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1034 dbg("digi_write_bulk_callback: oob callback");
1035 spin_lock(&priv->dp_port_lock);
1036 priv->dp_write_urb_in_use = 0;
1037 wake_up_interruptible(&port->write_wait);
1038 spin_unlock(&priv->dp_port_lock);
1039 return;
1040 }
1041
1042 /* try to send any buffered data on this port */
1043 spin_lock(&priv->dp_port_lock);
1044 priv->dp_write_urb_in_use = 0;
1045 if (priv->dp_out_buf_len > 0) {
1046 *((unsigned char *)(port->write_urb->transfer_buffer))
1047 = (unsigned char)DIGI_CMD_SEND_DATA;
1048 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1049 = (unsigned char)priv->dp_out_buf_len;
1050 port->write_urb->transfer_buffer_length =
1051 priv->dp_out_buf_len + 2;
1052 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1053 priv->dp_out_buf_len);
1054 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1055 if (ret == 0) {
1056 priv->dp_write_urb_in_use = 1;
1057 priv->dp_out_buf_len = 0;
1058 }
1059 }
1060 /* wake up processes sleeping on writes immediately */
1061 digi_wakeup_write(port);
1062 /* also queue up a wakeup at scheduler time, in case we */
1063 /* lost the race in write_chan(). */
1064 schedule_work(&priv->dp_wakeup_work);
1065
1066 spin_unlock(&priv->dp_port_lock);
1067 if (ret && ret != -EPERM)
1068 dev_err(&port->dev,
1069 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1070 __func__, ret, priv->dp_port_num);
1071 }
1072
1073 static int digi_write_room(struct tty_struct *tty)
1074 {
1075 struct usb_serial_port *port = tty->driver_data;
1076 struct digi_port *priv = usb_get_serial_port_data(port);
1077 int room;
1078 unsigned long flags = 0;
1079
1080 spin_lock_irqsave(&priv->dp_port_lock, flags);
1081
1082 if (priv->dp_write_urb_in_use)
1083 room = 0;
1084 else
1085 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1086
1087 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1088 dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
1089 return room;
1090
1091 }
1092
1093 static int digi_chars_in_buffer(struct tty_struct *tty)
1094 {
1095 struct usb_serial_port *port = tty->driver_data;
1096 struct digi_port *priv = usb_get_serial_port_data(port);
1097
1098 if (priv->dp_write_urb_in_use) {
1099 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1100 priv->dp_port_num, port->bulk_out_size - 2);
1101 /* return(port->bulk_out_size - 2); */
1102 return 256;
1103 } else {
1104 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1105 priv->dp_port_num, priv->dp_out_buf_len);
1106 return priv->dp_out_buf_len;
1107 }
1108
1109 }
1110
1111 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1112 {
1113 /* Adjust DTR and RTS */
1114 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1115 }
1116
1117 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1118 {
1119 int ret;
1120 unsigned char buf[32];
1121 struct digi_port *priv = usb_get_serial_port_data(port);
1122 struct ktermios not_termios;
1123
1124 dbg("digi_open: TOP: port=%d", priv->dp_port_num);
1125
1126 /* be sure the device is started up */
1127 if (digi_startup_device(port->serial) != 0)
1128 return -ENXIO;
1129
1130 /* read modem signals automatically whenever they change */
1131 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1132 buf[1] = priv->dp_port_num;
1133 buf[2] = DIGI_ENABLE;
1134 buf[3] = 0;
1135
1136 /* flush fifos */
1137 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1138 buf[5] = priv->dp_port_num;
1139 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1140 buf[7] = 0;
1141
1142 ret = digi_write_oob_command(port, buf, 8, 1);
1143 if (ret != 0)
1144 dbg("digi_open: write oob failed, ret=%d", ret);
1145
1146 /* set termios settings */
1147 if (tty) {
1148 not_termios.c_cflag = ~tty->termios->c_cflag;
1149 not_termios.c_iflag = ~tty->termios->c_iflag;
1150 digi_set_termios(tty, port, &not_termios);
1151 }
1152 return 0;
1153 }
1154
1155
1156 static void digi_close(struct usb_serial_port *port)
1157 {
1158 DEFINE_WAIT(wait);
1159 int ret;
1160 unsigned char buf[32];
1161 struct digi_port *priv = usb_get_serial_port_data(port);
1162
1163 dbg("digi_close: TOP: port=%d", priv->dp_port_num);
1164
1165 mutex_lock(&port->serial->disc_mutex);
1166 /* if disconnected, just clear flags */
1167 if (port->serial->disconnected)
1168 goto exit;
1169
1170 if (port->serial->dev) {
1171 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1172 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1173
1174 /* disable input flow control */
1175 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1176 buf[1] = priv->dp_port_num;
1177 buf[2] = DIGI_DISABLE;
1178 buf[3] = 0;
1179
1180 /* disable output flow control */
1181 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1182 buf[5] = priv->dp_port_num;
1183 buf[6] = DIGI_DISABLE;
1184 buf[7] = 0;
1185
1186 /* disable reading modem signals automatically */
1187 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1188 buf[9] = priv->dp_port_num;
1189 buf[10] = DIGI_DISABLE;
1190 buf[11] = 0;
1191
1192 /* disable receive */
1193 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1194 buf[13] = priv->dp_port_num;
1195 buf[14] = DIGI_DISABLE;
1196 buf[15] = 0;
1197
1198 /* flush fifos */
1199 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1200 buf[17] = priv->dp_port_num;
1201 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1202 buf[19] = 0;
1203
1204 ret = digi_write_oob_command(port, buf, 20, 0);
1205 if (ret != 0)
1206 dbg("digi_close: write oob failed, ret=%d", ret);
1207
1208 /* wait for final commands on oob port to complete */
1209 prepare_to_wait(&priv->dp_flush_wait, &wait,
1210 TASK_INTERRUPTIBLE);
1211 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1212 finish_wait(&priv->dp_flush_wait, &wait);
1213
1214 /* shutdown any outstanding bulk writes */
1215 usb_kill_urb(port->write_urb);
1216 }
1217 exit:
1218 spin_lock_irq(&priv->dp_port_lock);
1219 priv->dp_write_urb_in_use = 0;
1220 wake_up_interruptible(&priv->dp_close_wait);
1221 spin_unlock_irq(&priv->dp_port_lock);
1222 mutex_unlock(&port->serial->disc_mutex);
1223 dbg("digi_close: done");
1224 }
1225
1226
1227 /*
1228 * Digi Startup Device
1229 *
1230 * Starts reads on all ports. Must be called AFTER startup, with
1231 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1232 */
1233
1234 static int digi_startup_device(struct usb_serial *serial)
1235 {
1236 int i, ret = 0;
1237 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1238 struct usb_serial_port *port;
1239
1240 /* be sure this happens exactly once */
1241 spin_lock(&serial_priv->ds_serial_lock);
1242 if (serial_priv->ds_device_started) {
1243 spin_unlock(&serial_priv->ds_serial_lock);
1244 return 0;
1245 }
1246 serial_priv->ds_device_started = 1;
1247 spin_unlock(&serial_priv->ds_serial_lock);
1248
1249 /* start reading from each bulk in endpoint for the device */
1250 /* set USB_DISABLE_SPD flag for write bulk urbs */
1251 for (i = 0; i < serial->type->num_ports + 1; i++) {
1252 port = serial->port[i];
1253 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1254 if (ret != 0) {
1255 dev_err(&port->dev,
1256 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1257 __func__, ret, i);
1258 break;
1259 }
1260 }
1261 return ret;
1262 }
1263
1264
1265 static int digi_startup(struct usb_serial *serial)
1266 {
1267
1268 int i;
1269 struct digi_port *priv;
1270 struct digi_serial *serial_priv;
1271
1272 dbg("digi_startup: TOP");
1273
1274 /* allocate the private data structures for all ports */
1275 /* number of regular ports + 1 for the out-of-band port */
1276 for (i = 0; i < serial->type->num_ports + 1; i++) {
1277 /* allocate port private structure */
1278 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1279 if (priv == NULL) {
1280 while (--i >= 0)
1281 kfree(usb_get_serial_port_data(serial->port[i]));
1282 return 1; /* error */
1283 }
1284
1285 /* initialize port private structure */
1286 spin_lock_init(&priv->dp_port_lock);
1287 priv->dp_port_num = i;
1288 priv->dp_out_buf_len = 0;
1289 priv->dp_write_urb_in_use = 0;
1290 priv->dp_modem_signals = 0;
1291 init_waitqueue_head(&priv->dp_modem_change_wait);
1292 priv->dp_transmit_idle = 0;
1293 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1294 priv->dp_throttled = 0;
1295 priv->dp_throttle_restart = 0;
1296 init_waitqueue_head(&priv->dp_flush_wait);
1297 init_waitqueue_head(&priv->dp_close_wait);
1298 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1299 priv->dp_port = serial->port[i];
1300 /* initialize write wait queue for this port */
1301 init_waitqueue_head(&serial->port[i]->write_wait);
1302
1303 usb_set_serial_port_data(serial->port[i], priv);
1304 }
1305
1306 /* allocate serial private structure */
1307 serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1308 if (serial_priv == NULL) {
1309 for (i = 0; i < serial->type->num_ports + 1; i++)
1310 kfree(usb_get_serial_port_data(serial->port[i]));
1311 return 1; /* error */
1312 }
1313
1314 /* initialize serial private structure */
1315 spin_lock_init(&serial_priv->ds_serial_lock);
1316 serial_priv->ds_oob_port_num = serial->type->num_ports;
1317 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1318 serial_priv->ds_device_started = 0;
1319 usb_set_serial_data(serial, serial_priv);
1320
1321 return 0;
1322 }
1323
1324
1325 static void digi_disconnect(struct usb_serial *serial)
1326 {
1327 int i;
1328 dbg("digi_disconnect: TOP, in_interrupt()=%ld", in_interrupt());
1329
1330 /* stop reads and writes on all ports */
1331 for (i = 0; i < serial->type->num_ports + 1; i++) {
1332 usb_kill_urb(serial->port[i]->read_urb);
1333 usb_kill_urb(serial->port[i]->write_urb);
1334 }
1335 }
1336
1337
1338 static void digi_release(struct usb_serial *serial)
1339 {
1340 int i;
1341 dbg("digi_release: TOP, in_interrupt()=%ld", in_interrupt());
1342
1343 /* free the private data structures for all ports */
1344 /* number of regular ports + 1 for the out-of-band port */
1345 for (i = 0; i < serial->type->num_ports + 1; i++)
1346 kfree(usb_get_serial_port_data(serial->port[i]));
1347 kfree(usb_get_serial_data(serial));
1348 }
1349
1350
1351 static void digi_read_bulk_callback(struct urb *urb)
1352 {
1353 struct usb_serial_port *port = urb->context;
1354 struct digi_port *priv;
1355 struct digi_serial *serial_priv;
1356 int ret;
1357 int status = urb->status;
1358
1359 dbg("digi_read_bulk_callback: TOP");
1360
1361 /* port sanity check, do not resubmit if port is not valid */
1362 if (port == NULL)
1363 return;
1364 priv = usb_get_serial_port_data(port);
1365 if (priv == NULL) {
1366 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1367 __func__, status);
1368 return;
1369 }
1370 if (port->serial == NULL ||
1371 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1372 dev_err(&port->dev, "%s: serial is bad or serial->private "
1373 "is NULL, status=%d\n", __func__, status);
1374 return;
1375 }
1376
1377 /* do not resubmit urb if it has any status error */
1378 if (status) {
1379 dev_err(&port->dev,
1380 "%s: nonzero read bulk status: status=%d, port=%d\n",
1381 __func__, status, priv->dp_port_num);
1382 return;
1383 }
1384
1385 /* handle oob or inb callback, do not resubmit if error */
1386 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1387 if (digi_read_oob_callback(urb) != 0)
1388 return;
1389 } else {
1390 if (digi_read_inb_callback(urb) != 0)
1391 return;
1392 }
1393
1394 /* continue read */
1395 ret = usb_submit_urb(urb, GFP_ATOMIC);
1396 if (ret != 0 && ret != -EPERM) {
1397 dev_err(&port->dev,
1398 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1399 __func__, ret, priv->dp_port_num);
1400 }
1401
1402 }
1403
1404 /*
1405 * Digi Read INB Callback
1406 *
1407 * Digi Read INB Callback handles reads on the in band ports, sending
1408 * the data on to the tty subsystem. When called we know port and
1409 * port->private are not NULL and port->serial has been validated.
1410 * It returns 0 if successful, 1 if successful but the port is
1411 * throttled, and -1 if the sanity checks failed.
1412 */
1413
1414 static int digi_read_inb_callback(struct urb *urb)
1415 {
1416
1417 struct usb_serial_port *port = urb->context;
1418 struct tty_struct *tty;
1419 struct digi_port *priv = usb_get_serial_port_data(port);
1420 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1421 int len = ((unsigned char *)urb->transfer_buffer)[1];
1422 int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1423 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1424 int flag, throttled;
1425 int status = urb->status;
1426
1427 /* do not process callbacks on closed ports */
1428 /* but do continue the read chain */
1429 if (urb->status == -ENOENT)
1430 return 0;
1431
1432 /* short/multiple packet check */
1433 if (urb->actual_length != len + 2) {
1434 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1435 "status=%d, port=%d, opcode=%d, len=%d, "
1436 "actual_length=%d, status=%d\n", __func__, status,
1437 priv->dp_port_num, opcode, len, urb->actual_length,
1438 port_status);
1439 return -1;
1440 }
1441
1442 tty = tty_port_tty_get(&port->port);
1443 spin_lock(&priv->dp_port_lock);
1444
1445 /* check for throttle; if set, do not resubmit read urb */
1446 /* indicate the read chain needs to be restarted on unthrottle */
1447 throttled = priv->dp_throttled;
1448 if (throttled)
1449 priv->dp_throttle_restart = 1;
1450
1451 /* receive data */
1452 if (tty && opcode == DIGI_CMD_RECEIVE_DATA) {
1453 /* get flag from port_status */
1454 flag = 0;
1455
1456 /* overrun is special, not associated with a char */
1457 if (port_status & DIGI_OVERRUN_ERROR)
1458 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1459
1460 /* break takes precedence over parity, */
1461 /* which takes precedence over framing errors */
1462 if (port_status & DIGI_BREAK_ERROR)
1463 flag = TTY_BREAK;
1464 else if (port_status & DIGI_PARITY_ERROR)
1465 flag = TTY_PARITY;
1466 else if (port_status & DIGI_FRAMING_ERROR)
1467 flag = TTY_FRAME;
1468
1469 /* data length is len-1 (one byte of len is port_status) */
1470 --len;
1471 if (len > 0) {
1472 tty_insert_flip_string_fixed_flag(tty, data, flag,
1473 len);
1474 tty_flip_buffer_push(tty);
1475 }
1476 }
1477 spin_unlock(&priv->dp_port_lock);
1478 tty_kref_put(tty);
1479
1480 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1481 dbg("%s: got RECEIVE_DISABLE", __func__);
1482 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1483 dbg("%s: unknown opcode: %d", __func__, opcode);
1484
1485 return throttled ? 1 : 0;
1486
1487 }
1488
1489
1490 /*
1491 * Digi Read OOB Callback
1492 *
1493 * Digi Read OOB Callback handles reads on the out of band port.
1494 * When called we know port and port->private are not NULL and
1495 * the port->serial is valid. It returns 0 if successful, and
1496 * -1 if the sanity checks failed.
1497 */
1498
1499 static int digi_read_oob_callback(struct urb *urb)
1500 {
1501
1502 struct usb_serial_port *port = urb->context;
1503 struct usb_serial *serial = port->serial;
1504 struct tty_struct *tty;
1505 struct digi_port *priv = usb_get_serial_port_data(port);
1506 int opcode, line, status, val;
1507 int i;
1508 unsigned int rts;
1509
1510 dbg("digi_read_oob_callback: port=%d, len=%d",
1511 priv->dp_port_num, urb->actual_length);
1512
1513 /* handle each oob command */
1514 for (i = 0; i < urb->actual_length - 3;) {
1515 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1516 line = ((unsigned char *)urb->transfer_buffer)[i++];
1517 status = ((unsigned char *)urb->transfer_buffer)[i++];
1518 val = ((unsigned char *)urb->transfer_buffer)[i++];
1519
1520 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1521 opcode, line, status, val);
1522
1523 if (status != 0 || line >= serial->type->num_ports)
1524 continue;
1525
1526 port = serial->port[line];
1527
1528 priv = usb_get_serial_port_data(port);
1529 if (priv == NULL)
1530 return -1;
1531
1532 tty = tty_port_tty_get(&port->port);
1533
1534 rts = 0;
1535 if (tty)
1536 rts = tty->termios->c_cflag & CRTSCTS;
1537
1538 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1539 spin_lock(&priv->dp_port_lock);
1540 /* convert from digi flags to termiox flags */
1541 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1542 priv->dp_modem_signals |= TIOCM_CTS;
1543 /* port must be open to use tty struct */
1544 if (rts) {
1545 tty->hw_stopped = 0;
1546 digi_wakeup_write(port);
1547 }
1548 } else {
1549 priv->dp_modem_signals &= ~TIOCM_CTS;
1550 /* port must be open to use tty struct */
1551 if (rts)
1552 tty->hw_stopped = 1;
1553 }
1554 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1555 priv->dp_modem_signals |= TIOCM_DSR;
1556 else
1557 priv->dp_modem_signals &= ~TIOCM_DSR;
1558 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1559 priv->dp_modem_signals |= TIOCM_RI;
1560 else
1561 priv->dp_modem_signals &= ~TIOCM_RI;
1562 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1563 priv->dp_modem_signals |= TIOCM_CD;
1564 else
1565 priv->dp_modem_signals &= ~TIOCM_CD;
1566
1567 wake_up_interruptible(&priv->dp_modem_change_wait);
1568 spin_unlock(&priv->dp_port_lock);
1569 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1570 spin_lock(&priv->dp_port_lock);
1571 priv->dp_transmit_idle = 1;
1572 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1573 spin_unlock(&priv->dp_port_lock);
1574 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1575 wake_up_interruptible(&priv->dp_flush_wait);
1576 }
1577 tty_kref_put(tty);
1578 }
1579 return 0;
1580
1581 }
1582
1583 static int __init digi_init(void)
1584 {
1585 int retval;
1586 retval = usb_serial_register(&digi_acceleport_2_device);
1587 if (retval)
1588 goto failed_acceleport_2_device;
1589 retval = usb_serial_register(&digi_acceleport_4_device);
1590 if (retval)
1591 goto failed_acceleport_4_device;
1592 retval = usb_register(&digi_driver);
1593 if (retval)
1594 goto failed_usb_register;
1595 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1596 DRIVER_DESC "\n");
1597 return 0;
1598 failed_usb_register:
1599 usb_serial_deregister(&digi_acceleport_4_device);
1600 failed_acceleport_4_device:
1601 usb_serial_deregister(&digi_acceleport_2_device);
1602 failed_acceleport_2_device:
1603 return retval;
1604 }
1605
1606 static void __exit digi_exit (void)
1607 {
1608 usb_deregister(&digi_driver);
1609 usb_serial_deregister(&digi_acceleport_2_device);
1610 usb_serial_deregister(&digi_acceleport_4_device);
1611 }
1612
1613
1614 module_init(digi_init);
1615 module_exit(digi_exit);
1616
1617
1618 MODULE_AUTHOR(DRIVER_AUTHOR);
1619 MODULE_DESCRIPTION(DRIVER_DESC);
1620 MODULE_LICENSE("GPL");
1621
1622 module_param(debug, bool, S_IRUGO | S_IWUSR);
1623 MODULE_PARM_DESC(debug, "Debug enabled or not");