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Linux 4.2.1
[linux/fpc-iii.git] / drivers / usb / serial / digi_acceleport.c
blob12b0e67473ba2509193bf06048b4c0ff627430d5
1 /*
2 * Digi AccelePort USB-4 and USB-2 Serial Converters
3 *
4 * Copyright 2000 by Digi International
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
12 * usb-serial driver.
13 *
14 * Peter Berger (pberger@brimson.com)
15 * Al Borchers (borchers@steinerpoint.com)
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/slab.h>
21 #include <linux/tty.h>
22 #include <linux/tty_driver.h>
23 #include <linux/tty_flip.h>
24 #include <linux/module.h>
25 #include <linux/spinlock.h>
26 #include <linux/workqueue.h>
27 #include <linux/uaccess.h>
28 #include <linux/usb.h>
29 #include <linux/wait.h>
30 #include <linux/usb/serial.h>
31
32 /* Defines */
33
34 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
35 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
36
37 /* port output buffer length -- must be <= transfer buffer length - 2 */
38 /* so we can be sure to send the full buffer in one urb */
39 #define DIGI_OUT_BUF_SIZE 8
40
41 /* port input buffer length -- must be >= transfer buffer length - 3 */
42 /* so we can be sure to hold at least one full buffer from one urb */
43 #define DIGI_IN_BUF_SIZE 64
44
45 /* retry timeout while sleeping */
46 #define DIGI_RETRY_TIMEOUT (HZ/10)
47
48 /* timeout while waiting for tty output to drain in close */
49 /* this delay is used twice in close, so the total delay could */
50 /* be twice this value */
51 #define DIGI_CLOSE_TIMEOUT (5*HZ)
52
53
54 /* AccelePort USB Defines */
55
56 /* ids */
57 #define DIGI_VENDOR_ID 0x05c5
58 #define DIGI_2_ID 0x0002 /* USB-2 */
59 #define DIGI_4_ID 0x0004 /* USB-4 */
60
61 /* commands
62 * "INB": can be used on the in-band endpoint
63 * "OOB": can be used on the out-of-band endpoint
64 */
65 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
66 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
67 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
68 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
69 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
70 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
71 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
72 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
73 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
74 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
75 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
76 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
77 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
78 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
79 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
80 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
81 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
82 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
83 #define DIGI_CMD_SEND_DATA 18 /* INB */
84 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
85 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
86 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
87
88 /* baud rates */
89 #define DIGI_BAUD_50 0
90 #define DIGI_BAUD_75 1
91 #define DIGI_BAUD_110 2
92 #define DIGI_BAUD_150 3
93 #define DIGI_BAUD_200 4
94 #define DIGI_BAUD_300 5
95 #define DIGI_BAUD_600 6
96 #define DIGI_BAUD_1200 7
97 #define DIGI_BAUD_1800 8
98 #define DIGI_BAUD_2400 9
99 #define DIGI_BAUD_4800 10
100 #define DIGI_BAUD_7200 11
101 #define DIGI_BAUD_9600 12
102 #define DIGI_BAUD_14400 13
103 #define DIGI_BAUD_19200 14
104 #define DIGI_BAUD_28800 15
105 #define DIGI_BAUD_38400 16
106 #define DIGI_BAUD_57600 17
107 #define DIGI_BAUD_76800 18
108 #define DIGI_BAUD_115200 19
109 #define DIGI_BAUD_153600 20
110 #define DIGI_BAUD_230400 21
111 #define DIGI_BAUD_460800 22
112
113 /* arguments */
114 #define DIGI_WORD_SIZE_5 0
115 #define DIGI_WORD_SIZE_6 1
116 #define DIGI_WORD_SIZE_7 2
117 #define DIGI_WORD_SIZE_8 3
118
119 #define DIGI_PARITY_NONE 0
120 #define DIGI_PARITY_ODD 1
121 #define DIGI_PARITY_EVEN 2
122 #define DIGI_PARITY_MARK 3
123 #define DIGI_PARITY_SPACE 4
124
125 #define DIGI_STOP_BITS_1 0
126 #define DIGI_STOP_BITS_2 1
127
128 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
129 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
130 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
131
132 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
133 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
134 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
135
136 #define DIGI_DTR_INACTIVE 0
137 #define DIGI_DTR_ACTIVE 1
138 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
139
140 #define DIGI_RTS_INACTIVE 0
141 #define DIGI_RTS_ACTIVE 1
142 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
143 #define DIGI_RTS_TOGGLE 3
144
145 #define DIGI_FLUSH_TX 1
146 #define DIGI_FLUSH_RX 2
147 #define DIGI_RESUME_TX 4 /* clears xoff condition */
148
149 #define DIGI_TRANSMIT_NOT_IDLE 0
150 #define DIGI_TRANSMIT_IDLE 1
151
152 #define DIGI_DISABLE 0
153 #define DIGI_ENABLE 1
154
155 #define DIGI_DEASSERT 0
156 #define DIGI_ASSERT 1
157
158 /* in band status codes */
159 #define DIGI_OVERRUN_ERROR 4
160 #define DIGI_PARITY_ERROR 8
161 #define DIGI_FRAMING_ERROR 16
162 #define DIGI_BREAK_ERROR 32
163
164 /* out of band status */
165 #define DIGI_NO_ERROR 0
166 #define DIGI_BAD_FIRST_PARAMETER 1
167 #define DIGI_BAD_SECOND_PARAMETER 2
168 #define DIGI_INVALID_LINE 3
169 #define DIGI_INVALID_OPCODE 4
170
171 /* input signals */
172 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
173 #define DIGI_READ_INPUT_SIGNALS_ERR 2
174 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
175 #define DIGI_READ_INPUT_SIGNALS_PE 8
176 #define DIGI_READ_INPUT_SIGNALS_CTS 16
177 #define DIGI_READ_INPUT_SIGNALS_DSR 32
178 #define DIGI_READ_INPUT_SIGNALS_RI 64
179 #define DIGI_READ_INPUT_SIGNALS_DCD 128
180
181
182 /* Structures */
183
184 struct digi_serial {
185 spinlock_t ds_serial_lock;
186 struct usb_serial_port *ds_oob_port; /* out-of-band port */
187 int ds_oob_port_num; /* index of out-of-band port */
188 int ds_device_started;
189 };
190
191 struct digi_port {
192 spinlock_t dp_port_lock;
193 int dp_port_num;
194 int dp_out_buf_len;
195 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
196 int dp_write_urb_in_use;
197 unsigned int dp_modem_signals;
198 int dp_transmit_idle;
199 wait_queue_head_t dp_transmit_idle_wait;
200 int dp_throttled;
201 int dp_throttle_restart;
202 wait_queue_head_t dp_flush_wait;
203 wait_queue_head_t dp_close_wait; /* wait queue for close */
204 struct work_struct dp_wakeup_work;
205 struct usb_serial_port *dp_port;
206 };
207
208
209 /* Local Function Declarations */
210
211 static void digi_wakeup_write_lock(struct work_struct *work);
212 static int digi_write_oob_command(struct usb_serial_port *port,
213 unsigned char *buf, int count, int interruptible);
214 static int digi_write_inb_command(struct usb_serial_port *port,
215 unsigned char *buf, int count, unsigned long timeout);
216 static int digi_set_modem_signals(struct usb_serial_port *port,
217 unsigned int modem_signals, int interruptible);
218 static int digi_transmit_idle(struct usb_serial_port *port,
219 unsigned long timeout);
220 static void digi_rx_throttle(struct tty_struct *tty);
221 static void digi_rx_unthrottle(struct tty_struct *tty);
222 static void digi_set_termios(struct tty_struct *tty,
223 struct usb_serial_port *port, struct ktermios *old_termios);
224 static void digi_break_ctl(struct tty_struct *tty, int break_state);
225 static int digi_tiocmget(struct tty_struct *tty);
226 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
227 unsigned int clear);
228 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
229 const unsigned char *buf, int count);
230 static void digi_write_bulk_callback(struct urb *urb);
231 static int digi_write_room(struct tty_struct *tty);
232 static int digi_chars_in_buffer(struct tty_struct *tty);
233 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
234 static void digi_close(struct usb_serial_port *port);
235 static void digi_dtr_rts(struct usb_serial_port *port, int on);
236 static int digi_startup_device(struct usb_serial *serial);
237 static int digi_startup(struct usb_serial *serial);
238 static void digi_disconnect(struct usb_serial *serial);
239 static void digi_release(struct usb_serial *serial);
240 static int digi_port_probe(struct usb_serial_port *port);
241 static int digi_port_remove(struct usb_serial_port *port);
242 static void digi_read_bulk_callback(struct urb *urb);
243 static int digi_read_inb_callback(struct urb *urb);
244 static int digi_read_oob_callback(struct urb *urb);
245
246
247 static const struct usb_device_id id_table_combined[] = {
248 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
249 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
250 { } /* Terminating entry */
251 };
252
253 static const struct usb_device_id id_table_2[] = {
254 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
255 { } /* Terminating entry */
256 };
257
258 static const struct usb_device_id id_table_4[] = {
259 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
260 { } /* Terminating entry */
261 };
262
263 MODULE_DEVICE_TABLE(usb, id_table_combined);
264
265 /* device info needed for the Digi serial converter */
266
267 static struct usb_serial_driver digi_acceleport_2_device = {
268 .driver = {
269 .owner = THIS_MODULE,
270 .name = "digi_2",
271 },
272 .description = "Digi 2 port USB adapter",
273 .id_table = id_table_2,
274 .num_ports = 3,
275 .open = digi_open,
276 .close = digi_close,
277 .dtr_rts = digi_dtr_rts,
278 .write = digi_write,
279 .write_room = digi_write_room,
280 .write_bulk_callback = digi_write_bulk_callback,
281 .read_bulk_callback = digi_read_bulk_callback,
282 .chars_in_buffer = digi_chars_in_buffer,
283 .throttle = digi_rx_throttle,
284 .unthrottle = digi_rx_unthrottle,
285 .set_termios = digi_set_termios,
286 .break_ctl = digi_break_ctl,
287 .tiocmget = digi_tiocmget,
288 .tiocmset = digi_tiocmset,
289 .attach = digi_startup,
290 .disconnect = digi_disconnect,
291 .release = digi_release,
292 .port_probe = digi_port_probe,
293 .port_remove = digi_port_remove,
294 };
295
296 static struct usb_serial_driver digi_acceleport_4_device = {
297 .driver = {
298 .owner = THIS_MODULE,
299 .name = "digi_4",
300 },
301 .description = "Digi 4 port USB adapter",
302 .id_table = id_table_4,
303 .num_ports = 4,
304 .open = digi_open,
305 .close = digi_close,
306 .write = digi_write,
307 .write_room = digi_write_room,
308 .write_bulk_callback = digi_write_bulk_callback,
309 .read_bulk_callback = digi_read_bulk_callback,
310 .chars_in_buffer = digi_chars_in_buffer,
311 .throttle = digi_rx_throttle,
312 .unthrottle = digi_rx_unthrottle,
313 .set_termios = digi_set_termios,
314 .break_ctl = digi_break_ctl,
315 .tiocmget = digi_tiocmget,
316 .tiocmset = digi_tiocmset,
317 .attach = digi_startup,
318 .disconnect = digi_disconnect,
319 .release = digi_release,
320 .port_probe = digi_port_probe,
321 .port_remove = digi_port_remove,
322 };
323
324 static struct usb_serial_driver * const serial_drivers[] = {
325 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
326 };
327
328 /* Functions */
329
330 /*
331 * Cond Wait Interruptible Timeout Irqrestore
332 *
333 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
334 * so that wake ups are not lost if they occur between the unlock
335 * and the sleep. In other words, spin_unlock_irqrestore and
336 * interruptible_sleep_on_timeout are "atomic" with respect to
337 * wake ups. This is used to implement condition variables.
338 *
339 * interruptible_sleep_on_timeout is deprecated and has been replaced
340 * with the equivalent code.
341 */
342
343 static long cond_wait_interruptible_timeout_irqrestore(
344 wait_queue_head_t *q, long timeout,
345 spinlock_t *lock, unsigned long flags)
346 __releases(lock)
347 {
348 DEFINE_WAIT(wait);
349
350 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
351 spin_unlock_irqrestore(lock, flags);
352 timeout = schedule_timeout(timeout);
353 finish_wait(q, &wait);
354
355 return timeout;
356 }
357
358
359 /*
360 * Digi Wakeup Write
361 *
362 * Wake up port, line discipline, and tty processes sleeping
363 * on writes.
364 */
365
366 static void digi_wakeup_write_lock(struct work_struct *work)
367 {
368 struct digi_port *priv =
369 container_of(work, struct digi_port, dp_wakeup_work);
370 struct usb_serial_port *port = priv->dp_port;
371 unsigned long flags;
372
373 spin_lock_irqsave(&priv->dp_port_lock, flags);
374 tty_port_tty_wakeup(&port->port);
375 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
376 }
377
378 /*
379 * Digi Write OOB Command
380 *
381 * Write commands on the out of band port. Commands are 4
382 * bytes each, multiple commands can be sent at once, and
383 * no command will be split across USB packets. Returns 0
384 * if successful, -EINTR if interrupted while sleeping and
385 * the interruptible flag is true, or a negative error
386 * returned by usb_submit_urb.
387 */
388
389 static int digi_write_oob_command(struct usb_serial_port *port,
390 unsigned char *buf, int count, int interruptible)
391 {
392 int ret = 0;
393 int len;
394 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
395 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
396 unsigned long flags = 0;
397
398 dev_dbg(&port->dev,
399 "digi_write_oob_command: TOP: port=%d, count=%d\n",
400 oob_priv->dp_port_num, count);
401
402 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
403 while (count > 0) {
404 while (oob_priv->dp_write_urb_in_use) {
405 cond_wait_interruptible_timeout_irqrestore(
406 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
407 &oob_priv->dp_port_lock, flags);
408 if (interruptible && signal_pending(current))
409 return -EINTR;
410 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
411 }
412
413 /* len must be a multiple of 4, so commands are not split */
414 len = min(count, oob_port->bulk_out_size);
415 if (len > 4)
416 len &= ~3;
417 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
418 oob_port->write_urb->transfer_buffer_length = len;
419 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
420 if (ret == 0) {
421 oob_priv->dp_write_urb_in_use = 1;
422 count -= len;
423 buf += len;
424 }
425 }
426 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
427 if (ret)
428 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
429 __func__, ret);
430 return ret;
431
432 }
433
434
435 /*
436 * Digi Write In Band Command
437 *
438 * Write commands on the given port. Commands are 4
439 * bytes each, multiple commands can be sent at once, and
440 * no command will be split across USB packets. If timeout
441 * is non-zero, write in band command will return after
442 * waiting unsuccessfully for the URB status to clear for
443 * timeout ticks. Returns 0 if successful, or a negative
444 * error returned by digi_write.
445 */
446
447 static int digi_write_inb_command(struct usb_serial_port *port,
448 unsigned char *buf, int count, unsigned long timeout)
449 {
450 int ret = 0;
451 int len;
452 struct digi_port *priv = usb_get_serial_port_data(port);
453 unsigned char *data = port->write_urb->transfer_buffer;
454 unsigned long flags = 0;
455
456 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
457 priv->dp_port_num, count);
458
459 if (timeout)
460 timeout += jiffies;
461 else
462 timeout = ULONG_MAX;
463
464 spin_lock_irqsave(&priv->dp_port_lock, flags);
465 while (count > 0 && ret == 0) {
466 while (priv->dp_write_urb_in_use &&
467 time_before(jiffies, timeout)) {
468 cond_wait_interruptible_timeout_irqrestore(
469 &port->write_wait, DIGI_RETRY_TIMEOUT,
470 &priv->dp_port_lock, flags);
471 if (signal_pending(current))
472 return -EINTR;
473 spin_lock_irqsave(&priv->dp_port_lock, flags);
474 }
475
476 /* len must be a multiple of 4 and small enough to */
477 /* guarantee the write will send buffered data first, */
478 /* so commands are in order with data and not split */
479 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
480 if (len > 4)
481 len &= ~3;
482
483 /* write any buffered data first */
484 if (priv->dp_out_buf_len > 0) {
485 data[0] = DIGI_CMD_SEND_DATA;
486 data[1] = priv->dp_out_buf_len;
487 memcpy(data + 2, priv->dp_out_buf,
488 priv->dp_out_buf_len);
489 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
490 port->write_urb->transfer_buffer_length
491 = priv->dp_out_buf_len + 2 + len;
492 } else {
493 memcpy(data, buf, len);
494 port->write_urb->transfer_buffer_length = len;
495 }
496
497 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
498 if (ret == 0) {
499 priv->dp_write_urb_in_use = 1;
500 priv->dp_out_buf_len = 0;
501 count -= len;
502 buf += len;
503 }
504
505 }
506 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
507
508 if (ret)
509 dev_err(&port->dev,
510 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
511 __func__, ret, priv->dp_port_num);
512 return ret;
513 }
514
515
516 /*
517 * Digi Set Modem Signals
518 *
519 * Sets or clears DTR and RTS on the port, according to the
520 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
521 * for the modem_signals argument. Returns 0 if successful,
522 * -EINTR if interrupted while sleeping, or a non-zero error
523 * returned by usb_submit_urb.
524 */
525
526 static int digi_set_modem_signals(struct usb_serial_port *port,
527 unsigned int modem_signals, int interruptible)
528 {
529
530 int ret;
531 struct digi_port *port_priv = usb_get_serial_port_data(port);
532 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
533 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
534 unsigned char *data = oob_port->write_urb->transfer_buffer;
535 unsigned long flags = 0;
536
537
538 dev_dbg(&port->dev,
539 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
540 port_priv->dp_port_num, modem_signals);
541
542 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
543 spin_lock(&port_priv->dp_port_lock);
544
545 while (oob_priv->dp_write_urb_in_use) {
546 spin_unlock(&port_priv->dp_port_lock);
547 cond_wait_interruptible_timeout_irqrestore(
548 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
549 &oob_priv->dp_port_lock, flags);
550 if (interruptible && signal_pending(current))
551 return -EINTR;
552 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
553 spin_lock(&port_priv->dp_port_lock);
554 }
555 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
556 data[1] = port_priv->dp_port_num;
557 data[2] = (modem_signals & TIOCM_DTR) ?
558 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
559 data[3] = 0;
560 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
561 data[5] = port_priv->dp_port_num;
562 data[6] = (modem_signals & TIOCM_RTS) ?
563 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
564 data[7] = 0;
565
566 oob_port->write_urb->transfer_buffer_length = 8;
567
568 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
569 if (ret == 0) {
570 oob_priv->dp_write_urb_in_use = 1;
571 port_priv->dp_modem_signals =
572 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
573 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
574 }
575 spin_unlock(&port_priv->dp_port_lock);
576 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
577 if (ret)
578 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
579 __func__, ret);
580 return ret;
581 }
582
583 /*
584 * Digi Transmit Idle
585 *
586 * Digi transmit idle waits, up to timeout ticks, for the transmitter
587 * to go idle. It returns 0 if successful or a negative error.
588 *
589 * There are race conditions here if more than one process is calling
590 * digi_transmit_idle on the same port at the same time. However, this
591 * is only called from close, and only one process can be in close on a
592 * port at a time, so its ok.
593 */
594
595 static int digi_transmit_idle(struct usb_serial_port *port,
596 unsigned long timeout)
597 {
598 int ret;
599 unsigned char buf[2];
600 struct digi_port *priv = usb_get_serial_port_data(port);
601 unsigned long flags = 0;
602
603 spin_lock_irqsave(&priv->dp_port_lock, flags);
604 priv->dp_transmit_idle = 0;
605 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
606
607 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
608 buf[1] = 0;
609
610 timeout += jiffies;
611
612 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
613 if (ret != 0)
614 return ret;
615
616 spin_lock_irqsave(&priv->dp_port_lock, flags);
617
618 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
619 cond_wait_interruptible_timeout_irqrestore(
620 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
621 &priv->dp_port_lock, flags);
622 if (signal_pending(current))
623 return -EINTR;
624 spin_lock_irqsave(&priv->dp_port_lock, flags);
625 }
626 priv->dp_transmit_idle = 0;
627 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
628 return 0;
629
630 }
631
632
633 static void digi_rx_throttle(struct tty_struct *tty)
634 {
635 unsigned long flags;
636 struct usb_serial_port *port = tty->driver_data;
637 struct digi_port *priv = usb_get_serial_port_data(port);
638
639 /* stop receiving characters by not resubmitting the read urb */
640 spin_lock_irqsave(&priv->dp_port_lock, flags);
641 priv->dp_throttled = 1;
642 priv->dp_throttle_restart = 0;
643 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
644 }
645
646
647 static void digi_rx_unthrottle(struct tty_struct *tty)
648 {
649 int ret = 0;
650 unsigned long flags;
651 struct usb_serial_port *port = tty->driver_data;
652 struct digi_port *priv = usb_get_serial_port_data(port);
653
654 spin_lock_irqsave(&priv->dp_port_lock, flags);
655
656 /* restart read chain */
657 if (priv->dp_throttle_restart)
658 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
659
660 /* turn throttle off */
661 priv->dp_throttled = 0;
662 priv->dp_throttle_restart = 0;
663
664 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
665
666 if (ret)
667 dev_err(&port->dev,
668 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
669 __func__, ret, priv->dp_port_num);
670 }
671
672
673 static void digi_set_termios(struct tty_struct *tty,
674 struct usb_serial_port *port, struct ktermios *old_termios)
675 {
676 struct digi_port *priv = usb_get_serial_port_data(port);
677 struct device *dev = &port->dev;
678 unsigned int iflag = tty->termios.c_iflag;
679 unsigned int cflag = tty->termios.c_cflag;
680 unsigned int old_iflag = old_termios->c_iflag;
681 unsigned int old_cflag = old_termios->c_cflag;
682 unsigned char buf[32];
683 unsigned int modem_signals;
684 int arg, ret;
685 int i = 0;
686 speed_t baud;
687
688 dev_dbg(dev,
689 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
690 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
691
692 /* set baud rate */
693 baud = tty_get_baud_rate(tty);
694 if (baud != tty_termios_baud_rate(old_termios)) {
695 arg = -1;
696
697 /* reassert DTR and (maybe) RTS on transition from B0 */
698 if ((old_cflag&CBAUD) == B0) {
699 /* don't set RTS if using hardware flow control */
700 /* and throttling input */
701 modem_signals = TIOCM_DTR;
702 if (!(tty->termios.c_cflag & CRTSCTS) ||
703 !test_bit(TTY_THROTTLED, &tty->flags))
704 modem_signals |= TIOCM_RTS;
705 digi_set_modem_signals(port, modem_signals, 1);
706 }
707 switch (baud) {
708 /* drop DTR and RTS on transition to B0 */
709 case 0: digi_set_modem_signals(port, 0, 1); break;
710 case 50: arg = DIGI_BAUD_50; break;
711 case 75: arg = DIGI_BAUD_75; break;
712 case 110: arg = DIGI_BAUD_110; break;
713 case 150: arg = DIGI_BAUD_150; break;
714 case 200: arg = DIGI_BAUD_200; break;
715 case 300: arg = DIGI_BAUD_300; break;
716 case 600: arg = DIGI_BAUD_600; break;
717 case 1200: arg = DIGI_BAUD_1200; break;
718 case 1800: arg = DIGI_BAUD_1800; break;
719 case 2400: arg = DIGI_BAUD_2400; break;
720 case 4800: arg = DIGI_BAUD_4800; break;
721 case 9600: arg = DIGI_BAUD_9600; break;
722 case 19200: arg = DIGI_BAUD_19200; break;
723 case 38400: arg = DIGI_BAUD_38400; break;
724 case 57600: arg = DIGI_BAUD_57600; break;
725 case 115200: arg = DIGI_BAUD_115200; break;
726 case 230400: arg = DIGI_BAUD_230400; break;
727 case 460800: arg = DIGI_BAUD_460800; break;
728 default:
729 arg = DIGI_BAUD_9600;
730 baud = 9600;
731 break;
732 }
733 if (arg != -1) {
734 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
735 buf[i++] = priv->dp_port_num;
736 buf[i++] = arg;
737 buf[i++] = 0;
738 }
739 }
740 /* set parity */
741 tty->termios.c_cflag &= ~CMSPAR;
742
743 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
744 if (cflag&PARENB) {
745 if (cflag&PARODD)
746 arg = DIGI_PARITY_ODD;
747 else
748 arg = DIGI_PARITY_EVEN;
749 } else {
750 arg = DIGI_PARITY_NONE;
751 }
752 buf[i++] = DIGI_CMD_SET_PARITY;
753 buf[i++] = priv->dp_port_num;
754 buf[i++] = arg;
755 buf[i++] = 0;
756 }
757 /* set word size */
758 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
759 arg = -1;
760 switch (cflag&CSIZE) {
761 case CS5: arg = DIGI_WORD_SIZE_5; break;
762 case CS6: arg = DIGI_WORD_SIZE_6; break;
763 case CS7: arg = DIGI_WORD_SIZE_7; break;
764 case CS8: arg = DIGI_WORD_SIZE_8; break;
765 default:
766 dev_dbg(dev,
767 "digi_set_termios: can't handle word size %d\n",
768 (cflag&CSIZE));
769 break;
770 }
771
772 if (arg != -1) {
773 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
774 buf[i++] = priv->dp_port_num;
775 buf[i++] = arg;
776 buf[i++] = 0;
777 }
778
779 }
780
781 /* set stop bits */
782 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
783
784 if ((cflag&CSTOPB))
785 arg = DIGI_STOP_BITS_2;
786 else
787 arg = DIGI_STOP_BITS_1;
788
789 buf[i++] = DIGI_CMD_SET_STOP_BITS;
790 buf[i++] = priv->dp_port_num;
791 buf[i++] = arg;
792 buf[i++] = 0;
793
794 }
795
796 /* set input flow control */
797 if ((iflag&IXOFF) != (old_iflag&IXOFF)
798 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
799 arg = 0;
800 if (iflag&IXOFF)
801 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
802 else
803 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
804
805 if (cflag&CRTSCTS) {
806 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
807
808 /* On USB-4 it is necessary to assert RTS prior */
809 /* to selecting RTS input flow control. */
810 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
811 buf[i++] = priv->dp_port_num;
812 buf[i++] = DIGI_RTS_ACTIVE;
813 buf[i++] = 0;
814
815 } else {
816 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
817 }
818 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
819 buf[i++] = priv->dp_port_num;
820 buf[i++] = arg;
821 buf[i++] = 0;
822 }
823
824 /* set output flow control */
825 if ((iflag & IXON) != (old_iflag & IXON)
826 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
827 arg = 0;
828 if (iflag & IXON)
829 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
830 else
831 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
832
833 if (cflag & CRTSCTS) {
834 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
835 } else {
836 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
837 }
838
839 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
840 buf[i++] = priv->dp_port_num;
841 buf[i++] = arg;
842 buf[i++] = 0;
843 }
844
845 /* set receive enable/disable */
846 if ((cflag & CREAD) != (old_cflag & CREAD)) {
847 if (cflag & CREAD)
848 arg = DIGI_ENABLE;
849 else
850 arg = DIGI_DISABLE;
851
852 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
853 buf[i++] = priv->dp_port_num;
854 buf[i++] = arg;
855 buf[i++] = 0;
856 }
857 ret = digi_write_oob_command(port, buf, i, 1);
858 if (ret != 0)
859 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
860 tty_encode_baud_rate(tty, baud, baud);
861 }
862
863
864 static void digi_break_ctl(struct tty_struct *tty, int break_state)
865 {
866 struct usb_serial_port *port = tty->driver_data;
867 unsigned char buf[4];
868
869 buf[0] = DIGI_CMD_BREAK_CONTROL;
870 buf[1] = 2; /* length */
871 buf[2] = break_state ? 1 : 0;
872 buf[3] = 0; /* pad */
873 digi_write_inb_command(port, buf, 4, 0);
874 }
875
876
877 static int digi_tiocmget(struct tty_struct *tty)
878 {
879 struct usb_serial_port *port = tty->driver_data;
880 struct digi_port *priv = usb_get_serial_port_data(port);
881 unsigned int val;
882 unsigned long flags;
883
884 spin_lock_irqsave(&priv->dp_port_lock, flags);
885 val = priv->dp_modem_signals;
886 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
887 return val;
888 }
889
890
891 static int digi_tiocmset(struct tty_struct *tty,
892 unsigned int set, unsigned int clear)
893 {
894 struct usb_serial_port *port = tty->driver_data;
895 struct digi_port *priv = usb_get_serial_port_data(port);
896 unsigned int val;
897 unsigned long flags;
898
899 spin_lock_irqsave(&priv->dp_port_lock, flags);
900 val = (priv->dp_modem_signals & ~clear) | set;
901 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
902 return digi_set_modem_signals(port, val, 1);
903 }
904
905
906 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
907 const unsigned char *buf, int count)
908 {
909
910 int ret, data_len, new_len;
911 struct digi_port *priv = usb_get_serial_port_data(port);
912 unsigned char *data = port->write_urb->transfer_buffer;
913 unsigned long flags = 0;
914
915 dev_dbg(&port->dev,
916 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
917 priv->dp_port_num, count, in_interrupt());
918
919 /* copy user data (which can sleep) before getting spin lock */
920 count = min(count, port->bulk_out_size-2);
921 count = min(64, count);
922
923 /* be sure only one write proceeds at a time */
924 /* there are races on the port private buffer */
925 spin_lock_irqsave(&priv->dp_port_lock, flags);
926
927 /* wait for urb status clear to submit another urb */
928 if (priv->dp_write_urb_in_use) {
929 /* buffer data if count is 1 (probably put_char) if possible */
930 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
931 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
932 new_len = 1;
933 } else {
934 new_len = 0;
935 }
936 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
937 return new_len;
938 }
939
940 /* allow space for any buffered data and for new data, up to */
941 /* transfer buffer size - 2 (for command and length bytes) */
942 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
943 data_len = new_len + priv->dp_out_buf_len;
944
945 if (data_len == 0) {
946 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
947 return 0;
948 }
949
950 port->write_urb->transfer_buffer_length = data_len+2;
951
952 *data++ = DIGI_CMD_SEND_DATA;
953 *data++ = data_len;
954
955 /* copy in buffered data first */
956 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
957 data += priv->dp_out_buf_len;
958
959 /* copy in new data */
960 memcpy(data, buf, new_len);
961
962 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
963 if (ret == 0) {
964 priv->dp_write_urb_in_use = 1;
965 ret = new_len;
966 priv->dp_out_buf_len = 0;
967 }
968
969 /* return length of new data written, or error */
970 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
971 if (ret < 0)
972 dev_err_console(port,
973 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
974 __func__, ret, priv->dp_port_num);
975 dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
976 return ret;
977
978 }
979
980 static void digi_write_bulk_callback(struct urb *urb)
981 {
982
983 struct usb_serial_port *port = urb->context;
984 struct usb_serial *serial;
985 struct digi_port *priv;
986 struct digi_serial *serial_priv;
987 int ret = 0;
988 int status = urb->status;
989
990 /* port and serial sanity check */
991 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
992 pr_err("%s: port or port->private is NULL, status=%d\n",
993 __func__, status);
994 return;
995 }
996 serial = port->serial;
997 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
998 dev_err(&port->dev,
999 "%s: serial or serial->private is NULL, status=%d\n",
1000 __func__, status);
1001 return;
1002 }
1003
1004 /* handle oob callback */
1005 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1006 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
1007 spin_lock(&priv->dp_port_lock);
1008 priv->dp_write_urb_in_use = 0;
1009 wake_up_interruptible(&port->write_wait);
1010 spin_unlock(&priv->dp_port_lock);
1011 return;
1012 }
1013
1014 /* try to send any buffered data on this port */
1015 spin_lock(&priv->dp_port_lock);
1016 priv->dp_write_urb_in_use = 0;
1017 if (priv->dp_out_buf_len > 0) {
1018 *((unsigned char *)(port->write_urb->transfer_buffer))
1019 = (unsigned char)DIGI_CMD_SEND_DATA;
1020 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1021 = (unsigned char)priv->dp_out_buf_len;
1022 port->write_urb->transfer_buffer_length =
1023 priv->dp_out_buf_len + 2;
1024 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1025 priv->dp_out_buf_len);
1026 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1027 if (ret == 0) {
1028 priv->dp_write_urb_in_use = 1;
1029 priv->dp_out_buf_len = 0;
1030 }
1031 }
1032 /* wake up processes sleeping on writes immediately */
1033 tty_port_tty_wakeup(&port->port);
1034 /* also queue up a wakeup at scheduler time, in case we */
1035 /* lost the race in write_chan(). */
1036 schedule_work(&priv->dp_wakeup_work);
1037
1038 spin_unlock(&priv->dp_port_lock);
1039 if (ret && ret != -EPERM)
1040 dev_err_console(port,
1041 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1042 __func__, ret, priv->dp_port_num);
1043 }
1044
1045 static int digi_write_room(struct tty_struct *tty)
1046 {
1047 struct usb_serial_port *port = tty->driver_data;
1048 struct digi_port *priv = usb_get_serial_port_data(port);
1049 int room;
1050 unsigned long flags = 0;
1051
1052 spin_lock_irqsave(&priv->dp_port_lock, flags);
1053
1054 if (priv->dp_write_urb_in_use)
1055 room = 0;
1056 else
1057 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1058
1059 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1060 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
1061 return room;
1062
1063 }
1064
1065 static int digi_chars_in_buffer(struct tty_struct *tty)
1066 {
1067 struct usb_serial_port *port = tty->driver_data;
1068 struct digi_port *priv = usb_get_serial_port_data(port);
1069
1070 if (priv->dp_write_urb_in_use) {
1071 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1072 priv->dp_port_num, port->bulk_out_size - 2);
1073 /* return(port->bulk_out_size - 2); */
1074 return 256;
1075 } else {
1076 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1077 priv->dp_port_num, priv->dp_out_buf_len);
1078 return priv->dp_out_buf_len;
1079 }
1080
1081 }
1082
1083 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1084 {
1085 /* Adjust DTR and RTS */
1086 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1087 }
1088
1089 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1090 {
1091 int ret;
1092 unsigned char buf[32];
1093 struct digi_port *priv = usb_get_serial_port_data(port);
1094 struct ktermios not_termios;
1095
1096 /* be sure the device is started up */
1097 if (digi_startup_device(port->serial) != 0)
1098 return -ENXIO;
1099
1100 /* read modem signals automatically whenever they change */
1101 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1102 buf[1] = priv->dp_port_num;
1103 buf[2] = DIGI_ENABLE;
1104 buf[3] = 0;
1105
1106 /* flush fifos */
1107 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1108 buf[5] = priv->dp_port_num;
1109 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1110 buf[7] = 0;
1111
1112 ret = digi_write_oob_command(port, buf, 8, 1);
1113 if (ret != 0)
1114 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1115
1116 /* set termios settings */
1117 if (tty) {
1118 not_termios.c_cflag = ~tty->termios.c_cflag;
1119 not_termios.c_iflag = ~tty->termios.c_iflag;
1120 digi_set_termios(tty, port, &not_termios);
1121 }
1122 return 0;
1123 }
1124
1125
1126 static void digi_close(struct usb_serial_port *port)
1127 {
1128 DEFINE_WAIT(wait);
1129 int ret;
1130 unsigned char buf[32];
1131 struct digi_port *priv = usb_get_serial_port_data(port);
1132
1133 mutex_lock(&port->serial->disc_mutex);
1134 /* if disconnected, just clear flags */
1135 if (port->serial->disconnected)
1136 goto exit;
1137
1138 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1139 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1140
1141 /* disable input flow control */
1142 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1143 buf[1] = priv->dp_port_num;
1144 buf[2] = DIGI_DISABLE;
1145 buf[3] = 0;
1146
1147 /* disable output flow control */
1148 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1149 buf[5] = priv->dp_port_num;
1150 buf[6] = DIGI_DISABLE;
1151 buf[7] = 0;
1152
1153 /* disable reading modem signals automatically */
1154 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1155 buf[9] = priv->dp_port_num;
1156 buf[10] = DIGI_DISABLE;
1157 buf[11] = 0;
1158
1159 /* disable receive */
1160 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1161 buf[13] = priv->dp_port_num;
1162 buf[14] = DIGI_DISABLE;
1163 buf[15] = 0;
1164
1165 /* flush fifos */
1166 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1167 buf[17] = priv->dp_port_num;
1168 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1169 buf[19] = 0;
1170
1171 ret = digi_write_oob_command(port, buf, 20, 0);
1172 if (ret != 0)
1173 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",
1174 ret);
1175 /* wait for final commands on oob port to complete */
1176 prepare_to_wait(&priv->dp_flush_wait, &wait,
1177 TASK_INTERRUPTIBLE);
1178 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1179 finish_wait(&priv->dp_flush_wait, &wait);
1180
1181 /* shutdown any outstanding bulk writes */
1182 usb_kill_urb(port->write_urb);
1183 exit:
1184 spin_lock_irq(&priv->dp_port_lock);
1185 priv->dp_write_urb_in_use = 0;
1186 wake_up_interruptible(&priv->dp_close_wait);
1187 spin_unlock_irq(&priv->dp_port_lock);
1188 mutex_unlock(&port->serial->disc_mutex);
1189 }
1190
1191
1192 /*
1193 * Digi Startup Device
1194 *
1195 * Starts reads on all ports. Must be called AFTER startup, with
1196 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1197 */
1198
1199 static int digi_startup_device(struct usb_serial *serial)
1200 {
1201 int i, ret = 0;
1202 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1203 struct usb_serial_port *port;
1204
1205 /* be sure this happens exactly once */
1206 spin_lock(&serial_priv->ds_serial_lock);
1207 if (serial_priv->ds_device_started) {
1208 spin_unlock(&serial_priv->ds_serial_lock);
1209 return 0;
1210 }
1211 serial_priv->ds_device_started = 1;
1212 spin_unlock(&serial_priv->ds_serial_lock);
1213
1214 /* start reading from each bulk in endpoint for the device */
1215 /* set USB_DISABLE_SPD flag for write bulk urbs */
1216 for (i = 0; i < serial->type->num_ports + 1; i++) {
1217 port = serial->port[i];
1218 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1219 if (ret != 0) {
1220 dev_err(&port->dev,
1221 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1222 __func__, ret, i);
1223 break;
1224 }
1225 }
1226 return ret;
1227 }
1228
1229 static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1230 {
1231 struct digi_port *priv;
1232
1233 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1234 if (!priv)
1235 return -ENOMEM;
1236
1237 spin_lock_init(&priv->dp_port_lock);
1238 priv->dp_port_num = port_num;
1239 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1240 init_waitqueue_head(&priv->dp_flush_wait);
1241 init_waitqueue_head(&priv->dp_close_wait);
1242 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1243 priv->dp_port = port;
1244
1245 init_waitqueue_head(&port->write_wait);
1246
1247 usb_set_serial_port_data(port, priv);
1248
1249 return 0;
1250 }
1251
1252 static int digi_startup(struct usb_serial *serial)
1253 {
1254 struct digi_serial *serial_priv;
1255 int ret;
1256
1257 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1258 if (!serial_priv)
1259 return -ENOMEM;
1260
1261 spin_lock_init(&serial_priv->ds_serial_lock);
1262 serial_priv->ds_oob_port_num = serial->type->num_ports;
1263 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1264
1265 ret = digi_port_init(serial_priv->ds_oob_port,
1266 serial_priv->ds_oob_port_num);
1267 if (ret) {
1268 kfree(serial_priv);
1269 return ret;
1270 }
1271
1272 usb_set_serial_data(serial, serial_priv);
1273
1274 return 0;
1275 }
1276
1277
1278 static void digi_disconnect(struct usb_serial *serial)
1279 {
1280 int i;
1281
1282 /* stop reads and writes on all ports */
1283 for (i = 0; i < serial->type->num_ports + 1; i++) {
1284 usb_kill_urb(serial->port[i]->read_urb);
1285 usb_kill_urb(serial->port[i]->write_urb);
1286 }
1287 }
1288
1289
1290 static void digi_release(struct usb_serial *serial)
1291 {
1292 struct digi_serial *serial_priv;
1293 struct digi_port *priv;
1294
1295 serial_priv = usb_get_serial_data(serial);
1296
1297 priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
1298 kfree(priv);
1299
1300 kfree(serial_priv);
1301 }
1302
1303 static int digi_port_probe(struct usb_serial_port *port)
1304 {
1305 return digi_port_init(port, port->port_number);
1306 }
1307
1308 static int digi_port_remove(struct usb_serial_port *port)
1309 {
1310 struct digi_port *priv;
1311
1312 priv = usb_get_serial_port_data(port);
1313 kfree(priv);
1314
1315 return 0;
1316 }
1317
1318 static void digi_read_bulk_callback(struct urb *urb)
1319 {
1320 struct usb_serial_port *port = urb->context;
1321 struct digi_port *priv;
1322 struct digi_serial *serial_priv;
1323 int ret;
1324 int status = urb->status;
1325
1326 /* port sanity check, do not resubmit if port is not valid */
1327 if (port == NULL)
1328 return;
1329 priv = usb_get_serial_port_data(port);
1330 if (priv == NULL) {
1331 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1332 __func__, status);
1333 return;
1334 }
1335 if (port->serial == NULL ||
1336 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1337 dev_err(&port->dev, "%s: serial is bad or serial->private "
1338 "is NULL, status=%d\n", __func__, status);
1339 return;
1340 }
1341
1342 /* do not resubmit urb if it has any status error */
1343 if (status) {
1344 dev_err(&port->dev,
1345 "%s: nonzero read bulk status: status=%d, port=%d\n",
1346 __func__, status, priv->dp_port_num);
1347 return;
1348 }
1349
1350 /* handle oob or inb callback, do not resubmit if error */
1351 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1352 if (digi_read_oob_callback(urb) != 0)
1353 return;
1354 } else {
1355 if (digi_read_inb_callback(urb) != 0)
1356 return;
1357 }
1358
1359 /* continue read */
1360 ret = usb_submit_urb(urb, GFP_ATOMIC);
1361 if (ret != 0 && ret != -EPERM) {
1362 dev_err(&port->dev,
1363 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1364 __func__, ret, priv->dp_port_num);
1365 }
1366
1367 }
1368
1369 /*
1370 * Digi Read INB Callback
1371 *
1372 * Digi Read INB Callback handles reads on the in band ports, sending
1373 * the data on to the tty subsystem. When called we know port and
1374 * port->private are not NULL and port->serial has been validated.
1375 * It returns 0 if successful, 1 if successful but the port is
1376 * throttled, and -1 if the sanity checks failed.
1377 */
1378
1379 static int digi_read_inb_callback(struct urb *urb)
1380 {
1381 struct usb_serial_port *port = urb->context;
1382 struct digi_port *priv = usb_get_serial_port_data(port);
1383 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1384 int len = ((unsigned char *)urb->transfer_buffer)[1];
1385 int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1386 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1387 int flag, throttled;
1388 int status = urb->status;
1389
1390 /* do not process callbacks on closed ports */
1391 /* but do continue the read chain */
1392 if (urb->status == -ENOENT)
1393 return 0;
1394
1395 /* short/multiple packet check */
1396 if (urb->actual_length != len + 2) {
1397 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1398 "status=%d, port=%d, opcode=%d, len=%d, "
1399 "actual_length=%d, status=%d\n", __func__, status,
1400 priv->dp_port_num, opcode, len, urb->actual_length,
1401 port_status);
1402 return -1;
1403 }
1404
1405 spin_lock(&priv->dp_port_lock);
1406
1407 /* check for throttle; if set, do not resubmit read urb */
1408 /* indicate the read chain needs to be restarted on unthrottle */
1409 throttled = priv->dp_throttled;
1410 if (throttled)
1411 priv->dp_throttle_restart = 1;
1412
1413 /* receive data */
1414 if (opcode == DIGI_CMD_RECEIVE_DATA) {
1415 /* get flag from port_status */
1416 flag = 0;
1417
1418 /* overrun is special, not associated with a char */
1419 if (port_status & DIGI_OVERRUN_ERROR)
1420 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1421
1422 /* break takes precedence over parity, */
1423 /* which takes precedence over framing errors */
1424 if (port_status & DIGI_BREAK_ERROR)
1425 flag = TTY_BREAK;
1426 else if (port_status & DIGI_PARITY_ERROR)
1427 flag = TTY_PARITY;
1428 else if (port_status & DIGI_FRAMING_ERROR)
1429 flag = TTY_FRAME;
1430
1431 /* data length is len-1 (one byte of len is port_status) */
1432 --len;
1433 if (len > 0) {
1434 tty_insert_flip_string_fixed_flag(&port->port, data,
1435 flag, len);
1436 tty_flip_buffer_push(&port->port);
1437 }
1438 }
1439 spin_unlock(&priv->dp_port_lock);
1440
1441 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1442 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1443 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1444 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1445
1446 return throttled ? 1 : 0;
1447
1448 }
1449
1450
1451 /*
1452 * Digi Read OOB Callback
1453 *
1454 * Digi Read OOB Callback handles reads on the out of band port.
1455 * When called we know port and port->private are not NULL and
1456 * the port->serial is valid. It returns 0 if successful, and
1457 * -1 if the sanity checks failed.
1458 */
1459
1460 static int digi_read_oob_callback(struct urb *urb)
1461 {
1462
1463 struct usb_serial_port *port = urb->context;
1464 struct usb_serial *serial = port->serial;
1465 struct tty_struct *tty;
1466 struct digi_port *priv = usb_get_serial_port_data(port);
1467 int opcode, line, status, val;
1468 int i;
1469 unsigned int rts;
1470
1471 /* handle each oob command */
1472 for (i = 0; i < urb->actual_length - 3;) {
1473 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1474 line = ((unsigned char *)urb->transfer_buffer)[i++];
1475 status = ((unsigned char *)urb->transfer_buffer)[i++];
1476 val = ((unsigned char *)urb->transfer_buffer)[i++];
1477
1478 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1479 opcode, line, status, val);
1480
1481 if (status != 0 || line >= serial->type->num_ports)
1482 continue;
1483
1484 port = serial->port[line];
1485
1486 priv = usb_get_serial_port_data(port);
1487 if (priv == NULL)
1488 return -1;
1489
1490 tty = tty_port_tty_get(&port->port);
1491
1492 rts = 0;
1493 if (tty)
1494 rts = tty->termios.c_cflag & CRTSCTS;
1495
1496 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1497 spin_lock(&priv->dp_port_lock);
1498 /* convert from digi flags to termiox flags */
1499 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1500 priv->dp_modem_signals |= TIOCM_CTS;
1501 /* port must be open to use tty struct */
1502 if (rts)
1503 tty_port_tty_wakeup(&port->port);
1504 } else {
1505 priv->dp_modem_signals &= ~TIOCM_CTS;
1506 /* port must be open to use tty struct */
1507 }
1508 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1509 priv->dp_modem_signals |= TIOCM_DSR;
1510 else
1511 priv->dp_modem_signals &= ~TIOCM_DSR;
1512 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1513 priv->dp_modem_signals |= TIOCM_RI;
1514 else
1515 priv->dp_modem_signals &= ~TIOCM_RI;
1516 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1517 priv->dp_modem_signals |= TIOCM_CD;
1518 else
1519 priv->dp_modem_signals &= ~TIOCM_CD;
1520
1521 spin_unlock(&priv->dp_port_lock);
1522 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1523 spin_lock(&priv->dp_port_lock);
1524 priv->dp_transmit_idle = 1;
1525 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1526 spin_unlock(&priv->dp_port_lock);
1527 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1528 wake_up_interruptible(&priv->dp_flush_wait);
1529 }
1530 tty_kref_put(tty);
1531 }
1532 return 0;
1533
1534 }
1535
1536 module_usb_serial_driver(serial_drivers, id_table_combined);
1537
1538 MODULE_AUTHOR(DRIVER_AUTHOR);
1539 MODULE_DESCRIPTION(DRIVER_DESC);
1540 MODULE_LICENSE("GPL");
Linux with added FPC-III support