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USB: serial: digi_acceleport: fix write-wakeup deadlocks
[linux/fpc-iii.git] / drivers / usb / serial / digi_acceleport.c
blob4aa6fe834091e8a147f22f61e392c4b274518c6a
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/uaccess.h>
27 #include <linux/usb.h>
28 #include <linux/wait.h>
29 #include <linux/usb/serial.h>
30
31 /* Defines */
32
33 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
34 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
35
36 /* port output buffer length -- must be <= transfer buffer length - 2 */
37 /* so we can be sure to send the full buffer in one urb */
38 #define DIGI_OUT_BUF_SIZE 8
39
40 /* port input buffer length -- must be >= transfer buffer length - 3 */
41 /* so we can be sure to hold at least one full buffer from one urb */
42 #define DIGI_IN_BUF_SIZE 64
43
44 /* retry timeout while sleeping */
45 #define DIGI_RETRY_TIMEOUT (HZ/10)
46
47 /* timeout while waiting for tty output to drain in close */
48 /* this delay is used twice in close, so the total delay could */
49 /* be twice this value */
50 #define DIGI_CLOSE_TIMEOUT (5*HZ)
51
52
53 /* AccelePort USB Defines */
54
55 /* ids */
56 #define DIGI_VENDOR_ID 0x05c5
57 #define DIGI_2_ID 0x0002 /* USB-2 */
58 #define DIGI_4_ID 0x0004 /* USB-4 */
59
60 /* commands
61 * "INB": can be used on the in-band endpoint
62 * "OOB": can be used on the out-of-band endpoint
63 */
64 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
65 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
66 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
67 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
68 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
69 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
70 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
71 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
72 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
73 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
74 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
75 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
76 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
77 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
78 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
79 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
80 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
81 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
82 #define DIGI_CMD_SEND_DATA 18 /* INB */
83 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
84 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
85 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
86
87 /* baud rates */
88 #define DIGI_BAUD_50 0
89 #define DIGI_BAUD_75 1
90 #define DIGI_BAUD_110 2
91 #define DIGI_BAUD_150 3
92 #define DIGI_BAUD_200 4
93 #define DIGI_BAUD_300 5
94 #define DIGI_BAUD_600 6
95 #define DIGI_BAUD_1200 7
96 #define DIGI_BAUD_1800 8
97 #define DIGI_BAUD_2400 9
98 #define DIGI_BAUD_4800 10
99 #define DIGI_BAUD_7200 11
100 #define DIGI_BAUD_9600 12
101 #define DIGI_BAUD_14400 13
102 #define DIGI_BAUD_19200 14
103 #define DIGI_BAUD_28800 15
104 #define DIGI_BAUD_38400 16
105 #define DIGI_BAUD_57600 17
106 #define DIGI_BAUD_76800 18
107 #define DIGI_BAUD_115200 19
108 #define DIGI_BAUD_153600 20
109 #define DIGI_BAUD_230400 21
110 #define DIGI_BAUD_460800 22
111
112 /* arguments */
113 #define DIGI_WORD_SIZE_5 0
114 #define DIGI_WORD_SIZE_6 1
115 #define DIGI_WORD_SIZE_7 2
116 #define DIGI_WORD_SIZE_8 3
117
118 #define DIGI_PARITY_NONE 0
119 #define DIGI_PARITY_ODD 1
120 #define DIGI_PARITY_EVEN 2
121 #define DIGI_PARITY_MARK 3
122 #define DIGI_PARITY_SPACE 4
123
124 #define DIGI_STOP_BITS_1 0
125 #define DIGI_STOP_BITS_2 1
126
127 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
128 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
129 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
130
131 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
132 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
133 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
134
135 #define DIGI_DTR_INACTIVE 0
136 #define DIGI_DTR_ACTIVE 1
137 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
138
139 #define DIGI_RTS_INACTIVE 0
140 #define DIGI_RTS_ACTIVE 1
141 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
142 #define DIGI_RTS_TOGGLE 3
143
144 #define DIGI_FLUSH_TX 1
145 #define DIGI_FLUSH_RX 2
146 #define DIGI_RESUME_TX 4 /* clears xoff condition */
147
148 #define DIGI_TRANSMIT_NOT_IDLE 0
149 #define DIGI_TRANSMIT_IDLE 1
150
151 #define DIGI_DISABLE 0
152 #define DIGI_ENABLE 1
153
154 #define DIGI_DEASSERT 0
155 #define DIGI_ASSERT 1
156
157 /* in band status codes */
158 #define DIGI_OVERRUN_ERROR 4
159 #define DIGI_PARITY_ERROR 8
160 #define DIGI_FRAMING_ERROR 16
161 #define DIGI_BREAK_ERROR 32
162
163 /* out of band status */
164 #define DIGI_NO_ERROR 0
165 #define DIGI_BAD_FIRST_PARAMETER 1
166 #define DIGI_BAD_SECOND_PARAMETER 2
167 #define DIGI_INVALID_LINE 3
168 #define DIGI_INVALID_OPCODE 4
169
170 /* input signals */
171 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
172 #define DIGI_READ_INPUT_SIGNALS_ERR 2
173 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
174 #define DIGI_READ_INPUT_SIGNALS_PE 8
175 #define DIGI_READ_INPUT_SIGNALS_CTS 16
176 #define DIGI_READ_INPUT_SIGNALS_DSR 32
177 #define DIGI_READ_INPUT_SIGNALS_RI 64
178 #define DIGI_READ_INPUT_SIGNALS_DCD 128
179
180
181 /* Structures */
182
183 struct digi_serial {
184 spinlock_t ds_serial_lock;
185 struct usb_serial_port *ds_oob_port; /* out-of-band port */
186 int ds_oob_port_num; /* index of out-of-band port */
187 int ds_device_started;
188 };
189
190 struct digi_port {
191 spinlock_t dp_port_lock;
192 int dp_port_num;
193 int dp_out_buf_len;
194 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
195 int dp_write_urb_in_use;
196 unsigned int dp_modem_signals;
197 int dp_transmit_idle;
198 wait_queue_head_t dp_transmit_idle_wait;
199 int dp_throttled;
200 int dp_throttle_restart;
201 wait_queue_head_t dp_flush_wait;
202 wait_queue_head_t dp_close_wait; /* wait queue for close */
203 struct usb_serial_port *dp_port;
204 };
205
206
207 /* Local Function Declarations */
208
209 static int digi_write_oob_command(struct usb_serial_port *port,
210 unsigned char *buf, int count, int interruptible);
211 static int digi_write_inb_command(struct usb_serial_port *port,
212 unsigned char *buf, int count, unsigned long timeout);
213 static int digi_set_modem_signals(struct usb_serial_port *port,
214 unsigned int modem_signals, int interruptible);
215 static int digi_transmit_idle(struct usb_serial_port *port,
216 unsigned long timeout);
217 static void digi_rx_throttle(struct tty_struct *tty);
218 static void digi_rx_unthrottle(struct tty_struct *tty);
219 static void digi_set_termios(struct tty_struct *tty,
220 struct usb_serial_port *port, struct ktermios *old_termios);
221 static void digi_break_ctl(struct tty_struct *tty, int break_state);
222 static int digi_tiocmget(struct tty_struct *tty);
223 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
224 unsigned int clear);
225 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
226 const unsigned char *buf, int count);
227 static void digi_write_bulk_callback(struct urb *urb);
228 static int digi_write_room(struct tty_struct *tty);
229 static int digi_chars_in_buffer(struct tty_struct *tty);
230 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
231 static void digi_close(struct usb_serial_port *port);
232 static void digi_dtr_rts(struct usb_serial_port *port, int on);
233 static int digi_startup_device(struct usb_serial *serial);
234 static int digi_startup(struct usb_serial *serial);
235 static void digi_disconnect(struct usb_serial *serial);
236 static void digi_release(struct usb_serial *serial);
237 static int digi_port_probe(struct usb_serial_port *port);
238 static int digi_port_remove(struct usb_serial_port *port);
239 static void digi_read_bulk_callback(struct urb *urb);
240 static int digi_read_inb_callback(struct urb *urb);
241 static int digi_read_oob_callback(struct urb *urb);
242
243
244 static const struct usb_device_id id_table_combined[] = {
245 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
246 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
247 { } /* Terminating entry */
248 };
249
250 static const struct usb_device_id id_table_2[] = {
251 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
252 { } /* Terminating entry */
253 };
254
255 static const struct usb_device_id id_table_4[] = {
256 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
257 { } /* Terminating entry */
258 };
259
260 MODULE_DEVICE_TABLE(usb, id_table_combined);
261
262 /* device info needed for the Digi serial converter */
263
264 static struct usb_serial_driver digi_acceleport_2_device = {
265 .driver = {
266 .owner = THIS_MODULE,
267 .name = "digi_2",
268 },
269 .description = "Digi 2 port USB adapter",
270 .id_table = id_table_2,
271 .num_ports = 3,
272 .open = digi_open,
273 .close = digi_close,
274 .dtr_rts = digi_dtr_rts,
275 .write = digi_write,
276 .write_room = digi_write_room,
277 .write_bulk_callback = digi_write_bulk_callback,
278 .read_bulk_callback = digi_read_bulk_callback,
279 .chars_in_buffer = digi_chars_in_buffer,
280 .throttle = digi_rx_throttle,
281 .unthrottle = digi_rx_unthrottle,
282 .set_termios = digi_set_termios,
283 .break_ctl = digi_break_ctl,
284 .tiocmget = digi_tiocmget,
285 .tiocmset = digi_tiocmset,
286 .attach = digi_startup,
287 .disconnect = digi_disconnect,
288 .release = digi_release,
289 .port_probe = digi_port_probe,
290 .port_remove = digi_port_remove,
291 };
292
293 static struct usb_serial_driver digi_acceleport_4_device = {
294 .driver = {
295 .owner = THIS_MODULE,
296 .name = "digi_4",
297 },
298 .description = "Digi 4 port USB adapter",
299 .id_table = id_table_4,
300 .num_ports = 4,
301 .open = digi_open,
302 .close = digi_close,
303 .write = digi_write,
304 .write_room = digi_write_room,
305 .write_bulk_callback = digi_write_bulk_callback,
306 .read_bulk_callback = digi_read_bulk_callback,
307 .chars_in_buffer = digi_chars_in_buffer,
308 .throttle = digi_rx_throttle,
309 .unthrottle = digi_rx_unthrottle,
310 .set_termios = digi_set_termios,
311 .break_ctl = digi_break_ctl,
312 .tiocmget = digi_tiocmget,
313 .tiocmset = digi_tiocmset,
314 .attach = digi_startup,
315 .disconnect = digi_disconnect,
316 .release = digi_release,
317 .port_probe = digi_port_probe,
318 .port_remove = digi_port_remove,
319 };
320
321 static struct usb_serial_driver * const serial_drivers[] = {
322 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
323 };
324
325 /* Functions */
326
327 /*
328 * Cond Wait Interruptible Timeout Irqrestore
329 *
330 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
331 * so that wake ups are not lost if they occur between the unlock
332 * and the sleep. In other words, spin_unlock_irqrestore and
333 * interruptible_sleep_on_timeout are "atomic" with respect to
334 * wake ups. This is used to implement condition variables.
335 *
336 * interruptible_sleep_on_timeout is deprecated and has been replaced
337 * with the equivalent code.
338 */
339
340 static long cond_wait_interruptible_timeout_irqrestore(
341 wait_queue_head_t *q, long timeout,
342 spinlock_t *lock, unsigned long flags)
343 __releases(lock)
344 {
345 DEFINE_WAIT(wait);
346
347 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
348 spin_unlock_irqrestore(lock, flags);
349 timeout = schedule_timeout(timeout);
350 finish_wait(q, &wait);
351
352 return timeout;
353 }
354
355 /*
356 * Digi Write OOB Command
357 *
358 * Write commands on the out of band port. Commands are 4
359 * bytes each, multiple commands can be sent at once, and
360 * no command will be split across USB packets. Returns 0
361 * if successful, -EINTR if interrupted while sleeping and
362 * the interruptible flag is true, or a negative error
363 * returned by usb_submit_urb.
364 */
365
366 static int digi_write_oob_command(struct usb_serial_port *port,
367 unsigned char *buf, int count, int interruptible)
368 {
369 int ret = 0;
370 int len;
371 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
372 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
373 unsigned long flags = 0;
374
375 dev_dbg(&port->dev,
376 "digi_write_oob_command: TOP: port=%d, count=%d\n",
377 oob_priv->dp_port_num, count);
378
379 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
380 while (count > 0) {
381 while (oob_priv->dp_write_urb_in_use) {
382 cond_wait_interruptible_timeout_irqrestore(
383 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
384 &oob_priv->dp_port_lock, flags);
385 if (interruptible && signal_pending(current))
386 return -EINTR;
387 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
388 }
389
390 /* len must be a multiple of 4, so commands are not split */
391 len = min(count, oob_port->bulk_out_size);
392 if (len > 4)
393 len &= ~3;
394 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
395 oob_port->write_urb->transfer_buffer_length = len;
396 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
397 if (ret == 0) {
398 oob_priv->dp_write_urb_in_use = 1;
399 count -= len;
400 buf += len;
401 }
402 }
403 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
404 if (ret)
405 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
406 __func__, ret);
407 return ret;
408
409 }
410
411
412 /*
413 * Digi Write In Band Command
414 *
415 * Write commands on the given port. Commands are 4
416 * bytes each, multiple commands can be sent at once, and
417 * no command will be split across USB packets. If timeout
418 * is non-zero, write in band command will return after
419 * waiting unsuccessfully for the URB status to clear for
420 * timeout ticks. Returns 0 if successful, or a negative
421 * error returned by digi_write.
422 */
423
424 static int digi_write_inb_command(struct usb_serial_port *port,
425 unsigned char *buf, int count, unsigned long timeout)
426 {
427 int ret = 0;
428 int len;
429 struct digi_port *priv = usb_get_serial_port_data(port);
430 unsigned char *data = port->write_urb->transfer_buffer;
431 unsigned long flags = 0;
432
433 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
434 priv->dp_port_num, count);
435
436 if (timeout)
437 timeout += jiffies;
438 else
439 timeout = ULONG_MAX;
440
441 spin_lock_irqsave(&priv->dp_port_lock, flags);
442 while (count > 0 && ret == 0) {
443 while (priv->dp_write_urb_in_use &&
444 time_before(jiffies, timeout)) {
445 cond_wait_interruptible_timeout_irqrestore(
446 &port->write_wait, DIGI_RETRY_TIMEOUT,
447 &priv->dp_port_lock, flags);
448 if (signal_pending(current))
449 return -EINTR;
450 spin_lock_irqsave(&priv->dp_port_lock, flags);
451 }
452
453 /* len must be a multiple of 4 and small enough to */
454 /* guarantee the write will send buffered data first, */
455 /* so commands are in order with data and not split */
456 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
457 if (len > 4)
458 len &= ~3;
459
460 /* write any buffered data first */
461 if (priv->dp_out_buf_len > 0) {
462 data[0] = DIGI_CMD_SEND_DATA;
463 data[1] = priv->dp_out_buf_len;
464 memcpy(data + 2, priv->dp_out_buf,
465 priv->dp_out_buf_len);
466 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
467 port->write_urb->transfer_buffer_length
468 = priv->dp_out_buf_len + 2 + len;
469 } else {
470 memcpy(data, buf, len);
471 port->write_urb->transfer_buffer_length = len;
472 }
473
474 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
475 if (ret == 0) {
476 priv->dp_write_urb_in_use = 1;
477 priv->dp_out_buf_len = 0;
478 count -= len;
479 buf += len;
480 }
481
482 }
483 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
484
485 if (ret)
486 dev_err(&port->dev,
487 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
488 __func__, ret, priv->dp_port_num);
489 return ret;
490 }
491
492
493 /*
494 * Digi Set Modem Signals
495 *
496 * Sets or clears DTR and RTS on the port, according to the
497 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
498 * for the modem_signals argument. Returns 0 if successful,
499 * -EINTR if interrupted while sleeping, or a non-zero error
500 * returned by usb_submit_urb.
501 */
502
503 static int digi_set_modem_signals(struct usb_serial_port *port,
504 unsigned int modem_signals, int interruptible)
505 {
506
507 int ret;
508 struct digi_port *port_priv = usb_get_serial_port_data(port);
509 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
510 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
511 unsigned char *data = oob_port->write_urb->transfer_buffer;
512 unsigned long flags = 0;
513
514
515 dev_dbg(&port->dev,
516 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
517 port_priv->dp_port_num, modem_signals);
518
519 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
520 spin_lock(&port_priv->dp_port_lock);
521
522 while (oob_priv->dp_write_urb_in_use) {
523 spin_unlock(&port_priv->dp_port_lock);
524 cond_wait_interruptible_timeout_irqrestore(
525 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
526 &oob_priv->dp_port_lock, flags);
527 if (interruptible && signal_pending(current))
528 return -EINTR;
529 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
530 spin_lock(&port_priv->dp_port_lock);
531 }
532 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
533 data[1] = port_priv->dp_port_num;
534 data[2] = (modem_signals & TIOCM_DTR) ?
535 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
536 data[3] = 0;
537 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
538 data[5] = port_priv->dp_port_num;
539 data[6] = (modem_signals & TIOCM_RTS) ?
540 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
541 data[7] = 0;
542
543 oob_port->write_urb->transfer_buffer_length = 8;
544
545 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
546 if (ret == 0) {
547 oob_priv->dp_write_urb_in_use = 1;
548 port_priv->dp_modem_signals =
549 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
550 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
551 }
552 spin_unlock(&port_priv->dp_port_lock);
553 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
554 if (ret)
555 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
556 __func__, ret);
557 return ret;
558 }
559
560 /*
561 * Digi Transmit Idle
562 *
563 * Digi transmit idle waits, up to timeout ticks, for the transmitter
564 * to go idle. It returns 0 if successful or a negative error.
565 *
566 * There are race conditions here if more than one process is calling
567 * digi_transmit_idle on the same port at the same time. However, this
568 * is only called from close, and only one process can be in close on a
569 * port at a time, so its ok.
570 */
571
572 static int digi_transmit_idle(struct usb_serial_port *port,
573 unsigned long timeout)
574 {
575 int ret;
576 unsigned char buf[2];
577 struct digi_port *priv = usb_get_serial_port_data(port);
578 unsigned long flags = 0;
579
580 spin_lock_irqsave(&priv->dp_port_lock, flags);
581 priv->dp_transmit_idle = 0;
582 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
583
584 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
585 buf[1] = 0;
586
587 timeout += jiffies;
588
589 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
590 if (ret != 0)
591 return ret;
592
593 spin_lock_irqsave(&priv->dp_port_lock, flags);
594
595 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
596 cond_wait_interruptible_timeout_irqrestore(
597 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
598 &priv->dp_port_lock, flags);
599 if (signal_pending(current))
600 return -EINTR;
601 spin_lock_irqsave(&priv->dp_port_lock, flags);
602 }
603 priv->dp_transmit_idle = 0;
604 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
605 return 0;
606
607 }
608
609
610 static void digi_rx_throttle(struct tty_struct *tty)
611 {
612 unsigned long flags;
613 struct usb_serial_port *port = tty->driver_data;
614 struct digi_port *priv = usb_get_serial_port_data(port);
615
616 /* stop receiving characters by not resubmitting the read urb */
617 spin_lock_irqsave(&priv->dp_port_lock, flags);
618 priv->dp_throttled = 1;
619 priv->dp_throttle_restart = 0;
620 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
621 }
622
623
624 static void digi_rx_unthrottle(struct tty_struct *tty)
625 {
626 int ret = 0;
627 unsigned long flags;
628 struct usb_serial_port *port = tty->driver_data;
629 struct digi_port *priv = usb_get_serial_port_data(port);
630
631 spin_lock_irqsave(&priv->dp_port_lock, flags);
632
633 /* restart read chain */
634 if (priv->dp_throttle_restart)
635 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
636
637 /* turn throttle off */
638 priv->dp_throttled = 0;
639 priv->dp_throttle_restart = 0;
640
641 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
642
643 if (ret)
644 dev_err(&port->dev,
645 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
646 __func__, ret, priv->dp_port_num);
647 }
648
649
650 static void digi_set_termios(struct tty_struct *tty,
651 struct usb_serial_port *port, struct ktermios *old_termios)
652 {
653 struct digi_port *priv = usb_get_serial_port_data(port);
654 struct device *dev = &port->dev;
655 unsigned int iflag = tty->termios.c_iflag;
656 unsigned int cflag = tty->termios.c_cflag;
657 unsigned int old_iflag = old_termios->c_iflag;
658 unsigned int old_cflag = old_termios->c_cflag;
659 unsigned char buf[32];
660 unsigned int modem_signals;
661 int arg, ret;
662 int i = 0;
663 speed_t baud;
664
665 dev_dbg(dev,
666 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
667 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
668
669 /* set baud rate */
670 baud = tty_get_baud_rate(tty);
671 if (baud != tty_termios_baud_rate(old_termios)) {
672 arg = -1;
673
674 /* reassert DTR and (maybe) RTS on transition from B0 */
675 if ((old_cflag & CBAUD) == B0) {
676 /* don't set RTS if using hardware flow control */
677 /* and throttling input */
678 modem_signals = TIOCM_DTR;
679 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
680 modem_signals |= TIOCM_RTS;
681 digi_set_modem_signals(port, modem_signals, 1);
682 }
683 switch (baud) {
684 /* drop DTR and RTS on transition to B0 */
685 case 0: digi_set_modem_signals(port, 0, 1); break;
686 case 50: arg = DIGI_BAUD_50; break;
687 case 75: arg = DIGI_BAUD_75; break;
688 case 110: arg = DIGI_BAUD_110; break;
689 case 150: arg = DIGI_BAUD_150; break;
690 case 200: arg = DIGI_BAUD_200; break;
691 case 300: arg = DIGI_BAUD_300; break;
692 case 600: arg = DIGI_BAUD_600; break;
693 case 1200: arg = DIGI_BAUD_1200; break;
694 case 1800: arg = DIGI_BAUD_1800; break;
695 case 2400: arg = DIGI_BAUD_2400; break;
696 case 4800: arg = DIGI_BAUD_4800; break;
697 case 9600: arg = DIGI_BAUD_9600; break;
698 case 19200: arg = DIGI_BAUD_19200; break;
699 case 38400: arg = DIGI_BAUD_38400; break;
700 case 57600: arg = DIGI_BAUD_57600; break;
701 case 115200: arg = DIGI_BAUD_115200; break;
702 case 230400: arg = DIGI_BAUD_230400; break;
703 case 460800: arg = DIGI_BAUD_460800; break;
704 default:
705 arg = DIGI_BAUD_9600;
706 baud = 9600;
707 break;
708 }
709 if (arg != -1) {
710 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
711 buf[i++] = priv->dp_port_num;
712 buf[i++] = arg;
713 buf[i++] = 0;
714 }
715 }
716 /* set parity */
717 tty->termios.c_cflag &= ~CMSPAR;
718
719 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
720 if (cflag&PARENB) {
721 if (cflag&PARODD)
722 arg = DIGI_PARITY_ODD;
723 else
724 arg = DIGI_PARITY_EVEN;
725 } else {
726 arg = DIGI_PARITY_NONE;
727 }
728 buf[i++] = DIGI_CMD_SET_PARITY;
729 buf[i++] = priv->dp_port_num;
730 buf[i++] = arg;
731 buf[i++] = 0;
732 }
733 /* set word size */
734 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
735 arg = -1;
736 switch (cflag&CSIZE) {
737 case CS5: arg = DIGI_WORD_SIZE_5; break;
738 case CS6: arg = DIGI_WORD_SIZE_6; break;
739 case CS7: arg = DIGI_WORD_SIZE_7; break;
740 case CS8: arg = DIGI_WORD_SIZE_8; break;
741 default:
742 dev_dbg(dev,
743 "digi_set_termios: can't handle word size %d\n",
744 (cflag&CSIZE));
745 break;
746 }
747
748 if (arg != -1) {
749 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
750 buf[i++] = priv->dp_port_num;
751 buf[i++] = arg;
752 buf[i++] = 0;
753 }
754
755 }
756
757 /* set stop bits */
758 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
759
760 if ((cflag&CSTOPB))
761 arg = DIGI_STOP_BITS_2;
762 else
763 arg = DIGI_STOP_BITS_1;
764
765 buf[i++] = DIGI_CMD_SET_STOP_BITS;
766 buf[i++] = priv->dp_port_num;
767 buf[i++] = arg;
768 buf[i++] = 0;
769
770 }
771
772 /* set input flow control */
773 if ((iflag&IXOFF) != (old_iflag&IXOFF)
774 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
775 arg = 0;
776 if (iflag&IXOFF)
777 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
778 else
779 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
780
781 if (cflag&CRTSCTS) {
782 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
783
784 /* On USB-4 it is necessary to assert RTS prior */
785 /* to selecting RTS input flow control. */
786 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
787 buf[i++] = priv->dp_port_num;
788 buf[i++] = DIGI_RTS_ACTIVE;
789 buf[i++] = 0;
790
791 } else {
792 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
793 }
794 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
795 buf[i++] = priv->dp_port_num;
796 buf[i++] = arg;
797 buf[i++] = 0;
798 }
799
800 /* set output flow control */
801 if ((iflag & IXON) != (old_iflag & IXON)
802 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
803 arg = 0;
804 if (iflag & IXON)
805 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
806 else
807 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
808
809 if (cflag & CRTSCTS) {
810 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
811 } else {
812 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
813 }
814
815 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
816 buf[i++] = priv->dp_port_num;
817 buf[i++] = arg;
818 buf[i++] = 0;
819 }
820
821 /* set receive enable/disable */
822 if ((cflag & CREAD) != (old_cflag & CREAD)) {
823 if (cflag & CREAD)
824 arg = DIGI_ENABLE;
825 else
826 arg = DIGI_DISABLE;
827
828 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
829 buf[i++] = priv->dp_port_num;
830 buf[i++] = arg;
831 buf[i++] = 0;
832 }
833 ret = digi_write_oob_command(port, buf, i, 1);
834 if (ret != 0)
835 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
836 tty_encode_baud_rate(tty, baud, baud);
837 }
838
839
840 static void digi_break_ctl(struct tty_struct *tty, int break_state)
841 {
842 struct usb_serial_port *port = tty->driver_data;
843 unsigned char buf[4];
844
845 buf[0] = DIGI_CMD_BREAK_CONTROL;
846 buf[1] = 2; /* length */
847 buf[2] = break_state ? 1 : 0;
848 buf[3] = 0; /* pad */
849 digi_write_inb_command(port, buf, 4, 0);
850 }
851
852
853 static int digi_tiocmget(struct tty_struct *tty)
854 {
855 struct usb_serial_port *port = tty->driver_data;
856 struct digi_port *priv = usb_get_serial_port_data(port);
857 unsigned int val;
858 unsigned long flags;
859
860 spin_lock_irqsave(&priv->dp_port_lock, flags);
861 val = priv->dp_modem_signals;
862 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
863 return val;
864 }
865
866
867 static int digi_tiocmset(struct tty_struct *tty,
868 unsigned int set, unsigned int clear)
869 {
870 struct usb_serial_port *port = tty->driver_data;
871 struct digi_port *priv = usb_get_serial_port_data(port);
872 unsigned int val;
873 unsigned long flags;
874
875 spin_lock_irqsave(&priv->dp_port_lock, flags);
876 val = (priv->dp_modem_signals & ~clear) | set;
877 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
878 return digi_set_modem_signals(port, val, 1);
879 }
880
881
882 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
883 const unsigned char *buf, int count)
884 {
885
886 int ret, data_len, new_len;
887 struct digi_port *priv = usb_get_serial_port_data(port);
888 unsigned char *data = port->write_urb->transfer_buffer;
889 unsigned long flags = 0;
890
891 dev_dbg(&port->dev,
892 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
893 priv->dp_port_num, count, in_interrupt());
894
895 /* copy user data (which can sleep) before getting spin lock */
896 count = min(count, port->bulk_out_size-2);
897 count = min(64, count);
898
899 /* be sure only one write proceeds at a time */
900 /* there are races on the port private buffer */
901 spin_lock_irqsave(&priv->dp_port_lock, flags);
902
903 /* wait for urb status clear to submit another urb */
904 if (priv->dp_write_urb_in_use) {
905 /* buffer data if count is 1 (probably put_char) if possible */
906 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
907 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
908 new_len = 1;
909 } else {
910 new_len = 0;
911 }
912 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
913 return new_len;
914 }
915
916 /* allow space for any buffered data and for new data, up to */
917 /* transfer buffer size - 2 (for command and length bytes) */
918 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
919 data_len = new_len + priv->dp_out_buf_len;
920
921 if (data_len == 0) {
922 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
923 return 0;
924 }
925
926 port->write_urb->transfer_buffer_length = data_len+2;
927
928 *data++ = DIGI_CMD_SEND_DATA;
929 *data++ = data_len;
930
931 /* copy in buffered data first */
932 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
933 data += priv->dp_out_buf_len;
934
935 /* copy in new data */
936 memcpy(data, buf, new_len);
937
938 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
939 if (ret == 0) {
940 priv->dp_write_urb_in_use = 1;
941 ret = new_len;
942 priv->dp_out_buf_len = 0;
943 }
944
945 /* return length of new data written, or error */
946 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
947 if (ret < 0)
948 dev_err_console(port,
949 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
950 __func__, ret, priv->dp_port_num);
951 dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
952 return ret;
953
954 }
955
956 static void digi_write_bulk_callback(struct urb *urb)
957 {
958
959 struct usb_serial_port *port = urb->context;
960 struct usb_serial *serial;
961 struct digi_port *priv;
962 struct digi_serial *serial_priv;
963 int ret = 0;
964 int status = urb->status;
965 bool wakeup;
966
967 /* port and serial sanity check */
968 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
969 pr_err("%s: port or port->private is NULL, status=%d\n",
970 __func__, status);
971 return;
972 }
973 serial = port->serial;
974 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
975 dev_err(&port->dev,
976 "%s: serial or serial->private is NULL, status=%d\n",
977 __func__, status);
978 return;
979 }
980
981 /* handle oob callback */
982 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
983 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
984 spin_lock(&priv->dp_port_lock);
985 priv->dp_write_urb_in_use = 0;
986 wake_up_interruptible(&port->write_wait);
987 spin_unlock(&priv->dp_port_lock);
988 return;
989 }
990
991 /* try to send any buffered data on this port */
992 wakeup = true;
993 spin_lock(&priv->dp_port_lock);
994 priv->dp_write_urb_in_use = 0;
995 if (priv->dp_out_buf_len > 0) {
996 *((unsigned char *)(port->write_urb->transfer_buffer))
997 = (unsigned char)DIGI_CMD_SEND_DATA;
998 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
999 = (unsigned char)priv->dp_out_buf_len;
1000 port->write_urb->transfer_buffer_length =
1001 priv->dp_out_buf_len + 2;
1002 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1003 priv->dp_out_buf_len);
1004 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1005 if (ret == 0) {
1006 priv->dp_write_urb_in_use = 1;
1007 priv->dp_out_buf_len = 0;
1008 wakeup = false;
1009 }
1010 }
1011 spin_unlock(&priv->dp_port_lock);
1012
1013 if (ret && ret != -EPERM)
1014 dev_err_console(port,
1015 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1016 __func__, ret, priv->dp_port_num);
1017
1018 if (wakeup)
1019 tty_port_tty_wakeup(&port->port);
1020 }
1021
1022 static int digi_write_room(struct tty_struct *tty)
1023 {
1024 struct usb_serial_port *port = tty->driver_data;
1025 struct digi_port *priv = usb_get_serial_port_data(port);
1026 int room;
1027 unsigned long flags = 0;
1028
1029 spin_lock_irqsave(&priv->dp_port_lock, flags);
1030
1031 if (priv->dp_write_urb_in_use)
1032 room = 0;
1033 else
1034 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1035
1036 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1037 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
1038 return room;
1039
1040 }
1041
1042 static int digi_chars_in_buffer(struct tty_struct *tty)
1043 {
1044 struct usb_serial_port *port = tty->driver_data;
1045 struct digi_port *priv = usb_get_serial_port_data(port);
1046
1047 if (priv->dp_write_urb_in_use) {
1048 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1049 priv->dp_port_num, port->bulk_out_size - 2);
1050 /* return(port->bulk_out_size - 2); */
1051 return 256;
1052 } else {
1053 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1054 priv->dp_port_num, priv->dp_out_buf_len);
1055 return priv->dp_out_buf_len;
1056 }
1057
1058 }
1059
1060 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1061 {
1062 /* Adjust DTR and RTS */
1063 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1064 }
1065
1066 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1067 {
1068 int ret;
1069 unsigned char buf[32];
1070 struct digi_port *priv = usb_get_serial_port_data(port);
1071 struct ktermios not_termios;
1072
1073 /* be sure the device is started up */
1074 if (digi_startup_device(port->serial) != 0)
1075 return -ENXIO;
1076
1077 /* read modem signals automatically whenever they change */
1078 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1079 buf[1] = priv->dp_port_num;
1080 buf[2] = DIGI_ENABLE;
1081 buf[3] = 0;
1082
1083 /* flush fifos */
1084 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1085 buf[5] = priv->dp_port_num;
1086 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1087 buf[7] = 0;
1088
1089 ret = digi_write_oob_command(port, buf, 8, 1);
1090 if (ret != 0)
1091 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1092
1093 /* set termios settings */
1094 if (tty) {
1095 not_termios.c_cflag = ~tty->termios.c_cflag;
1096 not_termios.c_iflag = ~tty->termios.c_iflag;
1097 digi_set_termios(tty, port, &not_termios);
1098 }
1099 return 0;
1100 }
1101
1102
1103 static void digi_close(struct usb_serial_port *port)
1104 {
1105 DEFINE_WAIT(wait);
1106 int ret;
1107 unsigned char buf[32];
1108 struct digi_port *priv = usb_get_serial_port_data(port);
1109
1110 mutex_lock(&port->serial->disc_mutex);
1111 /* if disconnected, just clear flags */
1112 if (port->serial->disconnected)
1113 goto exit;
1114
1115 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1116 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1117
1118 /* disable input flow control */
1119 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1120 buf[1] = priv->dp_port_num;
1121 buf[2] = DIGI_DISABLE;
1122 buf[3] = 0;
1123
1124 /* disable output flow control */
1125 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1126 buf[5] = priv->dp_port_num;
1127 buf[6] = DIGI_DISABLE;
1128 buf[7] = 0;
1129
1130 /* disable reading modem signals automatically */
1131 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1132 buf[9] = priv->dp_port_num;
1133 buf[10] = DIGI_DISABLE;
1134 buf[11] = 0;
1135
1136 /* disable receive */
1137 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1138 buf[13] = priv->dp_port_num;
1139 buf[14] = DIGI_DISABLE;
1140 buf[15] = 0;
1141
1142 /* flush fifos */
1143 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1144 buf[17] = priv->dp_port_num;
1145 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1146 buf[19] = 0;
1147
1148 ret = digi_write_oob_command(port, buf, 20, 0);
1149 if (ret != 0)
1150 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",
1151 ret);
1152 /* wait for final commands on oob port to complete */
1153 prepare_to_wait(&priv->dp_flush_wait, &wait,
1154 TASK_INTERRUPTIBLE);
1155 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1156 finish_wait(&priv->dp_flush_wait, &wait);
1157
1158 /* shutdown any outstanding bulk writes */
1159 usb_kill_urb(port->write_urb);
1160 exit:
1161 spin_lock_irq(&priv->dp_port_lock);
1162 priv->dp_write_urb_in_use = 0;
1163 wake_up_interruptible(&priv->dp_close_wait);
1164 spin_unlock_irq(&priv->dp_port_lock);
1165 mutex_unlock(&port->serial->disc_mutex);
1166 }
1167
1168
1169 /*
1170 * Digi Startup Device
1171 *
1172 * Starts reads on all ports. Must be called AFTER startup, with
1173 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1174 */
1175
1176 static int digi_startup_device(struct usb_serial *serial)
1177 {
1178 int i, ret = 0;
1179 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1180 struct usb_serial_port *port;
1181
1182 /* be sure this happens exactly once */
1183 spin_lock(&serial_priv->ds_serial_lock);
1184 if (serial_priv->ds_device_started) {
1185 spin_unlock(&serial_priv->ds_serial_lock);
1186 return 0;
1187 }
1188 serial_priv->ds_device_started = 1;
1189 spin_unlock(&serial_priv->ds_serial_lock);
1190
1191 /* start reading from each bulk in endpoint for the device */
1192 /* set USB_DISABLE_SPD flag for write bulk urbs */
1193 for (i = 0; i < serial->type->num_ports + 1; i++) {
1194 port = serial->port[i];
1195 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1196 if (ret != 0) {
1197 dev_err(&port->dev,
1198 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1199 __func__, ret, i);
1200 break;
1201 }
1202 }
1203 return ret;
1204 }
1205
1206 static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1207 {
1208 struct digi_port *priv;
1209
1210 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1211 if (!priv)
1212 return -ENOMEM;
1213
1214 spin_lock_init(&priv->dp_port_lock);
1215 priv->dp_port_num = port_num;
1216 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1217 init_waitqueue_head(&priv->dp_flush_wait);
1218 init_waitqueue_head(&priv->dp_close_wait);
1219 priv->dp_port = port;
1220
1221 init_waitqueue_head(&port->write_wait);
1222
1223 usb_set_serial_port_data(port, priv);
1224
1225 return 0;
1226 }
1227
1228 static int digi_startup(struct usb_serial *serial)
1229 {
1230 struct device *dev = &serial->interface->dev;
1231 struct digi_serial *serial_priv;
1232 int ret;
1233 int i;
1234
1235 /* check whether the device has the expected number of endpoints */
1236 if (serial->num_port_pointers < serial->type->num_ports + 1) {
1237 dev_err(dev, "OOB endpoints missing\n");
1238 return -ENODEV;
1239 }
1240
1241 for (i = 0; i < serial->type->num_ports + 1 ; i++) {
1242 if (!serial->port[i]->read_urb) {
1243 dev_err(dev, "bulk-in endpoint missing\n");
1244 return -ENODEV;
1245 }
1246 if (!serial->port[i]->write_urb) {
1247 dev_err(dev, "bulk-out endpoint missing\n");
1248 return -ENODEV;
1249 }
1250 }
1251
1252 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1253 if (!serial_priv)
1254 return -ENOMEM;
1255
1256 spin_lock_init(&serial_priv->ds_serial_lock);
1257 serial_priv->ds_oob_port_num = serial->type->num_ports;
1258 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1259
1260 ret = digi_port_init(serial_priv->ds_oob_port,
1261 serial_priv->ds_oob_port_num);
1262 if (ret) {
1263 kfree(serial_priv);
1264 return ret;
1265 }
1266
1267 usb_set_serial_data(serial, serial_priv);
1268
1269 return 0;
1270 }
1271
1272
1273 static void digi_disconnect(struct usb_serial *serial)
1274 {
1275 int i;
1276
1277 /* stop reads and writes on all ports */
1278 for (i = 0; i < serial->type->num_ports + 1; i++) {
1279 usb_kill_urb(serial->port[i]->read_urb);
1280 usb_kill_urb(serial->port[i]->write_urb);
1281 }
1282 }
1283
1284
1285 static void digi_release(struct usb_serial *serial)
1286 {
1287 struct digi_serial *serial_priv;
1288 struct digi_port *priv;
1289
1290 serial_priv = usb_get_serial_data(serial);
1291
1292 priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
1293 kfree(priv);
1294
1295 kfree(serial_priv);
1296 }
1297
1298 static int digi_port_probe(struct usb_serial_port *port)
1299 {
1300 return digi_port_init(port, port->port_number);
1301 }
1302
1303 static int digi_port_remove(struct usb_serial_port *port)
1304 {
1305 struct digi_port *priv;
1306
1307 priv = usb_get_serial_port_data(port);
1308 kfree(priv);
1309
1310 return 0;
1311 }
1312
1313 static void digi_read_bulk_callback(struct urb *urb)
1314 {
1315 struct usb_serial_port *port = urb->context;
1316 struct digi_port *priv;
1317 struct digi_serial *serial_priv;
1318 int ret;
1319 int status = urb->status;
1320
1321 /* port sanity check, do not resubmit if port is not valid */
1322 if (port == NULL)
1323 return;
1324 priv = usb_get_serial_port_data(port);
1325 if (priv == NULL) {
1326 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1327 __func__, status);
1328 return;
1329 }
1330 if (port->serial == NULL ||
1331 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1332 dev_err(&port->dev, "%s: serial is bad or serial->private "
1333 "is NULL, status=%d\n", __func__, status);
1334 return;
1335 }
1336
1337 /* do not resubmit urb if it has any status error */
1338 if (status) {
1339 dev_err(&port->dev,
1340 "%s: nonzero read bulk status: status=%d, port=%d\n",
1341 __func__, status, priv->dp_port_num);
1342 return;
1343 }
1344
1345 /* handle oob or inb callback, do not resubmit if error */
1346 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1347 if (digi_read_oob_callback(urb) != 0)
1348 return;
1349 } else {
1350 if (digi_read_inb_callback(urb) != 0)
1351 return;
1352 }
1353
1354 /* continue read */
1355 ret = usb_submit_urb(urb, GFP_ATOMIC);
1356 if (ret != 0 && ret != -EPERM) {
1357 dev_err(&port->dev,
1358 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1359 __func__, ret, priv->dp_port_num);
1360 }
1361
1362 }
1363
1364 /*
1365 * Digi Read INB Callback
1366 *
1367 * Digi Read INB Callback handles reads on the in band ports, sending
1368 * the data on to the tty subsystem. When called we know port and
1369 * port->private are not NULL and port->serial has been validated.
1370 * It returns 0 if successful, 1 if successful but the port is
1371 * throttled, and -1 if the sanity checks failed.
1372 */
1373
1374 static int digi_read_inb_callback(struct urb *urb)
1375 {
1376 struct usb_serial_port *port = urb->context;
1377 struct digi_port *priv = usb_get_serial_port_data(port);
1378 unsigned char *buf = urb->transfer_buffer;
1379 int opcode;
1380 int len;
1381 int port_status;
1382 unsigned char *data;
1383 int flag, throttled;
1384
1385 /* short/multiple packet check */
1386 if (urb->actual_length < 2) {
1387 dev_warn(&port->dev, "short packet received\n");
1388 return -1;
1389 }
1390
1391 opcode = buf[0];
1392 len = buf[1];
1393
1394 if (urb->actual_length != len + 2) {
1395 dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n",
1396 priv->dp_port_num, opcode, len, urb->actual_length);
1397 return -1;
1398 }
1399
1400 if (opcode == DIGI_CMD_RECEIVE_DATA && len < 1) {
1401 dev_err(&port->dev, "malformed data packet received\n");
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 port_status = buf[2];
1416 data = &buf[3];
1417
1418 /* get flag from port_status */
1419 flag = 0;
1420
1421 /* overrun is special, not associated with a char */
1422 if (port_status & DIGI_OVERRUN_ERROR)
1423 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1424
1425 /* break takes precedence over parity, */
1426 /* which takes precedence over framing errors */
1427 if (port_status & DIGI_BREAK_ERROR)
1428 flag = TTY_BREAK;
1429 else if (port_status & DIGI_PARITY_ERROR)
1430 flag = TTY_PARITY;
1431 else if (port_status & DIGI_FRAMING_ERROR)
1432 flag = TTY_FRAME;
1433
1434 /* data length is len-1 (one byte of len is port_status) */
1435 --len;
1436 if (len > 0) {
1437 tty_insert_flip_string_fixed_flag(&port->port, data,
1438 flag, len);
1439 tty_flip_buffer_push(&port->port);
1440 }
1441 }
1442 spin_unlock(&priv->dp_port_lock);
1443
1444 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1445 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1446 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1447 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1448
1449 return throttled ? 1 : 0;
1450
1451 }
1452
1453
1454 /*
1455 * Digi Read OOB Callback
1456 *
1457 * Digi Read OOB Callback handles reads on the out of band port.
1458 * When called we know port and port->private are not NULL and
1459 * the port->serial is valid. It returns 0 if successful, and
1460 * -1 if the sanity checks failed.
1461 */
1462
1463 static int digi_read_oob_callback(struct urb *urb)
1464 {
1465
1466 struct usb_serial_port *port = urb->context;
1467 struct usb_serial *serial = port->serial;
1468 struct tty_struct *tty;
1469 struct digi_port *priv = usb_get_serial_port_data(port);
1470 unsigned char *buf = urb->transfer_buffer;
1471 int opcode, line, status, val;
1472 int i;
1473 unsigned int rts;
1474
1475 if (urb->actual_length < 4)
1476 return -1;
1477
1478 /* handle each oob command */
1479 for (i = 0; i < urb->actual_length - 3; i += 4) {
1480 opcode = buf[i];
1481 line = buf[i + 1];
1482 status = buf[i + 2];
1483 val = buf[i + 3];
1484
1485 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1486 opcode, line, status, val);
1487
1488 if (status != 0 || line >= serial->type->num_ports)
1489 continue;
1490
1491 port = serial->port[line];
1492
1493 priv = usb_get_serial_port_data(port);
1494 if (priv == NULL)
1495 return -1;
1496
1497 tty = tty_port_tty_get(&port->port);
1498
1499 rts = 0;
1500 if (tty)
1501 rts = C_CRTSCTS(tty);
1502
1503 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1504 bool wakeup = false;
1505
1506 spin_lock(&priv->dp_port_lock);
1507 /* convert from digi flags to termiox flags */
1508 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1509 priv->dp_modem_signals |= TIOCM_CTS;
1510 if (rts)
1511 wakeup = true;
1512 } else {
1513 priv->dp_modem_signals &= ~TIOCM_CTS;
1514 /* port must be open to use tty struct */
1515 }
1516 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1517 priv->dp_modem_signals |= TIOCM_DSR;
1518 else
1519 priv->dp_modem_signals &= ~TIOCM_DSR;
1520 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1521 priv->dp_modem_signals |= TIOCM_RI;
1522 else
1523 priv->dp_modem_signals &= ~TIOCM_RI;
1524 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1525 priv->dp_modem_signals |= TIOCM_CD;
1526 else
1527 priv->dp_modem_signals &= ~TIOCM_CD;
1528
1529 spin_unlock(&priv->dp_port_lock);
1530
1531 if (wakeup)
1532 tty_port_tty_wakeup(&port->port);
1533 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1534 spin_lock(&priv->dp_port_lock);
1535 priv->dp_transmit_idle = 1;
1536 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1537 spin_unlock(&priv->dp_port_lock);
1538 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1539 wake_up_interruptible(&priv->dp_flush_wait);
1540 }
1541 tty_kref_put(tty);
1542 }
1543 return 0;
1544
1545 }
1546
1547 module_usb_serial_driver(serial_drivers, id_table_combined);
1548
1549 MODULE_AUTHOR(DRIVER_AUTHOR);
1550 MODULE_DESCRIPTION(DRIVER_DESC);
1551 MODULE_LICENSE("GPL");
Linux with added FPC-III support