2 * Digi AccelePort USB-4 and USB-2 Serial Converters
4 * Copyright 2000 by Digi International
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.
11 * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
14 * Peter Berger (pberger@brimson.com)
15 * Al Borchers (borchers@steinerpoint.com)
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/tty.h>
23 #include <linux/tty_driver.h>
24 #include <linux/tty_flip.h>
25 #include <linux/module.h>
26 #include <linux/spinlock.h>
27 #include <linux/workqueue.h>
28 #include <linux/uaccess.h>
29 #include <linux/usb.h>
30 #include <linux/wait.h>
31 #include <linux/usb/serial.h>
35 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
36 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
38 /* port output buffer length -- must be <= transfer buffer length - 2 */
39 /* so we can be sure to send the full buffer in one urb */
40 #define DIGI_OUT_BUF_SIZE 8
42 /* port input buffer length -- must be >= transfer buffer length - 3 */
43 /* so we can be sure to hold at least one full buffer from one urb */
44 #define DIGI_IN_BUF_SIZE 64
46 /* retry timeout while sleeping */
47 #define DIGI_RETRY_TIMEOUT (HZ/10)
49 /* timeout while waiting for tty output to drain in close */
50 /* this delay is used twice in close, so the total delay could */
51 /* be twice this value */
52 #define DIGI_CLOSE_TIMEOUT (5*HZ)
55 /* AccelePort USB Defines */
58 #define DIGI_VENDOR_ID 0x05c5
59 #define DIGI_2_ID 0x0002 /* USB-2 */
60 #define DIGI_4_ID 0x0004 /* USB-4 */
63 * "INB": can be used on the in-band endpoint
64 * "OOB": can be used on the out-of-band endpoint
66 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
67 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
68 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
69 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
70 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
71 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
72 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
73 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
74 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
75 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
76 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
77 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
78 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
79 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
80 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
81 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
82 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
83 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
84 #define DIGI_CMD_SEND_DATA 18 /* INB */
85 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
86 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
87 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
90 #define DIGI_BAUD_50 0
91 #define DIGI_BAUD_75 1
92 #define DIGI_BAUD_110 2
93 #define DIGI_BAUD_150 3
94 #define DIGI_BAUD_200 4
95 #define DIGI_BAUD_300 5
96 #define DIGI_BAUD_600 6
97 #define DIGI_BAUD_1200 7
98 #define DIGI_BAUD_1800 8
99 #define DIGI_BAUD_2400 9
100 #define DIGI_BAUD_4800 10
101 #define DIGI_BAUD_7200 11
102 #define DIGI_BAUD_9600 12
103 #define DIGI_BAUD_14400 13
104 #define DIGI_BAUD_19200 14
105 #define DIGI_BAUD_28800 15
106 #define DIGI_BAUD_38400 16
107 #define DIGI_BAUD_57600 17
108 #define DIGI_BAUD_76800 18
109 #define DIGI_BAUD_115200 19
110 #define DIGI_BAUD_153600 20
111 #define DIGI_BAUD_230400 21
112 #define DIGI_BAUD_460800 22
115 #define DIGI_WORD_SIZE_5 0
116 #define DIGI_WORD_SIZE_6 1
117 #define DIGI_WORD_SIZE_7 2
118 #define DIGI_WORD_SIZE_8 3
120 #define DIGI_PARITY_NONE 0
121 #define DIGI_PARITY_ODD 1
122 #define DIGI_PARITY_EVEN 2
123 #define DIGI_PARITY_MARK 3
124 #define DIGI_PARITY_SPACE 4
126 #define DIGI_STOP_BITS_1 0
127 #define DIGI_STOP_BITS_2 1
129 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
130 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
131 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
133 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
134 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
135 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
137 #define DIGI_DTR_INACTIVE 0
138 #define DIGI_DTR_ACTIVE 1
139 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
141 #define DIGI_RTS_INACTIVE 0
142 #define DIGI_RTS_ACTIVE 1
143 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
144 #define DIGI_RTS_TOGGLE 3
146 #define DIGI_FLUSH_TX 1
147 #define DIGI_FLUSH_RX 2
148 #define DIGI_RESUME_TX 4 /* clears xoff condition */
150 #define DIGI_TRANSMIT_NOT_IDLE 0
151 #define DIGI_TRANSMIT_IDLE 1
153 #define DIGI_DISABLE 0
154 #define DIGI_ENABLE 1
156 #define DIGI_DEASSERT 0
157 #define DIGI_ASSERT 1
159 /* in band status codes */
160 #define DIGI_OVERRUN_ERROR 4
161 #define DIGI_PARITY_ERROR 8
162 #define DIGI_FRAMING_ERROR 16
163 #define DIGI_BREAK_ERROR 32
165 /* out of band status */
166 #define DIGI_NO_ERROR 0
167 #define DIGI_BAD_FIRST_PARAMETER 1
168 #define DIGI_BAD_SECOND_PARAMETER 2
169 #define DIGI_INVALID_LINE 3
170 #define DIGI_INVALID_OPCODE 4
173 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
174 #define DIGI_READ_INPUT_SIGNALS_ERR 2
175 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
176 #define DIGI_READ_INPUT_SIGNALS_PE 8
177 #define DIGI_READ_INPUT_SIGNALS_CTS 16
178 #define DIGI_READ_INPUT_SIGNALS_DSR 32
179 #define DIGI_READ_INPUT_SIGNALS_RI 64
180 #define DIGI_READ_INPUT_SIGNALS_DCD 128
186 spinlock_t ds_serial_lock
;
187 struct usb_serial_port
*ds_oob_port
; /* out-of-band port */
188 int ds_oob_port_num
; /* index of out-of-band port */
189 int ds_device_started
;
193 spinlock_t dp_port_lock
;
196 unsigned char dp_out_buf
[DIGI_OUT_BUF_SIZE
];
197 int dp_write_urb_in_use
;
198 unsigned int dp_modem_signals
;
199 wait_queue_head_t dp_modem_change_wait
;
200 int dp_transmit_idle
;
201 wait_queue_head_t dp_transmit_idle_wait
;
203 int dp_throttle_restart
;
204 wait_queue_head_t dp_flush_wait
;
205 wait_queue_head_t dp_close_wait
; /* wait queue for close */
206 struct work_struct dp_wakeup_work
;
207 struct usb_serial_port
*dp_port
;
211 /* Local Function Declarations */
213 static void digi_wakeup_write(struct usb_serial_port
*port
);
214 static void digi_wakeup_write_lock(struct work_struct
*work
);
215 static int digi_write_oob_command(struct usb_serial_port
*port
,
216 unsigned char *buf
, int count
, int interruptible
);
217 static int digi_write_inb_command(struct usb_serial_port
*port
,
218 unsigned char *buf
, int count
, unsigned long timeout
);
219 static int digi_set_modem_signals(struct usb_serial_port
*port
,
220 unsigned int modem_signals
, int interruptible
);
221 static int digi_transmit_idle(struct usb_serial_port
*port
,
222 unsigned long timeout
);
223 static void digi_rx_throttle(struct tty_struct
*tty
);
224 static void digi_rx_unthrottle(struct tty_struct
*tty
);
225 static void digi_set_termios(struct tty_struct
*tty
,
226 struct usb_serial_port
*port
, struct ktermios
*old_termios
);
227 static void digi_break_ctl(struct tty_struct
*tty
, int break_state
);
228 static int digi_tiocmget(struct tty_struct
*tty
);
229 static int digi_tiocmset(struct tty_struct
*tty
, unsigned int set
,
231 static int digi_write(struct tty_struct
*tty
, struct usb_serial_port
*port
,
232 const unsigned char *buf
, int count
);
233 static void digi_write_bulk_callback(struct urb
*urb
);
234 static int digi_write_room(struct tty_struct
*tty
);
235 static int digi_chars_in_buffer(struct tty_struct
*tty
);
236 static int digi_open(struct tty_struct
*tty
, struct usb_serial_port
*port
);
237 static void digi_close(struct usb_serial_port
*port
);
238 static void digi_dtr_rts(struct usb_serial_port
*port
, int on
);
239 static int digi_startup_device(struct usb_serial
*serial
);
240 static int digi_startup(struct usb_serial
*serial
);
241 static void digi_disconnect(struct usb_serial
*serial
);
242 static void digi_release(struct usb_serial
*serial
);
243 static int digi_port_probe(struct usb_serial_port
*port
);
244 static int digi_port_remove(struct usb_serial_port
*port
);
245 static void digi_read_bulk_callback(struct urb
*urb
);
246 static int digi_read_inb_callback(struct urb
*urb
);
247 static int digi_read_oob_callback(struct urb
*urb
);
250 static const struct usb_device_id id_table_combined
[] = {
251 { USB_DEVICE(DIGI_VENDOR_ID
, DIGI_2_ID
) },
252 { USB_DEVICE(DIGI_VENDOR_ID
, DIGI_4_ID
) },
253 { } /* Terminating entry */
256 static const struct usb_device_id id_table_2
[] = {
257 { USB_DEVICE(DIGI_VENDOR_ID
, DIGI_2_ID
) },
258 { } /* Terminating entry */
261 static const struct usb_device_id id_table_4
[] = {
262 { USB_DEVICE(DIGI_VENDOR_ID
, DIGI_4_ID
) },
263 { } /* Terminating entry */
266 MODULE_DEVICE_TABLE(usb
, id_table_combined
);
268 /* device info needed for the Digi serial converter */
270 static struct usb_serial_driver digi_acceleport_2_device
= {
272 .owner
= THIS_MODULE
,
275 .description
= "Digi 2 port USB adapter",
276 .id_table
= id_table_2
,
280 .dtr_rts
= digi_dtr_rts
,
282 .write_room
= digi_write_room
,
283 .write_bulk_callback
= digi_write_bulk_callback
,
284 .read_bulk_callback
= digi_read_bulk_callback
,
285 .chars_in_buffer
= digi_chars_in_buffer
,
286 .throttle
= digi_rx_throttle
,
287 .unthrottle
= digi_rx_unthrottle
,
288 .set_termios
= digi_set_termios
,
289 .break_ctl
= digi_break_ctl
,
290 .tiocmget
= digi_tiocmget
,
291 .tiocmset
= digi_tiocmset
,
292 .attach
= digi_startup
,
293 .disconnect
= digi_disconnect
,
294 .release
= digi_release
,
295 .port_probe
= digi_port_probe
,
296 .port_remove
= digi_port_remove
,
299 static struct usb_serial_driver digi_acceleport_4_device
= {
301 .owner
= THIS_MODULE
,
304 .description
= "Digi 4 port USB adapter",
305 .id_table
= id_table_4
,
310 .write_room
= digi_write_room
,
311 .write_bulk_callback
= digi_write_bulk_callback
,
312 .read_bulk_callback
= digi_read_bulk_callback
,
313 .chars_in_buffer
= digi_chars_in_buffer
,
314 .throttle
= digi_rx_throttle
,
315 .unthrottle
= digi_rx_unthrottle
,
316 .set_termios
= digi_set_termios
,
317 .break_ctl
= digi_break_ctl
,
318 .tiocmget
= digi_tiocmget
,
319 .tiocmset
= digi_tiocmset
,
320 .attach
= digi_startup
,
321 .disconnect
= digi_disconnect
,
322 .release
= digi_release
,
323 .port_probe
= digi_port_probe
,
324 .port_remove
= digi_port_remove
,
327 static struct usb_serial_driver
* const serial_drivers
[] = {
328 &digi_acceleport_2_device
, &digi_acceleport_4_device
, NULL
334 * Cond Wait Interruptible Timeout Irqrestore
336 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
337 * so that wake ups are not lost if they occur between the unlock
338 * and the sleep. In other words, spin_unlock_irqrestore and
339 * interruptible_sleep_on_timeout are "atomic" with respect to
340 * wake ups. This is used to implement condition variables.
342 * interruptible_sleep_on_timeout is deprecated and has been replaced
343 * with the equivalent code.
346 static long cond_wait_interruptible_timeout_irqrestore(
347 wait_queue_head_t
*q
, long timeout
,
348 spinlock_t
*lock
, unsigned long flags
)
353 prepare_to_wait(q
, &wait
, TASK_INTERRUPTIBLE
);
354 spin_unlock_irqrestore(lock
, flags
);
355 timeout
= schedule_timeout(timeout
);
356 finish_wait(q
, &wait
);
365 * Wake up port, line discipline, and tty processes sleeping
369 static void digi_wakeup_write_lock(struct work_struct
*work
)
371 struct digi_port
*priv
=
372 container_of(work
, struct digi_port
, dp_wakeup_work
);
373 struct usb_serial_port
*port
= priv
->dp_port
;
376 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
377 digi_wakeup_write(port
);
378 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
381 static void digi_wakeup_write(struct usb_serial_port
*port
)
383 struct tty_struct
*tty
= tty_port_tty_get(&port
->port
);
392 * Digi Write OOB Command
394 * Write commands on the out of band port. Commands are 4
395 * bytes each, multiple commands can be sent at once, and
396 * no command will be split across USB packets. Returns 0
397 * if successful, -EINTR if interrupted while sleeping and
398 * the interruptible flag is true, or a negative error
399 * returned by usb_submit_urb.
402 static int digi_write_oob_command(struct usb_serial_port
*port
,
403 unsigned char *buf
, int count
, int interruptible
)
407 struct usb_serial_port
*oob_port
= (struct usb_serial_port
*)((struct digi_serial
*)(usb_get_serial_data(port
->serial
)))->ds_oob_port
;
408 struct digi_port
*oob_priv
= usb_get_serial_port_data(oob_port
);
409 unsigned long flags
= 0;
412 "digi_write_oob_command: TOP: port=%d, count=%d\n",
413 oob_priv
->dp_port_num
, count
);
415 spin_lock_irqsave(&oob_priv
->dp_port_lock
, flags
);
417 while (oob_priv
->dp_write_urb_in_use
) {
418 cond_wait_interruptible_timeout_irqrestore(
419 &oob_port
->write_wait
, DIGI_RETRY_TIMEOUT
,
420 &oob_priv
->dp_port_lock
, flags
);
421 if (interruptible
&& signal_pending(current
))
423 spin_lock_irqsave(&oob_priv
->dp_port_lock
, flags
);
426 /* len must be a multiple of 4, so commands are not split */
427 len
= min(count
, oob_port
->bulk_out_size
);
430 memcpy(oob_port
->write_urb
->transfer_buffer
, buf
, len
);
431 oob_port
->write_urb
->transfer_buffer_length
= len
;
432 ret
= usb_submit_urb(oob_port
->write_urb
, GFP_ATOMIC
);
434 oob_priv
->dp_write_urb_in_use
= 1;
439 spin_unlock_irqrestore(&oob_priv
->dp_port_lock
, flags
);
441 dev_err(&port
->dev
, "%s: usb_submit_urb failed, ret=%d\n",
449 * Digi Write In Band Command
451 * Write commands on the given port. Commands are 4
452 * bytes each, multiple commands can be sent at once, and
453 * no command will be split across USB packets. If timeout
454 * is non-zero, write in band command will return after
455 * waiting unsuccessfully for the URB status to clear for
456 * timeout ticks. Returns 0 if successful, or a negative
457 * error returned by digi_write.
460 static int digi_write_inb_command(struct usb_serial_port
*port
,
461 unsigned char *buf
, int count
, unsigned long timeout
)
465 struct digi_port
*priv
= usb_get_serial_port_data(port
);
466 unsigned char *data
= port
->write_urb
->transfer_buffer
;
467 unsigned long flags
= 0;
469 dev_dbg(&port
->dev
, "digi_write_inb_command: TOP: port=%d, count=%d\n",
470 priv
->dp_port_num
, count
);
477 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
478 while (count
> 0 && ret
== 0) {
479 while (priv
->dp_write_urb_in_use
&&
480 time_before(jiffies
, timeout
)) {
481 cond_wait_interruptible_timeout_irqrestore(
482 &port
->write_wait
, DIGI_RETRY_TIMEOUT
,
483 &priv
->dp_port_lock
, flags
);
484 if (signal_pending(current
))
486 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
489 /* len must be a multiple of 4 and small enough to */
490 /* guarantee the write will send buffered data first, */
491 /* so commands are in order with data and not split */
492 len
= min(count
, port
->bulk_out_size
-2-priv
->dp_out_buf_len
);
496 /* write any buffered data first */
497 if (priv
->dp_out_buf_len
> 0) {
498 data
[0] = DIGI_CMD_SEND_DATA
;
499 data
[1] = priv
->dp_out_buf_len
;
500 memcpy(data
+ 2, priv
->dp_out_buf
,
501 priv
->dp_out_buf_len
);
502 memcpy(data
+ 2 + priv
->dp_out_buf_len
, buf
, len
);
503 port
->write_urb
->transfer_buffer_length
504 = priv
->dp_out_buf_len
+ 2 + len
;
506 memcpy(data
, buf
, len
);
507 port
->write_urb
->transfer_buffer_length
= len
;
510 ret
= usb_submit_urb(port
->write_urb
, GFP_ATOMIC
);
512 priv
->dp_write_urb_in_use
= 1;
513 priv
->dp_out_buf_len
= 0;
519 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
523 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
524 __func__
, ret
, priv
->dp_port_num
);
530 * Digi Set Modem Signals
532 * Sets or clears DTR and RTS on the port, according to the
533 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
534 * for the modem_signals argument. Returns 0 if successful,
535 * -EINTR if interrupted while sleeping, or a non-zero error
536 * returned by usb_submit_urb.
539 static int digi_set_modem_signals(struct usb_serial_port
*port
,
540 unsigned int modem_signals
, int interruptible
)
544 struct digi_port
*port_priv
= usb_get_serial_port_data(port
);
545 struct usb_serial_port
*oob_port
= (struct usb_serial_port
*) ((struct digi_serial
*)(usb_get_serial_data(port
->serial
)))->ds_oob_port
;
546 struct digi_port
*oob_priv
= usb_get_serial_port_data(oob_port
);
547 unsigned char *data
= oob_port
->write_urb
->transfer_buffer
;
548 unsigned long flags
= 0;
552 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
553 port_priv
->dp_port_num
, modem_signals
);
555 spin_lock_irqsave(&oob_priv
->dp_port_lock
, flags
);
556 spin_lock(&port_priv
->dp_port_lock
);
558 while (oob_priv
->dp_write_urb_in_use
) {
559 spin_unlock(&port_priv
->dp_port_lock
);
560 cond_wait_interruptible_timeout_irqrestore(
561 &oob_port
->write_wait
, DIGI_RETRY_TIMEOUT
,
562 &oob_priv
->dp_port_lock
, flags
);
563 if (interruptible
&& signal_pending(current
))
565 spin_lock_irqsave(&oob_priv
->dp_port_lock
, flags
);
566 spin_lock(&port_priv
->dp_port_lock
);
568 data
[0] = DIGI_CMD_SET_DTR_SIGNAL
;
569 data
[1] = port_priv
->dp_port_num
;
570 data
[2] = (modem_signals
& TIOCM_DTR
) ?
571 DIGI_DTR_ACTIVE
: DIGI_DTR_INACTIVE
;
573 data
[4] = DIGI_CMD_SET_RTS_SIGNAL
;
574 data
[5] = port_priv
->dp_port_num
;
575 data
[6] = (modem_signals
& TIOCM_RTS
) ?
576 DIGI_RTS_ACTIVE
: DIGI_RTS_INACTIVE
;
579 oob_port
->write_urb
->transfer_buffer_length
= 8;
581 ret
= usb_submit_urb(oob_port
->write_urb
, GFP_ATOMIC
);
583 oob_priv
->dp_write_urb_in_use
= 1;
584 port_priv
->dp_modem_signals
=
585 (port_priv
->dp_modem_signals
&~(TIOCM_DTR
|TIOCM_RTS
))
586 | (modem_signals
&(TIOCM_DTR
|TIOCM_RTS
));
588 spin_unlock(&port_priv
->dp_port_lock
);
589 spin_unlock_irqrestore(&oob_priv
->dp_port_lock
, flags
);
591 dev_err(&port
->dev
, "%s: usb_submit_urb failed, ret=%d\n",
599 * Digi transmit idle waits, up to timeout ticks, for the transmitter
600 * to go idle. It returns 0 if successful or a negative error.
602 * There are race conditions here if more than one process is calling
603 * digi_transmit_idle on the same port at the same time. However, this
604 * is only called from close, and only one process can be in close on a
605 * port at a time, so its ok.
608 static int digi_transmit_idle(struct usb_serial_port
*port
,
609 unsigned long timeout
)
612 unsigned char buf
[2];
613 struct digi_port
*priv
= usb_get_serial_port_data(port
);
614 unsigned long flags
= 0;
616 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
617 priv
->dp_transmit_idle
= 0;
618 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
620 buf
[0] = DIGI_CMD_TRANSMIT_IDLE
;
625 ret
= digi_write_inb_command(port
, buf
, 2, timeout
- jiffies
);
629 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
631 while (time_before(jiffies
, timeout
) && !priv
->dp_transmit_idle
) {
632 cond_wait_interruptible_timeout_irqrestore(
633 &priv
->dp_transmit_idle_wait
, DIGI_RETRY_TIMEOUT
,
634 &priv
->dp_port_lock
, flags
);
635 if (signal_pending(current
))
637 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
639 priv
->dp_transmit_idle
= 0;
640 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
646 static void digi_rx_throttle(struct tty_struct
*tty
)
649 struct usb_serial_port
*port
= tty
->driver_data
;
650 struct digi_port
*priv
= usb_get_serial_port_data(port
);
652 /* stop receiving characters by not resubmitting the read urb */
653 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
654 priv
->dp_throttled
= 1;
655 priv
->dp_throttle_restart
= 0;
656 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
660 static void digi_rx_unthrottle(struct tty_struct
*tty
)
664 struct usb_serial_port
*port
= tty
->driver_data
;
665 struct digi_port
*priv
= usb_get_serial_port_data(port
);
667 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
669 /* restart read chain */
670 if (priv
->dp_throttle_restart
)
671 ret
= usb_submit_urb(port
->read_urb
, GFP_ATOMIC
);
673 /* turn throttle off */
674 priv
->dp_throttled
= 0;
675 priv
->dp_throttle_restart
= 0;
677 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
681 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
682 __func__
, ret
, priv
->dp_port_num
);
686 static void digi_set_termios(struct tty_struct
*tty
,
687 struct usb_serial_port
*port
, struct ktermios
*old_termios
)
689 struct digi_port
*priv
= usb_get_serial_port_data(port
);
690 struct device
*dev
= &port
->dev
;
691 unsigned int iflag
= tty
->termios
.c_iflag
;
692 unsigned int cflag
= tty
->termios
.c_cflag
;
693 unsigned int old_iflag
= old_termios
->c_iflag
;
694 unsigned int old_cflag
= old_termios
->c_cflag
;
695 unsigned char buf
[32];
696 unsigned int modem_signals
;
702 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
703 priv
->dp_port_num
, iflag
, old_iflag
, cflag
, old_cflag
);
706 baud
= tty_get_baud_rate(tty
);
707 if (baud
!= tty_termios_baud_rate(old_termios
)) {
710 /* reassert DTR and (maybe) RTS on transition from B0 */
711 if ((old_cflag
&CBAUD
) == B0
) {
712 /* don't set RTS if using hardware flow control */
713 /* and throttling input */
714 modem_signals
= TIOCM_DTR
;
715 if (!(tty
->termios
.c_cflag
& CRTSCTS
) ||
716 !test_bit(TTY_THROTTLED
, &tty
->flags
))
717 modem_signals
|= TIOCM_RTS
;
718 digi_set_modem_signals(port
, modem_signals
, 1);
721 /* drop DTR and RTS on transition to B0 */
722 case 0: digi_set_modem_signals(port
, 0, 1); break;
723 case 50: arg
= DIGI_BAUD_50
; break;
724 case 75: arg
= DIGI_BAUD_75
; break;
725 case 110: arg
= DIGI_BAUD_110
; break;
726 case 150: arg
= DIGI_BAUD_150
; break;
727 case 200: arg
= DIGI_BAUD_200
; break;
728 case 300: arg
= DIGI_BAUD_300
; break;
729 case 600: arg
= DIGI_BAUD_600
; break;
730 case 1200: arg
= DIGI_BAUD_1200
; break;
731 case 1800: arg
= DIGI_BAUD_1800
; break;
732 case 2400: arg
= DIGI_BAUD_2400
; break;
733 case 4800: arg
= DIGI_BAUD_4800
; break;
734 case 9600: arg
= DIGI_BAUD_9600
; break;
735 case 19200: arg
= DIGI_BAUD_19200
; break;
736 case 38400: arg
= DIGI_BAUD_38400
; break;
737 case 57600: arg
= DIGI_BAUD_57600
; break;
738 case 115200: arg
= DIGI_BAUD_115200
; break;
739 case 230400: arg
= DIGI_BAUD_230400
; break;
740 case 460800: arg
= DIGI_BAUD_460800
; break;
742 arg
= DIGI_BAUD_9600
;
747 buf
[i
++] = DIGI_CMD_SET_BAUD_RATE
;
748 buf
[i
++] = priv
->dp_port_num
;
754 tty
->termios
.c_cflag
&= ~CMSPAR
;
756 if ((cflag
&(PARENB
|PARODD
)) != (old_cflag
&(PARENB
|PARODD
))) {
759 arg
= DIGI_PARITY_ODD
;
761 arg
= DIGI_PARITY_EVEN
;
763 arg
= DIGI_PARITY_NONE
;
765 buf
[i
++] = DIGI_CMD_SET_PARITY
;
766 buf
[i
++] = priv
->dp_port_num
;
771 if ((cflag
&CSIZE
) != (old_cflag
&CSIZE
)) {
773 switch (cflag
&CSIZE
) {
774 case CS5
: arg
= DIGI_WORD_SIZE_5
; break;
775 case CS6
: arg
= DIGI_WORD_SIZE_6
; break;
776 case CS7
: arg
= DIGI_WORD_SIZE_7
; break;
777 case CS8
: arg
= DIGI_WORD_SIZE_8
; break;
780 "digi_set_termios: can't handle word size %d\n",
786 buf
[i
++] = DIGI_CMD_SET_WORD_SIZE
;
787 buf
[i
++] = priv
->dp_port_num
;
795 if ((cflag
&CSTOPB
) != (old_cflag
&CSTOPB
)) {
798 arg
= DIGI_STOP_BITS_2
;
800 arg
= DIGI_STOP_BITS_1
;
802 buf
[i
++] = DIGI_CMD_SET_STOP_BITS
;
803 buf
[i
++] = priv
->dp_port_num
;
809 /* set input flow control */
810 if ((iflag
&IXOFF
) != (old_iflag
&IXOFF
)
811 || (cflag
&CRTSCTS
) != (old_cflag
&CRTSCTS
)) {
814 arg
|= DIGI_INPUT_FLOW_CONTROL_XON_XOFF
;
816 arg
&= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF
;
819 arg
|= DIGI_INPUT_FLOW_CONTROL_RTS
;
821 /* On USB-4 it is necessary to assert RTS prior */
822 /* to selecting RTS input flow control. */
823 buf
[i
++] = DIGI_CMD_SET_RTS_SIGNAL
;
824 buf
[i
++] = priv
->dp_port_num
;
825 buf
[i
++] = DIGI_RTS_ACTIVE
;
829 arg
&= ~DIGI_INPUT_FLOW_CONTROL_RTS
;
831 buf
[i
++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL
;
832 buf
[i
++] = priv
->dp_port_num
;
837 /* set output flow control */
838 if ((iflag
& IXON
) != (old_iflag
& IXON
)
839 || (cflag
& CRTSCTS
) != (old_cflag
& CRTSCTS
)) {
842 arg
|= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF
;
844 arg
&= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF
;
846 if (cflag
& CRTSCTS
) {
847 arg
|= DIGI_OUTPUT_FLOW_CONTROL_CTS
;
849 arg
&= ~DIGI_OUTPUT_FLOW_CONTROL_CTS
;
853 buf
[i
++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL
;
854 buf
[i
++] = priv
->dp_port_num
;
859 /* set receive enable/disable */
860 if ((cflag
& CREAD
) != (old_cflag
& CREAD
)) {
866 buf
[i
++] = DIGI_CMD_RECEIVE_ENABLE
;
867 buf
[i
++] = priv
->dp_port_num
;
871 ret
= digi_write_oob_command(port
, buf
, i
, 1);
873 dev_dbg(dev
, "digi_set_termios: write oob failed, ret=%d\n", ret
);
874 tty_encode_baud_rate(tty
, baud
, baud
);
878 static void digi_break_ctl(struct tty_struct
*tty
, int break_state
)
880 struct usb_serial_port
*port
= tty
->driver_data
;
881 unsigned char buf
[4];
883 buf
[0] = DIGI_CMD_BREAK_CONTROL
;
884 buf
[1] = 2; /* length */
885 buf
[2] = break_state
? 1 : 0;
886 buf
[3] = 0; /* pad */
887 digi_write_inb_command(port
, buf
, 4, 0);
891 static int digi_tiocmget(struct tty_struct
*tty
)
893 struct usb_serial_port
*port
= tty
->driver_data
;
894 struct digi_port
*priv
= usb_get_serial_port_data(port
);
898 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
899 val
= priv
->dp_modem_signals
;
900 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
905 static int digi_tiocmset(struct tty_struct
*tty
,
906 unsigned int set
, unsigned int clear
)
908 struct usb_serial_port
*port
= tty
->driver_data
;
909 struct digi_port
*priv
= usb_get_serial_port_data(port
);
913 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
914 val
= (priv
->dp_modem_signals
& ~clear
) | set
;
915 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
916 return digi_set_modem_signals(port
, val
, 1);
920 static int digi_write(struct tty_struct
*tty
, struct usb_serial_port
*port
,
921 const unsigned char *buf
, int count
)
924 int ret
, data_len
, new_len
;
925 struct digi_port
*priv
= usb_get_serial_port_data(port
);
926 unsigned char *data
= port
->write_urb
->transfer_buffer
;
927 unsigned long flags
= 0;
930 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
931 priv
->dp_port_num
, count
, in_interrupt());
933 /* copy user data (which can sleep) before getting spin lock */
934 count
= min(count
, port
->bulk_out_size
-2);
935 count
= min(64, count
);
937 /* be sure only one write proceeds at a time */
938 /* there are races on the port private buffer */
939 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
941 /* wait for urb status clear to submit another urb */
942 if (priv
->dp_write_urb_in_use
) {
943 /* buffer data if count is 1 (probably put_char) if possible */
944 if (count
== 1 && priv
->dp_out_buf_len
< DIGI_OUT_BUF_SIZE
) {
945 priv
->dp_out_buf
[priv
->dp_out_buf_len
++] = *buf
;
950 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
954 /* allow space for any buffered data and for new data, up to */
955 /* transfer buffer size - 2 (for command and length bytes) */
956 new_len
= min(count
, port
->bulk_out_size
-2-priv
->dp_out_buf_len
);
957 data_len
= new_len
+ priv
->dp_out_buf_len
;
960 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
964 port
->write_urb
->transfer_buffer_length
= data_len
+2;
966 *data
++ = DIGI_CMD_SEND_DATA
;
969 /* copy in buffered data first */
970 memcpy(data
, priv
->dp_out_buf
, priv
->dp_out_buf_len
);
971 data
+= priv
->dp_out_buf_len
;
973 /* copy in new data */
974 memcpy(data
, buf
, new_len
);
976 ret
= usb_submit_urb(port
->write_urb
, GFP_ATOMIC
);
978 priv
->dp_write_urb_in_use
= 1;
980 priv
->dp_out_buf_len
= 0;
983 /* return length of new data written, or error */
984 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
986 dev_err_console(port
,
987 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
988 __func__
, ret
, priv
->dp_port_num
);
989 dev_dbg(&port
->dev
, "digi_write: returning %d\n", ret
);
994 static void digi_write_bulk_callback(struct urb
*urb
)
997 struct usb_serial_port
*port
= urb
->context
;
998 struct usb_serial
*serial
;
999 struct digi_port
*priv
;
1000 struct digi_serial
*serial_priv
;
1002 int status
= urb
->status
;
1004 /* port and serial sanity check */
1005 if (port
== NULL
|| (priv
= usb_get_serial_port_data(port
)) == NULL
) {
1006 pr_err("%s: port or port->private is NULL, status=%d\n",
1010 serial
= port
->serial
;
1011 if (serial
== NULL
|| (serial_priv
= usb_get_serial_data(serial
)) == NULL
) {
1013 "%s: serial or serial->private is NULL, status=%d\n",
1018 /* handle oob callback */
1019 if (priv
->dp_port_num
== serial_priv
->ds_oob_port_num
) {
1020 dev_dbg(&port
->dev
, "digi_write_bulk_callback: oob callback\n");
1021 spin_lock(&priv
->dp_port_lock
);
1022 priv
->dp_write_urb_in_use
= 0;
1023 wake_up_interruptible(&port
->write_wait
);
1024 spin_unlock(&priv
->dp_port_lock
);
1028 /* try to send any buffered data on this port */
1029 spin_lock(&priv
->dp_port_lock
);
1030 priv
->dp_write_urb_in_use
= 0;
1031 if (priv
->dp_out_buf_len
> 0) {
1032 *((unsigned char *)(port
->write_urb
->transfer_buffer
))
1033 = (unsigned char)DIGI_CMD_SEND_DATA
;
1034 *((unsigned char *)(port
->write_urb
->transfer_buffer
) + 1)
1035 = (unsigned char)priv
->dp_out_buf_len
;
1036 port
->write_urb
->transfer_buffer_length
=
1037 priv
->dp_out_buf_len
+ 2;
1038 memcpy(port
->write_urb
->transfer_buffer
+ 2, priv
->dp_out_buf
,
1039 priv
->dp_out_buf_len
);
1040 ret
= usb_submit_urb(port
->write_urb
, GFP_ATOMIC
);
1042 priv
->dp_write_urb_in_use
= 1;
1043 priv
->dp_out_buf_len
= 0;
1046 /* wake up processes sleeping on writes immediately */
1047 digi_wakeup_write(port
);
1048 /* also queue up a wakeup at scheduler time, in case we */
1049 /* lost the race in write_chan(). */
1050 schedule_work(&priv
->dp_wakeup_work
);
1052 spin_unlock(&priv
->dp_port_lock
);
1053 if (ret
&& ret
!= -EPERM
)
1054 dev_err_console(port
,
1055 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1056 __func__
, ret
, priv
->dp_port_num
);
1059 static int digi_write_room(struct tty_struct
*tty
)
1061 struct usb_serial_port
*port
= tty
->driver_data
;
1062 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1064 unsigned long flags
= 0;
1066 spin_lock_irqsave(&priv
->dp_port_lock
, flags
);
1068 if (priv
->dp_write_urb_in_use
)
1071 room
= port
->bulk_out_size
- 2 - priv
->dp_out_buf_len
;
1073 spin_unlock_irqrestore(&priv
->dp_port_lock
, flags
);
1074 dev_dbg(&port
->dev
, "digi_write_room: port=%d, room=%d\n", priv
->dp_port_num
, room
);
1079 static int digi_chars_in_buffer(struct tty_struct
*tty
)
1081 struct usb_serial_port
*port
= tty
->driver_data
;
1082 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1084 if (priv
->dp_write_urb_in_use
) {
1085 dev_dbg(&port
->dev
, "digi_chars_in_buffer: port=%d, chars=%d\n",
1086 priv
->dp_port_num
, port
->bulk_out_size
- 2);
1087 /* return(port->bulk_out_size - 2); */
1090 dev_dbg(&port
->dev
, "digi_chars_in_buffer: port=%d, chars=%d\n",
1091 priv
->dp_port_num
, priv
->dp_out_buf_len
);
1092 return priv
->dp_out_buf_len
;
1097 static void digi_dtr_rts(struct usb_serial_port
*port
, int on
)
1099 /* Adjust DTR and RTS */
1100 digi_set_modem_signals(port
, on
* (TIOCM_DTR
|TIOCM_RTS
), 1);
1103 static int digi_open(struct tty_struct
*tty
, struct usb_serial_port
*port
)
1106 unsigned char buf
[32];
1107 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1108 struct ktermios not_termios
;
1110 /* be sure the device is started up */
1111 if (digi_startup_device(port
->serial
) != 0)
1114 /* read modem signals automatically whenever they change */
1115 buf
[0] = DIGI_CMD_READ_INPUT_SIGNALS
;
1116 buf
[1] = priv
->dp_port_num
;
1117 buf
[2] = DIGI_ENABLE
;
1121 buf
[4] = DIGI_CMD_IFLUSH_FIFO
;
1122 buf
[5] = priv
->dp_port_num
;
1123 buf
[6] = DIGI_FLUSH_TX
| DIGI_FLUSH_RX
;
1126 ret
= digi_write_oob_command(port
, buf
, 8, 1);
1128 dev_dbg(&port
->dev
, "digi_open: write oob failed, ret=%d\n", ret
);
1130 /* set termios settings */
1132 not_termios
.c_cflag
= ~tty
->termios
.c_cflag
;
1133 not_termios
.c_iflag
= ~tty
->termios
.c_iflag
;
1134 digi_set_termios(tty
, port
, ¬_termios
);
1140 static void digi_close(struct usb_serial_port
*port
)
1144 unsigned char buf
[32];
1145 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1147 mutex_lock(&port
->serial
->disc_mutex
);
1148 /* if disconnected, just clear flags */
1149 if (port
->serial
->disconnected
)
1152 if (port
->serial
->dev
) {
1153 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1154 digi_transmit_idle(port
, DIGI_CLOSE_TIMEOUT
);
1156 /* disable input flow control */
1157 buf
[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL
;
1158 buf
[1] = priv
->dp_port_num
;
1159 buf
[2] = DIGI_DISABLE
;
1162 /* disable output flow control */
1163 buf
[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL
;
1164 buf
[5] = priv
->dp_port_num
;
1165 buf
[6] = DIGI_DISABLE
;
1168 /* disable reading modem signals automatically */
1169 buf
[8] = DIGI_CMD_READ_INPUT_SIGNALS
;
1170 buf
[9] = priv
->dp_port_num
;
1171 buf
[10] = DIGI_DISABLE
;
1174 /* disable receive */
1175 buf
[12] = DIGI_CMD_RECEIVE_ENABLE
;
1176 buf
[13] = priv
->dp_port_num
;
1177 buf
[14] = DIGI_DISABLE
;
1181 buf
[16] = DIGI_CMD_IFLUSH_FIFO
;
1182 buf
[17] = priv
->dp_port_num
;
1183 buf
[18] = DIGI_FLUSH_TX
| DIGI_FLUSH_RX
;
1186 ret
= digi_write_oob_command(port
, buf
, 20, 0);
1188 dev_dbg(&port
->dev
, "digi_close: write oob failed, ret=%d\n", ret
);
1190 /* wait for final commands on oob port to complete */
1191 prepare_to_wait(&priv
->dp_flush_wait
, &wait
,
1192 TASK_INTERRUPTIBLE
);
1193 schedule_timeout(DIGI_CLOSE_TIMEOUT
);
1194 finish_wait(&priv
->dp_flush_wait
, &wait
);
1196 /* shutdown any outstanding bulk writes */
1197 usb_kill_urb(port
->write_urb
);
1200 spin_lock_irq(&priv
->dp_port_lock
);
1201 priv
->dp_write_urb_in_use
= 0;
1202 wake_up_interruptible(&priv
->dp_close_wait
);
1203 spin_unlock_irq(&priv
->dp_port_lock
);
1204 mutex_unlock(&port
->serial
->disc_mutex
);
1209 * Digi Startup Device
1211 * Starts reads on all ports. Must be called AFTER startup, with
1212 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1215 static int digi_startup_device(struct usb_serial
*serial
)
1218 struct digi_serial
*serial_priv
= usb_get_serial_data(serial
);
1219 struct usb_serial_port
*port
;
1221 /* be sure this happens exactly once */
1222 spin_lock(&serial_priv
->ds_serial_lock
);
1223 if (serial_priv
->ds_device_started
) {
1224 spin_unlock(&serial_priv
->ds_serial_lock
);
1227 serial_priv
->ds_device_started
= 1;
1228 spin_unlock(&serial_priv
->ds_serial_lock
);
1230 /* start reading from each bulk in endpoint for the device */
1231 /* set USB_DISABLE_SPD flag for write bulk urbs */
1232 for (i
= 0; i
< serial
->type
->num_ports
+ 1; i
++) {
1233 port
= serial
->port
[i
];
1234 ret
= usb_submit_urb(port
->read_urb
, GFP_KERNEL
);
1237 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1245 static int digi_port_init(struct usb_serial_port
*port
, unsigned port_num
)
1247 struct digi_port
*priv
;
1249 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1253 spin_lock_init(&priv
->dp_port_lock
);
1254 priv
->dp_port_num
= port_num
;
1255 init_waitqueue_head(&priv
->dp_modem_change_wait
);
1256 init_waitqueue_head(&priv
->dp_transmit_idle_wait
);
1257 init_waitqueue_head(&priv
->dp_flush_wait
);
1258 init_waitqueue_head(&priv
->dp_close_wait
);
1259 INIT_WORK(&priv
->dp_wakeup_work
, digi_wakeup_write_lock
);
1260 priv
->dp_port
= port
;
1262 init_waitqueue_head(&port
->write_wait
);
1264 usb_set_serial_port_data(port
, priv
);
1269 static int digi_startup(struct usb_serial
*serial
)
1271 struct digi_serial
*serial_priv
;
1274 serial_priv
= kzalloc(sizeof(*serial_priv
), GFP_KERNEL
);
1278 spin_lock_init(&serial_priv
->ds_serial_lock
);
1279 serial_priv
->ds_oob_port_num
= serial
->type
->num_ports
;
1280 serial_priv
->ds_oob_port
= serial
->port
[serial_priv
->ds_oob_port_num
];
1282 ret
= digi_port_init(serial_priv
->ds_oob_port
,
1283 serial_priv
->ds_oob_port_num
);
1289 usb_set_serial_data(serial
, serial_priv
);
1295 static void digi_disconnect(struct usb_serial
*serial
)
1299 /* stop reads and writes on all ports */
1300 for (i
= 0; i
< serial
->type
->num_ports
+ 1; i
++) {
1301 usb_kill_urb(serial
->port
[i
]->read_urb
);
1302 usb_kill_urb(serial
->port
[i
]->write_urb
);
1307 static void digi_release(struct usb_serial
*serial
)
1309 struct digi_serial
*serial_priv
;
1310 struct digi_port
*priv
;
1312 serial_priv
= usb_get_serial_data(serial
);
1314 priv
= usb_get_serial_port_data(serial_priv
->ds_oob_port
);
1320 static int digi_port_probe(struct usb_serial_port
*port
)
1324 port_num
= port
->number
- port
->serial
->minor
;
1326 return digi_port_init(port
, port_num
);
1329 static int digi_port_remove(struct usb_serial_port
*port
)
1331 struct digi_port
*priv
;
1333 priv
= usb_get_serial_port_data(port
);
1339 static void digi_read_bulk_callback(struct urb
*urb
)
1341 struct usb_serial_port
*port
= urb
->context
;
1342 struct digi_port
*priv
;
1343 struct digi_serial
*serial_priv
;
1345 int status
= urb
->status
;
1347 /* port sanity check, do not resubmit if port is not valid */
1350 priv
= usb_get_serial_port_data(port
);
1352 dev_err(&port
->dev
, "%s: port->private is NULL, status=%d\n",
1356 if (port
->serial
== NULL
||
1357 (serial_priv
= usb_get_serial_data(port
->serial
)) == NULL
) {
1358 dev_err(&port
->dev
, "%s: serial is bad or serial->private "
1359 "is NULL, status=%d\n", __func__
, status
);
1363 /* do not resubmit urb if it has any status error */
1366 "%s: nonzero read bulk status: status=%d, port=%d\n",
1367 __func__
, status
, priv
->dp_port_num
);
1371 /* handle oob or inb callback, do not resubmit if error */
1372 if (priv
->dp_port_num
== serial_priv
->ds_oob_port_num
) {
1373 if (digi_read_oob_callback(urb
) != 0)
1376 if (digi_read_inb_callback(urb
) != 0)
1381 ret
= usb_submit_urb(urb
, GFP_ATOMIC
);
1382 if (ret
!= 0 && ret
!= -EPERM
) {
1384 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1385 __func__
, ret
, priv
->dp_port_num
);
1391 * Digi Read INB Callback
1393 * Digi Read INB Callback handles reads on the in band ports, sending
1394 * the data on to the tty subsystem. When called we know port and
1395 * port->private are not NULL and port->serial has been validated.
1396 * It returns 0 if successful, 1 if successful but the port is
1397 * throttled, and -1 if the sanity checks failed.
1400 static int digi_read_inb_callback(struct urb
*urb
)
1402 struct usb_serial_port
*port
= urb
->context
;
1403 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1404 int opcode
= ((unsigned char *)urb
->transfer_buffer
)[0];
1405 int len
= ((unsigned char *)urb
->transfer_buffer
)[1];
1406 int port_status
= ((unsigned char *)urb
->transfer_buffer
)[2];
1407 unsigned char *data
= ((unsigned char *)urb
->transfer_buffer
) + 3;
1408 int flag
, throttled
;
1409 int status
= urb
->status
;
1411 /* do not process callbacks on closed ports */
1412 /* but do continue the read chain */
1413 if (urb
->status
== -ENOENT
)
1416 /* short/multiple packet check */
1417 if (urb
->actual_length
!= len
+ 2) {
1418 dev_err(&port
->dev
, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1419 "status=%d, port=%d, opcode=%d, len=%d, "
1420 "actual_length=%d, status=%d\n", __func__
, status
,
1421 priv
->dp_port_num
, opcode
, len
, urb
->actual_length
,
1426 spin_lock(&priv
->dp_port_lock
);
1428 /* check for throttle; if set, do not resubmit read urb */
1429 /* indicate the read chain needs to be restarted on unthrottle */
1430 throttled
= priv
->dp_throttled
;
1432 priv
->dp_throttle_restart
= 1;
1435 if (opcode
== DIGI_CMD_RECEIVE_DATA
) {
1436 /* get flag from port_status */
1439 /* overrun is special, not associated with a char */
1440 if (port_status
& DIGI_OVERRUN_ERROR
)
1441 tty_insert_flip_char(&port
->port
, 0, TTY_OVERRUN
);
1443 /* break takes precedence over parity, */
1444 /* which takes precedence over framing errors */
1445 if (port_status
& DIGI_BREAK_ERROR
)
1447 else if (port_status
& DIGI_PARITY_ERROR
)
1449 else if (port_status
& DIGI_FRAMING_ERROR
)
1452 /* data length is len-1 (one byte of len is port_status) */
1455 tty_insert_flip_string_fixed_flag(&port
->port
, data
,
1457 tty_flip_buffer_push(&port
->port
);
1460 spin_unlock(&priv
->dp_port_lock
);
1462 if (opcode
== DIGI_CMD_RECEIVE_DISABLE
)
1463 dev_dbg(&port
->dev
, "%s: got RECEIVE_DISABLE\n", __func__
);
1464 else if (opcode
!= DIGI_CMD_RECEIVE_DATA
)
1465 dev_dbg(&port
->dev
, "%s: unknown opcode: %d\n", __func__
, opcode
);
1467 return throttled
? 1 : 0;
1473 * Digi Read OOB Callback
1475 * Digi Read OOB Callback handles reads on the out of band port.
1476 * When called we know port and port->private are not NULL and
1477 * the port->serial is valid. It returns 0 if successful, and
1478 * -1 if the sanity checks failed.
1481 static int digi_read_oob_callback(struct urb
*urb
)
1484 struct usb_serial_port
*port
= urb
->context
;
1485 struct usb_serial
*serial
= port
->serial
;
1486 struct tty_struct
*tty
;
1487 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1488 int opcode
, line
, status
, val
;
1492 /* handle each oob command */
1493 for (i
= 0; i
< urb
->actual_length
- 3;) {
1494 opcode
= ((unsigned char *)urb
->transfer_buffer
)[i
++];
1495 line
= ((unsigned char *)urb
->transfer_buffer
)[i
++];
1496 status
= ((unsigned char *)urb
->transfer_buffer
)[i
++];
1497 val
= ((unsigned char *)urb
->transfer_buffer
)[i
++];
1499 dev_dbg(&port
->dev
, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1500 opcode
, line
, status
, val
);
1502 if (status
!= 0 || line
>= serial
->type
->num_ports
)
1505 port
= serial
->port
[line
];
1507 priv
= usb_get_serial_port_data(port
);
1511 tty
= tty_port_tty_get(&port
->port
);
1515 rts
= tty
->termios
.c_cflag
& CRTSCTS
;
1517 if (tty
&& opcode
== DIGI_CMD_READ_INPUT_SIGNALS
) {
1518 spin_lock(&priv
->dp_port_lock
);
1519 /* convert from digi flags to termiox flags */
1520 if (val
& DIGI_READ_INPUT_SIGNALS_CTS
) {
1521 priv
->dp_modem_signals
|= TIOCM_CTS
;
1522 /* port must be open to use tty struct */
1524 tty
->hw_stopped
= 0;
1525 digi_wakeup_write(port
);
1528 priv
->dp_modem_signals
&= ~TIOCM_CTS
;
1529 /* port must be open to use tty struct */
1531 tty
->hw_stopped
= 1;
1533 if (val
& DIGI_READ_INPUT_SIGNALS_DSR
)
1534 priv
->dp_modem_signals
|= TIOCM_DSR
;
1536 priv
->dp_modem_signals
&= ~TIOCM_DSR
;
1537 if (val
& DIGI_READ_INPUT_SIGNALS_RI
)
1538 priv
->dp_modem_signals
|= TIOCM_RI
;
1540 priv
->dp_modem_signals
&= ~TIOCM_RI
;
1541 if (val
& DIGI_READ_INPUT_SIGNALS_DCD
)
1542 priv
->dp_modem_signals
|= TIOCM_CD
;
1544 priv
->dp_modem_signals
&= ~TIOCM_CD
;
1546 wake_up_interruptible(&priv
->dp_modem_change_wait
);
1547 spin_unlock(&priv
->dp_port_lock
);
1548 } else if (opcode
== DIGI_CMD_TRANSMIT_IDLE
) {
1549 spin_lock(&priv
->dp_port_lock
);
1550 priv
->dp_transmit_idle
= 1;
1551 wake_up_interruptible(&priv
->dp_transmit_idle_wait
);
1552 spin_unlock(&priv
->dp_port_lock
);
1553 } else if (opcode
== DIGI_CMD_IFLUSH_FIFO
) {
1554 wake_up_interruptible(&priv
->dp_flush_wait
);
1562 module_usb_serial_driver(serial_drivers
, id_table_combined
);
1564 MODULE_AUTHOR(DRIVER_AUTHOR
);
1565 MODULE_DESCRIPTION(DRIVER_DESC
);
1566 MODULE_LICENSE("GPL");