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[davej-history.git] / drivers / usb / serial / digi_acceleport.c
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1 /*
2 * Digi AccelePort USB-4 Serial Converter
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
12 * usb-serial driver.
14 * Peter Berger (pberger@brimson.com)
15 * Al Borchers (borchers@steinerpoint.com)
17 * (8/8/2000) pberger and borchers
18 * -- Fixed close so that
19 * - it can timeout while waiting for transmit idle, if needed;
20 * - it ignores interrupts when flushing the port, turning
21 * of modem signalling, and so on;
22 * - it waits for the flush to really complete before returning.
23 * -- Read_bulk_callback and write_bulk_callback check for a closed
24 * port before using the tty struct or writing to the port.
25 * -- The two changes above fix the oops caused by interrupted closes.
26 * -- Added interruptible args to write_oob_command and set_modem_signals
27 * and added a timeout arg to transmit_idle; needed for fixes to
28 * close.
29 * -- Added code for rx_throttle and rx_unthrottle so that input flow
30 * control works.
31 * -- Added code to set overrun, parity, framing, and break errors
32 * (untested).
33 * -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length
34 * bulk writes are done. These hung the Digi USB device. The
35 * 0 length bulk writes were a new feature of usb-uhci added in
36 * the 2.4.0-test6 kernels.
37 * -- Fixed mod inc race in open; do mod inc before sleeping to wait
38 * for a close to finish.
40 * (7/31/2000) pberger
41 * -- Fixed bugs with hardware handshaking:
42 * - Added code to set/clear tty->hw_stopped in digi_read_oob_callback()
43 * and digi_set_termios()
44 * -- Added code in digi_set_termios() to
45 * - add conditional in code handling transition from B0 to only
46 * set RTS if RTS/CTS flow control is either not in use or if
47 * the port is not currently throttled.
48 * - handle turning off CRTSCTS.
50 * (7/30/2000) borchers
51 * -- Added support for more than one Digi USB device by moving
52 * globals to a private structure in the pointed to from the
53 * usb_serial structure.
54 * -- Moved the modem change and transmit idle wait queues into
55 * the port private structure, so each port has its own queue
56 * rather than sharing global queues.
57 * -- Added support for break signals.
59 * (7/25/2000) pberger
60 * -- Added USB-2 support. Note: the USB-2 supports 3 devices: two
61 * serial and a parallel port. The parallel port is implemented
62 * as a serial-to-parallel converter. That is, the driver actually
63 * presents all three USB-2 interfaces as serial ports, but the third
64 * one physically connects to a parallel device. Thus, for example,
65 * one could plug a parallel printer into the USB-2's third port,
66 * but from the kernel's (and userland's) point of view what's
67 * actually out there is a serial device.
69 * (7/15/2000) borchers
70 * -- Fixed race in open when a close is in progress.
71 * -- Keep count of opens and dec the module use count for each
72 * outstanding open when shutdown is called (on disconnect).
73 * -- Fixed sanity checks in read_bulk_callback and write_bulk_callback
74 * so pointers are checked before use.
75 * -- Split read bulk callback into in band and out of band
76 * callbacks, and no longer restart read chains if there is
77 * a status error or a sanity error. This fixed the seg
78 * faults and other errors we used to get on disconnect.
79 * -- Port->active is once again a flag as usb-serial intended it
80 * to be, not a count. Since it was only a char it would
81 * have been limited to 256 simultaneous opens. Now the open
82 * count is kept in the port private structure in dp_open_count.
83 * -- Added code for modularization of the digi_acceleport driver.
85 * (6/27/2000) pberger and borchers
86 * -- Zeroed out sync field in the wakeup_task before first use;
87 * otherwise the uninitialized value might prevent the task from
88 * being scheduled.
89 * -- Initialized ret value to 0 in write_bulk_callback, otherwise
90 * the uninitialized value could cause a spurious debugging message.
92 * (6/22/2000) pberger and borchers
93 * -- Made cond_wait_... inline--apparently on SPARC the flags arg
94 * to spin_lock_irqsave cannot be passed to another function
95 * to call spin_unlock_irqrestore. Thanks to Pauline Middelink.
96 * -- In digi_set_modem_signals the inner nested spin locks use just
97 * spin_lock() rather than spin_lock_irqsave(). The old code
98 * mistakenly left interrupts off. Thanks to Pauline Middelink.
99 * -- copy_from_user (which can sleep) is no longer called while a
100 * spinlock is held. We copy to a local buffer before getting
101 * the spinlock--don't like the extra copy but the code is simpler.
102 * -- Printk and dbg are no longer called while a spin lock is held.
104 * (6/4/2000) pberger and borchers
105 * -- Replaced separate calls to spin_unlock_irqrestore and
106 * interruptible_sleep_on_timeout with a new function
107 * cond_wait_interruptible_timeout_irqrestore. This eliminates
108 * the race condition where the wake up could happen after
109 * the unlock and before the sleep.
110 * -- Close now waits for output to drain.
111 * -- Open waits until any close in progress is finished.
112 * -- All out of band responses are now processed, not just the
113 * first in a USB packet.
114 * -- Fixed a bug that prevented the driver from working when the
115 * first Digi port was not the first USB serial port--the driver
116 * was mistakenly using the external USB serial port number to
117 * try to index into its internal ports.
118 * -- Fixed an SMP bug -- write_bulk_callback is called directly from
119 * an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are
120 * needed for locks outside write_bulk_callback that are also
121 * acquired by write_bulk_callback to prevent deadlocks.
122 * -- Fixed support for select() by making digi_chars_in_buffer()
123 * return 256 when -EINPROGRESS is set, as the line discipline
124 * code in n_tty.c expects.
125 * -- Fixed an include file ordering problem that prevented debugging
126 * messages from working.
127 * -- Fixed an intermittent timeout problem that caused writes to
128 * sometimes get stuck on some machines on some kernels. It turns
129 * out in these circumstances write_chan() (in n_tty.c) was
130 * asleep waiting for our wakeup call. Even though we call
131 * wake_up_interruptible() in digi_write_bulk_callback(), there is
132 * a race condition that could cause the wakeup to fail: if our
133 * wake_up_interruptible() call occurs between the time that our
134 * driver write routine finishes and write_chan() sets current->state
135 * to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state
136 * to TASK_RUNNING will be lost and write_chan's subsequent call to
137 * schedule() will never return (unless it catches a signal).
138 * This race condition occurs because write_bulk_callback() (and thus
139 * the wakeup) are called asynchonously from an interrupt, rather than
140 * from the scheduler. We can avoid the race by calling the wakeup
141 * from the scheduler queue and that's our fix: Now, at the end of
142 * write_bulk_callback() we queue up a wakeup call on the scheduler
143 * task queue. We still also invoke the wakeup directly since that
144 * squeezes a bit more performance out of the driver, and any lost
145 * race conditions will get cleaned up at the next scheduler run.
147 * NOTE: The problem also goes away if you comment out
148 * the two code lines in write_chan() where current->state
149 * is set to TASK_RUNNING just before calling driver.write() and to
150 * TASK_INTERRUPTIBLE immediately afterwards. This is why the
151 * problem did not show up with the 2.2 kernels -- they do not
152 * include that code.
154 * (5/16/2000) pberger and borchers
155 * -- Added timeouts to sleeps, to defend against lost wake ups.
156 * -- Handle transition to/from B0 baud rate in digi_set_termios.
158 * (5/13/2000) pberger and borchers
159 * -- All commands now sent on out of band port, using
160 * digi_write_oob_command.
161 * -- Get modem control signals whenever they change, support TIOCMGET/
162 * SET/BIS/BIC ioctls.
163 * -- digi_set_termios now supports parity, word size, stop bits, and
164 * receive enable.
165 * -- Cleaned up open and close, use digi_set_termios and
166 * digi_write_oob_command to set port parameters.
167 * -- Added digi_startup_device to start read chains on all ports.
168 * -- Write buffer is only used when count==1, to be sure put_char can
169 * write a char (unless the buffer is full).
171 * (5/10/2000) pberger and borchers
172 * -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close.
173 * -- Fixed problem where the first incoming character is lost on
174 * port opens after the first close on that port. Now we keep
175 * the read_urb chain open until shutdown.
176 * -- Added more port conditioning calls in digi_open and digi_close.
177 * -- Convert port->active to a use count so that we can deal with multiple
178 * opens and closes properly.
179 * -- Fixed some problems with the locking code.
181 * (5/3/2000) pberger and borchers
182 * -- First alpha version of the driver--many known limitations and bugs.
185 * Locking and SMP
187 * - Each port, including the out-of-band port, has a lock used to
188 * serialize all access to the port's private structure.
189 * - The port lock is also used to serialize all writes and access to
190 * the port's URB.
191 * - The port lock is also used for the port write_wait condition
192 * variable. Holding the port lock will prevent a wake up on the
193 * port's write_wait; this can be used with cond_wait_... to be sure
194 * the wake up is not lost in a race when dropping the lock and
195 * sleeping waiting for the wakeup.
196 * - digi_write() does not sleep, since it is sometimes called on
197 * interrupt time.
198 * - digi_write_bulk_callback() and digi_read_bulk_callback() are
199 * called directly from interrupts. Hence spin_lock_irqsave()
200 * and spin_lock_irqrestore() are used in the rest of the code
201 * for any locks they acquire.
202 * - digi_write_bulk_callback() gets the port lock before waking up
203 * processes sleeping on the port write_wait. It also schedules
204 * wake ups so they happen from the scheduler, because the tty
205 * system can miss wake ups from interrupts.
206 * - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to
207 * recheck the condition they are sleeping on. This is defensive,
208 * in case a wake up is lost.
209 * - Following Documentation/DocBook/kernel-locking.pdf no spin locks
210 * are held when calling copy_to/from_user or printk.
212 * $Id: digi_acceleport.c,v 1.80 2000/08/09 06:36:18 root Exp $
215 #include <linux/config.h>
216 #include <linux/kernel.h>
217 #include <linux/sched.h>
218 #include <linux/signal.h>
219 #include <linux/errno.h>
220 #include <linux/poll.h>
221 #include <linux/init.h>
222 #include <linux/malloc.h>
223 #include <linux/fcntl.h>
224 #include <linux/tty_driver.h>
225 #include <linux/tty_flip.h>
226 #include <linux/tty.h>
227 #include <linux/module.h>
228 #include <linux/spinlock.h>
229 #include <linux/tqueue.h>
231 #ifdef CONFIG_USB_SERIAL_DEBUG
232 #define DEBUG
233 #else
234 #undef DEBUG
235 #endif
237 #include <linux/usb.h>
238 #include "usb-serial.h"
241 /* Defines */
243 /* port output buffer length -- must be <= transfer buffer length - 2 */
244 /* so we can be sure to send the full buffer in one urb */
245 #define DIGI_OUT_BUF_SIZE 8
247 /* port input buffer length -- must be >= transfer buffer length - 3 */
248 /* so we can be sure to hold at least one full buffer from one urb */
249 #define DIGI_IN_BUF_SIZE 64
251 /* retry timeout while sleeping */
252 #define DIGI_RETRY_TIMEOUT (HZ/10)
254 /* timeout while waiting for tty output to drain in close */
255 /* this delay is used twice in close, so the total delay could */
256 /* be twice this value */
257 #define DIGI_CLOSE_TIMEOUT (5*HZ)
260 /* AccelePort USB Defines */
262 /* ids */
263 #define DIGI_VENDOR_ID 0x05c5
264 #define DIGI_2_ID 0x0002 /* USB-2 */
265 #define DIGI_4_ID 0x0004 /* USB-4 */
267 /* commands
268 * "INB": can be used on the in-band endpoint
269 * "OOB": can be used on the out-of-band endpoint
271 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
272 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
273 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
274 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
275 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
276 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
277 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
278 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
279 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
280 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
281 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
282 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
283 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
284 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
285 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
286 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
287 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
288 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
289 #define DIGI_CMD_SEND_DATA 18 /* INB */
290 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
291 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
292 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
294 /* baud rates */
295 #define DIGI_BAUD_50 0
296 #define DIGI_BAUD_75 1
297 #define DIGI_BAUD_110 2
298 #define DIGI_BAUD_150 3
299 #define DIGI_BAUD_200 4
300 #define DIGI_BAUD_300 5
301 #define DIGI_BAUD_600 6
302 #define DIGI_BAUD_1200 7
303 #define DIGI_BAUD_1800 8
304 #define DIGI_BAUD_2400 9
305 #define DIGI_BAUD_4800 10
306 #define DIGI_BAUD_7200 11
307 #define DIGI_BAUD_9600 12
308 #define DIGI_BAUD_14400 13
309 #define DIGI_BAUD_19200 14
310 #define DIGI_BAUD_28800 15
311 #define DIGI_BAUD_38400 16
312 #define DIGI_BAUD_57600 17
313 #define DIGI_BAUD_76800 18
314 #define DIGI_BAUD_115200 19
315 #define DIGI_BAUD_153600 20
316 #define DIGI_BAUD_230400 21
317 #define DIGI_BAUD_460800 22
319 /* arguments */
320 #define DIGI_WORD_SIZE_5 0
321 #define DIGI_WORD_SIZE_6 1
322 #define DIGI_WORD_SIZE_7 2
323 #define DIGI_WORD_SIZE_8 3
325 #define DIGI_PARITY_NONE 0
326 #define DIGI_PARITY_ODD 1
327 #define DIGI_PARITY_EVEN 2
328 #define DIGI_PARITY_MARK 3
329 #define DIGI_PARITY_SPACE 4
331 #define DIGI_STOP_BITS_1 0
332 #define DIGI_STOP_BITS_2 1
334 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
335 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
336 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
338 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
339 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
340 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
342 #define DIGI_DTR_INACTIVE 0
343 #define DIGI_DTR_ACTIVE 1
344 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
346 #define DIGI_RTS_INACTIVE 0
347 #define DIGI_RTS_ACTIVE 1
348 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
349 #define DIGI_RTS_TOGGLE 3
351 #define DIGI_FLUSH_TX 1
352 #define DIGI_FLUSH_RX 2
353 #define DIGI_RESUME_TX 4 /* clears xoff condition */
355 #define DIGI_TRANSMIT_NOT_IDLE 0
356 #define DIGI_TRANSMIT_IDLE 1
358 #define DIGI_DISABLE 0
359 #define DIGI_ENABLE 1
361 #define DIGI_DEASSERT 0
362 #define DIGI_ASSERT 1
364 /* in band status codes */
365 #define DIGI_OVERRUN_ERROR 4
366 #define DIGI_PARITY_ERROR 8
367 #define DIGI_FRAMING_ERROR 16
368 #define DIGI_BREAK_ERROR 32
370 /* out of band status */
371 #define DIGI_NO_ERROR 0
372 #define DIGI_BAD_FIRST_PARAMETER 1
373 #define DIGI_BAD_SECOND_PARAMETER 2
374 #define DIGI_INVALID_LINE 3
375 #define DIGI_INVALID_OPCODE 4
377 /* input signals */
378 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
379 #define DIGI_READ_INPUT_SIGNALS_ERR 2
380 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
381 #define DIGI_READ_INPUT_SIGNALS_PE 8
382 #define DIGI_READ_INPUT_SIGNALS_CTS 16
383 #define DIGI_READ_INPUT_SIGNALS_DSR 32
384 #define DIGI_READ_INPUT_SIGNALS_RI 64
385 #define DIGI_READ_INPUT_SIGNALS_DCD 128
388 /* macros */
389 #define MAX(a,b) (((a)>(b))?(a):(b))
390 #define MIN(a,b) (((a)<(b))?(a):(b))
393 /* Structures */
395 typedef struct digi_serial {
396 spinlock_t ds_serial_lock;
397 struct usb_serial_port *ds_oob_port; /* out-of-band port */
398 int ds_oob_port_num; /* index of out-of-band port */
399 int ds_device_started;
400 } digi_serial_t;
402 typedef struct digi_port {
403 spinlock_t dp_port_lock;
404 int dp_port_num;
405 int dp_out_buf_len;
406 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
407 int dp_in_buf_len;
408 unsigned char dp_in_buf[DIGI_IN_BUF_SIZE];
409 unsigned char dp_in_flag_buf[DIGI_IN_BUF_SIZE];
410 unsigned int dp_modem_signals;
411 wait_queue_head_t dp_modem_change_wait;
412 int dp_open_count; /* inc on open, dec on close */
413 int dp_transmit_idle;
414 wait_queue_head_t dp_transmit_idle_wait;
415 int dp_throttled;
416 int dp_throttle_restart;
417 wait_queue_head_t dp_flush_wait;
418 int dp_in_close; /* close in progress */
419 wait_queue_head_t dp_close_wait; /* wait queue for close */
420 struct tq_struct dp_wakeup_task;
421 } digi_port_t;
424 /* Local Function Declarations */
426 static void digi_wakeup_write( struct usb_serial_port *port );
427 static void digi_wakeup_write_lock( struct usb_serial_port *port );
428 static int digi_write_oob_command( struct usb_serial_port *port,
429 unsigned char *buf, int count, int interruptible );
430 static int digi_write_inb_command( struct usb_serial_port *port,
431 unsigned char *buf, int count, unsigned long timeout );
432 static int digi_set_modem_signals( struct usb_serial_port *port,
433 unsigned int modem_signals, int interruptible );
434 static int digi_transmit_idle( struct usb_serial_port *port,
435 unsigned long timeout );
436 static void digi_rx_throttle (struct usb_serial_port *port);
437 static void digi_rx_unthrottle (struct usb_serial_port *port);
438 static void digi_set_termios( struct usb_serial_port *port,
439 struct termios *old_termios );
440 static void digi_break_ctl( struct usb_serial_port *port, int break_state );
441 static int digi_ioctl( struct usb_serial_port *port, struct file *file,
442 unsigned int cmd, unsigned long arg );
443 static int digi_write( struct usb_serial_port *port, int from_user,
444 const unsigned char *buf, int count );
445 static void digi_write_bulk_callback( struct urb *urb );
446 static int digi_write_room( struct usb_serial_port *port );
447 static int digi_chars_in_buffer( struct usb_serial_port *port );
448 static int digi_open( struct usb_serial_port *port, struct file *filp );
449 static void digi_close( struct usb_serial_port *port, struct file *filp );
450 static int digi_startup_device( struct usb_serial *serial );
451 static int digi_startup( struct usb_serial *serial );
452 static void digi_shutdown( struct usb_serial *serial );
453 static void digi_read_bulk_callback( struct urb *urb );
454 static int digi_read_inb_callback( struct urb *urb );
455 static int digi_read_oob_callback( struct urb *urb );
458 /* Statics */
460 /* device info needed for the Digi serial converter */
461 static u16 digi_vendor_id = DIGI_VENDOR_ID;
462 static u16 digi_product_2_id = DIGI_2_ID; /* USB 2 */
463 static u16 digi_product_4_id = DIGI_4_ID; /* USB 4 */
465 static struct usb_serial_device_type digi_acceleport_2_device = {
466 name: "Digi USB",
467 idVendor: &digi_vendor_id,
468 idProduct: &digi_product_2_id,
469 needs_interrupt_in: DONT_CARE,
470 needs_bulk_in: MUST_HAVE,
471 needs_bulk_out: MUST_HAVE,
472 num_interrupt_in: 0,
473 num_bulk_in: 4,
474 num_bulk_out: 4,
475 num_ports: 3,
476 open: digi_open,
477 close: digi_close,
478 write: digi_write,
479 write_room: digi_write_room,
480 write_bulk_callback: digi_write_bulk_callback,
481 read_bulk_callback: digi_read_bulk_callback,
482 chars_in_buffer: digi_chars_in_buffer,
483 throttle: digi_rx_throttle,
484 unthrottle: digi_rx_unthrottle,
485 ioctl: digi_ioctl,
486 set_termios: digi_set_termios,
487 break_ctl: digi_break_ctl,
488 startup: digi_startup,
489 shutdown: digi_shutdown,
492 static struct usb_serial_device_type digi_acceleport_4_device = {
493 name: "Digi USB",
494 idVendor: &digi_vendor_id,
495 idProduct: &digi_product_4_id,
496 needs_interrupt_in: DONT_CARE,
497 needs_bulk_in: MUST_HAVE,
498 needs_bulk_out: MUST_HAVE,
499 num_interrupt_in: 0,
500 num_bulk_in: 5,
501 num_bulk_out: 5,
502 num_ports: 4,
503 open: digi_open,
504 close: digi_close,
505 write: digi_write,
506 write_room: digi_write_room,
507 write_bulk_callback: digi_write_bulk_callback,
508 read_bulk_callback: digi_read_bulk_callback,
509 chars_in_buffer: digi_chars_in_buffer,
510 throttle: digi_rx_throttle,
511 unthrottle: digi_rx_unthrottle,
512 ioctl: digi_ioctl,
513 set_termios: digi_set_termios,
514 break_ctl: digi_break_ctl,
515 startup: digi_startup,
516 shutdown: digi_shutdown,
520 /* Functions */
523 * Cond Wait Interruptible Timeout Irqrestore
525 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
526 * so that wake ups are not lost if they occur between the unlock
527 * and the sleep. In other words, spin_lock_irqrestore and
528 * interruptible_sleep_on_timeout are "atomic" with respect to
529 * wake ups. This is used to implement condition variables.
532 static inline long cond_wait_interruptible_timeout_irqrestore(
533 wait_queue_head_t *q, long timeout,
534 spinlock_t *lock, unsigned long flags )
537 wait_queue_t wait;
540 init_waitqueue_entry( &wait, current );
542 set_current_state( TASK_INTERRUPTIBLE );
544 add_wait_queue( q, &wait );
546 spin_unlock_irqrestore( lock, flags );
548 timeout = schedule_timeout(timeout);
550 set_current_state( TASK_RUNNING );
552 remove_wait_queue( q, &wait );
554 return( timeout );
560 * Digi Wakeup Write
562 * Wake up port, line discipline, and tty processes sleeping
563 * on writes.
566 static void digi_wakeup_write_lock( struct usb_serial_port *port )
569 unsigned long flags;
570 digi_port_t *priv = (digi_port_t *)(port->private);
573 spin_lock_irqsave( &priv->dp_port_lock, flags );
574 digi_wakeup_write( port );
575 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
579 static void digi_wakeup_write( struct usb_serial_port *port )
582 struct tty_struct *tty = port->tty;
585 /* wake up port processes */
586 wake_up_interruptible( &port->write_wait );
588 /* wake up line discipline */
589 if( (tty->flags & (1 << TTY_DO_WRITE_WAKEUP))
590 && tty->ldisc.write_wakeup )
591 (tty->ldisc.write_wakeup)(tty);
593 /* wake up other tty processes */
594 wake_up_interruptible( &tty->write_wait );
595 /* For 2.2.16 backport -- wake_up_interruptible( &tty->poll_wait ); */
601 * Digi Write OOB Command
603 * Write commands on the out of band port. Commands are 4
604 * bytes each, multiple commands can be sent at once, and
605 * no command will be split across USB packets. Returns 0
606 * if successful, -EINTR if interrupted while sleeping and
607 * the interruptible flag is true, or a negative error
608 * returned by usb_submit_urb.
611 static int digi_write_oob_command( struct usb_serial_port *port,
612 unsigned char *buf, int count, int interruptible )
615 int ret = 0;
616 int len;
617 struct usb_serial_port *oob_port = (struct usb_serial_port *)((digi_serial_t *)port->serial->private)->ds_oob_port;
618 digi_port_t *oob_priv = (digi_port_t *)oob_port->private;
619 unsigned long flags = 0;
622 dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count );
624 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
626 while( count > 0 ) {
628 while( oob_port->write_urb->status == -EINPROGRESS ) {
629 cond_wait_interruptible_timeout_irqrestore(
630 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
631 &oob_priv->dp_port_lock, flags );
632 if( interruptible && signal_pending(current) ) {
633 return( -EINTR );
635 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
638 /* len must be a multiple of 4, so commands are not split */
639 len = MIN( count, oob_port->bulk_out_size );
640 if( len > 4 )
641 len &= ~3;
643 memcpy( oob_port->write_urb->transfer_buffer, buf, len );
644 oob_port->write_urb->transfer_buffer_length = len;
646 if( (ret=usb_submit_urb(oob_port->write_urb)) == 0 ) {
647 count -= len;
648 buf += len;
653 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );
655 if( ret ) {
656 err( __FUNCTION__ ": usb_submit_urb failed, ret=%d",
657 ret );
660 return( ret );
666 * Digi Write In Band Command
668 * Write commands on the given port. Commands are 4
669 * bytes each, multiple commands can be sent at once, and
670 * no command will be split across USB packets. If timeout
671 * is non-zero, write in band command will return after
672 * waiting unsuccessfully for the URB status to clear for
673 * timeout ticks. Returns 0 if successful, or a negative
674 * error returned by digi_write.
677 static int digi_write_inb_command( struct usb_serial_port *port,
678 unsigned char *buf, int count, unsigned long timeout )
681 int ret = 0;
682 int len;
683 digi_port_t *priv = (digi_port_t *)(port->private);
684 unsigned char *data = port->write_urb->transfer_buffer;
685 unsigned long flags = 0;
688 dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv->dp_port_num,
689 count );
691 if( timeout )
692 timeout += jiffies;
693 else
694 timeout = ULONG_MAX;
696 spin_lock_irqsave( &priv->dp_port_lock, flags );
698 while( count > 0 && ret == 0 ) {
700 while( port->write_urb->status == -EINPROGRESS
701 && jiffies < timeout ) {
702 cond_wait_interruptible_timeout_irqrestore(
703 &port->write_wait, DIGI_RETRY_TIMEOUT,
704 &priv->dp_port_lock, flags );
705 if( signal_pending(current) ) {
706 return( -EINTR );
708 spin_lock_irqsave( &priv->dp_port_lock, flags );
711 /* len must be a multiple of 4 and small enough to */
712 /* guarantee the write will send buffered data first, */
713 /* so commands are in order with data and not split */
714 len = MIN( count, port->bulk_out_size-2-priv->dp_out_buf_len );
715 if( len > 4 )
716 len &= ~3;
718 /* write any buffered data first */
719 if( priv->dp_out_buf_len > 0 ) {
720 data[0] = DIGI_CMD_SEND_DATA;
721 data[1] = priv->dp_out_buf_len;
722 memcpy( data+2, priv->dp_out_buf,
723 priv->dp_out_buf_len );
724 memcpy( data+2+priv->dp_out_buf_len, buf, len );
725 port->write_urb->transfer_buffer_length
726 = priv->dp_out_buf_len+2+len;
727 } else {
728 memcpy( data, buf, len );
729 port->write_urb->transfer_buffer_length = len;
732 if( (ret=usb_submit_urb(port->write_urb)) == 0 ) {
733 priv->dp_out_buf_len = 0;
734 count -= len;
735 buf += len;
740 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
742 if( ret ) {
743 err( __FUNCTION__ ": usb_submit_urb failed, ret=%d, port=%d",
744 ret, priv->dp_port_num );
747 return( ret );
753 * Digi Set Modem Signals
755 * Sets or clears DTR and RTS on the port, according to the
756 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
757 * for the modem_signals argument. Returns 0 if successful,
758 * -EINTR if interrupted while sleeping, or a non-zero error
759 * returned by usb_submit_urb.
762 static int digi_set_modem_signals( struct usb_serial_port *port,
763 unsigned int modem_signals, int interruptible )
766 int ret;
767 digi_port_t *port_priv = (digi_port_t *)port->private;
768 struct usb_serial_port *oob_port = (struct usb_serial_port *)((digi_serial_t *)port->serial->private)->ds_oob_port;
769 digi_port_t *oob_priv = (digi_port_t *)oob_port->private;
770 unsigned char *data = oob_port->write_urb->transfer_buffer;
771 unsigned long flags = 0;
774 dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
775 port_priv->dp_port_num, modem_signals );
777 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
778 spin_lock( &port_priv->dp_port_lock );
780 while( oob_port->write_urb->status == -EINPROGRESS ) {
781 spin_unlock( &port_priv->dp_port_lock );
782 cond_wait_interruptible_timeout_irqrestore(
783 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
784 &oob_priv->dp_port_lock, flags );
785 if( interruptible && signal_pending(current) ) {
786 return( -EINTR );
788 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
789 spin_lock( &port_priv->dp_port_lock );
792 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
793 data[1] = port_priv->dp_port_num;
794 data[2] = (modem_signals&TIOCM_DTR) ?
795 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
796 data[3] = 0;
798 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
799 data[5] = port_priv->dp_port_num;
800 data[6] = (modem_signals&TIOCM_RTS) ?
801 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
802 data[7] = 0;
804 oob_port->write_urb->transfer_buffer_length = 8;
806 if( (ret=usb_submit_urb(oob_port->write_urb)) == 0 ) {
807 port_priv->dp_modem_signals =
808 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
809 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
812 spin_unlock( &port_priv->dp_port_lock );
813 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );
815 if( ret ) {
816 err( __FUNCTION__ ": usb_submit_urb failed, ret=%d",
817 ret );
820 return( ret );
826 * Digi Transmit Idle
828 * Digi transmit idle waits, up to timeout ticks, for the transmitter
829 * to go idle. It returns 0 if successful or a negative error.
831 * There are race conditions here if more than one process is calling
832 * digi_transmit_idle on the same port at the same time. However, this
833 * is only called from close, and only one process can be in close on a
834 * port at a time, so its ok.
837 static int digi_transmit_idle( struct usb_serial_port *port,
838 unsigned long timeout )
841 int ret;
842 unsigned char buf[2];
843 digi_port_t *priv = (digi_port_t *)(port->private);
844 unsigned long flags = 0;
847 spin_lock_irqsave( &priv->dp_port_lock, flags );
848 priv->dp_transmit_idle = 0;
849 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
851 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
852 buf[1] = 0;
854 timeout += jiffies;
856 if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 )
857 return( ret );
859 spin_lock_irqsave( &priv->dp_port_lock, flags );
861 while( jiffies < timeout && !priv->dp_transmit_idle ) {
862 cond_wait_interruptible_timeout_irqrestore(
863 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
864 &priv->dp_port_lock, flags );
865 if( signal_pending(current) ) {
866 return( -EINTR );
868 spin_lock_irqsave( &priv->dp_port_lock, flags );
871 priv->dp_transmit_idle = 0;
872 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
874 return( 0 );
879 static void digi_rx_throttle( struct usb_serial_port *port )
882 unsigned long flags;
883 digi_port_t *priv = (digi_port_t *)(port->private);
886 dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num );
888 /* stop receiving characters by not resubmitting the read urb */
889 spin_lock_irqsave( &priv->dp_port_lock, flags );
890 priv->dp_throttled = 1;
891 priv->dp_throttle_restart = 0;
892 priv->dp_in_buf_len = 0;
893 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
898 static void digi_rx_unthrottle( struct usb_serial_port *port )
901 int ret = 0;
902 int len;
903 unsigned long flags;
904 digi_port_t *priv = (digi_port_t *)(port->private);
905 struct tty_struct *tty = port->tty;
908 dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num );
910 spin_lock_irqsave( &priv->dp_port_lock, flags );
912 /* send any buffered chars from throttle time on to tty subsystem */
913 len = MIN( priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count );
914 if( len > 0 ) {
915 memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len );
916 memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len );
917 tty->flip.char_buf_ptr += len;
918 tty->flip.flag_buf_ptr += len;
919 tty->flip.count += len;
920 tty_flip_buffer_push( tty );
923 /* restart read chain */
924 if( priv->dp_throttle_restart )
925 ret = usb_submit_urb( port->read_urb );
927 /* turn throttle off */
928 priv->dp_throttled = 0;
929 priv->dp_in_buf_len = 0;
930 priv->dp_throttle_restart = 0;
932 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
934 if( ret ) {
935 err( __FUNCTION__ ": usb_submit_urb failed, ret=%d, port=%d",
936 ret, priv->dp_port_num );
942 static void digi_set_termios( struct usb_serial_port *port,
943 struct termios *old_termios )
946 digi_port_t *priv = (digi_port_t *)(port->private);
947 unsigned int iflag = port->tty->termios->c_iflag;
948 unsigned int cflag = port->tty->termios->c_cflag;
949 unsigned int old_iflag = old_termios->c_iflag;
950 unsigned int old_cflag = old_termios->c_cflag;
951 unsigned char buf[32];
952 unsigned int modem_signals;
953 int arg,ret;
954 int i = 0;
957 dbg( "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x", priv->dp_port_num, iflag, old_iflag, cflag, old_cflag );
959 /* set baud rate */
960 if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
962 arg = -1;
964 /* reassert DTR and (maybe) RTS on transition from B0 */
965 if( (old_cflag&CBAUD) == B0 ) {
966 /* don't set RTS if using hardware flow control */
967 /* and throttling input */
968 modem_signals = TIOCM_DTR;
969 if( !(port->tty->termios->c_cflag & CRTSCTS) ||
970 !test_bit(TTY_THROTTLED, &port->tty->flags) ) {
971 modem_signals |= TIOCM_RTS;
973 digi_set_modem_signals( port, modem_signals, 1 );
976 switch( (cflag&CBAUD) ) {
977 /* drop DTR and RTS on transition to B0 */
978 case B0: digi_set_modem_signals( port, 0, 1 ); break;
979 case B50: arg = DIGI_BAUD_50; break;
980 case B75: arg = DIGI_BAUD_75; break;
981 case B110: arg = DIGI_BAUD_110; break;
982 case B150: arg = DIGI_BAUD_150; break;
983 case B200: arg = DIGI_BAUD_200; break;
984 case B300: arg = DIGI_BAUD_300; break;
985 case B600: arg = DIGI_BAUD_600; break;
986 case B1200: arg = DIGI_BAUD_1200; break;
987 case B1800: arg = DIGI_BAUD_1800; break;
988 case B2400: arg = DIGI_BAUD_2400; break;
989 case B4800: arg = DIGI_BAUD_4800; break;
990 case B9600: arg = DIGI_BAUD_9600; break;
991 case B19200: arg = DIGI_BAUD_19200; break;
992 case B38400: arg = DIGI_BAUD_38400; break;
993 case B57600: arg = DIGI_BAUD_57600; break;
994 case B115200: arg = DIGI_BAUD_115200; break;
995 case B230400: arg = DIGI_BAUD_230400; break;
996 case B460800: arg = DIGI_BAUD_460800; break;
997 default:
998 dbg( "digi_set_termios: can't handle baud rate 0x%x",
999 (cflag&CBAUD) );
1000 break;
1003 if( arg != -1 ) {
1004 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
1005 buf[i++] = priv->dp_port_num;
1006 buf[i++] = arg;
1007 buf[i++] = 0;
1012 /* set parity */
1013 if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
1015 if( (cflag&PARENB) ) {
1016 if( (cflag&PARODD) )
1017 arg = DIGI_PARITY_ODD;
1018 else
1019 arg = DIGI_PARITY_EVEN;
1020 } else {
1021 arg = DIGI_PARITY_NONE;
1024 buf[i++] = DIGI_CMD_SET_PARITY;
1025 buf[i++] = priv->dp_port_num;
1026 buf[i++] = arg;
1027 buf[i++] = 0;
1031 /* set word size */
1032 if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
1034 arg = -1;
1036 switch( (cflag&CSIZE) ) {
1037 case CS5: arg = DIGI_WORD_SIZE_5; break;
1038 case CS6: arg = DIGI_WORD_SIZE_6; break;
1039 case CS7: arg = DIGI_WORD_SIZE_7; break;
1040 case CS8: arg = DIGI_WORD_SIZE_8; break;
1041 default:
1042 dbg( "digi_set_termios: can't handle word size %d",
1043 (cflag&CSIZE) );
1044 break;
1047 if( arg != -1 ) {
1048 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1049 buf[i++] = priv->dp_port_num;
1050 buf[i++] = arg;
1051 buf[i++] = 0;
1056 /* set stop bits */
1057 if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
1059 if( (cflag&CSTOPB) )
1060 arg = DIGI_STOP_BITS_2;
1061 else
1062 arg = DIGI_STOP_BITS_1;
1064 buf[i++] = DIGI_CMD_SET_STOP_BITS;
1065 buf[i++] = priv->dp_port_num;
1066 buf[i++] = arg;
1067 buf[i++] = 0;
1071 /* set input flow control */
1072 if( (iflag&IXOFF) != (old_iflag&IXOFF)
1073 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
1075 arg = 0;
1077 if( (iflag&IXOFF) )
1078 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1079 else
1080 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1082 if( (cflag&CRTSCTS) ) {
1084 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1086 /* On USB-4 it is necessary to assert RTS prior */
1087 /* to selecting RTS input flow control. */
1088 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1089 buf[i++] = priv->dp_port_num;
1090 buf[i++] = DIGI_RTS_ACTIVE;
1091 buf[i++] = 0;
1093 } else {
1094 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1097 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1098 buf[i++] = priv->dp_port_num;
1099 buf[i++] = arg;
1100 buf[i++] = 0;
1104 /* set output flow control */
1105 if( (iflag&IXON) != (old_iflag&IXON)
1106 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
1108 arg = 0;
1110 if( (iflag&IXON) )
1111 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1112 else
1113 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1115 if( (cflag&CRTSCTS) ) {
1116 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1117 } else {
1118 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1119 port->tty->hw_stopped = 0;
1122 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1123 buf[i++] = priv->dp_port_num;
1124 buf[i++] = arg;
1125 buf[i++] = 0;
1129 /* set receive enable/disable */
1130 if( (cflag&CREAD) != (old_cflag&CREAD) ) {
1132 if( (cflag&CREAD) )
1133 arg = DIGI_ENABLE;
1134 else
1135 arg = DIGI_DISABLE;
1137 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1138 buf[i++] = priv->dp_port_num;
1139 buf[i++] = arg;
1140 buf[i++] = 0;
1144 if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 )
1145 dbg( "digi_set_termios: write oob failed, ret=%d", ret );
1150 static void digi_break_ctl( struct usb_serial_port *port, int break_state )
1153 unsigned char buf[4];
1156 buf[0] = DIGI_CMD_BREAK_CONTROL;
1157 buf[1] = 2; /* length */
1158 buf[2] = break_state ? 1 : 0;
1159 buf[3] = 0; /* pad */
1161 digi_write_inb_command( port, buf, 4, 0 );
1166 static int digi_ioctl( struct usb_serial_port *port, struct file *file,
1167 unsigned int cmd, unsigned long arg )
1170 digi_port_t *priv = (digi_port_t *)(port->private);
1171 unsigned int val;
1172 unsigned long flags = 0;
1175 dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd );
1177 switch (cmd) {
1179 case TIOCMGET:
1180 spin_lock_irqsave( &priv->dp_port_lock, flags );
1181 val = priv->dp_modem_signals;
1182 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1183 if( copy_to_user((unsigned int *)arg, &val, sizeof(int)) )
1184 return( -EFAULT );
1185 return( 0 );
1187 case TIOCMSET:
1188 case TIOCMBIS:
1189 case TIOCMBIC:
1190 if( copy_from_user(&val, (unsigned int *)arg, sizeof(int)) )
1191 return( -EFAULT );
1192 spin_lock_irqsave( &priv->dp_port_lock, flags );
1193 if( cmd == TIOCMBIS )
1194 val = priv->dp_modem_signals | val;
1195 else if( cmd == TIOCMBIC )
1196 val = priv->dp_modem_signals & ~val;
1197 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1198 return( digi_set_modem_signals( port, val, 1 ) );
1200 case TIOCMIWAIT:
1201 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
1202 /* TODO */
1203 return( 0 );
1205 case TIOCGICOUNT:
1206 /* return count of modemline transitions */
1207 /* TODO */
1208 return 0;
1212 return( -ENOIOCTLCMD );
1217 static int digi_write( struct usb_serial_port *port, int from_user,
1218 const unsigned char *buf, int count )
1221 int ret,data_len,new_len;
1222 digi_port_t *priv = (digi_port_t *)(port->private);
1223 unsigned char *data = port->write_urb->transfer_buffer;
1224 unsigned char user_buf[64]; /* 64 bytes is max USB bulk packet */
1225 unsigned long flags = 0;
1228 dbg( "digi_write: TOP: port=%d, count=%d, from_user=%d, in_interrupt=%d",
1229 priv->dp_port_num, count, from_user, in_interrupt() );
1231 /* copy user data (which can sleep) before getting spin lock */
1232 count = MIN( 64, MIN( count, port->bulk_out_size-2 ) );
1233 if( from_user && copy_from_user( user_buf, buf, count ) ) {
1234 return( -EFAULT );
1237 /* be sure only one write proceeds at a time */
1238 /* there are races on the port private buffer */
1239 /* and races to check write_urb->status */
1240 spin_lock_irqsave( &priv->dp_port_lock, flags );
1242 /* wait for urb status clear to submit another urb */
1243 if( port->write_urb->status == -EINPROGRESS ) {
1245 /* buffer data if count is 1 (probably put_char) if possible */
1246 if( count == 1 ) {
1247 new_len = MIN( count,
1248 DIGI_OUT_BUF_SIZE-priv->dp_out_buf_len );
1249 memcpy( priv->dp_out_buf+priv->dp_out_buf_len, buf,
1250 new_len );
1251 priv->dp_out_buf_len += new_len;
1252 } else {
1253 new_len = 0;
1256 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1258 return( new_len );
1262 /* allow space for any buffered data and for new data, up to */
1263 /* transfer buffer size - 2 (for command and length bytes) */
1264 new_len = MIN( count, port->bulk_out_size-2-priv->dp_out_buf_len );
1265 data_len = new_len + priv->dp_out_buf_len;
1267 if( data_len == 0 ) {
1268 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1269 return( 0 );
1272 port->write_urb->transfer_buffer_length = data_len+2;
1274 *data++ = DIGI_CMD_SEND_DATA;
1275 *data++ = data_len;
1277 /* copy in buffered data first */
1278 memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len );
1279 data += priv->dp_out_buf_len;
1281 /* copy in new data */
1282 memcpy( data, from_user ? user_buf : buf, new_len );
1284 if( (ret=usb_submit_urb(port->write_urb)) == 0 ) {
1285 ret = new_len;
1286 priv->dp_out_buf_len = 0;
1289 /* return length of new data written, or error */
1290 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1291 if( ret < 0 ) {
1292 err( __FUNCTION__ ": usb_submit_urb failed, ret=%d, port=%d",
1293 ret, priv->dp_port_num );
1296 dbg( "digi_write: returning %d", ret );
1297 return( ret );
1302 static void digi_write_bulk_callback( struct urb *urb )
1305 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1306 struct usb_serial *serial;
1307 digi_port_t *priv;
1308 int ret = 0;
1311 dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status );
1313 /* port and serial sanity check */
1314 if( port == NULL || (priv=(digi_port_t *)(port->private)) == NULL ) {
1315 err( __FUNCTION__ ": port or port->private is NULL, status=%d",
1316 urb->status );
1317 return;
1319 serial = port->serial;
1320 if( serial == NULL || serial->private == NULL ) {
1321 err( __FUNCTION__ ": serial or serial->private is NULL, status=%d", urb->status );
1322 return;
1325 /* handle oob callback */
1326 if( priv->dp_port_num
1327 == ((digi_serial_t *)(serial->private))->ds_oob_port_num ) {
1328 dbg( "digi_write_bulk_callback: oob callback" );
1329 spin_lock( &priv->dp_port_lock );
1330 wake_up_interruptible( &port->write_wait );
1331 spin_unlock( &priv->dp_port_lock );
1332 return;
1335 /* further sanity checks */
1336 if( port_paranoia_check( port, __FUNCTION__ )
1337 || serial_paranoia_check( serial, __FUNCTION__ ) )
1338 return;
1340 /* try to send any buffered data on this port, if it is open */
1341 spin_lock( &priv->dp_port_lock );
1342 if( priv->dp_open_count && port->write_urb->status != -EINPROGRESS
1343 && priv->dp_out_buf_len > 0 ) {
1345 *((unsigned char *)(port->write_urb->transfer_buffer))
1346 = (unsigned char)DIGI_CMD_SEND_DATA;
1347 *((unsigned char *)(port->write_urb->transfer_buffer)+1)
1348 = (unsigned char)priv->dp_out_buf_len;
1350 port->write_urb->transfer_buffer_length
1351 = priv->dp_out_buf_len+2;
1353 memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf,
1354 priv->dp_out_buf_len );
1356 if( (ret=usb_submit_urb(port->write_urb)) == 0 ) {
1357 priv->dp_out_buf_len = 0;
1362 /* wake up processes sleeping on writes immediately */
1363 digi_wakeup_write( port );
1365 /* also queue up a wakeup at scheduler time, in case we */
1366 /* lost the race in write_chan(). */
1367 queue_task( &priv->dp_wakeup_task, &tq_scheduler );
1369 spin_unlock( &priv->dp_port_lock );
1371 if( ret ) {
1372 err( __FUNCTION__ ": usb_submit_urb failed, ret=%d, port=%d",
1373 ret, priv->dp_port_num );
1379 static int digi_write_room( struct usb_serial_port *port )
1382 int room;
1383 digi_port_t *priv = (digi_port_t *)(port->private);
1384 unsigned long flags = 0;
1387 spin_lock_irqsave( &priv->dp_port_lock, flags );
1389 if( port->write_urb->status == -EINPROGRESS )
1390 room = 0;
1391 else
1392 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1394 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1396 dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room );
1397 return( room );
1402 static int digi_chars_in_buffer( struct usb_serial_port *port )
1405 digi_port_t *priv = (digi_port_t *)(port->private);
1408 if( port->write_urb->status == -EINPROGRESS ) {
1409 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 );
1410 /* return( port->bulk_out_size - 2 ); */
1411 return( 256 );
1412 } else {
1413 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len );
1414 return( priv->dp_out_buf_len );
1420 static int digi_open( struct usb_serial_port *port, struct file *filp )
1423 int ret;
1424 unsigned char buf[32];
1425 digi_port_t *priv = (digi_port_t *)(port->private);
1426 struct termios not_termios;
1427 unsigned long flags = 0;
1430 dbg( "digi_open: TOP: port=%d, active=%d, open_count=%d", priv->dp_port_num, port->active, priv->dp_open_count );
1432 /* be sure the device is started up */
1433 if( digi_startup_device( port->serial ) != 0 )
1434 return( -ENXIO );
1436 spin_lock_irqsave( &priv->dp_port_lock, flags );
1438 /* don't wait on a close in progress for non-blocking opens */
1439 if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1440 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1441 return( -EAGAIN );
1444 /* inc module use count before sleeping to wait for closes */
1445 ++priv->dp_open_count;
1446 MOD_INC_USE_COUNT;
1448 /* wait for a close in progress to finish */
1449 while( priv->dp_in_close ) {
1450 cond_wait_interruptible_timeout_irqrestore(
1451 &priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
1452 &priv->dp_port_lock, flags );
1453 if( signal_pending(current) ) {
1454 --priv->dp_open_count;
1455 MOD_DEC_USE_COUNT;
1456 return( -EINTR );
1458 spin_lock_irqsave( &priv->dp_port_lock, flags );
1461 /* if port is already open, just return */
1462 /* be sure exactly one open proceeds */
1463 if( port->active ) {
1464 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1465 return( 0 );
1468 /* first open, mark port as active */
1469 port->active = 1;
1470 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1472 /* read modem signals automatically whenever they change */
1473 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1474 buf[1] = priv->dp_port_num;
1475 buf[2] = DIGI_ENABLE;
1476 buf[3] = 0;
1478 /* flush fifos */
1479 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1480 buf[5] = priv->dp_port_num;
1481 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1482 buf[7] = 0;
1484 if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 )
1485 dbg( "digi_open: write oob failed, ret=%d", ret );
1487 /* set termios settings */
1488 not_termios.c_cflag = ~port->tty->termios->c_cflag;
1489 not_termios.c_iflag = ~port->tty->termios->c_iflag;
1490 digi_set_termios( port, &not_termios );
1492 /* set DTR and RTS */
1493 digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 );
1495 return( 0 );
1500 static void digi_close( struct usb_serial_port *port, struct file *filp )
1503 int ret;
1504 unsigned char buf[32];
1505 struct tty_struct *tty = port->tty;
1506 digi_port_t *priv = (digi_port_t *)port->private;
1507 unsigned long flags = 0;
1510 dbg( "digi_close: TOP: port=%d, active=%d, open_count=%d", priv->dp_port_num, port->active, priv->dp_open_count );
1513 /* do cleanup only after final close on this port */
1514 spin_lock_irqsave( &priv->dp_port_lock, flags );
1515 if( priv->dp_open_count > 1 ) {
1516 --priv->dp_open_count;
1517 MOD_DEC_USE_COUNT;
1518 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1519 return;
1520 } else if( priv->dp_open_count <= 0 ) {
1521 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1522 return;
1524 priv->dp_in_close = 1;
1525 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1527 /* tell line discipline to process only XON/XOFF */
1528 tty->closing = 1;
1530 /* wait for output to drain */
1531 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1532 tty_wait_until_sent( tty, DIGI_CLOSE_TIMEOUT );
1535 /* flush driver and line discipline buffers */
1536 if( tty->driver.flush_buffer )
1537 tty->driver.flush_buffer( tty );
1538 if( tty->ldisc.flush_buffer )
1539 tty->ldisc.flush_buffer( tty );
1541 /* wait for transmit idle */
1542 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1543 digi_transmit_idle( port, DIGI_CLOSE_TIMEOUT );
1546 /* drop DTR and RTS */
1547 digi_set_modem_signals( port, 0, 0 );
1549 /* disable input flow control */
1550 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1551 buf[1] = priv->dp_port_num;
1552 buf[2] = DIGI_DISABLE;
1553 buf[3] = 0;
1555 /* disable output flow control */
1556 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1557 buf[5] = priv->dp_port_num;
1558 buf[6] = DIGI_DISABLE;
1559 buf[7] = 0;
1561 /* disable reading modem signals automatically */
1562 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1563 buf[9] = priv->dp_port_num;
1564 buf[10] = DIGI_DISABLE;
1565 buf[11] = 0;
1567 /* disable receive */
1568 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1569 buf[13] = priv->dp_port_num;
1570 buf[14] = DIGI_DISABLE;
1571 buf[15] = 0;
1573 /* flush fifos */
1574 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1575 buf[17] = priv->dp_port_num;
1576 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1577 buf[19] = 0;
1579 if( (ret=digi_write_oob_command( port, buf, 20, 0 )) != 0 )
1580 dbg( "digi_close: write oob failed, ret=%d", ret );
1582 /* wait for final commands on oob port to complete */
1583 interruptible_sleep_on_timeout( &priv->dp_flush_wait,
1584 DIGI_CLOSE_TIMEOUT );
1586 /* shutdown any outstanding bulk writes */
1587 usb_unlink_urb (port->write_urb);
1589 tty->closing = 0;
1591 spin_lock_irqsave( &priv->dp_port_lock, flags );
1592 port->active = 0;
1593 priv->dp_in_close = 0;
1594 --priv->dp_open_count;
1595 MOD_DEC_USE_COUNT;
1596 wake_up_interruptible( &priv->dp_close_wait );
1597 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1599 dbg( "digi_close: done" );
1604 * Digi Startup Device
1606 * Starts reads on all ports. Must be called AFTER startup, with
1607 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1610 static int digi_startup_device( struct usb_serial *serial )
1613 int i,ret = 0;
1614 digi_serial_t *serial_priv = (digi_serial_t *)serial->private;
1615 struct usb_serial_port *port;
1618 /* be sure this happens exactly once */
1619 spin_lock( &serial_priv->ds_serial_lock );
1620 if( serial_priv->ds_device_started ) {
1621 spin_unlock( &serial_priv->ds_serial_lock );
1622 return( 0 );
1624 serial_priv->ds_device_started = 1;
1625 spin_unlock( &serial_priv->ds_serial_lock );
1627 /* start reading from each bulk in endpoint for the device */
1628 /* set USB_DISABLE_SPD flag for write bulk urbs */
1629 for( i=0; i<serial->type->num_ports+1; i++ ) {
1631 port = &serial->port[i];
1633 port->write_urb->transfer_flags |= USB_DISABLE_SPD;
1635 if( (ret=usb_submit_urb(port->read_urb)) != 0 ) {
1636 err(
1637 __FUNCTION__ ": usb_submit_urb failed, ret=%d, port=%d",
1638 ret, i );
1639 break;
1644 return( ret );
1649 static int digi_startup( struct usb_serial *serial )
1652 int i;
1653 digi_port_t *priv;
1654 digi_serial_t *serial_priv;
1657 dbg( "digi_startup: TOP" );
1659 /* allocate the private data structures for all ports */
1660 /* number of regular ports + 1 for the out-of-band port */
1661 for( i=0; i<serial->type->num_ports+1; i++ ) {
1663 serial->port[i].active = 0;
1665 /* allocate port private structure */
1666 priv = serial->port[i].private =
1667 (digi_port_t *)kmalloc( sizeof(digi_port_t),
1668 GFP_KERNEL );
1669 if( priv == (digi_port_t *)0 ) {
1670 while( --i >= 0 )
1671 kfree( serial->port[i].private );
1672 return( 1 ); /* error */
1675 /* initialize port private structure */
1676 spin_lock_init( &priv->dp_port_lock );
1677 priv->dp_port_num = i;
1678 priv->dp_out_buf_len = 0;
1679 priv->dp_in_buf_len = 0;
1680 priv->dp_modem_signals = 0;
1681 init_waitqueue_head( &priv->dp_modem_change_wait );
1682 priv->dp_open_count = 0;
1683 priv->dp_transmit_idle = 0;
1684 init_waitqueue_head( &priv->dp_transmit_idle_wait );
1685 priv->dp_throttled = 0;
1686 priv->dp_throttle_restart = 0;
1687 init_waitqueue_head( &priv->dp_flush_wait );
1688 priv->dp_in_close = 0;
1689 init_waitqueue_head( &priv->dp_close_wait );
1690 priv->dp_wakeup_task.next = NULL;
1691 priv->dp_wakeup_task.sync = 0;
1692 priv->dp_wakeup_task.routine = (void *)digi_wakeup_write_lock;
1693 priv->dp_wakeup_task.data = (void *)(&serial->port[i]);
1695 /* initialize write wait queue for this port */
1696 init_waitqueue_head( &serial->port[i].write_wait );
1700 /* allocate serial private structure */
1701 serial_priv = serial->private =
1702 (digi_serial_t *)kmalloc( sizeof(digi_serial_t),
1703 GFP_KERNEL );
1704 if( serial_priv == (digi_serial_t *)0 ) {
1705 for( i=0; i<serial->type->num_ports+1; i++ )
1706 kfree( serial->port[i].private );
1707 return( 1 ); /* error */
1710 /* initialize serial private structure */
1711 spin_lock_init( &serial_priv->ds_serial_lock );
1712 serial_priv->ds_oob_port_num = serial->type->num_ports;
1713 serial_priv->ds_oob_port = &serial->port[serial_priv->ds_oob_port_num];
1714 serial_priv->ds_device_started = 0;
1716 return( 0 );
1721 static void digi_shutdown( struct usb_serial *serial )
1724 int i;
1725 digi_port_t *priv;
1726 unsigned long flags;
1729 dbg( "digi_shutdown: TOP, in_interrupt()=%d", in_interrupt() );
1731 /* stop reads and writes on all ports */
1732 for( i=0; i<serial->type->num_ports+1; i++ ) {
1733 usb_unlink_urb( serial->port[i].read_urb );
1734 usb_unlink_urb( serial->port[i].write_urb );
1737 /* dec module use count */
1738 for( i=0; i<serial->type->num_ports; i++ ) {
1739 priv = serial->port[i].private;
1740 spin_lock_irqsave( &priv->dp_port_lock, flags );
1741 while( priv->dp_open_count > 0 ) {
1742 MOD_DEC_USE_COUNT;
1743 --priv->dp_open_count;
1745 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1748 /* free the private data structures for all ports */
1749 /* number of regular ports + 1 for the out-of-band port */
1750 for( i=0; i<serial->type->num_ports+1; i++ )
1751 kfree( serial->port[i].private );
1752 kfree( serial->private );
1757 static void digi_read_bulk_callback( struct urb *urb )
1760 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1761 digi_port_t *priv;
1762 int ret;
1765 dbg( "digi_read_bulk_callback: TOP" );
1767 /* port sanity check, do not resubmit if port is not valid */
1768 if( port == NULL || (priv=(digi_port_t *)(port->private)) == NULL ) {
1769 err( __FUNCTION__ ": port or port->private is NULL, status=%d",
1770 urb->status );
1771 return;
1773 if( port->serial == NULL
1774 || serial_paranoia_check( port->serial, __FUNCTION__ )
1775 || port->serial->private == NULL ) {
1776 err( __FUNCTION__ ": serial is bad or serial->private is NULL, status=%d", urb->status );
1777 return;
1780 /* do not resubmit urb if it has any status error */
1781 if( urb->status ) {
1782 err( __FUNCTION__ ": nonzero read bulk status: status=%d, port=%d", urb->status, priv->dp_port_num );
1783 return;
1786 /* handle oob or inb callback, do not resubmit if error */
1787 if( priv->dp_port_num
1788 == ((digi_serial_t *)(port->serial->private))->ds_oob_port_num ) {
1789 if( digi_read_oob_callback( urb ) != 0 )
1790 return;
1791 } else {
1792 if( digi_read_inb_callback( urb ) != 0 )
1793 return;
1796 /* continue read */
1797 if( (ret=usb_submit_urb(urb)) != 0 ) {
1798 err( __FUNCTION__ ": failed resubmitting urb, ret=%d, port=%d",
1799 ret, priv->dp_port_num );
1806 * Digi Read INB Callback
1808 * Digi Read INB Callback handles reads on the in band ports, sending
1809 * the data on to the tty subsystem. When called we know port and
1810 * port->private are not NULL and port->serial has been validated.
1811 * It returns 0 if successful, 1 if successful but the port is
1812 * throttled, and -1 if the sanity checks failed.
1815 static int digi_read_inb_callback( struct urb *urb )
1818 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1819 struct tty_struct *tty = port->tty;
1820 digi_port_t *priv = (digi_port_t *)(port->private);
1821 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1822 int len = ((unsigned char *)urb->transfer_buffer)[1];
1823 int status = ((unsigned char *)urb->transfer_buffer)[2];
1824 unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
1825 int flag,throttled;
1828 /* sanity check */
1829 if( port_paranoia_check( port, __FUNCTION__ ) )
1830 return( -1 );
1832 /* do not process callbacks on closed ports */
1833 /* but do continue the read chain */
1834 if( priv->dp_open_count == 0 )
1835 return( 0 );
1837 /* short/multiple packet check */
1838 if( urb->actual_length != len + 2 ) {
1839 err( __FUNCTION__ ": INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, port=%d, opcode=%d, len=%d, actual_length=%d, status=%d", urb->status, priv->dp_port_num, opcode, len, urb->actual_length, status );
1840 return( -1 );
1843 spin_lock( &priv->dp_port_lock );
1845 /* check for throttle; if set, do not resubmit read urb */
1846 /* indicate the read chain needs to be restarted on unthrottle */
1847 throttled = priv->dp_throttled;
1848 if( throttled )
1849 priv->dp_throttle_restart = 1;
1851 /* receive data */
1852 if( opcode == DIGI_CMD_RECEIVE_DATA ) {
1854 /* get flag from status */
1855 flag = 0;
1857 /* overrun is special, not associated with a char */
1858 if( status & DIGI_OVERRUN_ERROR ) {
1859 tty_insert_flip_char( tty, 0, TTY_OVERRUN );
1862 /* break takes precedence over parity, */
1863 /* which takes precedence over framing errors */
1864 if( status & DIGI_BREAK_ERROR ) {
1865 flag = TTY_BREAK;
1866 } else if( status & DIGI_PARITY_ERROR ) {
1867 flag = TTY_PARITY;
1868 } else if( status & DIGI_FRAMING_ERROR ) {
1869 flag = TTY_FRAME;
1872 /* data length is len-1 (one byte of len is status) */
1873 --len;
1875 if( throttled ) {
1877 len = MIN( len,
1878 DIGI_IN_BUF_SIZE - priv->dp_in_buf_len );
1880 if( len > 0 ) {
1881 memcpy( priv->dp_in_buf + priv->dp_in_buf_len,
1882 data, len );
1883 memset( priv->dp_in_flag_buf
1884 + priv->dp_in_buf_len, flag, len );
1885 priv->dp_in_buf_len += len;
1888 } else {
1890 len = MIN( len, TTY_FLIPBUF_SIZE - tty->flip.count );
1892 if( len > 0 ) {
1893 memcpy( tty->flip.char_buf_ptr, data, len );
1894 memset( tty->flip.flag_buf_ptr, flag, len );
1895 tty->flip.char_buf_ptr += len;
1896 tty->flip.flag_buf_ptr += len;
1897 tty->flip.count += len;
1898 tty_flip_buffer_push( tty );
1905 spin_unlock( &priv->dp_port_lock );
1907 if( opcode == DIGI_CMD_RECEIVE_DISABLE ) {
1908 dbg( __FUNCTION__ ": got RECEIVE_DISABLE" );
1909 } else if( opcode != DIGI_CMD_RECEIVE_DATA ) {
1910 dbg( __FUNCTION__ ": unknown opcode: %d", opcode );
1913 return( throttled ? 1 : 0 );
1919 * Digi Read OOB Callback
1921 * Digi Read OOB Callback handles reads on the out of band port.
1922 * When called we know port and port->private are not NULL and
1923 * the port->serial is valid. It returns 0 if successful, and
1924 * -1 if the sanity checks failed.
1927 static int digi_read_oob_callback( struct urb *urb )
1930 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1931 struct usb_serial *serial = port->serial;
1932 digi_port_t *priv = (digi_port_t *)(port->private);
1933 int opcode, line, status, val;
1934 int i;
1937 dbg( "digi_read_oob_callback: port=%d, len=%d", priv->dp_port_num,
1938 urb->actual_length );
1940 /* handle each oob command */
1941 for( i=0; i<urb->actual_length-3; ) {
1943 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1944 line = ((unsigned char *)urb->transfer_buffer)[i++];
1945 status = ((unsigned char *)urb->transfer_buffer)[i++];
1946 val = ((unsigned char *)urb->transfer_buffer)[i++];
1948 dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1949 opcode, line, status, val );
1951 if( status != 0 || line >= serial->type->num_ports )
1952 continue;
1954 port = &serial->port[line];
1956 if( port_paranoia_check( port, __FUNCTION__ )
1957 || (priv=port->private) == NULL )
1958 return( -1 );
1960 if( opcode == DIGI_CMD_READ_INPUT_SIGNALS ) {
1962 spin_lock( &priv->dp_port_lock );
1964 /* convert from digi flags to termiox flags */
1965 if( val & DIGI_READ_INPUT_SIGNALS_CTS ) {
1966 priv->dp_modem_signals |= TIOCM_CTS;
1967 /* port must be open to use tty struct */
1968 if( priv->dp_open_count
1969 && port->tty->termios->c_cflag & CRTSCTS ) {
1970 port->tty->hw_stopped = 0;
1971 digi_wakeup_write( port );
1973 } else {
1974 priv->dp_modem_signals &= ~TIOCM_CTS;
1975 /* port must be open to use tty struct */
1976 if( priv->dp_open_count
1977 && port->tty->termios->c_cflag & CRTSCTS ) {
1978 port->tty->hw_stopped = 1;
1981 if( val & DIGI_READ_INPUT_SIGNALS_DSR )
1982 priv->dp_modem_signals |= TIOCM_DSR;
1983 else
1984 priv->dp_modem_signals &= ~TIOCM_DSR;
1985 if( val & DIGI_READ_INPUT_SIGNALS_RI )
1986 priv->dp_modem_signals |= TIOCM_RI;
1987 else
1988 priv->dp_modem_signals &= ~TIOCM_RI;
1989 if( val & DIGI_READ_INPUT_SIGNALS_DCD )
1990 priv->dp_modem_signals |= TIOCM_CD;
1991 else
1992 priv->dp_modem_signals &= ~TIOCM_CD;
1994 wake_up_interruptible( &priv->dp_modem_change_wait );
1995 spin_unlock( &priv->dp_port_lock );
1997 } else if( opcode == DIGI_CMD_TRANSMIT_IDLE ) {
1999 spin_lock( &priv->dp_port_lock );
2000 priv->dp_transmit_idle = 1;
2001 wake_up_interruptible( &priv->dp_transmit_idle_wait );
2002 spin_unlock( &priv->dp_port_lock );
2004 } else if( opcode == DIGI_CMD_IFLUSH_FIFO ) {
2006 wake_up_interruptible( &priv->dp_flush_wait );
2012 return( 0 );
2017 static int __init digi_init (void)
2019 usb_serial_register (&digi_acceleport_2_device);
2020 usb_serial_register (&digi_acceleport_4_device);
2021 return 0;
2025 static void __exit digi_exit (void)
2027 usb_serial_deregister (&digi_acceleport_2_device);
2028 usb_serial_deregister (&digi_acceleport_4_device);
2032 module_init(digi_init);
2033 module_exit(digi_exit);
2036 MODULE_AUTHOR("Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>");
2037 MODULE_DESCRIPTION("Digi AccelePort USB-4 Serial Converter driver");