c50cec95f49bc861e993eb3fae69052bb712c561
[linux-2.6.git] / drivers / usb / serial / digi_acceleport.c
1 /*
2 *  Digi AccelePort USB-4 and USB-2 Serial Converters
3 *
4 *  Copyright 2000 by Digi International
5 *
6 *  This program is free software; you can redistribute it and/or modify
7 *  it under the terms of the GNU General Public License as published by
8 *  the Free Software Foundation; either version 2 of the License, or
9 *  (at your option) any later version.
10 *
11 *  Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
12 *  usb-serial driver.
13 *
14 *  Peter Berger (pberger@brimson.com)
15 *  Al Borchers (borchers@steinerpoint.com)
16
17 * (12/03/2001) gkh
18 *       switched to using port->open_count instead of private version.
19 *       Removed port->active
20 *
21 * (04/08/2001) gb
22 *       Identify version on module load.
23 *
24 * (11/01/2000) Adam J. Richter
25 *       usb_device_id table support
26
27 * (11/01/2000) pberger and borchers
28 *    -- Turned off the USB_DISABLE_SPD flag for write bulk urbs--it caused
29 *       USB 4 ports to hang on startup.
30 *    -- Serialized access to write urbs by adding the dp_write_urb_in_use
31 *       flag; otherwise, the driver caused SMP system hangs.  Watching the
32 *       urb status is not sufficient.
33 *
34 * (10/05/2000) gkh
35 *    -- Fixed bug with urb->dev not being set properly, now that the usb
36 *       core needs it.
37
38 *  (8/8/2000) pberger and borchers
39 *    -- Fixed close so that 
40 *       - it can timeout while waiting for transmit idle, if needed;
41 *       - it ignores interrupts when flushing the port, turning
42 *         of modem signalling, and so on;
43 *       - it waits for the flush to really complete before returning.
44 *    -- Read_bulk_callback and write_bulk_callback check for a closed
45 *       port before using the tty struct or writing to the port.
46 *    -- The two changes above fix the oops caused by interrupted closes.
47 *    -- Added interruptible args to write_oob_command and set_modem_signals
48 *       and added a timeout arg to transmit_idle; needed for fixes to
49 *       close.
50 *    -- Added code for rx_throttle and rx_unthrottle so that input flow
51 *       control works.
52 *    -- Added code to set overrun, parity, framing, and break errors
53 *       (untested).
54 *    -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length
55 *       bulk writes are done.  These hung the Digi USB device.  The
56 *       0 length bulk writes were a new feature of usb-uhci added in
57 *       the 2.4.0-test6 kernels.
58 *    -- Fixed mod inc race in open; do mod inc before sleeping to wait
59 *       for a close to finish.
60 *
61 *  (7/31/2000) pberger
62 *    -- Fixed bugs with hardware handshaking:
63 *       - Added code to set/clear tty->hw_stopped in digi_read_oob_callback()
64 *         and digi_set_termios()
65 *    -- Added code in digi_set_termios() to
66 *       - add conditional in code handling transition from B0 to only
67 *         set RTS if RTS/CTS flow control is either not in use or if
68 *         the port is not currently throttled.
69 *       - handle turning off CRTSCTS.
70 *
71 *  (7/30/2000) borchers
72 *    -- Added support for more than one Digi USB device by moving
73 *       globals to a private structure in the pointed to from the
74 *       usb_serial structure.
75 *    -- Moved the modem change and transmit idle wait queues into
76 *       the port private structure, so each port has its own queue
77 *       rather than sharing global queues.
78 *    -- Added support for break signals.
79 *
80 *  (7/25/2000) pberger
81 *    -- Added USB-2 support.  Note: the USB-2 supports 3 devices: two
82 *       serial and a parallel port.  The parallel port is implemented
83 *       as a serial-to-parallel converter.  That is, the driver actually
84 *       presents all three USB-2 interfaces as serial ports, but the third
85 *       one physically connects to a parallel device.  Thus, for example,
86 *       one could plug a parallel printer into the USB-2's third port,
87 *       but from the kernel's (and userland's) point of view what's
88 *       actually out there is a serial device.
89 *
90 *  (7/15/2000) borchers
91 *    -- Fixed race in open when a close is in progress.
92 *    -- Keep count of opens and dec the module use count for each
93 *       outstanding open when shutdown is called (on disconnect).
94 *    -- Fixed sanity checks in read_bulk_callback and write_bulk_callback
95 *       so pointers are checked before use.
96 *    -- Split read bulk callback into in band and out of band
97 *       callbacks, and no longer restart read chains if there is
98 *       a status error or a sanity error.  This fixed the seg
99 *       faults and other errors we used to get on disconnect.
100 *    -- Port->active is once again a flag as usb-serial intended it
101 *       to be, not a count.  Since it was only a char it would
102 *       have been limited to 256 simultaneous opens.  Now the open
103 *       count is kept in the port private structure in dp_open_count.
104 *    -- Added code for modularization of the digi_acceleport driver.
105 *
106 *  (6/27/2000) pberger and borchers
107 *    -- Zeroed out sync field in the wakeup_task before first use;
108 *       otherwise the uninitialized value might prevent the task from
109 *       being scheduled.
110 *    -- Initialized ret value to 0 in write_bulk_callback, otherwise
111 *       the uninitialized value could cause a spurious debugging message.
112 *
113 *  (6/22/2000) pberger and borchers
114 *    -- Made cond_wait_... inline--apparently on SPARC the flags arg
115 *       to spin_lock_irqsave cannot be passed to another function
116 *       to call spin_unlock_irqrestore.  Thanks to Pauline Middelink.
117 *    -- In digi_set_modem_signals the inner nested spin locks use just
118 *       spin_lock() rather than spin_lock_irqsave().  The old code
119 *       mistakenly left interrupts off.  Thanks to Pauline Middelink.
120 *    -- copy_from_user (which can sleep) is no longer called while a
121 *       spinlock is held.  We copy to a local buffer before getting
122 *       the spinlock--don't like the extra copy but the code is simpler.
123 *    -- Printk and dbg are no longer called while a spin lock is held.
124 *
125 *  (6/4/2000) pberger and borchers
126 *    -- Replaced separate calls to spin_unlock_irqrestore and
127 *       interruptible_sleep_on_timeout with a new function
128 *       cond_wait_interruptible_timeout_irqrestore.  This eliminates
129 *       the race condition where the wake up could happen after
130 *       the unlock and before the sleep.
131 *    -- Close now waits for output to drain.
132 *    -- Open waits until any close in progress is finished.
133 *    -- All out of band responses are now processed, not just the
134 *       first in a USB packet.
135 *    -- Fixed a bug that prevented the driver from working when the
136 *       first Digi port was not the first USB serial port--the driver
137 *       was mistakenly using the external USB serial port number to
138 *       try to index into its internal ports.
139 *    -- Fixed an SMP bug -- write_bulk_callback is called directly from
140 *       an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are
141 *       needed for locks outside write_bulk_callback that are also
142 *       acquired by write_bulk_callback to prevent deadlocks.
143 *    -- Fixed support for select() by making digi_chars_in_buffer()
144 *       return 256 when -EINPROGRESS is set, as the line discipline
145 *       code in n_tty.c expects.
146 *    -- Fixed an include file ordering problem that prevented debugging
147 *       messages from working.
148 *    -- Fixed an intermittent timeout problem that caused writes to
149 *       sometimes get stuck on some machines on some kernels.  It turns
150 *       out in these circumstances write_chan() (in n_tty.c) was
151 *       asleep waiting for our wakeup call.  Even though we call
152 *       wake_up_interruptible() in digi_write_bulk_callback(), there is
153 *       a race condition that could cause the wakeup to fail: if our
154 *       wake_up_interruptible() call occurs between the time that our
155 *       driver write routine finishes and write_chan() sets current->state
156 *       to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state
157 *       to TASK_RUNNING will be lost and write_chan's subsequent call to
158 *       schedule() will never return (unless it catches a signal).
159 *       This race condition occurs because write_bulk_callback() (and thus
160 *       the wakeup) are called asynchonously from an interrupt, rather than
161 *       from the scheduler.  We can avoid the race by calling the wakeup
162 *       from the scheduler queue and that's our fix:  Now, at the end of
163 *       write_bulk_callback() we queue up a wakeup call on the scheduler
164 *       task queue.  We still also invoke the wakeup directly since that
165 *       squeezes a bit more performance out of the driver, and any lost
166 *       race conditions will get cleaned up at the next scheduler run.
167 *
168 *       NOTE:  The problem also goes away if you comment out
169 *       the two code lines in write_chan() where current->state
170 *       is set to TASK_RUNNING just before calling driver.write() and to
171 *       TASK_INTERRUPTIBLE immediately afterwards.  This is why the
172 *       problem did not show up with the 2.2 kernels -- they do not
173 *       include that code.
174 *
175 *  (5/16/2000) pberger and borchers
176 *    -- Added timeouts to sleeps, to defend against lost wake ups.
177 *    -- Handle transition to/from B0 baud rate in digi_set_termios.
178 *
179 *  (5/13/2000) pberger and borchers
180 *    -- All commands now sent on out of band port, using
181 *       digi_write_oob_command.
182 *    -- Get modem control signals whenever they change, support TIOCMGET/
183 *       SET/BIS/BIC ioctls.
184 *    -- digi_set_termios now supports parity, word size, stop bits, and
185 *       receive enable.
186 *    -- Cleaned up open and close, use digi_set_termios and
187 *       digi_write_oob_command to set port parameters.
188 *    -- Added digi_startup_device to start read chains on all ports.
189 *    -- Write buffer is only used when count==1, to be sure put_char can
190 *       write a char (unless the buffer is full).
191 *
192 *  (5/10/2000) pberger and borchers
193 *    -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close.
194 *    -- Fixed problem where the first incoming character is lost on
195 *       port opens after the first close on that port.  Now we keep
196 *       the read_urb chain open until shutdown.
197 *    -- Added more port conditioning calls in digi_open and digi_close.
198 *    -- Convert port->active to a use count so that we can deal with multiple
199 *       opens and closes properly.
200 *    -- Fixed some problems with the locking code.
201 *
202 *  (5/3/2000) pberger and borchers
203 *    -- First alpha version of the driver--many known limitations and bugs.
204 *
205 *
206 *  Locking and SMP
207 *
208 *  - Each port, including the out-of-band port, has a lock used to
209 *    serialize all access to the port's private structure.
210 *  - The port lock is also used to serialize all writes and access to
211 *    the port's URB.
212 *  - The port lock is also used for the port write_wait condition
213 *    variable.  Holding the port lock will prevent a wake up on the
214 *    port's write_wait; this can be used with cond_wait_... to be sure
215 *    the wake up is not lost in a race when dropping the lock and
216 *    sleeping waiting for the wakeup.
217 *  - digi_write() does not sleep, since it is sometimes called on
218 *    interrupt time.
219 *  - digi_write_bulk_callback() and digi_read_bulk_callback() are
220 *    called directly from interrupts.  Hence spin_lock_irqsave()
221 *    and spin_unlock_irqrestore() are used in the rest of the code
222 *    for any locks they acquire.
223 *  - digi_write_bulk_callback() gets the port lock before waking up
224 *    processes sleeping on the port write_wait.  It also schedules
225 *    wake ups so they happen from the scheduler, because the tty
226 *    system can miss wake ups from interrupts.
227 *  - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to
228 *    recheck the condition they are sleeping on.  This is defensive,
229 *    in case a wake up is lost.
230 *  - Following Documentation/DocBook/kernel-locking.pdf no spin locks
231 *    are held when calling copy_to/from_user or printk.
232 *    
233 *  $Id: digi_acceleport.c,v 1.80.1.2 2000/11/02 05:45:08 root Exp $
234 */
235
236 #include <linux/config.h>
237 #include <linux/kernel.h>
238 #include <linux/errno.h>
239 #include <linux/init.h>
240 #include <linux/slab.h>
241 #include <linux/tty.h>
242 #include <linux/tty_driver.h>
243 #include <linux/tty_flip.h>
244 #include <linux/module.h>
245 #include <linux/spinlock.h>
246 #include <linux/workqueue.h>
247 #include <asm/uaccess.h>
248 #include <linux/usb.h>
249 #include <linux/wait.h>
250 #include "usb-serial.h"
251
252 /* Defines */
253
254 /*
255  * Version Information
256  */
257 #define DRIVER_VERSION "v1.80.1.2"
258 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
259 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
260
261 /* port output buffer length -- must be <= transfer buffer length - 2 */
262 /* so we can be sure to send the full buffer in one urb */
263 #define DIGI_OUT_BUF_SIZE               8
264
265 /* port input buffer length -- must be >= transfer buffer length - 3 */
266 /* so we can be sure to hold at least one full buffer from one urb */
267 #define DIGI_IN_BUF_SIZE                64
268
269 /* retry timeout while sleeping */
270 #define DIGI_RETRY_TIMEOUT              (HZ/10)
271
272 /* timeout while waiting for tty output to drain in close */
273 /* this delay is used twice in close, so the total delay could */
274 /* be twice this value */
275 #define DIGI_CLOSE_TIMEOUT              (5*HZ)
276
277
278 /* AccelePort USB Defines */
279
280 /* ids */
281 #define DIGI_VENDOR_ID                  0x05c5
282 #define DIGI_2_ID                       0x0002  /* USB-2 */
283 #define DIGI_4_ID                       0x0004  /* USB-4 */
284
285 /* commands
286  * "INB": can be used on the in-band endpoint
287  * "OOB": can be used on the out-of-band endpoint
288  */
289 #define DIGI_CMD_SET_BAUD_RATE                  0       /* INB, OOB */
290 #define DIGI_CMD_SET_WORD_SIZE                  1       /* INB, OOB */
291 #define DIGI_CMD_SET_PARITY                     2       /* INB, OOB */
292 #define DIGI_CMD_SET_STOP_BITS                  3       /* INB, OOB */
293 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL         4       /* INB, OOB */
294 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL        5       /* INB, OOB */
295 #define DIGI_CMD_SET_DTR_SIGNAL                 6       /* INB, OOB */
296 #define DIGI_CMD_SET_RTS_SIGNAL                 7       /* INB, OOB */
297 #define DIGI_CMD_READ_INPUT_SIGNALS             8       /*      OOB */
298 #define DIGI_CMD_IFLUSH_FIFO                    9       /*      OOB */
299 #define DIGI_CMD_RECEIVE_ENABLE                 10      /* INB, OOB */
300 #define DIGI_CMD_BREAK_CONTROL                  11      /* INB, OOB */
301 #define DIGI_CMD_LOCAL_LOOPBACK                 12      /* INB, OOB */
302 #define DIGI_CMD_TRANSMIT_IDLE                  13      /* INB, OOB */
303 #define DIGI_CMD_READ_UART_REGISTER             14      /*      OOB */
304 #define DIGI_CMD_WRITE_UART_REGISTER            15      /* INB, OOB */
305 #define DIGI_CMD_AND_UART_REGISTER              16      /* INB, OOB */
306 #define DIGI_CMD_OR_UART_REGISTER               17      /* INB, OOB */
307 #define DIGI_CMD_SEND_DATA                      18      /* INB      */
308 #define DIGI_CMD_RECEIVE_DATA                   19      /* INB      */
309 #define DIGI_CMD_RECEIVE_DISABLE                20      /* INB      */
310 #define DIGI_CMD_GET_PORT_TYPE                  21      /*      OOB */
311
312 /* baud rates */
313 #define DIGI_BAUD_50                            0
314 #define DIGI_BAUD_75                            1
315 #define DIGI_BAUD_110                           2
316 #define DIGI_BAUD_150                           3
317 #define DIGI_BAUD_200                           4
318 #define DIGI_BAUD_300                           5
319 #define DIGI_BAUD_600                           6
320 #define DIGI_BAUD_1200                          7
321 #define DIGI_BAUD_1800                          8
322 #define DIGI_BAUD_2400                          9
323 #define DIGI_BAUD_4800                          10
324 #define DIGI_BAUD_7200                          11
325 #define DIGI_BAUD_9600                          12
326 #define DIGI_BAUD_14400                         13
327 #define DIGI_BAUD_19200                         14
328 #define DIGI_BAUD_28800                         15
329 #define DIGI_BAUD_38400                         16
330 #define DIGI_BAUD_57600                         17
331 #define DIGI_BAUD_76800                         18
332 #define DIGI_BAUD_115200                        19
333 #define DIGI_BAUD_153600                        20
334 #define DIGI_BAUD_230400                        21
335 #define DIGI_BAUD_460800                        22
336
337 /* arguments */
338 #define DIGI_WORD_SIZE_5                        0
339 #define DIGI_WORD_SIZE_6                        1
340 #define DIGI_WORD_SIZE_7                        2
341 #define DIGI_WORD_SIZE_8                        3
342
343 #define DIGI_PARITY_NONE                        0
344 #define DIGI_PARITY_ODD                         1
345 #define DIGI_PARITY_EVEN                        2
346 #define DIGI_PARITY_MARK                        3
347 #define DIGI_PARITY_SPACE                       4
348
349 #define DIGI_STOP_BITS_1                        0
350 #define DIGI_STOP_BITS_2                        1
351
352 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF        1
353 #define DIGI_INPUT_FLOW_CONTROL_RTS             2
354 #define DIGI_INPUT_FLOW_CONTROL_DTR             4
355
356 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF       1
357 #define DIGI_OUTPUT_FLOW_CONTROL_CTS            2
358 #define DIGI_OUTPUT_FLOW_CONTROL_DSR            4
359
360 #define DIGI_DTR_INACTIVE                       0
361 #define DIGI_DTR_ACTIVE                         1
362 #define DIGI_DTR_INPUT_FLOW_CONTROL             2
363
364 #define DIGI_RTS_INACTIVE                       0
365 #define DIGI_RTS_ACTIVE                         1
366 #define DIGI_RTS_INPUT_FLOW_CONTROL             2
367 #define DIGI_RTS_TOGGLE                         3
368
369 #define DIGI_FLUSH_TX                           1
370 #define DIGI_FLUSH_RX                           2
371 #define DIGI_RESUME_TX                          4 /* clears xoff condition */
372
373 #define DIGI_TRANSMIT_NOT_IDLE                  0
374 #define DIGI_TRANSMIT_IDLE                      1
375
376 #define DIGI_DISABLE                            0
377 #define DIGI_ENABLE                             1
378
379 #define DIGI_DEASSERT                           0
380 #define DIGI_ASSERT                             1
381
382 /* in band status codes */
383 #define DIGI_OVERRUN_ERROR                      4
384 #define DIGI_PARITY_ERROR                       8
385 #define DIGI_FRAMING_ERROR                      16
386 #define DIGI_BREAK_ERROR                        32
387
388 /* out of band status */
389 #define DIGI_NO_ERROR                           0
390 #define DIGI_BAD_FIRST_PARAMETER                1
391 #define DIGI_BAD_SECOND_PARAMETER               2
392 #define DIGI_INVALID_LINE                       3
393 #define DIGI_INVALID_OPCODE                     4
394
395 /* input signals */
396 #define DIGI_READ_INPUT_SIGNALS_SLOT            1
397 #define DIGI_READ_INPUT_SIGNALS_ERR             2
398 #define DIGI_READ_INPUT_SIGNALS_BUSY            4
399 #define DIGI_READ_INPUT_SIGNALS_PE              8
400 #define DIGI_READ_INPUT_SIGNALS_CTS             16
401 #define DIGI_READ_INPUT_SIGNALS_DSR             32
402 #define DIGI_READ_INPUT_SIGNALS_RI              64
403 #define DIGI_READ_INPUT_SIGNALS_DCD             128
404
405
406 /* Structures */
407
408 struct digi_serial {
409         spinlock_t ds_serial_lock;
410         struct usb_serial_port *ds_oob_port;    /* out-of-band port */
411         int ds_oob_port_num;                    /* index of out-of-band port */
412         int ds_device_started;
413 };
414
415 struct digi_port {
416         spinlock_t dp_port_lock;
417         int dp_port_num;
418         int dp_out_buf_len;
419         unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
420         int dp_in_buf_len;
421         unsigned char dp_in_buf[DIGI_IN_BUF_SIZE];
422         unsigned char dp_in_flag_buf[DIGI_IN_BUF_SIZE];
423         int dp_write_urb_in_use;
424         unsigned int dp_modem_signals;
425         wait_queue_head_t dp_modem_change_wait;
426         int dp_transmit_idle;
427         wait_queue_head_t dp_transmit_idle_wait;
428         int dp_throttled;
429         int dp_throttle_restart;
430         wait_queue_head_t dp_flush_wait;
431         int dp_in_close;                        /* close in progress */
432         wait_queue_head_t dp_close_wait;        /* wait queue for close */
433         struct work_struct dp_wakeup_work;
434 };
435
436
437 /* Local Function Declarations */
438
439 static void digi_wakeup_write( struct usb_serial_port *port );
440 static void digi_wakeup_write_lock(void *);
441 static int digi_write_oob_command( struct usb_serial_port *port,
442         unsigned char *buf, int count, int interruptible );
443 static int digi_write_inb_command( struct usb_serial_port *port,
444         unsigned char *buf, int count, unsigned long timeout );
445 static int digi_set_modem_signals( struct usb_serial_port *port,
446         unsigned int modem_signals, int interruptible );
447 static int digi_transmit_idle( struct usb_serial_port *port,
448         unsigned long timeout );
449 static void digi_rx_throttle (struct usb_serial_port *port);
450 static void digi_rx_unthrottle (struct usb_serial_port *port);
451 static void digi_set_termios( struct usb_serial_port *port, 
452         struct termios *old_termios );
453 static void digi_break_ctl( struct usb_serial_port *port, int break_state );
454 static int digi_ioctl( struct usb_serial_port *port, struct file *file,
455         unsigned int cmd, unsigned long arg );
456 static int digi_tiocmget( struct usb_serial_port *port, struct file *file );
457 static int digi_tiocmset( struct usb_serial_port *port, struct file *file,
458         unsigned int set, unsigned int clear );
459 static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count );
460 static void digi_write_bulk_callback( struct urb *urb, struct pt_regs *regs );
461 static int digi_write_room( struct usb_serial_port *port );
462 static int digi_chars_in_buffer( struct usb_serial_port *port );
463 static int digi_open( struct usb_serial_port *port, struct file *filp );
464 static void digi_close( struct usb_serial_port *port, struct file *filp );
465 static int digi_startup_device( struct usb_serial *serial );
466 static int digi_startup( struct usb_serial *serial );
467 static void digi_shutdown( struct usb_serial *serial );
468 static void digi_read_bulk_callback( struct urb *urb, struct pt_regs *regs );
469 static int digi_read_inb_callback( struct urb *urb );
470 static int digi_read_oob_callback( struct urb *urb );
471
472
473 /* Statics */
474
475 static int debug;
476
477 static struct usb_device_id id_table_combined [] = {
478         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
479         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
480         { }                                             /* Terminating entry */
481 };
482
483 static struct usb_device_id id_table_2 [] = {
484         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
485         { }                                             /* Terminating entry */
486 };
487
488 static struct usb_device_id id_table_4 [] = {
489         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
490         { }                                             /* Terminating entry */
491 };
492
493 MODULE_DEVICE_TABLE (usb, id_table_combined);
494
495 static struct usb_driver digi_driver = {
496         .owner =        THIS_MODULE,
497         .name =         "digi_acceleport",
498         .probe =        usb_serial_probe,
499         .disconnect =   usb_serial_disconnect,
500         .id_table =     id_table_combined,
501         .no_dynamic_id =        1,
502 };
503
504
505 /* device info needed for the Digi serial converter */
506
507 static struct usb_serial_driver digi_acceleport_2_device = {
508         .driver = {
509                 .owner =                THIS_MODULE,
510                 .name =                 "digi_2",
511         },
512         .description =                  "Digi 2 port USB adapter",
513         .id_table =                     id_table_2,
514         .num_interrupt_in =             0,
515         .num_bulk_in =                  4,
516         .num_bulk_out =                 4,
517         .num_ports =                    3,
518         .open =                         digi_open,
519         .close =                        digi_close,
520         .write =                        digi_write,
521         .write_room =                   digi_write_room,
522         .write_bulk_callback =          digi_write_bulk_callback,
523         .read_bulk_callback =           digi_read_bulk_callback,
524         .chars_in_buffer =              digi_chars_in_buffer,
525         .throttle =                     digi_rx_throttle,
526         .unthrottle =                   digi_rx_unthrottle,
527         .ioctl =                        digi_ioctl,
528         .set_termios =                  digi_set_termios,
529         .break_ctl =                    digi_break_ctl,
530         .tiocmget =                     digi_tiocmget,
531         .tiocmset =                     digi_tiocmset,
532         .attach =                       digi_startup,
533         .shutdown =                     digi_shutdown,
534 };
535
536 static struct usb_serial_driver digi_acceleport_4_device = {
537         .driver = {
538                 .owner =                THIS_MODULE,
539                 .name =                 "digi_4",
540         },
541         .description =                  "Digi 4 port USB adapter",
542         .id_table =                     id_table_4,
543         .num_interrupt_in =             0,
544         .num_bulk_in =                  5,
545         .num_bulk_out =                 5,
546         .num_ports =                    4,
547         .open =                         digi_open,
548         .close =                        digi_close,
549         .write =                        digi_write,
550         .write_room =                   digi_write_room,
551         .write_bulk_callback =          digi_write_bulk_callback,
552         .read_bulk_callback =           digi_read_bulk_callback,
553         .chars_in_buffer =              digi_chars_in_buffer,
554         .throttle =                     digi_rx_throttle,
555         .unthrottle =                   digi_rx_unthrottle,
556         .ioctl =                        digi_ioctl,
557         .set_termios =                  digi_set_termios,
558         .break_ctl =                    digi_break_ctl,
559         .tiocmget =                     digi_tiocmget,
560         .tiocmset =                     digi_tiocmset,
561         .attach =                       digi_startup,
562         .shutdown =                     digi_shutdown,
563 };
564
565
566 /* Functions */
567
568 /*
569 *  Cond Wait Interruptible Timeout Irqrestore
570 *
571 *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
572 *  so that wake ups are not lost if they occur between the unlock
573 *  and the sleep.  In other words, spin_unlock_irqrestore and
574 *  interruptible_sleep_on_timeout are "atomic" with respect to
575 *  wake ups.  This is used to implement condition variables.
576 *
577 *  interruptible_sleep_on_timeout is deprecated and has been replaced
578 *  with the equivalent code.
579 */
580
581 static inline long cond_wait_interruptible_timeout_irqrestore(
582         wait_queue_head_t *q, long timeout,
583         spinlock_t *lock, unsigned long flags )
584 {
585         DEFINE_WAIT(wait);
586
587         prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
588         spin_unlock_irqrestore(lock, flags);
589         timeout = schedule_timeout(timeout);
590         finish_wait(q, &wait);
591
592         return timeout;
593 }
594
595
596 /*
597 *  Digi Wakeup Write
598 *
599 *  Wake up port, line discipline, and tty processes sleeping
600 *  on writes.
601 */
602
603 static void digi_wakeup_write_lock(void *arg)
604 {
605         struct usb_serial_port *port = arg;
606         unsigned long flags;
607         struct digi_port *priv = usb_get_serial_port_data(port);
608
609
610         spin_lock_irqsave( &priv->dp_port_lock, flags );
611         digi_wakeup_write( port );
612         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
613 }
614
615 static void digi_wakeup_write( struct usb_serial_port *port )
616 {
617
618         struct tty_struct *tty = port->tty;
619
620
621         /* wake up port processes */
622         wake_up_interruptible( &port->write_wait );
623
624         /* wake up line discipline */
625         tty_wakeup(tty);
626 }
627
628
629 /*
630 *  Digi Write OOB Command
631 *
632 *  Write commands on the out of band port.  Commands are 4
633 *  bytes each, multiple commands can be sent at once, and
634 *  no command will be split across USB packets.  Returns 0
635 *  if successful, -EINTR if interrupted while sleeping and
636 *  the interruptible flag is true, or a negative error
637 *  returned by usb_submit_urb.
638 */
639
640 static int digi_write_oob_command( struct usb_serial_port *port,
641         unsigned char *buf, int count, int interruptible )
642 {
643
644         int ret = 0;
645         int len;
646         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
647         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
648         unsigned long flags = 0;
649
650
651 dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count );
652
653         spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
654
655         while( count > 0 ) {
656
657                 while( oob_port->write_urb->status == -EINPROGRESS
658                 || oob_priv->dp_write_urb_in_use ) {
659                         cond_wait_interruptible_timeout_irqrestore(
660                                 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
661                                 &oob_priv->dp_port_lock, flags );
662                         if( interruptible && signal_pending(current) ) {
663                                 return( -EINTR );
664                         }
665                         spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
666                 }
667
668                 /* len must be a multiple of 4, so commands are not split */
669                 len = min(count, oob_port->bulk_out_size );
670                 if( len > 4 )
671                         len &= ~3;
672
673                 memcpy( oob_port->write_urb->transfer_buffer, buf, len );
674                 oob_port->write_urb->transfer_buffer_length = len;
675                 oob_port->write_urb->dev = port->serial->dev;
676
677                 if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) {
678                         oob_priv->dp_write_urb_in_use = 1;
679                         count -= len;
680                         buf += len;
681                 }
682
683         }
684
685         spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );
686
687         if( ret ) {
688                 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__,
689                         ret );
690         }
691
692         return( ret );
693
694 }
695
696
697 /*
698 *  Digi Write In Band Command
699 *
700 *  Write commands on the given port.  Commands are 4
701 *  bytes each, multiple commands can be sent at once, and
702 *  no command will be split across USB packets.  If timeout
703 *  is non-zero, write in band command will return after
704 *  waiting unsuccessfully for the URB status to clear for
705 *  timeout ticks.  Returns 0 if successful, or a negative
706 *  error returned by digi_write.
707 */
708
709 static int digi_write_inb_command( struct usb_serial_port *port,
710         unsigned char *buf, int count, unsigned long timeout )
711 {
712
713         int ret = 0;
714         int len;
715         struct digi_port *priv = usb_get_serial_port_data(port);
716         unsigned char *data = port->write_urb->transfer_buffer;
717         unsigned long flags = 0;
718
719
720 dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv->dp_port_num,
721 count );
722
723         if( timeout )
724                 timeout += jiffies;
725         else
726                 timeout = ULONG_MAX;
727
728         spin_lock_irqsave( &priv->dp_port_lock, flags );
729
730         while( count > 0 && ret == 0 ) {
731
732                 while( (port->write_urb->status == -EINPROGRESS
733                 || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) {
734                         cond_wait_interruptible_timeout_irqrestore(
735                                 &port->write_wait, DIGI_RETRY_TIMEOUT,
736                                 &priv->dp_port_lock, flags );
737                         if( signal_pending(current) ) {
738                                 return( -EINTR );
739                         }
740                         spin_lock_irqsave( &priv->dp_port_lock, flags );
741                 }
742
743                 /* len must be a multiple of 4 and small enough to */
744                 /* guarantee the write will send buffered data first, */
745                 /* so commands are in order with data and not split */
746                 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len );
747                 if( len > 4 )
748                         len &= ~3;
749
750                 /* write any buffered data first */
751                 if( priv->dp_out_buf_len > 0 ) {
752                         data[0] = DIGI_CMD_SEND_DATA;
753                         data[1] = priv->dp_out_buf_len;
754                         memcpy( data+2, priv->dp_out_buf,
755                                 priv->dp_out_buf_len );
756                         memcpy( data+2+priv->dp_out_buf_len, buf, len );
757                         port->write_urb->transfer_buffer_length
758                                 = priv->dp_out_buf_len+2+len;
759                 } else {
760                         memcpy( data, buf, len );
761                         port->write_urb->transfer_buffer_length = len;
762                 }
763                 port->write_urb->dev = port->serial->dev;
764
765                 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
766                         priv->dp_write_urb_in_use = 1;
767                         priv->dp_out_buf_len = 0;
768                         count -= len;
769                         buf += len;
770                 }
771
772         }
773
774         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
775
776         if( ret ) {
777                 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
778                 ret, priv->dp_port_num );
779         }
780
781         return( ret );
782
783 }
784
785
786 /*
787 *  Digi Set Modem Signals
788 *
789 *  Sets or clears DTR and RTS on the port, according to the
790 *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
791 *  for the modem_signals argument.  Returns 0 if successful,
792 *  -EINTR if interrupted while sleeping, or a non-zero error
793 *  returned by usb_submit_urb.
794 */
795
796 static int digi_set_modem_signals( struct usb_serial_port *port,
797         unsigned int modem_signals, int interruptible )
798 {
799
800         int ret;
801         struct digi_port *port_priv = usb_get_serial_port_data(port);
802         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
803         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
804         unsigned char *data = oob_port->write_urb->transfer_buffer;
805         unsigned long flags = 0;
806
807
808 dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
809 port_priv->dp_port_num, modem_signals );
810
811         spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
812         spin_lock( &port_priv->dp_port_lock );
813
814         while( oob_port->write_urb->status == -EINPROGRESS
815         || oob_priv->dp_write_urb_in_use ) {
816                 spin_unlock( &port_priv->dp_port_lock );
817                 cond_wait_interruptible_timeout_irqrestore(
818                         &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
819                         &oob_priv->dp_port_lock, flags );
820                 if( interruptible && signal_pending(current) ) {
821                         return( -EINTR );
822                 }
823                 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
824                 spin_lock( &port_priv->dp_port_lock );
825         }
826
827         data[0] = DIGI_CMD_SET_DTR_SIGNAL;
828         data[1] = port_priv->dp_port_num;
829         data[2] = (modem_signals&TIOCM_DTR) ?
830                 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
831         data[3] = 0;
832
833         data[4] = DIGI_CMD_SET_RTS_SIGNAL;
834         data[5] = port_priv->dp_port_num;
835         data[6] = (modem_signals&TIOCM_RTS) ?
836                 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
837         data[7] = 0;
838
839         oob_port->write_urb->transfer_buffer_length = 8;
840         oob_port->write_urb->dev = port->serial->dev;
841
842         if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) {
843                 oob_priv->dp_write_urb_in_use = 1;
844                 port_priv->dp_modem_signals =
845                         (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
846                         | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
847         }
848
849         spin_unlock( &port_priv->dp_port_lock );
850         spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );
851
852         if( ret ) {
853                 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__,
854                 ret );
855         }
856
857         return( ret );
858
859 }
860
861
862 /*
863 *  Digi Transmit Idle
864 *
865 *  Digi transmit idle waits, up to timeout ticks, for the transmitter
866 *  to go idle.  It returns 0 if successful or a negative error.
867 *
868 *  There are race conditions here if more than one process is calling
869 *  digi_transmit_idle on the same port at the same time.  However, this
870 *  is only called from close, and only one process can be in close on a
871 *  port at a time, so its ok.
872 */
873
874 static int digi_transmit_idle( struct usb_serial_port *port,
875         unsigned long timeout )
876 {
877
878         int ret;
879         unsigned char buf[2];
880         struct digi_port *priv = usb_get_serial_port_data(port);
881         unsigned long flags = 0;
882
883
884         spin_lock_irqsave( &priv->dp_port_lock, flags );
885         priv->dp_transmit_idle = 0;
886         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
887
888         buf[0] = DIGI_CMD_TRANSMIT_IDLE;
889         buf[1] = 0;
890
891         timeout += jiffies;
892
893         if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 )
894                 return( ret );
895
896         spin_lock_irqsave( &priv->dp_port_lock, flags );
897
898         while( time_before(jiffies, timeout) && !priv->dp_transmit_idle ) {
899                 cond_wait_interruptible_timeout_irqrestore(
900                         &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
901                         &priv->dp_port_lock, flags );
902                 if( signal_pending(current) ) {
903                         return( -EINTR );
904                 }
905                 spin_lock_irqsave( &priv->dp_port_lock, flags );
906         }
907
908         priv->dp_transmit_idle = 0;
909         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
910
911         return( 0 );
912
913 }
914
915
916 static void digi_rx_throttle( struct usb_serial_port *port )
917 {
918
919         unsigned long flags;
920         struct digi_port *priv = usb_get_serial_port_data(port);
921
922
923 dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num );
924
925         /* stop receiving characters by not resubmitting the read urb */
926         spin_lock_irqsave( &priv->dp_port_lock, flags );
927         priv->dp_throttled = 1;
928         priv->dp_throttle_restart = 0;
929         priv->dp_in_buf_len = 0;
930         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
931
932 }
933
934
935 static void digi_rx_unthrottle( struct usb_serial_port *port )
936 {
937
938         int ret = 0;
939         int len;
940         unsigned long flags;
941         struct digi_port *priv = usb_get_serial_port_data(port);
942         struct tty_struct *tty = port->tty;
943
944
945 dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num );
946
947         spin_lock_irqsave( &priv->dp_port_lock, flags );
948
949         /* send any buffered chars from throttle time on to tty subsystem */
950         len = min(priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count );
951         if( len > 0 ) {
952                 memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len );
953                 memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len );
954                 tty->flip.char_buf_ptr += len;
955                 tty->flip.flag_buf_ptr += len;
956                 tty->flip.count += len;
957                 tty_flip_buffer_push( tty );
958         }
959
960         /* restart read chain */
961         if( priv->dp_throttle_restart ) {
962                 port->read_urb->dev = port->serial->dev;
963                 ret = usb_submit_urb( port->read_urb, GFP_ATOMIC );
964         }
965
966         /* turn throttle off */
967         priv->dp_throttled = 0;
968         priv->dp_in_buf_len = 0;
969         priv->dp_throttle_restart = 0;
970
971         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
972
973         if( ret ) {
974                 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
975                         ret, priv->dp_port_num );
976         }
977
978 }
979
980
981 static void digi_set_termios( struct usb_serial_port *port, 
982         struct termios *old_termios )
983 {
984
985         struct digi_port *priv = usb_get_serial_port_data(port);
986         unsigned int iflag = port->tty->termios->c_iflag;
987         unsigned int cflag = port->tty->termios->c_cflag;
988         unsigned int old_iflag = old_termios->c_iflag;
989         unsigned int old_cflag = old_termios->c_cflag;
990         unsigned char buf[32];
991         unsigned int modem_signals;
992         int arg,ret;
993         int i = 0;
994
995
996 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 );
997
998         /* set baud rate */
999         if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
1000
1001                 arg = -1;
1002
1003                 /* reassert DTR and (maybe) RTS on transition from B0 */
1004                 if( (old_cflag&CBAUD) == B0 ) {
1005                         /* don't set RTS if using hardware flow control */
1006                         /* and throttling input */
1007                         modem_signals = TIOCM_DTR;
1008                         if( !(port->tty->termios->c_cflag & CRTSCTS) ||
1009                         !test_bit(TTY_THROTTLED, &port->tty->flags) ) {
1010                                 modem_signals |= TIOCM_RTS;
1011                         }
1012                         digi_set_modem_signals( port, modem_signals, 1 );
1013                 }
1014
1015                 switch( (cflag&CBAUD) ) {
1016                         /* drop DTR and RTS on transition to B0 */
1017                 case B0: digi_set_modem_signals( port, 0, 1 ); break;
1018                 case B50: arg = DIGI_BAUD_50; break;
1019                 case B75: arg = DIGI_BAUD_75; break;
1020                 case B110: arg = DIGI_BAUD_110; break;
1021                 case B150: arg = DIGI_BAUD_150; break;
1022                 case B200: arg = DIGI_BAUD_200; break;
1023                 case B300: arg = DIGI_BAUD_300; break;
1024                 case B600: arg = DIGI_BAUD_600; break;
1025                 case B1200: arg = DIGI_BAUD_1200; break;
1026                 case B1800: arg = DIGI_BAUD_1800; break;
1027                 case B2400: arg = DIGI_BAUD_2400; break;
1028                 case B4800: arg = DIGI_BAUD_4800; break;
1029                 case B9600: arg = DIGI_BAUD_9600; break;
1030                 case B19200: arg = DIGI_BAUD_19200; break;
1031                 case B38400: arg = DIGI_BAUD_38400; break;
1032                 case B57600: arg = DIGI_BAUD_57600; break;
1033                 case B115200: arg = DIGI_BAUD_115200; break;
1034                 case B230400: arg = DIGI_BAUD_230400; break;
1035                 case B460800: arg = DIGI_BAUD_460800; break;
1036                 default:
1037                         dbg( "digi_set_termios: can't handle baud rate 0x%x",
1038                                 (cflag&CBAUD) );
1039                         break;
1040                 }
1041
1042                 if( arg != -1 ) {
1043                         buf[i++] = DIGI_CMD_SET_BAUD_RATE;
1044                         buf[i++] = priv->dp_port_num;
1045                         buf[i++] = arg;
1046                         buf[i++] = 0;
1047                 }
1048
1049         }
1050
1051         /* set parity */
1052         if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
1053
1054                 if( (cflag&PARENB) ) {
1055                         if( (cflag&PARODD) )
1056                                 arg = DIGI_PARITY_ODD;
1057                         else
1058                                 arg = DIGI_PARITY_EVEN;
1059                 } else {
1060                         arg = DIGI_PARITY_NONE;
1061                 }
1062
1063                 buf[i++] = DIGI_CMD_SET_PARITY;
1064                 buf[i++] = priv->dp_port_num;
1065                 buf[i++] = arg;
1066                 buf[i++] = 0;
1067
1068         }
1069
1070         /* set word size */
1071         if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
1072
1073                 arg = -1;
1074
1075                 switch( (cflag&CSIZE) ) {
1076                 case CS5: arg = DIGI_WORD_SIZE_5; break;
1077                 case CS6: arg = DIGI_WORD_SIZE_6; break;
1078                 case CS7: arg = DIGI_WORD_SIZE_7; break;
1079                 case CS8: arg = DIGI_WORD_SIZE_8; break;
1080                 default:
1081                         dbg( "digi_set_termios: can't handle word size %d",
1082                                 (cflag&CSIZE) );
1083                         break;
1084                 }
1085
1086                 if( arg != -1 ) {
1087                         buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1088                         buf[i++] = priv->dp_port_num;
1089                         buf[i++] = arg;
1090                         buf[i++] = 0;
1091                 }
1092
1093         }
1094
1095         /* set stop bits */
1096         if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
1097
1098                 if( (cflag&CSTOPB) )
1099                         arg = DIGI_STOP_BITS_2;
1100                 else
1101                         arg = DIGI_STOP_BITS_1;
1102
1103                 buf[i++] = DIGI_CMD_SET_STOP_BITS;
1104                 buf[i++] = priv->dp_port_num;
1105                 buf[i++] = arg;
1106                 buf[i++] = 0;
1107
1108         }
1109
1110         /* set input flow control */
1111         if( (iflag&IXOFF) != (old_iflag&IXOFF)
1112         || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
1113
1114                 arg = 0;
1115
1116                 if( (iflag&IXOFF) )
1117                         arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1118                 else
1119                         arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1120
1121                 if( (cflag&CRTSCTS) ) {
1122
1123                         arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1124
1125                         /* On USB-4 it is necessary to assert RTS prior */
1126                         /* to selecting RTS input flow control.  */
1127                         buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1128                         buf[i++] = priv->dp_port_num;
1129                         buf[i++] = DIGI_RTS_ACTIVE;
1130                         buf[i++] = 0;
1131
1132                 } else {
1133                         arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1134                 }
1135
1136                 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1137                 buf[i++] = priv->dp_port_num;
1138                 buf[i++] = arg;
1139                 buf[i++] = 0;
1140
1141         }
1142
1143         /* set output flow control */
1144         if( (iflag&IXON) != (old_iflag&IXON)
1145         || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
1146
1147                 arg = 0;
1148
1149                 if( (iflag&IXON) )
1150                         arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1151                 else
1152                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1153
1154                 if( (cflag&CRTSCTS) ) {
1155                         arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1156                 } else {
1157                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1158                         port->tty->hw_stopped = 0;
1159                 }
1160
1161                 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1162                 buf[i++] = priv->dp_port_num;
1163                 buf[i++] = arg;
1164                 buf[i++] = 0;
1165
1166         }
1167
1168         /* set receive enable/disable */
1169         if( (cflag&CREAD) != (old_cflag&CREAD) ) {
1170
1171                 if( (cflag&CREAD) )
1172                         arg = DIGI_ENABLE;
1173                 else
1174                         arg = DIGI_DISABLE;
1175
1176                 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1177                 buf[i++] = priv->dp_port_num;
1178                 buf[i++] = arg;
1179                 buf[i++] = 0;
1180
1181         }
1182
1183         if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 )
1184                 dbg( "digi_set_termios: write oob failed, ret=%d", ret );
1185
1186 }
1187
1188
1189 static void digi_break_ctl( struct usb_serial_port *port, int break_state )
1190 {
1191
1192         unsigned char buf[4];
1193
1194
1195         buf[0] = DIGI_CMD_BREAK_CONTROL;
1196         buf[1] = 2;                             /* length */
1197         buf[2] = break_state ? 1 : 0;
1198         buf[3] = 0;                             /* pad */
1199
1200         digi_write_inb_command( port, buf, 4, 0 );
1201
1202 }
1203
1204
1205 static int digi_tiocmget( struct usb_serial_port *port, struct file *file )
1206 {
1207         struct digi_port *priv = usb_get_serial_port_data(port);
1208         unsigned int val;
1209         unsigned long flags;
1210
1211         dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num);
1212
1213         spin_lock_irqsave( &priv->dp_port_lock, flags );
1214         val = priv->dp_modem_signals;
1215         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1216         return val;
1217 }
1218
1219
1220 static int digi_tiocmset( struct usb_serial_port *port, struct file *file,
1221         unsigned int set, unsigned int clear )
1222 {
1223         struct digi_port *priv = usb_get_serial_port_data(port);
1224         unsigned int val;
1225         unsigned long flags;
1226
1227         dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num);
1228
1229         spin_lock_irqsave( &priv->dp_port_lock, flags );
1230         val = (priv->dp_modem_signals & ~clear) | set;
1231         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1232         return digi_set_modem_signals( port, val, 1 );
1233 }
1234
1235
1236 static int digi_ioctl( struct usb_serial_port *port, struct file *file,
1237         unsigned int cmd, unsigned long arg )
1238 {
1239
1240         struct digi_port *priv = usb_get_serial_port_data(port);
1241
1242 dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd );
1243
1244         switch (cmd) {
1245
1246         case TIOCMIWAIT:
1247                 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
1248                 /* TODO */
1249                 return( 0 );
1250
1251         case TIOCGICOUNT:
1252                 /* return count of modemline transitions */
1253                 /* TODO */
1254                 return 0;
1255
1256         }
1257
1258         return( -ENOIOCTLCMD );
1259
1260 }
1261
1262
1263 static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count )
1264 {
1265
1266         int ret,data_len,new_len;
1267         struct digi_port *priv = usb_get_serial_port_data(port);
1268         unsigned char *data = port->write_urb->transfer_buffer;
1269         unsigned long flags = 0;
1270
1271
1272 dbg( "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
1273 priv->dp_port_num, count, in_interrupt() );
1274
1275         /* copy user data (which can sleep) before getting spin lock */
1276         count = min( count, port->bulk_out_size-2 );
1277         count = min( 64, count);
1278
1279         /* be sure only one write proceeds at a time */
1280         /* there are races on the port private buffer */
1281         /* and races to check write_urb->status */
1282         spin_lock_irqsave( &priv->dp_port_lock, flags );
1283
1284         /* wait for urb status clear to submit another urb */
1285         if( port->write_urb->status == -EINPROGRESS
1286         || priv->dp_write_urb_in_use ) {
1287
1288                 /* buffer data if count is 1 (probably put_char) if possible */
1289                 if( count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE ) {
1290                         priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
1291                         new_len = 1;
1292                 } else {
1293                         new_len = 0;
1294                 }
1295
1296                 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1297
1298                 return( new_len );
1299
1300         }
1301
1302         /* allow space for any buffered data and for new data, up to */
1303         /* transfer buffer size - 2 (for command and length bytes) */
1304         new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
1305         data_len = new_len + priv->dp_out_buf_len;
1306
1307         if( data_len == 0 ) {
1308                 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1309                 return( 0 );
1310         }
1311
1312         port->write_urb->transfer_buffer_length = data_len+2;
1313         port->write_urb->dev = port->serial->dev;
1314
1315         *data++ = DIGI_CMD_SEND_DATA;
1316         *data++ = data_len;
1317
1318         /* copy in buffered data first */
1319         memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len );
1320         data += priv->dp_out_buf_len;
1321
1322         /* copy in new data */
1323         memcpy( data, buf, new_len );
1324
1325         if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
1326                 priv->dp_write_urb_in_use = 1;
1327                 ret = new_len;
1328                 priv->dp_out_buf_len = 0;
1329         }
1330
1331         /* return length of new data written, or error */
1332         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1333         if( ret < 0 ) {
1334                 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1335                         ret, priv->dp_port_num );
1336         }
1337
1338 dbg( "digi_write: returning %d", ret );
1339         return( ret );
1340
1341
1342
1343
1344 static void digi_write_bulk_callback( struct urb *urb, struct pt_regs *regs )
1345 {
1346
1347         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1348         struct usb_serial *serial;
1349         struct digi_port *priv;
1350         struct digi_serial *serial_priv;
1351         int ret = 0;
1352
1353
1354 dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status );
1355
1356         /* port and serial sanity check */
1357         if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) {
1358                 err("%s: port or port->private is NULL, status=%d", __FUNCTION__,
1359                         urb->status );
1360                 return;
1361         }
1362         serial = port->serial;
1363         if( serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL ) {
1364                 err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__, urb->status );
1365                 return;
1366         }
1367
1368         /* handle oob callback */
1369         if( priv->dp_port_num == serial_priv->ds_oob_port_num ) {
1370                 dbg( "digi_write_bulk_callback: oob callback" );
1371                 spin_lock( &priv->dp_port_lock );
1372                 priv->dp_write_urb_in_use = 0;
1373                 wake_up_interruptible( &port->write_wait );
1374                 spin_unlock( &priv->dp_port_lock );
1375                 return;
1376         }
1377
1378         /* try to send any buffered data on this port, if it is open */
1379         spin_lock( &priv->dp_port_lock );
1380         priv->dp_write_urb_in_use = 0;
1381         if( port->open_count && port->write_urb->status != -EINPROGRESS
1382         && priv->dp_out_buf_len > 0 ) {
1383
1384                 *((unsigned char *)(port->write_urb->transfer_buffer))
1385                         = (unsigned char)DIGI_CMD_SEND_DATA;
1386                 *((unsigned char *)(port->write_urb->transfer_buffer)+1)
1387                         = (unsigned char)priv->dp_out_buf_len;
1388
1389                 port->write_urb->transfer_buffer_length
1390                         = priv->dp_out_buf_len+2;
1391                 port->write_urb->dev = serial->dev;
1392
1393                 memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf,
1394                         priv->dp_out_buf_len );
1395
1396                 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
1397                         priv->dp_write_urb_in_use = 1;
1398                         priv->dp_out_buf_len = 0;
1399                 }
1400
1401         }
1402
1403         /* wake up processes sleeping on writes immediately */
1404         digi_wakeup_write( port );
1405
1406         /* also queue up a wakeup at scheduler time, in case we */
1407         /* lost the race in write_chan(). */
1408         schedule_work(&priv->dp_wakeup_work);
1409
1410         spin_unlock( &priv->dp_port_lock );
1411
1412         if( ret ) {
1413                 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1414                         ret, priv->dp_port_num );
1415         }
1416
1417 }
1418
1419
1420 static int digi_write_room( struct usb_serial_port *port )
1421 {
1422
1423         int room;
1424         struct digi_port *priv = usb_get_serial_port_data(port);
1425         unsigned long flags = 0;
1426
1427
1428         spin_lock_irqsave( &priv->dp_port_lock, flags );
1429
1430         if( port->write_urb->status == -EINPROGRESS
1431         || priv->dp_write_urb_in_use )
1432                 room = 0;
1433         else
1434                 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1435
1436         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1437
1438 dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room );
1439         return( room );
1440
1441 }
1442
1443
1444 static int digi_chars_in_buffer( struct usb_serial_port *port )
1445 {
1446
1447         struct digi_port *priv = usb_get_serial_port_data(port);
1448
1449
1450         if( port->write_urb->status == -EINPROGRESS
1451         || priv->dp_write_urb_in_use ) {
1452 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 );
1453                 /* return( port->bulk_out_size - 2 ); */
1454                 return( 256 );
1455         } else {
1456 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len );
1457                 return( priv->dp_out_buf_len );
1458         }
1459
1460 }
1461
1462
1463 static int digi_open( struct usb_serial_port *port, struct file *filp )
1464 {
1465
1466         int ret;
1467         unsigned char buf[32];
1468         struct digi_port *priv = usb_get_serial_port_data(port);
1469         struct termios not_termios;
1470         unsigned long flags = 0;
1471
1472
1473 dbg( "digi_open: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count );
1474
1475         /* be sure the device is started up */
1476         if( digi_startup_device( port->serial ) != 0 )
1477                 return( -ENXIO );
1478
1479         spin_lock_irqsave( &priv->dp_port_lock, flags );
1480
1481         /* don't wait on a close in progress for non-blocking opens */
1482         if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1483                 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1484                 return( -EAGAIN );
1485         }
1486
1487         /* wait for a close in progress to finish */
1488         while( priv->dp_in_close ) {
1489                 cond_wait_interruptible_timeout_irqrestore(
1490                         &priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
1491                         &priv->dp_port_lock, flags );
1492                 if( signal_pending(current) ) {
1493                         return( -EINTR );
1494                 }
1495                 spin_lock_irqsave( &priv->dp_port_lock, flags );
1496         }
1497
1498         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1499  
1500         /* read modem signals automatically whenever they change */
1501         buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1502         buf[1] = priv->dp_port_num;
1503         buf[2] = DIGI_ENABLE;
1504         buf[3] = 0;
1505
1506         /* flush fifos */
1507         buf[4] = DIGI_CMD_IFLUSH_FIFO;
1508         buf[5] = priv->dp_port_num;
1509         buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1510         buf[7] = 0;
1511
1512         if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 )
1513                 dbg( "digi_open: write oob failed, ret=%d", ret );
1514
1515         /* set termios settings */
1516         not_termios.c_cflag = ~port->tty->termios->c_cflag;
1517         not_termios.c_iflag = ~port->tty->termios->c_iflag;
1518         digi_set_termios( port, &not_termios );
1519
1520         /* set DTR and RTS */
1521         digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 );
1522
1523         return( 0 );
1524
1525 }
1526
1527
1528 static void digi_close( struct usb_serial_port *port, struct file *filp )
1529 {
1530         DEFINE_WAIT(wait);
1531         int ret;
1532         unsigned char buf[32];
1533         struct tty_struct *tty = port->tty;
1534         struct digi_port *priv = usb_get_serial_port_data(port);
1535         unsigned long flags = 0;
1536
1537
1538 dbg( "digi_close: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count );
1539
1540
1541         /* if disconnected, just clear flags */
1542         if (!usb_get_intfdata(port->serial->interface))
1543                 goto exit;
1544
1545         /* do cleanup only after final close on this port */
1546         spin_lock_irqsave( &priv->dp_port_lock, flags );
1547         priv->dp_in_close = 1;
1548         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1549
1550         /* tell line discipline to process only XON/XOFF */
1551         tty->closing = 1;
1552
1553         /* wait for output to drain */
1554         if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1555                 tty_wait_until_sent( tty, DIGI_CLOSE_TIMEOUT );
1556         }
1557
1558         /* flush driver and line discipline buffers */
1559         if( tty->driver->flush_buffer )
1560                 tty->driver->flush_buffer( tty );
1561         tty_ldisc_flush(tty);
1562
1563         if (port->serial->dev) {
1564                 /* wait for transmit idle */
1565                 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1566                         digi_transmit_idle( port, DIGI_CLOSE_TIMEOUT );
1567                 }
1568
1569                 /* drop DTR and RTS */
1570                 digi_set_modem_signals( port, 0, 0 );
1571
1572                 /* disable input flow control */
1573                 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1574                 buf[1] = priv->dp_port_num;
1575                 buf[2] = DIGI_DISABLE;
1576                 buf[3] = 0;
1577
1578                 /* disable output flow control */
1579                 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1580                 buf[5] = priv->dp_port_num;
1581                 buf[6] = DIGI_DISABLE;
1582                 buf[7] = 0;
1583
1584                 /* disable reading modem signals automatically */
1585                 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1586                 buf[9] = priv->dp_port_num;
1587                 buf[10] = DIGI_DISABLE;
1588                 buf[11] = 0;
1589
1590                 /* disable receive */
1591                 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1592                 buf[13] = priv->dp_port_num;
1593                 buf[14] = DIGI_DISABLE;
1594                 buf[15] = 0;
1595
1596                 /* flush fifos */
1597                 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1598                 buf[17] = priv->dp_port_num;
1599                 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1600                 buf[19] = 0;
1601
1602                 if( (ret=digi_write_oob_command( port, buf, 20, 0 )) != 0 )
1603                         dbg( "digi_close: write oob failed, ret=%d", ret );
1604
1605                 /* wait for final commands on oob port to complete */
1606                 prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_INTERRUPTIBLE);
1607                 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1608                 finish_wait(&priv->dp_flush_wait, &wait);
1609
1610                 /* shutdown any outstanding bulk writes */
1611                 usb_kill_urb(port->write_urb);
1612         }
1613
1614         tty->closing = 0;
1615
1616 exit:
1617         spin_lock_irqsave( &priv->dp_port_lock, flags );
1618         priv->dp_write_urb_in_use = 0;
1619         priv->dp_in_close = 0;
1620         wake_up_interruptible( &priv->dp_close_wait );
1621         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1622
1623 dbg( "digi_close: done" );
1624 }
1625
1626
1627 /*
1628 *  Digi Startup Device
1629 *
1630 *  Starts reads on all ports.  Must be called AFTER startup, with
1631 *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1632 */
1633
1634 static int digi_startup_device( struct usb_serial *serial )
1635 {
1636
1637         int i,ret = 0;
1638         struct digi_serial *serial_priv = usb_get_serial_data(serial);
1639         struct usb_serial_port *port;
1640
1641
1642         /* be sure this happens exactly once */
1643         spin_lock( &serial_priv->ds_serial_lock );
1644         if( serial_priv->ds_device_started ) {
1645                 spin_unlock( &serial_priv->ds_serial_lock );
1646                 return( 0 );
1647         }
1648         serial_priv->ds_device_started = 1;
1649         spin_unlock( &serial_priv->ds_serial_lock );
1650
1651         /* start reading from each bulk in endpoint for the device */
1652         /* set USB_DISABLE_SPD flag for write bulk urbs */
1653         for( i=0; i<serial->type->num_ports+1; i++ ) {
1654
1655                 port = serial->port[i];
1656
1657                 port->write_urb->dev = port->serial->dev;
1658
1659                 if( (ret=usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0 ) {
1660                         err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1661                         ret, i );
1662                         break;
1663                 }
1664
1665         }
1666
1667         return( ret );
1668
1669 }
1670
1671
1672 static int digi_startup( struct usb_serial *serial )
1673 {
1674
1675         int i;
1676         struct digi_port *priv;
1677         struct digi_serial *serial_priv;
1678
1679
1680 dbg( "digi_startup: TOP" );
1681
1682         /* allocate the private data structures for all ports */
1683         /* number of regular ports + 1 for the out-of-band port */
1684         for( i=0; i<serial->type->num_ports+1; i++ ) {
1685
1686                 /* allocate port private structure */
1687                 priv = (struct digi_port *)kmalloc( sizeof(struct digi_port),
1688                         GFP_KERNEL );
1689                 if( priv == (struct digi_port *)0 ) {
1690                         while( --i >= 0 )
1691                                 kfree( usb_get_serial_port_data(serial->port[i]) );
1692                         return( 1 );                    /* error */
1693                 }
1694
1695                 /* initialize port private structure */
1696                 spin_lock_init( &priv->dp_port_lock );
1697                 priv->dp_port_num = i;
1698                 priv->dp_out_buf_len = 0;
1699                 priv->dp_in_buf_len = 0;
1700                 priv->dp_write_urb_in_use = 0;
1701                 priv->dp_modem_signals = 0;
1702                 init_waitqueue_head( &priv->dp_modem_change_wait );
1703                 priv->dp_transmit_idle = 0;
1704                 init_waitqueue_head( &priv->dp_transmit_idle_wait );
1705                 priv->dp_throttled = 0;
1706                 priv->dp_throttle_restart = 0;
1707                 init_waitqueue_head( &priv->dp_flush_wait );
1708                 priv->dp_in_close = 0;
1709                 init_waitqueue_head( &priv->dp_close_wait );
1710                 INIT_WORK(&priv->dp_wakeup_work,
1711                                 digi_wakeup_write_lock, serial->port[i]);
1712
1713                 /* initialize write wait queue for this port */
1714                 init_waitqueue_head( &serial->port[i]->write_wait );
1715
1716                 usb_set_serial_port_data(serial->port[i], priv);
1717         }
1718
1719         /* allocate serial private structure */
1720         serial_priv = (struct digi_serial *)kmalloc( sizeof(struct digi_serial),
1721                 GFP_KERNEL );
1722         if( serial_priv == (struct digi_serial *)0 ) {
1723                 for( i=0; i<serial->type->num_ports+1; i++ )
1724                         kfree( usb_get_serial_port_data(serial->port[i]) );
1725                 return( 1 );                    /* error */
1726         }
1727
1728         /* initialize serial private structure */
1729         spin_lock_init( &serial_priv->ds_serial_lock );
1730         serial_priv->ds_oob_port_num = serial->type->num_ports;
1731         serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1732         serial_priv->ds_device_started = 0;
1733         usb_set_serial_data(serial, serial_priv);
1734
1735         return( 0 );
1736
1737 }
1738
1739
1740 static void digi_shutdown( struct usb_serial *serial )
1741 {
1742
1743         int i;
1744
1745
1746 dbg( "digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt() );
1747
1748         /* stop reads and writes on all ports */
1749         for( i=0; i<serial->type->num_ports+1; i++ ) {
1750                 usb_kill_urb(serial->port[i]->read_urb);
1751                 usb_kill_urb(serial->port[i]->write_urb);
1752         }
1753
1754         /* free the private data structures for all ports */
1755         /* number of regular ports + 1 for the out-of-band port */
1756         for( i=0; i<serial->type->num_ports+1; i++ )
1757                 kfree( usb_get_serial_port_data(serial->port[i]) );
1758         kfree( usb_get_serial_data(serial) );
1759 }
1760
1761
1762 static void digi_read_bulk_callback( struct urb *urb, struct pt_regs *regs )
1763 {
1764
1765         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1766         struct digi_port *priv;
1767         struct digi_serial *serial_priv;
1768         int ret;
1769
1770
1771 dbg( "digi_read_bulk_callback: TOP" );
1772
1773         /* port sanity check, do not resubmit if port is not valid */
1774         if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) {
1775                 err("%s: port or port->private is NULL, status=%d", __FUNCTION__,
1776                         urb->status );
1777                 return;
1778         }
1779         if( port->serial == NULL
1780         || (serial_priv=usb_get_serial_data(port->serial)) == NULL ) {
1781                 err("%s: serial is bad or serial->private is NULL, status=%d", __FUNCTION__, urb->status );
1782                 return;
1783         }
1784
1785         /* do not resubmit urb if it has any status error */
1786         if( urb->status ) {
1787                 err("%s: nonzero read bulk status: status=%d, port=%d", __FUNCTION__, urb->status, priv->dp_port_num );
1788                 return;
1789         }
1790
1791         /* handle oob or inb callback, do not resubmit if error */
1792         if( priv->dp_port_num == serial_priv->ds_oob_port_num ) {
1793                 if( digi_read_oob_callback( urb ) != 0 )
1794                         return;
1795         } else {
1796                 if( digi_read_inb_callback( urb ) != 0 )
1797                         return;
1798         }
1799
1800         /* continue read */
1801         urb->dev = port->serial->dev;
1802         if( (ret=usb_submit_urb(urb, GFP_ATOMIC)) != 0 ) {
1803                 err("%s: failed resubmitting urb, ret=%d, port=%d", __FUNCTION__,
1804                         ret, priv->dp_port_num );
1805         }
1806
1807 }
1808
1809
1810 /* 
1811 *  Digi Read INB Callback
1812 *
1813 *  Digi Read INB Callback handles reads on the in band ports, sending
1814 *  the data on to the tty subsystem.  When called we know port and
1815 *  port->private are not NULL and port->serial has been validated.
1816 *  It returns 0 if successful, 1 if successful but the port is
1817 *  throttled, and -1 if the sanity checks failed.
1818 */
1819
1820 static int digi_read_inb_callback( struct urb *urb )
1821 {
1822
1823         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1824         struct tty_struct *tty = port->tty;
1825         struct digi_port *priv = usb_get_serial_port_data(port);
1826         int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1827         int len = ((unsigned char *)urb->transfer_buffer)[1];
1828         int status = ((unsigned char *)urb->transfer_buffer)[2];
1829         unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
1830         int flag,throttled;
1831
1832         /* do not process callbacks on closed ports */
1833         /* but do continue the read chain */
1834         if( port->open_count == 0 )
1835                 return( 0 );
1836
1837         /* short/multiple packet check */
1838         if( urb->actual_length != len + 2 ) {
1839                 err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, port=%d, opcode=%d, len=%d, actual_length=%d, status=%d", __FUNCTION__, urb->status, priv->dp_port_num, opcode, len, urb->actual_length, status );
1840                 return( -1 );
1841         }
1842
1843         spin_lock( &priv->dp_port_lock );
1844
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;
1850
1851         /* receive data */
1852         if( opcode == DIGI_CMD_RECEIVE_DATA ) {
1853
1854                 /* get flag from status */
1855                 flag = 0;
1856
1857                 /* overrun is special, not associated with a char */
1858                 if( status & DIGI_OVERRUN_ERROR ) {
1859                         tty_insert_flip_char( tty, 0, TTY_OVERRUN );
1860                 }
1861
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;
1870                 }
1871
1872                 /* data length is len-1 (one byte of len is status) */
1873                 --len;
1874
1875                 if( throttled ) {
1876
1877                         len = min( len,
1878                                 DIGI_IN_BUF_SIZE - priv->dp_in_buf_len );
1879
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;
1886                         }
1887
1888                 } else {
1889
1890                         len = min( len, TTY_FLIPBUF_SIZE - tty->flip.count );
1891
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 );
1899                         }
1900
1901                 }
1902
1903         }
1904
1905         spin_unlock( &priv->dp_port_lock );
1906
1907         if( opcode == DIGI_CMD_RECEIVE_DISABLE ) {
1908                 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__ );
1909         } else if( opcode != DIGI_CMD_RECEIVE_DATA ) {
1910                 dbg("%s: unknown opcode: %d", __FUNCTION__, opcode );
1911         }
1912
1913         return( throttled ? 1 : 0 );
1914
1915 }
1916
1917
1918 /* 
1919 *  Digi Read OOB Callback
1920 *
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.
1925 */
1926
1927 static int digi_read_oob_callback( struct urb *urb )
1928 {
1929
1930         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1931         struct usb_serial *serial = port->serial;
1932         struct digi_port *priv = usb_get_serial_port_data(port);
1933         int opcode, line, status, val;
1934         int i;
1935
1936
1937 dbg( "digi_read_oob_callback: port=%d, len=%d", priv->dp_port_num,
1938 urb->actual_length );
1939
1940         /* handle each oob command */
1941         for( i=0; i<urb->actual_length-3; ) {
1942
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++];
1947
1948 dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1949 opcode, line, status, val );
1950
1951                 if( status != 0 || line >= serial->type->num_ports )
1952                         continue;
1953
1954                 port = serial->port[line];
1955
1956                 if ((priv=usb_get_serial_port_data(port)) == NULL )
1957                         return -1;
1958
1959                 if( opcode == DIGI_CMD_READ_INPUT_SIGNALS ) {
1960
1961                         spin_lock( &priv->dp_port_lock );
1962
1963                         /* convert from digi flags to termiox flags */
1964                         if( val & DIGI_READ_INPUT_SIGNALS_CTS ) {
1965                                 priv->dp_modem_signals |= TIOCM_CTS;
1966                                 /* port must be open to use tty struct */
1967                                 if( port->open_count
1968                                 && port->tty->termios->c_cflag & CRTSCTS ) {
1969                                         port->tty->hw_stopped = 0;
1970                                         digi_wakeup_write( port );
1971                                 }
1972                         } else {
1973                                 priv->dp_modem_signals &= ~TIOCM_CTS;
1974                                 /* port must be open to use tty struct */
1975                                 if( port->open_count
1976                                 && port->tty->termios->c_cflag & CRTSCTS ) {
1977                                         port->tty->hw_stopped = 1;
1978                                 }
1979                         }
1980                         if( val & DIGI_READ_INPUT_SIGNALS_DSR )
1981                                 priv->dp_modem_signals |= TIOCM_DSR;
1982                         else
1983                                 priv->dp_modem_signals &= ~TIOCM_DSR;
1984                         if( val & DIGI_READ_INPUT_SIGNALS_RI )
1985                                 priv->dp_modem_signals |= TIOCM_RI;
1986                         else
1987                                 priv->dp_modem_signals &= ~TIOCM_RI;
1988                         if( val & DIGI_READ_INPUT_SIGNALS_DCD )
1989                                 priv->dp_modem_signals |= TIOCM_CD;
1990                         else
1991                                 priv->dp_modem_signals &= ~TIOCM_CD;
1992
1993                         wake_up_interruptible( &priv->dp_modem_change_wait );
1994                         spin_unlock( &priv->dp_port_lock );
1995
1996                 } else if( opcode == DIGI_CMD_TRANSMIT_IDLE ) {
1997
1998                         spin_lock( &priv->dp_port_lock );
1999                         priv->dp_transmit_idle = 1;
2000                         wake_up_interruptible( &priv->dp_transmit_idle_wait );
2001                         spin_unlock( &priv->dp_port_lock );
2002
2003                 } else if( opcode == DIGI_CMD_IFLUSH_FIFO ) {
2004
2005                         wake_up_interruptible( &priv->dp_flush_wait );
2006
2007                 }
2008
2009         }
2010
2011         return( 0 );
2012
2013 }
2014
2015
2016 static int __init digi_init (void)
2017 {
2018         int retval;
2019         retval = usb_serial_register(&digi_acceleport_2_device);
2020         if (retval)
2021                 goto failed_acceleport_2_device;
2022         retval = usb_serial_register(&digi_acceleport_4_device);
2023         if (retval) 
2024                 goto failed_acceleport_4_device;
2025         retval = usb_register(&digi_driver);
2026         if (retval)
2027                 goto failed_usb_register;
2028         info(DRIVER_VERSION ":" DRIVER_DESC);
2029         return 0;
2030 failed_usb_register:
2031         usb_serial_deregister(&digi_acceleport_4_device);
2032 failed_acceleport_4_device:
2033         usb_serial_deregister(&digi_acceleport_2_device);
2034 failed_acceleport_2_device:
2035         return retval;
2036 }
2037
2038
2039 static void __exit digi_exit (void)
2040 {
2041         usb_deregister (&digi_driver);
2042         usb_serial_deregister (&digi_acceleport_2_device);
2043         usb_serial_deregister (&digi_acceleport_4_device);
2044 }
2045
2046
2047 module_init(digi_init);
2048 module_exit(digi_exit);
2049
2050
2051 MODULE_AUTHOR( DRIVER_AUTHOR );
2052 MODULE_DESCRIPTION( DRIVER_DESC );
2053 MODULE_LICENSE("GPL");
2054
2055 module_param(debug, bool, S_IRUGO | S_IWUSR);
2056 MODULE_PARM_DESC(debug, "Debug enabled or not");