Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/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 
 18 #include <linux/kernel.h>
 19 #include <linux/errno.h>
 20 #include <linux/slab.h>
 21 #include <linux/tty.h>
 22 #include <linux/tty_driver.h>
 23 #include <linux/tty_flip.h>
 24 #include <linux/module.h>
 25 #include <linux/spinlock.h>
 26 #include <linux/workqueue.h>
 27 #include <linux/uaccess.h>
 28 #include <linux/usb.h>
 29 #include <linux/wait.h>
 30 #include <linux/usb/serial.h>
 31 
 32 /* Defines */
 33 
 34 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
 35 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
 36 
 37 /* port output buffer length -- must be <= transfer buffer length - 2 */
 38 /* so we can be sure to send the full buffer in one urb */
 39 #define DIGI_OUT_BUF_SIZE               8
 40 
 41 /* port input buffer length -- must be >= transfer buffer length - 3 */
 42 /* so we can be sure to hold at least one full buffer from one urb */
 43 #define DIGI_IN_BUF_SIZE                64
 44 
 45 /* retry timeout while sleeping */
 46 #define DIGI_RETRY_TIMEOUT              (HZ/10)
 47 
 48 /* timeout while waiting for tty output to drain in close */
 49 /* this delay is used twice in close, so the total delay could */
 50 /* be twice this value */
 51 #define DIGI_CLOSE_TIMEOUT              (5*HZ)
 52 
 53 
 54 /* AccelePort USB Defines */
 55 
 56 /* ids */
 57 #define DIGI_VENDOR_ID                  0x05c5
 58 #define DIGI_2_ID                       0x0002  /* USB-2 */
 59 #define DIGI_4_ID                       0x0004  /* USB-4 */
 60 
 61 /* commands
 62  * "INB": can be used on the in-band endpoint
 63  * "OOB": can be used on the out-of-band endpoint
 64  */
 65 #define DIGI_CMD_SET_BAUD_RATE                  0       /* INB, OOB */
 66 #define DIGI_CMD_SET_WORD_SIZE                  1       /* INB, OOB */
 67 #define DIGI_CMD_SET_PARITY                     2       /* INB, OOB */
 68 #define DIGI_CMD_SET_STOP_BITS                  3       /* INB, OOB */
 69 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL         4       /* INB, OOB */
 70 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL        5       /* INB, OOB */
 71 #define DIGI_CMD_SET_DTR_SIGNAL                 6       /* INB, OOB */
 72 #define DIGI_CMD_SET_RTS_SIGNAL                 7       /* INB, OOB */
 73 #define DIGI_CMD_READ_INPUT_SIGNALS             8       /*      OOB */
 74 #define DIGI_CMD_IFLUSH_FIFO                    9       /*      OOB */
 75 #define DIGI_CMD_RECEIVE_ENABLE                 10      /* INB, OOB */
 76 #define DIGI_CMD_BREAK_CONTROL                  11      /* INB, OOB */
 77 #define DIGI_CMD_LOCAL_LOOPBACK                 12      /* INB, OOB */
 78 #define DIGI_CMD_TRANSMIT_IDLE                  13      /* INB, OOB */
 79 #define DIGI_CMD_READ_UART_REGISTER             14      /*      OOB */
 80 #define DIGI_CMD_WRITE_UART_REGISTER            15      /* INB, OOB */
 81 #define DIGI_CMD_AND_UART_REGISTER              16      /* INB, OOB */
 82 #define DIGI_CMD_OR_UART_REGISTER               17      /* INB, OOB */
 83 #define DIGI_CMD_SEND_DATA                      18      /* INB      */
 84 #define DIGI_CMD_RECEIVE_DATA                   19      /* INB      */
 85 #define DIGI_CMD_RECEIVE_DISABLE                20      /* INB      */
 86 #define DIGI_CMD_GET_PORT_TYPE                  21      /*      OOB */
 87 
 88 /* baud rates */
 89 #define DIGI_BAUD_50                            0
 90 #define DIGI_BAUD_75                            1
 91 #define DIGI_BAUD_110                           2
 92 #define DIGI_BAUD_150                           3
 93 #define DIGI_BAUD_200                           4
 94 #define DIGI_BAUD_300                           5
 95 #define DIGI_BAUD_600                           6
 96 #define DIGI_BAUD_1200                          7
 97 #define DIGI_BAUD_1800                          8
 98 #define DIGI_BAUD_2400                          9
 99 #define DIGI_BAUD_4800                          10
100 #define DIGI_BAUD_7200                          11
101 #define DIGI_BAUD_9600                          12
102 #define DIGI_BAUD_14400                         13
103 #define DIGI_BAUD_19200                         14
104 #define DIGI_BAUD_28800                         15
105 #define DIGI_BAUD_38400                         16
106 #define DIGI_BAUD_57600                         17
107 #define DIGI_BAUD_76800                         18
108 #define DIGI_BAUD_115200                        19
109 #define DIGI_BAUD_153600                        20
110 #define DIGI_BAUD_230400                        21
111 #define DIGI_BAUD_460800                        22
112 
113 /* arguments */
114 #define DIGI_WORD_SIZE_5                        0
115 #define DIGI_WORD_SIZE_6                        1
116 #define DIGI_WORD_SIZE_7                        2
117 #define DIGI_WORD_SIZE_8                        3
118 
119 #define DIGI_PARITY_NONE                        0
120 #define DIGI_PARITY_ODD                         1
121 #define DIGI_PARITY_EVEN                        2
122 #define DIGI_PARITY_MARK                        3
123 #define DIGI_PARITY_SPACE                       4
124 
125 #define DIGI_STOP_BITS_1                        0
126 #define DIGI_STOP_BITS_2                        1
127 
128 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF        1
129 #define DIGI_INPUT_FLOW_CONTROL_RTS             2
130 #define DIGI_INPUT_FLOW_CONTROL_DTR             4
131 
132 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF       1
133 #define DIGI_OUTPUT_FLOW_CONTROL_CTS            2
134 #define DIGI_OUTPUT_FLOW_CONTROL_DSR            4
135 
136 #define DIGI_DTR_INACTIVE                       0
137 #define DIGI_DTR_ACTIVE                         1
138 #define DIGI_DTR_INPUT_FLOW_CONTROL             2
139 
140 #define DIGI_RTS_INACTIVE                       0
141 #define DIGI_RTS_ACTIVE                         1
142 #define DIGI_RTS_INPUT_FLOW_CONTROL             2
143 #define DIGI_RTS_TOGGLE                         3
144 
145 #define DIGI_FLUSH_TX                           1
146 #define DIGI_FLUSH_RX                           2
147 #define DIGI_RESUME_TX                          4 /* clears xoff condition */
148 
149 #define DIGI_TRANSMIT_NOT_IDLE                  0
150 #define DIGI_TRANSMIT_IDLE                      1
151 
152 #define DIGI_DISABLE                            0
153 #define DIGI_ENABLE                             1
154 
155 #define DIGI_DEASSERT                           0
156 #define DIGI_ASSERT                             1
157 
158 /* in band status codes */
159 #define DIGI_OVERRUN_ERROR                      4
160 #define DIGI_PARITY_ERROR                       8
161 #define DIGI_FRAMING_ERROR                      16
162 #define DIGI_BREAK_ERROR                        32
163 
164 /* out of band status */
165 #define DIGI_NO_ERROR                           0
166 #define DIGI_BAD_FIRST_PARAMETER                1
167 #define DIGI_BAD_SECOND_PARAMETER               2
168 #define DIGI_INVALID_LINE                       3
169 #define DIGI_INVALID_OPCODE                     4
170 
171 /* input signals */
172 #define DIGI_READ_INPUT_SIGNALS_SLOT            1
173 #define DIGI_READ_INPUT_SIGNALS_ERR             2
174 #define DIGI_READ_INPUT_SIGNALS_BUSY            4
175 #define DIGI_READ_INPUT_SIGNALS_PE              8
176 #define DIGI_READ_INPUT_SIGNALS_CTS             16
177 #define DIGI_READ_INPUT_SIGNALS_DSR             32
178 #define DIGI_READ_INPUT_SIGNALS_RI              64
179 #define DIGI_READ_INPUT_SIGNALS_DCD             128
180 
181 
182 /* Structures */
183 
184 struct digi_serial {
185         spinlock_t ds_serial_lock;
186         struct usb_serial_port *ds_oob_port;    /* out-of-band port */
187         int ds_oob_port_num;                    /* index of out-of-band port */
188         int ds_device_started;
189 };
190 
191 struct digi_port {
192         spinlock_t dp_port_lock;
193         int dp_port_num;
194         int dp_out_buf_len;
195         unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
196         int dp_write_urb_in_use;
197         unsigned int dp_modem_signals;
198         int dp_transmit_idle;
199         wait_queue_head_t dp_transmit_idle_wait;
200         int dp_throttled;
201         int dp_throttle_restart;
202         wait_queue_head_t dp_flush_wait;
203         wait_queue_head_t dp_close_wait;        /* wait queue for close */
204         struct work_struct dp_wakeup_work;
205         struct usb_serial_port *dp_port;
206 };
207 
208 
209 /* Local Function Declarations */
210 
211 static void digi_wakeup_write_lock(struct work_struct *work);
212 static int digi_write_oob_command(struct usb_serial_port *port,
213         unsigned char *buf, int count, int interruptible);
214 static int digi_write_inb_command(struct usb_serial_port *port,
215         unsigned char *buf, int count, unsigned long timeout);
216 static int digi_set_modem_signals(struct usb_serial_port *port,
217         unsigned int modem_signals, int interruptible);
218 static int digi_transmit_idle(struct usb_serial_port *port,
219         unsigned long timeout);
220 static void digi_rx_throttle(struct tty_struct *tty);
221 static void digi_rx_unthrottle(struct tty_struct *tty);
222 static void digi_set_termios(struct tty_struct *tty,
223                 struct usb_serial_port *port, struct ktermios *old_termios);
224 static void digi_break_ctl(struct tty_struct *tty, int break_state);
225 static int digi_tiocmget(struct tty_struct *tty);
226 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
227                 unsigned int clear);
228 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
229                 const unsigned char *buf, int count);
230 static void digi_write_bulk_callback(struct urb *urb);
231 static int digi_write_room(struct tty_struct *tty);
232 static int digi_chars_in_buffer(struct tty_struct *tty);
233 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
234 static void digi_close(struct usb_serial_port *port);
235 static void digi_dtr_rts(struct usb_serial_port *port, int on);
236 static int digi_startup_device(struct usb_serial *serial);
237 static int digi_startup(struct usb_serial *serial);
238 static void digi_disconnect(struct usb_serial *serial);
239 static void digi_release(struct usb_serial *serial);
240 static int digi_port_probe(struct usb_serial_port *port);
241 static int digi_port_remove(struct usb_serial_port *port);
242 static void digi_read_bulk_callback(struct urb *urb);
243 static int digi_read_inb_callback(struct urb *urb);
244 static int digi_read_oob_callback(struct urb *urb);
245 
246 
247 static const struct usb_device_id id_table_combined[] = {
248         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
249         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
250         { }                                             /* Terminating entry */
251 };
252 
253 static const struct usb_device_id id_table_2[] = {
254         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
255         { }                                             /* Terminating entry */
256 };
257 
258 static const struct usb_device_id id_table_4[] = {
259         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
260         { }                                             /* Terminating entry */
261 };
262 
263 MODULE_DEVICE_TABLE(usb, id_table_combined);
264 
265 /* device info needed for the Digi serial converter */
266 
267 static struct usb_serial_driver digi_acceleport_2_device = {
268         .driver = {
269                 .owner =                THIS_MODULE,
270                 .name =                 "digi_2",
271         },
272         .description =                  "Digi 2 port USB adapter",
273         .id_table =                     id_table_2,
274         .num_ports =                    3,
275         .open =                         digi_open,
276         .close =                        digi_close,
277         .dtr_rts =                      digi_dtr_rts,
278         .write =                        digi_write,
279         .write_room =                   digi_write_room,
280         .write_bulk_callback =          digi_write_bulk_callback,
281         .read_bulk_callback =           digi_read_bulk_callback,
282         .chars_in_buffer =              digi_chars_in_buffer,
283         .throttle =                     digi_rx_throttle,
284         .unthrottle =                   digi_rx_unthrottle,
285         .set_termios =                  digi_set_termios,
286         .break_ctl =                    digi_break_ctl,
287         .tiocmget =                     digi_tiocmget,
288         .tiocmset =                     digi_tiocmset,
289         .attach =                       digi_startup,
290         .disconnect =                   digi_disconnect,
291         .release =                      digi_release,
292         .port_probe =                   digi_port_probe,
293         .port_remove =                  digi_port_remove,
294 };
295 
296 static struct usb_serial_driver digi_acceleport_4_device = {
297         .driver = {
298                 .owner =                THIS_MODULE,
299                 .name =                 "digi_4",
300         },
301         .description =                  "Digi 4 port USB adapter",
302         .id_table =                     id_table_4,
303         .num_ports =                    4,
304         .open =                         digi_open,
305         .close =                        digi_close,
306         .write =                        digi_write,
307         .write_room =                   digi_write_room,
308         .write_bulk_callback =          digi_write_bulk_callback,
309         .read_bulk_callback =           digi_read_bulk_callback,
310         .chars_in_buffer =              digi_chars_in_buffer,
311         .throttle =                     digi_rx_throttle,
312         .unthrottle =                   digi_rx_unthrottle,
313         .set_termios =                  digi_set_termios,
314         .break_ctl =                    digi_break_ctl,
315         .tiocmget =                     digi_tiocmget,
316         .tiocmset =                     digi_tiocmset,
317         .attach =                       digi_startup,
318         .disconnect =                   digi_disconnect,
319         .release =                      digi_release,
320         .port_probe =                   digi_port_probe,
321         .port_remove =                  digi_port_remove,
322 };
323 
324 static struct usb_serial_driver * const serial_drivers[] = {
325         &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
326 };
327 
328 /* Functions */
329 
330 /*
331  *  Cond Wait Interruptible Timeout Irqrestore
332  *
333  *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
334  *  so that wake ups are not lost if they occur between the unlock
335  *  and the sleep.  In other words, spin_unlock_irqrestore and
336  *  interruptible_sleep_on_timeout are "atomic" with respect to
337  *  wake ups.  This is used to implement condition variables.
338  *
339  *  interruptible_sleep_on_timeout is deprecated and has been replaced
340  *  with the equivalent code.
341  */
342 
343 static long cond_wait_interruptible_timeout_irqrestore(
344         wait_queue_head_t *q, long timeout,
345         spinlock_t *lock, unsigned long flags)
346 __releases(lock)
347 {
348         DEFINE_WAIT(wait);
349 
350         prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
351         spin_unlock_irqrestore(lock, flags);
352         timeout = schedule_timeout(timeout);
353         finish_wait(q, &wait);
354 
355         return timeout;
356 }
357 
358 
359 /*
360  *  Digi Wakeup Write
361  *
362  *  Wake up port, line discipline, and tty processes sleeping
363  *  on writes.
364  */
365 
366 static void digi_wakeup_write_lock(struct work_struct *work)
367 {
368         struct digi_port *priv =
369                         container_of(work, struct digi_port, dp_wakeup_work);
370         struct usb_serial_port *port = priv->dp_port;
371         unsigned long flags;
372 
373         spin_lock_irqsave(&priv->dp_port_lock, flags);
374         tty_port_tty_wakeup(&port->port);
375         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
376 }
377 
378 /*
379  *  Digi Write OOB Command
380  *
381  *  Write commands on the out of band port.  Commands are 4
382  *  bytes each, multiple commands can be sent at once, and
383  *  no command will be split across USB packets.  Returns 0
384  *  if successful, -EINTR if interrupted while sleeping and
385  *  the interruptible flag is true, or a negative error
386  *  returned by usb_submit_urb.
387  */
388 
389 static int digi_write_oob_command(struct usb_serial_port *port,
390         unsigned char *buf, int count, int interruptible)
391 {
392         int ret = 0;
393         int len;
394         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
395         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
396         unsigned long flags = 0;
397 
398         dev_dbg(&port->dev,
399                 "digi_write_oob_command: TOP: port=%d, count=%d\n",
400                 oob_priv->dp_port_num, count);
401 
402         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
403         while (count > 0) {
404                 while (oob_priv->dp_write_urb_in_use) {
405                         cond_wait_interruptible_timeout_irqrestore(
406                                 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
407                                 &oob_priv->dp_port_lock, flags);
408                         if (interruptible && signal_pending(current))
409                                 return -EINTR;
410                         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
411                 }
412 
413                 /* len must be a multiple of 4, so commands are not split */
414                 len = min(count, oob_port->bulk_out_size);
415                 if (len > 4)
416                         len &= ~3;
417                 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
418                 oob_port->write_urb->transfer_buffer_length = len;
419                 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
420                 if (ret == 0) {
421                         oob_priv->dp_write_urb_in_use = 1;
422                         count -= len;
423                         buf += len;
424                 }
425         }
426         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
427         if (ret)
428                 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
429                         __func__, ret);
430         return ret;
431 
432 }
433 
434 
435 /*
436  *  Digi Write In Band Command
437  *
438  *  Write commands on the given port.  Commands are 4
439  *  bytes each, multiple commands can be sent at once, and
440  *  no command will be split across USB packets.  If timeout
441  *  is non-zero, write in band command will return after
442  *  waiting unsuccessfully for the URB status to clear for
443  *  timeout ticks.  Returns 0 if successful, or a negative
444  *  error returned by digi_write.
445  */
446 
447 static int digi_write_inb_command(struct usb_serial_port *port,
448         unsigned char *buf, int count, unsigned long timeout)
449 {
450         int ret = 0;
451         int len;
452         struct digi_port *priv = usb_get_serial_port_data(port);
453         unsigned char *data = port->write_urb->transfer_buffer;
454         unsigned long flags = 0;
455 
456         dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
457                 priv->dp_port_num, count);
458 
459         if (timeout)
460                 timeout += jiffies;
461         else
462                 timeout = ULONG_MAX;
463 
464         spin_lock_irqsave(&priv->dp_port_lock, flags);
465         while (count > 0 && ret == 0) {
466                 while (priv->dp_write_urb_in_use &&
467                        time_before(jiffies, timeout)) {
468                         cond_wait_interruptible_timeout_irqrestore(
469                                 &port->write_wait, DIGI_RETRY_TIMEOUT,
470                                 &priv->dp_port_lock, flags);
471                         if (signal_pending(current))
472                                 return -EINTR;
473                         spin_lock_irqsave(&priv->dp_port_lock, flags);
474                 }
475 
476                 /* len must be a multiple of 4 and small enough to */
477                 /* guarantee the write will send buffered data first, */
478                 /* so commands are in order with data and not split */
479                 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
480                 if (len > 4)
481                         len &= ~3;
482 
483                 /* write any buffered data first */
484                 if (priv->dp_out_buf_len > 0) {
485                         data[0] = DIGI_CMD_SEND_DATA;
486                         data[1] = priv->dp_out_buf_len;
487                         memcpy(data + 2, priv->dp_out_buf,
488                                 priv->dp_out_buf_len);
489                         memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
490                         port->write_urb->transfer_buffer_length
491                                 = priv->dp_out_buf_len + 2 + len;
492                 } else {
493                         memcpy(data, buf, len);
494                         port->write_urb->transfer_buffer_length = len;
495                 }
496 
497                 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
498                 if (ret == 0) {
499                         priv->dp_write_urb_in_use = 1;
500                         priv->dp_out_buf_len = 0;
501                         count -= len;
502                         buf += len;
503                 }
504 
505         }
506         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
507 
508         if (ret)
509                 dev_err(&port->dev,
510                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
511                         __func__, ret, priv->dp_port_num);
512         return ret;
513 }
514 
515 
516 /*
517  *  Digi Set Modem Signals
518  *
519  *  Sets or clears DTR and RTS on the port, according to the
520  *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
521  *  for the modem_signals argument.  Returns 0 if successful,
522  *  -EINTR if interrupted while sleeping, or a non-zero error
523  *  returned by usb_submit_urb.
524  */
525 
526 static int digi_set_modem_signals(struct usb_serial_port *port,
527         unsigned int modem_signals, int interruptible)
528 {
529 
530         int ret;
531         struct digi_port *port_priv = usb_get_serial_port_data(port);
532         struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
533         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
534         unsigned char *data = oob_port->write_urb->transfer_buffer;
535         unsigned long flags = 0;
536 
537 
538         dev_dbg(&port->dev,
539                 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
540                 port_priv->dp_port_num, modem_signals);
541 
542         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
543         spin_lock(&port_priv->dp_port_lock);
544 
545         while (oob_priv->dp_write_urb_in_use) {
546                 spin_unlock(&port_priv->dp_port_lock);
547                 cond_wait_interruptible_timeout_irqrestore(
548                         &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
549                         &oob_priv->dp_port_lock, flags);
550                 if (interruptible && signal_pending(current))
551                         return -EINTR;
552                 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
553                 spin_lock(&port_priv->dp_port_lock);
554         }
555         data[0] = DIGI_CMD_SET_DTR_SIGNAL;
556         data[1] = port_priv->dp_port_num;
557         data[2] = (modem_signals & TIOCM_DTR) ?
558                                         DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
559         data[3] = 0;
560         data[4] = DIGI_CMD_SET_RTS_SIGNAL;
561         data[5] = port_priv->dp_port_num;
562         data[6] = (modem_signals & TIOCM_RTS) ?
563                                         DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
564         data[7] = 0;
565 
566         oob_port->write_urb->transfer_buffer_length = 8;
567 
568         ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
569         if (ret == 0) {
570                 oob_priv->dp_write_urb_in_use = 1;
571                 port_priv->dp_modem_signals =
572                         (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
573                         | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
574         }
575         spin_unlock(&port_priv->dp_port_lock);
576         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
577         if (ret)
578                 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
579                         __func__, ret);
580         return ret;
581 }
582 
583 /*
584  *  Digi Transmit Idle
585  *
586  *  Digi transmit idle waits, up to timeout ticks, for the transmitter
587  *  to go idle.  It returns 0 if successful or a negative error.
588  *
589  *  There are race conditions here if more than one process is calling
590  *  digi_transmit_idle on the same port at the same time.  However, this
591  *  is only called from close, and only one process can be in close on a
592  *  port at a time, so its ok.
593  */
594 
595 static int digi_transmit_idle(struct usb_serial_port *port,
596         unsigned long timeout)
597 {
598         int ret;
599         unsigned char buf[2];
600         struct digi_port *priv = usb_get_serial_port_data(port);
601         unsigned long flags = 0;
602 
603         spin_lock_irqsave(&priv->dp_port_lock, flags);
604         priv->dp_transmit_idle = 0;
605         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
606 
607         buf[0] = DIGI_CMD_TRANSMIT_IDLE;
608         buf[1] = 0;
609 
610         timeout += jiffies;
611 
612         ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
613         if (ret != 0)
614                 return ret;
615 
616         spin_lock_irqsave(&priv->dp_port_lock, flags);
617 
618         while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
619                 cond_wait_interruptible_timeout_irqrestore(
620                         &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
621                         &priv->dp_port_lock, flags);
622                 if (signal_pending(current))
623                         return -EINTR;
624                 spin_lock_irqsave(&priv->dp_port_lock, flags);
625         }
626         priv->dp_transmit_idle = 0;
627         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
628         return 0;
629 
630 }
631 
632 
633 static void digi_rx_throttle(struct tty_struct *tty)
634 {
635         unsigned long flags;
636         struct usb_serial_port *port = tty->driver_data;
637         struct digi_port *priv = usb_get_serial_port_data(port);
638 
639         /* stop receiving characters by not resubmitting the read urb */
640         spin_lock_irqsave(&priv->dp_port_lock, flags);
641         priv->dp_throttled = 1;
642         priv->dp_throttle_restart = 0;
643         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
644 }
645 
646 
647 static void digi_rx_unthrottle(struct tty_struct *tty)
648 {
649         int ret = 0;
650         unsigned long flags;
651         struct usb_serial_port *port = tty->driver_data;
652         struct digi_port *priv = usb_get_serial_port_data(port);
653 
654         spin_lock_irqsave(&priv->dp_port_lock, flags);
655 
656         /* restart read chain */
657         if (priv->dp_throttle_restart)
658                 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
659 
660         /* turn throttle off */
661         priv->dp_throttled = 0;
662         priv->dp_throttle_restart = 0;
663 
664         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
665 
666         if (ret)
667                 dev_err(&port->dev,
668                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
669                         __func__, ret, priv->dp_port_num);
670 }
671 
672 
673 static void digi_set_termios(struct tty_struct *tty,
674                 struct usb_serial_port *port, struct ktermios *old_termios)
675 {
676         struct digi_port *priv = usb_get_serial_port_data(port);
677         struct device *dev = &port->dev;
678         unsigned int iflag = tty->termios.c_iflag;
679         unsigned int cflag = tty->termios.c_cflag;
680         unsigned int old_iflag = old_termios->c_iflag;
681         unsigned int old_cflag = old_termios->c_cflag;
682         unsigned char buf[32];
683         unsigned int modem_signals;
684         int arg, ret;
685         int i = 0;
686         speed_t baud;
687 
688         dev_dbg(dev,
689                 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
690                 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
691 
692         /* set baud rate */
693         baud = tty_get_baud_rate(tty);
694         if (baud != tty_termios_baud_rate(old_termios)) {
695                 arg = -1;
696 
697                 /* reassert DTR and (maybe) RTS on transition from B0 */
698                 if ((old_cflag&CBAUD) == B0) {
699                         /* don't set RTS if using hardware flow control */
700                         /* and throttling input */
701                         modem_signals = TIOCM_DTR;
702                         if (!(tty->termios.c_cflag & CRTSCTS) ||
703                             !test_bit(TTY_THROTTLED, &tty->flags))
704                                 modem_signals |= TIOCM_RTS;
705                         digi_set_modem_signals(port, modem_signals, 1);
706                 }
707                 switch (baud) {
708                 /* drop DTR and RTS on transition to B0 */
709                 case 0: digi_set_modem_signals(port, 0, 1); break;
710                 case 50: arg = DIGI_BAUD_50; break;
711                 case 75: arg = DIGI_BAUD_75; break;
712                 case 110: arg = DIGI_BAUD_110; break;
713                 case 150: arg = DIGI_BAUD_150; break;
714                 case 200: arg = DIGI_BAUD_200; break;
715                 case 300: arg = DIGI_BAUD_300; break;
716                 case 600: arg = DIGI_BAUD_600; break;
717                 case 1200: arg = DIGI_BAUD_1200; break;
718                 case 1800: arg = DIGI_BAUD_1800; break;
719                 case 2400: arg = DIGI_BAUD_2400; break;
720                 case 4800: arg = DIGI_BAUD_4800; break;
721                 case 9600: arg = DIGI_BAUD_9600; break;
722                 case 19200: arg = DIGI_BAUD_19200; break;
723                 case 38400: arg = DIGI_BAUD_38400; break;
724                 case 57600: arg = DIGI_BAUD_57600; break;
725                 case 115200: arg = DIGI_BAUD_115200; break;
726                 case 230400: arg = DIGI_BAUD_230400; break;
727                 case 460800: arg = DIGI_BAUD_460800; break;
728                 default:
729                         arg = DIGI_BAUD_9600;
730                         baud = 9600;
731                         break;
732                 }
733                 if (arg != -1) {
734                         buf[i++] = DIGI_CMD_SET_BAUD_RATE;
735                         buf[i++] = priv->dp_port_num;
736                         buf[i++] = arg;
737                         buf[i++] = 0;
738                 }
739         }
740         /* set parity */
741         tty->termios.c_cflag &= ~CMSPAR;
742 
743         if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
744                 if (cflag&PARENB) {
745                         if (cflag&PARODD)
746                                 arg = DIGI_PARITY_ODD;
747                         else
748                                 arg = DIGI_PARITY_EVEN;
749                 } else {
750                         arg = DIGI_PARITY_NONE;
751                 }
752                 buf[i++] = DIGI_CMD_SET_PARITY;
753                 buf[i++] = priv->dp_port_num;
754                 buf[i++] = arg;
755                 buf[i++] = 0;
756         }
757         /* set word size */
758         if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
759                 arg = -1;
760                 switch (cflag&CSIZE) {
761                 case CS5: arg = DIGI_WORD_SIZE_5; break;
762                 case CS6: arg = DIGI_WORD_SIZE_6; break;
763                 case CS7: arg = DIGI_WORD_SIZE_7; break;
764                 case CS8: arg = DIGI_WORD_SIZE_8; break;
765                 default:
766                         dev_dbg(dev,
767                                 "digi_set_termios: can't handle word size %d\n",
768                                 (cflag&CSIZE));
769                         break;
770                 }
771 
772                 if (arg != -1) {
773                         buf[i++] = DIGI_CMD_SET_WORD_SIZE;
774                         buf[i++] = priv->dp_port_num;
775                         buf[i++] = arg;
776                         buf[i++] = 0;
777                 }
778 
779         }
780 
781         /* set stop bits */
782         if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
783 
784                 if ((cflag&CSTOPB))
785                         arg = DIGI_STOP_BITS_2;
786                 else
787                         arg = DIGI_STOP_BITS_1;
788 
789                 buf[i++] = DIGI_CMD_SET_STOP_BITS;
790                 buf[i++] = priv->dp_port_num;
791                 buf[i++] = arg;
792                 buf[i++] = 0;
793 
794         }
795 
796         /* set input flow control */
797         if ((iflag&IXOFF) != (old_iflag&IXOFF)
798             || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
799                 arg = 0;
800                 if (iflag&IXOFF)
801                         arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
802                 else
803                         arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
804 
805                 if (cflag&CRTSCTS) {
806                         arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
807 
808                         /* On USB-4 it is necessary to assert RTS prior */
809                         /* to selecting RTS input flow control.  */
810                         buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
811                         buf[i++] = priv->dp_port_num;
812                         buf[i++] = DIGI_RTS_ACTIVE;
813                         buf[i++] = 0;
814 
815                 } else {
816                         arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
817                 }
818                 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
819                 buf[i++] = priv->dp_port_num;
820                 buf[i++] = arg;
821                 buf[i++] = 0;
822         }
823 
824         /* set output flow control */
825         if ((iflag & IXON) != (old_iflag & IXON)
826             || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
827                 arg = 0;
828                 if (iflag & IXON)
829                         arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
830                 else
831                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
832 
833                 if (cflag & CRTSCTS) {
834                         arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
835                 } else {
836                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
837                 }
838 
839                 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
840                 buf[i++] = priv->dp_port_num;
841                 buf[i++] = arg;
842                 buf[i++] = 0;
843         }
844 
845         /* set receive enable/disable */
846         if ((cflag & CREAD) != (old_cflag & CREAD)) {
847                 if (cflag & CREAD)
848                         arg = DIGI_ENABLE;
849                 else
850                         arg = DIGI_DISABLE;
851 
852                 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
853                 buf[i++] = priv->dp_port_num;
854                 buf[i++] = arg;
855                 buf[i++] = 0;
856         }
857         ret = digi_write_oob_command(port, buf, i, 1);
858         if (ret != 0)
859                 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
860         tty_encode_baud_rate(tty, baud, baud);
861 }
862 
863 
864 static void digi_break_ctl(struct tty_struct *tty, int break_state)
865 {
866         struct usb_serial_port *port = tty->driver_data;
867         unsigned char buf[4];
868 
869         buf[0] = DIGI_CMD_BREAK_CONTROL;
870         buf[1] = 2;                             /* length */
871         buf[2] = break_state ? 1 : 0;
872         buf[3] = 0;                             /* pad */
873         digi_write_inb_command(port, buf, 4, 0);
874 }
875 
876 
877 static int digi_tiocmget(struct tty_struct *tty)
878 {
879         struct usb_serial_port *port = tty->driver_data;
880         struct digi_port *priv = usb_get_serial_port_data(port);
881         unsigned int val;
882         unsigned long flags;
883 
884         spin_lock_irqsave(&priv->dp_port_lock, flags);
885         val = priv->dp_modem_signals;
886         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
887         return val;
888 }
889 
890 
891 static int digi_tiocmset(struct tty_struct *tty,
892                                         unsigned int set, unsigned int clear)
893 {
894         struct usb_serial_port *port = tty->driver_data;
895         struct digi_port *priv = usb_get_serial_port_data(port);
896         unsigned int val;
897         unsigned long flags;
898 
899         spin_lock_irqsave(&priv->dp_port_lock, flags);
900         val = (priv->dp_modem_signals & ~clear) | set;
901         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
902         return digi_set_modem_signals(port, val, 1);
903 }
904 
905 
906 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
907                                         const unsigned char *buf, int count)
908 {
909 
910         int ret, data_len, new_len;
911         struct digi_port *priv = usb_get_serial_port_data(port);
912         unsigned char *data = port->write_urb->transfer_buffer;
913         unsigned long flags = 0;
914 
915         dev_dbg(&port->dev,
916                 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
917                 priv->dp_port_num, count, in_interrupt());
918 
919         /* copy user data (which can sleep) before getting spin lock */
920         count = min(count, port->bulk_out_size-2);
921         count = min(64, count);
922 
923         /* be sure only one write proceeds at a time */
924         /* there are races on the port private buffer */
925         spin_lock_irqsave(&priv->dp_port_lock, flags);
926 
927         /* wait for urb status clear to submit another urb */
928         if (priv->dp_write_urb_in_use) {
929                 /* buffer data if count is 1 (probably put_char) if possible */
930                 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
931                         priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
932                         new_len = 1;
933                 } else {
934                         new_len = 0;
935                 }
936                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
937                 return new_len;
938         }
939 
940         /* allow space for any buffered data and for new data, up to */
941         /* transfer buffer size - 2 (for command and length bytes) */
942         new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
943         data_len = new_len + priv->dp_out_buf_len;
944 
945         if (data_len == 0) {
946                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
947                 return 0;
948         }
949 
950         port->write_urb->transfer_buffer_length = data_len+2;
951 
952         *data++ = DIGI_CMD_SEND_DATA;
953         *data++ = data_len;
954 
955         /* copy in buffered data first */
956         memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
957         data += priv->dp_out_buf_len;
958 
959         /* copy in new data */
960         memcpy(data, buf, new_len);
961 
962         ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
963         if (ret == 0) {
964                 priv->dp_write_urb_in_use = 1;
965                 ret = new_len;
966                 priv->dp_out_buf_len = 0;
967         }
968 
969         /* return length of new data written, or error */
970         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
971         if (ret < 0)
972                 dev_err_console(port,
973                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
974                         __func__, ret, priv->dp_port_num);
975         dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
976         return ret;
977 
978 }
979 
980 static void digi_write_bulk_callback(struct urb *urb)
981 {
982 
983         struct usb_serial_port *port = urb->context;
984         struct usb_serial *serial;
985         struct digi_port *priv;
986         struct digi_serial *serial_priv;
987         int ret = 0;
988         int status = urb->status;
989 
990         /* port and serial sanity check */
991         if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
992                 pr_err("%s: port or port->private is NULL, status=%d\n",
993                         __func__, status);
994                 return;
995         }
996         serial = port->serial;
997         if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
998                 dev_err(&port->dev,
999                         "%s: serial or serial->private is NULL, status=%d\n",
1000                         __func__, status);
1001                 return;
1002         }
1003 
1004         /* handle oob callback */
1005         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1006                 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
1007                 spin_lock(&priv->dp_port_lock);
1008                 priv->dp_write_urb_in_use = 0;
1009                 wake_up_interruptible(&port->write_wait);
1010                 spin_unlock(&priv->dp_port_lock);
1011                 return;
1012         }
1013 
1014         /* try to send any buffered data on this port */
1015         spin_lock(&priv->dp_port_lock);
1016         priv->dp_write_urb_in_use = 0;
1017         if (priv->dp_out_buf_len > 0) {
1018                 *((unsigned char *)(port->write_urb->transfer_buffer))
1019                         = (unsigned char)DIGI_CMD_SEND_DATA;
1020                 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1021                         = (unsigned char)priv->dp_out_buf_len;
1022                 port->write_urb->transfer_buffer_length =
1023                                                 priv->dp_out_buf_len + 2;
1024                 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1025                         priv->dp_out_buf_len);
1026                 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1027                 if (ret == 0) {
1028                         priv->dp_write_urb_in_use = 1;
1029                         priv->dp_out_buf_len = 0;
1030                 }
1031         }
1032         /* wake up processes sleeping on writes immediately */
1033         tty_port_tty_wakeup(&port->port);
1034         /* also queue up a wakeup at scheduler time, in case we */
1035         /* lost the race in write_chan(). */
1036         schedule_work(&priv->dp_wakeup_work);
1037 
1038         spin_unlock(&priv->dp_port_lock);
1039         if (ret && ret != -EPERM)
1040                 dev_err_console(port,
1041                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1042                         __func__, ret, priv->dp_port_num);
1043 }
1044 
1045 static int digi_write_room(struct tty_struct *tty)
1046 {
1047         struct usb_serial_port *port = tty->driver_data;
1048         struct digi_port *priv = usb_get_serial_port_data(port);
1049         int room;
1050         unsigned long flags = 0;
1051 
1052         spin_lock_irqsave(&priv->dp_port_lock, flags);
1053 
1054         if (priv->dp_write_urb_in_use)
1055                 room = 0;
1056         else
1057                 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1058 
1059         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1060         dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
1061         return room;
1062 
1063 }
1064 
1065 static int digi_chars_in_buffer(struct tty_struct *tty)
1066 {
1067         struct usb_serial_port *port = tty->driver_data;
1068         struct digi_port *priv = usb_get_serial_port_data(port);
1069 
1070         if (priv->dp_write_urb_in_use) {
1071                 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1072                         priv->dp_port_num, port->bulk_out_size - 2);
1073                 /* return(port->bulk_out_size - 2); */
1074                 return 256;
1075         } else {
1076                 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1077                         priv->dp_port_num, priv->dp_out_buf_len);
1078                 return priv->dp_out_buf_len;
1079         }
1080 
1081 }
1082 
1083 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1084 {
1085         /* Adjust DTR and RTS */
1086         digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1087 }
1088 
1089 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1090 {
1091         int ret;
1092         unsigned char buf[32];
1093         struct digi_port *priv = usb_get_serial_port_data(port);
1094         struct ktermios not_termios;
1095 
1096         /* be sure the device is started up */
1097         if (digi_startup_device(port->serial) != 0)
1098                 return -ENXIO;
1099 
1100         /* read modem signals automatically whenever they change */
1101         buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1102         buf[1] = priv->dp_port_num;
1103         buf[2] = DIGI_ENABLE;
1104         buf[3] = 0;
1105 
1106         /* flush fifos */
1107         buf[4] = DIGI_CMD_IFLUSH_FIFO;
1108         buf[5] = priv->dp_port_num;
1109         buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1110         buf[7] = 0;
1111 
1112         ret = digi_write_oob_command(port, buf, 8, 1);
1113         if (ret != 0)
1114                 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1115 
1116         /* set termios settings */
1117         if (tty) {
1118                 not_termios.c_cflag = ~tty->termios.c_cflag;
1119                 not_termios.c_iflag = ~tty->termios.c_iflag;
1120                 digi_set_termios(tty, port, &not_termios);
1121         }
1122         return 0;
1123 }
1124 
1125 
1126 static void digi_close(struct usb_serial_port *port)
1127 {
1128         DEFINE_WAIT(wait);
1129         int ret;
1130         unsigned char buf[32];
1131         struct digi_port *priv = usb_get_serial_port_data(port);
1132 
1133         mutex_lock(&port->serial->disc_mutex);
1134         /* if disconnected, just clear flags */
1135         if (port->serial->disconnected)
1136                 goto exit;
1137 
1138         /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1139         digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1140 
1141         /* disable input flow control */
1142         buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1143         buf[1] = priv->dp_port_num;
1144         buf[2] = DIGI_DISABLE;
1145         buf[3] = 0;
1146 
1147         /* disable output flow control */
1148         buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1149         buf[5] = priv->dp_port_num;
1150         buf[6] = DIGI_DISABLE;
1151         buf[7] = 0;
1152 
1153         /* disable reading modem signals automatically */
1154         buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1155         buf[9] = priv->dp_port_num;
1156         buf[10] = DIGI_DISABLE;
1157         buf[11] = 0;
1158 
1159         /* disable receive */
1160         buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1161         buf[13] = priv->dp_port_num;
1162         buf[14] = DIGI_DISABLE;
1163         buf[15] = 0;
1164 
1165         /* flush fifos */
1166         buf[16] = DIGI_CMD_IFLUSH_FIFO;
1167         buf[17] = priv->dp_port_num;
1168         buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1169         buf[19] = 0;
1170 
1171         ret = digi_write_oob_command(port, buf, 20, 0);
1172         if (ret != 0)
1173                 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",
1174                                                                         ret);
1175         /* wait for final commands on oob port to complete */
1176         prepare_to_wait(&priv->dp_flush_wait, &wait,
1177                         TASK_INTERRUPTIBLE);
1178         schedule_timeout(DIGI_CLOSE_TIMEOUT);
1179         finish_wait(&priv->dp_flush_wait, &wait);
1180 
1181         /* shutdown any outstanding bulk writes */
1182         usb_kill_urb(port->write_urb);
1183 exit:
1184         spin_lock_irq(&priv->dp_port_lock);
1185         priv->dp_write_urb_in_use = 0;
1186         wake_up_interruptible(&priv->dp_close_wait);
1187         spin_unlock_irq(&priv->dp_port_lock);
1188         mutex_unlock(&port->serial->disc_mutex);
1189 }
1190 
1191 
1192 /*
1193  *  Digi Startup Device
1194  *
1195  *  Starts reads on all ports.  Must be called AFTER startup, with
1196  *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1197  */
1198 
1199 static int digi_startup_device(struct usb_serial *serial)
1200 {
1201         int i, ret = 0;
1202         struct digi_serial *serial_priv = usb_get_serial_data(serial);
1203         struct usb_serial_port *port;
1204 
1205         /* be sure this happens exactly once */
1206         spin_lock(&serial_priv->ds_serial_lock);
1207         if (serial_priv->ds_device_started) {
1208                 spin_unlock(&serial_priv->ds_serial_lock);
1209                 return 0;
1210         }
1211         serial_priv->ds_device_started = 1;
1212         spin_unlock(&serial_priv->ds_serial_lock);
1213 
1214         /* start reading from each bulk in endpoint for the device */
1215         /* set USB_DISABLE_SPD flag for write bulk urbs */
1216         for (i = 0; i < serial->type->num_ports + 1; i++) {
1217                 port = serial->port[i];
1218                 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1219                 if (ret != 0) {
1220                         dev_err(&port->dev,
1221                                 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1222                                 __func__, ret, i);
1223                         break;
1224                 }
1225         }
1226         return ret;
1227 }
1228 
1229 static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1230 {
1231         struct digi_port *priv;
1232 
1233         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1234         if (!priv)
1235                 return -ENOMEM;
1236 
1237         spin_lock_init(&priv->dp_port_lock);
1238         priv->dp_port_num = port_num;
1239         init_waitqueue_head(&priv->dp_transmit_idle_wait);
1240         init_waitqueue_head(&priv->dp_flush_wait);
1241         init_waitqueue_head(&priv->dp_close_wait);
1242         INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1243         priv->dp_port = port;
1244 
1245         init_waitqueue_head(&port->write_wait);
1246 
1247         usb_set_serial_port_data(port, priv);
1248 
1249         return 0;
1250 }
1251 
1252 static int digi_startup(struct usb_serial *serial)
1253 {
1254         struct digi_serial *serial_priv;
1255         int ret;
1256 
1257         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1258         if (!serial_priv)
1259                 return -ENOMEM;
1260 
1261         spin_lock_init(&serial_priv->ds_serial_lock);
1262         serial_priv->ds_oob_port_num = serial->type->num_ports;
1263         serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1264 
1265         ret = digi_port_init(serial_priv->ds_oob_port,
1266                                                 serial_priv->ds_oob_port_num);
1267         if (ret) {
1268                 kfree(serial_priv);
1269                 return ret;
1270         }
1271 
1272         usb_set_serial_data(serial, serial_priv);
1273 
1274         return 0;
1275 }
1276 
1277 
1278 static void digi_disconnect(struct usb_serial *serial)
1279 {
1280         int i;
1281 
1282         /* stop reads and writes on all ports */
1283         for (i = 0; i < serial->type->num_ports + 1; i++) {
1284                 usb_kill_urb(serial->port[i]->read_urb);
1285                 usb_kill_urb(serial->port[i]->write_urb);
1286         }
1287 }
1288 
1289 
1290 static void digi_release(struct usb_serial *serial)
1291 {
1292         struct digi_serial *serial_priv;
1293         struct digi_port *priv;
1294 
1295         serial_priv = usb_get_serial_data(serial);
1296 
1297         priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
1298         kfree(priv);
1299 
1300         kfree(serial_priv);
1301 }
1302 
1303 static int digi_port_probe(struct usb_serial_port *port)
1304 {
1305         return digi_port_init(port, port->port_number);
1306 }
1307 
1308 static int digi_port_remove(struct usb_serial_port *port)
1309 {
1310         struct digi_port *priv;
1311 
1312         priv = usb_get_serial_port_data(port);
1313         kfree(priv);
1314 
1315         return 0;
1316 }
1317 
1318 static void digi_read_bulk_callback(struct urb *urb)
1319 {
1320         struct usb_serial_port *port = urb->context;
1321         struct digi_port *priv;
1322         struct digi_serial *serial_priv;
1323         int ret;
1324         int status = urb->status;
1325 
1326         /* port sanity check, do not resubmit if port is not valid */
1327         if (port == NULL)
1328                 return;
1329         priv = usb_get_serial_port_data(port);
1330         if (priv == NULL) {
1331                 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1332                         __func__, status);
1333                 return;
1334         }
1335         if (port->serial == NULL ||
1336                 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1337                 dev_err(&port->dev, "%s: serial is bad or serial->private "
1338                         "is NULL, status=%d\n", __func__, status);
1339                 return;
1340         }
1341 
1342         /* do not resubmit urb if it has any status error */
1343         if (status) {
1344                 dev_err(&port->dev,
1345                         "%s: nonzero read bulk status: status=%d, port=%d\n",
1346                         __func__, status, priv->dp_port_num);
1347                 return;
1348         }
1349 
1350         /* handle oob or inb callback, do not resubmit if error */
1351         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1352                 if (digi_read_oob_callback(urb) != 0)
1353                         return;
1354         } else {
1355                 if (digi_read_inb_callback(urb) != 0)
1356                         return;
1357         }
1358 
1359         /* continue read */
1360         ret = usb_submit_urb(urb, GFP_ATOMIC);
1361         if (ret != 0 && ret != -EPERM) {
1362                 dev_err(&port->dev,
1363                         "%s: failed resubmitting urb, ret=%d, port=%d\n",
1364                         __func__, ret, priv->dp_port_num);
1365         }
1366 
1367 }
1368 
1369 /*
1370  *  Digi Read INB Callback
1371  *
1372  *  Digi Read INB Callback handles reads on the in band ports, sending
1373  *  the data on to the tty subsystem.  When called we know port and
1374  *  port->private are not NULL and port->serial has been validated.
1375  *  It returns 0 if successful, 1 if successful but the port is
1376  *  throttled, and -1 if the sanity checks failed.
1377  */
1378 
1379 static int digi_read_inb_callback(struct urb *urb)
1380 {
1381         struct usb_serial_port *port = urb->context;
1382         struct digi_port *priv = usb_get_serial_port_data(port);
1383         int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1384         int len = ((unsigned char *)urb->transfer_buffer)[1];
1385         int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1386         unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1387         int flag, throttled;
1388         int status = urb->status;
1389 
1390         /* do not process callbacks on closed ports */
1391         /* but do continue the read chain */
1392         if (urb->status == -ENOENT)
1393                 return 0;
1394 
1395         /* short/multiple packet check */
1396         if (urb->actual_length != len + 2) {
1397                 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1398                         "status=%d, port=%d, opcode=%d, len=%d, "
1399                         "actual_length=%d, status=%d\n", __func__, status,
1400                         priv->dp_port_num, opcode, len, urb->actual_length,
1401                         port_status);
1402                 return -1;
1403         }
1404 
1405         spin_lock(&priv->dp_port_lock);
1406 
1407         /* check for throttle; if set, do not resubmit read urb */
1408         /* indicate the read chain needs to be restarted on unthrottle */
1409         throttled = priv->dp_throttled;
1410         if (throttled)
1411                 priv->dp_throttle_restart = 1;
1412 
1413         /* receive data */
1414         if (opcode == DIGI_CMD_RECEIVE_DATA) {
1415                 /* get flag from port_status */
1416                 flag = 0;
1417 
1418                 /* overrun is special, not associated with a char */
1419                 if (port_status & DIGI_OVERRUN_ERROR)
1420                         tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1421 
1422                 /* break takes precedence over parity, */
1423                 /* which takes precedence over framing errors */
1424                 if (port_status & DIGI_BREAK_ERROR)
1425                         flag = TTY_BREAK;
1426                 else if (port_status & DIGI_PARITY_ERROR)
1427                         flag = TTY_PARITY;
1428                 else if (port_status & DIGI_FRAMING_ERROR)
1429                         flag = TTY_FRAME;
1430 
1431                 /* data length is len-1 (one byte of len is port_status) */
1432                 --len;
1433                 if (len > 0) {
1434                         tty_insert_flip_string_fixed_flag(&port->port, data,
1435                                         flag, len);
1436                         tty_flip_buffer_push(&port->port);
1437                 }
1438         }
1439         spin_unlock(&priv->dp_port_lock);
1440 
1441         if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1442                 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1443         else if (opcode != DIGI_CMD_RECEIVE_DATA)
1444                 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1445 
1446         return throttled ? 1 : 0;
1447 
1448 }
1449 
1450 
1451 /*
1452  *  Digi Read OOB Callback
1453  *
1454  *  Digi Read OOB Callback handles reads on the out of band port.
1455  *  When called we know port and port->private are not NULL and
1456  *  the port->serial is valid.  It returns 0 if successful, and
1457  *  -1 if the sanity checks failed.
1458  */
1459 
1460 static int digi_read_oob_callback(struct urb *urb)
1461 {
1462 
1463         struct usb_serial_port *port = urb->context;
1464         struct usb_serial *serial = port->serial;
1465         struct tty_struct *tty;
1466         struct digi_port *priv = usb_get_serial_port_data(port);
1467         int opcode, line, status, val;
1468         int i;
1469         unsigned int rts;
1470 
1471         /* handle each oob command */
1472         for (i = 0; i < urb->actual_length - 3;) {
1473                 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1474                 line = ((unsigned char *)urb->transfer_buffer)[i++];
1475                 status = ((unsigned char *)urb->transfer_buffer)[i++];
1476                 val = ((unsigned char *)urb->transfer_buffer)[i++];
1477 
1478                 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1479                         opcode, line, status, val);
1480 
1481                 if (status != 0 || line >= serial->type->num_ports)
1482                         continue;
1483 
1484                 port = serial->port[line];
1485 
1486                 priv = usb_get_serial_port_data(port);
1487                 if (priv == NULL)
1488                         return -1;
1489 
1490                 tty = tty_port_tty_get(&port->port);
1491 
1492                 rts = 0;
1493                 if (tty)
1494                         rts = tty->termios.c_cflag & CRTSCTS;
1495                 
1496                 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1497                         spin_lock(&priv->dp_port_lock);
1498                         /* convert from digi flags to termiox flags */
1499                         if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1500                                 priv->dp_modem_signals |= TIOCM_CTS;
1501                                 /* port must be open to use tty struct */
1502                                 if (rts)
1503                                         tty_port_tty_wakeup(&port->port);
1504                         } else {
1505                                 priv->dp_modem_signals &= ~TIOCM_CTS;
1506                                 /* port must be open to use tty struct */
1507                         }
1508                         if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1509                                 priv->dp_modem_signals |= TIOCM_DSR;
1510                         else
1511                                 priv->dp_modem_signals &= ~TIOCM_DSR;
1512                         if (val & DIGI_READ_INPUT_SIGNALS_RI)
1513                                 priv->dp_modem_signals |= TIOCM_RI;
1514                         else
1515                                 priv->dp_modem_signals &= ~TIOCM_RI;
1516                         if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1517                                 priv->dp_modem_signals |= TIOCM_CD;
1518                         else
1519                                 priv->dp_modem_signals &= ~TIOCM_CD;
1520 
1521                         spin_unlock(&priv->dp_port_lock);
1522                 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1523                         spin_lock(&priv->dp_port_lock);
1524                         priv->dp_transmit_idle = 1;
1525                         wake_up_interruptible(&priv->dp_transmit_idle_wait);
1526                         spin_unlock(&priv->dp_port_lock);
1527                 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1528                         wake_up_interruptible(&priv->dp_flush_wait);
1529                 }
1530                 tty_kref_put(tty);
1531         }
1532         return 0;
1533 
1534 }
1535 
1536 module_usb_serial_driver(serial_drivers, id_table_combined);
1537 
1538 MODULE_AUTHOR(DRIVER_AUTHOR);
1539 MODULE_DESCRIPTION(DRIVER_DESC);
1540 MODULE_LICENSE("GPL");
1541 

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