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sfc: Don't use enums as a bitmask.
[zen-stable.git] / drivers / usb / serial / oti6858.c
blob4c29e6c2bda7aaf9ca6529069301edbf207f209d
1 /*
2 * Ours Technology Inc. OTi-6858 USB to serial adapter driver.
3 *
4 * Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20)
5 * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail)
6 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2003 IBM Corp.
8 *
9 * Many thanks to the authors of pl2303 driver: all functions in this file
10 * are heavily based on pl2303 code, buffering code is a 1-to-1 copy.
11 *
12 * Warning! You use this driver on your own risk! The only official
13 * description of this device I have is datasheet from manufacturer,
14 * and it doesn't contain almost any information needed to write a driver.
15 * Almost all knowlegde used while writing this driver was gathered by:
16 * - analyzing traffic between device and the M$ Windows 2000 driver,
17 * - trying different bit combinations and checking pin states
18 * with a voltmeter,
19 * - receiving malformed frames and producing buffer overflows
20 * to learn how errors are reported,
21 * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE
22 * CONNECTED TO IT!
23 *
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2 of the License.
27 *
28 * See Documentation/usb/usb-serial.txt for more information on using this
29 * driver
30 *
31 * TODO:
32 * - implement correct flushing for ioctls and oti6858_close()
33 * - check how errors (rx overflow, parity error, framing error) are reported
34 * - implement oti6858_break_ctl()
35 * - implement more ioctls
36 * - test/implement flow control
37 * - allow setting custom baud rates
38 */
39
40 #include <linux/kernel.h>
41 #include <linux/errno.h>
42 #include <linux/init.h>
43 #include <linux/slab.h>
44 #include <linux/tty.h>
45 #include <linux/tty_driver.h>
46 #include <linux/tty_flip.h>
47 #include <linux/serial.h>
48 #include <linux/module.h>
49 #include <linux/moduleparam.h>
50 #include <linux/spinlock.h>
51 #include <linux/usb.h>
52 #include <linux/usb/serial.h>
53 #include <linux/uaccess.h>
54 #include <linux/kfifo.h>
55 #include "oti6858.h"
56
57 #define OTI6858_DESCRIPTION \
58 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
59 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
60 #define OTI6858_VERSION "0.2"
61
62 static const struct usb_device_id id_table[] = {
63 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
64 { }
65 };
66
67 MODULE_DEVICE_TABLE(usb, id_table);
68
69 static struct usb_driver oti6858_driver = {
70 .name = "oti6858",
71 .probe = usb_serial_probe,
72 .disconnect = usb_serial_disconnect,
73 .id_table = id_table,
74 .no_dynamic_id = 1,
75 };
76
77 static int debug;
78
79 /* requests */
80 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
81 #define OTI6858_REQ_T_GET_STATUS 0x01
82
83 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
84 #define OTI6858_REQ_T_SET_LINE 0x00
85
86 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
87 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
88
89 /* format of the control packet */
90 struct oti6858_control_pkt {
91 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
92 #define OTI6858_MAX_BAUD_RATE 3000000
93 u8 frame_fmt;
94 #define FMT_STOP_BITS_MASK 0xc0
95 #define FMT_STOP_BITS_1 0x00
96 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
97 #define FMT_PARITY_MASK 0x38
98 #define FMT_PARITY_NONE 0x00
99 #define FMT_PARITY_ODD 0x08
100 #define FMT_PARITY_EVEN 0x18
101 #define FMT_PARITY_MARK 0x28
102 #define FMT_PARITY_SPACE 0x38
103 #define FMT_DATA_BITS_MASK 0x03
104 #define FMT_DATA_BITS_5 0x00
105 #define FMT_DATA_BITS_6 0x01
106 #define FMT_DATA_BITS_7 0x02
107 #define FMT_DATA_BITS_8 0x03
108 u8 something; /* always equals 0x43 */
109 u8 control; /* settings of flow control lines */
110 #define CONTROL_MASK 0x0c
111 #define CONTROL_DTR_HIGH 0x08
112 #define CONTROL_RTS_HIGH 0x04
113 u8 tx_status;
114 #define TX_BUFFER_EMPTIED 0x09
115 u8 pin_state;
116 #define PIN_MASK 0x3f
117 #define PIN_RTS 0x20 /* output pin */
118 #define PIN_CTS 0x10 /* input pin, active low */
119 #define PIN_DSR 0x08 /* input pin, active low */
120 #define PIN_DTR 0x04 /* output pin */
121 #define PIN_RI 0x02 /* input pin, active low */
122 #define PIN_DCD 0x01 /* input pin, active low */
123 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
124 };
125
126 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
127 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
128 (((a)->divisor == (priv)->pending_setup.divisor) \
129 && ((a)->control == (priv)->pending_setup.control) \
130 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
131
132 /* function prototypes */
133 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
134 static void oti6858_close(struct usb_serial_port *port);
135 static void oti6858_set_termios(struct tty_struct *tty,
136 struct usb_serial_port *port, struct ktermios *old);
137 static void oti6858_init_termios(struct tty_struct *tty);
138 static int oti6858_ioctl(struct tty_struct *tty,
139 unsigned int cmd, unsigned long arg);
140 static void oti6858_read_int_callback(struct urb *urb);
141 static void oti6858_read_bulk_callback(struct urb *urb);
142 static void oti6858_write_bulk_callback(struct urb *urb);
143 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
144 const unsigned char *buf, int count);
145 static int oti6858_write_room(struct tty_struct *tty);
146 static int oti6858_chars_in_buffer(struct tty_struct *tty);
147 static int oti6858_tiocmget(struct tty_struct *tty);
148 static int oti6858_tiocmset(struct tty_struct *tty,
149 unsigned int set, unsigned int clear);
150 static int oti6858_startup(struct usb_serial *serial);
151 static void oti6858_release(struct usb_serial *serial);
152
153 /* device info */
154 static struct usb_serial_driver oti6858_device = {
155 .driver = {
156 .owner = THIS_MODULE,
157 .name = "oti6858",
158 },
159 .id_table = id_table,
160 .usb_driver = &oti6858_driver,
161 .num_ports = 1,
162 .open = oti6858_open,
163 .close = oti6858_close,
164 .write = oti6858_write,
165 .ioctl = oti6858_ioctl,
166 .set_termios = oti6858_set_termios,
167 .init_termios = oti6858_init_termios,
168 .tiocmget = oti6858_tiocmget,
169 .tiocmset = oti6858_tiocmset,
170 .read_bulk_callback = oti6858_read_bulk_callback,
171 .read_int_callback = oti6858_read_int_callback,
172 .write_bulk_callback = oti6858_write_bulk_callback,
173 .write_room = oti6858_write_room,
174 .chars_in_buffer = oti6858_chars_in_buffer,
175 .attach = oti6858_startup,
176 .release = oti6858_release,
177 };
178
179 struct oti6858_private {
180 spinlock_t lock;
181
182 struct oti6858_control_pkt status;
183
184 struct {
185 u8 read_urb_in_use;
186 u8 write_urb_in_use;
187 } flags;
188 struct delayed_work delayed_write_work;
189
190 struct {
191 __le16 divisor;
192 u8 frame_fmt;
193 u8 control;
194 } pending_setup;
195 u8 transient;
196 u8 setup_done;
197 struct delayed_work delayed_setup_work;
198
199 wait_queue_head_t intr_wait;
200 struct usb_serial_port *port; /* USB port with which associated */
201 };
202
203 static void setup_line(struct work_struct *work)
204 {
205 struct oti6858_private *priv = container_of(work,
206 struct oti6858_private, delayed_setup_work.work);
207 struct usb_serial_port *port = priv->port;
208 struct oti6858_control_pkt *new_setup;
209 unsigned long flags;
210 int result;
211
212 dbg("%s(port = %d)", __func__, port->number);
213
214 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
215 if (new_setup == NULL) {
216 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
217 /* we will try again */
218 schedule_delayed_work(&priv->delayed_setup_work,
219 msecs_to_jiffies(2));
220 return;
221 }
222
223 result = usb_control_msg(port->serial->dev,
224 usb_rcvctrlpipe(port->serial->dev, 0),
225 OTI6858_REQ_T_GET_STATUS,
226 OTI6858_REQ_GET_STATUS,
227 0, 0,
228 new_setup, OTI6858_CTRL_PKT_SIZE,
229 100);
230
231 if (result != OTI6858_CTRL_PKT_SIZE) {
232 dev_err(&port->dev, "%s(): error reading status\n", __func__);
233 kfree(new_setup);
234 /* we will try again */
235 schedule_delayed_work(&priv->delayed_setup_work,
236 msecs_to_jiffies(2));
237 return;
238 }
239
240 spin_lock_irqsave(&priv->lock, flags);
241 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
242 new_setup->divisor = priv->pending_setup.divisor;
243 new_setup->control = priv->pending_setup.control;
244 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
245
246 spin_unlock_irqrestore(&priv->lock, flags);
247 result = usb_control_msg(port->serial->dev,
248 usb_sndctrlpipe(port->serial->dev, 0),
249 OTI6858_REQ_T_SET_LINE,
250 OTI6858_REQ_SET_LINE,
251 0, 0,
252 new_setup, OTI6858_CTRL_PKT_SIZE,
253 100);
254 } else {
255 spin_unlock_irqrestore(&priv->lock, flags);
256 result = 0;
257 }
258 kfree(new_setup);
259
260 spin_lock_irqsave(&priv->lock, flags);
261 if (result != OTI6858_CTRL_PKT_SIZE)
262 priv->transient = 0;
263 priv->setup_done = 1;
264 spin_unlock_irqrestore(&priv->lock, flags);
265
266 dbg("%s(): submitting interrupt urb", __func__);
267 port->interrupt_in_urb->dev = port->serial->dev;
268 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
269 if (result != 0) {
270 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
271 " with error %d\n", __func__, result);
272 }
273 }
274
275 static void send_data(struct work_struct *work)
276 {
277 struct oti6858_private *priv = container_of(work,
278 struct oti6858_private, delayed_write_work.work);
279 struct usb_serial_port *port = priv->port;
280 int count = 0, result;
281 unsigned long flags;
282 u8 *allow;
283
284 dbg("%s(port = %d)", __func__, port->number);
285
286 spin_lock_irqsave(&priv->lock, flags);
287 if (priv->flags.write_urb_in_use) {
288 spin_unlock_irqrestore(&priv->lock, flags);
289 schedule_delayed_work(&priv->delayed_write_work,
290 msecs_to_jiffies(2));
291 return;
292 }
293 priv->flags.write_urb_in_use = 1;
294 spin_unlock_irqrestore(&priv->lock, flags);
295
296 spin_lock_irqsave(&port->lock, flags);
297 count = kfifo_len(&port->write_fifo);
298 spin_unlock_irqrestore(&port->lock, flags);
299
300 if (count > port->bulk_out_size)
301 count = port->bulk_out_size;
302
303 if (count != 0) {
304 allow = kmalloc(1, GFP_KERNEL);
305 if (!allow) {
306 dev_err(&port->dev, "%s(): kmalloc failed\n",
307 __func__);
308 return;
309 }
310 result = usb_control_msg(port->serial->dev,
311 usb_rcvctrlpipe(port->serial->dev, 0),
312 OTI6858_REQ_T_CHECK_TXBUFF,
313 OTI6858_REQ_CHECK_TXBUFF,
314 count, 0, allow, 1, 100);
315 if (result != 1 || *allow != 0)
316 count = 0;
317 kfree(allow);
318 }
319
320 if (count == 0) {
321 priv->flags.write_urb_in_use = 0;
322
323 dbg("%s(): submitting interrupt urb", __func__);
324 port->interrupt_in_urb->dev = port->serial->dev;
325 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
326 if (result != 0) {
327 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
328 " with error %d\n", __func__, result);
329 }
330 return;
331 }
332
333 count = kfifo_out_locked(&port->write_fifo,
334 port->write_urb->transfer_buffer,
335 count, &port->lock);
336 port->write_urb->transfer_buffer_length = count;
337 port->write_urb->dev = port->serial->dev;
338 result = usb_submit_urb(port->write_urb, GFP_NOIO);
339 if (result != 0) {
340 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
341 " with error %d\n", __func__, result);
342 priv->flags.write_urb_in_use = 0;
343 }
344
345 usb_serial_port_softint(port);
346 }
347
348 static int oti6858_startup(struct usb_serial *serial)
349 {
350 struct usb_serial_port *port = serial->port[0];
351 struct oti6858_private *priv;
352 int i;
353
354 for (i = 0; i < serial->num_ports; ++i) {
355 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);
356 if (!priv)
357 break;
358
359 spin_lock_init(&priv->lock);
360 init_waitqueue_head(&priv->intr_wait);
361 /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */
362 /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */
363 priv->port = port;
364 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
365 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
366
367 usb_set_serial_port_data(serial->port[i], priv);
368 }
369 if (i == serial->num_ports)
370 return 0;
371
372 for (--i; i >= 0; --i) {
373 priv = usb_get_serial_port_data(serial->port[i]);
374 kfree(priv);
375 usb_set_serial_port_data(serial->port[i], NULL);
376 }
377 return -ENOMEM;
378 }
379
380 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
381 const unsigned char *buf, int count)
382 {
383 dbg("%s(port = %d, count = %d)", __func__, port->number, count);
384
385 if (!count)
386 return count;
387
388 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
389
390 return count;
391 }
392
393 static int oti6858_write_room(struct tty_struct *tty)
394 {
395 struct usb_serial_port *port = tty->driver_data;
396 int room = 0;
397 unsigned long flags;
398
399 dbg("%s(port = %d)", __func__, port->number);
400
401 spin_lock_irqsave(&port->lock, flags);
402 room = kfifo_avail(&port->write_fifo);
403 spin_unlock_irqrestore(&port->lock, flags);
404
405 return room;
406 }
407
408 static int oti6858_chars_in_buffer(struct tty_struct *tty)
409 {
410 struct usb_serial_port *port = tty->driver_data;
411 int chars = 0;
412 unsigned long flags;
413
414 dbg("%s(port = %d)", __func__, port->number);
415
416 spin_lock_irqsave(&port->lock, flags);
417 chars = kfifo_len(&port->write_fifo);
418 spin_unlock_irqrestore(&port->lock, flags);
419
420 return chars;
421 }
422
423 static void oti6858_init_termios(struct tty_struct *tty)
424 {
425 *(tty->termios) = tty_std_termios;
426 tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
427 tty->termios->c_ispeed = 38400;
428 tty->termios->c_ospeed = 38400;
429 }
430
431 static void oti6858_set_termios(struct tty_struct *tty,
432 struct usb_serial_port *port, struct ktermios *old_termios)
433 {
434 struct oti6858_private *priv = usb_get_serial_port_data(port);
435 unsigned long flags;
436 unsigned int cflag;
437 u8 frame_fmt, control;
438 __le16 divisor;
439 int br;
440
441 dbg("%s(port = %d)", __func__, port->number);
442
443 if (!tty) {
444 dbg("%s(): no tty structures", __func__);
445 return;
446 }
447
448 cflag = tty->termios->c_cflag;
449
450 spin_lock_irqsave(&priv->lock, flags);
451 divisor = priv->pending_setup.divisor;
452 frame_fmt = priv->pending_setup.frame_fmt;
453 control = priv->pending_setup.control;
454 spin_unlock_irqrestore(&priv->lock, flags);
455
456 frame_fmt &= ~FMT_DATA_BITS_MASK;
457 switch (cflag & CSIZE) {
458 case CS5:
459 frame_fmt |= FMT_DATA_BITS_5;
460 break;
461 case CS6:
462 frame_fmt |= FMT_DATA_BITS_6;
463 break;
464 case CS7:
465 frame_fmt |= FMT_DATA_BITS_7;
466 break;
467 default:
468 case CS8:
469 frame_fmt |= FMT_DATA_BITS_8;
470 break;
471 }
472
473 /* manufacturer claims that this device can work with baud rates
474 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
475 * guarantee that any other baud rate will work (especially
476 * the higher ones)
477 */
478 br = tty_get_baud_rate(tty);
479 if (br == 0) {
480 divisor = 0;
481 } else {
482 int real_br;
483 int new_divisor;
484 br = min(br, OTI6858_MAX_BAUD_RATE);
485
486 new_divisor = (96000000 + 8 * br) / (16 * br);
487 real_br = 96000000 / (16 * new_divisor);
488 divisor = cpu_to_le16(new_divisor);
489 tty_encode_baud_rate(tty, real_br, real_br);
490 }
491
492 frame_fmt &= ~FMT_STOP_BITS_MASK;
493 if ((cflag & CSTOPB) != 0)
494 frame_fmt |= FMT_STOP_BITS_2;
495 else
496 frame_fmt |= FMT_STOP_BITS_1;
497
498 frame_fmt &= ~FMT_PARITY_MASK;
499 if ((cflag & PARENB) != 0) {
500 if ((cflag & PARODD) != 0)
501 frame_fmt |= FMT_PARITY_ODD;
502 else
503 frame_fmt |= FMT_PARITY_EVEN;
504 } else {
505 frame_fmt |= FMT_PARITY_NONE;
506 }
507
508 control &= ~CONTROL_MASK;
509 if ((cflag & CRTSCTS) != 0)
510 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
511
512 /* change control lines if we are switching to or from B0 */
513 /* FIXME:
514 spin_lock_irqsave(&priv->lock, flags);
515 control = priv->line_control;
516 if ((cflag & CBAUD) == B0)
517 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
518 else
519 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
520 if (control != priv->line_control) {
521 control = priv->line_control;
522 spin_unlock_irqrestore(&priv->lock, flags);
523 set_control_lines(serial->dev, control);
524 } else {
525 spin_unlock_irqrestore(&priv->lock, flags);
526 }
527 */
528
529 spin_lock_irqsave(&priv->lock, flags);
530 if (divisor != priv->pending_setup.divisor
531 || control != priv->pending_setup.control
532 || frame_fmt != priv->pending_setup.frame_fmt) {
533 priv->pending_setup.divisor = divisor;
534 priv->pending_setup.control = control;
535 priv->pending_setup.frame_fmt = frame_fmt;
536 }
537 spin_unlock_irqrestore(&priv->lock, flags);
538 }
539
540 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
541 {
542 struct oti6858_private *priv = usb_get_serial_port_data(port);
543 struct ktermios tmp_termios;
544 struct usb_serial *serial = port->serial;
545 struct oti6858_control_pkt *buf;
546 unsigned long flags;
547 int result;
548
549 dbg("%s(port = %d)", __func__, port->number);
550
551 usb_clear_halt(serial->dev, port->write_urb->pipe);
552 usb_clear_halt(serial->dev, port->read_urb->pipe);
553
554 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
555 if (buf == NULL) {
556 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
557 return -ENOMEM;
558 }
559
560 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
561 OTI6858_REQ_T_GET_STATUS,
562 OTI6858_REQ_GET_STATUS,
563 0, 0,
564 buf, OTI6858_CTRL_PKT_SIZE,
565 100);
566 if (result != OTI6858_CTRL_PKT_SIZE) {
567 /* assume default (after power-on reset) values */
568 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
569 buf->frame_fmt = 0x03; /* 8N1 */
570 buf->something = 0x43;
571 buf->control = 0x4c; /* DTR, RTS */
572 buf->tx_status = 0x00;
573 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
574 buf->rx_bytes_avail = 0x00;
575 }
576
577 spin_lock_irqsave(&priv->lock, flags);
578 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
579 priv->pending_setup.divisor = buf->divisor;
580 priv->pending_setup.frame_fmt = buf->frame_fmt;
581 priv->pending_setup.control = buf->control;
582 spin_unlock_irqrestore(&priv->lock, flags);
583 kfree(buf);
584
585 dbg("%s(): submitting interrupt urb", __func__);
586 port->interrupt_in_urb->dev = serial->dev;
587 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
588 if (result != 0) {
589 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
590 " with error %d\n", __func__, result);
591 oti6858_close(port);
592 return -EPROTO;
593 }
594
595 /* setup termios */
596 if (tty)
597 oti6858_set_termios(tty, port, &tmp_termios);
598 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
599 return 0;
600 }
601
602 static void oti6858_close(struct usb_serial_port *port)
603 {
604 struct oti6858_private *priv = usb_get_serial_port_data(port);
605 unsigned long flags;
606
607 dbg("%s(port = %d)", __func__, port->number);
608
609 spin_lock_irqsave(&port->lock, flags);
610 /* clear out any remaining data in the buffer */
611 kfifo_reset_out(&port->write_fifo);
612 spin_unlock_irqrestore(&port->lock, flags);
613
614 dbg("%s(): after buf_clear()", __func__);
615
616 /* cancel scheduled setup */
617 cancel_delayed_work_sync(&priv->delayed_setup_work);
618 cancel_delayed_work_sync(&priv->delayed_write_work);
619
620 /* shutdown our urbs */
621 dbg("%s(): shutting down urbs", __func__);
622 usb_kill_urb(port->write_urb);
623 usb_kill_urb(port->read_urb);
624 usb_kill_urb(port->interrupt_in_urb);
625 }
626
627 static int oti6858_tiocmset(struct tty_struct *tty,
628 unsigned int set, unsigned int clear)
629 {
630 struct usb_serial_port *port = tty->driver_data;
631 struct oti6858_private *priv = usb_get_serial_port_data(port);
632 unsigned long flags;
633 u8 control;
634
635 dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)",
636 __func__, port->number, set, clear);
637
638 if (!usb_get_intfdata(port->serial->interface))
639 return -ENODEV;
640
641 /* FIXME: check if this is correct (active high/low) */
642 spin_lock_irqsave(&priv->lock, flags);
643 control = priv->pending_setup.control;
644 if ((set & TIOCM_RTS) != 0)
645 control |= CONTROL_RTS_HIGH;
646 if ((set & TIOCM_DTR) != 0)
647 control |= CONTROL_DTR_HIGH;
648 if ((clear & TIOCM_RTS) != 0)
649 control &= ~CONTROL_RTS_HIGH;
650 if ((clear & TIOCM_DTR) != 0)
651 control &= ~CONTROL_DTR_HIGH;
652
653 if (control != priv->pending_setup.control)
654 priv->pending_setup.control = control;
655
656 spin_unlock_irqrestore(&priv->lock, flags);
657 return 0;
658 }
659
660 static int oti6858_tiocmget(struct tty_struct *tty)
661 {
662 struct usb_serial_port *port = tty->driver_data;
663 struct oti6858_private *priv = usb_get_serial_port_data(port);
664 unsigned long flags;
665 unsigned pin_state;
666 unsigned result = 0;
667
668 dbg("%s(port = %d)", __func__, port->number);
669
670 if (!usb_get_intfdata(port->serial->interface))
671 return -ENODEV;
672
673 spin_lock_irqsave(&priv->lock, flags);
674 pin_state = priv->status.pin_state & PIN_MASK;
675 spin_unlock_irqrestore(&priv->lock, flags);
676
677 /* FIXME: check if this is correct (active high/low) */
678 if ((pin_state & PIN_RTS) != 0)
679 result |= TIOCM_RTS;
680 if ((pin_state & PIN_CTS) != 0)
681 result |= TIOCM_CTS;
682 if ((pin_state & PIN_DSR) != 0)
683 result |= TIOCM_DSR;
684 if ((pin_state & PIN_DTR) != 0)
685 result |= TIOCM_DTR;
686 if ((pin_state & PIN_RI) != 0)
687 result |= TIOCM_RI;
688 if ((pin_state & PIN_DCD) != 0)
689 result |= TIOCM_CD;
690
691 dbg("%s() = 0x%08x", __func__, result);
692
693 return result;
694 }
695
696 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
697 {
698 struct oti6858_private *priv = usb_get_serial_port_data(port);
699 unsigned long flags;
700 unsigned int prev, status;
701 unsigned int changed;
702
703 spin_lock_irqsave(&priv->lock, flags);
704 prev = priv->status.pin_state;
705 spin_unlock_irqrestore(&priv->lock, flags);
706
707 while (1) {
708 wait_event_interruptible(priv->intr_wait,
709 priv->status.pin_state != prev);
710 if (signal_pending(current))
711 return -ERESTARTSYS;
712
713 spin_lock_irqsave(&priv->lock, flags);
714 status = priv->status.pin_state & PIN_MASK;
715 spin_unlock_irqrestore(&priv->lock, flags);
716
717 changed = prev ^ status;
718 /* FIXME: check if this is correct (active high/low) */
719 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
720 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
721 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
722 ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
723 return 0;
724 prev = status;
725 }
726
727 /* NOTREACHED */
728 return 0;
729 }
730
731 static int oti6858_ioctl(struct tty_struct *tty,
732 unsigned int cmd, unsigned long arg)
733 {
734 struct usb_serial_port *port = tty->driver_data;
735
736 dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)",
737 __func__, port->number, cmd, arg);
738
739 switch (cmd) {
740 case TIOCMIWAIT:
741 dbg("%s(): TIOCMIWAIT", __func__);
742 return wait_modem_info(port, arg);
743 default:
744 dbg("%s(): 0x%04x not supported", __func__, cmd);
745 break;
746 }
747 return -ENOIOCTLCMD;
748 }
749
750
751 static void oti6858_release(struct usb_serial *serial)
752 {
753 int i;
754
755 dbg("%s()", __func__);
756
757 for (i = 0; i < serial->num_ports; ++i)
758 kfree(usb_get_serial_port_data(serial->port[i]));
759 }
760
761 static void oti6858_read_int_callback(struct urb *urb)
762 {
763 struct usb_serial_port *port = urb->context;
764 struct oti6858_private *priv = usb_get_serial_port_data(port);
765 int transient = 0, can_recv = 0, resubmit = 1;
766 int status = urb->status;
767
768 dbg("%s(port = %d, status = %d)",
769 __func__, port->number, status);
770
771 switch (status) {
772 case 0:
773 /* success */
774 break;
775 case -ECONNRESET:
776 case -ENOENT:
777 case -ESHUTDOWN:
778 /* this urb is terminated, clean up */
779 dbg("%s(): urb shutting down with status: %d",
780 __func__, status);
781 return;
782 default:
783 dbg("%s(): nonzero urb status received: %d",
784 __func__, status);
785 break;
786 }
787
788 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
789 struct oti6858_control_pkt *xs = urb->transfer_buffer;
790 unsigned long flags;
791
792 spin_lock_irqsave(&priv->lock, flags);
793
794 if (!priv->transient) {
795 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
796 if (xs->rx_bytes_avail == 0) {
797 priv->transient = 4;
798 priv->setup_done = 0;
799 resubmit = 0;
800 dbg("%s(): scheduling setup_line()",
801 __func__);
802 schedule_delayed_work(&priv->delayed_setup_work, 0);
803 }
804 }
805 } else {
806 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
807 priv->transient = 0;
808 } else if (!priv->setup_done) {
809 resubmit = 0;
810 } else if (--priv->transient == 0) {
811 if (xs->rx_bytes_avail == 0) {
812 priv->transient = 4;
813 priv->setup_done = 0;
814 resubmit = 0;
815 dbg("%s(): scheduling setup_line()",
816 __func__);
817 schedule_delayed_work(&priv->delayed_setup_work, 0);
818 }
819 }
820 }
821
822 if (!priv->transient) {
823 if (xs->pin_state != priv->status.pin_state)
824 wake_up_interruptible(&priv->intr_wait);
825 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
826 }
827
828 if (!priv->transient && xs->rx_bytes_avail != 0) {
829 can_recv = xs->rx_bytes_avail;
830 priv->flags.read_urb_in_use = 1;
831 }
832
833 transient = priv->transient;
834 spin_unlock_irqrestore(&priv->lock, flags);
835 }
836
837 if (can_recv) {
838 int result;
839
840 port->read_urb->dev = port->serial->dev;
841 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
842 if (result != 0) {
843 priv->flags.read_urb_in_use = 0;
844 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
845 " error %d\n", __func__, result);
846 } else {
847 resubmit = 0;
848 }
849 } else if (!transient) {
850 unsigned long flags;
851 int count;
852
853 spin_lock_irqsave(&port->lock, flags);
854 count = kfifo_len(&port->write_fifo);
855 spin_unlock_irqrestore(&port->lock, flags);
856
857 spin_lock_irqsave(&priv->lock, flags);
858 if (priv->flags.write_urb_in_use == 0 && count != 0) {
859 schedule_delayed_work(&priv->delayed_write_work, 0);
860 resubmit = 0;
861 }
862 spin_unlock_irqrestore(&priv->lock, flags);
863 }
864
865 if (resubmit) {
866 int result;
867
868 /* dbg("%s(): submitting interrupt urb", __func__); */
869 urb->dev = port->serial->dev;
870 result = usb_submit_urb(urb, GFP_ATOMIC);
871 if (result != 0) {
872 dev_err(&urb->dev->dev,
873 "%s(): usb_submit_urb() failed with"
874 " error %d\n", __func__, result);
875 }
876 }
877 }
878
879 static void oti6858_read_bulk_callback(struct urb *urb)
880 {
881 struct usb_serial_port *port = urb->context;
882 struct oti6858_private *priv = usb_get_serial_port_data(port);
883 struct tty_struct *tty;
884 unsigned char *data = urb->transfer_buffer;
885 unsigned long flags;
886 int status = urb->status;
887 int result;
888
889 dbg("%s(port = %d, status = %d)",
890 __func__, port->number, status);
891
892 spin_lock_irqsave(&priv->lock, flags);
893 priv->flags.read_urb_in_use = 0;
894 spin_unlock_irqrestore(&priv->lock, flags);
895
896 if (status != 0) {
897 /*
898 if (status == -EPROTO) {
899 * PL2303 mysteriously fails with -EPROTO reschedule
900 the read *
901 dbg("%s - caught -EPROTO, resubmitting the urb",
902 __func__);
903 result = usb_submit_urb(urb, GFP_ATOMIC);
904 if (result)
905 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);
906 return;
907 }
908 */
909 dbg("%s(): unable to handle the error, exiting", __func__);
910 return;
911 }
912
913 tty = tty_port_tty_get(&port->port);
914 if (tty != NULL && urb->actual_length > 0) {
915 tty_insert_flip_string(tty, data, urb->actual_length);
916 tty_flip_buffer_push(tty);
917 }
918 tty_kref_put(tty);
919
920 /* schedule the interrupt urb */
921 port->interrupt_in_urb->dev = port->serial->dev;
922 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
923 if (result != 0 && result != -EPERM) {
924 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
925 " error %d\n", __func__, result);
926 }
927 }
928
929 static void oti6858_write_bulk_callback(struct urb *urb)
930 {
931 struct usb_serial_port *port = urb->context;
932 struct oti6858_private *priv = usb_get_serial_port_data(port);
933 int status = urb->status;
934 int result;
935
936 dbg("%s(port = %d, status = %d)",
937 __func__, port->number, status);
938
939 switch (status) {
940 case 0:
941 /* success */
942 break;
943 case -ECONNRESET:
944 case -ENOENT:
945 case -ESHUTDOWN:
946 /* this urb is terminated, clean up */
947 dbg("%s(): urb shutting down with status: %d",
948 __func__, status);
949 priv->flags.write_urb_in_use = 0;
950 return;
951 default:
952 /* error in the urb, so we have to resubmit it */
953 dbg("%s(): nonzero write bulk status received: %d",
954 __func__, status);
955 dbg("%s(): overflow in write", __func__);
956
957 port->write_urb->transfer_buffer_length = 1;
958 port->write_urb->dev = port->serial->dev;
959 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
960 if (result) {
961 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
962 " error %d\n", __func__, result);
963 } else {
964 return;
965 }
966 }
967
968 priv->flags.write_urb_in_use = 0;
969
970 /* schedule the interrupt urb if we are still open */
971 port->interrupt_in_urb->dev = port->serial->dev;
972 dbg("%s(): submitting interrupt urb", __func__);
973 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
974 if (result != 0) {
975 dev_err(&port->dev, "%s(): failed submitting int urb,"
976 " error %d\n", __func__, result);
977 }
978 }
979
980 /* module description and (de)initialization */
981
982 static int __init oti6858_init(void)
983 {
984 int retval;
985
986 retval = usb_serial_register(&oti6858_device);
987 if (retval == 0) {
988 retval = usb_register(&oti6858_driver);
989 if (retval)
990 usb_serial_deregister(&oti6858_device);
991 }
992 return retval;
993 }
994
995 static void __exit oti6858_exit(void)
996 {
997 usb_deregister(&oti6858_driver);
998 usb_serial_deregister(&oti6858_device);
999 }
1000
1001 module_init(oti6858_init);
1002 module_exit(oti6858_exit);
1003
1004 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
1005 MODULE_AUTHOR(OTI6858_AUTHOR);
1006 MODULE_VERSION(OTI6858_VERSION);
1007 MODULE_LICENSE("GPL");
1008
1009 module_param(debug, bool, S_IRUGO | S_IWUSR);
1010 MODULE_PARM_DESC(debug, "enable debug output");
1011