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sparc64: Update defconfig.
[linux-2.6/libata-dev.git] / drivers / usb / serial / oti6858.c
blobe199b0f4f99c462f0badb595fa9290be85214868
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, struct file *file,
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, struct file *file);
148 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
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 .num_ports = 1,
161 .open = oti6858_open,
162 .close = oti6858_close,
163 .write = oti6858_write,
164 .ioctl = oti6858_ioctl,
165 .set_termios = oti6858_set_termios,
166 .init_termios = oti6858_init_termios,
167 .tiocmget = oti6858_tiocmget,
168 .tiocmset = oti6858_tiocmset,
169 .read_bulk_callback = oti6858_read_bulk_callback,
170 .read_int_callback = oti6858_read_int_callback,
171 .write_bulk_callback = oti6858_write_bulk_callback,
172 .write_room = oti6858_write_room,
173 .chars_in_buffer = oti6858_chars_in_buffer,
174 .attach = oti6858_startup,
175 .release = oti6858_release,
176 };
177
178 struct oti6858_private {
179 spinlock_t lock;
180
181 struct oti6858_control_pkt status;
182
183 struct {
184 u8 read_urb_in_use;
185 u8 write_urb_in_use;
186 } flags;
187 struct delayed_work delayed_write_work;
188
189 struct {
190 __le16 divisor;
191 u8 frame_fmt;
192 u8 control;
193 } pending_setup;
194 u8 transient;
195 u8 setup_done;
196 struct delayed_work delayed_setup_work;
197
198 wait_queue_head_t intr_wait;
199 struct usb_serial_port *port; /* USB port with which associated */
200 };
201
202 static void setup_line(struct work_struct *work)
203 {
204 struct oti6858_private *priv = container_of(work,
205 struct oti6858_private, delayed_setup_work.work);
206 struct usb_serial_port *port = priv->port;
207 struct oti6858_control_pkt *new_setup;
208 unsigned long flags;
209 int result;
210
211 dbg("%s(port = %d)", __func__, port->number);
212
213 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
214 if (new_setup == NULL) {
215 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
216 /* we will try again */
217 schedule_delayed_work(&priv->delayed_setup_work,
218 msecs_to_jiffies(2));
219 return;
220 }
221
222 result = usb_control_msg(port->serial->dev,
223 usb_rcvctrlpipe(port->serial->dev, 0),
224 OTI6858_REQ_T_GET_STATUS,
225 OTI6858_REQ_GET_STATUS,
226 0, 0,
227 new_setup, OTI6858_CTRL_PKT_SIZE,
228 100);
229
230 if (result != OTI6858_CTRL_PKT_SIZE) {
231 dev_err(&port->dev, "%s(): error reading status\n", __func__);
232 kfree(new_setup);
233 /* we will try again */
234 schedule_delayed_work(&priv->delayed_setup_work,
235 msecs_to_jiffies(2));
236 return;
237 }
238
239 spin_lock_irqsave(&priv->lock, flags);
240 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
241 new_setup->divisor = priv->pending_setup.divisor;
242 new_setup->control = priv->pending_setup.control;
243 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
244
245 spin_unlock_irqrestore(&priv->lock, flags);
246 result = usb_control_msg(port->serial->dev,
247 usb_sndctrlpipe(port->serial->dev, 0),
248 OTI6858_REQ_T_SET_LINE,
249 OTI6858_REQ_SET_LINE,
250 0, 0,
251 new_setup, OTI6858_CTRL_PKT_SIZE,
252 100);
253 } else {
254 spin_unlock_irqrestore(&priv->lock, flags);
255 result = 0;
256 }
257 kfree(new_setup);
258
259 spin_lock_irqsave(&priv->lock, flags);
260 if (result != OTI6858_CTRL_PKT_SIZE)
261 priv->transient = 0;
262 priv->setup_done = 1;
263 spin_unlock_irqrestore(&priv->lock, flags);
264
265 dbg("%s(): submitting interrupt urb", __func__);
266 port->interrupt_in_urb->dev = port->serial->dev;
267 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
268 if (result != 0) {
269 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
270 " with error %d\n", __func__, result);
271 }
272 }
273
274 static void send_data(struct work_struct *work)
275 {
276 struct oti6858_private *priv = container_of(work,
277 struct oti6858_private, delayed_write_work.work);
278 struct usb_serial_port *port = priv->port;
279 int count = 0, result;
280 unsigned long flags;
281 u8 *allow;
282
283 dbg("%s(port = %d)", __func__, port->number);
284
285 spin_lock_irqsave(&priv->lock, flags);
286 if (priv->flags.write_urb_in_use) {
287 spin_unlock_irqrestore(&priv->lock, flags);
288 schedule_delayed_work(&priv->delayed_write_work,
289 msecs_to_jiffies(2));
290 return;
291 }
292 priv->flags.write_urb_in_use = 1;
293 spin_unlock_irqrestore(&priv->lock, flags);
294
295 spin_lock_irqsave(&port->lock, flags);
296 count = kfifo_len(&port->write_fifo);
297 spin_unlock_irqrestore(&port->lock, flags);
298
299 if (count > port->bulk_out_size)
300 count = port->bulk_out_size;
301
302 if (count != 0) {
303 allow = kmalloc(1, GFP_KERNEL);
304 if (!allow) {
305 dev_err(&port->dev, "%s(): kmalloc failed\n",
306 __func__);
307 return;
308 }
309 result = usb_control_msg(port->serial->dev,
310 usb_rcvctrlpipe(port->serial->dev, 0),
311 OTI6858_REQ_T_CHECK_TXBUFF,
312 OTI6858_REQ_CHECK_TXBUFF,
313 count, 0, allow, 1, 100);
314 if (result != 1 || *allow != 0)
315 count = 0;
316 kfree(allow);
317 }
318
319 if (count == 0) {
320 priv->flags.write_urb_in_use = 0;
321
322 dbg("%s(): submitting interrupt urb", __func__);
323 port->interrupt_in_urb->dev = port->serial->dev;
324 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
325 if (result != 0) {
326 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
327 " with error %d\n", __func__, result);
328 }
329 return;
330 }
331
332 count = kfifo_out_locked(&port->write_fifo,
333 port->write_urb->transfer_buffer,
334 count, &port->lock);
335 port->write_urb->transfer_buffer_length = count;
336 port->write_urb->dev = port->serial->dev;
337 result = usb_submit_urb(port->write_urb, GFP_NOIO);
338 if (result != 0) {
339 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
340 " with error %d\n", __func__, result);
341 priv->flags.write_urb_in_use = 0;
342 }
343
344 usb_serial_port_softint(port);
345 }
346
347 static int oti6858_startup(struct usb_serial *serial)
348 {
349 struct usb_serial_port *port = serial->port[0];
350 struct oti6858_private *priv;
351 int i;
352
353 for (i = 0; i < serial->num_ports; ++i) {
354 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);
355 if (!priv)
356 break;
357
358 spin_lock_init(&priv->lock);
359 init_waitqueue_head(&priv->intr_wait);
360 /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */
361 /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */
362 priv->port = port;
363 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
364 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
365
366 usb_set_serial_port_data(serial->port[i], priv);
367 }
368 if (i == serial->num_ports)
369 return 0;
370
371 for (--i; i >= 0; --i) {
372 priv = usb_get_serial_port_data(serial->port[i]);
373 kfree(priv);
374 usb_set_serial_port_data(serial->port[i], NULL);
375 }
376 return -ENOMEM;
377 }
378
379 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
380 const unsigned char *buf, int count)
381 {
382 dbg("%s(port = %d, count = %d)", __func__, port->number, count);
383
384 if (!count)
385 return count;
386
387 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
388
389 return count;
390 }
391
392 static int oti6858_write_room(struct tty_struct *tty)
393 {
394 struct usb_serial_port *port = tty->driver_data;
395 int room = 0;
396 unsigned long flags;
397
398 dbg("%s(port = %d)", __func__, port->number);
399
400 spin_lock_irqsave(&port->lock, flags);
401 room = kfifo_avail(&port->write_fifo);
402 spin_unlock_irqrestore(&port->lock, flags);
403
404 return room;
405 }
406
407 static int oti6858_chars_in_buffer(struct tty_struct *tty)
408 {
409 struct usb_serial_port *port = tty->driver_data;
410 int chars = 0;
411 unsigned long flags;
412
413 dbg("%s(port = %d)", __func__, port->number);
414
415 spin_lock_irqsave(&port->lock, flags);
416 chars = kfifo_len(&port->write_fifo);
417 spin_unlock_irqrestore(&port->lock, flags);
418
419 return chars;
420 }
421
422 static void oti6858_init_termios(struct tty_struct *tty)
423 {
424 *(tty->termios) = tty_std_termios;
425 tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
426 tty->termios->c_ispeed = 38400;
427 tty->termios->c_ospeed = 38400;
428 }
429
430 static void oti6858_set_termios(struct tty_struct *tty,
431 struct usb_serial_port *port, struct ktermios *old_termios)
432 {
433 struct oti6858_private *priv = usb_get_serial_port_data(port);
434 unsigned long flags;
435 unsigned int cflag;
436 u8 frame_fmt, control;
437 __le16 divisor;
438 int br;
439
440 dbg("%s(port = %d)", __func__, port->number);
441
442 if (!tty) {
443 dbg("%s(): no tty structures", __func__);
444 return;
445 }
446
447 cflag = tty->termios->c_cflag;
448
449 spin_lock_irqsave(&priv->lock, flags);
450 divisor = priv->pending_setup.divisor;
451 frame_fmt = priv->pending_setup.frame_fmt;
452 control = priv->pending_setup.control;
453 spin_unlock_irqrestore(&priv->lock, flags);
454
455 frame_fmt &= ~FMT_DATA_BITS_MASK;
456 switch (cflag & CSIZE) {
457 case CS5:
458 frame_fmt |= FMT_DATA_BITS_5;
459 break;
460 case CS6:
461 frame_fmt |= FMT_DATA_BITS_6;
462 break;
463 case CS7:
464 frame_fmt |= FMT_DATA_BITS_7;
465 break;
466 default:
467 case CS8:
468 frame_fmt |= FMT_DATA_BITS_8;
469 break;
470 }
471
472 /* manufacturer claims that this device can work with baud rates
473 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
474 * guarantee that any other baud rate will work (especially
475 * the higher ones)
476 */
477 br = tty_get_baud_rate(tty);
478 if (br == 0) {
479 divisor = 0;
480 } else {
481 int real_br;
482 int new_divisor;
483 br = min(br, OTI6858_MAX_BAUD_RATE);
484
485 new_divisor = (96000000 + 8 * br) / (16 * br);
486 real_br = 96000000 / (16 * new_divisor);
487 divisor = cpu_to_le16(new_divisor);
488 tty_encode_baud_rate(tty, real_br, real_br);
489 }
490
491 frame_fmt &= ~FMT_STOP_BITS_MASK;
492 if ((cflag & CSTOPB) != 0)
493 frame_fmt |= FMT_STOP_BITS_2;
494 else
495 frame_fmt |= FMT_STOP_BITS_1;
496
497 frame_fmt &= ~FMT_PARITY_MASK;
498 if ((cflag & PARENB) != 0) {
499 if ((cflag & PARODD) != 0)
500 frame_fmt |= FMT_PARITY_ODD;
501 else
502 frame_fmt |= FMT_PARITY_EVEN;
503 } else {
504 frame_fmt |= FMT_PARITY_NONE;
505 }
506
507 control &= ~CONTROL_MASK;
508 if ((cflag & CRTSCTS) != 0)
509 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
510
511 /* change control lines if we are switching to or from B0 */
512 /* FIXME:
513 spin_lock_irqsave(&priv->lock, flags);
514 control = priv->line_control;
515 if ((cflag & CBAUD) == B0)
516 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
517 else
518 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
519 if (control != priv->line_control) {
520 control = priv->line_control;
521 spin_unlock_irqrestore(&priv->lock, flags);
522 set_control_lines(serial->dev, control);
523 } else {
524 spin_unlock_irqrestore(&priv->lock, flags);
525 }
526 */
527
528 spin_lock_irqsave(&priv->lock, flags);
529 if (divisor != priv->pending_setup.divisor
530 || control != priv->pending_setup.control
531 || frame_fmt != priv->pending_setup.frame_fmt) {
532 priv->pending_setup.divisor = divisor;
533 priv->pending_setup.control = control;
534 priv->pending_setup.frame_fmt = frame_fmt;
535 }
536 spin_unlock_irqrestore(&priv->lock, flags);
537 }
538
539 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
540 {
541 struct oti6858_private *priv = usb_get_serial_port_data(port);
542 struct ktermios tmp_termios;
543 struct usb_serial *serial = port->serial;
544 struct oti6858_control_pkt *buf;
545 unsigned long flags;
546 int result;
547
548 dbg("%s(port = %d)", __func__, port->number);
549
550 usb_clear_halt(serial->dev, port->write_urb->pipe);
551 usb_clear_halt(serial->dev, port->read_urb->pipe);
552
553 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
554 if (buf == NULL) {
555 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
556 return -ENOMEM;
557 }
558
559 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
560 OTI6858_REQ_T_GET_STATUS,
561 OTI6858_REQ_GET_STATUS,
562 0, 0,
563 buf, OTI6858_CTRL_PKT_SIZE,
564 100);
565 if (result != OTI6858_CTRL_PKT_SIZE) {
566 /* assume default (after power-on reset) values */
567 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
568 buf->frame_fmt = 0x03; /* 8N1 */
569 buf->something = 0x43;
570 buf->control = 0x4c; /* DTR, RTS */
571 buf->tx_status = 0x00;
572 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
573 buf->rx_bytes_avail = 0x00;
574 }
575
576 spin_lock_irqsave(&priv->lock, flags);
577 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
578 priv->pending_setup.divisor = buf->divisor;
579 priv->pending_setup.frame_fmt = buf->frame_fmt;
580 priv->pending_setup.control = buf->control;
581 spin_unlock_irqrestore(&priv->lock, flags);
582 kfree(buf);
583
584 dbg("%s(): submitting interrupt urb", __func__);
585 port->interrupt_in_urb->dev = serial->dev;
586 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
587 if (result != 0) {
588 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
589 " with error %d\n", __func__, result);
590 oti6858_close(port);
591 return -EPROTO;
592 }
593
594 /* setup termios */
595 if (tty)
596 oti6858_set_termios(tty, port, &tmp_termios);
597 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
598 return 0;
599 }
600
601 static void oti6858_close(struct usb_serial_port *port)
602 {
603 struct oti6858_private *priv = usb_get_serial_port_data(port);
604 unsigned long flags;
605
606 dbg("%s(port = %d)", __func__, port->number);
607
608 spin_lock_irqsave(&port->lock, flags);
609 /* clear out any remaining data in the buffer */
610 kfifo_reset_out(&port->write_fifo);
611 spin_unlock_irqrestore(&port->lock, flags);
612
613 dbg("%s(): after buf_clear()", __func__);
614
615 /* cancel scheduled setup */
616 cancel_delayed_work(&priv->delayed_setup_work);
617 cancel_delayed_work(&priv->delayed_write_work);
618 flush_scheduled_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, struct file *file,
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, struct file *file)
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, struct file *file,
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
Linux 2.6 libata-dev (mirror)