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tty: USB does not need the filp argument in the drivers
[deliverable/linux.git] / drivers / usb / serial / oti6858.c
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 "oti6858.h"
55
56 #define OTI6858_DESCRIPTION \
57 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
58 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
59 #define OTI6858_VERSION "0.1"
60
61 static struct usb_device_id id_table [] = {
62 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
63 { }
64 };
65
66 MODULE_DEVICE_TABLE(usb, id_table);
67
68 static struct usb_driver oti6858_driver = {
69 .name = "oti6858",
70 .probe = usb_serial_probe,
71 .disconnect = usb_serial_disconnect,
72 .id_table = id_table,
73 .no_dynamic_id = 1,
74 };
75
76 static int debug;
77
78
79 /* buffering code, copied from pl2303 driver */
80 #define PL2303_BUF_SIZE 1024
81 #define PL2303_TMP_BUF_SIZE 1024
82
83 struct oti6858_buf {
84 unsigned int buf_size;
85 char *buf_buf;
86 char *buf_get;
87 char *buf_put;
88 };
89
90 /* requests */
91 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
92 #define OTI6858_REQ_T_GET_STATUS 0x01
93
94 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
95 #define OTI6858_REQ_T_SET_LINE 0x00
96
97 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
98 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
99
100 /* format of the control packet */
101 struct oti6858_control_pkt {
102 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
103 #define OTI6858_MAX_BAUD_RATE 3000000
104 u8 frame_fmt;
105 #define FMT_STOP_BITS_MASK 0xc0
106 #define FMT_STOP_BITS_1 0x00
107 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
108 #define FMT_PARITY_MASK 0x38
109 #define FMT_PARITY_NONE 0x00
110 #define FMT_PARITY_ODD 0x08
111 #define FMT_PARITY_EVEN 0x18
112 #define FMT_PARITY_MARK 0x28
113 #define FMT_PARITY_SPACE 0x38
114 #define FMT_DATA_BITS_MASK 0x03
115 #define FMT_DATA_BITS_5 0x00
116 #define FMT_DATA_BITS_6 0x01
117 #define FMT_DATA_BITS_7 0x02
118 #define FMT_DATA_BITS_8 0x03
119 u8 something; /* always equals 0x43 */
120 u8 control; /* settings of flow control lines */
121 #define CONTROL_MASK 0x0c
122 #define CONTROL_DTR_HIGH 0x08
123 #define CONTROL_RTS_HIGH 0x04
124 u8 tx_status;
125 #define TX_BUFFER_EMPTIED 0x09
126 u8 pin_state;
127 #define PIN_MASK 0x3f
128 #define PIN_RTS 0x20 /* output pin */
129 #define PIN_CTS 0x10 /* input pin, active low */
130 #define PIN_DSR 0x08 /* input pin, active low */
131 #define PIN_DTR 0x04 /* output pin */
132 #define PIN_RI 0x02 /* input pin, active low */
133 #define PIN_DCD 0x01 /* input pin, active low */
134 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
135 };
136
137 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
138 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
139 (((a)->divisor == (priv)->pending_setup.divisor) \
140 && ((a)->control == (priv)->pending_setup.control) \
141 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
142
143 /* function prototypes */
144 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
145 static void oti6858_close(struct usb_serial_port *port);
146 static void oti6858_set_termios(struct tty_struct *tty,
147 struct usb_serial_port *port, struct ktermios *old);
148 static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
149 unsigned int cmd, unsigned long arg);
150 static void oti6858_read_int_callback(struct urb *urb);
151 static void oti6858_read_bulk_callback(struct urb *urb);
152 static void oti6858_write_bulk_callback(struct urb *urb);
153 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
154 const unsigned char *buf, int count);
155 static int oti6858_write_room(struct tty_struct *tty);
156 static int oti6858_chars_in_buffer(struct tty_struct *tty);
157 static int oti6858_tiocmget(struct tty_struct *tty, struct file *file);
158 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
159 unsigned int set, unsigned int clear);
160 static int oti6858_startup(struct usb_serial *serial);
161 static void oti6858_release(struct usb_serial *serial);
162
163 /* functions operating on buffers */
164 static struct oti6858_buf *oti6858_buf_alloc(unsigned int size);
165 static void oti6858_buf_free(struct oti6858_buf *pb);
166 static void oti6858_buf_clear(struct oti6858_buf *pb);
167 static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb);
168 static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb);
169 static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf,
170 unsigned int count);
171 static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf,
172 unsigned int count);
173
174
175 /* device info */
176 static struct usb_serial_driver oti6858_device = {
177 .driver = {
178 .owner = THIS_MODULE,
179 .name = "oti6858",
180 },
181 .id_table = id_table,
182 .num_ports = 1,
183 .open = oti6858_open,
184 .close = oti6858_close,
185 .write = oti6858_write,
186 .ioctl = oti6858_ioctl,
187 .set_termios = oti6858_set_termios,
188 .tiocmget = oti6858_tiocmget,
189 .tiocmset = oti6858_tiocmset,
190 .read_bulk_callback = oti6858_read_bulk_callback,
191 .read_int_callback = oti6858_read_int_callback,
192 .write_bulk_callback = oti6858_write_bulk_callback,
193 .write_room = oti6858_write_room,
194 .chars_in_buffer = oti6858_chars_in_buffer,
195 .attach = oti6858_startup,
196 .release = oti6858_release,
197 };
198
199 struct oti6858_private {
200 spinlock_t lock;
201
202 struct oti6858_buf *buf;
203 struct oti6858_control_pkt status;
204
205 struct {
206 u8 read_urb_in_use;
207 u8 write_urb_in_use;
208 u8 termios_initialized;
209 } flags;
210 struct delayed_work delayed_write_work;
211
212 struct {
213 __le16 divisor;
214 u8 frame_fmt;
215 u8 control;
216 } pending_setup;
217 u8 transient;
218 u8 setup_done;
219 struct delayed_work delayed_setup_work;
220
221 wait_queue_head_t intr_wait;
222 struct usb_serial_port *port; /* USB port with which associated */
223 };
224
225 static void setup_line(struct work_struct *work)
226 {
227 struct oti6858_private *priv = container_of(work,
228 struct oti6858_private, delayed_setup_work.work);
229 struct usb_serial_port *port = priv->port;
230 struct oti6858_control_pkt *new_setup;
231 unsigned long flags;
232 int result;
233
234 dbg("%s(port = %d)", __func__, port->number);
235
236 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
237 if (new_setup == NULL) {
238 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
239 /* we will try again */
240 schedule_delayed_work(&priv->delayed_setup_work,
241 msecs_to_jiffies(2));
242 return;
243 }
244
245 result = usb_control_msg(port->serial->dev,
246 usb_rcvctrlpipe(port->serial->dev, 0),
247 OTI6858_REQ_T_GET_STATUS,
248 OTI6858_REQ_GET_STATUS,
249 0, 0,
250 new_setup, OTI6858_CTRL_PKT_SIZE,
251 100);
252
253 if (result != OTI6858_CTRL_PKT_SIZE) {
254 dev_err(&port->dev, "%s(): error reading status\n", __func__);
255 kfree(new_setup);
256 /* we will try again */
257 schedule_delayed_work(&priv->delayed_setup_work,
258 msecs_to_jiffies(2));
259 return;
260 }
261
262 spin_lock_irqsave(&priv->lock, flags);
263 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
264 new_setup->divisor = priv->pending_setup.divisor;
265 new_setup->control = priv->pending_setup.control;
266 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
267
268 spin_unlock_irqrestore(&priv->lock, flags);
269 result = usb_control_msg(port->serial->dev,
270 usb_sndctrlpipe(port->serial->dev, 0),
271 OTI6858_REQ_T_SET_LINE,
272 OTI6858_REQ_SET_LINE,
273 0, 0,
274 new_setup, OTI6858_CTRL_PKT_SIZE,
275 100);
276 } else {
277 spin_unlock_irqrestore(&priv->lock, flags);
278 result = 0;
279 }
280 kfree(new_setup);
281
282 spin_lock_irqsave(&priv->lock, flags);
283 if (result != OTI6858_CTRL_PKT_SIZE)
284 priv->transient = 0;
285 priv->setup_done = 1;
286 spin_unlock_irqrestore(&priv->lock, flags);
287
288 dbg("%s(): submitting interrupt urb", __func__);
289 port->interrupt_in_urb->dev = port->serial->dev;
290 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
291 if (result != 0) {
292 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
293 " with error %d\n", __func__, result);
294 }
295 }
296
297 void send_data(struct work_struct *work)
298 {
299 struct oti6858_private *priv = container_of(work,
300 struct oti6858_private, delayed_write_work.work);
301 struct usb_serial_port *port = priv->port;
302 int count = 0, result;
303 unsigned long flags;
304 unsigned char allow;
305
306 dbg("%s(port = %d)", __func__, port->number);
307
308 spin_lock_irqsave(&priv->lock, flags);
309 if (priv->flags.write_urb_in_use) {
310 spin_unlock_irqrestore(&priv->lock, flags);
311 schedule_delayed_work(&priv->delayed_write_work,
312 msecs_to_jiffies(2));
313 return;
314 }
315 priv->flags.write_urb_in_use = 1;
316
317 count = oti6858_buf_data_avail(priv->buf);
318 spin_unlock_irqrestore(&priv->lock, flags);
319 if (count > port->bulk_out_size)
320 count = port->bulk_out_size;
321
322 if (count != 0) {
323 result = usb_control_msg(port->serial->dev,
324 usb_rcvctrlpipe(port->serial->dev, 0),
325 OTI6858_REQ_T_CHECK_TXBUFF,
326 OTI6858_REQ_CHECK_TXBUFF,
327 count, 0, &allow, 1, 100);
328 if (result != 1 || allow != 0)
329 count = 0;
330 }
331
332 if (count == 0) {
333 priv->flags.write_urb_in_use = 0;
334
335 dbg("%s(): submitting interrupt urb", __func__);
336 port->interrupt_in_urb->dev = port->serial->dev;
337 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
338 if (result != 0) {
339 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
340 " with error %d\n", __func__, result);
341 }
342 return;
343 }
344
345 spin_lock_irqsave(&priv->lock, flags);
346 oti6858_buf_get(priv->buf, port->write_urb->transfer_buffer, count);
347 spin_unlock_irqrestore(&priv->lock, flags);
348
349 port->write_urb->transfer_buffer_length = count;
350 port->write_urb->dev = port->serial->dev;
351 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
352 if (result != 0) {
353 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
354 " with error %d\n", __func__, result);
355 priv->flags.write_urb_in_use = 0;
356 }
357
358 usb_serial_port_softint(port);
359 }
360
361 static int oti6858_startup(struct usb_serial *serial)
362 {
363 struct usb_serial_port *port = serial->port[0];
364 struct oti6858_private *priv;
365 int i;
366
367 for (i = 0; i < serial->num_ports; ++i) {
368 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);
369 if (!priv)
370 break;
371 priv->buf = oti6858_buf_alloc(PL2303_BUF_SIZE);
372 if (priv->buf == NULL) {
373 kfree(priv);
374 break;
375 }
376
377 spin_lock_init(&priv->lock);
378 init_waitqueue_head(&priv->intr_wait);
379 /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */
380 /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */
381 priv->port = port;
382 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
383 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
384
385 usb_set_serial_port_data(serial->port[i], priv);
386 }
387 if (i == serial->num_ports)
388 return 0;
389
390 for (--i; i >= 0; --i) {
391 priv = usb_get_serial_port_data(serial->port[i]);
392 oti6858_buf_free(priv->buf);
393 kfree(priv);
394 usb_set_serial_port_data(serial->port[i], NULL);
395 }
396 return -ENOMEM;
397 }
398
399 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
400 const unsigned char *buf, int count)
401 {
402 struct oti6858_private *priv = usb_get_serial_port_data(port);
403 unsigned long flags;
404
405 dbg("%s(port = %d, count = %d)", __func__, port->number, count);
406
407 if (!count)
408 return count;
409
410 spin_lock_irqsave(&priv->lock, flags);
411 count = oti6858_buf_put(priv->buf, buf, count);
412 spin_unlock_irqrestore(&priv->lock, flags);
413
414 return count;
415 }
416
417 static int oti6858_write_room(struct tty_struct *tty)
418 {
419 struct usb_serial_port *port = tty->driver_data;
420 struct oti6858_private *priv = usb_get_serial_port_data(port);
421 int room = 0;
422 unsigned long flags;
423
424 dbg("%s(port = %d)", __func__, port->number);
425
426 spin_lock_irqsave(&priv->lock, flags);
427 room = oti6858_buf_space_avail(priv->buf);
428 spin_unlock_irqrestore(&priv->lock, flags);
429
430 return room;
431 }
432
433 static int oti6858_chars_in_buffer(struct tty_struct *tty)
434 {
435 struct usb_serial_port *port = tty->driver_data;
436 struct oti6858_private *priv = usb_get_serial_port_data(port);
437 int chars = 0;
438 unsigned long flags;
439
440 dbg("%s(port = %d)", __func__, port->number);
441
442 spin_lock_irqsave(&priv->lock, flags);
443 chars = oti6858_buf_data_avail(priv->buf);
444 spin_unlock_irqrestore(&priv->lock, flags);
445
446 return chars;
447 }
448
449 static void oti6858_set_termios(struct tty_struct *tty,
450 struct usb_serial_port *port, struct ktermios *old_termios)
451 {
452 struct oti6858_private *priv = usb_get_serial_port_data(port);
453 unsigned long flags;
454 unsigned int cflag;
455 u8 frame_fmt, control;
456 __le16 divisor;
457 int br;
458
459 dbg("%s(port = %d)", __func__, port->number);
460
461 if (!tty) {
462 dbg("%s(): no tty structures", __func__);
463 return;
464 }
465
466 spin_lock_irqsave(&priv->lock, flags);
467 if (!priv->flags.termios_initialized) {
468 *(tty->termios) = tty_std_termios;
469 tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
470 tty->termios->c_ispeed = 38400;
471 tty->termios->c_ospeed = 38400;
472 priv->flags.termios_initialized = 1;
473 }
474 spin_unlock_irqrestore(&priv->lock, flags);
475
476 cflag = tty->termios->c_cflag;
477
478 spin_lock_irqsave(&priv->lock, flags);
479 divisor = priv->pending_setup.divisor;
480 frame_fmt = priv->pending_setup.frame_fmt;
481 control = priv->pending_setup.control;
482 spin_unlock_irqrestore(&priv->lock, flags);
483
484 frame_fmt &= ~FMT_DATA_BITS_MASK;
485 switch (cflag & CSIZE) {
486 case CS5:
487 frame_fmt |= FMT_DATA_BITS_5;
488 break;
489 case CS6:
490 frame_fmt |= FMT_DATA_BITS_6;
491 break;
492 case CS7:
493 frame_fmt |= FMT_DATA_BITS_7;
494 break;
495 default:
496 case CS8:
497 frame_fmt |= FMT_DATA_BITS_8;
498 break;
499 }
500
501 /* manufacturer claims that this device can work with baud rates
502 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
503 * guarantee that any other baud rate will work (especially
504 * the higher ones)
505 */
506 br = tty_get_baud_rate(tty);
507 if (br == 0) {
508 divisor = 0;
509 } else {
510 int real_br;
511 int new_divisor;
512 br = min(br, OTI6858_MAX_BAUD_RATE);
513
514 new_divisor = (96000000 + 8 * br) / (16 * br);
515 real_br = 96000000 / (16 * new_divisor);
516 divisor = cpu_to_le16(new_divisor);
517 tty_encode_baud_rate(tty, real_br, real_br);
518 }
519
520 frame_fmt &= ~FMT_STOP_BITS_MASK;
521 if ((cflag & CSTOPB) != 0)
522 frame_fmt |= FMT_STOP_BITS_2;
523 else
524 frame_fmt |= FMT_STOP_BITS_1;
525
526 frame_fmt &= ~FMT_PARITY_MASK;
527 if ((cflag & PARENB) != 0) {
528 if ((cflag & PARODD) != 0)
529 frame_fmt |= FMT_PARITY_ODD;
530 else
531 frame_fmt |= FMT_PARITY_EVEN;
532 } else {
533 frame_fmt |= FMT_PARITY_NONE;
534 }
535
536 control &= ~CONTROL_MASK;
537 if ((cflag & CRTSCTS) != 0)
538 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
539
540 /* change control lines if we are switching to or from B0 */
541 /* FIXME:
542 spin_lock_irqsave(&priv->lock, flags);
543 control = priv->line_control;
544 if ((cflag & CBAUD) == B0)
545 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
546 else
547 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
548 if (control != priv->line_control) {
549 control = priv->line_control;
550 spin_unlock_irqrestore(&priv->lock, flags);
551 set_control_lines(serial->dev, control);
552 } else {
553 spin_unlock_irqrestore(&priv->lock, flags);
554 }
555 */
556
557 spin_lock_irqsave(&priv->lock, flags);
558 if (divisor != priv->pending_setup.divisor
559 || control != priv->pending_setup.control
560 || frame_fmt != priv->pending_setup.frame_fmt) {
561 priv->pending_setup.divisor = divisor;
562 priv->pending_setup.control = control;
563 priv->pending_setup.frame_fmt = frame_fmt;
564 }
565 spin_unlock_irqrestore(&priv->lock, flags);
566 }
567
568 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
569 {
570 struct oti6858_private *priv = usb_get_serial_port_data(port);
571 struct ktermios tmp_termios;
572 struct usb_serial *serial = port->serial;
573 struct oti6858_control_pkt *buf;
574 unsigned long flags;
575 int result;
576
577 dbg("%s(port = %d)", __func__, port->number);
578
579 usb_clear_halt(serial->dev, port->write_urb->pipe);
580 usb_clear_halt(serial->dev, port->read_urb->pipe);
581
582 if (port->port.count != 1)
583 return 0;
584
585 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
586 if (buf == NULL) {
587 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
588 return -ENOMEM;
589 }
590
591 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
592 OTI6858_REQ_T_GET_STATUS,
593 OTI6858_REQ_GET_STATUS,
594 0, 0,
595 buf, OTI6858_CTRL_PKT_SIZE,
596 100);
597 if (result != OTI6858_CTRL_PKT_SIZE) {
598 /* assume default (after power-on reset) values */
599 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
600 buf->frame_fmt = 0x03; /* 8N1 */
601 buf->something = 0x43;
602 buf->control = 0x4c; /* DTR, RTS */
603 buf->tx_status = 0x00;
604 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
605 buf->rx_bytes_avail = 0x00;
606 }
607
608 spin_lock_irqsave(&priv->lock, flags);
609 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
610 priv->pending_setup.divisor = buf->divisor;
611 priv->pending_setup.frame_fmt = buf->frame_fmt;
612 priv->pending_setup.control = buf->control;
613 spin_unlock_irqrestore(&priv->lock, flags);
614 kfree(buf);
615
616 dbg("%s(): submitting interrupt urb", __func__);
617 port->interrupt_in_urb->dev = serial->dev;
618 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
619 if (result != 0) {
620 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
621 " with error %d\n", __func__, result);
622 oti6858_close(port);
623 return -EPROTO;
624 }
625
626 /* setup termios */
627 if (tty)
628 oti6858_set_termios(tty, port, &tmp_termios);
629 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
630 return 0;
631 }
632
633 static void oti6858_close(struct usb_serial_port *port)
634 {
635 struct oti6858_private *priv = usb_get_serial_port_data(port);
636 unsigned long flags;
637
638 dbg("%s(port = %d)", __func__, port->number);
639
640 spin_lock_irqsave(&priv->lock, flags);
641 /* clear out any remaining data in the buffer */
642 oti6858_buf_clear(priv->buf);
643 spin_unlock_irqrestore(&priv->lock, flags);
644
645 dbg("%s(): after buf_clear()", __func__);
646
647 /* cancel scheduled setup */
648 cancel_delayed_work(&priv->delayed_setup_work);
649 cancel_delayed_work(&priv->delayed_write_work);
650 flush_scheduled_work();
651
652 /* shutdown our urbs */
653 dbg("%s(): shutting down urbs", __func__);
654 usb_kill_urb(port->write_urb);
655 usb_kill_urb(port->read_urb);
656 usb_kill_urb(port->interrupt_in_urb);
657 }
658
659 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
660 unsigned int set, unsigned int clear)
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 u8 control;
666
667 dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)",
668 __func__, port->number, set, clear);
669
670 if (!usb_get_intfdata(port->serial->interface))
671 return -ENODEV;
672
673 /* FIXME: check if this is correct (active high/low) */
674 spin_lock_irqsave(&priv->lock, flags);
675 control = priv->pending_setup.control;
676 if ((set & TIOCM_RTS) != 0)
677 control |= CONTROL_RTS_HIGH;
678 if ((set & TIOCM_DTR) != 0)
679 control |= CONTROL_DTR_HIGH;
680 if ((clear & TIOCM_RTS) != 0)
681 control &= ~CONTROL_RTS_HIGH;
682 if ((clear & TIOCM_DTR) != 0)
683 control &= ~CONTROL_DTR_HIGH;
684
685 if (control != priv->pending_setup.control)
686 priv->pending_setup.control = control;
687
688 spin_unlock_irqrestore(&priv->lock, flags);
689 return 0;
690 }
691
692 static int oti6858_tiocmget(struct tty_struct *tty, struct file *file)
693 {
694 struct usb_serial_port *port = tty->driver_data;
695 struct oti6858_private *priv = usb_get_serial_port_data(port);
696 unsigned long flags;
697 unsigned pin_state;
698 unsigned result = 0;
699
700 dbg("%s(port = %d)", __func__, port->number);
701
702 if (!usb_get_intfdata(port->serial->interface))
703 return -ENODEV;
704
705 spin_lock_irqsave(&priv->lock, flags);
706 pin_state = priv->status.pin_state & PIN_MASK;
707 spin_unlock_irqrestore(&priv->lock, flags);
708
709 /* FIXME: check if this is correct (active high/low) */
710 if ((pin_state & PIN_RTS) != 0)
711 result |= TIOCM_RTS;
712 if ((pin_state & PIN_CTS) != 0)
713 result |= TIOCM_CTS;
714 if ((pin_state & PIN_DSR) != 0)
715 result |= TIOCM_DSR;
716 if ((pin_state & PIN_DTR) != 0)
717 result |= TIOCM_DTR;
718 if ((pin_state & PIN_RI) != 0)
719 result |= TIOCM_RI;
720 if ((pin_state & PIN_DCD) != 0)
721 result |= TIOCM_CD;
722
723 dbg("%s() = 0x%08x", __func__, result);
724
725 return result;
726 }
727
728 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
729 {
730 struct oti6858_private *priv = usb_get_serial_port_data(port);
731 unsigned long flags;
732 unsigned int prev, status;
733 unsigned int changed;
734
735 spin_lock_irqsave(&priv->lock, flags);
736 prev = priv->status.pin_state;
737 spin_unlock_irqrestore(&priv->lock, flags);
738
739 while (1) {
740 wait_event_interruptible(priv->intr_wait,
741 priv->status.pin_state != prev);
742 if (signal_pending(current))
743 return -ERESTARTSYS;
744
745 spin_lock_irqsave(&priv->lock, flags);
746 status = priv->status.pin_state & PIN_MASK;
747 spin_unlock_irqrestore(&priv->lock, flags);
748
749 changed = prev ^ status;
750 /* FIXME: check if this is correct (active high/low) */
751 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
752 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
753 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
754 ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
755 return 0;
756 prev = status;
757 }
758
759 /* NOTREACHED */
760 return 0;
761 }
762
763 static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
764 unsigned int cmd, unsigned long arg)
765 {
766 struct usb_serial_port *port = tty->driver_data;
767
768 dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)",
769 __func__, port->number, cmd, arg);
770
771 switch (cmd) {
772 case TIOCMIWAIT:
773 dbg("%s(): TIOCMIWAIT", __func__);
774 return wait_modem_info(port, arg);
775 default:
776 dbg("%s(): 0x%04x not supported", __func__, cmd);
777 break;
778 }
779 return -ENOIOCTLCMD;
780 }
781
782
783 static void oti6858_release(struct usb_serial *serial)
784 {
785 struct oti6858_private *priv;
786 int i;
787
788 dbg("%s()", __func__);
789
790 for (i = 0; i < serial->num_ports; ++i) {
791 priv = usb_get_serial_port_data(serial->port[i]);
792 if (priv) {
793 oti6858_buf_free(priv->buf);
794 kfree(priv);
795 }
796 }
797 }
798
799 static void oti6858_read_int_callback(struct urb *urb)
800 {
801 struct usb_serial_port *port = urb->context;
802 struct oti6858_private *priv = usb_get_serial_port_data(port);
803 int transient = 0, can_recv = 0, resubmit = 1;
804 int status = urb->status;
805
806 dbg("%s(port = %d, status = %d)",
807 __func__, port->number, status);
808
809 switch (status) {
810 case 0:
811 /* success */
812 break;
813 case -ECONNRESET:
814 case -ENOENT:
815 case -ESHUTDOWN:
816 /* this urb is terminated, clean up */
817 dbg("%s(): urb shutting down with status: %d",
818 __func__, status);
819 return;
820 default:
821 dbg("%s(): nonzero urb status received: %d",
822 __func__, status);
823 break;
824 }
825
826 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
827 struct oti6858_control_pkt *xs = urb->transfer_buffer;
828 unsigned long flags;
829
830 spin_lock_irqsave(&priv->lock, flags);
831
832 if (!priv->transient) {
833 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
834 if (xs->rx_bytes_avail == 0) {
835 priv->transient = 4;
836 priv->setup_done = 0;
837 resubmit = 0;
838 dbg("%s(): scheduling setup_line()",
839 __func__);
840 schedule_delayed_work(&priv->delayed_setup_work, 0);
841 }
842 }
843 } else {
844 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
845 priv->transient = 0;
846 } else if (!priv->setup_done) {
847 resubmit = 0;
848 } else if (--priv->transient == 0) {
849 if (xs->rx_bytes_avail == 0) {
850 priv->transient = 4;
851 priv->setup_done = 0;
852 resubmit = 0;
853 dbg("%s(): scheduling setup_line()",
854 __func__);
855 schedule_delayed_work(&priv->delayed_setup_work, 0);
856 }
857 }
858 }
859
860 if (!priv->transient) {
861 if (xs->pin_state != priv->status.pin_state)
862 wake_up_interruptible(&priv->intr_wait);
863 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
864 }
865
866 if (!priv->transient && xs->rx_bytes_avail != 0) {
867 can_recv = xs->rx_bytes_avail;
868 priv->flags.read_urb_in_use = 1;
869 }
870
871 transient = priv->transient;
872 spin_unlock_irqrestore(&priv->lock, flags);
873 }
874
875 if (can_recv) {
876 int result;
877
878 port->read_urb->dev = port->serial->dev;
879 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
880 if (result != 0) {
881 priv->flags.read_urb_in_use = 0;
882 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
883 " error %d\n", __func__, result);
884 } else {
885 resubmit = 0;
886 }
887 } else if (!transient) {
888 unsigned long flags;
889
890 spin_lock_irqsave(&priv->lock, flags);
891 if (priv->flags.write_urb_in_use == 0
892 && oti6858_buf_data_avail(priv->buf) != 0) {
893 schedule_delayed_work(&priv->delayed_write_work, 0);
894 resubmit = 0;
895 }
896 spin_unlock_irqrestore(&priv->lock, flags);
897 }
898
899 if (resubmit) {
900 int result;
901
902 /* dbg("%s(): submitting interrupt urb", __func__); */
903 urb->dev = port->serial->dev;
904 result = usb_submit_urb(urb, GFP_ATOMIC);
905 if (result != 0) {
906 dev_err(&urb->dev->dev,
907 "%s(): usb_submit_urb() failed with"
908 " error %d\n", __func__, result);
909 }
910 }
911 }
912
913 static void oti6858_read_bulk_callback(struct urb *urb)
914 {
915 struct usb_serial_port *port = urb->context;
916 struct oti6858_private *priv = usb_get_serial_port_data(port);
917 struct tty_struct *tty;
918 unsigned char *data = urb->transfer_buffer;
919 unsigned long flags;
920 int status = urb->status;
921 int result;
922
923 dbg("%s(port = %d, status = %d)",
924 __func__, port->number, status);
925
926 spin_lock_irqsave(&priv->lock, flags);
927 priv->flags.read_urb_in_use = 0;
928 spin_unlock_irqrestore(&priv->lock, flags);
929
930 if (status != 0) {
931 if (!port->port.count) {
932 dbg("%s(): port is closed, exiting", __func__);
933 return;
934 }
935 /*
936 if (status == -EPROTO) {
937 * PL2303 mysteriously fails with -EPROTO reschedule
938 the read *
939 dbg("%s - caught -EPROTO, resubmitting the urb",
940 __func__);
941 result = usb_submit_urb(urb, GFP_ATOMIC);
942 if (result)
943 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);
944 return;
945 }
946 */
947 dbg("%s(): unable to handle the error, exiting", __func__);
948 return;
949 }
950
951 tty = tty_port_tty_get(&port->port);
952 if (tty != NULL && urb->actual_length > 0) {
953 tty_insert_flip_string(tty, data, urb->actual_length);
954 tty_flip_buffer_push(tty);
955 }
956 tty_kref_put(tty);
957
958 /* schedule the interrupt urb if we are still open */
959 if (port->port.count != 0) {
960 port->interrupt_in_urb->dev = port->serial->dev;
961 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
962 if (result != 0) {
963 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
964 " error %d\n", __func__, result);
965 }
966 }
967 }
968
969 static void oti6858_write_bulk_callback(struct urb *urb)
970 {
971 struct usb_serial_port *port = urb->context;
972 struct oti6858_private *priv = usb_get_serial_port_data(port);
973 int status = urb->status;
974 int result;
975
976 dbg("%s(port = %d, status = %d)",
977 __func__, port->number, status);
978
979 switch (status) {
980 case 0:
981 /* success */
982 break;
983 case -ECONNRESET:
984 case -ENOENT:
985 case -ESHUTDOWN:
986 /* this urb is terminated, clean up */
987 dbg("%s(): urb shutting down with status: %d",
988 __func__, status);
989 priv->flags.write_urb_in_use = 0;
990 return;
991 default:
992 /* error in the urb, so we have to resubmit it */
993 dbg("%s(): nonzero write bulk status received: %d",
994 __func__, status);
995 dbg("%s(): overflow in write", __func__);
996
997 port->write_urb->transfer_buffer_length = 1;
998 port->write_urb->dev = port->serial->dev;
999 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1000 if (result) {
1001 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
1002 " error %d\n", __func__, result);
1003 } else {
1004 return;
1005 }
1006 }
1007
1008 priv->flags.write_urb_in_use = 0;
1009
1010 /* schedule the interrupt urb if we are still open */
1011 port->interrupt_in_urb->dev = port->serial->dev;
1012 dbg("%s(): submitting interrupt urb", __func__);
1013 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1014 if (result != 0) {
1015 dev_err(&port->dev, "%s(): failed submitting int urb,"
1016 " error %d\n", __func__, result);
1017 }
1018 }
1019
1020
1021 /*
1022 * oti6858_buf_alloc
1023 *
1024 * Allocate a circular buffer and all associated memory.
1025 */
1026 static struct oti6858_buf *oti6858_buf_alloc(unsigned int size)
1027 {
1028 struct oti6858_buf *pb;
1029
1030 if (size == 0)
1031 return NULL;
1032
1033 pb = kmalloc(sizeof(struct oti6858_buf), GFP_KERNEL);
1034 if (pb == NULL)
1035 return NULL;
1036
1037 pb->buf_buf = kmalloc(size, GFP_KERNEL);
1038 if (pb->buf_buf == NULL) {
1039 kfree(pb);
1040 return NULL;
1041 }
1042
1043 pb->buf_size = size;
1044 pb->buf_get = pb->buf_put = pb->buf_buf;
1045
1046 return pb;
1047 }
1048
1049 /*
1050 * oti6858_buf_free
1051 *
1052 * Free the buffer and all associated memory.
1053 */
1054 static void oti6858_buf_free(struct oti6858_buf *pb)
1055 {
1056 if (pb) {
1057 kfree(pb->buf_buf);
1058 kfree(pb);
1059 }
1060 }
1061
1062 /*
1063 * oti6858_buf_clear
1064 *
1065 * Clear out all data in the circular buffer.
1066 */
1067 static void oti6858_buf_clear(struct oti6858_buf *pb)
1068 {
1069 if (pb != NULL) {
1070 /* equivalent to a get of all data available */
1071 pb->buf_get = pb->buf_put;
1072 }
1073 }
1074
1075 /*
1076 * oti6858_buf_data_avail
1077 *
1078 * Return the number of bytes of data available in the circular
1079 * buffer.
1080 */
1081 static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb)
1082 {
1083 if (pb == NULL)
1084 return 0;
1085 return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
1086 }
1087
1088 /*
1089 * oti6858_buf_space_avail
1090 *
1091 * Return the number of bytes of space available in the circular
1092 * buffer.
1093 */
1094 static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb)
1095 {
1096 if (pb == NULL)
1097 return 0;
1098 return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
1099 }
1100
1101 /*
1102 * oti6858_buf_put
1103 *
1104 * Copy data data from a user buffer and put it into the circular buffer.
1105 * Restrict to the amount of space available.
1106 *
1107 * Return the number of bytes copied.
1108 */
1109 static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf,
1110 unsigned int count)
1111 {
1112 unsigned int len;
1113
1114 if (pb == NULL)
1115 return 0;
1116
1117 len = oti6858_buf_space_avail(pb);
1118 if (count > len)
1119 count = len;
1120
1121 if (count == 0)
1122 return 0;
1123
1124 len = pb->buf_buf + pb->buf_size - pb->buf_put;
1125 if (count > len) {
1126 memcpy(pb->buf_put, buf, len);
1127 memcpy(pb->buf_buf, buf+len, count - len);
1128 pb->buf_put = pb->buf_buf + count - len;
1129 } else {
1130 memcpy(pb->buf_put, buf, count);
1131 if (count < len)
1132 pb->buf_put += count;
1133 else /* count == len */
1134 pb->buf_put = pb->buf_buf;
1135 }
1136
1137 return count;
1138 }
1139
1140 /*
1141 * oti6858_buf_get
1142 *
1143 * Get data from the circular buffer and copy to the given buffer.
1144 * Restrict to the amount of data available.
1145 *
1146 * Return the number of bytes copied.
1147 */
1148 static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf,
1149 unsigned int count)
1150 {
1151 unsigned int len;
1152
1153 if (pb == NULL)
1154 return 0;
1155
1156 len = oti6858_buf_data_avail(pb);
1157 if (count > len)
1158 count = len;
1159
1160 if (count == 0)
1161 return 0;
1162
1163 len = pb->buf_buf + pb->buf_size - pb->buf_get;
1164 if (count > len) {
1165 memcpy(buf, pb->buf_get, len);
1166 memcpy(buf+len, pb->buf_buf, count - len);
1167 pb->buf_get = pb->buf_buf + count - len;
1168 } else {
1169 memcpy(buf, pb->buf_get, count);
1170 if (count < len)
1171 pb->buf_get += count;
1172 else /* count == len */
1173 pb->buf_get = pb->buf_buf;
1174 }
1175
1176 return count;
1177 }
1178
1179 /* module description and (de)initialization */
1180
1181 static int __init oti6858_init(void)
1182 {
1183 int retval;
1184
1185 retval = usb_serial_register(&oti6858_device);
1186 if (retval == 0) {
1187 retval = usb_register(&oti6858_driver);
1188 if (retval)
1189 usb_serial_deregister(&oti6858_device);
1190 }
1191 return retval;
1192 }
1193
1194 static void __exit oti6858_exit(void)
1195 {
1196 usb_deregister(&oti6858_driver);
1197 usb_serial_deregister(&oti6858_device);
1198 }
1199
1200 module_init(oti6858_init);
1201 module_exit(oti6858_exit);
1202
1203 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
1204 MODULE_AUTHOR(OTI6858_AUTHOR);
1205 MODULE_VERSION(OTI6858_VERSION);
1206 MODULE_LICENSE("GPL");
1207
1208 module_param(debug, bool, S_IRUGO | S_IWUSR);
1209 MODULE_PARM_DESC(debug, "enable debug output");
1210
Linux kernel - Deliverables
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