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USB: serial: oti6858: clean up urb->status usage
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / serial / oti6858.c
blobd7db71eca5209bf386a8edc2286f232c0c8ed886
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 driver
29 *
30 * TODO:
31 * - implement correct flushing for ioctls and oti6858_close()
32 * - check how errors (rx overflow, parity error, framing error) are reported
33 * - implement oti6858_break_ctl()
34 * - implement more ioctls
35 * - test/implement flow control
36 * - allow setting custom baud rates
37 */
38
39 #include <linux/kernel.h>
40 #include <linux/errno.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/tty.h>
44 #include <linux/tty_driver.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/module.h>
48 #include <linux/moduleparam.h>
49 #include <linux/spinlock.h>
50 #include <linux/usb.h>
51 #include <linux/usb/serial.h>
52 #include <asm/uaccess.h>
53 #include "oti6858.h"
54
55 #define OTI6858_DESCRIPTION \
56 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
57 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
58 #define OTI6858_VERSION "0.1"
59
60 static struct usb_device_id id_table [] = {
61 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
62 { }
63 };
64
65 MODULE_DEVICE_TABLE(usb, id_table);
66
67 static struct usb_driver oti6858_driver = {
68 .name = "oti6858",
69 .probe = usb_serial_probe,
70 .disconnect = usb_serial_disconnect,
71 .id_table = id_table,
72 .no_dynamic_id = 1,
73 };
74
75 static int debug;
76
77
78 /* buffering code, copied from pl2303 driver */
79 #define PL2303_BUF_SIZE 1024
80 #define PL2303_TMP_BUF_SIZE 1024
81
82 struct pl2303_buf {
83 unsigned int buf_size;
84 char *buf_buf;
85 char *buf_get;
86 char *buf_put;
87 };
88
89 /* requests */
90 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
91 #define OTI6858_REQ_T_GET_STATUS 0x01
92
93 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
94 #define OTI6858_REQ_T_SET_LINE 0x00
95
96 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
97 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
98
99 /* format of the control packet */
100 struct oti6858_control_pkt {
101 u16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
102 #define OTI6858_MAX_BAUD_RATE 3000000
103 u8 frame_fmt;
104 #define FMT_STOP_BITS_MASK 0xc0
105 #define FMT_STOP_BITS_1 0x00
106 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
107 #define FMT_PARITY_MASK 0x38
108 #define FMT_PARITY_NONE 0x00
109 #define FMT_PARITY_ODD 0x08
110 #define FMT_PARITY_EVEN 0x18
111 #define FMT_PARITY_MARK 0x28
112 #define FMT_PARITY_SPACE 0x38
113 #define FMT_DATA_BITS_MASK 0x03
114 #define FMT_DATA_BITS_5 0x00
115 #define FMT_DATA_BITS_6 0x01
116 #define FMT_DATA_BITS_7 0x02
117 #define FMT_DATA_BITS_8 0x03
118 u8 something; /* always equals 0x43 */
119 u8 control; /* settings of flow control lines */
120 #define CONTROL_MASK 0x0c
121 #define CONTROL_DTR_HIGH 0x08
122 #define CONTROL_RTS_HIGH 0x04
123 u8 tx_status;
124 #define TX_BUFFER_EMPTIED 0x09
125 u8 pin_state;
126 #define PIN_MASK 0x3f
127 #define PIN_RTS 0x20 /* output pin */
128 #define PIN_CTS 0x10 /* input pin, active low */
129 #define PIN_DSR 0x08 /* input pin, active low */
130 #define PIN_DTR 0x04 /* output pin */
131 #define PIN_RI 0x02 /* input pin, active low */
132 #define PIN_DCD 0x01 /* input pin, active low */
133 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
134 };
135
136 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
137 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
138 ( ((a)->divisor == (priv)->pending_setup.divisor) \
139 && ((a)->control == (priv)->pending_setup.control) \
140 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt) )
141
142 /* function prototypes */
143 static int oti6858_open(struct usb_serial_port *port, struct file *filp);
144 static void oti6858_close(struct usb_serial_port *port, struct file *filp);
145 static void oti6858_set_termios(struct usb_serial_port *port,
146 struct ktermios *old);
147 static int oti6858_ioctl(struct usb_serial_port *port, struct file *file,
148 unsigned int cmd, unsigned long arg);
149 static void oti6858_read_int_callback(struct urb *urb);
150 static void oti6858_read_bulk_callback(struct urb *urb);
151 static void oti6858_write_bulk_callback(struct urb *urb);
152 static int oti6858_write(struct usb_serial_port *port,
153 const unsigned char *buf, int count);
154 static int oti6858_write_room(struct usb_serial_port *port);
155 static void oti6858_break_ctl(struct usb_serial_port *port, int break_state);
156 static int oti6858_chars_in_buffer(struct usb_serial_port *port);
157 static int oti6858_tiocmget(struct usb_serial_port *port, struct file *file);
158 static int oti6858_tiocmset(struct usb_serial_port *port, struct file *file,
159 unsigned int set, unsigned int clear);
160 static int oti6858_startup(struct usb_serial *serial);
161 static void oti6858_shutdown(struct usb_serial *serial);
162
163 /* functions operating on buffers */
164 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
165 static void pl2303_buf_free(struct pl2303_buf *pb);
166 static void pl2303_buf_clear(struct pl2303_buf *pb);
167 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
168 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
169 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
170 unsigned int count);
171 static unsigned int pl2303_buf_get(struct pl2303_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_interrupt_in = 1,
183 .num_bulk_in = 1,
184 .num_bulk_out = 1,
185 .num_ports = 1,
186 .open = oti6858_open,
187 .close = oti6858_close,
188 .write = oti6858_write,
189 .ioctl = oti6858_ioctl,
190 .break_ctl = oti6858_break_ctl,
191 .set_termios = oti6858_set_termios,
192 .tiocmget = oti6858_tiocmget,
193 .tiocmset = oti6858_tiocmset,
194 .read_bulk_callback = oti6858_read_bulk_callback,
195 .read_int_callback = oti6858_read_int_callback,
196 .write_bulk_callback = oti6858_write_bulk_callback,
197 .write_room = oti6858_write_room,
198 .chars_in_buffer = oti6858_chars_in_buffer,
199 .attach = oti6858_startup,
200 .shutdown = oti6858_shutdown,
201 };
202
203 struct oti6858_private {
204 spinlock_t lock;
205
206 struct pl2303_buf *buf;
207 struct oti6858_control_pkt status;
208
209 struct {
210 u8 read_urb_in_use;
211 u8 write_urb_in_use;
212 u8 termios_initialized;
213 } flags;
214 struct delayed_work delayed_write_work;
215
216 struct {
217 u16 divisor;
218 u8 frame_fmt;
219 u8 control;
220 } pending_setup;
221 u8 transient;
222 u8 setup_done;
223 struct delayed_work delayed_setup_work;
224
225 wait_queue_head_t intr_wait;
226 struct usb_serial_port *port; /* USB port with which associated */
227 };
228
229 #undef dbg
230 /* #define dbg(format, arg...) printk(KERN_INFO "%s: " format "\n", __FILE__, ## arg) */
231 #define dbg(format, arg...) printk(KERN_INFO "" format "\n", ## arg)
232
233 static void setup_line(struct work_struct *work)
234 {
235 struct oti6858_private *priv = container_of(work, struct oti6858_private, delayed_setup_work.work);
236 struct usb_serial_port *port = priv->port;
237 struct oti6858_control_pkt *new_setup;
238 unsigned long flags;
239 int result;
240
241 dbg("%s(port = %d)", __FUNCTION__, port->number);
242
243 if ((new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL)) == NULL) {
244 dev_err(&port->dev, "%s(): out of memory!\n", __FUNCTION__);
245 /* we will try again */
246 schedule_delayed_work(&priv->delayed_setup_work, msecs_to_jiffies(2));
247 return;
248 }
249
250 result = usb_control_msg(port->serial->dev,
251 usb_rcvctrlpipe(port->serial->dev, 0),
252 OTI6858_REQ_T_GET_STATUS,
253 OTI6858_REQ_GET_STATUS,
254 0, 0,
255 new_setup, OTI6858_CTRL_PKT_SIZE,
256 100);
257
258 if (result != OTI6858_CTRL_PKT_SIZE) {
259 dev_err(&port->dev, "%s(): error reading status", __FUNCTION__);
260 kfree(new_setup);
261 /* we will try again */
262 schedule_delayed_work(&priv->delayed_setup_work, msecs_to_jiffies(2));
263 return;
264 }
265
266 spin_lock_irqsave(&priv->lock, flags);
267 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
268 new_setup->divisor = priv->pending_setup.divisor;
269 new_setup->control = priv->pending_setup.control;
270 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
271
272 spin_unlock_irqrestore(&priv->lock, flags);
273 result = usb_control_msg(port->serial->dev,
274 usb_sndctrlpipe(port->serial->dev, 0),
275 OTI6858_REQ_T_SET_LINE,
276 OTI6858_REQ_SET_LINE,
277 0, 0,
278 new_setup, OTI6858_CTRL_PKT_SIZE,
279 100);
280 } else {
281 spin_unlock_irqrestore(&priv->lock, flags);
282 result = 0;
283 }
284 kfree(new_setup);
285
286 spin_lock_irqsave(&priv->lock, flags);
287 if (result != OTI6858_CTRL_PKT_SIZE)
288 priv->transient = 0;
289 priv->setup_done = 1;
290 spin_unlock_irqrestore(&priv->lock, flags);
291
292 dbg("%s(): submitting interrupt urb", __FUNCTION__);
293 port->interrupt_in_urb->dev = port->serial->dev;
294 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
295 if (result != 0) {
296 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
297 " with error %d\n", __FUNCTION__, result);
298 }
299 }
300
301 void send_data(struct work_struct *work)
302 {
303 struct oti6858_private *priv = container_of(work, struct oti6858_private, delayed_write_work.work);
304 struct usb_serial_port *port = priv->port;
305 int count = 0, result;
306 unsigned long flags;
307 unsigned char allow;
308
309 dbg("%s(port = %d)", __FUNCTION__, port->number);
310
311 spin_lock_irqsave(&priv->lock, flags);
312 if (priv->flags.write_urb_in_use) {
313 spin_unlock_irqrestore(&priv->lock, flags);
314 schedule_delayed_work(&priv->delayed_write_work, msecs_to_jiffies(2));
315 return;
316 }
317 priv->flags.write_urb_in_use = 1;
318
319 count = pl2303_buf_data_avail(priv->buf);
320 spin_unlock_irqrestore(&priv->lock, flags);
321 if (count > port->bulk_out_size)
322 count = port->bulk_out_size;
323
324 if (count != 0) {
325 result = usb_control_msg(port->serial->dev,
326 usb_rcvctrlpipe(port->serial->dev, 0),
327 OTI6858_REQ_T_CHECK_TXBUFF,
328 OTI6858_REQ_CHECK_TXBUFF,
329 count, 0, &allow, 1, 100);
330 if (result != 1 || allow != 0)
331 count = 0;
332 }
333
334 if (count == 0) {
335 priv->flags.write_urb_in_use = 0;
336
337 dbg("%s(): submitting interrupt urb", __FUNCTION__);
338 port->interrupt_in_urb->dev = port->serial->dev;
339 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
340 if (result != 0) {
341 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
342 " with error %d\n", __FUNCTION__, result);
343 }
344 return;
345 }
346
347 spin_lock_irqsave(&priv->lock, flags);
348 pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer, count);
349 spin_unlock_irqrestore(&priv->lock, flags);
350
351 port->write_urb->transfer_buffer_length = count;
352 port->write_urb->dev = port->serial->dev;
353 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
354 if (result != 0) {
355 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
356 " with error %d\n", __FUNCTION__, result);
357 priv->flags.write_urb_in_use = 0;
358 }
359
360 usb_serial_port_softint(port);
361 }
362
363 static int oti6858_startup(struct usb_serial *serial)
364 {
365 struct usb_serial_port *port = serial->port[0];
366 struct oti6858_private *priv;
367 int i;
368
369 for (i = 0; i < serial->num_ports; ++i) {
370 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);
371 if (!priv)
372 break;
373 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
374 if (priv->buf == NULL) {
375 kfree(priv);
376 break;
377 }
378
379 spin_lock_init(&priv->lock);
380 init_waitqueue_head(&priv->intr_wait);
381 // INIT_WORK(&priv->setup_work, setup_line, serial->port[i]);
382 // INIT_WORK(&priv->write_work, send_data, serial->port[i]);
383 priv->port = port;
384 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
385 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
386
387 usb_set_serial_port_data(serial->port[i], priv);
388 }
389 if (i == serial->num_ports)
390 return 0;
391
392 for (--i; i >= 0; --i) {
393 priv = usb_get_serial_port_data(serial->port[i]);
394 pl2303_buf_free(priv->buf);
395 kfree(priv);
396 usb_set_serial_port_data(serial->port[i], NULL);
397 }
398 return -ENOMEM;
399 }
400
401 static int oti6858_write(struct usb_serial_port *port,
402 const unsigned char *buf, int count)
403 {
404 struct oti6858_private *priv = usb_get_serial_port_data(port);
405 unsigned long flags;
406
407 dbg("%s(port = %d, count = %d)", __FUNCTION__, port->number, count);
408
409 if (!count)
410 return count;
411
412 spin_lock_irqsave(&priv->lock, flags);
413 count = pl2303_buf_put(priv->buf, buf, count);
414 spin_unlock_irqrestore(&priv->lock, flags);
415
416 return count;
417 }
418
419 static int oti6858_write_room(struct usb_serial_port *port)
420 {
421 struct oti6858_private *priv = usb_get_serial_port_data(port);
422 int room = 0;
423 unsigned long flags;
424
425 dbg("%s(port = %d)", __FUNCTION__, port->number);
426
427 spin_lock_irqsave(&priv->lock, flags);
428 room = pl2303_buf_space_avail(priv->buf);
429 spin_unlock_irqrestore(&priv->lock, flags);
430
431 return room;
432 }
433
434 static int oti6858_chars_in_buffer(struct usb_serial_port *port)
435 {
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)", __FUNCTION__, port->number);
441
442 spin_lock_irqsave(&priv->lock, flags);
443 chars = pl2303_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 usb_serial_port *port,
450 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 u16 divisor;
457 int br;
458
459 dbg("%s(port = %d)", __FUNCTION__, port->number);
460
461 if ((!port->tty) || (!port->tty->termios)) {
462 dbg("%s(): no tty structures", __FUNCTION__);
463 return;
464 }
465
466 spin_lock_irqsave(&priv->lock, flags);
467 if (!priv->flags.termios_initialized) {
468 *(port->tty->termios) = tty_std_termios;
469 port->tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
470 priv->flags.termios_initialized = 1;
471 }
472 spin_unlock_irqrestore(&priv->lock, flags);
473
474 cflag = port->tty->termios->c_cflag;
475
476 spin_lock_irqsave(&priv->lock, flags);
477 divisor = priv->pending_setup.divisor;
478 frame_fmt = priv->pending_setup.frame_fmt;
479 control = priv->pending_setup.control;
480 spin_unlock_irqrestore(&priv->lock, flags);
481
482 frame_fmt &= ~FMT_DATA_BITS_MASK;
483 switch (cflag & CSIZE) {
484 case CS5:
485 frame_fmt |= FMT_DATA_BITS_5;
486 break;
487 case CS6:
488 frame_fmt |= FMT_DATA_BITS_6;
489 break;
490 case CS7:
491 frame_fmt |= FMT_DATA_BITS_7;
492 break;
493 default:
494 case CS8:
495 frame_fmt |= FMT_DATA_BITS_8;
496 break;
497 }
498
499 /* manufacturer claims that this device can work with baud rates
500 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
501 * guarantee that any other baud rate will work (especially
502 * the higher ones)
503 */
504 br = tty_get_baud_rate(port->tty);
505 if (br == 0) {
506 divisor = 0;
507 } else if (br <= OTI6858_MAX_BAUD_RATE) {
508 int real_br;
509
510 divisor = (96000000 + 8 * br) / (16 * br);
511 real_br = 96000000 / (16 * divisor);
512 if ((((real_br - br) * 100 + br - 1) / br) > 2) {
513 dbg("%s(): baud rate %d is invalid", __FUNCTION__, br);
514 return;
515 }
516 divisor = cpu_to_le16(divisor);
517 } else {
518 dbg("%s(): baud rate %d is too high", __FUNCTION__, br);
519 return;
520 }
521
522 frame_fmt &= ~FMT_STOP_BITS_MASK;
523 if ((cflag & CSTOPB) != 0) {
524 frame_fmt |= FMT_STOP_BITS_2;
525 } else {
526 frame_fmt |= FMT_STOP_BITS_1;
527 }
528
529 frame_fmt &= ~FMT_PARITY_MASK;
530 if ((cflag & PARENB) != 0) {
531 if ((cflag & PARODD) != 0) {
532 frame_fmt |= FMT_PARITY_ODD;
533 } else {
534 frame_fmt |= FMT_PARITY_EVEN;
535 }
536 } else {
537 frame_fmt |= FMT_PARITY_NONE;
538 }
539
540 control &= ~CONTROL_MASK;
541 if ((cflag & CRTSCTS) != 0)
542 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
543
544 /* change control lines if we are switching to or from B0 */
545 /* FIXME:
546 spin_lock_irqsave(&priv->lock, flags);
547 control = priv->line_control;
548 if ((cflag & CBAUD) == B0)
549 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
550 else
551 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
552 if (control != priv->line_control) {
553 control = priv->line_control;
554 spin_unlock_irqrestore(&priv->lock, flags);
555 set_control_lines(serial->dev, control);
556 } else {
557 spin_unlock_irqrestore(&priv->lock, flags);
558 }
559 */
560
561 spin_lock_irqsave(&priv->lock, flags);
562 if (divisor != priv->pending_setup.divisor
563 || control != priv->pending_setup.control
564 || frame_fmt != priv->pending_setup.frame_fmt) {
565 priv->pending_setup.divisor = divisor;
566 priv->pending_setup.control = control;
567 priv->pending_setup.frame_fmt = frame_fmt;
568 }
569 spin_unlock_irqrestore(&priv->lock, flags);
570 }
571
572 static int oti6858_open(struct usb_serial_port *port, struct file *filp)
573 {
574 struct oti6858_private *priv = usb_get_serial_port_data(port);
575 struct ktermios tmp_termios;
576 struct usb_serial *serial = port->serial;
577 struct oti6858_control_pkt *buf;
578 unsigned long flags;
579 int result;
580
581 dbg("%s(port = %d)", __FUNCTION__, port->number);
582
583 usb_clear_halt(serial->dev, port->write_urb->pipe);
584 usb_clear_halt(serial->dev, port->read_urb->pipe);
585
586 if (port->open_count != 1)
587 return 0;
588
589 if ((buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL)) == NULL) {
590 dev_err(&port->dev, "%s(): out of memory!\n", __FUNCTION__);
591 return -ENOMEM;
592 }
593
594 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
595 OTI6858_REQ_T_GET_STATUS,
596 OTI6858_REQ_GET_STATUS,
597 0, 0,
598 buf, OTI6858_CTRL_PKT_SIZE,
599 100);
600 if (result != OTI6858_CTRL_PKT_SIZE) {
601 /* assume default (after power-on reset) values */
602 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
603 buf->frame_fmt = 0x03; /* 8N1 */
604 buf->something = 0x43;
605 buf->control = 0x4c; /* DTR, RTS */
606 buf->tx_status = 0x00;
607 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
608 buf->rx_bytes_avail = 0x00;
609 }
610
611 spin_lock_irqsave(&priv->lock, flags);
612 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
613 priv->pending_setup.divisor = buf->divisor;
614 priv->pending_setup.frame_fmt = buf->frame_fmt;
615 priv->pending_setup.control = buf->control;
616 spin_unlock_irqrestore(&priv->lock, flags);
617 kfree(buf);
618
619 dbg("%s(): submitting interrupt urb", __FUNCTION__);
620 port->interrupt_in_urb->dev = serial->dev;
621 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
622 if (result != 0) {
623 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
624 " with error %d\n", __FUNCTION__, result);
625 oti6858_close(port, NULL);
626 return -EPROTO;
627 }
628
629 /* setup termios */
630 if (port->tty)
631 oti6858_set_termios(port, &tmp_termios);
632
633 return 0;
634 }
635
636 static void oti6858_close(struct usb_serial_port *port, struct file *filp)
637 {
638 struct oti6858_private *priv = usb_get_serial_port_data(port);
639 unsigned long flags;
640 long timeout;
641 wait_queue_t wait;
642
643 dbg("%s(port = %d)", __FUNCTION__, port->number);
644
645 /* wait for data to drain from the buffer */
646 spin_lock_irqsave(&priv->lock, flags);
647 timeout = 30 * HZ; /* PL2303_CLOSING_WAIT */
648 init_waitqueue_entry(&wait, current);
649 add_wait_queue(&port->tty->write_wait, &wait);
650 dbg("%s(): entering wait loop", __FUNCTION__);
651 for (;;) {
652 set_current_state(TASK_INTERRUPTIBLE);
653 if (pl2303_buf_data_avail(priv->buf) == 0
654 || timeout == 0 || signal_pending(current)
655 || !usb_get_intfdata(port->serial->interface)) /* disconnect */
656 break;
657 spin_unlock_irqrestore(&priv->lock, flags);
658 timeout = schedule_timeout(timeout);
659 spin_lock_irqsave(&priv->lock, flags);
660 }
661 set_current_state(TASK_RUNNING);
662 remove_wait_queue(&port->tty->write_wait, &wait);
663 dbg("%s(): after wait loop", __FUNCTION__);
664
665 /* clear out any remaining data in the buffer */
666 pl2303_buf_clear(priv->buf);
667 spin_unlock_irqrestore(&priv->lock, flags);
668
669 /* wait for characters to drain from the device */
670 /* (this is long enough for the entire 256 byte */
671 /* pl2303 hardware buffer to drain with no flow */
672 /* control for data rates of 1200 bps or more, */
673 /* for lower rates we should really know how much */
674 /* data is in the buffer to compute a delay */
675 /* that is not unnecessarily long) */
676 /* FIXME
677 bps = tty_get_baud_rate(port->tty);
678 if (bps > 1200)
679 timeout = max((HZ*2560)/bps,HZ/10);
680 else
681 */
682 timeout = 2*HZ;
683 schedule_timeout_interruptible(timeout);
684 dbg("%s(): after schedule_timeout_interruptible()", __FUNCTION__);
685
686 /* cancel scheduled setup */
687 cancel_delayed_work(&priv->delayed_setup_work);
688 cancel_delayed_work(&priv->delayed_write_work);
689 flush_scheduled_work();
690
691 /* shutdown our urbs */
692 dbg("%s(): shutting down urbs", __FUNCTION__);
693 usb_kill_urb(port->write_urb);
694 usb_kill_urb(port->read_urb);
695 usb_kill_urb(port->interrupt_in_urb);
696
697 /*
698 if (port->tty && (port->tty->termios->c_cflag) & HUPCL) {
699 // drop DTR and RTS
700 spin_lock_irqsave(&priv->lock, flags);
701 priv->pending_setup.control &= ~CONTROL_MASK;
702 spin_unlock_irqrestore(&priv->lock, flags);
703 }
704 */
705 }
706
707 static int oti6858_tiocmset(struct usb_serial_port *port, struct file *file,
708 unsigned int set, unsigned int clear)
709 {
710 struct oti6858_private *priv = usb_get_serial_port_data(port);
711 unsigned long flags;
712 u8 control;
713
714 dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)",
715 __FUNCTION__, port->number, set, clear);
716
717 if (!usb_get_intfdata(port->serial->interface))
718 return -ENODEV;
719
720 /* FIXME: check if this is correct (active high/low) */
721 spin_lock_irqsave(&priv->lock, flags);
722 control = priv->pending_setup.control;
723 if ((set & TIOCM_RTS) != 0)
724 control |= CONTROL_RTS_HIGH;
725 if ((set & TIOCM_DTR) != 0)
726 control |= CONTROL_DTR_HIGH;
727 if ((clear & TIOCM_RTS) != 0)
728 control &= ~CONTROL_RTS_HIGH;
729 if ((clear & TIOCM_DTR) != 0)
730 control &= ~CONTROL_DTR_HIGH;
731
732 if (control != priv->pending_setup.control) {
733 priv->pending_setup.control = control;
734 }
735 spin_unlock_irqrestore(&priv->lock, flags);
736
737 return 0;
738 }
739
740 static int oti6858_tiocmget(struct usb_serial_port *port, struct file *file)
741 {
742 struct oti6858_private *priv = usb_get_serial_port_data(port);
743 unsigned long flags;
744 unsigned pin_state;
745 unsigned result = 0;
746
747 dbg("%s(port = %d)", __FUNCTION__, port->number);
748
749 if (!usb_get_intfdata(port->serial->interface))
750 return -ENODEV;
751
752 spin_lock_irqsave(&priv->lock, flags);
753 pin_state = priv->status.pin_state & PIN_MASK;
754 spin_unlock_irqrestore(&priv->lock, flags);
755
756 /* FIXME: check if this is correct (active high/low) */
757 if ((pin_state & PIN_RTS) != 0)
758 result |= TIOCM_RTS;
759 if ((pin_state & PIN_CTS) != 0)
760 result |= TIOCM_CTS;
761 if ((pin_state & PIN_DSR) != 0)
762 result |= TIOCM_DSR;
763 if ((pin_state & PIN_DTR) != 0)
764 result |= TIOCM_DTR;
765 if ((pin_state & PIN_RI) != 0)
766 result |= TIOCM_RI;
767 if ((pin_state & PIN_DCD) != 0)
768 result |= TIOCM_CD;
769
770 dbg("%s() = 0x%08x", __FUNCTION__, result);
771
772 return result;
773 }
774
775 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
776 {
777 struct oti6858_private *priv = usb_get_serial_port_data(port);
778 unsigned long flags;
779 unsigned int prev, status;
780 unsigned int changed;
781
782 spin_lock_irqsave(&priv->lock, flags);
783 prev = priv->status.pin_state;
784 spin_unlock_irqrestore(&priv->lock, flags);
785
786 while (1) {
787 wait_event_interruptible(priv->intr_wait, priv->status.pin_state != prev);
788 if (signal_pending(current))
789 return -ERESTARTSYS;
790
791 spin_lock_irqsave(&priv->lock, flags);
792 status = priv->status.pin_state & PIN_MASK;
793 spin_unlock_irqrestore(&priv->lock, flags);
794
795 changed = prev ^ status;
796 /* FIXME: check if this is correct (active high/low) */
797 if ( ((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
798 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
799 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
800 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) {
801 return 0;
802 }
803 prev = status;
804 }
805
806 /* NOTREACHED */
807 return 0;
808 }
809
810 static int oti6858_ioctl(struct usb_serial_port *port, struct file *file,
811 unsigned int cmd, unsigned long arg)
812 {
813 void __user *user_arg = (void __user *) arg;
814 unsigned int x;
815
816 dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)",
817 __FUNCTION__, port->number, cmd, arg);
818
819 switch (cmd) {
820 case TCGETS:
821 if (copy_to_user(user_arg, port->tty->termios,
822 sizeof(struct ktermios))) {
823 return -EFAULT;
824 }
825 return 0;
826
827 case TCSETS:
828 case TCSETSW: /* FIXME: this is not the same! */
829 case TCSETSF: /* FIXME: this is not the same! */
830 if (copy_from_user(port->tty->termios, user_arg,
831 sizeof(struct ktermios))) {
832 return -EFAULT;
833 }
834 oti6858_set_termios(port, NULL);
835 return 0;
836
837 case TCFLSH:
838 /* FIXME */
839 return 0;
840
841 case TIOCMBIS:
842 if (copy_from_user(&x, user_arg, sizeof(x)))
843 return -EFAULT;
844 return oti6858_tiocmset(port, NULL, x, 0);
845
846 case TIOCMBIC:
847 if (copy_from_user(&x, user_arg, sizeof(x)))
848 return -EFAULT;
849 return oti6858_tiocmset(port, NULL, 0, x);
850
851 case TIOCGSERIAL:
852 if (copy_to_user(user_arg, port->tty->termios,
853 sizeof(struct ktermios))) {
854 return -EFAULT;
855 }
856 return 0;
857
858 case TIOCSSERIAL:
859 if (copy_from_user(port->tty->termios, user_arg,
860 sizeof(struct ktermios))) {
861 return -EFAULT;
862 }
863 oti6858_set_termios(port, NULL);
864 return 0;
865
866 case TIOCMIWAIT:
867 dbg("%s(): TIOCMIWAIT", __FUNCTION__);
868 return wait_modem_info(port, arg);
869
870 default:
871 dbg("%s(): 0x%04x not supported", __FUNCTION__, cmd);
872 break;
873 }
874
875 return -ENOIOCTLCMD;
876 }
877
878 static void oti6858_break_ctl(struct usb_serial_port *port, int break_state)
879 {
880 int state;
881
882 dbg("%s(port = %d)", __FUNCTION__, port->number);
883
884 state = (break_state == 0) ? 0 : 1;
885 dbg("%s(): turning break %s", __FUNCTION__, state ? "on" : "off");
886
887 /* FIXME */
888 /*
889 result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
890 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
891 0, NULL, 0, 100);
892 if (result != 0)
893 dbg("%s(): error sending break", __FUNCTION__);
894 */
895 }
896
897 static void oti6858_shutdown(struct usb_serial *serial)
898 {
899 struct oti6858_private *priv;
900 int i;
901
902 dbg("%s()", __FUNCTION__);
903
904 for (i = 0; i < serial->num_ports; ++i) {
905 priv = usb_get_serial_port_data(serial->port[i]);
906 if (priv) {
907 pl2303_buf_free(priv->buf);
908 kfree(priv);
909 usb_set_serial_port_data(serial->port[i], NULL);
910 }
911 }
912 }
913
914 static void oti6858_read_int_callback(struct urb *urb)
915 {
916 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
917 struct oti6858_private *priv = usb_get_serial_port_data(port);
918 int transient = 0, can_recv = 0, resubmit = 1;
919 int status = urb->status;
920
921 dbg("%s(port = %d, status = %d)",
922 __FUNCTION__, port->number, status);
923
924 switch (status) {
925 case 0:
926 /* success */
927 break;
928 case -ECONNRESET:
929 case -ENOENT:
930 case -ESHUTDOWN:
931 /* this urb is terminated, clean up */
932 dbg("%s(): urb shutting down with status: %d",
933 __FUNCTION__, status);
934 return;
935 default:
936 dbg("%s(): nonzero urb status received: %d",
937 __FUNCTION__, status);
938 break;
939 }
940
941 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
942 struct oti6858_control_pkt *xs = urb->transfer_buffer;
943 unsigned long flags;
944
945 spin_lock_irqsave(&priv->lock, flags);
946
947 if (!priv->transient) {
948 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
949 if (xs->rx_bytes_avail == 0) {
950 priv->transient = 4;
951 priv->setup_done = 0;
952 resubmit = 0;
953 dbg("%s(): scheduling setup_line()",
954 __FUNCTION__);
955 schedule_delayed_work(&priv->delayed_setup_work, 0);
956 }
957 }
958 } else {
959 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
960 priv->transient = 0;
961 } else if (!priv->setup_done) {
962 resubmit = 0;
963 } else if (--priv->transient == 0) {
964 if (xs->rx_bytes_avail == 0) {
965 priv->transient = 4;
966 priv->setup_done = 0;
967 resubmit = 0;
968 dbg("%s(): scheduling setup_line()",
969 __FUNCTION__);
970 schedule_delayed_work(&priv->delayed_setup_work, 0);
971 }
972 }
973 }
974
975 if (!priv->transient) {
976 if (xs->pin_state != priv->status.pin_state)
977 wake_up_interruptible(&priv->intr_wait);
978 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
979 }
980
981 if (!priv->transient && xs->rx_bytes_avail != 0) {
982 can_recv = xs->rx_bytes_avail;
983 priv->flags.read_urb_in_use = 1;
984 }
985
986 transient = priv->transient;
987 spin_unlock_irqrestore(&priv->lock, flags);
988 }
989
990 if (can_recv) {
991 int result;
992
993 port->read_urb->dev = port->serial->dev;
994 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
995 if (result != 0) {
996 priv->flags.read_urb_in_use = 0;
997 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
998 " error %d\n", __FUNCTION__, result);
999 } else {
1000 resubmit = 0;
1001 }
1002 } else if (!transient) {
1003 unsigned long flags;
1004
1005 spin_lock_irqsave(&priv->lock, flags);
1006 if (priv->flags.write_urb_in_use == 0
1007 && pl2303_buf_data_avail(priv->buf) != 0) {
1008 schedule_delayed_work(&priv->delayed_write_work,0);
1009 resubmit = 0;
1010 }
1011 spin_unlock_irqrestore(&priv->lock, flags);
1012 }
1013
1014 if (resubmit) {
1015 int result;
1016
1017 // dbg("%s(): submitting interrupt urb", __FUNCTION__);
1018 urb->dev = port->serial->dev;
1019 result = usb_submit_urb(urb, GFP_ATOMIC);
1020 if (result != 0) {
1021 dev_err(&urb->dev->dev,
1022 "%s(): usb_submit_urb() failed with"
1023 " error %d\n", __FUNCTION__, result);
1024 }
1025 }
1026 }
1027
1028 static void oti6858_read_bulk_callback(struct urb *urb)
1029 {
1030 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
1031 struct oti6858_private *priv = usb_get_serial_port_data(port);
1032 struct tty_struct *tty;
1033 unsigned char *data = urb->transfer_buffer;
1034 unsigned long flags;
1035 int i, result;
1036 int status = urb->status;
1037 char tty_flag;
1038
1039 dbg("%s(port = %d, status = %d)",
1040 __FUNCTION__, port->number, status);
1041
1042 spin_lock_irqsave(&priv->lock, flags);
1043 priv->flags.read_urb_in_use = 0;
1044 spin_unlock_irqrestore(&priv->lock, flags);
1045
1046 if (status != 0) {
1047 if (!port->open_count) {
1048 dbg("%s(): port is closed, exiting", __FUNCTION__);
1049 return;
1050 }
1051 /*
1052 if (status == -EPROTO) {
1053 // PL2303 mysteriously fails with -EPROTO reschedule the read
1054 dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
1055 result = usb_submit_urb(urb, GFP_ATOMIC);
1056 if (result)
1057 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
1058 return;
1059 }
1060 */
1061 dbg("%s(): unable to handle the error, exiting", __FUNCTION__);
1062 return;
1063 }
1064
1065 // get tty_flag from status
1066 tty_flag = TTY_NORMAL;
1067
1068 /* FIXME: probably, errors will be signalled using interrupt pipe! */
1069 /*
1070 // break takes precedence over parity,
1071 // which takes precedence over framing errors
1072 if (status & UART_BREAK_ERROR )
1073 tty_flag = TTY_BREAK;
1074 else if (status & UART_PARITY_ERROR)
1075 tty_flag = TTY_PARITY;
1076 else if (status & UART_FRAME_ERROR)
1077 tty_flag = TTY_FRAME;
1078 dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
1079 */
1080
1081 tty = port->tty;
1082 if (tty != NULL && urb->actual_length > 0) {
1083 tty_buffer_request_room(tty, urb->actual_length);
1084 for (i = 0; i < urb->actual_length; ++i)
1085 tty_insert_flip_char(tty, data[i], tty_flag);
1086 tty_flip_buffer_push(tty);
1087 }
1088
1089 // schedule the interrupt urb if we are still open */
1090 if (port->open_count != 0) {
1091 port->interrupt_in_urb->dev = port->serial->dev;
1092 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1093 if (result != 0) {
1094 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
1095 " error %d\n", __FUNCTION__, result);
1096 }
1097 }
1098 }
1099
1100 static void oti6858_write_bulk_callback(struct urb *urb)
1101 {
1102 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
1103 struct oti6858_private *priv = usb_get_serial_port_data(port);
1104 int status = urb->status;
1105 int result;
1106
1107 dbg("%s(port = %d, status = %d)",
1108 __FUNCTION__, port->number, status);
1109
1110 switch (status) {
1111 case 0:
1112 /* success */
1113 break;
1114 case -ECONNRESET:
1115 case -ENOENT:
1116 case -ESHUTDOWN:
1117 /* this urb is terminated, clean up */
1118 dbg("%s(): urb shutting down with status: %d",
1119 __FUNCTION__, status);
1120 priv->flags.write_urb_in_use = 0;
1121 return;
1122 default:
1123 /* error in the urb, so we have to resubmit it */
1124 dbg("%s(): nonzero write bulk status received: %d",
1125 __FUNCTION__, status);
1126 dbg("%s(): overflow in write", __FUNCTION__);
1127
1128 port->write_urb->transfer_buffer_length = 1;
1129 port->write_urb->dev = port->serial->dev;
1130 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1131 if (result) {
1132 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
1133 " error %d\n", __FUNCTION__, result);
1134 } else {
1135 return;
1136 }
1137 }
1138
1139 priv->flags.write_urb_in_use = 0;
1140
1141 // schedule the interrupt urb if we are still open */
1142 port->interrupt_in_urb->dev = port->serial->dev;
1143 dbg("%s(): submitting interrupt urb", __FUNCTION__);
1144 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1145 if (result != 0) {
1146 dev_err(&port->dev, "%s(): failed submitting int urb,"
1147 " error %d\n", __FUNCTION__, result);
1148 }
1149 }
1150
1151
1152 /*
1153 * pl2303_buf_alloc
1154 *
1155 * Allocate a circular buffer and all associated memory.
1156 */
1157 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
1158 {
1159 struct pl2303_buf *pb;
1160
1161 if (size == 0)
1162 return NULL;
1163
1164 pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1165 if (pb == NULL)
1166 return NULL;
1167
1168 pb->buf_buf = kmalloc(size, GFP_KERNEL);
1169 if (pb->buf_buf == NULL) {
1170 kfree(pb);
1171 return NULL;
1172 }
1173
1174 pb->buf_size = size;
1175 pb->buf_get = pb->buf_put = pb->buf_buf;
1176
1177 return pb;
1178 }
1179
1180 /*
1181 * pl2303_buf_free
1182 *
1183 * Free the buffer and all associated memory.
1184 */
1185 static void pl2303_buf_free(struct pl2303_buf *pb)
1186 {
1187 if (pb) {
1188 kfree(pb->buf_buf);
1189 kfree(pb);
1190 }
1191 }
1192
1193 /*
1194 * pl2303_buf_clear
1195 *
1196 * Clear out all data in the circular buffer.
1197 */
1198 static void pl2303_buf_clear(struct pl2303_buf *pb)
1199 {
1200 if (pb != NULL) {
1201 /* equivalent to a get of all data available */
1202 pb->buf_get = pb->buf_put;
1203 }
1204 }
1205
1206 /*
1207 * pl2303_buf_data_avail
1208 *
1209 * Return the number of bytes of data available in the circular
1210 * buffer.
1211 */
1212 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1213 {
1214 if (pb == NULL)
1215 return 0;
1216 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1217 }
1218
1219 /*
1220 * pl2303_buf_space_avail
1221 *
1222 * Return the number of bytes of space available in the circular
1223 * buffer.
1224 */
1225 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1226 {
1227 if (pb == NULL)
1228 return 0;
1229 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1230 }
1231
1232 /*
1233 * pl2303_buf_put
1234 *
1235 * Copy data data from a user buffer and put it into the circular buffer.
1236 * Restrict to the amount of space available.
1237 *
1238 * Return the number of bytes copied.
1239 */
1240 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1241 unsigned int count)
1242 {
1243 unsigned int len;
1244
1245 if (pb == NULL)
1246 return 0;
1247
1248 len = pl2303_buf_space_avail(pb);
1249 if (count > len)
1250 count = len;
1251
1252 if (count == 0)
1253 return 0;
1254
1255 len = pb->buf_buf + pb->buf_size - pb->buf_put;
1256 if (count > len) {
1257 memcpy(pb->buf_put, buf, len);
1258 memcpy(pb->buf_buf, buf+len, count - len);
1259 pb->buf_put = pb->buf_buf + count - len;
1260 } else {
1261 memcpy(pb->buf_put, buf, count);
1262 if (count < len)
1263 pb->buf_put += count;
1264 else /* count == len */
1265 pb->buf_put = pb->buf_buf;
1266 }
1267
1268 return count;
1269 }
1270
1271 /*
1272 * pl2303_buf_get
1273 *
1274 * Get data from the circular buffer and copy to the given buffer.
1275 * Restrict to the amount of data available.
1276 *
1277 * Return the number of bytes copied.
1278 */
1279 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1280 unsigned int count)
1281 {
1282 unsigned int len;
1283
1284 if (pb == NULL)
1285 return 0;
1286
1287 len = pl2303_buf_data_avail(pb);
1288 if (count > len)
1289 count = len;
1290
1291 if (count == 0)
1292 return 0;
1293
1294 len = pb->buf_buf + pb->buf_size - pb->buf_get;
1295 if (count > len) {
1296 memcpy(buf, pb->buf_get, len);
1297 memcpy(buf+len, pb->buf_buf, count - len);
1298 pb->buf_get = pb->buf_buf + count - len;
1299 } else {
1300 memcpy(buf, pb->buf_get, count);
1301 if (count < len)
1302 pb->buf_get += count;
1303 else /* count == len */
1304 pb->buf_get = pb->buf_buf;
1305 }
1306
1307 return count;
1308 }
1309
1310 /* module description and (de)initialization */
1311
1312 static int __init oti6858_init(void)
1313 {
1314 int retval;
1315
1316 if ((retval = usb_serial_register(&oti6858_device)) == 0) {
1317 if ((retval = usb_register(&oti6858_driver)) != 0)
1318 usb_serial_deregister(&oti6858_device);
1319 else
1320 return 0;
1321 }
1322
1323 return retval;
1324 }
1325
1326 static void __exit oti6858_exit(void)
1327 {
1328 usb_deregister(&oti6858_driver);
1329 usb_serial_deregister(&oti6858_device);
1330 }
1331
1332 module_init(oti6858_init);
1333 module_exit(oti6858_exit);
1334
1335 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
1336 MODULE_AUTHOR(OTI6858_AUTHOR);
1337 MODULE_VERSION(OTI6858_VERSION);
1338 MODULE_LICENSE("GPL");
1339
1340 module_param(debug, bool, S_IRUGO | S_IWUSR);
1341 MODULE_PARM_DESC(debug, "enable debug output");
1342
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree