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/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 <linux/uaccess.h>
53 #include <linux/kfifo.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
60 static const 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 /* requests */
68 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
69 #define OTI6858_REQ_T_GET_STATUS 0x01
70
71 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
72 #define OTI6858_REQ_T_SET_LINE 0x00
73
74 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
75 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
76
77 /* format of the control packet */
78 struct oti6858_control_pkt {
79 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
80 #define OTI6858_MAX_BAUD_RATE 3000000
81 u8 frame_fmt;
82 #define FMT_STOP_BITS_MASK 0xc0
83 #define FMT_STOP_BITS_1 0x00
84 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
85 #define FMT_PARITY_MASK 0x38
86 #define FMT_PARITY_NONE 0x00
87 #define FMT_PARITY_ODD 0x08
88 #define FMT_PARITY_EVEN 0x18
89 #define FMT_PARITY_MARK 0x28
90 #define FMT_PARITY_SPACE 0x38
91 #define FMT_DATA_BITS_MASK 0x03
92 #define FMT_DATA_BITS_5 0x00
93 #define FMT_DATA_BITS_6 0x01
94 #define FMT_DATA_BITS_7 0x02
95 #define FMT_DATA_BITS_8 0x03
96 u8 something; /* always equals 0x43 */
97 u8 control; /* settings of flow control lines */
98 #define CONTROL_MASK 0x0c
99 #define CONTROL_DTR_HIGH 0x08
100 #define CONTROL_RTS_HIGH 0x04
101 u8 tx_status;
102 #define TX_BUFFER_EMPTIED 0x09
103 u8 pin_state;
104 #define PIN_MASK 0x3f
105 #define PIN_MSR_MASK 0x1b
106 #define PIN_RTS 0x20 /* output pin */
107 #define PIN_CTS 0x10 /* input pin, active low */
108 #define PIN_DSR 0x08 /* input pin, active low */
109 #define PIN_DTR 0x04 /* output pin */
110 #define PIN_RI 0x02 /* input pin, active low */
111 #define PIN_DCD 0x01 /* input pin, active low */
112 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
113 };
114
115 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
116 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
117 (((a)->divisor == (priv)->pending_setup.divisor) \
118 && ((a)->control == (priv)->pending_setup.control) \
119 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
120
121 /* function prototypes */
122 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
123 static void oti6858_close(struct usb_serial_port *port);
124 static void oti6858_set_termios(struct tty_struct *tty,
125 struct usb_serial_port *port, struct ktermios *old);
126 static void oti6858_init_termios(struct tty_struct *tty);
127 static void oti6858_read_int_callback(struct urb *urb);
128 static void oti6858_read_bulk_callback(struct urb *urb);
129 static void oti6858_write_bulk_callback(struct urb *urb);
130 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
131 const unsigned char *buf, int count);
132 static int oti6858_write_room(struct tty_struct *tty);
133 static int oti6858_chars_in_buffer(struct tty_struct *tty);
134 static int oti6858_tiocmget(struct tty_struct *tty);
135 static int oti6858_tiocmset(struct tty_struct *tty,
136 unsigned int set, unsigned int clear);
137 static int oti6858_attach(struct usb_serial *serial);
138 static int oti6858_port_probe(struct usb_serial_port *port);
139 static int oti6858_port_remove(struct usb_serial_port *port);
140
141 /* device info */
142 static struct usb_serial_driver oti6858_device = {
143 .driver = {
144 .owner = THIS_MODULE,
145 .name = "oti6858",
146 },
147 .id_table = id_table,
148 .num_ports = 1,
149 .open = oti6858_open,
150 .close = oti6858_close,
151 .write = oti6858_write,
152 .set_termios = oti6858_set_termios,
153 .init_termios = oti6858_init_termios,
154 .tiocmget = oti6858_tiocmget,
155 .tiocmset = oti6858_tiocmset,
156 .tiocmiwait = usb_serial_generic_tiocmiwait,
157 .read_bulk_callback = oti6858_read_bulk_callback,
158 .read_int_callback = oti6858_read_int_callback,
159 .write_bulk_callback = oti6858_write_bulk_callback,
160 .write_room = oti6858_write_room,
161 .chars_in_buffer = oti6858_chars_in_buffer,
162 .attach = oti6858_attach,
163 .port_probe = oti6858_port_probe,
164 .port_remove = oti6858_port_remove,
165 };
166
167 static struct usb_serial_driver * const serial_drivers[] = {
168 &oti6858_device, NULL
169 };
170
171 struct oti6858_private {
172 spinlock_t lock;
173
174 struct oti6858_control_pkt status;
175
176 struct {
177 u8 read_urb_in_use;
178 u8 write_urb_in_use;
179 } flags;
180 struct delayed_work delayed_write_work;
181
182 struct {
183 __le16 divisor;
184 u8 frame_fmt;
185 u8 control;
186 } pending_setup;
187 u8 transient;
188 u8 setup_done;
189 struct delayed_work delayed_setup_work;
190
191 struct usb_serial_port *port; /* USB port with which associated */
192 };
193
setup_line(struct work_struct * work)194 static void setup_line(struct work_struct *work)
195 {
196 struct oti6858_private *priv = container_of(work,
197 struct oti6858_private, delayed_setup_work.work);
198 struct usb_serial_port *port = priv->port;
199 struct oti6858_control_pkt *new_setup;
200 unsigned long flags;
201 int result;
202
203 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
204 if (!new_setup) {
205 /* we will try again */
206 schedule_delayed_work(&priv->delayed_setup_work,
207 msecs_to_jiffies(2));
208 return;
209 }
210
211 result = usb_control_msg(port->serial->dev,
212 usb_rcvctrlpipe(port->serial->dev, 0),
213 OTI6858_REQ_T_GET_STATUS,
214 OTI6858_REQ_GET_STATUS,
215 0, 0,
216 new_setup, OTI6858_CTRL_PKT_SIZE,
217 100);
218
219 if (result != OTI6858_CTRL_PKT_SIZE) {
220 dev_err(&port->dev, "%s(): error reading status\n", __func__);
221 kfree(new_setup);
222 /* we will try again */
223 schedule_delayed_work(&priv->delayed_setup_work,
224 msecs_to_jiffies(2));
225 return;
226 }
227
228 spin_lock_irqsave(&priv->lock, flags);
229 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
230 new_setup->divisor = priv->pending_setup.divisor;
231 new_setup->control = priv->pending_setup.control;
232 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
233
234 spin_unlock_irqrestore(&priv->lock, flags);
235 result = usb_control_msg(port->serial->dev,
236 usb_sndctrlpipe(port->serial->dev, 0),
237 OTI6858_REQ_T_SET_LINE,
238 OTI6858_REQ_SET_LINE,
239 0, 0,
240 new_setup, OTI6858_CTRL_PKT_SIZE,
241 100);
242 } else {
243 spin_unlock_irqrestore(&priv->lock, flags);
244 result = 0;
245 }
246 kfree(new_setup);
247
248 spin_lock_irqsave(&priv->lock, flags);
249 if (result != OTI6858_CTRL_PKT_SIZE)
250 priv->transient = 0;
251 priv->setup_done = 1;
252 spin_unlock_irqrestore(&priv->lock, flags);
253
254 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
255 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
256 if (result != 0) {
257 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
258 __func__, result);
259 }
260 }
261
send_data(struct work_struct * work)262 static void send_data(struct work_struct *work)
263 {
264 struct oti6858_private *priv = container_of(work,
265 struct oti6858_private, delayed_write_work.work);
266 struct usb_serial_port *port = priv->port;
267 int count = 0, result;
268 unsigned long flags;
269 u8 *allow;
270
271 spin_lock_irqsave(&priv->lock, flags);
272 if (priv->flags.write_urb_in_use) {
273 spin_unlock_irqrestore(&priv->lock, flags);
274 schedule_delayed_work(&priv->delayed_write_work,
275 msecs_to_jiffies(2));
276 return;
277 }
278 priv->flags.write_urb_in_use = 1;
279 spin_unlock_irqrestore(&priv->lock, flags);
280
281 spin_lock_irqsave(&port->lock, flags);
282 count = kfifo_len(&port->write_fifo);
283 spin_unlock_irqrestore(&port->lock, flags);
284
285 if (count > port->bulk_out_size)
286 count = port->bulk_out_size;
287
288 if (count != 0) {
289 allow = kmalloc(1, GFP_KERNEL);
290 if (!allow)
291 return;
292
293 result = usb_control_msg(port->serial->dev,
294 usb_rcvctrlpipe(port->serial->dev, 0),
295 OTI6858_REQ_T_CHECK_TXBUFF,
296 OTI6858_REQ_CHECK_TXBUFF,
297 count, 0, allow, 1, 100);
298 if (result != 1 || *allow != 0)
299 count = 0;
300 kfree(allow);
301 }
302
303 if (count == 0) {
304 priv->flags.write_urb_in_use = 0;
305
306 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
307 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
308 if (result != 0) {
309 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
310 __func__, result);
311 }
312 return;
313 }
314
315 count = kfifo_out_locked(&port->write_fifo,
316 port->write_urb->transfer_buffer,
317 count, &port->lock);
318 port->write_urb->transfer_buffer_length = count;
319 result = usb_submit_urb(port->write_urb, GFP_NOIO);
320 if (result != 0) {
321 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
322 __func__, result);
323 priv->flags.write_urb_in_use = 0;
324 }
325
326 usb_serial_port_softint(port);
327 }
328
oti6858_attach(struct usb_serial * serial)329 static int oti6858_attach(struct usb_serial *serial)
330 {
331 unsigned char num_ports = serial->num_ports;
332
333 if (serial->num_bulk_in < num_ports ||
334 serial->num_bulk_out < num_ports ||
335 serial->num_interrupt_in < num_ports) {
336 dev_err(&serial->interface->dev, "missing endpoints\n");
337 return -ENODEV;
338 }
339
340 return 0;
341 }
342
oti6858_port_probe(struct usb_serial_port * port)343 static int oti6858_port_probe(struct usb_serial_port *port)
344 {
345 struct oti6858_private *priv;
346
347 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
348 if (!priv)
349 return -ENOMEM;
350
351 spin_lock_init(&priv->lock);
352 priv->port = port;
353 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
354 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
355
356 usb_set_serial_port_data(port, priv);
357
358 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
359
360 return 0;
361 }
362
oti6858_port_remove(struct usb_serial_port * port)363 static int oti6858_port_remove(struct usb_serial_port *port)
364 {
365 struct oti6858_private *priv;
366
367 priv = usb_get_serial_port_data(port);
368 kfree(priv);
369
370 return 0;
371 }
372
oti6858_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)373 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
374 const unsigned char *buf, int count)
375 {
376 if (!count)
377 return count;
378
379 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
380
381 return count;
382 }
383
oti6858_write_room(struct tty_struct * tty)384 static int oti6858_write_room(struct tty_struct *tty)
385 {
386 struct usb_serial_port *port = tty->driver_data;
387 int room = 0;
388 unsigned long flags;
389
390 spin_lock_irqsave(&port->lock, flags);
391 room = kfifo_avail(&port->write_fifo);
392 spin_unlock_irqrestore(&port->lock, flags);
393
394 return room;
395 }
396
oti6858_chars_in_buffer(struct tty_struct * tty)397 static int oti6858_chars_in_buffer(struct tty_struct *tty)
398 {
399 struct usb_serial_port *port = tty->driver_data;
400 int chars = 0;
401 unsigned long flags;
402
403 spin_lock_irqsave(&port->lock, flags);
404 chars = kfifo_len(&port->write_fifo);
405 spin_unlock_irqrestore(&port->lock, flags);
406
407 return chars;
408 }
409
oti6858_init_termios(struct tty_struct * tty)410 static void oti6858_init_termios(struct tty_struct *tty)
411 {
412 tty->termios = tty_std_termios;
413 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
414 tty->termios.c_ispeed = 38400;
415 tty->termios.c_ospeed = 38400;
416 }
417
oti6858_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)418 static void oti6858_set_termios(struct tty_struct *tty,
419 struct usb_serial_port *port, struct ktermios *old_termios)
420 {
421 struct oti6858_private *priv = usb_get_serial_port_data(port);
422 unsigned long flags;
423 unsigned int cflag;
424 u8 frame_fmt, control;
425 __le16 divisor;
426 int br;
427
428 cflag = tty->termios.c_cflag;
429
430 spin_lock_irqsave(&priv->lock, flags);
431 divisor = priv->pending_setup.divisor;
432 frame_fmt = priv->pending_setup.frame_fmt;
433 control = priv->pending_setup.control;
434 spin_unlock_irqrestore(&priv->lock, flags);
435
436 frame_fmt &= ~FMT_DATA_BITS_MASK;
437 switch (cflag & CSIZE) {
438 case CS5:
439 frame_fmt |= FMT_DATA_BITS_5;
440 break;
441 case CS6:
442 frame_fmt |= FMT_DATA_BITS_6;
443 break;
444 case CS7:
445 frame_fmt |= FMT_DATA_BITS_7;
446 break;
447 default:
448 case CS8:
449 frame_fmt |= FMT_DATA_BITS_8;
450 break;
451 }
452
453 /* manufacturer claims that this device can work with baud rates
454 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
455 * guarantee that any other baud rate will work (especially
456 * the higher ones)
457 */
458 br = tty_get_baud_rate(tty);
459 if (br == 0) {
460 divisor = 0;
461 } else {
462 int real_br;
463 int new_divisor;
464 br = min(br, OTI6858_MAX_BAUD_RATE);
465
466 new_divisor = (96000000 + 8 * br) / (16 * br);
467 real_br = 96000000 / (16 * new_divisor);
468 divisor = cpu_to_le16(new_divisor);
469 tty_encode_baud_rate(tty, real_br, real_br);
470 }
471
472 frame_fmt &= ~FMT_STOP_BITS_MASK;
473 if ((cflag & CSTOPB) != 0)
474 frame_fmt |= FMT_STOP_BITS_2;
475 else
476 frame_fmt |= FMT_STOP_BITS_1;
477
478 frame_fmt &= ~FMT_PARITY_MASK;
479 if ((cflag & PARENB) != 0) {
480 if ((cflag & PARODD) != 0)
481 frame_fmt |= FMT_PARITY_ODD;
482 else
483 frame_fmt |= FMT_PARITY_EVEN;
484 } else {
485 frame_fmt |= FMT_PARITY_NONE;
486 }
487
488 control &= ~CONTROL_MASK;
489 if ((cflag & CRTSCTS) != 0)
490 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
491
492 /* change control lines if we are switching to or from B0 */
493 /* FIXME:
494 spin_lock_irqsave(&priv->lock, flags);
495 control = priv->line_control;
496 if ((cflag & CBAUD) == B0)
497 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
498 else
499 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
500 if (control != priv->line_control) {
501 control = priv->line_control;
502 spin_unlock_irqrestore(&priv->lock, flags);
503 set_control_lines(serial->dev, control);
504 } else {
505 spin_unlock_irqrestore(&priv->lock, flags);
506 }
507 */
508
509 spin_lock_irqsave(&priv->lock, flags);
510 if (divisor != priv->pending_setup.divisor
511 || control != priv->pending_setup.control
512 || frame_fmt != priv->pending_setup.frame_fmt) {
513 priv->pending_setup.divisor = divisor;
514 priv->pending_setup.control = control;
515 priv->pending_setup.frame_fmt = frame_fmt;
516 }
517 spin_unlock_irqrestore(&priv->lock, flags);
518 }
519
oti6858_open(struct tty_struct * tty,struct usb_serial_port * port)520 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
521 {
522 struct oti6858_private *priv = usb_get_serial_port_data(port);
523 struct usb_serial *serial = port->serial;
524 struct oti6858_control_pkt *buf;
525 unsigned long flags;
526 int result;
527
528 usb_clear_halt(serial->dev, port->write_urb->pipe);
529 usb_clear_halt(serial->dev, port->read_urb->pipe);
530
531 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
532 if (!buf)
533 return -ENOMEM;
534
535 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
536 OTI6858_REQ_T_GET_STATUS,
537 OTI6858_REQ_GET_STATUS,
538 0, 0,
539 buf, OTI6858_CTRL_PKT_SIZE,
540 100);
541 if (result != OTI6858_CTRL_PKT_SIZE) {
542 /* assume default (after power-on reset) values */
543 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
544 buf->frame_fmt = 0x03; /* 8N1 */
545 buf->something = 0x43;
546 buf->control = 0x4c; /* DTR, RTS */
547 buf->tx_status = 0x00;
548 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
549 buf->rx_bytes_avail = 0x00;
550 }
551
552 spin_lock_irqsave(&priv->lock, flags);
553 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
554 priv->pending_setup.divisor = buf->divisor;
555 priv->pending_setup.frame_fmt = buf->frame_fmt;
556 priv->pending_setup.control = buf->control;
557 spin_unlock_irqrestore(&priv->lock, flags);
558 kfree(buf);
559
560 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
561 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
562 if (result != 0) {
563 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
564 __func__, result);
565 oti6858_close(port);
566 return result;
567 }
568
569 /* setup termios */
570 if (tty)
571 oti6858_set_termios(tty, port, NULL);
572
573 return 0;
574 }
575
oti6858_close(struct usb_serial_port * port)576 static void oti6858_close(struct usb_serial_port *port)
577 {
578 struct oti6858_private *priv = usb_get_serial_port_data(port);
579 unsigned long flags;
580
581 spin_lock_irqsave(&port->lock, flags);
582 /* clear out any remaining data in the buffer */
583 kfifo_reset_out(&port->write_fifo);
584 spin_unlock_irqrestore(&port->lock, flags);
585
586 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
587
588 /* cancel scheduled setup */
589 cancel_delayed_work_sync(&priv->delayed_setup_work);
590 cancel_delayed_work_sync(&priv->delayed_write_work);
591
592 /* shutdown our urbs */
593 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
594 usb_kill_urb(port->write_urb);
595 usb_kill_urb(port->read_urb);
596 usb_kill_urb(port->interrupt_in_urb);
597 }
598
oti6858_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)599 static int oti6858_tiocmset(struct tty_struct *tty,
600 unsigned int set, unsigned int clear)
601 {
602 struct usb_serial_port *port = tty->driver_data;
603 struct oti6858_private *priv = usb_get_serial_port_data(port);
604 unsigned long flags;
605 u8 control;
606
607 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
608 __func__, set, clear);
609
610 /* FIXME: check if this is correct (active high/low) */
611 spin_lock_irqsave(&priv->lock, flags);
612 control = priv->pending_setup.control;
613 if ((set & TIOCM_RTS) != 0)
614 control |= CONTROL_RTS_HIGH;
615 if ((set & TIOCM_DTR) != 0)
616 control |= CONTROL_DTR_HIGH;
617 if ((clear & TIOCM_RTS) != 0)
618 control &= ~CONTROL_RTS_HIGH;
619 if ((clear & TIOCM_DTR) != 0)
620 control &= ~CONTROL_DTR_HIGH;
621
622 if (control != priv->pending_setup.control)
623 priv->pending_setup.control = control;
624
625 spin_unlock_irqrestore(&priv->lock, flags);
626 return 0;
627 }
628
oti6858_tiocmget(struct tty_struct * tty)629 static int oti6858_tiocmget(struct tty_struct *tty)
630 {
631 struct usb_serial_port *port = tty->driver_data;
632 struct oti6858_private *priv = usb_get_serial_port_data(port);
633 unsigned long flags;
634 unsigned pin_state;
635 unsigned result = 0;
636
637 spin_lock_irqsave(&priv->lock, flags);
638 pin_state = priv->status.pin_state & PIN_MASK;
639 spin_unlock_irqrestore(&priv->lock, flags);
640
641 /* FIXME: check if this is correct (active high/low) */
642 if ((pin_state & PIN_RTS) != 0)
643 result |= TIOCM_RTS;
644 if ((pin_state & PIN_CTS) != 0)
645 result |= TIOCM_CTS;
646 if ((pin_state & PIN_DSR) != 0)
647 result |= TIOCM_DSR;
648 if ((pin_state & PIN_DTR) != 0)
649 result |= TIOCM_DTR;
650 if ((pin_state & PIN_RI) != 0)
651 result |= TIOCM_RI;
652 if ((pin_state & PIN_DCD) != 0)
653 result |= TIOCM_CD;
654
655 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
656
657 return result;
658 }
659
oti6858_read_int_callback(struct urb * urb)660 static void oti6858_read_int_callback(struct urb *urb)
661 {
662 struct usb_serial_port *port = urb->context;
663 struct oti6858_private *priv = usb_get_serial_port_data(port);
664 int transient = 0, can_recv = 0, resubmit = 1;
665 int status = urb->status;
666
667 switch (status) {
668 case 0:
669 /* success */
670 break;
671 case -ECONNRESET:
672 case -ENOENT:
673 case -ESHUTDOWN:
674 /* this urb is terminated, clean up */
675 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
676 __func__, status);
677 return;
678 default:
679 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
680 __func__, status);
681 break;
682 }
683
684 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
685 struct oti6858_control_pkt *xs = urb->transfer_buffer;
686 unsigned long flags;
687
688 spin_lock_irqsave(&priv->lock, flags);
689
690 if (!priv->transient) {
691 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
692 if (xs->rx_bytes_avail == 0) {
693 priv->transient = 4;
694 priv->setup_done = 0;
695 resubmit = 0;
696 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
697 schedule_delayed_work(&priv->delayed_setup_work, 0);
698 }
699 }
700 } else {
701 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
702 priv->transient = 0;
703 } else if (!priv->setup_done) {
704 resubmit = 0;
705 } else if (--priv->transient == 0) {
706 if (xs->rx_bytes_avail == 0) {
707 priv->transient = 4;
708 priv->setup_done = 0;
709 resubmit = 0;
710 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
711 schedule_delayed_work(&priv->delayed_setup_work, 0);
712 }
713 }
714 }
715
716 if (!priv->transient) {
717 u8 delta = xs->pin_state ^ priv->status.pin_state;
718
719 if (delta & PIN_MSR_MASK) {
720 if (delta & PIN_CTS)
721 port->icount.cts++;
722 if (delta & PIN_DSR)
723 port->icount.dsr++;
724 if (delta & PIN_RI)
725 port->icount.rng++;
726 if (delta & PIN_DCD)
727 port->icount.dcd++;
728
729 wake_up_interruptible(&port->port.delta_msr_wait);
730 }
731
732 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
733 }
734
735 if (!priv->transient && xs->rx_bytes_avail != 0) {
736 can_recv = xs->rx_bytes_avail;
737 priv->flags.read_urb_in_use = 1;
738 }
739
740 transient = priv->transient;
741 spin_unlock_irqrestore(&priv->lock, flags);
742 }
743
744 if (can_recv) {
745 int result;
746
747 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
748 if (result != 0) {
749 priv->flags.read_urb_in_use = 0;
750 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
751 " error %d\n", __func__, result);
752 } else {
753 resubmit = 0;
754 }
755 } else if (!transient) {
756 unsigned long flags;
757 int count;
758
759 spin_lock_irqsave(&port->lock, flags);
760 count = kfifo_len(&port->write_fifo);
761 spin_unlock_irqrestore(&port->lock, flags);
762
763 spin_lock_irqsave(&priv->lock, flags);
764 if (priv->flags.write_urb_in_use == 0 && count != 0) {
765 schedule_delayed_work(&priv->delayed_write_work, 0);
766 resubmit = 0;
767 }
768 spin_unlock_irqrestore(&priv->lock, flags);
769 }
770
771 if (resubmit) {
772 int result;
773
774 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
775 result = usb_submit_urb(urb, GFP_ATOMIC);
776 if (result != 0) {
777 dev_err(&urb->dev->dev,
778 "%s(): usb_submit_urb() failed with"
779 " error %d\n", __func__, result);
780 }
781 }
782 }
783
oti6858_read_bulk_callback(struct urb * urb)784 static void oti6858_read_bulk_callback(struct urb *urb)
785 {
786 struct usb_serial_port *port = urb->context;
787 struct oti6858_private *priv = usb_get_serial_port_data(port);
788 unsigned char *data = urb->transfer_buffer;
789 unsigned long flags;
790 int status = urb->status;
791 int result;
792
793 spin_lock_irqsave(&priv->lock, flags);
794 priv->flags.read_urb_in_use = 0;
795 spin_unlock_irqrestore(&priv->lock, flags);
796
797 if (status != 0) {
798 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
799 return;
800 }
801
802 if (urb->actual_length > 0) {
803 tty_insert_flip_string(&port->port, data, urb->actual_length);
804 tty_flip_buffer_push(&port->port);
805 }
806
807 /* schedule the interrupt urb */
808 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
809 if (result != 0 && result != -EPERM) {
810 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
811 " error %d\n", __func__, result);
812 }
813 }
814
oti6858_write_bulk_callback(struct urb * urb)815 static void oti6858_write_bulk_callback(struct urb *urb)
816 {
817 struct usb_serial_port *port = urb->context;
818 struct oti6858_private *priv = usb_get_serial_port_data(port);
819 int status = urb->status;
820 int result;
821
822 switch (status) {
823 case 0:
824 /* success */
825 break;
826 case -ECONNRESET:
827 case -ENOENT:
828 case -ESHUTDOWN:
829 /* this urb is terminated, clean up */
830 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
831 priv->flags.write_urb_in_use = 0;
832 return;
833 default:
834 /* error in the urb, so we have to resubmit it */
835 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
836 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
837
838 port->write_urb->transfer_buffer_length = 1;
839 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
840 if (result) {
841 dev_err_console(port, "%s(): usb_submit_urb() failed,"
842 " error %d\n", __func__, result);
843 } else {
844 return;
845 }
846 }
847
848 priv->flags.write_urb_in_use = 0;
849
850 /* schedule the interrupt urb if we are still open */
851 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
852 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
853 if (result != 0) {
854 dev_err(&port->dev, "%s(): failed submitting int urb,"
855 " error %d\n", __func__, result);
856 }
857 }
858
859 module_usb_serial_driver(serial_drivers, id_table);
860
861 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
862 MODULE_AUTHOR(OTI6858_AUTHOR);
863 MODULE_LICENSE("GPL");
864