2 * Ours Technology Inc. OTi-6858 USB to serial adapter driver.
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.
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.
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
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
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.
28 * See Documentation/usb/usb-serial.txt for more information on using this
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
40 #include <linux/kernel.h>
41 #include <linux/errno.h>
42 #include <linux/init.h>
43 #include <linux/slab.h>
44 #include <linux/tty.h>
45 #include <linux/tty_driver.h>
46 #include <linux/tty_flip.h>
47 #include <linux/serial.h>
48 #include <linux/module.h>
49 #include <linux/moduleparam.h>
50 #include <linux/spinlock.h>
51 #include <linux/usb.h>
52 #include <linux/usb/serial.h>
53 #include <linux/uaccess.h>
54 #include <linux/kfifo.h>
57 #define OTI6858_DESCRIPTION \
58 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
59 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
60 #define OTI6858_VERSION "0.2"
62 static const struct usb_device_id id_table[] = {
63 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
67 MODULE_DEVICE_TABLE(usb, id_table);
69 static struct usb_driver oti6858_driver = {
71 .probe = usb_serial_probe,
72 .disconnect = usb_serial_disconnect,
79 #define OTI6858_FIFO_SIZE 1024
82 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
83 #define OTI6858_REQ_T_GET_STATUS 0x01
85 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
86 #define OTI6858_REQ_T_SET_LINE 0x00
88 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
89 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
91 /* format of the control packet */
92 struct oti6858_control_pkt {
93 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
94 #define OTI6858_MAX_BAUD_RATE 3000000
96 #define FMT_STOP_BITS_MASK 0xc0
97 #define FMT_STOP_BITS_1 0x00
98 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
99 #define FMT_PARITY_MASK 0x38
100 #define FMT_PARITY_NONE 0x00
101 #define FMT_PARITY_ODD 0x08
102 #define FMT_PARITY_EVEN 0x18
103 #define FMT_PARITY_MARK 0x28
104 #define FMT_PARITY_SPACE 0x38
105 #define FMT_DATA_BITS_MASK 0x03
106 #define FMT_DATA_BITS_5 0x00
107 #define FMT_DATA_BITS_6 0x01
108 #define FMT_DATA_BITS_7 0x02
109 #define FMT_DATA_BITS_8 0x03
110 u8 something; /* always equals 0x43 */
111 u8 control; /* settings of flow control lines */
112 #define CONTROL_MASK 0x0c
113 #define CONTROL_DTR_HIGH 0x08
114 #define CONTROL_RTS_HIGH 0x04
116 #define TX_BUFFER_EMPTIED 0x09
118 #define PIN_MASK 0x3f
119 #define PIN_RTS 0x20 /* output pin */
120 #define PIN_CTS 0x10 /* input pin, active low */
121 #define PIN_DSR 0x08 /* input pin, active low */
122 #define PIN_DTR 0x04 /* output pin */
123 #define PIN_RI 0x02 /* input pin, active low */
124 #define PIN_DCD 0x01 /* input pin, active low */
125 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
128 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
129 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
130 (((a)->divisor == (priv)->pending_setup.divisor) \
131 && ((a)->control == (priv)->pending_setup.control) \
132 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
134 /* function prototypes */
135 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
136 static void oti6858_close(struct usb_serial_port *port);
137 static void oti6858_set_termios(struct tty_struct *tty,
138 struct usb_serial_port *port, struct ktermios *old);
139 static void oti6858_init_termios(struct tty_struct *tty);
140 static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
141 unsigned int cmd, unsigned long arg);
142 static void oti6858_read_int_callback(struct urb *urb);
143 static void oti6858_read_bulk_callback(struct urb *urb);
144 static void oti6858_write_bulk_callback(struct urb *urb);
145 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
146 const unsigned char *buf, int count);
147 static int oti6858_write_room(struct tty_struct *tty);
148 static int oti6858_chars_in_buffer(struct tty_struct *tty);
149 static int oti6858_tiocmget(struct tty_struct *tty, struct file *file);
150 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
151 unsigned int set, unsigned int clear);
152 static int oti6858_startup(struct usb_serial *serial);
153 static void oti6858_release(struct usb_serial *serial);
156 static struct usb_serial_driver oti6858_device = {
158 .owner = THIS_MODULE,
161 .id_table = id_table,
163 .open = oti6858_open,
164 .close = oti6858_close,
165 .write = oti6858_write,
166 .ioctl = oti6858_ioctl,
167 .set_termios = oti6858_set_termios,
168 .init_termios = oti6858_init_termios,
169 .tiocmget = oti6858_tiocmget,
170 .tiocmset = oti6858_tiocmset,
171 .read_bulk_callback = oti6858_read_bulk_callback,
172 .read_int_callback = oti6858_read_int_callback,
173 .write_bulk_callback = oti6858_write_bulk_callback,
174 .write_room = oti6858_write_room,
175 .chars_in_buffer = oti6858_chars_in_buffer,
176 .attach = oti6858_startup,
177 .release = oti6858_release,
180 struct oti6858_private {
183 struct kfifo write_fifo;
184 struct oti6858_control_pkt status;
190 struct delayed_work delayed_write_work;
199 struct delayed_work delayed_setup_work;
201 wait_queue_head_t intr_wait;
202 struct usb_serial_port *port; /* USB port with which associated */
205 static void setup_line(struct work_struct *work)
207 struct oti6858_private *priv = container_of(work,
208 struct oti6858_private, delayed_setup_work.work);
209 struct usb_serial_port *port = priv->port;
210 struct oti6858_control_pkt *new_setup;
214 dbg("%s(port = %d)", __func__, port->number);
216 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
217 if (new_setup == NULL) {
218 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
219 /* we will try again */
220 schedule_delayed_work(&priv->delayed_setup_work,
221 msecs_to_jiffies(2));
225 result = usb_control_msg(port->serial->dev,
226 usb_rcvctrlpipe(port->serial->dev, 0),
227 OTI6858_REQ_T_GET_STATUS,
228 OTI6858_REQ_GET_STATUS,
230 new_setup, OTI6858_CTRL_PKT_SIZE,
233 if (result != OTI6858_CTRL_PKT_SIZE) {
234 dev_err(&port->dev, "%s(): error reading status\n", __func__);
236 /* we will try again */
237 schedule_delayed_work(&priv->delayed_setup_work,
238 msecs_to_jiffies(2));
242 spin_lock_irqsave(&priv->lock, flags);
243 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
244 new_setup->divisor = priv->pending_setup.divisor;
245 new_setup->control = priv->pending_setup.control;
246 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
248 spin_unlock_irqrestore(&priv->lock, flags);
249 result = usb_control_msg(port->serial->dev,
250 usb_sndctrlpipe(port->serial->dev, 0),
251 OTI6858_REQ_T_SET_LINE,
252 OTI6858_REQ_SET_LINE,
254 new_setup, OTI6858_CTRL_PKT_SIZE,
257 spin_unlock_irqrestore(&priv->lock, flags);
262 spin_lock_irqsave(&priv->lock, flags);
263 if (result != OTI6858_CTRL_PKT_SIZE)
265 priv->setup_done = 1;
266 spin_unlock_irqrestore(&priv->lock, flags);
268 dbg("%s(): submitting interrupt urb", __func__);
269 port->interrupt_in_urb->dev = port->serial->dev;
270 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
272 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
273 " with error %d\n", __func__, result);
277 static void send_data(struct work_struct *work)
279 struct oti6858_private *priv = container_of(work,
280 struct oti6858_private, delayed_write_work.work);
281 struct usb_serial_port *port = priv->port;
282 int count = 0, result;
286 dbg("%s(port = %d)", __func__, port->number);
288 spin_lock_irqsave(&priv->lock, flags);
289 if (priv->flags.write_urb_in_use) {
290 spin_unlock_irqrestore(&priv->lock, flags);
291 schedule_delayed_work(&priv->delayed_write_work,
292 msecs_to_jiffies(2));
295 priv->flags.write_urb_in_use = 1;
297 count = kfifo_len(&priv->write_fifo);
298 spin_unlock_irqrestore(&priv->lock, flags);
299 if (count > port->bulk_out_size)
300 count = port->bulk_out_size;
303 allow = kmalloc(1, GFP_KERNEL);
305 dev_err(&port->dev, "%s(): kmalloc failed\n",
309 result = usb_control_msg(port->serial->dev,
310 usb_rcvctrlpipe(port->serial->dev, 0),
311 OTI6858_REQ_T_CHECK_TXBUFF,
312 OTI6858_REQ_CHECK_TXBUFF,
313 count, 0, allow, 1, 100);
314 if (result != 1 || *allow != 0)
320 priv->flags.write_urb_in_use = 0;
322 dbg("%s(): submitting interrupt urb", __func__);
323 port->interrupt_in_urb->dev = port->serial->dev;
324 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
326 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
327 " with error %d\n", __func__, result);
332 count = kfifo_out_locked(&priv->write_fifo,
333 port->write_urb->transfer_buffer,
335 port->write_urb->transfer_buffer_length = count;
336 port->write_urb->dev = port->serial->dev;
337 result = usb_submit_urb(port->write_urb, GFP_NOIO);
339 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
340 " with error %d\n", __func__, result);
341 priv->flags.write_urb_in_use = 0;
344 usb_serial_port_softint(port);
347 static int oti6858_startup(struct usb_serial *serial)
349 struct usb_serial_port *port = serial->port[0];
350 struct oti6858_private *priv;
353 for (i = 0; i < serial->num_ports; ++i) {
354 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);
357 if (kfifo_alloc(&priv->write_fifo, OTI6858_FIFO_SIZE,
363 spin_lock_init(&priv->lock);
364 init_waitqueue_head(&priv->intr_wait);
365 /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */
366 /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */
368 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
369 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
371 usb_set_serial_port_data(serial->port[i], priv);
373 if (i == serial->num_ports)
376 for (--i; i >= 0; --i) {
377 priv = usb_get_serial_port_data(serial->port[i]);
378 kfifo_free(&priv->write_fifo);
380 usb_set_serial_port_data(serial->port[i], NULL);
385 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
386 const unsigned char *buf, int count)
388 struct oti6858_private *priv = usb_get_serial_port_data(port);
390 dbg("%s(port = %d, count = %d)", __func__, port->number, count);
395 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
400 static int oti6858_write_room(struct tty_struct *tty)
402 struct usb_serial_port *port = tty->driver_data;
403 struct oti6858_private *priv = usb_get_serial_port_data(port);
407 dbg("%s(port = %d)", __func__, port->number);
409 spin_lock_irqsave(&priv->lock, flags);
410 room = kfifo_avail(&priv->write_fifo);
411 spin_unlock_irqrestore(&priv->lock, flags);
416 static int oti6858_chars_in_buffer(struct tty_struct *tty)
418 struct usb_serial_port *port = tty->driver_data;
419 struct oti6858_private *priv = usb_get_serial_port_data(port);
423 dbg("%s(port = %d)", __func__, port->number);
425 spin_lock_irqsave(&priv->lock, flags);
426 chars = kfifo_len(&priv->write_fifo);
427 spin_unlock_irqrestore(&priv->lock, flags);
432 static void oti6858_init_termios(struct tty_struct *tty)
434 *(tty->termios) = tty_std_termios;
435 tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
436 tty->termios->c_ispeed = 38400;
437 tty->termios->c_ospeed = 38400;
440 static void oti6858_set_termios(struct tty_struct *tty,
441 struct usb_serial_port *port, struct ktermios *old_termios)
443 struct oti6858_private *priv = usb_get_serial_port_data(port);
446 u8 frame_fmt, control;
450 dbg("%s(port = %d)", __func__, port->number);
453 dbg("%s(): no tty structures", __func__);
457 cflag = tty->termios->c_cflag;
459 spin_lock_irqsave(&priv->lock, flags);
460 divisor = priv->pending_setup.divisor;
461 frame_fmt = priv->pending_setup.frame_fmt;
462 control = priv->pending_setup.control;
463 spin_unlock_irqrestore(&priv->lock, flags);
465 frame_fmt &= ~FMT_DATA_BITS_MASK;
466 switch (cflag & CSIZE) {
468 frame_fmt |= FMT_DATA_BITS_5;
471 frame_fmt |= FMT_DATA_BITS_6;
474 frame_fmt |= FMT_DATA_BITS_7;
478 frame_fmt |= FMT_DATA_BITS_8;
482 /* manufacturer claims that this device can work with baud rates
483 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
484 * guarantee that any other baud rate will work (especially
487 br = tty_get_baud_rate(tty);
493 br = min(br, OTI6858_MAX_BAUD_RATE);
495 new_divisor = (96000000 + 8 * br) / (16 * br);
496 real_br = 96000000 / (16 * new_divisor);
497 divisor = cpu_to_le16(new_divisor);
498 tty_encode_baud_rate(tty, real_br, real_br);
501 frame_fmt &= ~FMT_STOP_BITS_MASK;
502 if ((cflag & CSTOPB) != 0)
503 frame_fmt |= FMT_STOP_BITS_2;
505 frame_fmt |= FMT_STOP_BITS_1;
507 frame_fmt &= ~FMT_PARITY_MASK;
508 if ((cflag & PARENB) != 0) {
509 if ((cflag & PARODD) != 0)
510 frame_fmt |= FMT_PARITY_ODD;
512 frame_fmt |= FMT_PARITY_EVEN;
514 frame_fmt |= FMT_PARITY_NONE;
517 control &= ~CONTROL_MASK;
518 if ((cflag & CRTSCTS) != 0)
519 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
521 /* change control lines if we are switching to or from B0 */
523 spin_lock_irqsave(&priv->lock, flags);
524 control = priv->line_control;
525 if ((cflag & CBAUD) == B0)
526 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
528 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
529 if (control != priv->line_control) {
530 control = priv->line_control;
531 spin_unlock_irqrestore(&priv->lock, flags);
532 set_control_lines(serial->dev, control);
534 spin_unlock_irqrestore(&priv->lock, flags);
538 spin_lock_irqsave(&priv->lock, flags);
539 if (divisor != priv->pending_setup.divisor
540 || control != priv->pending_setup.control
541 || frame_fmt != priv->pending_setup.frame_fmt) {
542 priv->pending_setup.divisor = divisor;
543 priv->pending_setup.control = control;
544 priv->pending_setup.frame_fmt = frame_fmt;
546 spin_unlock_irqrestore(&priv->lock, flags);
549 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
551 struct oti6858_private *priv = usb_get_serial_port_data(port);
552 struct ktermios tmp_termios;
553 struct usb_serial *serial = port->serial;
554 struct oti6858_control_pkt *buf;
558 dbg("%s(port = %d)", __func__, port->number);
560 usb_clear_halt(serial->dev, port->write_urb->pipe);
561 usb_clear_halt(serial->dev, port->read_urb->pipe);
563 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
565 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
569 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
570 OTI6858_REQ_T_GET_STATUS,
571 OTI6858_REQ_GET_STATUS,
573 buf, OTI6858_CTRL_PKT_SIZE,
575 if (result != OTI6858_CTRL_PKT_SIZE) {
576 /* assume default (after power-on reset) values */
577 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
578 buf->frame_fmt = 0x03; /* 8N1 */
579 buf->something = 0x43;
580 buf->control = 0x4c; /* DTR, RTS */
581 buf->tx_status = 0x00;
582 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
583 buf->rx_bytes_avail = 0x00;
586 spin_lock_irqsave(&priv->lock, flags);
587 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
588 priv->pending_setup.divisor = buf->divisor;
589 priv->pending_setup.frame_fmt = buf->frame_fmt;
590 priv->pending_setup.control = buf->control;
591 spin_unlock_irqrestore(&priv->lock, flags);
594 dbg("%s(): submitting interrupt urb", __func__);
595 port->interrupt_in_urb->dev = serial->dev;
596 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
598 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
599 " with error %d\n", __func__, result);
606 oti6858_set_termios(tty, port, &tmp_termios);
607 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
611 static void oti6858_close(struct usb_serial_port *port)
613 struct oti6858_private *priv = usb_get_serial_port_data(port);
616 dbg("%s(port = %d)", __func__, port->number);
618 spin_lock_irqsave(&priv->lock, flags);
619 /* clear out any remaining data in the buffer */
620 kfifo_reset_out(&priv->write_fifo);
621 spin_unlock_irqrestore(&priv->lock, flags);
623 dbg("%s(): after buf_clear()", __func__);
625 /* cancel scheduled setup */
626 cancel_delayed_work(&priv->delayed_setup_work);
627 cancel_delayed_work(&priv->delayed_write_work);
628 flush_scheduled_work();
630 /* shutdown our urbs */
631 dbg("%s(): shutting down urbs", __func__);
632 usb_kill_urb(port->write_urb);
633 usb_kill_urb(port->read_urb);
634 usb_kill_urb(port->interrupt_in_urb);
637 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
638 unsigned int set, unsigned int clear)
640 struct usb_serial_port *port = tty->driver_data;
641 struct oti6858_private *priv = usb_get_serial_port_data(port);
645 dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)",
646 __func__, port->number, set, clear);
648 if (!usb_get_intfdata(port->serial->interface))
651 /* FIXME: check if this is correct (active high/low) */
652 spin_lock_irqsave(&priv->lock, flags);
653 control = priv->pending_setup.control;
654 if ((set & TIOCM_RTS) != 0)
655 control |= CONTROL_RTS_HIGH;
656 if ((set & TIOCM_DTR) != 0)
657 control |= CONTROL_DTR_HIGH;
658 if ((clear & TIOCM_RTS) != 0)
659 control &= ~CONTROL_RTS_HIGH;
660 if ((clear & TIOCM_DTR) != 0)
661 control &= ~CONTROL_DTR_HIGH;
663 if (control != priv->pending_setup.control)
664 priv->pending_setup.control = control;
666 spin_unlock_irqrestore(&priv->lock, flags);
670 static int oti6858_tiocmget(struct tty_struct *tty, struct file *file)
672 struct usb_serial_port *port = tty->driver_data;
673 struct oti6858_private *priv = usb_get_serial_port_data(port);
678 dbg("%s(port = %d)", __func__, port->number);
680 if (!usb_get_intfdata(port->serial->interface))
683 spin_lock_irqsave(&priv->lock, flags);
684 pin_state = priv->status.pin_state & PIN_MASK;
685 spin_unlock_irqrestore(&priv->lock, flags);
687 /* FIXME: check if this is correct (active high/low) */
688 if ((pin_state & PIN_RTS) != 0)
690 if ((pin_state & PIN_CTS) != 0)
692 if ((pin_state & PIN_DSR) != 0)
694 if ((pin_state & PIN_DTR) != 0)
696 if ((pin_state & PIN_RI) != 0)
698 if ((pin_state & PIN_DCD) != 0)
701 dbg("%s() = 0x%08x", __func__, result);
706 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
708 struct oti6858_private *priv = usb_get_serial_port_data(port);
710 unsigned int prev, status;
711 unsigned int changed;
713 spin_lock_irqsave(&priv->lock, flags);
714 prev = priv->status.pin_state;
715 spin_unlock_irqrestore(&priv->lock, flags);
718 wait_event_interruptible(priv->intr_wait,
719 priv->status.pin_state != prev);
720 if (signal_pending(current))
723 spin_lock_irqsave(&priv->lock, flags);
724 status = priv->status.pin_state & PIN_MASK;
725 spin_unlock_irqrestore(&priv->lock, flags);
727 changed = prev ^ status;
728 /* FIXME: check if this is correct (active high/low) */
729 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
730 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
731 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
732 ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
741 static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
742 unsigned int cmd, unsigned long arg)
744 struct usb_serial_port *port = tty->driver_data;
746 dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)",
747 __func__, port->number, cmd, arg);
751 dbg("%s(): TIOCMIWAIT", __func__);
752 return wait_modem_info(port, arg);
754 dbg("%s(): 0x%04x not supported", __func__, cmd);
761 static void oti6858_release(struct usb_serial *serial)
763 struct oti6858_private *priv;
766 dbg("%s()", __func__);
768 for (i = 0; i < serial->num_ports; ++i) {
769 priv = usb_get_serial_port_data(serial->port[i]);
771 kfifo_free(&priv->write_fifo);
777 static void oti6858_read_int_callback(struct urb *urb)
779 struct usb_serial_port *port = urb->context;
780 struct oti6858_private *priv = usb_get_serial_port_data(port);
781 int transient = 0, can_recv = 0, resubmit = 1;
782 int status = urb->status;
784 dbg("%s(port = %d, status = %d)",
785 __func__, port->number, status);
794 /* this urb is terminated, clean up */
795 dbg("%s(): urb shutting down with status: %d",
799 dbg("%s(): nonzero urb status received: %d",
804 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
805 struct oti6858_control_pkt *xs = urb->transfer_buffer;
808 spin_lock_irqsave(&priv->lock, flags);
810 if (!priv->transient) {
811 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
812 if (xs->rx_bytes_avail == 0) {
814 priv->setup_done = 0;
816 dbg("%s(): scheduling setup_line()",
818 schedule_delayed_work(&priv->delayed_setup_work, 0);
822 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
824 } else if (!priv->setup_done) {
826 } else if (--priv->transient == 0) {
827 if (xs->rx_bytes_avail == 0) {
829 priv->setup_done = 0;
831 dbg("%s(): scheduling setup_line()",
833 schedule_delayed_work(&priv->delayed_setup_work, 0);
838 if (!priv->transient) {
839 if (xs->pin_state != priv->status.pin_state)
840 wake_up_interruptible(&priv->intr_wait);
841 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
844 if (!priv->transient && xs->rx_bytes_avail != 0) {
845 can_recv = xs->rx_bytes_avail;
846 priv->flags.read_urb_in_use = 1;
849 transient = priv->transient;
850 spin_unlock_irqrestore(&priv->lock, flags);
856 port->read_urb->dev = port->serial->dev;
857 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
859 priv->flags.read_urb_in_use = 0;
860 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
861 " error %d\n", __func__, result);
865 } else if (!transient) {
868 spin_lock_irqsave(&priv->lock, flags);
869 if (priv->flags.write_urb_in_use == 0
870 && kfifo_len(&priv->write_fifo) != 0) {
871 schedule_delayed_work(&priv->delayed_write_work, 0);
874 spin_unlock_irqrestore(&priv->lock, flags);
880 /* dbg("%s(): submitting interrupt urb", __func__); */
881 urb->dev = port->serial->dev;
882 result = usb_submit_urb(urb, GFP_ATOMIC);
884 dev_err(&urb->dev->dev,
885 "%s(): usb_submit_urb() failed with"
886 " error %d\n", __func__, result);
891 static void oti6858_read_bulk_callback(struct urb *urb)
893 struct usb_serial_port *port = urb->context;
894 struct oti6858_private *priv = usb_get_serial_port_data(port);
895 struct tty_struct *tty;
896 unsigned char *data = urb->transfer_buffer;
898 int status = urb->status;
901 dbg("%s(port = %d, status = %d)",
902 __func__, port->number, status);
904 spin_lock_irqsave(&priv->lock, flags);
905 priv->flags.read_urb_in_use = 0;
906 spin_unlock_irqrestore(&priv->lock, flags);
910 if (status == -EPROTO) {
911 * PL2303 mysteriously fails with -EPROTO reschedule
913 dbg("%s - caught -EPROTO, resubmitting the urb",
915 result = usb_submit_urb(urb, GFP_ATOMIC);
917 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);
921 dbg("%s(): unable to handle the error, exiting", __func__);
925 tty = tty_port_tty_get(&port->port);
926 if (tty != NULL && urb->actual_length > 0) {
927 tty_insert_flip_string(tty, data, urb->actual_length);
928 tty_flip_buffer_push(tty);
932 /* schedule the interrupt urb */
933 port->interrupt_in_urb->dev = port->serial->dev;
934 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
935 if (result != 0 && result != -EPERM) {
936 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
937 " error %d\n", __func__, result);
941 static void oti6858_write_bulk_callback(struct urb *urb)
943 struct usb_serial_port *port = urb->context;
944 struct oti6858_private *priv = usb_get_serial_port_data(port);
945 int status = urb->status;
948 dbg("%s(port = %d, status = %d)",
949 __func__, port->number, status);
958 /* this urb is terminated, clean up */
959 dbg("%s(): urb shutting down with status: %d",
961 priv->flags.write_urb_in_use = 0;
964 /* error in the urb, so we have to resubmit it */
965 dbg("%s(): nonzero write bulk status received: %d",
967 dbg("%s(): overflow in write", __func__);
969 port->write_urb->transfer_buffer_length = 1;
970 port->write_urb->dev = port->serial->dev;
971 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
973 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
974 " error %d\n", __func__, result);
980 priv->flags.write_urb_in_use = 0;
982 /* schedule the interrupt urb if we are still open */
983 port->interrupt_in_urb->dev = port->serial->dev;
984 dbg("%s(): submitting interrupt urb", __func__);
985 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
987 dev_err(&port->dev, "%s(): failed submitting int urb,"
988 " error %d\n", __func__, result);
992 /* module description and (de)initialization */
994 static int __init oti6858_init(void)
998 retval = usb_serial_register(&oti6858_device);
1000 retval = usb_register(&oti6858_driver);
1002 usb_serial_deregister(&oti6858_device);
1007 static void __exit oti6858_exit(void)
1009 usb_deregister(&oti6858_driver);
1010 usb_serial_deregister(&oti6858_device);
1013 module_init(oti6858_init);
1014 module_exit(oti6858_exit);
1016 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
1017 MODULE_AUTHOR(OTI6858_AUTHOR);
1018 MODULE_VERSION(OTI6858_VERSION);
1019 MODULE_LICENSE("GPL");
1021 module_param(debug, bool, S_IRUGO | S_IWUSR);
1022 MODULE_PARM_DESC(debug, "enable debug output");