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>"
61 static const struct usb_device_id id_table[] = {
62 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
66 MODULE_DEVICE_TABLE(usb, id_table);
69 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
70 #define OTI6858_REQ_T_GET_STATUS 0x01
72 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
73 #define OTI6858_REQ_T_SET_LINE 0x00
75 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
76 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
78 /* format of the control packet */
79 struct oti6858_control_pkt {
80 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
81 #define OTI6858_MAX_BAUD_RATE 3000000
83 #define FMT_STOP_BITS_MASK 0xc0
84 #define FMT_STOP_BITS_1 0x00
85 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
86 #define FMT_PARITY_MASK 0x38
87 #define FMT_PARITY_NONE 0x00
88 #define FMT_PARITY_ODD 0x08
89 #define FMT_PARITY_EVEN 0x18
90 #define FMT_PARITY_MARK 0x28
91 #define FMT_PARITY_SPACE 0x38
92 #define FMT_DATA_BITS_MASK 0x03
93 #define FMT_DATA_BITS_5 0x00
94 #define FMT_DATA_BITS_6 0x01
95 #define FMT_DATA_BITS_7 0x02
96 #define FMT_DATA_BITS_8 0x03
97 u8 something; /* always equals 0x43 */
98 u8 control; /* settings of flow control lines */
99 #define CONTROL_MASK 0x0c
100 #define CONTROL_DTR_HIGH 0x08
101 #define CONTROL_RTS_HIGH 0x04
103 #define TX_BUFFER_EMPTIED 0x09
105 #define PIN_MASK 0x3f
106 #define PIN_MSR_MASK 0x1b
107 #define PIN_RTS 0x20 /* output pin */
108 #define PIN_CTS 0x10 /* input pin, active low */
109 #define PIN_DSR 0x08 /* input pin, active low */
110 #define PIN_DTR 0x04 /* output pin */
111 #define PIN_RI 0x02 /* input pin, active low */
112 #define PIN_DCD 0x01 /* input pin, active low */
113 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
116 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
117 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
118 (((a)->divisor == (priv)->pending_setup.divisor) \
119 && ((a)->control == (priv)->pending_setup.control) \
120 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
122 /* function prototypes */
123 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
124 static void oti6858_close(struct usb_serial_port *port);
125 static void oti6858_set_termios(struct tty_struct *tty,
126 struct usb_serial_port *port, struct ktermios *old);
127 static void oti6858_init_termios(struct tty_struct *tty);
128 static void oti6858_read_int_callback(struct urb *urb);
129 static void oti6858_read_bulk_callback(struct urb *urb);
130 static void oti6858_write_bulk_callback(struct urb *urb);
131 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
132 const unsigned char *buf, int count);
133 static int oti6858_write_room(struct tty_struct *tty);
134 static int oti6858_chars_in_buffer(struct tty_struct *tty);
135 static int oti6858_tiocmget(struct tty_struct *tty);
136 static int oti6858_tiocmset(struct tty_struct *tty,
137 unsigned int set, unsigned int clear);
138 static int oti6858_port_probe(struct usb_serial_port *port);
139 static int oti6858_port_remove(struct usb_serial_port *port);
142 static struct usb_serial_driver oti6858_device = {
144 .owner = THIS_MODULE,
147 .id_table = id_table,
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 .port_probe = oti6858_port_probe,
163 .port_remove = oti6858_port_remove,
166 static struct usb_serial_driver * const serial_drivers[] = {
167 &oti6858_device, NULL
170 struct oti6858_private {
173 struct oti6858_control_pkt status;
179 struct delayed_work delayed_write_work;
188 struct delayed_work delayed_setup_work;
190 struct usb_serial_port *port; /* USB port with which associated */
193 static void setup_line(struct work_struct *work)
195 struct oti6858_private *priv = container_of(work,
196 struct oti6858_private, delayed_setup_work.work);
197 struct usb_serial_port *port = priv->port;
198 struct oti6858_control_pkt *new_setup;
202 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
204 /* we will try again */
205 schedule_delayed_work(&priv->delayed_setup_work,
206 msecs_to_jiffies(2));
210 result = usb_control_msg(port->serial->dev,
211 usb_rcvctrlpipe(port->serial->dev, 0),
212 OTI6858_REQ_T_GET_STATUS,
213 OTI6858_REQ_GET_STATUS,
215 new_setup, OTI6858_CTRL_PKT_SIZE,
218 if (result != OTI6858_CTRL_PKT_SIZE) {
219 dev_err(&port->dev, "%s(): error reading status\n", __func__);
221 /* we will try again */
222 schedule_delayed_work(&priv->delayed_setup_work,
223 msecs_to_jiffies(2));
227 spin_lock_irqsave(&priv->lock, flags);
228 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
229 new_setup->divisor = priv->pending_setup.divisor;
230 new_setup->control = priv->pending_setup.control;
231 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
233 spin_unlock_irqrestore(&priv->lock, flags);
234 result = usb_control_msg(port->serial->dev,
235 usb_sndctrlpipe(port->serial->dev, 0),
236 OTI6858_REQ_T_SET_LINE,
237 OTI6858_REQ_SET_LINE,
239 new_setup, OTI6858_CTRL_PKT_SIZE,
242 spin_unlock_irqrestore(&priv->lock, flags);
247 spin_lock_irqsave(&priv->lock, flags);
248 if (result != OTI6858_CTRL_PKT_SIZE)
250 priv->setup_done = 1;
251 spin_unlock_irqrestore(&priv->lock, flags);
253 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
254 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
256 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
261 static void send_data(struct work_struct *work)
263 struct oti6858_private *priv = container_of(work,
264 struct oti6858_private, delayed_write_work.work);
265 struct usb_serial_port *port = priv->port;
266 int count = 0, result;
270 spin_lock_irqsave(&priv->lock, flags);
271 if (priv->flags.write_urb_in_use) {
272 spin_unlock_irqrestore(&priv->lock, flags);
273 schedule_delayed_work(&priv->delayed_write_work,
274 msecs_to_jiffies(2));
277 priv->flags.write_urb_in_use = 1;
278 spin_unlock_irqrestore(&priv->lock, flags);
280 spin_lock_irqsave(&port->lock, flags);
281 count = kfifo_len(&port->write_fifo);
282 spin_unlock_irqrestore(&port->lock, flags);
284 if (count > port->bulk_out_size)
285 count = port->bulk_out_size;
288 allow = kmalloc(1, GFP_KERNEL);
292 result = usb_control_msg(port->serial->dev,
293 usb_rcvctrlpipe(port->serial->dev, 0),
294 OTI6858_REQ_T_CHECK_TXBUFF,
295 OTI6858_REQ_CHECK_TXBUFF,
296 count, 0, allow, 1, 100);
297 if (result != 1 || *allow != 0)
303 priv->flags.write_urb_in_use = 0;
305 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
306 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
308 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
314 count = kfifo_out_locked(&port->write_fifo,
315 port->write_urb->transfer_buffer,
317 port->write_urb->transfer_buffer_length = count;
318 result = usb_submit_urb(port->write_urb, GFP_NOIO);
320 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
322 priv->flags.write_urb_in_use = 0;
325 usb_serial_port_softint(port);
328 static int oti6858_port_probe(struct usb_serial_port *port)
330 struct oti6858_private *priv;
332 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
336 spin_lock_init(&priv->lock);
338 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
339 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
341 usb_set_serial_port_data(port, priv);
343 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
348 static int oti6858_port_remove(struct usb_serial_port *port)
350 struct oti6858_private *priv;
352 priv = usb_get_serial_port_data(port);
358 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
359 const unsigned char *buf, int count)
364 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
369 static int oti6858_write_room(struct tty_struct *tty)
371 struct usb_serial_port *port = tty->driver_data;
375 spin_lock_irqsave(&port->lock, flags);
376 room = kfifo_avail(&port->write_fifo);
377 spin_unlock_irqrestore(&port->lock, flags);
382 static int oti6858_chars_in_buffer(struct tty_struct *tty)
384 struct usb_serial_port *port = tty->driver_data;
388 spin_lock_irqsave(&port->lock, flags);
389 chars = kfifo_len(&port->write_fifo);
390 spin_unlock_irqrestore(&port->lock, flags);
395 static void oti6858_init_termios(struct tty_struct *tty)
397 tty->termios = tty_std_termios;
398 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
399 tty->termios.c_ispeed = 38400;
400 tty->termios.c_ospeed = 38400;
403 static void oti6858_set_termios(struct tty_struct *tty,
404 struct usb_serial_port *port, struct ktermios *old_termios)
406 struct oti6858_private *priv = usb_get_serial_port_data(port);
409 u8 frame_fmt, control;
413 cflag = tty->termios.c_cflag;
415 spin_lock_irqsave(&priv->lock, flags);
416 divisor = priv->pending_setup.divisor;
417 frame_fmt = priv->pending_setup.frame_fmt;
418 control = priv->pending_setup.control;
419 spin_unlock_irqrestore(&priv->lock, flags);
421 frame_fmt &= ~FMT_DATA_BITS_MASK;
422 switch (cflag & CSIZE) {
424 frame_fmt |= FMT_DATA_BITS_5;
427 frame_fmt |= FMT_DATA_BITS_6;
430 frame_fmt |= FMT_DATA_BITS_7;
434 frame_fmt |= FMT_DATA_BITS_8;
438 /* manufacturer claims that this device can work with baud rates
439 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
440 * guarantee that any other baud rate will work (especially
443 br = tty_get_baud_rate(tty);
449 br = min(br, OTI6858_MAX_BAUD_RATE);
451 new_divisor = (96000000 + 8 * br) / (16 * br);
452 real_br = 96000000 / (16 * new_divisor);
453 divisor = cpu_to_le16(new_divisor);
454 tty_encode_baud_rate(tty, real_br, real_br);
457 frame_fmt &= ~FMT_STOP_BITS_MASK;
458 if ((cflag & CSTOPB) != 0)
459 frame_fmt |= FMT_STOP_BITS_2;
461 frame_fmt |= FMT_STOP_BITS_1;
463 frame_fmt &= ~FMT_PARITY_MASK;
464 if ((cflag & PARENB) != 0) {
465 if ((cflag & PARODD) != 0)
466 frame_fmt |= FMT_PARITY_ODD;
468 frame_fmt |= FMT_PARITY_EVEN;
470 frame_fmt |= FMT_PARITY_NONE;
473 control &= ~CONTROL_MASK;
474 if ((cflag & CRTSCTS) != 0)
475 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
477 /* change control lines if we are switching to or from B0 */
479 spin_lock_irqsave(&priv->lock, flags);
480 control = priv->line_control;
481 if ((cflag & CBAUD) == B0)
482 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
484 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
485 if (control != priv->line_control) {
486 control = priv->line_control;
487 spin_unlock_irqrestore(&priv->lock, flags);
488 set_control_lines(serial->dev, control);
490 spin_unlock_irqrestore(&priv->lock, flags);
494 spin_lock_irqsave(&priv->lock, flags);
495 if (divisor != priv->pending_setup.divisor
496 || control != priv->pending_setup.control
497 || frame_fmt != priv->pending_setup.frame_fmt) {
498 priv->pending_setup.divisor = divisor;
499 priv->pending_setup.control = control;
500 priv->pending_setup.frame_fmt = frame_fmt;
502 spin_unlock_irqrestore(&priv->lock, flags);
505 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
507 struct oti6858_private *priv = usb_get_serial_port_data(port);
508 struct usb_serial *serial = port->serial;
509 struct oti6858_control_pkt *buf;
513 usb_clear_halt(serial->dev, port->write_urb->pipe);
514 usb_clear_halt(serial->dev, port->read_urb->pipe);
516 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
520 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
521 OTI6858_REQ_T_GET_STATUS,
522 OTI6858_REQ_GET_STATUS,
524 buf, OTI6858_CTRL_PKT_SIZE,
526 if (result != OTI6858_CTRL_PKT_SIZE) {
527 /* assume default (after power-on reset) values */
528 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
529 buf->frame_fmt = 0x03; /* 8N1 */
530 buf->something = 0x43;
531 buf->control = 0x4c; /* DTR, RTS */
532 buf->tx_status = 0x00;
533 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
534 buf->rx_bytes_avail = 0x00;
537 spin_lock_irqsave(&priv->lock, flags);
538 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
539 priv->pending_setup.divisor = buf->divisor;
540 priv->pending_setup.frame_fmt = buf->frame_fmt;
541 priv->pending_setup.control = buf->control;
542 spin_unlock_irqrestore(&priv->lock, flags);
545 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
546 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
548 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
556 oti6858_set_termios(tty, port, NULL);
561 static void oti6858_close(struct usb_serial_port *port)
563 struct oti6858_private *priv = usb_get_serial_port_data(port);
566 spin_lock_irqsave(&port->lock, flags);
567 /* clear out any remaining data in the buffer */
568 kfifo_reset_out(&port->write_fifo);
569 spin_unlock_irqrestore(&port->lock, flags);
571 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
573 /* cancel scheduled setup */
574 cancel_delayed_work_sync(&priv->delayed_setup_work);
575 cancel_delayed_work_sync(&priv->delayed_write_work);
577 /* shutdown our urbs */
578 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
579 usb_kill_urb(port->write_urb);
580 usb_kill_urb(port->read_urb);
581 usb_kill_urb(port->interrupt_in_urb);
584 static int oti6858_tiocmset(struct tty_struct *tty,
585 unsigned int set, unsigned int clear)
587 struct usb_serial_port *port = tty->driver_data;
588 struct oti6858_private *priv = usb_get_serial_port_data(port);
592 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
593 __func__, set, clear);
595 /* FIXME: check if this is correct (active high/low) */
596 spin_lock_irqsave(&priv->lock, flags);
597 control = priv->pending_setup.control;
598 if ((set & TIOCM_RTS) != 0)
599 control |= CONTROL_RTS_HIGH;
600 if ((set & TIOCM_DTR) != 0)
601 control |= CONTROL_DTR_HIGH;
602 if ((clear & TIOCM_RTS) != 0)
603 control &= ~CONTROL_RTS_HIGH;
604 if ((clear & TIOCM_DTR) != 0)
605 control &= ~CONTROL_DTR_HIGH;
607 if (control != priv->pending_setup.control)
608 priv->pending_setup.control = control;
610 spin_unlock_irqrestore(&priv->lock, flags);
614 static int oti6858_tiocmget(struct tty_struct *tty)
616 struct usb_serial_port *port = tty->driver_data;
617 struct oti6858_private *priv = usb_get_serial_port_data(port);
622 spin_lock_irqsave(&priv->lock, flags);
623 pin_state = priv->status.pin_state & PIN_MASK;
624 spin_unlock_irqrestore(&priv->lock, flags);
626 /* FIXME: check if this is correct (active high/low) */
627 if ((pin_state & PIN_RTS) != 0)
629 if ((pin_state & PIN_CTS) != 0)
631 if ((pin_state & PIN_DSR) != 0)
633 if ((pin_state & PIN_DTR) != 0)
635 if ((pin_state & PIN_RI) != 0)
637 if ((pin_state & PIN_DCD) != 0)
640 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
645 static void oti6858_read_int_callback(struct urb *urb)
647 struct usb_serial_port *port = urb->context;
648 struct oti6858_private *priv = usb_get_serial_port_data(port);
649 int transient = 0, can_recv = 0, resubmit = 1;
650 int status = urb->status;
659 /* this urb is terminated, clean up */
660 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
664 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
669 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
670 struct oti6858_control_pkt *xs = urb->transfer_buffer;
673 spin_lock_irqsave(&priv->lock, flags);
675 if (!priv->transient) {
676 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
677 if (xs->rx_bytes_avail == 0) {
679 priv->setup_done = 0;
681 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
682 schedule_delayed_work(&priv->delayed_setup_work, 0);
686 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
688 } else if (!priv->setup_done) {
690 } else if (--priv->transient == 0) {
691 if (xs->rx_bytes_avail == 0) {
693 priv->setup_done = 0;
695 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
696 schedule_delayed_work(&priv->delayed_setup_work, 0);
701 if (!priv->transient) {
702 u8 delta = xs->pin_state ^ priv->status.pin_state;
704 if (delta & PIN_MSR_MASK) {
714 wake_up_interruptible(&port->port.delta_msr_wait);
717 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
720 if (!priv->transient && xs->rx_bytes_avail != 0) {
721 can_recv = xs->rx_bytes_avail;
722 priv->flags.read_urb_in_use = 1;
725 transient = priv->transient;
726 spin_unlock_irqrestore(&priv->lock, flags);
732 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
734 priv->flags.read_urb_in_use = 0;
735 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
736 " error %d\n", __func__, result);
740 } else if (!transient) {
744 spin_lock_irqsave(&port->lock, flags);
745 count = kfifo_len(&port->write_fifo);
746 spin_unlock_irqrestore(&port->lock, flags);
748 spin_lock_irqsave(&priv->lock, flags);
749 if (priv->flags.write_urb_in_use == 0 && count != 0) {
750 schedule_delayed_work(&priv->delayed_write_work, 0);
753 spin_unlock_irqrestore(&priv->lock, flags);
759 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
760 result = usb_submit_urb(urb, GFP_ATOMIC);
762 dev_err(&urb->dev->dev,
763 "%s(): usb_submit_urb() failed with"
764 " error %d\n", __func__, result);
769 static void oti6858_read_bulk_callback(struct urb *urb)
771 struct usb_serial_port *port = urb->context;
772 struct oti6858_private *priv = usb_get_serial_port_data(port);
773 unsigned char *data = urb->transfer_buffer;
775 int status = urb->status;
778 spin_lock_irqsave(&priv->lock, flags);
779 priv->flags.read_urb_in_use = 0;
780 spin_unlock_irqrestore(&priv->lock, flags);
783 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
787 if (urb->actual_length > 0) {
788 tty_insert_flip_string(&port->port, data, urb->actual_length);
789 tty_flip_buffer_push(&port->port);
792 /* schedule the interrupt urb */
793 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
794 if (result != 0 && result != -EPERM) {
795 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
796 " error %d\n", __func__, result);
800 static void oti6858_write_bulk_callback(struct urb *urb)
802 struct usb_serial_port *port = urb->context;
803 struct oti6858_private *priv = usb_get_serial_port_data(port);
804 int status = urb->status;
814 /* this urb is terminated, clean up */
815 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
816 priv->flags.write_urb_in_use = 0;
819 /* error in the urb, so we have to resubmit it */
820 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
821 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
823 port->write_urb->transfer_buffer_length = 1;
824 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
826 dev_err_console(port, "%s(): usb_submit_urb() failed,"
827 " error %d\n", __func__, result);
833 priv->flags.write_urb_in_use = 0;
835 /* schedule the interrupt urb if we are still open */
836 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
837 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
839 dev_err(&port->dev, "%s(): failed submitting int urb,"
840 " error %d\n", __func__, result);
844 module_usb_serial_driver(serial_drivers, id_table);
846 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
847 MODULE_AUTHOR(OTI6858_AUTHOR);
848 MODULE_LICENSE("GPL");