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_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 */;
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))
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_tiocmiwait(struct tty_struct *tty, unsigned long arg);
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 = oti6858_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);
203 if (new_setup == NULL) {
204 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
205 /* we will try again */
206 schedule_delayed_work(&priv->delayed_setup_work,
207 msecs_to_jiffies(2));
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,
216 new_setup, OTI6858_CTRL_PKT_SIZE,
219 if (result != OTI6858_CTRL_PKT_SIZE) {
220 dev_err(&port->dev, "%s(): error reading status\n", __func__);
222 /* we will try again */
223 schedule_delayed_work(&priv->delayed_setup_work,
224 msecs_to_jiffies(2));
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;
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,
240 new_setup, OTI6858_CTRL_PKT_SIZE,
243 spin_unlock_irqrestore(&priv->lock, flags);
248 spin_lock_irqsave(&priv->lock, flags);
249 if (result != OTI6858_CTRL_PKT_SIZE)
251 priv->setup_done = 1;
252 spin_unlock_irqrestore(&priv->lock, flags);
254 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
255 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
257 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
262 static void send_data(struct work_struct *work)
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;
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));
278 priv->flags.write_urb_in_use = 1;
279 spin_unlock_irqrestore(&priv->lock, flags);
281 spin_lock_irqsave(&port->lock, flags);
282 count = kfifo_len(&port->write_fifo);
283 spin_unlock_irqrestore(&port->lock, flags);
285 if (count > port->bulk_out_size)
286 count = port->bulk_out_size;
289 allow = kmalloc(1, GFP_KERNEL);
291 dev_err_console(port, "%s(): kmalloc failed\n",
295 result = usb_control_msg(port->serial->dev,
296 usb_rcvctrlpipe(port->serial->dev, 0),
297 OTI6858_REQ_T_CHECK_TXBUFF,
298 OTI6858_REQ_CHECK_TXBUFF,
299 count, 0, allow, 1, 100);
300 if (result != 1 || *allow != 0)
306 priv->flags.write_urb_in_use = 0;
308 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
309 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
311 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
317 count = kfifo_out_locked(&port->write_fifo,
318 port->write_urb->transfer_buffer,
320 port->write_urb->transfer_buffer_length = count;
321 result = usb_submit_urb(port->write_urb, GFP_NOIO);
323 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
325 priv->flags.write_urb_in_use = 0;
328 usb_serial_port_softint(port);
331 static int oti6858_port_probe(struct usb_serial_port *port)
333 struct oti6858_private *priv;
335 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
339 spin_lock_init(&priv->lock);
341 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
342 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
344 usb_set_serial_port_data(port, priv);
346 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
351 static int oti6858_port_remove(struct usb_serial_port *port)
353 struct oti6858_private *priv;
355 priv = usb_get_serial_port_data(port);
361 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
362 const unsigned char *buf, int count)
367 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
372 static int oti6858_write_room(struct tty_struct *tty)
374 struct usb_serial_port *port = tty->driver_data;
378 spin_lock_irqsave(&port->lock, flags);
379 room = kfifo_avail(&port->write_fifo);
380 spin_unlock_irqrestore(&port->lock, flags);
385 static int oti6858_chars_in_buffer(struct tty_struct *tty)
387 struct usb_serial_port *port = tty->driver_data;
391 spin_lock_irqsave(&port->lock, flags);
392 chars = kfifo_len(&port->write_fifo);
393 spin_unlock_irqrestore(&port->lock, flags);
398 static void oti6858_init_termios(struct tty_struct *tty)
400 tty->termios = tty_std_termios;
401 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
402 tty->termios.c_ispeed = 38400;
403 tty->termios.c_ospeed = 38400;
406 static void oti6858_set_termios(struct tty_struct *tty,
407 struct usb_serial_port *port, struct ktermios *old_termios)
409 struct oti6858_private *priv = usb_get_serial_port_data(port);
412 u8 frame_fmt, control;
416 cflag = tty->termios.c_cflag;
418 spin_lock_irqsave(&priv->lock, flags);
419 divisor = priv->pending_setup.divisor;
420 frame_fmt = priv->pending_setup.frame_fmt;
421 control = priv->pending_setup.control;
422 spin_unlock_irqrestore(&priv->lock, flags);
424 frame_fmt &= ~FMT_DATA_BITS_MASK;
425 switch (cflag & CSIZE) {
427 frame_fmt |= FMT_DATA_BITS_5;
430 frame_fmt |= FMT_DATA_BITS_6;
433 frame_fmt |= FMT_DATA_BITS_7;
437 frame_fmt |= FMT_DATA_BITS_8;
441 /* manufacturer claims that this device can work with baud rates
442 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
443 * guarantee that any other baud rate will work (especially
446 br = tty_get_baud_rate(tty);
452 br = min(br, OTI6858_MAX_BAUD_RATE);
454 new_divisor = (96000000 + 8 * br) / (16 * br);
455 real_br = 96000000 / (16 * new_divisor);
456 divisor = cpu_to_le16(new_divisor);
457 tty_encode_baud_rate(tty, real_br, real_br);
460 frame_fmt &= ~FMT_STOP_BITS_MASK;
461 if ((cflag & CSTOPB) != 0)
462 frame_fmt |= FMT_STOP_BITS_2;
464 frame_fmt |= FMT_STOP_BITS_1;
466 frame_fmt &= ~FMT_PARITY_MASK;
467 if ((cflag & PARENB) != 0) {
468 if ((cflag & PARODD) != 0)
469 frame_fmt |= FMT_PARITY_ODD;
471 frame_fmt |= FMT_PARITY_EVEN;
473 frame_fmt |= FMT_PARITY_NONE;
476 control &= ~CONTROL_MASK;
477 if ((cflag & CRTSCTS) != 0)
478 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
480 /* change control lines if we are switching to or from B0 */
482 spin_lock_irqsave(&priv->lock, flags);
483 control = priv->line_control;
484 if ((cflag & CBAUD) == B0)
485 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
487 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
488 if (control != priv->line_control) {
489 control = priv->line_control;
490 spin_unlock_irqrestore(&priv->lock, flags);
491 set_control_lines(serial->dev, control);
493 spin_unlock_irqrestore(&priv->lock, flags);
497 spin_lock_irqsave(&priv->lock, flags);
498 if (divisor != priv->pending_setup.divisor
499 || control != priv->pending_setup.control
500 || frame_fmt != priv->pending_setup.frame_fmt) {
501 priv->pending_setup.divisor = divisor;
502 priv->pending_setup.control = control;
503 priv->pending_setup.frame_fmt = frame_fmt;
505 spin_unlock_irqrestore(&priv->lock, flags);
508 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
510 struct oti6858_private *priv = usb_get_serial_port_data(port);
511 struct usb_serial *serial = port->serial;
512 struct oti6858_control_pkt *buf;
516 usb_clear_halt(serial->dev, port->write_urb->pipe);
517 usb_clear_halt(serial->dev, port->read_urb->pipe);
519 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
521 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
525 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
526 OTI6858_REQ_T_GET_STATUS,
527 OTI6858_REQ_GET_STATUS,
529 buf, OTI6858_CTRL_PKT_SIZE,
531 if (result != OTI6858_CTRL_PKT_SIZE) {
532 /* assume default (after power-on reset) values */
533 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
534 buf->frame_fmt = 0x03; /* 8N1 */
535 buf->something = 0x43;
536 buf->control = 0x4c; /* DTR, RTS */
537 buf->tx_status = 0x00;
538 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
539 buf->rx_bytes_avail = 0x00;
542 spin_lock_irqsave(&priv->lock, flags);
543 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
544 priv->pending_setup.divisor = buf->divisor;
545 priv->pending_setup.frame_fmt = buf->frame_fmt;
546 priv->pending_setup.control = buf->control;
547 spin_unlock_irqrestore(&priv->lock, flags);
550 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
551 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
553 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
561 oti6858_set_termios(tty, port, NULL);
566 static void oti6858_close(struct usb_serial_port *port)
568 struct oti6858_private *priv = usb_get_serial_port_data(port);
571 spin_lock_irqsave(&port->lock, flags);
572 /* clear out any remaining data in the buffer */
573 kfifo_reset_out(&port->write_fifo);
574 spin_unlock_irqrestore(&port->lock, flags);
576 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
578 /* cancel scheduled setup */
579 cancel_delayed_work_sync(&priv->delayed_setup_work);
580 cancel_delayed_work_sync(&priv->delayed_write_work);
582 /* shutdown our urbs */
583 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
584 usb_kill_urb(port->write_urb);
585 usb_kill_urb(port->read_urb);
586 usb_kill_urb(port->interrupt_in_urb);
589 static int oti6858_tiocmset(struct tty_struct *tty,
590 unsigned int set, unsigned int clear)
592 struct usb_serial_port *port = tty->driver_data;
593 struct oti6858_private *priv = usb_get_serial_port_data(port);
597 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
598 __func__, set, clear);
600 /* FIXME: check if this is correct (active high/low) */
601 spin_lock_irqsave(&priv->lock, flags);
602 control = priv->pending_setup.control;
603 if ((set & TIOCM_RTS) != 0)
604 control |= CONTROL_RTS_HIGH;
605 if ((set & TIOCM_DTR) != 0)
606 control |= CONTROL_DTR_HIGH;
607 if ((clear & TIOCM_RTS) != 0)
608 control &= ~CONTROL_RTS_HIGH;
609 if ((clear & TIOCM_DTR) != 0)
610 control &= ~CONTROL_DTR_HIGH;
612 if (control != priv->pending_setup.control)
613 priv->pending_setup.control = control;
615 spin_unlock_irqrestore(&priv->lock, flags);
619 static int oti6858_tiocmget(struct tty_struct *tty)
621 struct usb_serial_port *port = tty->driver_data;
622 struct oti6858_private *priv = usb_get_serial_port_data(port);
627 spin_lock_irqsave(&priv->lock, flags);
628 pin_state = priv->status.pin_state & PIN_MASK;
629 spin_unlock_irqrestore(&priv->lock, flags);
631 /* FIXME: check if this is correct (active high/low) */
632 if ((pin_state & PIN_RTS) != 0)
634 if ((pin_state & PIN_CTS) != 0)
636 if ((pin_state & PIN_DSR) != 0)
638 if ((pin_state & PIN_DTR) != 0)
640 if ((pin_state & PIN_RI) != 0)
642 if ((pin_state & PIN_DCD) != 0)
645 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
650 static int oti6858_tiocmiwait(struct tty_struct *tty, unsigned long arg)
652 struct usb_serial_port *port = tty->driver_data;
653 struct oti6858_private *priv = usb_get_serial_port_data(port);
655 unsigned int prev, status;
656 unsigned int changed;
658 spin_lock_irqsave(&priv->lock, flags);
659 prev = priv->status.pin_state;
660 spin_unlock_irqrestore(&priv->lock, flags);
663 wait_event_interruptible(port->port.delta_msr_wait,
664 port->serial->disconnected ||
665 priv->status.pin_state != prev);
666 if (signal_pending(current))
669 if (port->serial->disconnected)
672 spin_lock_irqsave(&priv->lock, flags);
673 status = priv->status.pin_state & PIN_MASK;
674 spin_unlock_irqrestore(&priv->lock, flags);
676 changed = prev ^ status;
677 /* FIXME: check if this is correct (active high/low) */
678 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
679 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
680 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
681 ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
690 static void oti6858_read_int_callback(struct urb *urb)
692 struct usb_serial_port *port = urb->context;
693 struct oti6858_private *priv = usb_get_serial_port_data(port);
694 int transient = 0, can_recv = 0, resubmit = 1;
695 int status = urb->status;
704 /* this urb is terminated, clean up */
705 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
709 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
714 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
715 struct oti6858_control_pkt *xs = urb->transfer_buffer;
718 spin_lock_irqsave(&priv->lock, flags);
720 if (!priv->transient) {
721 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
722 if (xs->rx_bytes_avail == 0) {
724 priv->setup_done = 0;
726 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
727 schedule_delayed_work(&priv->delayed_setup_work, 0);
731 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
733 } else if (!priv->setup_done) {
735 } else if (--priv->transient == 0) {
736 if (xs->rx_bytes_avail == 0) {
738 priv->setup_done = 0;
740 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
741 schedule_delayed_work(&priv->delayed_setup_work, 0);
746 if (!priv->transient) {
747 if (xs->pin_state != priv->status.pin_state)
748 wake_up_interruptible(&port->port.delta_msr_wait);
749 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
752 if (!priv->transient && xs->rx_bytes_avail != 0) {
753 can_recv = xs->rx_bytes_avail;
754 priv->flags.read_urb_in_use = 1;
757 transient = priv->transient;
758 spin_unlock_irqrestore(&priv->lock, flags);
764 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
766 priv->flags.read_urb_in_use = 0;
767 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
768 " error %d\n", __func__, result);
772 } else if (!transient) {
776 spin_lock_irqsave(&port->lock, flags);
777 count = kfifo_len(&port->write_fifo);
778 spin_unlock_irqrestore(&port->lock, flags);
780 spin_lock_irqsave(&priv->lock, flags);
781 if (priv->flags.write_urb_in_use == 0 && count != 0) {
782 schedule_delayed_work(&priv->delayed_write_work, 0);
785 spin_unlock_irqrestore(&priv->lock, flags);
791 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
792 result = usb_submit_urb(urb, GFP_ATOMIC);
794 dev_err(&urb->dev->dev,
795 "%s(): usb_submit_urb() failed with"
796 " error %d\n", __func__, result);
801 static void oti6858_read_bulk_callback(struct urb *urb)
803 struct usb_serial_port *port = urb->context;
804 struct oti6858_private *priv = usb_get_serial_port_data(port);
805 unsigned char *data = urb->transfer_buffer;
807 int status = urb->status;
810 spin_lock_irqsave(&priv->lock, flags);
811 priv->flags.read_urb_in_use = 0;
812 spin_unlock_irqrestore(&priv->lock, flags);
815 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
819 if (urb->actual_length > 0) {
820 tty_insert_flip_string(&port->port, data, urb->actual_length);
821 tty_flip_buffer_push(&port->port);
824 /* schedule the interrupt urb */
825 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
826 if (result != 0 && result != -EPERM) {
827 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
828 " error %d\n", __func__, result);
832 static void oti6858_write_bulk_callback(struct urb *urb)
834 struct usb_serial_port *port = urb->context;
835 struct oti6858_private *priv = usb_get_serial_port_data(port);
836 int status = urb->status;
846 /* this urb is terminated, clean up */
847 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
848 priv->flags.write_urb_in_use = 0;
851 /* error in the urb, so we have to resubmit it */
852 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
853 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
855 port->write_urb->transfer_buffer_length = 1;
856 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
858 dev_err_console(port, "%s(): usb_submit_urb() failed,"
859 " error %d\n", __func__, result);
865 priv->flags.write_urb_in_use = 0;
867 /* schedule the interrupt urb if we are still open */
868 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
869 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
871 dev_err(&port->dev, "%s(): failed submitting int urb,"
872 " error %d\n", __func__, result);
876 module_usb_serial_driver(serial_drivers, id_table);
878 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
879 MODULE_AUTHOR(OTI6858_AUTHOR);
880 MODULE_LICENSE("GPL");