- 根目录:
- drivers
- usb
- serial
- oti6858.c
/*
* Ours Technology Inc. OTi-6858 USB to serial adapter driver.
*
* Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20)
* Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail)
* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2003 IBM Corp.
*
* Many thanks to the authors of pl2303 driver: all functions in this file
* are heavily based on pl2303 code, buffering code is a 1-to-1 copy.
*
* Warning! You use this driver on your own risk! The only official
* description of this device I have is datasheet from manufacturer,
* and it doesn't contain almost any information needed to write a driver.
* Almost all knowlegde used while writing this driver was gathered by:
* - analyzing traffic between device and the M$ Windows 2000 driver,
* - trying different bit combinations and checking pin states
* with a voltmeter,
* - receiving malformed frames and producing buffer overflows
* to learn how errors are reported,
* So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE
* CONNECTED TO IT!
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*
* See Documentation/usb/usb-serial.txt for more information on using this
* driver
*
* TODO:
* - implement correct flushing for ioctls and oti6858_close()
* - check how errors (rx overflow, parity error, framing error) are reported
* - implement oti6858_break_ctl()
* - implement more ioctls
* - test/implement flow control
* - allow setting custom baud rates
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>
#include <linux/kfifo.h>
#include "oti6858.h"
#define OTI6858_DESCRIPTION \
"Ours Technology Inc. OTi-6858 USB to serial adapter driver"
#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
{ }
};
MODULE_DEVICE_TABLE(usb, id_table);
/* requests */
#define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
#define OTI6858_REQ_T_GET_STATUS 0x01
#define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
#define OTI6858_REQ_T_SET_LINE 0x00
#define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
#define OTI6858_REQ_T_CHECK_TXBUFF 0x00
/* format of the control packet */
struct oti6858_control_pkt {
__le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
#define OTI6858_MAX_BAUD_RATE 3000000
u8 frame_fmt;
#define FMT_STOP_BITS_MASK 0xc0
#define FMT_STOP_BITS_1 0x00
#define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
#define FMT_PARITY_MASK 0x38
#define FMT_PARITY_NONE 0x00
#define FMT_PARITY_ODD 0x08
#define FMT_PARITY_EVEN 0x18
#define FMT_PARITY_MARK 0x28
#define FMT_PARITY_SPACE 0x38
#define FMT_DATA_BITS_MASK 0x03
#define FMT_DATA_BITS_5 0x00
#define FMT_DATA_BITS_6 0x01
#define FMT_DATA_BITS_7 0x02
#define FMT_DATA_BITS_8 0x03
u8 something; /* always equals 0x43 */
u8 control; /* settings of flow control lines */
#define CONTROL_MASK 0x0c
#define CONTROL_DTR_HIGH 0x08
#define CONTROL_RTS_HIGH 0x04
u8 tx_status;
#define TX_BUFFER_EMPTIED 0x09
u8 pin_state;
#define PIN_MASK 0x3f
#define PIN_MSR_MASK 0x1b
#define PIN_RTS 0x20 /* output pin */
#define PIN_CTS 0x10 /* input pin, active low */
#define PIN_DSR 0x08 /* input pin, active low */
#define PIN_DTR 0x04 /* output pin */
#define PIN_RI 0x02 /* input pin, active low */
#define PIN_DCD 0x01 /* input pin, active low */
u8 rx_bytes_avail; /* number of bytes in rx buffer */;
};
#define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
#define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
(((a)->divisor == (priv)->pending_setup.divisor) \
&& ((a)->control == (priv)->pending_setup.control) \
&& ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
/* function prototypes */
static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
static void oti6858_close(struct usb_serial_port *port);
static void oti6858_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old);
static void oti6858_init_termios(struct tty_struct *tty);
static void oti6858_read_int_callback(struct urb *urb);
static void oti6858_read_bulk_callback(struct urb *urb);
static void oti6858_write_bulk_callback(struct urb *urb);
static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
static int oti6858_write_room(struct tty_struct *tty);
static int oti6858_chars_in_buffer(struct tty_struct *tty);
static int oti6858_tiocmget(struct tty_struct *tty);
static int oti6858_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static int oti6858_port_probe(struct usb_serial_port *port);
static int oti6858_port_remove(struct usb_serial_port *port);
/* device info */
static struct usb_serial_driver oti6858_device = {
.driver = {
.owner = THIS_MODULE,
.name = "oti6858",
},
.id_table = id_table,
.num_ports = 1,
.open = oti6858_open,
.close = oti6858_close,
.write = oti6858_write,
.set_termios = oti6858_set_termios,
.init_termios = oti6858_init_termios,
.tiocmget = oti6858_tiocmget,
.tiocmset = oti6858_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.read_bulk_callback = oti6858_read_bulk_callback,
.read_int_callback = oti6858_read_int_callback,
.write_bulk_callback = oti6858_write_bulk_callback,
.write_room = oti6858_write_room,
.chars_in_buffer = oti6858_chars_in_buffer,
.port_probe = oti6858_port_probe,
.port_remove = oti6858_port_remove,
};
static struct usb_serial_driver * const serial_drivers[] = {
&oti6858_device, NULL
};
struct oti6858_private {
spinlock_t lock;
struct oti6858_control_pkt status;
struct {
u8 read_urb_in_use;
u8 write_urb_in_use;
} flags;
struct delayed_work delayed_write_work;
struct {
__le16 divisor;
u8 frame_fmt;
u8 control;
} pending_setup;
u8 transient;
u8 setup_done;
struct delayed_work delayed_setup_work;
struct usb_serial_port *port; /* USB port with which associated */
};
static void setup_line(struct work_struct *work)
{
struct oti6858_private *priv = container_of(work,
struct oti6858_private, delayed_setup_work.work);
struct usb_serial_port *port = priv->port;
struct oti6858_control_pkt *new_setup;
unsigned long flags;
int result;
new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
if (!new_setup) {
/* we will try again */
schedule_delayed_work(&priv->delayed_setup_work,
msecs_to_jiffies(2));
return;
}
result = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
OTI6858_REQ_T_GET_STATUS,
OTI6858_REQ_GET_STATUS,
0, 0,
new_setup, OTI6858_CTRL_PKT_SIZE,
100);
if (result != OTI6858_CTRL_PKT_SIZE) {
dev_err(&port->dev, "%s(): error reading status\n", __func__);
kfree(new_setup);
/* we will try again */
schedule_delayed_work(&priv->delayed_setup_work,
msecs_to_jiffies(2));
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
new_setup->divisor = priv->pending_setup.divisor;
new_setup->control = priv->pending_setup.control;
new_setup->frame_fmt = priv->pending_setup.frame_fmt;
spin_unlock_irqrestore(&priv->lock, flags);
result = usb_control_msg(port->serial->dev,
usb_sndctrlpipe(port->serial->dev, 0),
OTI6858_REQ_T_SET_LINE,
OTI6858_REQ_SET_LINE,
0, 0,
new_setup, OTI6858_CTRL_PKT_SIZE,
100);
} else {
spin_unlock_irqrestore(&priv->lock, flags);
result = 0;
}
kfree(new_setup);
spin_lock_irqsave(&priv->lock, flags);
if (result != OTI6858_CTRL_PKT_SIZE)
priv->transient = 0;
priv->setup_done = 1;
spin_unlock_irqrestore(&priv->lock, flags);
dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (result != 0) {
dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
__func__, result);
}
}
static void send_data(struct work_struct *work)
{
struct oti6858_private *priv = container_of(work,
struct oti6858_private, delayed_write_work.work);
struct usb_serial_port *port = priv->port;
int count = 0, result;
unsigned long flags;
u8 *allow;
spin_lock_irqsave(&priv->lock, flags);
if (priv->flags.write_urb_in_use) {
spin_unlock_irqrestore(&priv->lock, flags);
schedule_delayed_work(&priv->delayed_write_work,
msecs_to_jiffies(2));
return;
}
priv->flags.write_urb_in_use = 1;
spin_unlock_irqrestore(&priv->lock, flags);
spin_lock_irqsave(&port->lock, flags);
count = kfifo_len(&port->write_fifo);
spin_unlock_irqrestore(&port->lock, flags);
if (count > port->bulk_out_size)
count = port->bulk_out_size;
if (count != 0) {
allow = kmalloc(1, GFP_KERNEL);
if (!allow)
return;
result = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
OTI6858_REQ_T_CHECK_TXBUFF,
OTI6858_REQ_CHECK_TXBUFF,
count, 0, allow, 1, 100);
if (result != 1 || *allow != 0)
count = 0;
kfree(allow);
}
if (count == 0) {
priv->flags.write_urb_in_use = 0;
dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
if (result != 0) {
dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
__func__, result);
}
return;
}
count = kfifo_out_locked(&port->write_fifo,
port->write_urb->transfer_buffer,
count, &port->lock);
port->write_urb->transfer_buffer_length = count;
result = usb_submit_urb(port->write_urb, GFP_NOIO);
if (result != 0) {
dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
__func__, result);
priv->flags.write_urb_in_use = 0;
}
usb_serial_port_softint(port);
}
static int oti6858_port_probe(struct usb_serial_port *port)
{
struct oti6858_private *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->lock);
priv->port = port;
INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
usb_set_serial_port_data(port, priv);
port->port.drain_delay = 256; /* FIXME: check the FIFO length */
return 0;
}
static int oti6858_port_remove(struct usb_serial_port *port)
{
struct oti6858_private *priv;
priv = usb_get_serial_port_data(port);
kfree(priv);
return 0;
}
static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count)
{
if (!count)
return count;
count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
return count;
}
static int oti6858_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int room = 0;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
room = kfifo_avail(&port->write_fifo);
spin_unlock_irqrestore(&port->lock, flags);
return room;
}
static int oti6858_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int chars = 0;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
chars = kfifo_len(&port->write_fifo);
spin_unlock_irqrestore(&port->lock, flags);
return chars;
}
static void oti6858_init_termios(struct tty_struct *tty)
{
tty->termios = tty_std_termios;
tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
tty->termios.c_ispeed = 38400;
tty->termios.c_ospeed = 38400;
}
static void oti6858_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct oti6858_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int cflag;
u8 frame_fmt, control;
__le16 divisor;
int br;
cflag = tty->termios.c_cflag;
spin_lock_irqsave(&priv->lock, flags);
divisor = priv->pending_setup.divisor;
frame_fmt = priv->pending_setup.frame_fmt;
control = priv->pending_setup.control;
spin_unlock_irqrestore(&priv->lock, flags);
frame_fmt &= ~FMT_DATA_BITS_MASK;
switch (cflag & CSIZE) {
case CS5:
frame_fmt |= FMT_DATA_BITS_5;
break;
case CS6:
frame_fmt |= FMT_DATA_BITS_6;
break;
case CS7:
frame_fmt |= FMT_DATA_BITS_7;
break;
default:
case CS8:
frame_fmt |= FMT_DATA_BITS_8;
break;
}
/* manufacturer claims that this device can work with baud rates
* up to 3 Mbps; I've tested it only on 115200 bps, so I can't
* guarantee that any other baud rate will work (especially
* the higher ones)
*/
br = tty_get_baud_rate(tty);
if (br == 0) {
divisor = 0;
} else {
int real_br;
int new_divisor;
br = min(br, OTI6858_MAX_BAUD_RATE);
new_divisor = (96000000 + 8 * br) / (16 * br);
real_br = 96000000 / (16 * new_divisor);
divisor = cpu_to_le16(new_divisor);
tty_encode_baud_rate(tty, real_br, real_br);
}
frame_fmt &= ~FMT_STOP_BITS_MASK;
if ((cflag & CSTOPB) != 0)
frame_fmt |= FMT_STOP_BITS_2;
else
frame_fmt |= FMT_STOP_BITS_1;
frame_fmt &= ~FMT_PARITY_MASK;
if ((cflag & PARENB) != 0) {
if ((cflag & PARODD) != 0)
frame_fmt |= FMT_PARITY_ODD;
else
frame_fmt |= FMT_PARITY_EVEN;
} else {
frame_fmt |= FMT_PARITY_NONE;
}
control &= ~CONTROL_MASK;
if ((cflag & CRTSCTS) != 0)
control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
/* change control lines if we are switching to or from B0 */
/* FIXME:
spin_lock_irqsave(&priv->lock, flags);
control = priv->line_control;
if ((cflag & CBAUD) == B0)
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
else
priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
if (control != priv->line_control) {
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
set_control_lines(serial->dev, control);
} else {
spin_unlock_irqrestore(&priv->lock, flags);
}
*/
spin_lock_irqsave(&priv->lock, flags);
if (divisor != priv->pending_setup.divisor
|| control != priv->pending_setup.control
|| frame_fmt != priv->pending_setup.frame_fmt) {
priv->pending_setup.divisor = divisor;
priv->pending_setup.control = control;
priv->pending_setup.frame_fmt = frame_fmt;
}
spin_unlock_irqrestore(&priv->lock, flags);
}
static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct oti6858_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
struct oti6858_control_pkt *buf;
unsigned long flags;
int result;
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
OTI6858_REQ_T_GET_STATUS,
OTI6858_REQ_GET_STATUS,
0, 0,
buf, OTI6858_CTRL_PKT_SIZE,
100);
if (result != OTI6858_CTRL_PKT_SIZE) {
/* assume default (after power-on reset) values */
buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
buf->frame_fmt = 0x03; /* 8N1 */
buf->something = 0x43;
buf->control = 0x4c; /* DTR, RTS */
buf->tx_status = 0x00;
buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
buf->rx_bytes_avail = 0x00;
}
spin_lock_irqsave(&priv->lock, flags);
memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
priv->pending_setup.divisor = buf->divisor;
priv->pending_setup.frame_fmt = buf->frame_fmt;
priv->pending_setup.control = buf->control;
spin_unlock_irqrestore(&priv->lock, flags);
kfree(buf);
dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (result != 0) {
dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
__func__, result);
oti6858_close(port);
return result;
}
/* setup termios */
if (tty)
oti6858_set_termios(tty, port, NULL);
return 0;
}
static void oti6858_close(struct usb_serial_port *port)
{
struct oti6858_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
/* clear out any remaining data in the buffer */
kfifo_reset_out(&port->write_fifo);
spin_unlock_irqrestore(&port->lock, flags);
dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
/* cancel scheduled setup */
cancel_delayed_work_sync(&priv->delayed_setup_work);
cancel_delayed_work_sync(&priv->delayed_write_work);
/* shutdown our urbs */
dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
usb_kill_urb(port->write_urb);
usb_kill_urb(port->read_urb);
usb_kill_urb(port->interrupt_in_urb);
}
static int oti6858_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct oti6858_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
u8 control;
dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
__func__, set, clear);
/* FIXME: check if this is correct (active high/low) */
spin_lock_irqsave(&priv->lock, flags);
control = priv->pending_setup.control;
if ((set & TIOCM_RTS) != 0)
control |= CONTROL_RTS_HIGH;
if ((set & TIOCM_DTR) != 0)
control |= CONTROL_DTR_HIGH;
if ((clear & TIOCM_RTS) != 0)
control &= ~CONTROL_RTS_HIGH;
if ((clear & TIOCM_DTR) != 0)
control &= ~CONTROL_DTR_HIGH;
if (control != priv->pending_setup.control)
priv->pending_setup.control = control;
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static int oti6858_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct oti6858_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned pin_state;
unsigned result = 0;
spin_lock_irqsave(&priv->lock, flags);
pin_state = priv->status.pin_state & PIN_MASK;
spin_unlock_irqrestore(&priv->lock, flags);
/* FIXME: check if this is correct (active high/low) */
if ((pin_state & PIN_RTS) != 0)
result |= TIOCM_RTS;
if ((pin_state & PIN_CTS) != 0)
result |= TIOCM_CTS;
if ((pin_state & PIN_DSR) != 0)
result |= TIOCM_DSR;
if ((pin_state & PIN_DTR) != 0)
result |= TIOCM_DTR;
if ((pin_state & PIN_RI) != 0)
result |= TIOCM_RI;
if ((pin_state & PIN_DCD) != 0)
result |= TIOCM_CD;
dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
return result;
}
static void oti6858_read_int_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct oti6858_private *priv = usb_get_serial_port_data(port);
int transient = 0, can_recv = 0, resubmit = 1;
int status = urb->status;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
__func__, status);
return;
default:
dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
__func__, status);
break;
}
if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
struct oti6858_control_pkt *xs = urb->transfer_buffer;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
if (!priv->transient) {
if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
if (xs->rx_bytes_avail == 0) {
priv->transient = 4;
priv->setup_done = 0;
resubmit = 0;
dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
schedule_delayed_work(&priv->delayed_setup_work, 0);
}
}
} else {
if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
priv->transient = 0;
} else if (!priv->setup_done) {
resubmit = 0;
} else if (--priv->transient == 0) {
if (xs->rx_bytes_avail == 0) {
priv->transient = 4;
priv->setup_done = 0;
resubmit = 0;
dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
schedule_delayed_work(&priv->delayed_setup_work, 0);
}
}
}
if (!priv->transient) {
u8 delta = xs->pin_state ^ priv->status.pin_state;
if (delta & PIN_MSR_MASK) {
if (delta & PIN_CTS)
port->icount.cts++;
if (delta & PIN_DSR)
port->icount.dsr++;
if (delta & PIN_RI)
port->icount.rng++;
if (delta & PIN_DCD)
port->icount.dcd++;
wake_up_interruptible(&port->port.delta_msr_wait);
}
memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
}
if (!priv->transient && xs->rx_bytes_avail != 0) {
can_recv = xs->rx_bytes_avail;
priv->flags.read_urb_in_use = 1;
}
transient = priv->transient;
spin_unlock_irqrestore(&priv->lock, flags);
}
if (can_recv) {
int result;
result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (result != 0) {
priv->flags.read_urb_in_use = 0;
dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
" error %d\n", __func__, result);
} else {
resubmit = 0;
}
} else if (!transient) {
unsigned long flags;
int count;
spin_lock_irqsave(&port->lock, flags);
count = kfifo_len(&port->write_fifo);
spin_unlock_irqrestore(&port->lock, flags);
spin_lock_irqsave(&priv->lock, flags);
if (priv->flags.write_urb_in_use == 0 && count != 0) {
schedule_delayed_work(&priv->delayed_write_work, 0);
resubmit = 0;
}
spin_unlock_irqrestore(&priv->lock, flags);
}
if (resubmit) {
int result;
/* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result != 0) {
dev_err(&urb->dev->dev,
"%s(): usb_submit_urb() failed with"
" error %d\n", __func__, result);
}
}
}
static void oti6858_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct oti6858_private *priv = usb_get_serial_port_data(port);
unsigned char *data = urb->transfer_buffer;
unsigned long flags;
int status = urb->status;
int result;
spin_lock_irqsave(&priv->lock, flags);
priv->flags.read_urb_in_use = 0;
spin_unlock_irqrestore(&priv->lock, flags);
if (status != 0) {
dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
return;
}
if (urb->actual_length > 0) {
tty_insert_flip_string(&port->port, data, urb->actual_length);
tty_flip_buffer_push(&port->port);
}
/* schedule the interrupt urb */
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result != 0 && result != -EPERM) {
dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
" error %d\n", __func__, result);
}
}
static void oti6858_write_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct oti6858_private *priv = usb_get_serial_port_data(port);
int status = urb->status;
int result;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
priv->flags.write_urb_in_use = 0;
return;
default:
/* error in the urb, so we have to resubmit it */
dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
port->write_urb->transfer_buffer_length = 1;
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result) {
dev_err_console(port, "%s(): usb_submit_urb() failed,"
" error %d\n", __func__, result);
} else {
return;
}
}
priv->flags.write_urb_in_use = 0;
/* schedule the interrupt urb if we are still open */
dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result != 0) {
dev_err(&port->dev, "%s(): failed submitting int urb,"
" error %d\n", __func__, result);
}
}
module_usb_serial_driver(serial_drivers, id_table);
MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
MODULE_AUTHOR(OTI6858_AUTHOR);
MODULE_LICENSE("GPL");