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linux-next/drivers/usb/serial/oti6858.c
Alan Stern f9c99bb8b3 USB: usb-serial: replace shutdown with disconnect, release
This patch (as1254) splits up the shutdown method of usb_serial_driver
into a disconnect and a release method.

The problem is that the usb-serial core was calling shutdown during
disconnect handling, but drivers didn't expect it to be called until
after all the open file references had been closed.  The result was an
oops when the close method tried to use memory that had been
deallocated by shutdown.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:47 -07:00

1213 lines
32 KiB
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/init.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 "oti6858.h"
#define OTI6858_DESCRIPTION \
"Ours Technology Inc. OTi-6858 USB to serial adapter driver"
#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
#define OTI6858_VERSION "0.1"
static struct usb_device_id id_table [] = {
{ USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
{ }
};
MODULE_DEVICE_TABLE(usb, id_table);
static struct usb_driver oti6858_driver = {
.name = "oti6858",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
.no_dynamic_id = 1,
};
static int debug;
/* buffering code, copied from pl2303 driver */
#define PL2303_BUF_SIZE 1024
#define PL2303_TMP_BUF_SIZE 1024
struct oti6858_buf {
unsigned int buf_size;
char *buf_buf;
char *buf_get;
char *buf_put;
};
/* 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_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, struct file *filp);
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 int oti6858_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);
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, struct file *file);
static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
static int oti6858_startup(struct usb_serial *serial);
static void oti6858_release(struct usb_serial *serial);
/* functions operating on buffers */
static struct oti6858_buf *oti6858_buf_alloc(unsigned int size);
static void oti6858_buf_free(struct oti6858_buf *pb);
static void oti6858_buf_clear(struct oti6858_buf *pb);
static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb);
static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb);
static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf,
unsigned int count);
static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf,
unsigned int count);
/* 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,
.ioctl = oti6858_ioctl,
.set_termios = oti6858_set_termios,
.tiocmget = oti6858_tiocmget,
.tiocmset = oti6858_tiocmset,
.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,
.attach = oti6858_startup,
.release = oti6858_release,
};
struct oti6858_private {
spinlock_t lock;
struct oti6858_buf *buf;
struct oti6858_control_pkt status;
struct {
u8 read_urb_in_use;
u8 write_urb_in_use;
u8 termios_initialized;
} 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;
wait_queue_head_t intr_wait;
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;
dbg("%s(port = %d)", __func__, port->number);
new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
if (new_setup == NULL) {
dev_err(&port->dev, "%s(): out of memory!\n", __func__);
/* 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);
dbg("%s(): submitting interrupt urb", __func__);
port->interrupt_in_urb->dev = port->serial->dev;
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result != 0) {
dev_err(&port->dev, "%s(): usb_submit_urb() failed"
" with error %d\n", __func__, result);
}
}
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;
unsigned char allow;
dbg("%s(port = %d)", __func__, port->number);
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;
count = oti6858_buf_data_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
if (count > port->bulk_out_size)
count = port->bulk_out_size;
if (count != 0) {
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;
}
if (count == 0) {
priv->flags.write_urb_in_use = 0;
dbg("%s(): submitting interrupt urb", __func__);
port->interrupt_in_urb->dev = port->serial->dev;
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result != 0) {
dev_err(&port->dev, "%s(): usb_submit_urb() failed"
" with error %d\n", __func__, result);
}
return;
}
spin_lock_irqsave(&priv->lock, flags);
oti6858_buf_get(priv->buf, port->write_urb->transfer_buffer, count);
spin_unlock_irqrestore(&priv->lock, flags);
port->write_urb->transfer_buffer_length = count;
port->write_urb->dev = port->serial->dev;
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result != 0) {
dev_err(&port->dev, "%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_startup(struct usb_serial *serial)
{
struct usb_serial_port *port = serial->port[0];
struct oti6858_private *priv;
int i;
for (i = 0; i < serial->num_ports; ++i) {
priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);
if (!priv)
break;
priv->buf = oti6858_buf_alloc(PL2303_BUF_SIZE);
if (priv->buf == NULL) {
kfree(priv);
break;
}
spin_lock_init(&priv->lock);
init_waitqueue_head(&priv->intr_wait);
/* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */
/* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */
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(serial->port[i], priv);
}
if (i == serial->num_ports)
return 0;
for (--i; i >= 0; --i) {
priv = usb_get_serial_port_data(serial->port[i]);
oti6858_buf_free(priv->buf);
kfree(priv);
usb_set_serial_port_data(serial->port[i], NULL);
}
return -ENOMEM;
}
static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count)
{
struct oti6858_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s(port = %d, count = %d)", __func__, port->number, count);
if (!count)
return count;
spin_lock_irqsave(&priv->lock, flags);
count = oti6858_buf_put(priv->buf, buf, count);
spin_unlock_irqrestore(&priv->lock, flags);
return count;
}
static int oti6858_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct oti6858_private *priv = usb_get_serial_port_data(port);
int room = 0;
unsigned long flags;
dbg("%s(port = %d)", __func__, port->number);
spin_lock_irqsave(&priv->lock, flags);
room = oti6858_buf_space_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
return room;
}
static int oti6858_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct oti6858_private *priv = usb_get_serial_port_data(port);
int chars = 0;
unsigned long flags;
dbg("%s(port = %d)", __func__, port->number);
spin_lock_irqsave(&priv->lock, flags);
chars = oti6858_buf_data_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
return chars;
}
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;
dbg("%s(port = %d)", __func__, port->number);
if (!tty) {
dbg("%s(): no tty structures", __func__);
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (!priv->flags.termios_initialized) {
*(tty->termios) = tty_std_termios;
tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
tty->termios->c_ispeed = 38400;
tty->termios->c_ospeed = 38400;
priv->flags.termios_initialized = 1;
}
spin_unlock_irqrestore(&priv->lock, flags);
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 file *filp)
{
struct oti6858_private *priv = usb_get_serial_port_data(port);
struct ktermios tmp_termios;
struct usb_serial *serial = port->serial;
struct oti6858_control_pkt *buf;
unsigned long flags;
int result;
dbg("%s(port = %d)", __func__, port->number);
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
if (port->port.count != 1)
return 0;
buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
if (buf == NULL) {
dev_err(&port->dev, "%s(): out of memory!\n", __func__);
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);
dbg("%s(): submitting interrupt urb", __func__);
port->interrupt_in_urb->dev = serial->dev;
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 -EPROTO;
}
/* setup termios */
if (tty)
oti6858_set_termios(tty, port, &tmp_termios);
port->port.drain_delay = 256; /* FIXME: check the FIFO length */
return 0;
}
static void oti6858_close(struct usb_serial_port *port)
{
struct oti6858_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s(port = %d)", __func__, port->number);
spin_lock_irqsave(&priv->lock, flags);
/* clear out any remaining data in the buffer */
oti6858_buf_clear(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s(): after buf_clear()", __func__);
/* cancel scheduled setup */
cancel_delayed_work(&priv->delayed_setup_work);
cancel_delayed_work(&priv->delayed_write_work);
flush_scheduled_work();
/* shutdown our urbs */
dbg("%s(): shutting down urbs", __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, struct file *file,
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;
dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)",
__func__, port->number, set, clear);
if (!usb_get_intfdata(port->serial->interface))
return -ENODEV;
/* 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 file *file)
{
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;
dbg("%s(port = %d)", __func__, port->number);
if (!usb_get_intfdata(port->serial->interface))
return -ENODEV;
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;
dbg("%s() = 0x%08x", __func__, result);
return result;
}
static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
{
struct oti6858_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int prev, status;
unsigned int changed;
spin_lock_irqsave(&priv->lock, flags);
prev = priv->status.pin_state;
spin_unlock_irqrestore(&priv->lock, flags);
while (1) {
wait_event_interruptible(priv->intr_wait,
priv->status.pin_state != prev);
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irqsave(&priv->lock, flags);
status = priv->status.pin_state & PIN_MASK;
spin_unlock_irqrestore(&priv->lock, flags);
changed = prev ^ status;
/* FIXME: check if this is correct (active high/low) */
if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
((arg & TIOCM_CTS) && (changed & PIN_CTS)))
return 0;
prev = status;
}
/* NOTREACHED */
return 0;
}
static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)",
__func__, port->number, cmd, arg);
switch (cmd) {
case TIOCMIWAIT:
dbg("%s(): TIOCMIWAIT", __func__);
return wait_modem_info(port, arg);
default:
dbg("%s(): 0x%04x not supported", __func__, cmd);
break;
}
return -ENOIOCTLCMD;
}
static void oti6858_release(struct usb_serial *serial)
{
struct oti6858_private *priv;
int i;
dbg("%s()", __func__);
for (i = 0; i < serial->num_ports; ++i) {
priv = usb_get_serial_port_data(serial->port[i]);
if (priv) {
oti6858_buf_free(priv->buf);
kfree(priv);
}
}
}
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;
dbg("%s(port = %d, status = %d)",
__func__, port->number, status);
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s(): urb shutting down with status: %d",
__func__, status);
return;
default:
dbg("%s(): nonzero urb status received: %d",
__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;
dbg("%s(): scheduling setup_line()",
__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;
dbg("%s(): scheduling setup_line()",
__func__);
schedule_delayed_work(&priv->delayed_setup_work, 0);
}
}
}
if (!priv->transient) {
if (xs->pin_state != priv->status.pin_state)
wake_up_interruptible(&priv->intr_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;
port->read_urb->dev = port->serial->dev;
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;
spin_lock_irqsave(&priv->lock, flags);
if (priv->flags.write_urb_in_use == 0
&& oti6858_buf_data_avail(priv->buf) != 0) {
schedule_delayed_work(&priv->delayed_write_work, 0);
resubmit = 0;
}
spin_unlock_irqrestore(&priv->lock, flags);
}
if (resubmit) {
int result;
/* dbg("%s(): submitting interrupt urb", __func__); */
urb->dev = port->serial->dev;
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);
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
unsigned long flags;
int status = urb->status;
int result;
dbg("%s(port = %d, status = %d)",
__func__, port->number, status);
spin_lock_irqsave(&priv->lock, flags);
priv->flags.read_urb_in_use = 0;
spin_unlock_irqrestore(&priv->lock, flags);
if (status != 0) {
if (!port->port.count) {
dbg("%s(): port is closed, exiting", __func__);
return;
}
/*
if (status == -EPROTO) {
* PL2303 mysteriously fails with -EPROTO reschedule
the read *
dbg("%s - caught -EPROTO, resubmitting the urb",
__func__);
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);
return;
}
*/
dbg("%s(): unable to handle the error, exiting", __func__);
return;
}
tty = tty_port_tty_get(&port->port);
if (tty != NULL && urb->actual_length > 0) {
tty_insert_flip_string(tty, data, urb->actual_length);
tty_flip_buffer_push(tty);
}
tty_kref_put(tty);
/* schedule the interrupt urb if we are still open */
if (port->port.count != 0) {
port->interrupt_in_urb->dev = port->serial->dev;
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result != 0) {
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;
dbg("%s(port = %d, status = %d)",
__func__, port->number, status);
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s(): urb shutting down with status: %d",
__func__, status);
priv->flags.write_urb_in_use = 0;
return;
default:
/* error in the urb, so we have to resubmit it */
dbg("%s(): nonzero write bulk status received: %d",
__func__, status);
dbg("%s(): overflow in write", __func__);
port->write_urb->transfer_buffer_length = 1;
port->write_urb->dev = port->serial->dev;
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result) {
dev_err(&port->dev, "%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 */
port->interrupt_in_urb->dev = port->serial->dev;
dbg("%s(): submitting interrupt urb", __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);
}
}
/*
* oti6858_buf_alloc
*
* Allocate a circular buffer and all associated memory.
*/
static struct oti6858_buf *oti6858_buf_alloc(unsigned int size)
{
struct oti6858_buf *pb;
if (size == 0)
return NULL;
pb = kmalloc(sizeof(struct oti6858_buf), GFP_KERNEL);
if (pb == NULL)
return NULL;
pb->buf_buf = kmalloc(size, GFP_KERNEL);
if (pb->buf_buf == NULL) {
kfree(pb);
return NULL;
}
pb->buf_size = size;
pb->buf_get = pb->buf_put = pb->buf_buf;
return pb;
}
/*
* oti6858_buf_free
*
* Free the buffer and all associated memory.
*/
static void oti6858_buf_free(struct oti6858_buf *pb)
{
if (pb) {
kfree(pb->buf_buf);
kfree(pb);
}
}
/*
* oti6858_buf_clear
*
* Clear out all data in the circular buffer.
*/
static void oti6858_buf_clear(struct oti6858_buf *pb)
{
if (pb != NULL) {
/* equivalent to a get of all data available */
pb->buf_get = pb->buf_put;
}
}
/*
* oti6858_buf_data_avail
*
* Return the number of bytes of data available in the circular
* buffer.
*/
static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb)
{
if (pb == NULL)
return 0;
return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
}
/*
* oti6858_buf_space_avail
*
* Return the number of bytes of space available in the circular
* buffer.
*/
static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb)
{
if (pb == NULL)
return 0;
return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
}
/*
* oti6858_buf_put
*
* Copy data data from a user buffer and put it into the circular buffer.
* Restrict to the amount of space available.
*
* Return the number of bytes copied.
*/
static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf,
unsigned int count)
{
unsigned int len;
if (pb == NULL)
return 0;
len = oti6858_buf_space_avail(pb);
if (count > len)
count = len;
if (count == 0)
return 0;
len = pb->buf_buf + pb->buf_size - pb->buf_put;
if (count > len) {
memcpy(pb->buf_put, buf, len);
memcpy(pb->buf_buf, buf+len, count - len);
pb->buf_put = pb->buf_buf + count - len;
} else {
memcpy(pb->buf_put, buf, count);
if (count < len)
pb->buf_put += count;
else /* count == len */
pb->buf_put = pb->buf_buf;
}
return count;
}
/*
* oti6858_buf_get
*
* Get data from the circular buffer and copy to the given buffer.
* Restrict to the amount of data available.
*
* Return the number of bytes copied.
*/
static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf,
unsigned int count)
{
unsigned int len;
if (pb == NULL)
return 0;
len = oti6858_buf_data_avail(pb);
if (count > len)
count = len;
if (count == 0)
return 0;
len = pb->buf_buf + pb->buf_size - pb->buf_get;
if (count > len) {
memcpy(buf, pb->buf_get, len);
memcpy(buf+len, pb->buf_buf, count - len);
pb->buf_get = pb->buf_buf + count - len;
} else {
memcpy(buf, pb->buf_get, count);
if (count < len)
pb->buf_get += count;
else /* count == len */
pb->buf_get = pb->buf_buf;
}
return count;
}
/* module description and (de)initialization */
static int __init oti6858_init(void)
{
int retval;
retval = usb_serial_register(&oti6858_device);
if (retval == 0) {
retval = usb_register(&oti6858_driver);
if (retval)
usb_serial_deregister(&oti6858_device);
}
return retval;
}
static void __exit oti6858_exit(void)
{
usb_deregister(&oti6858_driver);
usb_serial_deregister(&oti6858_device);
}
module_init(oti6858_init);
module_exit(oti6858_exit);
MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
MODULE_AUTHOR(OTI6858_AUTHOR);
MODULE_VERSION(OTI6858_VERSION);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "enable debug output");