linux/drivers/usb/serial/spcp8x5.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

1058 lines
27 KiB
C

/*
* spcp8x5 USB to serial adaptor driver
*
* Copyright (C) 2006 Linxb (xubin.lin@worldplus.com.cn)
* Copyright (C) 2006 S1 Corp.
*
* Original driver for 2.6.10 pl2303 driver by
* Greg Kroah-Hartman (greg@kroah.com)
* Changes for 2.6.20 by Harald Klein <hari@vt100.at>
*
* 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, or
* (at your option) any later version.
*
*
*/
#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/module.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
/* Version Information */
#define DRIVER_VERSION "v0.04"
#define DRIVER_DESC "SPCP8x5 USB to serial adaptor driver"
static int debug;
#define SPCP8x5_007_VID 0x04FC
#define SPCP8x5_007_PID 0x0201
#define SPCP8x5_008_VID 0x04fc
#define SPCP8x5_008_PID 0x0235
#define SPCP8x5_PHILIPS_VID 0x0471
#define SPCP8x5_PHILIPS_PID 0x081e
#define SPCP8x5_INTERMATIC_VID 0x04FC
#define SPCP8x5_INTERMATIC_PID 0x0204
#define SPCP8x5_835_VID 0x04fc
#define SPCP8x5_835_PID 0x0231
static struct usb_device_id id_table [] = {
{ USB_DEVICE(SPCP8x5_PHILIPS_VID , SPCP8x5_PHILIPS_PID)},
{ USB_DEVICE(SPCP8x5_INTERMATIC_VID, SPCP8x5_INTERMATIC_PID)},
{ USB_DEVICE(SPCP8x5_835_VID, SPCP8x5_835_PID)},
{ USB_DEVICE(SPCP8x5_008_VID, SPCP8x5_008_PID)},
{ USB_DEVICE(SPCP8x5_007_VID, SPCP8x5_007_PID)},
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
struct spcp8x5_usb_ctrl_arg {
u8 type;
u8 cmd;
u8 cmd_type;
u16 value;
u16 index;
u16 length;
};
/* wait 30s before close */
#define SPCP8x5_CLOSING_WAIT (30*HZ)
#define SPCP8x5_BUF_SIZE 1024
/* spcp8x5 spec register define */
#define MCR_CONTROL_LINE_RTS 0x02
#define MCR_CONTROL_LINE_DTR 0x01
#define MCR_DTR 0x01
#define MCR_RTS 0x02
#define MSR_STATUS_LINE_DCD 0x80
#define MSR_STATUS_LINE_RI 0x40
#define MSR_STATUS_LINE_DSR 0x20
#define MSR_STATUS_LINE_CTS 0x10
/* verdor command here , we should define myself */
#define SET_DEFAULT 0x40
#define SET_DEFAULT_TYPE 0x20
#define SET_UART_FORMAT 0x40
#define SET_UART_FORMAT_TYPE 0x21
#define SET_UART_FORMAT_SIZE_5 0x00
#define SET_UART_FORMAT_SIZE_6 0x01
#define SET_UART_FORMAT_SIZE_7 0x02
#define SET_UART_FORMAT_SIZE_8 0x03
#define SET_UART_FORMAT_STOP_1 0x00
#define SET_UART_FORMAT_STOP_2 0x04
#define SET_UART_FORMAT_PAR_NONE 0x00
#define SET_UART_FORMAT_PAR_ODD 0x10
#define SET_UART_FORMAT_PAR_EVEN 0x30
#define SET_UART_FORMAT_PAR_MASK 0xD0
#define SET_UART_FORMAT_PAR_SPACE 0x90
#define GET_UART_STATUS_TYPE 0xc0
#define GET_UART_STATUS 0x22
#define GET_UART_STATUS_MSR 0x06
#define SET_UART_STATUS 0x40
#define SET_UART_STATUS_TYPE 0x23
#define SET_UART_STATUS_MCR 0x0004
#define SET_UART_STATUS_MCR_DTR 0x01
#define SET_UART_STATUS_MCR_RTS 0x02
#define SET_UART_STATUS_MCR_LOOP 0x10
#define SET_WORKING_MODE 0x40
#define SET_WORKING_MODE_TYPE 0x24
#define SET_WORKING_MODE_U2C 0x00
#define SET_WORKING_MODE_RS485 0x01
#define SET_WORKING_MODE_PDMA 0x02
#define SET_WORKING_MODE_SPP 0x03
#define SET_FLOWCTL_CHAR 0x40
#define SET_FLOWCTL_CHAR_TYPE 0x25
#define GET_VERSION 0xc0
#define GET_VERSION_TYPE 0x26
#define SET_REGISTER 0x40
#define SET_REGISTER_TYPE 0x27
#define GET_REGISTER 0xc0
#define GET_REGISTER_TYPE 0x28
#define SET_RAM 0x40
#define SET_RAM_TYPE 0x31
#define GET_RAM 0xc0
#define GET_RAM_TYPE 0x32
/* how come ??? */
#define UART_STATE 0x08
#define UART_STATE_TRANSIENT_MASK 0x74
#define UART_DCD 0x01
#define UART_DSR 0x02
#define UART_BREAK_ERROR 0x04
#define UART_RING 0x08
#define UART_FRAME_ERROR 0x10
#define UART_PARITY_ERROR 0x20
#define UART_OVERRUN_ERROR 0x40
#define UART_CTS 0x80
enum spcp8x5_type {
SPCP825_007_TYPE,
SPCP825_008_TYPE,
SPCP825_PHILIP_TYPE,
SPCP825_INTERMATIC_TYPE,
SPCP835_TYPE,
};
/* 1st in 1st out buffer 4 driver */
struct ringbuf {
unsigned int buf_size;
char *buf_buf;
char *buf_get;
char *buf_put;
};
/* alloc the ring buf and alloc the buffer itself */
static inline struct ringbuf *alloc_ringbuf(unsigned int size)
{
struct ringbuf *pb;
if (size == 0)
return NULL;
pb = kmalloc(sizeof(*pb), 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;
}
/* free the ring buf and the buffer itself */
static inline void free_ringbuf(struct ringbuf *pb)
{
if (pb != NULL) {
kfree(pb->buf_buf);
kfree(pb);
}
}
/* clear pipo , juest repoint the pointer here */
static inline void clear_ringbuf(struct ringbuf *pb)
{
if (pb != NULL)
pb->buf_get = pb->buf_put;
}
/* get the number of data in the pipo */
static inline unsigned int ringbuf_avail_data(struct ringbuf *pb)
{
if (pb == NULL)
return 0;
return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
}
/* get the number of space in the pipo */
static inline unsigned int ringbuf_avail_space(struct ringbuf *pb)
{
if (pb == NULL)
return 0;
return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
}
/* put count data into pipo */
static unsigned int put_ringbuf(struct ringbuf *pb, const char *buf,
unsigned int count)
{
unsigned int len;
if (pb == NULL)
return 0;
len = ringbuf_avail_space(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;
}
/* get count data from pipo */
static unsigned int get_ringbuf(struct ringbuf *pb, char *buf,
unsigned int count)
{
unsigned int len;
if (pb == NULL || buf == NULL)
return 0;
len = ringbuf_avail_data(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;
}
static struct usb_driver spcp8x5_driver = {
.name = "spcp8x5",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
.no_dynamic_id = 1,
};
struct spcp8x5_private {
spinlock_t lock;
struct ringbuf *buf;
int write_urb_in_use;
enum spcp8x5_type type;
wait_queue_head_t delta_msr_wait;
u8 line_control;
u8 line_status;
u8 termios_initialized;
};
/* desc : when device plug in,this function would be called.
* thanks to usb_serial subsystem,then do almost every things for us. And what
* we should do just alloc the buffer */
static int spcp8x5_startup(struct usb_serial *serial)
{
struct spcp8x5_private *priv;
int i;
enum spcp8x5_type type = SPCP825_007_TYPE;
u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
if (product == 0x0201)
type = SPCP825_007_TYPE;
else if (product == 0x0231)
type = SPCP835_TYPE;
else if (product == 0x0235)
type = SPCP825_008_TYPE;
else if (product == 0x0204)
type = SPCP825_INTERMATIC_TYPE;
else if (product == 0x0471 &&
serial->dev->descriptor.idVendor == cpu_to_le16(0x081e))
type = SPCP825_PHILIP_TYPE;
dev_dbg(&serial->dev->dev, "device type = %d\n", (int)type);
for (i = 0; i < serial->num_ports; ++i) {
priv = kzalloc(sizeof(struct spcp8x5_private), GFP_KERNEL);
if (!priv)
goto cleanup;
spin_lock_init(&priv->lock);
priv->buf = alloc_ringbuf(SPCP8x5_BUF_SIZE);
if (priv->buf == NULL)
goto cleanup2;
init_waitqueue_head(&priv->delta_msr_wait);
priv->type = type;
usb_set_serial_port_data(serial->port[i] , priv);
}
return 0;
cleanup2:
kfree(priv);
cleanup:
for (--i; i >= 0; --i) {
priv = usb_get_serial_port_data(serial->port[i]);
free_ringbuf(priv->buf);
kfree(priv);
usb_set_serial_port_data(serial->port[i] , NULL);
}
return -ENOMEM;
}
/* call when the device plug out. free all the memory alloced by probe */
static void spcp8x5_release(struct usb_serial *serial)
{
int i;
struct spcp8x5_private *priv;
for (i = 0; i < serial->num_ports; i++) {
priv = usb_get_serial_port_data(serial->port[i]);
if (priv) {
free_ringbuf(priv->buf);
kfree(priv);
}
}
}
/* set the modem control line of the device.
* NOTE spcp825-007 not supported this */
static int spcp8x5_set_ctrlLine(struct usb_device *dev, u8 value,
enum spcp8x5_type type)
{
int retval;
u8 mcr = 0 ;
if (type == SPCP825_007_TYPE)
return -EPERM;
mcr = (unsigned short)value;
retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
SET_UART_STATUS_TYPE, SET_UART_STATUS,
mcr, 0x04, NULL, 0, 100);
if (retval != 0)
dev_dbg(&dev->dev, "usb_control_msg return %#x\n", retval);
return retval;
}
/* get the modem status register of the device
* NOTE spcp825-007 not supported this */
static int spcp8x5_get_msr(struct usb_device *dev, u8 *status,
enum spcp8x5_type type)
{
u8 *status_buffer;
int ret;
/* I return Permited not support here but seem inval device
* is more fix */
if (type == SPCP825_007_TYPE)
return -EPERM;
if (status == NULL)
return -EINVAL;
status_buffer = kmalloc(1, GFP_KERNEL);
if (!status_buffer)
return -ENOMEM;
status_buffer[0] = status[0];
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
GET_UART_STATUS, GET_UART_STATUS_TYPE,
0, GET_UART_STATUS_MSR, status_buffer, 1, 100);
if (ret < 0)
dev_dbg(&dev->dev, "Get MSR = 0x%p failed (error = %d)",
status_buffer, ret);
dev_dbg(&dev->dev, "0xc0:0x22:0:6 %d - 0x%p ", ret, status_buffer);
status[0] = status_buffer[0];
kfree(status_buffer);
return ret;
}
/* select the work mode.
* NOTE this function not supported by spcp825-007 */
static void spcp8x5_set_workMode(struct usb_device *dev, u16 value,
u16 index, enum spcp8x5_type type)
{
int ret;
/* I return Permited not support here but seem inval device
* is more fix */
if (type == SPCP825_007_TYPE)
return;
ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
SET_WORKING_MODE_TYPE, SET_WORKING_MODE,
value, index, NULL, 0, 100);
dev_dbg(&dev->dev, "value = %#x , index = %#x\n", value, index);
if (ret < 0)
dev_dbg(&dev->dev,
"RTSCTS usb_control_msg(enable flowctrl) = %d\n", ret);
}
static int spcp8x5_carrier_raised(struct usb_serial_port *port)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
if (priv->line_status & MSR_STATUS_LINE_DCD)
return 1;
return 0;
}
static void spcp8x5_dtr_rts(struct usb_serial_port *port, int on)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
u8 control;
spin_lock_irqsave(&priv->lock, flags);
if (on)
priv->line_control = MCR_CONTROL_LINE_DTR
| MCR_CONTROL_LINE_RTS;
else
priv->line_control &= ~ (MCR_CONTROL_LINE_DTR
| MCR_CONTROL_LINE_RTS);
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type);
}
/* close the serial port. We should wait for data sending to device 1st and
* then kill all urb. */
static void spcp8x5_close(struct usb_serial_port *port)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
int result;
dbg("%s - port %d", __func__, port->number);
spin_lock_irqsave(&priv->lock, flags);
/* clear out any remaining data in the buffer */
clear_ringbuf(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
/* kill urb */
if (port->write_urb != NULL) {
result = usb_unlink_urb(port->write_urb);
if (result)
dev_dbg(&port->dev,
"usb_unlink_urb(write_urb) = %d\n", result);
}
result = usb_unlink_urb(port->read_urb);
if (result)
dev_dbg(&port->dev, "usb_unlink_urb(read_urb) = %d\n", result);
}
/* set the serial param for transfer. we should check if we really need to
* transfer. if we set flow control we should do this too. */
static void spcp8x5_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct usb_serial *serial = port->serial;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int cflag = tty->termios->c_cflag;
unsigned int old_cflag = old_termios->c_cflag;
unsigned short uartdata;
unsigned char buf[2] = {0, 0};
int baud;
int i;
u8 control;
/* for the 1st time call this function */
spin_lock_irqsave(&priv->lock, flags);
if (!priv->termios_initialized) {
*(tty->termios) = tty_std_termios;
tty->termios->c_cflag = B115200 | CS8 | CREAD | HUPCL | CLOCAL;
tty->termios->c_ispeed = 115200;
tty->termios->c_ospeed = 115200;
priv->termios_initialized = 1;
}
spin_unlock_irqrestore(&priv->lock, flags);
/* check that they really want us to change something */
if (!tty_termios_hw_change(tty->termios, old_termios))
return;
/* set DTR/RTS active */
spin_lock_irqsave(&priv->lock, flags);
control = priv->line_control;
if ((old_cflag & CBAUD) == B0) {
priv->line_control |= MCR_DTR;
if (!(old_cflag & CRTSCTS))
priv->line_control |= MCR_RTS;
}
if (control != priv->line_control) {
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
spcp8x5_set_ctrlLine(serial->dev, control , priv->type);
} else {
spin_unlock_irqrestore(&priv->lock, flags);
}
/* Set Baud Rate */
baud = tty_get_baud_rate(tty);;
switch (baud) {
case 300: buf[0] = 0x00; break;
case 600: buf[0] = 0x01; break;
case 1200: buf[0] = 0x02; break;
case 2400: buf[0] = 0x03; break;
case 4800: buf[0] = 0x04; break;
case 9600: buf[0] = 0x05; break;
case 19200: buf[0] = 0x07; break;
case 38400: buf[0] = 0x09; break;
case 57600: buf[0] = 0x0a; break;
case 115200: buf[0] = 0x0b; break;
case 230400: buf[0] = 0x0c; break;
case 460800: buf[0] = 0x0d; break;
case 921600: buf[0] = 0x0e; break;
/* case 1200000: buf[0] = 0x0f; break; */
/* case 2400000: buf[0] = 0x10; break; */
case 3000000: buf[0] = 0x11; break;
/* case 6000000: buf[0] = 0x12; break; */
case 0:
case 1000000:
buf[0] = 0x0b; break;
default:
dev_err(&port->dev, "spcp825 driver does not support the "
"baudrate requested, using default of 9600.\n");
}
/* Set Data Length : 00:5bit, 01:6bit, 10:7bit, 11:8bit */
if (cflag & CSIZE) {
switch (cflag & CSIZE) {
case CS5:
buf[1] |= SET_UART_FORMAT_SIZE_5;
break;
case CS6:
buf[1] |= SET_UART_FORMAT_SIZE_6;
break;
case CS7:
buf[1] |= SET_UART_FORMAT_SIZE_7;
break;
default:
case CS8:
buf[1] |= SET_UART_FORMAT_SIZE_8;
break;
}
}
/* Set Stop bit2 : 0:1bit 1:2bit */
buf[1] |= (cflag & CSTOPB) ? SET_UART_FORMAT_STOP_2 :
SET_UART_FORMAT_STOP_1;
/* Set Parity bit3-4 01:Odd 11:Even */
if (cflag & PARENB) {
buf[1] |= (cflag & PARODD) ?
SET_UART_FORMAT_PAR_ODD : SET_UART_FORMAT_PAR_EVEN ;
} else
buf[1] |= SET_UART_FORMAT_PAR_NONE;
uartdata = buf[0] | buf[1]<<8;
i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
SET_UART_FORMAT_TYPE, SET_UART_FORMAT,
uartdata, 0, NULL, 0, 100);
if (i < 0)
dev_err(&port->dev, "Set UART format %#x failed (error = %d)\n",
uartdata, i);
dbg("0x21:0x40:0:0 %d\n", i);
if (cflag & CRTSCTS) {
/* enable hardware flow control */
spcp8x5_set_workMode(serial->dev, 0x000a,
SET_WORKING_MODE_U2C, priv->type);
}
return;
}
/* open the serial port. do some usb system call. set termios and get the line
* status of the device. then submit the read urb */
static int spcp8x5_open(struct tty_struct *tty,
struct usb_serial_port *port, struct file *filp)
{
struct ktermios tmp_termios;
struct usb_serial *serial = port->serial;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
int ret;
unsigned long flags;
u8 status = 0x30;
/* status 0x30 means DSR and CTS = 1 other CDC RI and delta = 0 */
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);
ret = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
0x09, 0x00,
0x01, 0x00, NULL, 0x00, 100);
if (ret)
return ret;
spcp8x5_set_ctrlLine(serial->dev, priv->line_control , priv->type);
/* Setup termios */
if (tty)
spcp8x5_set_termios(tty, port, &tmp_termios);
spcp8x5_get_msr(serial->dev, &status, priv->type);
/* may be we should update uart status here but now we did not do */
spin_lock_irqsave(&priv->lock, flags);
priv->line_status = status & 0xf0 ;
spin_unlock_irqrestore(&priv->lock, flags);
/* FIXME: need to assert RTS and DTR if CRTSCTS off */
dbg("%s - submitting read urb", __func__);
port->read_urb->dev = serial->dev;
ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (ret) {
spcp8x5_close(port);
return -EPROTO;
}
port->port.drain_delay = 256;
return 0;
}
/* bulk read call back function. check the status of the urb. if transfer
* failed return. then update the status and the tty send data to tty subsys.
* submit urb again.
*/
static void spcp8x5_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
unsigned long flags;
int i;
int result = urb->status;
u8 status;
char tty_flag;
dev_dbg(&port->dev, "start, result = %d, urb->actual_length = %d\n,",
result, urb->actual_length);
/* check the urb status */
if (result) {
if (!port->port.count)
return;
if (result == -EPROTO) {
/* spcp8x5 mysteriously fails with -EPROTO */
/* reschedule the read */
urb->dev = port->serial->dev;
result = usb_submit_urb(urb , GFP_ATOMIC);
if (result)
dev_dbg(&port->dev,
"failed submitting read urb %d\n",
result);
return;
}
dev_dbg(&port->dev, "unable to handle the error, exiting.\n");
return;
}
/* get tty_flag from status */
tty_flag = TTY_NORMAL;
spin_lock_irqsave(&priv->lock, flags);
status = priv->line_status;
priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
spin_unlock_irqrestore(&priv->lock, flags);
/* wake up the wait for termios */
wake_up_interruptible(&priv->delta_msr_wait);
/* break takes precedence over parity, which takes precedence over
* framing errors */
if (status & UART_BREAK_ERROR)
tty_flag = TTY_BREAK;
else if (status & UART_PARITY_ERROR)
tty_flag = TTY_PARITY;
else if (status & UART_FRAME_ERROR)
tty_flag = TTY_FRAME;
dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
tty = tty_port_tty_get(&port->port);
if (tty && urb->actual_length) {
tty_buffer_request_room(tty, urb->actual_length + 1);
/* overrun is special, not associated with a char */
if (status & UART_OVERRUN_ERROR)
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
for (i = 0; i < urb->actual_length; ++i)
tty_insert_flip_char(tty, data[i], tty_flag);
tty_flip_buffer_push(tty);
}
tty_kref_put(tty);
/* Schedule the next read _if_ we are still open */
if (port->port.count) {
urb->dev = port->serial->dev;
result = usb_submit_urb(urb , GFP_ATOMIC);
if (result)
dev_dbg(&port->dev, "failed submitting read urb %d\n",
result);
}
return;
}
/* get data from ring buffer and then write to usb bus */
static void spcp8x5_send(struct usb_serial_port *port)
{
int count, result;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
if (priv->write_urb_in_use) {
dev_dbg(&port->dev, "write urb still used\n");
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
/* send the 1st urb for writting */
memset(port->write_urb->transfer_buffer , 0x00 , port->bulk_out_size);
count = get_ringbuf(priv->buf, port->write_urb->transfer_buffer,
port->bulk_out_size);
if (count == 0) {
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
/* update the urb status */
priv->write_urb_in_use = 1;
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) {
dev_dbg(&port->dev, "failed submitting write urb, error %d\n",
result);
priv->write_urb_in_use = 0;
/* TODO: reschedule spcp8x5_send */
}
schedule_work(&port->work);
}
/* this is the call back function for write urb. NOTE we should not sleep in
* this routine. check the urb return code and then submit the write urb again
* to hold the write loop */
static void spcp8x5_write_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
int result;
int status = urb->status;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(&port->dev, "urb shutting down with status: %d\n",
status);
priv->write_urb_in_use = 0;
return;
default:
/* error in the urb, so we have to resubmit it */
dbg("%s - Overflow in write", __func__);
dbg("%s - nonzero write bulk status received: %d",
__func__, status);
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_dbg(&port->dev,
"failed resubmitting write urb %d\n", result);
else
return;
}
priv->write_urb_in_use = 0;
/* send any buffered data */
spcp8x5_send(port);
}
/* write data to ring buffer. and then start the write transfer */
static int spcp8x5_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dev_dbg(&port->dev, "%d bytes\n", count);
if (!count)
return count;
spin_lock_irqsave(&priv->lock, flags);
count = put_ringbuf(priv->buf, buf, count);
spin_unlock_irqrestore(&priv->lock, flags);
spcp8x5_send(port);
return count;
}
static int spcp8x5_wait_modem_info(struct usb_serial_port *port,
unsigned int arg)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int prevstatus;
unsigned int status;
unsigned int changed;
spin_lock_irqsave(&priv->lock, flags);
prevstatus = priv->line_status;
spin_unlock_irqrestore(&priv->lock, flags);
while (1) {
/* wake up in bulk read */
interruptible_sleep_on(&priv->delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irqsave(&priv->lock, flags);
status = priv->line_status;
spin_unlock_irqrestore(&priv->lock, flags);
changed = prevstatus^status;
if (((arg & TIOCM_RNG) && (changed & MSR_STATUS_LINE_RI)) ||
((arg & TIOCM_DSR) && (changed & MSR_STATUS_LINE_DSR)) ||
((arg & TIOCM_CD) && (changed & MSR_STATUS_LINE_DCD)) ||
((arg & TIOCM_CTS) && (changed & MSR_STATUS_LINE_CTS)))
return 0;
prevstatus = status;
}
/* NOTREACHED */
return 0;
}
static int spcp8x5_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
switch (cmd) {
case TIOCMIWAIT:
dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
return spcp8x5_wait_modem_info(port, arg);
default:
dbg("%s not supported = 0x%04x", __func__, cmd);
break;
}
return -ENOIOCTLCMD;
}
static int spcp8x5_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
u8 control;
spin_lock_irqsave(&priv->lock, flags);
if (set & TIOCM_RTS)
priv->line_control |= MCR_RTS;
if (set & TIOCM_DTR)
priv->line_control |= MCR_DTR;
if (clear & TIOCM_RTS)
priv->line_control &= ~MCR_RTS;
if (clear & TIOCM_DTR)
priv->line_control &= ~MCR_DTR;
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
return spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type);
}
static int spcp8x5_tiocmget(struct tty_struct *tty, struct file *file)
{
struct usb_serial_port *port = tty->driver_data;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int mcr;
unsigned int status;
unsigned int result;
spin_lock_irqsave(&priv->lock, flags);
mcr = priv->line_control;
status = priv->line_status;
spin_unlock_irqrestore(&priv->lock, flags);
result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
| ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
| ((status & MSR_STATUS_LINE_CTS) ? TIOCM_CTS : 0)
| ((status & MSR_STATUS_LINE_DSR) ? TIOCM_DSR : 0)
| ((status & MSR_STATUS_LINE_RI) ? TIOCM_RI : 0)
| ((status & MSR_STATUS_LINE_DCD) ? TIOCM_CD : 0);
return result;
}
/* get the avail space room in ring buffer */
static int spcp8x5_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
int room = 0;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
room = ringbuf_avail_space(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
return room;
}
/* get the number of avail data in write ring buffer */
static int spcp8x5_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
int chars = 0;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
chars = ringbuf_avail_data(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
return chars;
}
/* All of the device info needed for the spcp8x5 SIO serial converter */
static struct usb_serial_driver spcp8x5_device = {
.driver = {
.owner = THIS_MODULE,
.name = "SPCP8x5",
},
.id_table = id_table,
.num_ports = 1,
.open = spcp8x5_open,
.close = spcp8x5_close,
.dtr_rts = spcp8x5_dtr_rts,
.carrier_raised = spcp8x5_carrier_raised,
.write = spcp8x5_write,
.set_termios = spcp8x5_set_termios,
.ioctl = spcp8x5_ioctl,
.tiocmget = spcp8x5_tiocmget,
.tiocmset = spcp8x5_tiocmset,
.write_room = spcp8x5_write_room,
.read_bulk_callback = spcp8x5_read_bulk_callback,
.write_bulk_callback = spcp8x5_write_bulk_callback,
.chars_in_buffer = spcp8x5_chars_in_buffer,
.attach = spcp8x5_startup,
.release = spcp8x5_release,
};
static int __init spcp8x5_init(void)
{
int retval;
retval = usb_serial_register(&spcp8x5_device);
if (retval)
goto failed_usb_serial_register;
retval = usb_register(&spcp8x5_driver);
if (retval)
goto failed_usb_register;
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
DRIVER_DESC "\n");
return 0;
failed_usb_register:
usb_serial_deregister(&spcp8x5_device);
failed_usb_serial_register:
return retval;
}
static void __exit spcp8x5_exit(void)
{
usb_deregister(&spcp8x5_driver);
usb_serial_deregister(&spcp8x5_device);
}
module_init(spcp8x5_init);
module_exit(spcp8x5_exit);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");