/*
* 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_shutdown(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);
usb_set_serial_port_data(serial->port[i] , NULL);
}
}
}
/* 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);
}
/* close the serial port. We should wait for data sending to device 1st and
* then kill all urb. */
static void spcp8x5_close(struct tty_struct *tty,
struct usb_serial_port *port, struct file *filp)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int c_cflag;
int bps;
long timeout;
wait_queue_t wait;
int result;
dbg("%s - port %d", __func__, port->number);
/* wait for data to drain from the buffer */
spin_lock_irqsave(&priv->lock, flags);
timeout = SPCP8x5_CLOSING_WAIT;
init_waitqueue_entry(&wait, current);
add_wait_queue(&tty->write_wait, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (ringbuf_avail_data(priv->buf) == 0 ||
timeout == 0 || signal_pending(current))
break;
spin_unlock_irqrestore(&priv->lock, flags);
timeout = schedule_timeout(timeout);
spin_lock_irqsave(&priv->lock, flags);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&tty->write_wait, &wait);
/* clear out any remaining data in the buffer */
clear_ringbuf(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
/* wait for characters to drain from the device (this is long enough
* for the entire all byte spcp8x5 hardware buffer to drain with no
* flow control for data rates of 1200 bps or more, for lower rates we
* should really know how much data is in the buffer to compute a delay
* that is not unnecessarily long) */
bps = tty_get_baud_rate(tty);
if (bps > 1200)
timeout = max((HZ*2560) / bps, HZ/10);
else
timeout = 2*HZ;
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(timeout);
/* clear control lines */
if (tty) {
c_cflag = tty->termios->c_cflag;
if (c_cflag & HUPCL) {
spin_lock_irqsave(&priv->lock, flags);
priv->line_control = 0;
spin_unlock_irqrestore(&priv->lock, flags);
spcp8x5_set_ctrlLine(port->serial->dev, 0 , priv->type);
}
}
/* 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;
spin_lock_irqsave(&priv->lock, flags);
if (tty && (tty->termios->c_cflag & CBAUD))
priv->line_control = MCR_DTR | MCR_RTS;
else
priv->line_control = 0;
spin_unlock_irqrestore(&priv->lock, flags);
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(tty, port, NULL);
return -EPROTO;
}
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;
u8 status = 0;
char tty_flag;
dev_dbg(&port->dev, "start, urb->status = %d, "
"urb->actual_length = %d\n,", urb->status, urb->actual_length);
/* check the urb status */
if (urb->status) {
if (!port->port.count)
return;
if (urb->status == -EPROTO) {
/* spcp8x5 mysteriously fails with -EPROTO */
/* reschedule the read */
urb->status = 0;
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;
switch (urb->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",
urb->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__, urb->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,
.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,
.shutdown = spcp8x5_shutdown,
};
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");
