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Commit fa993ca8 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: spcp8x5: reimplement using generic framework 

Kill custom fifo, read, and single-urb write implementations.

Compile-only tested.
Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 6b6962f9
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Showing with 29 additions and 378 deletions
drivers/usb/serial/spcp8x5.c
View file @ fa993ca8
/*
* spcp8x5 USB to serial adaptor driver
*
* Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
* Copyright (C) 2006 Linxb (xubin.lin@worldplus.com.cn)
* Copyright (C) 2006 S1 Corp.
*
......@@ -29,7 +30,7 @@
/* Version Information */
#define DRIVER_VERSION "v0.04"
#define DRIVER_VERSION "v0.10"
#define DRIVER_DESC "SPCP8x5 USB to serial adaptor driver"
static int debug;
......@@ -64,11 +65,6 @@ struct spcp8x5_usb_ctrl_arg {
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
......@@ -155,133 +151,6 @@ enum spcp8x5_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,
......@@ -293,8 +162,6 @@ static struct usb_driver spcp8x5_driver = {
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;
......@@ -330,24 +197,15 @@ static int spcp8x5_startup(struct usb_serial *serial)
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);
}
......@@ -358,15 +216,9 @@ static int spcp8x5_startup(struct usb_serial *serial)
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);
}
}
for (i = 0; i < serial->num_ports; i++)
kfree(usb_get_serial_port_data(serial->port[i]));
}
/* set the modem control line of the device.
......@@ -470,33 +322,6 @@ static void spcp8x5_dtr_rts(struct usb_serial_port *port, int on)
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);
}
static void spcp8x5_init_termios(struct tty_struct *tty)
{
/* for the 1st time call this function */
......@@ -620,7 +445,7 @@ static void spcp8x5_set_termios(struct tty_struct *tty,
}
/* open the serial port. do some usb system call. set termios and get the line
* status of the device. then submit the read urb */
* status of the device. */
static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct ktermios tmp_termios;
......@@ -655,52 +480,21 @@ static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port)
priv->line_status = status & 0xf0 ;
spin_unlock_irqrestore(&priv->lock, flags);
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;
return usb_serial_generic_open(tty, port);
}
/* 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)
static void spcp8x5_process_read_urb(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 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 (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;
......@@ -711,8 +505,16 @@ static void spcp8x5_read_bulk_callback(struct urb *urb)
/* 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 (!urb->actual_length)
return;
tty = tty_port_tty_get(&port->port);
if (!tty)
return;
if (status & UART_STATE_TRANSIENT_MASK) {
/* 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)
......@@ -721,131 +523,15 @@ static void spcp8x5_read_bulk_callback(struct urb *urb)
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) {
/* overrun is special, not associated with a char */
if (status & UART_OVERRUN_ERROR)
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
tty_insert_flip_string_fixed_flag(tty, data, tty_flag,
urb->actual_length);
tty_flip_buffer_push(tty);
}
tty_kref_put(tty);
/* Schedule the next 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);
}
/* 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,
......@@ -953,36 +639,6 @@ static int spcp8x5_tiocmget(struct tty_struct *tty, struct file *file)
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 = {
......@@ -992,21 +648,16 @@ static struct usb_serial_driver spcp8x5_device = {
.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,
.init_termios = spcp8x5_init_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,
.process_read_urb = spcp8x5_process_read_urb,
};
static int __init spcp8x5_init(void)
......
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