/*
* 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.
*
/* Version Information */
-#define DRIVER_VERSION "v0.04"
+#define DRIVER_VERSION "v0.10"
#define DRIVER_DESC "SPCP8x5 USB to serial adaptor driver"
static int debug;
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
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,
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;
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);
}
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.
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 */
}
/* 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;
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;
/* 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) {
- /* 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);
+ if (!urb->actual_length)
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);
+ tty = tty_port_tty_get(&port->port);
+ if (!tty)
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;
+ 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)
+ tty_flag = TTY_PARITY;
+ else if (status & UART_FRAME_ERROR)
+ tty_flag = TTY_FRAME;
+ dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
- 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;
+ /* overrun is special, not associated with a char */
+ if (status & UART_OVERRUN_ERROR)
+ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
- 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;
+ tty_insert_flip_string_fixed_flag(tty, data, tty_flag,
+ urb->actual_length);
+ tty_flip_buffer_push(tty);
+ tty_kref_put(tty);
}
static int spcp8x5_wait_modem_info(struct usb_serial_port *port,
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 = {
.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)
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff