diff options
Diffstat (limited to 'drivers/usb/serial/pl2303.c')
| -rw-r--r-- | drivers/usb/serial/pl2303.c | 330 |
1 files changed, 4 insertions, 326 deletions
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c index 77e968045f75..28037c1af93e 100644 --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -40,16 +40,6 @@ static int debug; #define PL2303_CLOSING_WAIT (30*HZ) -#define PL2303_BUF_SIZE 1024 -#define PL2303_TMP_BUF_SIZE 1024 - -struct pl2303_buf { - unsigned int buf_size; - char *buf_buf; - char *buf_get; - char *buf_put; -}; - static const struct usb_device_id id_table[] = { { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) }, { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) }, @@ -157,173 +147,12 @@ enum pl2303_type { struct pl2303_private { spinlock_t lock; - struct pl2303_buf *buf; - int write_urb_in_use; wait_queue_head_t delta_msr_wait; u8 line_control; u8 line_status; enum pl2303_type type; }; -/* - * pl2303_buf_alloc - * - * Allocate a circular buffer and all associated memory. - */ -static struct pl2303_buf *pl2303_buf_alloc(unsigned int size) -{ - struct pl2303_buf *pb; - - if (size == 0) - return NULL; - - pb = kmalloc(sizeof(struct pl2303_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; -} - -/* - * pl2303_buf_free - * - * Free the buffer and all associated memory. - */ -static void pl2303_buf_free(struct pl2303_buf *pb) -{ - if (pb) { - kfree(pb->buf_buf); - kfree(pb); - } -} - -/* - * pl2303_buf_clear - * - * Clear out all data in the circular buffer. - */ -static void pl2303_buf_clear(struct pl2303_buf *pb) -{ - if (pb != NULL) - pb->buf_get = pb->buf_put; - /* equivalent to a get of all data available */ -} - -/* - * pl2303_buf_data_avail - * - * Return the number of bytes of data available in the circular - * buffer. - */ -static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb) -{ - if (pb == NULL) - return 0; - - return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size; -} - -/* - * pl2303_buf_space_avail - * - * Return the number of bytes of space available in the circular - * buffer. - */ -static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb) -{ - if (pb == NULL) - return 0; - - return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size; -} - -/* - * pl2303_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 pl2303_buf_put(struct pl2303_buf *pb, const char *buf, - unsigned int count) -{ - unsigned int len; - - if (pb == NULL) - return 0; - - len = pl2303_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; -} - -/* - * pl2303_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 pl2303_buf_get(struct pl2303_buf *pb, char *buf, - unsigned int count) -{ - unsigned int len; - - if (pb == NULL) - return 0; - - len = pl2303_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; -} - static int pl2303_vendor_read(__u16 value, __u16 index, struct usb_serial *serial, unsigned char *buf) { @@ -372,11 +201,6 @@ static int pl2303_startup(struct usb_serial *serial) if (!priv) goto cleanup; spin_lock_init(&priv->lock); - priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE); - if (priv->buf == NULL) { - kfree(priv); - goto cleanup; - } init_waitqueue_head(&priv->delta_msr_wait); priv->type = type; usb_set_serial_port_data(serial->port[i], priv); @@ -404,7 +228,6 @@ cleanup: kfree(buf); for (--i; i >= 0; --i) { priv = usb_get_serial_port_data(serial->port[i]); - pl2303_buf_free(priv->buf); kfree(priv); usb_set_serial_port_data(serial->port[i], NULL); } @@ -422,102 +245,6 @@ static int set_control_lines(struct usb_device *dev, u8 value) return retval; } -static void pl2303_send(struct usb_serial_port *port) -{ - int count, result; - struct pl2303_private *priv = usb_get_serial_port_data(port); - unsigned long flags; - - dbg("%s - port %d", __func__, port->number); - - spin_lock_irqsave(&priv->lock, flags); - - if (priv->write_urb_in_use) { - spin_unlock_irqrestore(&priv->lock, flags); - return; - } - - count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer, - port->bulk_out_size); - - if (count == 0) { - spin_unlock_irqrestore(&priv->lock, flags); - return; - } - - priv->write_urb_in_use = 1; - - spin_unlock_irqrestore(&priv->lock, flags); - - usb_serial_debug_data(debug, &port->dev, __func__, count, - port->write_urb->transfer_buffer); - - port->write_urb->transfer_buffer_length = count; - result = usb_submit_urb(port->write_urb, GFP_ATOMIC); - if (result) { - dev_err(&port->dev, "%s - failed submitting write urb," - " error %d\n", __func__, result); - priv->write_urb_in_use = 0; - /* TODO: reschedule pl2303_send */ - } - - usb_serial_port_softint(port); -} - -static int pl2303_write(struct tty_struct *tty, struct usb_serial_port *port, - const unsigned char *buf, int count) -{ - struct pl2303_private *priv = usb_get_serial_port_data(port); - unsigned long flags; - - dbg("%s - port %d, %d bytes", __func__, port->number, count); - - if (!count) - return count; - - spin_lock_irqsave(&priv->lock, flags); - count = pl2303_buf_put(priv->buf, buf, count); - spin_unlock_irqrestore(&priv->lock, flags); - - pl2303_send(port); - - return count; -} - -static int pl2303_write_room(struct tty_struct *tty) -{ - struct usb_serial_port *port = tty->driver_data; - struct pl2303_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 = pl2303_buf_space_avail(priv->buf); - spin_unlock_irqrestore(&priv->lock, flags); - - dbg("%s - returns %d", __func__, room); - return room; -} - -static int pl2303_chars_in_buffer(struct tty_struct *tty) -{ - struct usb_serial_port *port = tty->driver_data; - struct pl2303_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 = pl2303_buf_data_avail(priv->buf); - spin_unlock_irqrestore(&priv->lock, flags); - - dbg("%s - returns %d", __func__, chars); - return chars; -} - static void pl2303_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { @@ -729,15 +456,14 @@ static void pl2303_dtr_rts(struct usb_serial_port *port, int on) static void pl2303_close(struct usb_serial_port *port) { - struct pl2303_private *priv = usb_get_serial_port_data(port); unsigned long flags; dbg("%s - port %d", __func__, port->number); - spin_lock_irqsave(&priv->lock, flags); + spin_lock_irqsave(&port->lock, flags); /* clear out any remaining data in the buffer */ - pl2303_buf_clear(priv->buf); - spin_unlock_irqrestore(&priv->lock, flags); + kfifo_reset_out(&port->write_fifo); + spin_unlock_irqrestore(&port->lock, flags); /* shutdown our urbs */ dbg("%s - shutting down urbs", __func__); @@ -951,10 +677,7 @@ static void pl2303_release(struct usb_serial *serial) for (i = 0; i < serial->num_ports; ++i) { priv = usb_get_serial_port_data(serial->port[i]); - if (priv) { - pl2303_buf_free(priv->buf); - kfree(priv); - } + kfree(priv); } } @@ -1086,47 +809,6 @@ static void pl2303_process_read_urb(struct urb *urb) tty_kref_put(tty); } -static void pl2303_write_bulk_callback(struct urb *urb) -{ - struct usb_serial_port *port = urb->context; - struct pl2303_private *priv = usb_get_serial_port_data(port); - int result; - int status = urb->status; - - dbg("%s - port %d", __func__, port->number); - - 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->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; - result = usb_submit_urb(port->write_urb, GFP_ATOMIC); - if (result) - dev_err(&urb->dev->dev, "%s - failed resubmitting write" - " urb, error %d\n", __func__, result); - else - return; - } - - priv->write_urb_in_use = 0; - - /* send any buffered data */ - pl2303_send(port); -} - /* All of the device info needed for the PL2303 SIO serial converter */ static struct usb_serial_driver pl2303_device = { .driver = { @@ -1142,7 +824,6 @@ static struct usb_serial_driver pl2303_device = { .close = pl2303_close, .dtr_rts = pl2303_dtr_rts, .carrier_raised = pl2303_carrier_raised, - .write = pl2303_write, .ioctl = pl2303_ioctl, .break_ctl = pl2303_break_ctl, .set_termios = pl2303_set_termios, @@ -1150,9 +831,6 @@ static struct usb_serial_driver pl2303_device = { .tiocmset = pl2303_tiocmset, .process_read_urb = pl2303_process_read_urb, .read_int_callback = pl2303_read_int_callback, - .write_bulk_callback = pl2303_write_bulk_callback, - .write_room = pl2303_write_room, - .chars_in_buffer = pl2303_chars_in_buffer, .attach = pl2303_startup, .release = pl2303_release, }; |