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USB: cypress_m8: use kfifo to implement write buffering
Kill custom fifo implementation. Note that cypress_m8 has no port write fifo as it has no bulk-out endpoint. Compile-only tested. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Johan Hovold
Greg Kroah-Hartman
parent
c4f4736fc4
commit
117fb8d086
@ -64,6 +64,7 @@
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/serial.h>
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#include <linux/kfifo.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include <asm/unaligned.h>
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@ -79,7 +80,7 @@ static int unstable_bauds;
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.09"
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#define DRIVER_VERSION "v1.10"
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#define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
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#define DRIVER_DESC "Cypress USB to Serial Driver"
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@ -134,7 +135,7 @@ struct cypress_private {
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int bytes_out; /* used for statistics */
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int cmd_count; /* used for statistics */
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int cmd_ctrl; /* always set this to 1 before issuing a command */
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struct cypress_buf *buf; /* write buffer */
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struct kfifo write_fifo; /* write fifo */
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int write_urb_in_use; /* write urb in use indicator */
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int write_urb_interval; /* interval to use for write urb */
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int read_urb_interval; /* interval to use for read urb */
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@ -156,14 +157,6 @@ struct cypress_private {
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struct ktermios tmp_termios; /* stores the old termios settings */
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};
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/* write buffer structure */
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struct cypress_buf {
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unsigned int buf_size;
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char *buf_buf;
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char *buf_get;
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char *buf_put;
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};
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/* function prototypes for the Cypress USB to serial device */
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static int cypress_earthmate_startup(struct usb_serial *serial);
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static int cypress_hidcom_startup(struct usb_serial *serial);
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@ -189,17 +182,6 @@ static void cypress_unthrottle(struct tty_struct *tty);
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static void cypress_set_dead(struct usb_serial_port *port);
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static void cypress_read_int_callback(struct urb *urb);
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static void cypress_write_int_callback(struct urb *urb);
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/* write buffer functions */
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static struct cypress_buf *cypress_buf_alloc(unsigned int size);
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static void cypress_buf_free(struct cypress_buf *cb);
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static void cypress_buf_clear(struct cypress_buf *cb);
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static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
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static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
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static unsigned int cypress_buf_put(struct cypress_buf *cb,
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const char *buf, unsigned int count);
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static unsigned int cypress_buf_get(struct cypress_buf *cb,
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char *buf, unsigned int count);
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static struct usb_serial_driver cypress_earthmate_device = {
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.driver = {
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@ -502,8 +484,7 @@ static int generic_startup(struct usb_serial *serial)
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priv->comm_is_ok = !0;
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spin_lock_init(&priv->lock);
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priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
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if (priv->buf == NULL) {
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if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
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kfree(priv);
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return -ENOMEM;
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}
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@ -626,7 +607,7 @@ static void cypress_release(struct usb_serial *serial)
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priv = usb_get_serial_port_data(serial->port[0]);
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if (priv) {
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cypress_buf_free(priv->buf);
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kfifo_free(&priv->write_fifo);
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kfree(priv);
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}
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}
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@ -703,6 +684,7 @@ static void cypress_dtr_rts(struct usb_serial_port *port, int on)
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static void cypress_close(struct usb_serial_port *port)
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{
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struct cypress_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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dbg("%s - port %d", __func__, port->number);
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@ -712,12 +694,14 @@ static void cypress_close(struct usb_serial_port *port)
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mutex_unlock(&port->serial->disc_mutex);
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return;
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}
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cypress_buf_clear(priv->buf);
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spin_lock_irqsave(&priv->lock, flags);
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kfifo_reset_out(&priv->write_fifo);
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spin_unlock_irqrestore(&priv->lock, flags);
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dbg("%s - stopping urbs", __func__);
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usb_kill_urb(port->interrupt_in_urb);
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usb_kill_urb(port->interrupt_out_urb);
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if (stats)
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dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
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priv->bytes_in, priv->bytes_out, priv->cmd_count);
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@ -729,7 +713,6 @@ static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
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const unsigned char *buf, int count)
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{
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struct cypress_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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dbg("%s - port %d, %d bytes", __func__, port->number, count);
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@ -744,9 +727,7 @@ static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
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if (!count)
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return count;
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spin_lock_irqsave(&priv->lock, flags);
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count = cypress_buf_put(priv->buf, buf, count);
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spin_unlock_irqrestore(&priv->lock, flags);
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count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
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finish:
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cypress_send(port);
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@ -806,9 +787,10 @@ static void cypress_send(struct usb_serial_port *port)
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} else
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spin_unlock_irqrestore(&priv->lock, flags);
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count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
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port->interrupt_out_size-offset);
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count = kfifo_out_locked(&priv->write_fifo,
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&port->interrupt_out_buffer[offset],
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port->interrupt_out_size - offset,
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&priv->lock);
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if (count == 0)
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return;
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@ -874,7 +856,7 @@ static int cypress_write_room(struct tty_struct *tty)
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dbg("%s - port %d", __func__, port->number);
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spin_lock_irqsave(&priv->lock, flags);
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room = cypress_buf_space_avail(priv->buf);
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room = kfifo_avail(&priv->write_fifo);
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spin_unlock_irqrestore(&priv->lock, flags);
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dbg("%s - returns %d", __func__, room);
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@ -1142,7 +1124,7 @@ static int cypress_chars_in_buffer(struct tty_struct *tty)
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dbg("%s - port %d", __func__, port->number);
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spin_lock_irqsave(&priv->lock, flags);
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chars = cypress_buf_data_avail(priv->buf);
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chars = kfifo_len(&priv->write_fifo);
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spin_unlock_irqrestore(&priv->lock, flags);
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dbg("%s - returns %d", __func__, chars);
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@ -1395,193 +1377,6 @@ static void cypress_write_int_callback(struct urb *urb)
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}
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/*****************************************************************************
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* Write buffer functions - buffering code from pl2303 used
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*****************************************************************************/
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/*
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* cypress_buf_alloc
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*
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* Allocate a circular buffer and all associated memory.
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*/
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static struct cypress_buf *cypress_buf_alloc(unsigned int size)
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{
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struct cypress_buf *cb;
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if (size == 0)
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return NULL;
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cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
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if (cb == NULL)
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return NULL;
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cb->buf_buf = kmalloc(size, GFP_KERNEL);
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if (cb->buf_buf == NULL) {
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kfree(cb);
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return NULL;
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}
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cb->buf_size = size;
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cb->buf_get = cb->buf_put = cb->buf_buf;
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return cb;
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}
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/*
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* cypress_buf_free
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*
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* Free the buffer and all associated memory.
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*/
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static void cypress_buf_free(struct cypress_buf *cb)
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{
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if (cb) {
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kfree(cb->buf_buf);
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kfree(cb);
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}
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}
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/*
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* cypress_buf_clear
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*
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* Clear out all data in the circular buffer.
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*/
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static void cypress_buf_clear(struct cypress_buf *cb)
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{
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if (cb != NULL)
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cb->buf_get = cb->buf_put;
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/* equivalent to a get of all data available */
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}
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/*
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* cypress_buf_data_avail
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*
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* Return the number of bytes of data available in the circular
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* buffer.
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*/
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static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
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{
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if (cb != NULL)
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return (cb->buf_size + cb->buf_put - cb->buf_get)
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% cb->buf_size;
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else
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return 0;
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}
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/*
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* cypress_buf_space_avail
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*
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* Return the number of bytes of space available in the circular
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* buffer.
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*/
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static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
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{
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if (cb != NULL)
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return (cb->buf_size + cb->buf_get - cb->buf_put - 1)
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% cb->buf_size;
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else
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return 0;
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}
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/*
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* cypress_buf_put
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*
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* Copy data data from a user buffer and put it into the circular buffer.
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* Restrict to the amount of space available.
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*
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* Return the number of bytes copied.
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*/
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static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
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unsigned int count)
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{
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unsigned int len;
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if (cb == NULL)
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return 0;
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len = cypress_buf_space_avail(cb);
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if (count > len)
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count = len;
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if (count == 0)
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return 0;
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len = cb->buf_buf + cb->buf_size - cb->buf_put;
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if (count > len) {
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memcpy(cb->buf_put, buf, len);
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memcpy(cb->buf_buf, buf+len, count - len);
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cb->buf_put = cb->buf_buf + count - len;
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} else {
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memcpy(cb->buf_put, buf, count);
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if (count < len)
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cb->buf_put += count;
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else /* count == len */
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cb->buf_put = cb->buf_buf;
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}
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return count;
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}
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/*
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* cypress_buf_get
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*
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* Get data from the circular buffer and copy to the given buffer.
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* Restrict to the amount of data available.
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*
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* Return the number of bytes copied.
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*/
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static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
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unsigned int count)
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{
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unsigned int len;
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if (cb == NULL)
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return 0;
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len = cypress_buf_data_avail(cb);
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if (count > len)
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count = len;
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if (count == 0)
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return 0;
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len = cb->buf_buf + cb->buf_size - cb->buf_get;
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if (count > len) {
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memcpy(buf, cb->buf_get, len);
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memcpy(buf+len, cb->buf_buf, count - len);
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cb->buf_get = cb->buf_buf + count - len;
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} else {
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memcpy(buf, cb->buf_get, count);
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if (count < len)
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cb->buf_get += count;
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else /* count == len */
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cb->buf_get = cb->buf_buf;
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}
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return count;
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}
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/*****************************************************************************
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* Module functions
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*****************************************************************************/
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