USB: aircable: rewrite using generic read and write implementations
Kill circular buffers for tx and rx as well as read work thread, and switch to generic kfifo-based write implementation. This is an example of how prepare_write_buffer and process_read_urb can be used to handle protocols with packet headers. Please note the diffstat which shows that the same functionality is now provided using only a tenth of the code (including whitespace and comments, though). Tested-by: Naranjo, Manuel Francisco <naranjo.manuel@gmail.com> 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
Родитель
e877048417
Коммит
4272568b3d
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@ -1,7 +1,9 @@
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/*
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* AIRcable USB Bluetooth Dongle Driver.
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*
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* Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
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* Copyright (C) 2006 Manuel Francisco Naranjo (naranjo.manuel@gmail.com)
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation.
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@ -42,10 +44,10 @@
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*
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*/
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#include <asm/unaligned.h>
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#include <linux/tty.h>
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#include <linux/slab.h>
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#include <linux/tty_flip.h>
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#include <linux/circ_buf.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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@ -55,16 +57,12 @@ static int debug;
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#define AIRCABLE_VID 0x16CA
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#define AIRCABLE_USB_PID 0x1502
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/* write buffer size defines */
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#define AIRCABLE_BUF_SIZE 2048
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/* Protocol Stuff */
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#define HCI_HEADER_LENGTH 0x4
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#define TX_HEADER_0 0x20
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#define TX_HEADER_1 0x29
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#define RX_HEADER_0 0x00
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#define RX_HEADER_1 0x20
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#define MAX_HCI_FRAMESIZE 60
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#define HCI_COMPLETE_FRAME 64
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/* rx_flags */
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@ -74,8 +72,8 @@ static int debug;
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.0b2"
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#define DRIVER_AUTHOR "Naranjo, Manuel Francisco <naranjo.manuel@gmail.com>"
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#define DRIVER_VERSION "v2.0"
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#define DRIVER_AUTHOR "Naranjo, Manuel Francisco <naranjo.manuel@gmail.com>, Johan Hovold <jhovold@gmail.com>"
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#define DRIVER_DESC "AIRcable USB Driver"
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/* ID table that will be registered with USB core */
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@ -85,226 +83,20 @@ static const struct usb_device_id id_table[] = {
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* Internal Structure */
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struct aircable_private {
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spinlock_t rx_lock; /* spinlock for the receive lines */
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struct circ_buf *tx_buf; /* write buffer */
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struct circ_buf *rx_buf; /* read buffer */
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int rx_flags; /* for throttilng */
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struct work_struct rx_work; /* work cue for the receiving line */
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struct usb_serial_port *port; /* USB port with which associated */
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};
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/* Private methods */
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/* Circular Buffer Methods, code from ti_usb_3410_5052 used */
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/*
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* serial_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 serial_buf_clear(struct circ_buf *cb)
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static int aircable_prepare_write_buffer(struct usb_serial_port *port,
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void **dest, size_t size, const void *src, size_t count)
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{
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cb->head = cb->tail = 0;
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}
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/*
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* serial_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 circ_buf *serial_buf_alloc(void)
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{
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struct circ_buf *cb;
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cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
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if (cb == NULL)
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return NULL;
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cb->buf = kmalloc(AIRCABLE_BUF_SIZE, GFP_KERNEL);
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if (cb->buf == NULL) {
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kfree(cb);
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return NULL;
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}
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serial_buf_clear(cb);
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return cb;
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}
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/*
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* serial_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 serial_buf_free(struct circ_buf *cb)
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{
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kfree(cb->buf);
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kfree(cb);
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}
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/*
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* serial_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 int serial_buf_data_avail(struct circ_buf *cb)
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{
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return CIRC_CNT(cb->head, cb->tail, AIRCABLE_BUF_SIZE);
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}
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/*
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* serial_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 int serial_buf_put(struct circ_buf *cb, const char *buf, int count)
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{
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int c, ret = 0;
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while (1) {
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c = CIRC_SPACE_TO_END(cb->head, cb->tail, AIRCABLE_BUF_SIZE);
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if (count < c)
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c = count;
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if (c <= 0)
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break;
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memcpy(cb->buf + cb->head, buf, c);
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cb->head = (cb->head + c) & (AIRCABLE_BUF_SIZE-1);
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buf += c;
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count -= c;
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ret = c;
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}
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return ret;
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}
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/*
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* serial_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 int serial_buf_get(struct circ_buf *cb, char *buf, int count)
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{
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int c, ret = 0;
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while (1) {
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c = CIRC_CNT_TO_END(cb->head, cb->tail, AIRCABLE_BUF_SIZE);
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if (count < c)
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c = count;
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if (c <= 0)
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break;
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memcpy(buf, cb->buf + cb->tail, c);
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cb->tail = (cb->tail + c) & (AIRCABLE_BUF_SIZE-1);
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buf += c;
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count -= c;
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ret = c;
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}
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return ret;
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}
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/* End of circula buffer methods */
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static void aircable_send(struct usb_serial_port *port)
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{
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int count, result;
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struct aircable_private *priv = usb_get_serial_port_data(port);
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unsigned char *buf;
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__le16 *dbuf;
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dbg("%s - port %d", __func__, port->number);
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if (port->write_urb_busy)
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return;
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count = min(serial_buf_data_avail(priv->tx_buf), MAX_HCI_FRAMESIZE);
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if (count == 0)
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return;
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buf = kzalloc(count + HCI_HEADER_LENGTH, GFP_ATOMIC);
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if (!buf) {
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dev_err(&port->dev, "%s- kzalloc(%d) failed.\n",
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__func__, count + HCI_HEADER_LENGTH);
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return;
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}
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unsigned char *buf = *dest;
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count = kfifo_out_locked(&port->write_fifo, buf + HCI_HEADER_LENGTH,
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size - HCI_HEADER_LENGTH, &port->lock);
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buf[0] = TX_HEADER_0;
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buf[1] = TX_HEADER_1;
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dbuf = (__le16 *)&buf[2];
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*dbuf = cpu_to_le16((u16)count);
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serial_buf_get(priv->tx_buf, buf + HCI_HEADER_LENGTH,
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MAX_HCI_FRAMESIZE);
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put_unaligned_le16(count, &buf[2]);
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memcpy(port->write_urb->transfer_buffer, buf,
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count + HCI_HEADER_LENGTH);
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kfree(buf);
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port->write_urb_busy = 1;
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usb_serial_debug_data(debug, &port->dev, __func__,
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count + HCI_HEADER_LENGTH,
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port->write_urb->transfer_buffer);
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port->write_urb->transfer_buffer_length = count + HCI_HEADER_LENGTH;
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port->write_urb->dev = port->serial->dev;
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result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
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if (result) {
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dev_err(&port->dev,
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"%s - failed submitting write urb, error %d\n",
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__func__, result);
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port->write_urb_busy = 0;
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}
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schedule_work(&port->work);
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return count;
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}
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static void aircable_read(struct work_struct *work)
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{
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struct aircable_private *priv =
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container_of(work, struct aircable_private, rx_work);
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struct usb_serial_port *port = priv->port;
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struct tty_struct *tty;
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unsigned char *data;
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int count;
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if (priv->rx_flags & THROTTLED) {
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if (priv->rx_flags & ACTUALLY_THROTTLED)
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schedule_work(&priv->rx_work);
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return;
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}
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/* By now I will flush data to the tty in packages of no more than
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* 64 bytes, to ensure I do not get throttled.
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* Ask USB mailing list for better aproach.
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*/
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tty = tty_port_tty_get(&port->port);
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if (!tty) {
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schedule_work(&priv->rx_work);
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dev_err(&port->dev, "%s - No tty available\n", __func__);
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return ;
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}
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count = min(64, serial_buf_data_avail(priv->rx_buf));
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if (count <= 0)
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goto out; /* We have finished sending everything. */
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tty_prepare_flip_string(tty, &data, count);
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if (!data) {
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dev_err(&port->dev, "%s- kzalloc(%d) failed.",
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__func__, count);
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goto out;
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}
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serial_buf_get(priv->rx_buf, data, count);
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tty_flip_buffer_push(tty);
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if (serial_buf_data_avail(priv->rx_buf))
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schedule_work(&priv->rx_work);
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out:
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tty_kref_put(tty);
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return;
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}
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/* End of private methods */
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static int aircable_probe(struct usb_serial *serial,
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const struct usb_device_id *id)
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{
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@ -330,247 +122,50 @@ static int aircable_probe(struct usb_serial *serial,
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return 0;
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}
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static int aircable_attach(struct usb_serial *serial)
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static int aircable_process_packet(struct tty_struct *tty,
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struct usb_serial_port *port, int has_headers,
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char *packet, int len)
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{
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struct usb_serial_port *port = serial->port[0];
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struct aircable_private *priv;
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priv = kzalloc(sizeof(struct aircable_private), GFP_KERNEL);
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if (!priv) {
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dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
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sizeof(struct aircable_private));
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return -ENOMEM;
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if (has_headers) {
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len -= HCI_HEADER_LENGTH;
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packet += HCI_HEADER_LENGTH;
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}
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if (len <= 0) {
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dbg("%s - malformed packet", __func__);
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return 0;
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}
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/* Allocation of Circular Buffers */
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priv->tx_buf = serial_buf_alloc();
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if (priv->tx_buf == NULL) {
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kfree(priv);
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return -ENOMEM;
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}
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tty_insert_flip_string(tty, packet, len);
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priv->rx_buf = serial_buf_alloc();
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if (priv->rx_buf == NULL) {
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kfree(priv->tx_buf);
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kfree(priv);
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return -ENOMEM;
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}
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priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
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priv->port = port;
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INIT_WORK(&priv->rx_work, aircable_read);
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usb_set_serial_port_data(serial->port[0], priv);
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return 0;
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return len;
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}
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static void aircable_release(struct usb_serial *serial)
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{
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struct usb_serial_port *port = serial->port[0];
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struct aircable_private *priv = usb_get_serial_port_data(port);
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dbg("%s", __func__);
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if (priv) {
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serial_buf_free(priv->tx_buf);
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serial_buf_free(priv->rx_buf);
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kfree(priv);
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}
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}
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static int aircable_write_room(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct aircable_private *priv = usb_get_serial_port_data(port);
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return serial_buf_data_avail(priv->tx_buf);
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}
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static int aircable_write(struct tty_struct *tty, struct usb_serial_port *port,
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const unsigned char *source, int count)
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{
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struct aircable_private *priv = usb_get_serial_port_data(port);
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int temp;
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dbg("%s - port %d, %d bytes", __func__, port->number, count);
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usb_serial_debug_data(debug, &port->dev, __func__, count, source);
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if (!count) {
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dbg("%s - write request of 0 bytes", __func__);
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return count;
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}
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temp = serial_buf_put(priv->tx_buf, source, count);
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aircable_send(port);
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if (count > AIRCABLE_BUF_SIZE)
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count = AIRCABLE_BUF_SIZE;
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return count;
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}
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static void aircable_write_bulk_callback(struct urb *urb)
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static void aircable_process_read_urb(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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int status = urb->status;
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int result;
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dbg("%s - urb status: %d", __func__ , status);
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/* This has been taken from cypress_m8.c cypress_write_int_callback */
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switch (status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__func__, status);
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port->write_urb_busy = 0;
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return;
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default:
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/* error in the urb, so we have to resubmit it */
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dbg("%s - Overflow in write", __func__);
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dbg("%s - nonzero write bulk status received: %d",
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__func__, status);
|
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port->write_urb->transfer_buffer_length = 1;
|
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port->write_urb->dev = port->serial->dev;
|
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result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
|
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if (result)
|
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dev_err(&urb->dev->dev,
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"%s - failed resubmitting write urb, error %d\n",
|
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__func__, result);
|
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else
|
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return;
|
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}
|
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|
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port->write_urb_busy = 0;
|
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|
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aircable_send(port);
|
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}
|
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|
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static void aircable_read_bulk_callback(struct urb *urb)
|
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{
|
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struct usb_serial_port *port = urb->context;
|
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struct aircable_private *priv = usb_get_serial_port_data(port);
|
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char *data = (char *)urb->transfer_buffer;
|
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struct tty_struct *tty;
|
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unsigned long no_packages, remaining, package_length, i;
|
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int result, shift = 0;
|
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unsigned char *temp;
|
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int status = urb->status;
|
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|
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dbg("%s - port %d", __func__, port->number);
|
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|
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if (status) {
|
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dbg("%s - urb status = %d", __func__, status);
|
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if (status == -EPROTO) {
|
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dbg("%s - caught -EPROTO, resubmitting the urb",
|
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__func__);
|
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usb_fill_bulk_urb(port->read_urb, port->serial->dev,
|
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usb_rcvbulkpipe(port->serial->dev,
|
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port->bulk_in_endpointAddress),
|
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port->read_urb->transfer_buffer,
|
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port->read_urb->transfer_buffer_length,
|
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aircable_read_bulk_callback, port);
|
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|
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result = usb_submit_urb(urb, GFP_ATOMIC);
|
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if (result)
|
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dev_err(&urb->dev->dev,
|
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"%s - failed resubmitting read urb, error %d\n",
|
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__func__, result);
|
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return;
|
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}
|
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dbg("%s - unable to handle the error, exiting.", __func__);
|
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return;
|
||||
}
|
||||
|
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usb_serial_debug_data(debug, &port->dev, __func__,
|
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urb->actual_length, urb->transfer_buffer);
|
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int has_headers;
|
||||
int count;
|
||||
int len;
|
||||
int i;
|
||||
|
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tty = tty_port_tty_get(&port->port);
|
||||
if (tty && urb->actual_length) {
|
||||
if (urb->actual_length <= 2) {
|
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/* This is an incomplete package */
|
||||
serial_buf_put(priv->rx_buf, urb->transfer_buffer,
|
||||
urb->actual_length);
|
||||
} else {
|
||||
temp = urb->transfer_buffer;
|
||||
if (temp[0] == RX_HEADER_0)
|
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shift = HCI_HEADER_LENGTH;
|
||||
if (!tty)
|
||||
return;
|
||||
|
||||
remaining = urb->actual_length;
|
||||
no_packages = urb->actual_length / (HCI_COMPLETE_FRAME);
|
||||
has_headers = (urb->actual_length > 2 && data[0] == RX_HEADER_0);
|
||||
|
||||
if (urb->actual_length % HCI_COMPLETE_FRAME != 0)
|
||||
no_packages++;
|
||||
|
||||
for (i = 0; i < no_packages; i++) {
|
||||
if (remaining > (HCI_COMPLETE_FRAME))
|
||||
package_length = HCI_COMPLETE_FRAME;
|
||||
else
|
||||
package_length = remaining;
|
||||
remaining -= package_length;
|
||||
|
||||
serial_buf_put(priv->rx_buf,
|
||||
urb->transfer_buffer + shift +
|
||||
(HCI_COMPLETE_FRAME) * (i),
|
||||
package_length - shift);
|
||||
}
|
||||
}
|
||||
aircable_read(&priv->rx_work);
|
||||
count = 0;
|
||||
for (i = 0; i < urb->actual_length; i += HCI_COMPLETE_FRAME) {
|
||||
len = min_t(int, urb->actual_length - i, HCI_COMPLETE_FRAME);
|
||||
count += aircable_process_packet(tty, port, has_headers,
|
||||
&data[i], len);
|
||||
}
|
||||
|
||||
if (count)
|
||||
tty_flip_buffer_push(tty);
|
||||
tty_kref_put(tty);
|
||||
|
||||
/* Schedule the next read */
|
||||
usb_fill_bulk_urb(port->read_urb, port->serial->dev,
|
||||
usb_rcvbulkpipe(port->serial->dev,
|
||||
port->bulk_in_endpointAddress),
|
||||
port->read_urb->transfer_buffer,
|
||||
port->read_urb->transfer_buffer_length,
|
||||
aircable_read_bulk_callback, port);
|
||||
|
||||
result = usb_submit_urb(urb, GFP_ATOMIC);
|
||||
if (result && result != -EPERM)
|
||||
dev_err(&urb->dev->dev,
|
||||
"%s - failed resubmitting read urb, error %d\n",
|
||||
__func__, result);
|
||||
}
|
||||
|
||||
/* Based on ftdi_sio.c throttle */
|
||||
static void aircable_throttle(struct tty_struct *tty)
|
||||
{
|
||||
struct usb_serial_port *port = tty->driver_data;
|
||||
struct aircable_private *priv = usb_get_serial_port_data(port);
|
||||
|
||||
dbg("%s - port %d", __func__, port->number);
|
||||
|
||||
spin_lock_irq(&priv->rx_lock);
|
||||
priv->rx_flags |= THROTTLED;
|
||||
spin_unlock_irq(&priv->rx_lock);
|
||||
}
|
||||
|
||||
/* Based on ftdi_sio.c unthrottle */
|
||||
static void aircable_unthrottle(struct tty_struct *tty)
|
||||
{
|
||||
struct usb_serial_port *port = tty->driver_data;
|
||||
struct aircable_private *priv = usb_get_serial_port_data(port);
|
||||
int actually_throttled;
|
||||
|
||||
dbg("%s - port %d", __func__, port->number);
|
||||
|
||||
spin_lock_irq(&priv->rx_lock);
|
||||
actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
|
||||
priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
|
||||
spin_unlock_irq(&priv->rx_lock);
|
||||
|
||||
if (actually_throttled)
|
||||
schedule_work(&priv->rx_work);
|
||||
}
|
||||
|
||||
static struct usb_driver aircable_driver = {
|
||||
|
|
@ -589,15 +184,14 @@ static struct usb_serial_driver aircable_device = {
|
|||
.usb_driver = &aircable_driver,
|
||||
.id_table = id_table,
|
||||
.num_ports = 1,
|
||||
.attach = aircable_attach,
|
||||
.bulk_out_size = HCI_COMPLETE_FRAME,
|
||||
/* Must modify prepare_write_buffer if multi_urb_write is changed. */
|
||||
.multi_urb_write = 0,
|
||||
.probe = aircable_probe,
|
||||
.release = aircable_release,
|
||||
.write = aircable_write,
|
||||
.write_room = aircable_write_room,
|
||||
.write_bulk_callback = aircable_write_bulk_callback,
|
||||
.read_bulk_callback = aircable_read_bulk_callback,
|
||||
.throttle = aircable_throttle,
|
||||
.unthrottle = aircable_unthrottle,
|
||||
.process_read_urb = aircable_process_read_urb,
|
||||
.prepare_write_buffer = aircable_prepare_write_buffer,
|
||||
.throttle = usb_serial_generic_throttle,
|
||||
.unthrottle = usb_serial_generic_unthrottle,
|
||||
};
|
||||
|
||||
static int __init aircable_init(void)
|
||||
|
|
|
|||
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Ссылка в новой задаче