mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 08:28:13 +00:00
eb0c68ea42
Drop redundant URB transfer-buffer casts. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Johan Hovold <johan@kernel.org>
161 lines
4.9 KiB
C
161 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* AIRcable USB Bluetooth Dongle Driver.
|
|
*
|
|
* Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
|
|
* Copyright (C) 2006 Manuel Francisco Naranjo (naranjo.manuel@gmail.com)
|
|
*
|
|
* The device works as an standard CDC device, it has 2 interfaces, the first
|
|
* one is for firmware access and the second is the serial one.
|
|
* The protocol is very simply, there are two possibilities reading or writing.
|
|
* When writing the first urb must have a Header that starts with 0x20 0x29 the
|
|
* next two bytes must say how much data will be sent.
|
|
* When reading the process is almost equal except that the header starts with
|
|
* 0x00 0x20.
|
|
*
|
|
* The device simply need some stuff to understand data coming from the usb
|
|
* buffer: The First and Second byte is used for a Header, the Third and Fourth
|
|
* tells the device the amount of information the package holds.
|
|
* Packages are 60 bytes long Header Stuff.
|
|
* When writing to the device the first two bytes of the header are 0x20 0x29
|
|
* When reading the bytes are 0x00 0x20, or 0x00 0x10, there is an strange
|
|
* situation, when too much data arrives to the device because it sends the data
|
|
* but with out the header. I will use a simply hack to override this situation,
|
|
* if there is data coming that does not contain any header, then that is data
|
|
* that must go directly to the tty, as there is no documentation about if there
|
|
* is any other control code, I will simply check for the first
|
|
* one.
|
|
*
|
|
* I have taken some info from a Greg Kroah-Hartman article:
|
|
* http://www.linuxjournal.com/article/6573
|
|
* And from Linux Device Driver Kit CD, which is a great work, the authors taken
|
|
* the work to recompile lots of information an knowledge in drivers development
|
|
* and made it all available inside a cd.
|
|
* URL: http://kernel.org/pub/linux/kernel/people/gregkh/ddk/
|
|
*
|
|
*/
|
|
|
|
#include <asm/unaligned.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
|
|
/* Vendor and Product ID */
|
|
#define AIRCABLE_VID 0x16CA
|
|
#define AIRCABLE_USB_PID 0x1502
|
|
|
|
/* Protocol Stuff */
|
|
#define HCI_HEADER_LENGTH 0x4
|
|
#define TX_HEADER_0 0x20
|
|
#define TX_HEADER_1 0x29
|
|
#define RX_HEADER_0 0x00
|
|
#define RX_HEADER_1 0x20
|
|
#define HCI_COMPLETE_FRAME 64
|
|
|
|
/* rx_flags */
|
|
#define THROTTLED 0x01
|
|
#define ACTUALLY_THROTTLED 0x02
|
|
|
|
#define DRIVER_AUTHOR "Naranjo, Manuel Francisco <naranjo.manuel@gmail.com>, Johan Hovold <jhovold@gmail.com>"
|
|
#define DRIVER_DESC "AIRcable USB Driver"
|
|
|
|
/* ID table that will be registered with USB core */
|
|
static const struct usb_device_id id_table[] = {
|
|
{ USB_DEVICE(AIRCABLE_VID, AIRCABLE_USB_PID) },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, id_table);
|
|
|
|
static int aircable_prepare_write_buffer(struct usb_serial_port *port,
|
|
void *dest, size_t size)
|
|
{
|
|
int count;
|
|
unsigned char *buf = dest;
|
|
|
|
count = kfifo_out_locked(&port->write_fifo, buf + HCI_HEADER_LENGTH,
|
|
size - HCI_HEADER_LENGTH, &port->lock);
|
|
buf[0] = TX_HEADER_0;
|
|
buf[1] = TX_HEADER_1;
|
|
put_unaligned_le16(count, &buf[2]);
|
|
|
|
return count + HCI_HEADER_LENGTH;
|
|
}
|
|
|
|
static int aircable_calc_num_ports(struct usb_serial *serial,
|
|
struct usb_serial_endpoints *epds)
|
|
{
|
|
/* Ignore the first interface, which has no bulk endpoints. */
|
|
if (epds->num_bulk_out == 0) {
|
|
dev_dbg(&serial->interface->dev,
|
|
"ignoring interface with no bulk-out endpoints\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int aircable_process_packet(struct usb_serial_port *port,
|
|
int has_headers, char *packet, int len)
|
|
{
|
|
if (has_headers) {
|
|
len -= HCI_HEADER_LENGTH;
|
|
packet += HCI_HEADER_LENGTH;
|
|
}
|
|
if (len <= 0) {
|
|
dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
tty_insert_flip_string(&port->port, packet, len);
|
|
|
|
return len;
|
|
}
|
|
|
|
static void aircable_process_read_urb(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
char *data = urb->transfer_buffer;
|
|
int has_headers;
|
|
int count;
|
|
int len;
|
|
int i;
|
|
|
|
has_headers = (urb->actual_length > 2 && data[0] == RX_HEADER_0);
|
|
|
|
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(port, has_headers,
|
|
&data[i], len);
|
|
}
|
|
|
|
if (count)
|
|
tty_flip_buffer_push(&port->port);
|
|
}
|
|
|
|
static struct usb_serial_driver aircable_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "aircable",
|
|
},
|
|
.id_table = id_table,
|
|
.bulk_out_size = HCI_COMPLETE_FRAME,
|
|
.calc_num_ports = aircable_calc_num_ports,
|
|
.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 struct usb_serial_driver * const serial_drivers[] = {
|
|
&aircable_device, NULL
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL v2");
|