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![Johan Hovold](/assets/img/avatar_default.png)
Returned length should include header length. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
228 lines
6.5 KiB
C
228 lines
6.5 KiB
C
/*
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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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*
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* The device works as an standard CDC device, it has 2 interfaces, the first
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* one is for firmware access and the second is the serial one.
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* The protocol is very simply, there are two posibilities reading or writing.
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* When writing the first urb must have a Header that starts with 0x20 0x29 the
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* next two bytes must say how much data will be sended.
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* When reading the process is almost equal except that the header starts with
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* 0x00 0x20.
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*
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* The device simply need some stuff to understand data comming from the usb
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* buffer: The First and Second byte is used for a Header, the Third and Fourth
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* tells the device the amount of information the package holds.
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* Packages are 60 bytes long Header Stuff.
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* When writing to the device the first two bytes of the header are 0x20 0x29
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* When reading the bytes are 0x00 0x20, or 0x00 0x10, there is an strange
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* situation, when too much data arrives to the device because it sends the data
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* but with out the header. I will use a simply hack to override this situation,
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* if there is data coming that does not contain any header, then that is data
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* that must go directly to the tty, as there is no documentation about if there
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* is any other control code, I will simply check for the first
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* one.
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*
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* The driver registers himself with the USB-serial core and the USB Core. I had
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* to implement a probe function agains USB-serial, because other way, the
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* driver was attaching himself to both interfaces. I have tryed with different
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* configurations of usb_serial_driver with out exit, only the probe function
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* could handle this correctly.
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*
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* I have taken some info from a Greg Kroah-Hartman article:
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* http://www.linuxjournal.com/article/6573
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* And from Linux Device Driver Kit CD, which is a great work, the authors taken
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* the work to recompile lots of information an knowladge in drivers development
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* and made it all avaible inside a cd.
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* URL: http://kernel.org/pub/linux/kernel/people/gregkh/ddk/
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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/usb.h>
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#include <linux/usb/serial.h>
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static int debug;
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/* Vendor and Product ID */
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#define AIRCABLE_VID 0x16CA
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#define AIRCABLE_USB_PID 0x1502
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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 HCI_COMPLETE_FRAME 64
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/* rx_flags */
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#define THROTTLED 0x01
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#define ACTUALLY_THROTTLED 0x02
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/*
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* Version Information
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*/
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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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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(AIRCABLE_VID, AIRCABLE_USB_PID) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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static int aircable_prepare_write_buffer(struct usb_serial_port *port,
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void *dest, size_t size)
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{
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int count;
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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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put_unaligned_le16(count, &buf[2]);
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return count + HCI_HEADER_LENGTH;
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}
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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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struct usb_host_interface *iface_desc = serial->interface->
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cur_altsetting;
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struct usb_endpoint_descriptor *endpoint;
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int num_bulk_out = 0;
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int i;
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for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
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endpoint = &iface_desc->endpoint[i].desc;
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if (usb_endpoint_is_bulk_out(endpoint)) {
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dbg("found bulk out on endpoint %d", i);
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++num_bulk_out;
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}
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}
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if (num_bulk_out == 0) {
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dbg("Invalid interface, discarding");
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return -ENODEV;
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}
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return 0;
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}
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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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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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tty_insert_flip_string(tty, packet, len);
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return len;
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}
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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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char *data = (char *)urb->transfer_buffer;
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struct tty_struct *tty;
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int has_headers;
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int count;
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int len;
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int i;
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tty = tty_port_tty_get(&port->port);
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if (!tty)
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return;
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has_headers = (urb->actual_length > 2 && data[0] == RX_HEADER_0);
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count = 0;
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for (i = 0; i < urb->actual_length; i += HCI_COMPLETE_FRAME) {
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len = min_t(int, urb->actual_length - i, HCI_COMPLETE_FRAME);
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count += aircable_process_packet(tty, port, has_headers,
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&data[i], len);
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}
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if (count)
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tty_flip_buffer_push(tty);
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tty_kref_put(tty);
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}
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static struct usb_driver aircable_driver = {
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.name = "aircable",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table,
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.no_dynamic_id = 1,
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};
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static struct usb_serial_driver aircable_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "aircable",
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},
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.usb_driver = &aircable_driver,
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.id_table = id_table,
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.num_ports = 1,
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.bulk_out_size = HCI_COMPLETE_FRAME,
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.probe = aircable_probe,
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.process_read_urb = aircable_process_read_urb,
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.prepare_write_buffer = aircable_prepare_write_buffer,
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.throttle = usb_serial_generic_throttle,
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.unthrottle = usb_serial_generic_unthrottle,
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};
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static int __init aircable_init(void)
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{
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int retval;
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retval = usb_serial_register(&aircable_device);
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if (retval)
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goto failed_serial_register;
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retval = usb_register(&aircable_driver);
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if (retval)
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goto failed_usb_register;
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return 0;
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failed_usb_register:
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usb_serial_deregister(&aircable_device);
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failed_serial_register:
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return retval;
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}
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static void __exit aircable_exit(void)
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{
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usb_deregister(&aircable_driver);
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usb_serial_deregister(&aircable_device);
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}
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_VERSION(DRIVER_VERSION);
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MODULE_LICENSE("GPL");
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module_init(aircable_init);
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module_exit(aircable_exit);
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Debug enabled or not");
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