// SPDX-License-Identifier: GPL-2.0 /* * AIRcable USB Bluetooth Dongle Driver. * * Copyright (C) 2010 Johan Hovold <[email protected]> * Copyright (C) 2006 Manuel Francisco Naranjo ([email protected]) * * 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 … #define AIRCABLE_USB_PID … /* Protocol Stuff */ #define HCI_HEADER_LENGTH … #define TX_HEADER_0 … #define TX_HEADER_1 … #define RX_HEADER_0 … #define RX_HEADER_1 … #define HCI_COMPLETE_FRAME … /* rx_flags */ #define THROTTLED … #define ACTUALLY_THROTTLED … #define DRIVER_AUTHOR … #define DRIVER_DESC … /* ID table that will be registered with USB core */ static const struct usb_device_id id_table[] = …; MODULE_DEVICE_TABLE(usb, id_table); static int aircable_prepare_write_buffer(struct usb_serial_port *port, void *dest, size_t size) { … } static int aircable_calc_num_ports(struct usb_serial *serial, struct usb_serial_endpoints *epds) { … } static int aircable_process_packet(struct usb_serial_port *port, int has_headers, char *packet, int len) { … } static void aircable_process_read_urb(struct urb *urb) { … } static struct usb_serial_driver aircable_device = …; static struct usb_serial_driver * const serial_drivers[] = …; module_usb_serial_driver(…); MODULE_AUTHOR(…); MODULE_DESCRIPTION(…); MODULE_LICENSE(…) …;
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