106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/*
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* USB Debug cable driver
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*
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* Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*/
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#define USB_DEBUG_MAX_PACKET_SIZE 8
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#define USB_DEBUG_BRK_SIZE 8
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static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
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0x00,
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0xff,
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0x01,
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0xfe,
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0x00,
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0xfe,
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0x01,
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0xff,
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};
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(0x0525, 0x127a) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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static struct usb_driver debug_driver = {
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.name = "debug",
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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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/* This HW really does not support a serial break, so one will be
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* emulated when ever the break state is set to true.
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*/
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static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
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{
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struct usb_serial_port *port = tty->driver_data;
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if (!break_state)
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return;
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usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
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}
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static void usb_debug_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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if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
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memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
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USB_DEBUG_BRK_SIZE) == 0) {
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usb_serial_handle_break(port);
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usb_serial_generic_submit_read_urb(port, GFP_ATOMIC);
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return;
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}
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usb_serial_generic_read_bulk_callback(urb);
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}
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static struct usb_serial_driver debug_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "debug",
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},
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.id_table = id_table,
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.num_ports = 1,
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.bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE,
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.break_ctl = usb_debug_break_ctl,
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.read_bulk_callback = usb_debug_read_bulk_callback,
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};
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static int __init debug_init(void)
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{
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int retval;
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retval = usb_serial_register(&debug_device);
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if (retval)
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return retval;
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retval = usb_register(&debug_driver);
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if (retval)
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usb_serial_deregister(&debug_device);
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return retval;
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}
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static void __exit debug_exit(void)
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{
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usb_deregister(&debug_driver);
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usb_serial_deregister(&debug_device);
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}
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module_init(debug_init);
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module_exit(debug_exit);
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MODULE_LICENSE("GPL");
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