Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/usb/serial/usb_debug.c

  1 /*
  2  * USB Debug cable driver
  3  *
  4  * Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com>
  5  *
  6  *      This program is free software; you can redistribute it and/or
  7  *      modify it under the terms of the GNU General Public License version
  8  *      2 as published by the Free Software Foundation.
  9  */
 10 
 11 #include <linux/gfp.h>
 12 #include <linux/kernel.h>
 13 #include <linux/tty.h>
 14 #include <linux/module.h>
 15 #include <linux/usb.h>
 16 #include <linux/usb/serial.h>
 17 
 18 #define USB_DEBUG_MAX_PACKET_SIZE       8
 19 #define USB_DEBUG_BRK_SIZE              8
 20 static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
 21         0x00,
 22         0xff,
 23         0x01,
 24         0xfe,
 25         0x00,
 26         0xfe,
 27         0x01,
 28         0xff,
 29 };
 30 
 31 static const struct usb_device_id id_table[] = {
 32         { USB_DEVICE(0x0525, 0x127a) },
 33         { },
 34 };
 35 MODULE_DEVICE_TABLE(usb, id_table);
 36 
 37 /* This HW really does not support a serial break, so one will be
 38  * emulated when ever the break state is set to true.
 39  */
 40 static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
 41 {
 42         struct usb_serial_port *port = tty->driver_data;
 43         if (!break_state)
 44                 return;
 45         usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
 46 }
 47 
 48 static void usb_debug_process_read_urb(struct urb *urb)
 49 {
 50         struct usb_serial_port *port = urb->context;
 51 
 52         if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
 53                 memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
 54                                                 USB_DEBUG_BRK_SIZE) == 0) {
 55                 usb_serial_handle_break(port);
 56                 return;
 57         }
 58 
 59         usb_serial_generic_process_read_urb(urb);
 60 }
 61 
 62 static struct usb_serial_driver debug_device = {
 63         .driver = {
 64                 .owner =        THIS_MODULE,
 65                 .name =         "debug",
 66         },
 67         .id_table =             id_table,
 68         .num_ports =            1,
 69         .bulk_out_size =        USB_DEBUG_MAX_PACKET_SIZE,
 70         .break_ctl =            usb_debug_break_ctl,
 71         .process_read_urb =     usb_debug_process_read_urb,
 72 };
 73 
 74 static struct usb_serial_driver * const serial_drivers[] = {
 75         &debug_device, NULL
 76 };
 77 
 78 module_usb_serial_driver(serial_drivers, id_table);
 79 MODULE_LICENSE("GPL");
 80 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us