projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 958e8741 GKH |
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/kernel.h> | |
| 12 | #include <linux/init.h> | |
| 13 | #include <linux/tty.h> | |
| 14 | #include <linux/module.h> | |
| 15 | #include <linux/usb.h> | |
| 16 | #include <linux/usb/serial.h> | |
| 17 | ||
| 715b1dc0 | 18 | #define URB_DEBUG_MAX_IN_FLIGHT_URBS 4000 |
| 71be4f81 | 19 | #define USB_DEBUG_MAX_PACKET_SIZE 8 |
| 98fcb5f7 JW |
20 | #define USB_DEBUG_BRK_SIZE 8 |
| 21 | static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = { | |
| 22 | 0x00, | |
| 23 | 0xff, | |
| 24 | 0x01, | |
| 25 | 0xfe, | |
| 26 | 0x00, | |
| 27 | 0xfe, | |
| 28 | 0x01, | |
| 29 | 0xff, | |
| 30 | }; | |
| 71be4f81 | 31 | |
| 958e8741 GKH |
32 | static struct usb_device_id id_table [] = { |
| 33 | { USB_DEVICE(0x0525, 0x127a) }, | |
| 34 | { }, | |
| 35 | }; | |
| 36 | MODULE_DEVICE_TABLE(usb, id_table); | |
| 37 | ||
| 38 | static struct usb_driver debug_driver = { | |
| 39 | .name = "debug", | |
| 40 | .probe = usb_serial_probe, | |
| 41 | .disconnect = usb_serial_disconnect, | |
| 42 | .id_table = id_table, | |
| 43 | .no_dynamic_id = 1, | |
| 44 | }; | |
| 45 | ||
| a509a7e4 | 46 | static int usb_debug_open(struct tty_struct *tty, struct usb_serial_port *port) |
| 71be4f81 AG |
47 | { |
| 48 | port->bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE; | |
| a509a7e4 | 49 | return usb_serial_generic_open(tty, port); |
| 71be4f81 AG |
50 | } |
| 51 | ||
| 98fcb5f7 JW |
52 | /* This HW really does not support a serial break, so one will be |
| 53 | * emulated when ever the break state is set to true. | |
| 54 | */ | |
| 55 | static void usb_debug_break_ctl(struct tty_struct *tty, int break_state) | |
| 56 | { | |
| 57 | struct usb_serial_port *port = tty->driver_data; | |
| 58 | if (!break_state) | |
| 59 | return; | |
| 60 | usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE); | |
| 61 | } | |
| 62 | ||
| 63 | static void usb_debug_read_bulk_callback(struct urb *urb) | |
| 64 | { | |
| 65 | struct usb_serial_port *port = urb->context; | |
| 66 | ||
| 67 | if (urb->actual_length == USB_DEBUG_BRK_SIZE && | |
| 68 | memcmp(urb->transfer_buffer, USB_DEBUG_BRK, | |
| 69 | USB_DEBUG_BRK_SIZE) == 0) { | |
| 70 | usb_serial_handle_break(port); | |
| 71 | usb_serial_generic_resubmit_read_urb(port, GFP_ATOMIC); | |
| 72 | return; | |
| 73 | } | |
| 74 | ||
| 75 | usb_serial_generic_read_bulk_callback(urb); | |
| 76 | } | |
| 77 | ||
| 958e8741 GKH |
78 | static struct usb_serial_driver debug_device = { |
| 79 | .driver = { | |
| 80 | .owner = THIS_MODULE, | |
| 81 | .name = "debug", | |
| 82 | }, | |
| 83 | .id_table = id_table, | |
| 958e8741 | 84 | .num_ports = 1, |
| 71be4f81 | 85 | .open = usb_debug_open, |
| 715b1dc0 | 86 | .max_in_flight_urbs = URB_DEBUG_MAX_IN_FLIGHT_URBS, |
| 98fcb5f7 JW |
87 | .break_ctl = usb_debug_break_ctl, |
| 88 | .read_bulk_callback = usb_debug_read_bulk_callback, | |
| 958e8741 GKH |
89 | }; |
| 90 | ||
| 91 | static int __init debug_init(void) | |
| 92 | { | |
| 93 | int retval; | |
| 94 | ||
| 95 | retval = usb_serial_register(&debug_device); | |
| 96 | if (retval) | |
| 97 | return retval; | |
| 98 | retval = usb_register(&debug_driver); | |
| 99 | if (retval) | |
| 100 | usb_serial_deregister(&debug_device); | |
| 101 | return retval; | |
| 102 | } | |
| 103 | ||
| 104 | static void __exit debug_exit(void) | |
| 105 | { | |
| 106 | usb_deregister(&debug_driver); | |
| 107 | usb_serial_deregister(&debug_device); | |
| 108 | } | |
| 109 | ||
| 110 | module_init(debug_init); | |
| 111 | module_exit(debug_exit); | |
| 112 | MODULE_LICENSE("GPL"); |