| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * USB Debug cable driver |
| 4 | * |
| 5 | * Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com> |
| 6 | */ |
| 7 | |
| 8 | #include <linux/gfp.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/tty.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/usb.h> |
| 13 | #include <linux/usb/serial.h> |
| 14 | |
| 15 | #define USB_DEBUG_MAX_PACKET_SIZE 8 |
| 16 | #define USB_DEBUG_BRK_SIZE 8 |
| 17 | static const char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = { |
| 18 | 0x00, |
| 19 | 0xff, |
| 20 | 0x01, |
| 21 | 0xfe, |
| 22 | 0x00, |
| 23 | 0xfe, |
| 24 | 0x01, |
| 25 | 0xff, |
| 26 | }; |
| 27 | |
| 28 | static const struct usb_device_id id_table[] = { |
| 29 | { USB_DEVICE(0x0525, 0x127a) }, |
| 30 | { }, |
| 31 | }; |
| 32 | |
| 33 | static const struct usb_device_id dbc_id_table[] = { |
| 34 | { USB_DEVICE(0x1d6b, 0x0010) }, |
| 35 | { USB_DEVICE(0x1d6b, 0x0011) }, |
| 36 | { }, |
| 37 | }; |
| 38 | |
| 39 | static const struct usb_device_id id_table_combined[] = { |
| 40 | { USB_DEVICE(0x0525, 0x127a) }, |
| 41 | { USB_DEVICE(0x1d6b, 0x0010) }, |
| 42 | { USB_DEVICE(0x1d6b, 0x0011) }, |
| 43 | { }, |
| 44 | }; |
| 45 | MODULE_DEVICE_TABLE(usb, id_table_combined); |
| 46 | |
| 47 | /* This HW really does not support a serial break, so one will be |
| 48 | * emulated when ever the break state is set to true. |
| 49 | */ |
| 50 | static void usb_debug_break_ctl(struct tty_struct *tty, int break_state) |
| 51 | { |
| 52 | struct usb_serial_port *port = tty->driver_data; |
| 53 | if (!break_state) |
| 54 | return; |
| 55 | usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE); |
| 56 | } |
| 57 | |
| 58 | static void usb_debug_process_read_urb(struct urb *urb) |
| 59 | { |
| 60 | struct usb_serial_port *port = urb->context; |
| 61 | |
| 62 | if (urb->actual_length == USB_DEBUG_BRK_SIZE && |
| 63 | memcmp(urb->transfer_buffer, USB_DEBUG_BRK, |
| 64 | USB_DEBUG_BRK_SIZE) == 0) { |
| 65 | usb_serial_handle_break(port); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | usb_serial_generic_process_read_urb(urb); |
| 70 | } |
| 71 | |
| 72 | static void usb_debug_init_termios(struct tty_struct *tty) |
| 73 | { |
| 74 | tty->termios.c_lflag &= ~(ECHO | ECHONL); |
| 75 | } |
| 76 | |
| 77 | static struct usb_serial_driver debug_device = { |
| 78 | .driver = { |
| 79 | .owner = THIS_MODULE, |
| 80 | .name = "debug", |
| 81 | }, |
| 82 | .id_table = id_table, |
| 83 | .num_ports = 1, |
| 84 | .bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE, |
| 85 | .break_ctl = usb_debug_break_ctl, |
| 86 | .init_termios = usb_debug_init_termios, |
| 87 | .process_read_urb = usb_debug_process_read_urb, |
| 88 | }; |
| 89 | |
| 90 | static struct usb_serial_driver dbc_device = { |
| 91 | .driver = { |
| 92 | .owner = THIS_MODULE, |
| 93 | .name = "xhci_dbc", |
| 94 | }, |
| 95 | .id_table = dbc_id_table, |
| 96 | .num_ports = 1, |
| 97 | .break_ctl = usb_debug_break_ctl, |
| 98 | .init_termios = usb_debug_init_termios, |
| 99 | .process_read_urb = usb_debug_process_read_urb, |
| 100 | }; |
| 101 | |
| 102 | static struct usb_serial_driver * const serial_drivers[] = { |
| 103 | &debug_device, &dbc_device, NULL |
| 104 | }; |
| 105 | |
| 106 | module_usb_serial_driver(serial_drivers, id_table_combined); |
| 107 | MODULE_LICENSE("GPL v2"); |