Googler | 9398cc3 | 2022-12-02 17:21:52 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Googler | af606d2 | 2022-10-26 21:40:12 -0700 | [diff] [blame] | 2 | /* |
| 3 | * USB Empeg empeg-car player driver |
| 4 | * |
| 5 | * Copyright (C) 2000, 2001 |
| 6 | * Gary Brubaker (xavyer@ix.netcom.com) |
| 7 | * |
| 8 | * Copyright (C) 1999 - 2001 |
| 9 | * Greg Kroah-Hartman (greg@kroah.com) |
| 10 | * |
Googler | 9398cc3 | 2022-12-02 17:21:52 +0800 | [diff] [blame^] | 11 | * See Documentation/usb/usb-serial.rst for more information on using this |
Googler | af606d2 | 2022-10-26 21:40:12 -0700 | [diff] [blame] | 12 | * driver |
| 13 | */ |
| 14 | |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/tty.h> |
| 19 | #include <linux/tty_driver.h> |
| 20 | #include <linux/tty_flip.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/uaccess.h> |
| 24 | #include <linux/usb.h> |
| 25 | #include <linux/usb/serial.h> |
| 26 | |
| 27 | #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Gary Brubaker <xavyer@ix.netcom.com>" |
| 28 | #define DRIVER_DESC "USB Empeg Mark I/II Driver" |
| 29 | |
| 30 | #define EMPEG_VENDOR_ID 0x084f |
| 31 | #define EMPEG_PRODUCT_ID 0x0001 |
| 32 | |
| 33 | /* function prototypes for an empeg-car player */ |
| 34 | static int empeg_startup(struct usb_serial *serial); |
| 35 | static void empeg_init_termios(struct tty_struct *tty); |
| 36 | |
| 37 | static const struct usb_device_id id_table[] = { |
| 38 | { USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) }, |
| 39 | { } /* Terminating entry */ |
| 40 | }; |
| 41 | |
| 42 | MODULE_DEVICE_TABLE(usb, id_table); |
| 43 | |
| 44 | static struct usb_serial_driver empeg_device = { |
| 45 | .driver = { |
| 46 | .owner = THIS_MODULE, |
| 47 | .name = "empeg", |
| 48 | }, |
| 49 | .id_table = id_table, |
| 50 | .num_ports = 1, |
| 51 | .bulk_out_size = 256, |
| 52 | .throttle = usb_serial_generic_throttle, |
| 53 | .unthrottle = usb_serial_generic_unthrottle, |
| 54 | .attach = empeg_startup, |
| 55 | .init_termios = empeg_init_termios, |
| 56 | }; |
| 57 | |
| 58 | static struct usb_serial_driver * const serial_drivers[] = { |
| 59 | &empeg_device, NULL |
| 60 | }; |
| 61 | |
| 62 | static int empeg_startup(struct usb_serial *serial) |
| 63 | { |
| 64 | int r; |
| 65 | |
| 66 | if (serial->dev->actconfig->desc.bConfigurationValue != 1) { |
| 67 | dev_err(&serial->dev->dev, "active config #%d != 1 ??\n", |
| 68 | serial->dev->actconfig->desc.bConfigurationValue); |
| 69 | return -ENODEV; |
| 70 | } |
| 71 | |
| 72 | r = usb_reset_configuration(serial->dev); |
| 73 | |
| 74 | /* continue on with initialization */ |
| 75 | return r; |
| 76 | } |
| 77 | |
| 78 | static void empeg_init_termios(struct tty_struct *tty) |
| 79 | { |
| 80 | struct ktermios *termios = &tty->termios; |
| 81 | |
| 82 | /* |
| 83 | * The empeg-car player wants these particular tty settings. |
| 84 | * You could, for example, change the baud rate, however the |
| 85 | * player only supports 115200 (currently), so there is really |
| 86 | * no point in support for changes to the tty settings. |
| 87 | * (at least for now) |
| 88 | * |
| 89 | * The default requirements for this device are: |
| 90 | */ |
| 91 | termios->c_iflag |
| 92 | &= ~(IGNBRK /* disable ignore break */ |
| 93 | | BRKINT /* disable break causes interrupt */ |
| 94 | | PARMRK /* disable mark parity errors */ |
| 95 | | ISTRIP /* disable clear high bit of input characters */ |
| 96 | | INLCR /* disable translate NL to CR */ |
| 97 | | IGNCR /* disable ignore CR */ |
| 98 | | ICRNL /* disable translate CR to NL */ |
| 99 | | IXON); /* disable enable XON/XOFF flow control */ |
| 100 | |
| 101 | termios->c_oflag |
| 102 | &= ~OPOST; /* disable postprocess output characters */ |
| 103 | |
| 104 | termios->c_lflag |
| 105 | &= ~(ECHO /* disable echo input characters */ |
| 106 | | ECHONL /* disable echo new line */ |
| 107 | | ICANON /* disable erase, kill, werase, and rprnt special characters */ |
| 108 | | ISIG /* disable interrupt, quit, and suspend special characters */ |
| 109 | | IEXTEN); /* disable non-POSIX special characters */ |
| 110 | |
| 111 | termios->c_cflag |
| 112 | &= ~(CSIZE /* no size */ |
| 113 | | PARENB /* disable parity bit */ |
| 114 | | CBAUD); /* clear current baud rate */ |
| 115 | |
| 116 | termios->c_cflag |
| 117 | |= CS8; /* character size 8 bits */ |
| 118 | |
| 119 | tty_encode_baud_rate(tty, 115200, 115200); |
| 120 | } |
| 121 | |
| 122 | module_usb_serial_driver(serial_drivers, id_table); |
| 123 | |
| 124 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 125 | MODULE_DESCRIPTION(DRIVER_DESC); |
Googler | 9398cc3 | 2022-12-02 17:21:52 +0800 | [diff] [blame^] | 126 | MODULE_LICENSE("GPL v2"); |