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