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/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); 126 MODULE_LICENSE("GPL v2"); 127