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 .name = "empeg", 47 }, 48 .id_table = id_table, 49 .num_ports = 1, 50 .bulk_out_size = 256, 51 .throttle = usb_serial_generic_throttle, 52 .unthrottle = usb_serial_generic_unthrottle, 53 .attach = empeg_startup, 54 .init_termios = empeg_init_termios, 55 }; 56 57 static struct usb_serial_driver * const serial_drivers[] = { 58 &empeg_device, NULL 59 }; 60 61 static int empeg_startup(struct usb_serial *serial) 62 { 63 int r; 64 65 if (serial->dev->actconfig->desc.bConfigurationValue != 1) { 66 dev_err(&serial->dev->dev, "active config #%d != 1 ??\n", 67 serial->dev->actconfig->desc.bConfigurationValue); 68 return -ENODEV; 69 } 70 71 r = usb_reset_configuration(serial->dev); 72 73 /* continue on with initialization */ 74 return r; 75 } 76 77 static void empeg_init_termios(struct tty_struct *tty) 78 { 79 struct ktermios *termios = &tty->termios; 80 81 /* 82 * The empeg-car player wants these particular tty settings. 83 * You could, for example, change the baud rate, however the 84 * player only supports 115200 (currently), so there is really 85 * no point in support for changes to the tty settings. 86 * (at least for now) 87 * 88 * The default requirements for this device are: 89 */ 90 termios->c_iflag 91 &= ~(IGNBRK /* disable ignore break */ 92 | BRKINT /* disable break causes interrupt */ 93 | PARMRK /* disable mark parity errors */ 94 | ISTRIP /* disable clear high bit of input characters */ 95 | INLCR /* disable translate NL to CR */ 96 | IGNCR /* disable ignore CR */ 97 | ICRNL /* disable translate CR to NL */ 98 | IXON); /* disable enable XON/XOFF flow control */ 99 100 termios->c_oflag 101 &= ~OPOST; /* disable postprocess output characters */ 102 103 termios->c_lflag 104 &= ~(ECHO /* disable echo input characters */ 105 | ECHONL /* disable echo new line */ 106 | ICANON /* disable erase, kill, werase, and rprnt special characters */ 107 | ISIG /* disable interrupt, quit, and suspend special characters */ 108 | IEXTEN); /* disable non-POSIX special characters */ 109 110 termios->c_cflag 111 &= ~(CSIZE /* no size */ 112 | PARENB /* disable parity bit */ 113 | CBAUD); /* clear current baud rate */ 114 115 termios->c_cflag 116 |= CS8; /* character size 8 bits */ 117 118 tty_encode_baud_rate(tty, 115200, 115200); 119 } 120 121 module_usb_serial_driver(serial_drivers, id_table); 122 123 MODULE_AUTHOR(DRIVER_AUTHOR); 124 MODULE_DESCRIPTION(DRIVER_DESC); 125 MODULE_LICENSE("GPL v2"); 126