1 /* 2 * Navman Serial USB driver 3 * 4 * Copyright (C) 2006 Greg Kroah-Hartman <gregkh@suse.de> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * version 2 as published by the Free Software Foundation. 9 * 10 * TODO: 11 * Add termios method that uses copy_hw but also kills all echo 12 * flags as the navman is rx only so cannot echo. 13 */ 14 15 #include <linux/gfp.h> 16 #include <linux/kernel.h> 17 #include <linux/init.h> 18 #include <linux/tty.h> 19 #include <linux/tty_flip.h> 20 #include <linux/module.h> 21 #include <linux/usb.h> 22 #include <linux/usb/serial.h> 23 24 static const struct usb_device_id id_table[] = { 25 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ 26 { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */ 27 { }, 28 }; 29 MODULE_DEVICE_TABLE(usb, id_table); 30 31 static void navman_read_int_callback(struct urb *urb) 32 { 33 struct usb_serial_port *port = urb->context; 34 unsigned char *data = urb->transfer_buffer; 35 int status = urb->status; 36 int result; 37 38 switch (status) { 39 case 0: 40 /* success */ 41 break; 42 case -ECONNRESET: 43 case -ENOENT: 44 case -ESHUTDOWN: 45 /* this urb is terminated, clean up */ 46 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 47 __func__, status); 48 return; 49 default: 50 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 51 __func__, status); 52 goto exit; 53 } 54 55 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 56 57 if (urb->actual_length) { 58 tty_insert_flip_string(&port->port, data, urb->actual_length); 59 tty_flip_buffer_push(&port->port); 60 } 61 62 exit: 63 result = usb_submit_urb(urb, GFP_ATOMIC); 64 if (result) 65 dev_err(&urb->dev->dev, 66 "%s - Error %d submitting interrupt urb\n", 67 __func__, result); 68 } 69 70 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port) 71 { 72 int result = 0; 73 74 if (port->interrupt_in_urb) { 75 dev_dbg(&port->dev, "%s - adding interrupt input for treo\n", 76 __func__); 77 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 78 if (result) 79 dev_err(&port->dev, 80 "%s - failed submitting interrupt urb, error %d\n", 81 __func__, result); 82 } 83 return result; 84 } 85 86 static void navman_close(struct usb_serial_port *port) 87 { 88 usb_kill_urb(port->interrupt_in_urb); 89 } 90 91 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, 92 const unsigned char *buf, int count) 93 { 94 /* 95 * This device can't write any data, only read from the device 96 */ 97 return -EOPNOTSUPP; 98 } 99 100 static struct usb_serial_driver navman_device = { 101 .driver = { 102 .owner = THIS_MODULE, 103 .name = "navman", 104 }, 105 .id_table = id_table, 106 .num_ports = 1, 107 .open = navman_open, 108 .close = navman_close, 109 .write = navman_write, 110 .read_int_callback = navman_read_int_callback, 111 }; 112 113 static struct usb_serial_driver * const serial_drivers[] = { 114 &navman_device, NULL 115 }; 116 117 module_usb_serial_driver(serial_drivers, id_table); 118 119 MODULE_LICENSE("GPL"); 120