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 24static int debug; 25 26static const struct usb_device_id id_table[] = { 27 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ 28 { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */ 29 { }, 30}; 31MODULE_DEVICE_TABLE(usb, id_table); 32 33static struct usb_driver navman_driver = { 34 .name = "navman", 35 .probe = usb_serial_probe, 36 .disconnect = usb_serial_disconnect, 37 .id_table = id_table, 38 .no_dynamic_id = 1, 39}; 40 41static void navman_read_int_callback(struct urb *urb) 42{ 43 struct usb_serial_port *port = urb->context; 44 unsigned char *data = urb->transfer_buffer; 45 struct tty_struct *tty; 46 int status = urb->status; 47 int result; 48 49 switch (status) { 50 case 0: 51 /* success */ 52 break; 53 case -ECONNRESET: 54 case -ENOENT: 55 case -ESHUTDOWN: 56 /* this urb is terminated, clean up */ 57 dbg("%s - urb shutting down with status: %d", 58 __func__, status); 59 return; 60 default: 61 dbg("%s - nonzero urb status received: %d", 62 __func__, status); 63 goto exit; 64 } 65 66 usb_serial_debug_data(debug, &port->dev, __func__, 67 urb->actual_length, data); 68 69 tty = tty_port_tty_get(&port->port); 70 if (tty && urb->actual_length) { 71 tty_insert_flip_string(tty, data, urb->actual_length); 72 tty_flip_buffer_push(tty); 73 } 74 tty_kref_put(tty); 75 76exit: 77 result = usb_submit_urb(urb, GFP_ATOMIC); 78 if (result) 79 dev_err(&urb->dev->dev, 80 "%s - Error %d submitting interrupt urb\n", 81 __func__, result); 82} 83 84static int navman_open(struct tty_struct *tty, struct usb_serial_port *port) 85{ 86 int result = 0; 87 88 dbg("%s - port %d", __func__, port->number); 89 90 if (port->interrupt_in_urb) { 91 dbg("%s - adding interrupt input for treo", __func__); 92 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 93 if (result) 94 dev_err(&port->dev, 95 "%s - failed submitting interrupt urb, error %d\n", 96 __func__, result); 97 } 98 return result; 99} 100 101static void navman_close(struct usb_serial_port *port) 102{ 103 dbg("%s - port %d", __func__, port->number); 104 105 usb_kill_urb(port->interrupt_in_urb); 106} 107 108static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, 109 const unsigned char *buf, int count) 110{ 111 dbg("%s - port %d", __func__, port->number); 112 113 /* 114 * This device can't write any data, only read from the device 115 */ 116 return -EOPNOTSUPP; 117} 118 119static struct usb_serial_driver navman_device = { 120 .driver = { 121 .owner = THIS_MODULE, 122 .name = "navman", 123 }, 124 .id_table = id_table, 125 .usb_driver = &navman_driver, 126 .num_ports = 1, 127 .open = navman_open, 128 .close = navman_close, 129 .write = navman_write, 130 .read_int_callback = navman_read_int_callback, 131}; 132 133static int __init navman_init(void) 134{ 135 int retval; 136 137 retval = usb_serial_register(&navman_device); 138 if (retval) 139 return retval; 140 retval = usb_register(&navman_driver); 141 if (retval) 142 usb_serial_deregister(&navman_device); 143 return retval; 144} 145 146static void __exit navman_exit(void) 147{ 148 usb_deregister(&navman_driver); 149 usb_serial_deregister(&navman_device); 150} 151 152module_init(navman_init); 153module_exit(navman_exit); 154MODULE_LICENSE("GPL"); 155 156module_param(debug, bool, S_IRUGO | S_IWUSR); 157MODULE_PARM_DESC(debug, "Debug enabled or not"); 158