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 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/tty.h> 14 #include <linux/tty_flip.h> 15 #include <linux/module.h> 16 #include <linux/usb.h> 17 #include <linux/usb/serial.h> 18 19 static int debug; 20 21 static struct usb_device_id id_table [] = { 22 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ 23 { }, 24 }; 25 MODULE_DEVICE_TABLE(usb, id_table); 26 27 static struct usb_driver navman_driver = { 28 .name = "navman", 29 .probe = usb_serial_probe, 30 .disconnect = usb_serial_disconnect, 31 .id_table = id_table, 32 .no_dynamic_id = 1, 33 }; 34 35 static void navman_read_int_callback(struct urb *urb) 36 { 37 struct usb_serial_port *port = urb->context; 38 unsigned char *data = urb->transfer_buffer; 39 struct tty_struct *tty; 40 int status = urb->status; 41 int result; 42 43 switch (status) { 44 case 0: 45 /* success */ 46 break; 47 case -ECONNRESET: 48 case -ENOENT: 49 case -ESHUTDOWN: 50 /* this urb is terminated, clean up */ 51 dbg("%s - urb shutting down with status: %d", 52 __FUNCTION__, status); 53 return; 54 default: 55 dbg("%s - nonzero urb status received: %d", 56 __FUNCTION__, status); 57 goto exit; 58 } 59 60 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, 61 urb->actual_length, data); 62 63 tty = port->tty; 64 if (tty && urb->actual_length) { 65 tty_buffer_request_room(tty, urb->actual_length); 66 tty_insert_flip_string(tty, data, urb->actual_length); 67 tty_flip_buffer_push(tty); 68 } 69 70 exit: 71 result = usb_submit_urb(urb, GFP_ATOMIC); 72 if (result) 73 dev_err(&urb->dev->dev, 74 "%s - Error %d submitting interrupt urb\n", 75 __FUNCTION__, result); 76 } 77 78 static int navman_open(struct usb_serial_port *port, struct file *filp) 79 { 80 int result = 0; 81 82 dbg("%s - port %d", __FUNCTION__, port->number); 83 84 if (port->interrupt_in_urb) { 85 dbg("%s - adding interrupt input for treo", __FUNCTION__); 86 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 87 if (result) 88 dev_err(&port->dev, 89 "%s - failed submitting interrupt urb, error %d\n", 90 __FUNCTION__, result); 91 } 92 return result; 93 } 94 95 static void navman_close(struct usb_serial_port *port, struct file *filp) 96 { 97 dbg("%s - port %d", __FUNCTION__, port->number); 98 99 usb_kill_urb(port->interrupt_in_urb); 100 } 101 102 static int navman_write(struct usb_serial_port *port, 103 const unsigned char *buf, int count) 104 { 105 dbg("%s - port %d", __FUNCTION__, port->number); 106 107 /* 108 * This device can't write any data, only read from the device 109 * so we just silently eat all data sent to us and say it was 110 * successfully sent. 111 * Evil, I know, but do you have a better idea? 112 */ 113 114 return count; 115 } 116 117 static struct usb_serial_driver navman_device = { 118 .driver = { 119 .owner = THIS_MODULE, 120 .name = "navman", 121 }, 122 .id_table = id_table, 123 .usb_driver = &navman_driver, 124 .num_interrupt_in = NUM_DONT_CARE, 125 .num_bulk_in = NUM_DONT_CARE, 126 .num_bulk_out = NUM_DONT_CARE, 127 .num_ports = 1, 128 .open = navman_open, 129 .close = navman_close, 130 .write = navman_write, 131 .read_int_callback = navman_read_int_callback, 132 }; 133 134 static int __init navman_init(void) 135 { 136 int retval; 137 138 retval = usb_serial_register(&navman_device); 139 if (retval) 140 return retval; 141 retval = usb_register(&navman_driver); 142 if (retval) 143 usb_serial_deregister(&navman_device); 144 return retval; 145 } 146 147 static void __exit navman_exit(void) 148 { 149 usb_deregister(&navman_driver); 150 usb_serial_deregister(&navman_device); 151 } 152 153 module_init(navman_init); 154 module_exit(navman_exit); 155 MODULE_LICENSE("GPL"); 156 157 module_param(debug, bool, S_IRUGO | S_IWUSR); 158 MODULE_PARM_DESC(debug, "Debug enabled or not"); 159