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, struct pt_regs *regs) 36 { 37 struct usb_serial_port *port = urb->context; 38 unsigned char *data = urb->transfer_buffer; 39 struct tty_struct *tty; 40 int result; 41 42 switch (urb->status) { 43 case 0: 44 /* success */ 45 break; 46 case -ECONNRESET: 47 case -ENOENT: 48 case -ESHUTDOWN: 49 /* this urb is terminated, clean up */ 50 dbg("%s - urb shutting down with status: %d", 51 __FUNCTION__, urb->status); 52 return; 53 default: 54 dbg("%s - nonzero urb status received: %d", 55 __FUNCTION__, urb->status); 56 goto exit; 57 } 58 59 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, 60 urb->actual_length, data); 61 62 tty = port->tty; 63 if (tty && urb->actual_length) { 64 tty_buffer_request_room(tty, urb->actual_length); 65 tty_insert_flip_string(tty, data, urb->actual_length); 66 tty_flip_buffer_push(tty); 67 } 68 69 exit: 70 result = usb_submit_urb(urb, GFP_ATOMIC); 71 if (result) 72 dev_err(&urb->dev->dev, 73 "%s - Error %d submitting interrupt urb\n", 74 __FUNCTION__, result); 75 } 76 77 static int navman_open(struct usb_serial_port *port, struct file *filp) 78 { 79 int result = 0; 80 81 dbg("%s - port %d", __FUNCTION__, port->number); 82 83 if (port->interrupt_in_urb) { 84 dbg("%s - adding interrupt input for treo", __FUNCTION__); 85 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 86 if (result) 87 dev_err(&port->dev, 88 "%s - failed submitting interrupt urb, error %d\n", 89 __FUNCTION__, result); 90 } 91 return result; 92 } 93 94 static void navman_close(struct usb_serial_port *port, struct file *filp) 95 { 96 dbg("%s - port %d", __FUNCTION__, port->number); 97 98 if (port->interrupt_in_urb) 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 .num_interrupt_in = NUM_DONT_CARE, 124 .num_bulk_in = NUM_DONT_CARE, 125 .num_bulk_out = NUM_DONT_CARE, 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 }; 132 133 static 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 } 145 146 static void __exit navman_exit(void) 147 { 148 usb_deregister(&navman_driver); 149 usb_serial_deregister(&navman_device); 150 } 151 152 module_init(navman_init); 153 module_exit(navman_exit); 154 MODULE_LICENSE("GPL"); 155 156 module_param(debug, bool, S_IRUGO | S_IWUSR); 157 MODULE_PARM_DESC(debug, "Debug enabled or not"); 158