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/kernel.h> 16 #include <linux/init.h> 17 #include <linux/tty.h> 18 #include <linux/tty_flip.h> 19 #include <linux/module.h> 20 #include <linux/usb.h> 21 #include <linux/usb/serial.h> 22 23 static int debug; 24 25 static struct usb_device_id id_table [] = { 26 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ 27 { }, 28 }; 29 MODULE_DEVICE_TABLE(usb, id_table); 30 31 static struct usb_driver navman_driver = { 32 .name = "navman", 33 .probe = usb_serial_probe, 34 .disconnect = usb_serial_disconnect, 35 .id_table = id_table, 36 .no_dynamic_id = 1, 37 }; 38 39 static void navman_read_int_callback(struct urb *urb) 40 { 41 struct usb_serial_port *port = urb->context; 42 unsigned char *data = urb->transfer_buffer; 43 struct tty_struct *tty; 44 int status = urb->status; 45 int result; 46 47 switch (status) { 48 case 0: 49 /* success */ 50 break; 51 case -ECONNRESET: 52 case -ENOENT: 53 case -ESHUTDOWN: 54 /* this urb is terminated, clean up */ 55 dbg("%s - urb shutting down with status: %d", 56 __func__, status); 57 return; 58 default: 59 dbg("%s - nonzero urb status received: %d", 60 __func__, status); 61 goto exit; 62 } 63 64 usb_serial_debug_data(debug, &port->dev, __func__, 65 urb->actual_length, data); 66 67 tty = tty_port_tty_get(&port->port); 68 if (tty && urb->actual_length) { 69 tty_buffer_request_room(tty, urb->actual_length); 70 tty_insert_flip_string(tty, data, urb->actual_length); 71 tty_flip_buffer_push(tty); 72 } 73 tty_kref_put(tty); 74 75 exit: 76 result = usb_submit_urb(urb, GFP_ATOMIC); 77 if (result) 78 dev_err(&urb->dev->dev, 79 "%s - Error %d submitting interrupt urb\n", 80 __func__, result); 81 } 82 83 static int navman_open(struct tty_struct *tty, 84 struct usb_serial_port *port, struct file *filp) 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 } 100 101 static void navman_close(struct tty_struct *tty, 102 struct usb_serial_port *port, struct file *filp) 103 { 104 dbg("%s - port %d", __func__, port->number); 105 106 usb_kill_urb(port->interrupt_in_urb); 107 } 108 109 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, 110 const unsigned char *buf, int count) 111 { 112 dbg("%s - port %d", __func__, port->number); 113 114 /* 115 * This device can't write any data, only read from the device 116 */ 117 return -EOPNOTSUPP; 118 } 119 120 static struct usb_serial_driver navman_device = { 121 .driver = { 122 .owner = THIS_MODULE, 123 .name = "navman", 124 }, 125 .id_table = id_table, 126 .usb_driver = &navman_driver, 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