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