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 const struct usb_device_id id_table[] = { 25 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ 26 { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */ 27 { }, 28 }; 29 MODULE_DEVICE_TABLE(usb, id_table); 30 31 static void navman_read_int_callback(struct urb *urb) 32 { 33 struct usb_serial_port *port = urb->context; 34 unsigned char *data = urb->transfer_buffer; 35 struct tty_struct *tty; 36 int status = urb->status; 37 int result; 38 39 switch (status) { 40 case 0: 41 /* success */ 42 break; 43 case -ECONNRESET: 44 case -ENOENT: 45 case -ESHUTDOWN: 46 /* this urb is terminated, clean up */ 47 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 48 __func__, status); 49 return; 50 default: 51 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 52 __func__, status); 53 goto exit; 54 } 55 56 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 57 58 tty = tty_port_tty_get(&port->port); 59 if (tty && urb->actual_length) { 60 tty_insert_flip_string(tty, data, urb->actual_length); 61 tty_flip_buffer_push(tty); 62 } 63 tty_kref_put(tty); 64 65 exit: 66 result = usb_submit_urb(urb, GFP_ATOMIC); 67 if (result) 68 dev_err(&urb->dev->dev, 69 "%s - Error %d submitting interrupt urb\n", 70 __func__, result); 71 } 72 73 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port) 74 { 75 int result = 0; 76 77 if (port->interrupt_in_urb) { 78 dev_dbg(&port->dev, "%s - adding interrupt input for treo\n", 79 __func__); 80 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 81 if (result) 82 dev_err(&port->dev, 83 "%s - failed submitting interrupt urb, error %d\n", 84 __func__, result); 85 } 86 return result; 87 } 88 89 static void navman_close(struct usb_serial_port *port) 90 { 91 usb_kill_urb(port->interrupt_in_urb); 92 } 93 94 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, 95 const unsigned char *buf, int count) 96 { 97 /* 98 * This device can't write any data, only read from the device 99 */ 100 return -EOPNOTSUPP; 101 } 102 103 static struct usb_serial_driver navman_device = { 104 .driver = { 105 .owner = THIS_MODULE, 106 .name = "navman", 107 }, 108 .id_table = id_table, 109 .num_ports = 1, 110 .open = navman_open, 111 .close = navman_close, 112 .write = navman_write, 113 .read_int_callback = navman_read_int_callback, 114 }; 115 116 static struct usb_serial_driver * const serial_drivers[] = { 117 &navman_device, NULL 118 }; 119 120 module_usb_serial_driver(serial_drivers, id_table); 121 122 MODULE_LICENSE("GPL"); 123