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 bool debug; 25 26 static const struct usb_device_id id_table[] = { 27 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ 28 { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */ 29 { }, 30 }; 31 MODULE_DEVICE_TABLE(usb, id_table); 32 33 static void navman_read_int_callback(struct urb *urb) 34 { 35 struct usb_serial_port *port = urb->context; 36 unsigned char *data = urb->transfer_buffer; 37 struct tty_struct *tty; 38 int status = urb->status; 39 int result; 40 41 switch (status) { 42 case 0: 43 /* success */ 44 break; 45 case -ECONNRESET: 46 case -ENOENT: 47 case -ESHUTDOWN: 48 /* this urb is terminated, clean up */ 49 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 50 __func__, status); 51 return; 52 default: 53 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 54 __func__, status); 55 goto exit; 56 } 57 58 usb_serial_debug_data(debug, &port->dev, __func__, 59 urb->actual_length, data); 60 61 tty = tty_port_tty_get(&port->port); 62 if (tty && urb->actual_length) { 63 tty_insert_flip_string(tty, data, urb->actual_length); 64 tty_flip_buffer_push(tty); 65 } 66 tty_kref_put(tty); 67 68 exit: 69 result = usb_submit_urb(urb, GFP_ATOMIC); 70 if (result) 71 dev_err(&urb->dev->dev, 72 "%s - Error %d submitting interrupt urb\n", 73 __func__, result); 74 } 75 76 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port) 77 { 78 int result = 0; 79 80 if (port->interrupt_in_urb) { 81 dev_dbg(&port->dev, "%s - adding interrupt input for treo\n", 82 __func__); 83 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 84 if (result) 85 dev_err(&port->dev, 86 "%s - failed submitting interrupt urb, error %d\n", 87 __func__, result); 88 } 89 return result; 90 } 91 92 static void navman_close(struct usb_serial_port *port) 93 { 94 usb_kill_urb(port->interrupt_in_urb); 95 } 96 97 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, 98 const unsigned char *buf, int count) 99 { 100 /* 101 * This device can't write any data, only read from the device 102 */ 103 return -EOPNOTSUPP; 104 } 105 106 static struct usb_serial_driver navman_device = { 107 .driver = { 108 .owner = THIS_MODULE, 109 .name = "navman", 110 }, 111 .id_table = id_table, 112 .num_ports = 1, 113 .open = navman_open, 114 .close = navman_close, 115 .write = navman_write, 116 .read_int_callback = navman_read_int_callback, 117 }; 118 119 static struct usb_serial_driver * const serial_drivers[] = { 120 &navman_device, NULL 121 }; 122 123 module_usb_serial_driver(serial_drivers, id_table); 124 125 MODULE_LICENSE("GPL"); 126 127 module_param(debug, bool, S_IRUGO | S_IWUSR); 128 MODULE_PARM_DESC(debug, "Debug enabled or not"); 129