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/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 const struct usb_device_id id_table[] = { 24 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ 25 { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */ 26 { }, 27 }; 28 MODULE_DEVICE_TABLE(usb, id_table); 29 navman_read_int_callback(struct urb * urb)30 static void navman_read_int_callback(struct urb *urb) 31 { 32 struct usb_serial_port *port = urb->context; 33 unsigned char *data = urb->transfer_buffer; 34 int status = urb->status; 35 int result; 36 37 switch (status) { 38 case 0: 39 /* success */ 40 break; 41 case -ECONNRESET: 42 case -ENOENT: 43 case -ESHUTDOWN: 44 /* this urb is terminated, clean up */ 45 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 46 __func__, status); 47 return; 48 default: 49 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 50 __func__, status); 51 goto exit; 52 } 53 54 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 55 56 if (urb->actual_length) { 57 tty_insert_flip_string(&port->port, data, urb->actual_length); 58 tty_flip_buffer_push(&port->port); 59 } 60 61 exit: 62 result = usb_submit_urb(urb, GFP_ATOMIC); 63 if (result) 64 dev_err(&urb->dev->dev, 65 "%s - Error %d submitting interrupt urb\n", 66 __func__, result); 67 } 68 navman_open(struct tty_struct * tty,struct usb_serial_port * port)69 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port) 70 { 71 int result = 0; 72 73 if (port->interrupt_in_urb) { 74 dev_dbg(&port->dev, "%s - adding interrupt input for treo\n", 75 __func__); 76 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 77 if (result) 78 dev_err(&port->dev, 79 "%s - failed submitting interrupt urb, error %d\n", 80 __func__, result); 81 } 82 return result; 83 } 84 navman_close(struct usb_serial_port * port)85 static void navman_close(struct usb_serial_port *port) 86 { 87 usb_kill_urb(port->interrupt_in_urb); 88 } 89 navman_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)90 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, 91 const unsigned char *buf, int count) 92 { 93 /* 94 * This device can't write any data, only read from the device 95 */ 96 return -EOPNOTSUPP; 97 } 98 99 static struct usb_serial_driver navman_device = { 100 .driver = { 101 .owner = THIS_MODULE, 102 .name = "navman", 103 }, 104 .id_table = id_table, 105 .num_ports = 1, 106 .open = navman_open, 107 .close = navman_close, 108 .write = navman_write, 109 .read_int_callback = navman_read_int_callback, 110 }; 111 112 static struct usb_serial_driver * const serial_drivers[] = { 113 &navman_device, NULL 114 }; 115 116 module_usb_serial_driver(serial_drivers, id_table); 117 118 MODULE_LICENSE("GPL"); 119