1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Navman Serial USB driver 4 * 5 * Copyright (C) 2006 Greg Kroah-Hartman <gregkh@suse.de> 6 * 7 * TODO: 8 * Add termios method that uses copy_hw but also kills all echo 9 * flags as the navman is rx only so cannot echo. 10 */ 11 12 #include <linux/gfp.h> 13 #include <linux/kernel.h> 14 #include <linux/tty.h> 15 #include <linux/tty_flip.h> 16 #include <linux/module.h> 17 #include <linux/usb.h> 18 #include <linux/usb/serial.h> 19 20 static const struct usb_device_id id_table[] = { 21 { USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */ 22 { USB_DEVICE(0x0df7, 0x0900) }, /* Mobile Action i-gotU */ 23 { }, 24 }; 25 MODULE_DEVICE_TABLE(usb, id_table); 26 27 static void navman_read_int_callback(struct urb *urb) 28 { 29 struct usb_serial_port *port = urb->context; 30 unsigned char *data = urb->transfer_buffer; 31 int status = urb->status; 32 int result; 33 34 switch (status) { 35 case 0: 36 /* success */ 37 break; 38 case -ECONNRESET: 39 case -ENOENT: 40 case -ESHUTDOWN: 41 /* this urb is terminated, clean up */ 42 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 43 __func__, status); 44 return; 45 default: 46 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 47 __func__, status); 48 goto exit; 49 } 50 51 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 52 53 if (urb->actual_length) { 54 tty_insert_flip_string(&port->port, data, urb->actual_length); 55 tty_flip_buffer_push(&port->port); 56 } 57 58 exit: 59 result = usb_submit_urb(urb, GFP_ATOMIC); 60 if (result) 61 dev_err(&urb->dev->dev, 62 "%s - Error %d submitting interrupt urb\n", 63 __func__, result); 64 } 65 66 static int navman_open(struct tty_struct *tty, struct usb_serial_port *port) 67 { 68 int result = 0; 69 70 if (port->interrupt_in_urb) { 71 dev_dbg(&port->dev, "%s - adding interrupt input for treo\n", 72 __func__); 73 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 74 if (result) 75 dev_err(&port->dev, 76 "%s - failed submitting interrupt urb, error %d\n", 77 __func__, result); 78 } 79 return result; 80 } 81 82 static void navman_close(struct usb_serial_port *port) 83 { 84 usb_kill_urb(port->interrupt_in_urb); 85 } 86 87 static int navman_write(struct tty_struct *tty, struct usb_serial_port *port, 88 const unsigned char *buf, int count) 89 { 90 /* 91 * This device can't write any data, only read from the device 92 */ 93 return -EOPNOTSUPP; 94 } 95 96 static struct usb_serial_driver navman_device = { 97 .driver = { 98 .owner = THIS_MODULE, 99 .name = "navman", 100 }, 101 .id_table = id_table, 102 .num_ports = 1, 103 .open = navman_open, 104 .close = navman_close, 105 .write = navman_write, 106 .read_int_callback = navman_read_int_callback, 107 }; 108 109 static struct usb_serial_driver * const serial_drivers[] = { 110 &navman_device, NULL 111 }; 112 113 module_usb_serial_driver(serial_drivers, id_table); 114 115 MODULE_LICENSE("GPL v2"); 116