drivers/usb/serial/navman.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Navman Serial USB driver
   4  *
   5  * Copyright (C) 2006 Greg Kroah-Hartman <[email protected]>
   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");