LXR linux/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 <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
  20static 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};
  25MODULE_DEVICE_TABLE(usb, id_table);
  26
  27static 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
  58exit:
  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
  66static 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
  82static void navman_close(struct usb_serial_port *port)
  83{
  84        usb_kill_urb(port->interrupt_in_urb);
  85}
  86
  87static 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
  96static 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
 109static struct usb_serial_driver * const serial_drivers[] = {
 110        &navman_device, NULL
 111};
 112
 113module_usb_serial_driver(serial_drivers, id_table);
 114
 115MODULE_LICENSE("GPL v2");
 116