cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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navman.c (2739B)

      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");