linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * IgorPlug-USB IR Receiver

 *

 * Copyright (C) 2014 Sean Young <sean@mess.org>

 *

 * Supports the standard homebrew IgorPlugUSB receiver with Igor's firmware.

 * See http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm

 *

 * Based on the lirc_igorplugusb.c driver:

 *  Copyright (C) 2004 Jan M. Hochstein

 *  <hochstein@algo.informatik.tu-darmstadt.de>

 */

#include <linux/device.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/usb.h>

#include <linux/usb/input.h>

#include <media/rc-core.h>

​

#define DRIVER_DESC     "IgorPlug-USB IR Receiver"

#define DRIVER_NAME     "igorplugusb"

​

#define HEADERLEN       3

#define BUFLEN          36

#define MAX_PACKET      (HEADERLEN + BUFLEN)

​

#define SET_INFRABUFFER_EMPTY   1

#define GET_INFRACODE       2

​

​

struct igorplugusb {

    struct rc_dev *rc;

    struct device *dev;

​

    struct urb *urb;

    struct usb_ctrlrequest request;

​

    struct timer_list timer;

​

    uint8_t buf_in[MAX_PACKET];

​

    char phys[64];

};

​

static void igorplugusb_cmd(struct igorplugusb *ir, int cmd);

​

static void igorplugusb_irdata(struct igorplugusb *ir, unsigned len)

{

    struct ir_raw_event rawir = {};

    unsigned i, start, overflow;

​

    dev_dbg(ir->dev, "irdata: %*ph (len=%u)", len, ir->buf_in, len);

​

    /*

     * If more than 36 pulses and spaces follow each other, the igorplugusb

     * overwrites its buffer from the beginning. The overflow value is the

     * last offset which was not overwritten. Everything from this offset

     * onwards occurred before everything until this offset.

     */

    overflow = ir->buf_in[2];

    i = start = overflow + HEADERLEN;

​