linux-imx

// SPDX-License-Identifier: GPL-2.0+

//

// Copyright (C) 2018 Sean Young <sean@mess.org>

​

#include <linux/module.h>

#include <linux/usb.h>

#include <linux/usb/input.h>

#include <media/rc-core.h>

​

/* Each bit is 250us */

#define BIT_DURATION 250000

​

struct imon {

    struct device *dev;

    struct urb *ir_urb;

    struct rc_dev *rcdev;

    u8 ir_buf[8] __aligned(__alignof__(u64));

    char phys[64];

};

​

/*

 * The first 5 bytes of data represent IR pulse or space. Each bit, starting

 * from highest bit in the first byte, represents 250µs of data. It is 1

 * for space and 0 for pulse.

 *

 * The station sends 10 packets, and the 7th byte will be number 1 to 10, so

 * when we receive 10 we assume all the data has arrived.

 */

static void imon_ir_data(struct imon *imon)

{

    struct ir_raw_event rawir = {};

    u64 d = be64_to_cpup((__be64 *)imon->ir_buf) >> 24;

    int offset = 40;

    int bit;

​

    dev_dbg(imon->dev, "data: %*ph", 8, imon->ir_buf);

​

    do {

        bit = fls64(d & (BIT_ULL(offset) - 1));

        if (bit < offset) {

            dev_dbg(imon->dev, "pulse: %d bits", offset - bit);

            rawir.pulse = true;

            rawir.duration = (offset - bit) * BIT_DURATION;

            ir_raw_event_store_with_filter(imon->rcdev, &rawir);

​

            if (bit == 0)

                break;

​

            offset = bit;

        }

​

        bit = fls64(~d & (BIT_ULL(offset) - 1));

        dev_dbg(imon->dev, "space: %d bits", offset - bit);

​

        rawir.pulse = false;

        rawir.duration = (offset - bit) * BIT_DURATION;

        ir_raw_event_store_with_filter(imon->rcdev, &rawir);

​

        offset = bit;

    } while (offset > 0);

​

    if (imon->ir_buf[7] == 0x0a) {

        ir_raw_event_set_idle(imon->rcdev, true);