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528222d853
rc-core kapi uses nanoseconds for infrared durations for receiving, and microseconds for sending. The uapi already uses microseconds for both, so this patch does not change the uapi. Infrared durations do not need nanosecond resolution. IR protocols do not have durations shorter than about 100 microseconds. Some IR hardware offers 250 microseconds resolution, which is sufficient for most protocols. Better hardware has 50 microsecond resolution and is enough for every protocol I am aware off. Unify on microseconds everywhere. This simplifies the code since less conversion between microseconds and nanoseconds needs to be done. This affects: - rx_resolution member of struct rc_dev - timeout member of struct rc_dev - duration member in struct ir_raw_event Cc: "Bruno Prémont" <bonbons@linux-vserver.org> Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Patrick Lerda <patrick9876@free.fr> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Neil Armstrong <narmstrong@baylibre.com> Cc: Jerome Brunet <jbrunet@baylibre.com> Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Cc: Sean Wang <sean.wang@mediatek.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Chen-Yu Tsai <wens@csie.org> Cc: "David Härdeman" <david@hardeman.nu> Cc: Benjamin Valentin <benpicco@googlemail.com> Cc: Antti Palosaari <crope@iki.fi> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
268 lines
6.5 KiB
C
268 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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// ir-imon-decoder.c - handle iMon protocol
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//
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// Copyright (C) 2018 by Sean Young <sean@mess.org>
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include "rc-core-priv.h"
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#define IMON_UNIT 416 /* us */
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#define IMON_BITS 30
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#define IMON_CHKBITS (BIT(30) | BIT(25) | BIT(24) | BIT(22) | \
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BIT(21) | BIT(20) | BIT(19) | BIT(18) | \
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BIT(17) | BIT(16) | BIT(14) | BIT(13) | \
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BIT(12) | BIT(11) | BIT(10) | BIT(9))
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/*
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* This protocol has 30 bits. The format is one IMON_UNIT header pulse,
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* followed by 30 bits. Each bit is one IMON_UNIT check field, and then
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* one IMON_UNIT field with the actual bit (1=space, 0=pulse).
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* The check field is always space for some bits, for others it is pulse if
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* both the preceding and current bit are zero, else space. IMON_CHKBITS
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* defines which bits are of type check.
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*
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* There is no way to distinguish an incomplete message from one where
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* the lower bits are all set, iow. the last pulse is for the lowest
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* bit which is 0.
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*/
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enum imon_state {
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STATE_INACTIVE,
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STATE_BIT_CHK,
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STATE_BIT_START,
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STATE_FINISHED,
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STATE_ERROR,
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};
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static void ir_imon_decode_scancode(struct rc_dev *dev)
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{
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struct imon_dec *imon = &dev->raw->imon;
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/* Keyboard/Mouse toggle */
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if (imon->bits == 0x299115b7)
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imon->stick_keyboard = !imon->stick_keyboard;
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if ((imon->bits & 0xfc0000ff) == 0x680000b7) {
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int rel_x, rel_y;
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u8 buf;
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buf = imon->bits >> 16;
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rel_x = (buf & 0x08) | (buf & 0x10) >> 2 |
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(buf & 0x20) >> 4 | (buf & 0x40) >> 6;
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if (imon->bits & 0x02000000)
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rel_x |= ~0x0f;
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buf = imon->bits >> 8;
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rel_y = (buf & 0x08) | (buf & 0x10) >> 2 |
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(buf & 0x20) >> 4 | (buf & 0x40) >> 6;
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if (imon->bits & 0x01000000)
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rel_y |= ~0x0f;
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if (rel_x && rel_y && imon->stick_keyboard) {
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if (abs(rel_y) > abs(rel_x))
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imon->bits = rel_y > 0 ?
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0x289515b7 : /* KEY_DOWN */
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0x2aa515b7; /* KEY_UP */
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else
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imon->bits = rel_x > 0 ?
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0x2ba515b7 : /* KEY_RIGHT */
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0x29a515b7; /* KEY_LEFT */
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}
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if (!imon->stick_keyboard) {
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input_report_rel(dev->input_dev, REL_X, rel_x);
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input_report_rel(dev->input_dev, REL_Y, rel_y);
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input_report_key(dev->input_dev, BTN_LEFT,
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(imon->bits & 0x00010000) != 0);
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input_report_key(dev->input_dev, BTN_RIGHT,
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(imon->bits & 0x00040000) != 0);
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}
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}
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rc_keydown(dev, RC_PROTO_IMON, imon->bits, 0);
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}
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/**
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* ir_imon_decode() - Decode one iMON pulse or space
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* @dev: the struct rc_dev descriptor of the device
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* @ev: the struct ir_raw_event descriptor of the pulse/space
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*
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* This function returns -EINVAL if the pulse violates the state machine
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*/
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static int ir_imon_decode(struct rc_dev *dev, struct ir_raw_event ev)
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{
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struct imon_dec *data = &dev->raw->imon;
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if (!is_timing_event(ev)) {
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if (ev.reset)
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data->state = STATE_INACTIVE;
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return 0;
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}
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dev_dbg(&dev->dev,
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"iMON decode started at state %d bitno %d (%uus %s)\n",
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data->state, data->count, ev.duration, TO_STR(ev.pulse));
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/*
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* Since iMON protocol is a series of bits, if at any point
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* we encounter an error, make sure that any remaining bits
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* aren't parsed as a scancode made up of less bits.
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*
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* Note that if the stick is held, then the remote repeats
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* the scancode with about 12ms between them. So, make sure
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* we have at least 10ms of space after an error. That way,
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* we're at a new scancode.
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*/
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if (data->state == STATE_ERROR) {
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if (!ev.pulse && ev.duration > MS_TO_US(10))
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data->state = STATE_INACTIVE;
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return 0;
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}
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for (;;) {
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if (!geq_margin(ev.duration, IMON_UNIT, IMON_UNIT / 2))
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return 0;
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decrease_duration(&ev, IMON_UNIT);
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switch (data->state) {
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case STATE_INACTIVE:
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if (ev.pulse) {
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data->state = STATE_BIT_CHK;
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data->bits = 0;
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data->count = IMON_BITS;
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}
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break;
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case STATE_BIT_CHK:
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if (IMON_CHKBITS & BIT(data->count))
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data->last_chk = ev.pulse;
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else if (ev.pulse)
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goto err_out;
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data->state = STATE_BIT_START;
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break;
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case STATE_BIT_START:
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data->bits <<= 1;
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if (!ev.pulse)
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data->bits |= 1;
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if (IMON_CHKBITS & BIT(data->count)) {
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if (data->last_chk != !(data->bits & 3))
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goto err_out;
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}
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if (!data->count--)
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data->state = STATE_FINISHED;
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else
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data->state = STATE_BIT_CHK;
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break;
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case STATE_FINISHED:
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if (ev.pulse)
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goto err_out;
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ir_imon_decode_scancode(dev);
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data->state = STATE_INACTIVE;
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break;
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}
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}
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err_out:
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dev_dbg(&dev->dev,
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"iMON decode failed at state %d bitno %d (%uus %s)\n",
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data->state, data->count, ev.duration, TO_STR(ev.pulse));
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data->state = STATE_ERROR;
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return -EINVAL;
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}
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/**
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* ir_imon_encode() - Encode a scancode as a stream of raw events
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*
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* @protocol: protocol to encode
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* @scancode: scancode to encode
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* @events: array of raw ir events to write into
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* @max: maximum size of @events
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*
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* Returns: The number of events written.
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* -ENOBUFS if there isn't enough space in the array to fit the
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* encoding. In this case all @max events will have been written.
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*/
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static int ir_imon_encode(enum rc_proto protocol, u32 scancode,
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struct ir_raw_event *events, unsigned int max)
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{
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struct ir_raw_event *e = events;
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int i, pulse;
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if (!max--)
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return -ENOBUFS;
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init_ir_raw_event_duration(e, 1, IMON_UNIT);
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for (i = IMON_BITS; i >= 0; i--) {
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if (BIT(i) & IMON_CHKBITS)
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pulse = !(scancode & (BIT(i) | BIT(i + 1)));
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else
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pulse = 0;
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if (pulse == e->pulse) {
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e->duration += IMON_UNIT;
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} else {
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if (!max--)
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return -ENOBUFS;
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init_ir_raw_event_duration(++e, pulse, IMON_UNIT);
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}
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pulse = !(scancode & BIT(i));
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if (pulse == e->pulse) {
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e->duration += IMON_UNIT;
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} else {
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if (!max--)
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return -ENOBUFS;
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init_ir_raw_event_duration(++e, pulse, IMON_UNIT);
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}
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}
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if (e->pulse)
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e++;
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return e - events;
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}
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static int ir_imon_register(struct rc_dev *dev)
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{
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struct imon_dec *imon = &dev->raw->imon;
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imon->stick_keyboard = false;
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return 0;
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}
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static struct ir_raw_handler imon_handler = {
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.protocols = RC_PROTO_BIT_IMON,
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.decode = ir_imon_decode,
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.encode = ir_imon_encode,
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.carrier = 38000,
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.raw_register = ir_imon_register,
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.min_timeout = IMON_UNIT * IMON_BITS * 2,
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};
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static int __init ir_imon_decode_init(void)
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{
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ir_raw_handler_register(&imon_handler);
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pr_info("IR iMON protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_imon_decode_exit(void)
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{
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ir_raw_handler_unregister(&imon_handler);
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}
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module_init(ir_imon_decode_init);
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module_exit(ir_imon_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Sean Young <sean@mess.org>");
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MODULE_DESCRIPTION("iMON IR protocol decoder");
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