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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation version 2 of the license this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 100 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.918357685@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
241 lines
5.8 KiB
C
241 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* ir-sony-decoder.c - handle Sony IR Pulse/Space protocol
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*
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* Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
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*/
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#include <linux/bitrev.h>
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#include <linux/module.h>
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#include "rc-core-priv.h"
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#define SONY_UNIT 600000 /* ns */
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#define SONY_HEADER_PULSE (4 * SONY_UNIT)
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#define SONY_HEADER_SPACE (1 * SONY_UNIT)
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#define SONY_BIT_0_PULSE (1 * SONY_UNIT)
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#define SONY_BIT_1_PULSE (2 * SONY_UNIT)
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#define SONY_BIT_SPACE (1 * SONY_UNIT)
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#define SONY_TRAILER_SPACE (10 * SONY_UNIT) /* minimum */
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enum sony_state {
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STATE_INACTIVE,
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STATE_HEADER_SPACE,
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STATE_BIT_PULSE,
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STATE_BIT_SPACE,
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STATE_FINISHED,
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};
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/**
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* ir_sony_decode() - Decode one Sony 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_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
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{
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struct sony_dec *data = &dev->raw->sony;
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enum rc_proto protocol;
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u32 scancode;
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u8 device, subdevice, function;
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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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if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2))
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goto out;
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dev_dbg(&dev->dev, "Sony decode started at state %d (%uus %s)\n",
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data->state, TO_US(ev.duration), TO_STR(ev.pulse));
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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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break;
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if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2))
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break;
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data->count = 0;
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data->state = STATE_HEADER_SPACE;
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return 0;
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case STATE_HEADER_SPACE:
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if (ev.pulse)
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break;
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if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2))
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break;
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data->state = STATE_BIT_PULSE;
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return 0;
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case STATE_BIT_PULSE:
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if (!ev.pulse)
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break;
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data->bits <<= 1;
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if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
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data->bits |= 1;
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else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2))
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break;
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data->count++;
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data->state = STATE_BIT_SPACE;
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return 0;
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case STATE_BIT_SPACE:
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if (ev.pulse)
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break;
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if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2))
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break;
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decrease_duration(&ev, SONY_BIT_SPACE);
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if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) {
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data->state = STATE_BIT_PULSE;
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return 0;
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}
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data->state = STATE_FINISHED;
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/* Fall through */
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case STATE_FINISHED:
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if (ev.pulse)
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break;
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if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2))
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break;
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switch (data->count) {
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case 12:
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if (!(dev->enabled_protocols & RC_PROTO_BIT_SONY12))
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goto finish_state_machine;
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device = bitrev8((data->bits << 3) & 0xF8);
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subdevice = 0;
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function = bitrev8((data->bits >> 4) & 0xFE);
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protocol = RC_PROTO_SONY12;
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break;
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case 15:
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if (!(dev->enabled_protocols & RC_PROTO_BIT_SONY15))
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goto finish_state_machine;
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device = bitrev8((data->bits >> 0) & 0xFF);
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subdevice = 0;
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function = bitrev8((data->bits >> 7) & 0xFE);
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protocol = RC_PROTO_SONY15;
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break;
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case 20:
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if (!(dev->enabled_protocols & RC_PROTO_BIT_SONY20))
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goto finish_state_machine;
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device = bitrev8((data->bits >> 5) & 0xF8);
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subdevice = bitrev8((data->bits >> 0) & 0xFF);
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function = bitrev8((data->bits >> 12) & 0xFE);
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protocol = RC_PROTO_SONY20;
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break;
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default:
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dev_dbg(&dev->dev, "Sony invalid bitcount %u\n",
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data->count);
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goto out;
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}
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scancode = device << 16 | subdevice << 8 | function;
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dev_dbg(&dev->dev, "Sony(%u) scancode 0x%05x\n", data->count,
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scancode);
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rc_keydown(dev, protocol, scancode, 0);
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goto finish_state_machine;
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}
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out:
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dev_dbg(&dev->dev, "Sony decode failed at state %d (%uus %s)\n",
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data->state, TO_US(ev.duration), TO_STR(ev.pulse));
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data->state = STATE_INACTIVE;
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return -EINVAL;
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finish_state_machine:
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data->state = STATE_INACTIVE;
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return 0;
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}
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static const struct ir_raw_timings_pl ir_sony_timings = {
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.header_pulse = SONY_HEADER_PULSE,
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.bit_space = SONY_BIT_SPACE,
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.bit_pulse[0] = SONY_BIT_0_PULSE,
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.bit_pulse[1] = SONY_BIT_1_PULSE,
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.trailer_space = SONY_TRAILER_SPACE + SONY_BIT_SPACE,
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.msb_first = 0,
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};
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/**
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* ir_sony_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_sony_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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u32 raw, len;
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int ret;
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if (protocol == RC_PROTO_SONY12) {
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raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9);
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len = 12;
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} else if (protocol == RC_PROTO_SONY15) {
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raw = (scancode & 0x7f) | ((scancode & 0xff0000) >> 9);
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len = 15;
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} else {
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raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9) |
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((scancode & 0xff00) << 4);
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len = 20;
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}
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ret = ir_raw_gen_pl(&e, max, &ir_sony_timings, len, raw);
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if (ret < 0)
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return ret;
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return e - events;
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}
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static struct ir_raw_handler sony_handler = {
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.protocols = RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 |
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RC_PROTO_BIT_SONY20,
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.decode = ir_sony_decode,
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.encode = ir_sony_encode,
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.carrier = 40000,
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.min_timeout = SONY_TRAILER_SPACE,
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};
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static int __init ir_sony_decode_init(void)
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{
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ir_raw_handler_register(&sony_handler);
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printk(KERN_INFO "IR Sony protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_sony_decode_exit(void)
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{
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ir_raw_handler_unregister(&sony_handler);
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}
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module_init(ir_sony_decode_init);
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module_exit(ir_sony_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
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MODULE_DESCRIPTION("Sony IR protocol decoder");
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