![Sean Young](/assets/img/avatar_default.png)
Add the capability to encode Sanyo scancodes as raw events. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
247 lines
6.4 KiB
C
247 lines
6.4 KiB
C
/* ir-sanyo-decoder.c - handle SANYO IR Pulse/Space protocol
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*
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* Copyright (C) 2011 by Mauro Carvalho Chehab
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This protocol uses the NEC protocol timings. However, data is formatted as:
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* 13 bits Custom Code
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* 13 bits NOT(Custom Code)
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* 8 bits Key data
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* 8 bits NOT(Key data)
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*
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* According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon
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* Information for this protocol is available at the Sanyo LC7461 datasheet.
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*/
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#include <linux/module.h>
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#include <linux/bitrev.h>
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#include "rc-core-priv.h"
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#define SANYO_NBITS (13+13+8+8)
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#define SANYO_UNIT 562500 /* ns */
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#define SANYO_HEADER_PULSE (16 * SANYO_UNIT)
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#define SANYO_HEADER_SPACE (8 * SANYO_UNIT)
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#define SANYO_BIT_PULSE (1 * SANYO_UNIT)
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#define SANYO_BIT_0_SPACE (1 * SANYO_UNIT)
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#define SANYO_BIT_1_SPACE (3 * SANYO_UNIT)
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#define SANYO_REPEAT_SPACE (150 * SANYO_UNIT)
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#define SANYO_TRAILER_PULSE (1 * SANYO_UNIT)
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#define SANYO_TRAILER_SPACE (10 * SANYO_UNIT) /* in fact, 42 */
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enum sanyo_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_TRAILER_PULSE,
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STATE_TRAILER_SPACE,
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};
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/**
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* ir_sanyo_decode() - Decode one SANYO pulse or space
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* @dev: the struct rc_dev descriptor of the device
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* @duration: 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_sanyo_decode(struct rc_dev *dev, struct ir_raw_event ev)
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{
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struct sanyo_dec *data = &dev->raw->sanyo;
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u32 scancode;
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u16 address;
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u8 command, not_command;
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if (!is_timing_event(ev)) {
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if (ev.reset) {
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IR_dprintk(1, "SANYO event reset received. reset to state 0\n");
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data->state = STATE_INACTIVE;
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}
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return 0;
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}
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IR_dprintk(2, "SANYO 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, SANYO_HEADER_PULSE, SANYO_UNIT / 2)) {
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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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}
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break;
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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, SANYO_HEADER_SPACE, SANYO_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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break;
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case STATE_BIT_PULSE:
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if (!ev.pulse)
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break;
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if (!eq_margin(ev.duration, SANYO_BIT_PULSE, SANYO_UNIT / 2))
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break;
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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 (!data->count && geq_margin(ev.duration, SANYO_REPEAT_SPACE, SANYO_UNIT / 2)) {
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if (!dev->keypressed) {
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IR_dprintk(1, "SANYO discarding last key repeat: event after key up\n");
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} else {
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rc_repeat(dev);
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IR_dprintk(1, "SANYO repeat last key\n");
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data->state = STATE_INACTIVE;
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}
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return 0;
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}
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data->bits <<= 1;
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if (eq_margin(ev.duration, SANYO_BIT_1_SPACE, SANYO_UNIT / 2))
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data->bits |= 1;
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else if (!eq_margin(ev.duration, SANYO_BIT_0_SPACE, SANYO_UNIT / 2))
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break;
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data->count++;
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if (data->count == SANYO_NBITS)
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data->state = STATE_TRAILER_PULSE;
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else
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data->state = STATE_BIT_PULSE;
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return 0;
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case STATE_TRAILER_PULSE:
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if (!ev.pulse)
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break;
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if (!eq_margin(ev.duration, SANYO_TRAILER_PULSE, SANYO_UNIT / 2))
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break;
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data->state = STATE_TRAILER_SPACE;
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return 0;
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case STATE_TRAILER_SPACE:
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if (ev.pulse)
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break;
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if (!geq_margin(ev.duration, SANYO_TRAILER_SPACE, SANYO_UNIT / 2))
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break;
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address = bitrev16((data->bits >> 29) & 0x1fff) >> 3;
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/* not_address = bitrev16((data->bits >> 16) & 0x1fff) >> 3; */
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command = bitrev8((data->bits >> 8) & 0xff);
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not_command = bitrev8((data->bits >> 0) & 0xff);
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if ((command ^ not_command) != 0xff) {
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IR_dprintk(1, "SANYO checksum error: received 0x%08Lx\n",
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data->bits);
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data->state = STATE_INACTIVE;
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return 0;
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}
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scancode = address << 8 | command;
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IR_dprintk(1, "SANYO scancode: 0x%06x\n", scancode);
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rc_keydown(dev, RC_TYPE_SANYO, scancode, 0);
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data->state = STATE_INACTIVE;
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return 0;
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}
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IR_dprintk(1, "SANYO decode failed at count %d state %d (%uus %s)\n",
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data->count, 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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}
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static const struct ir_raw_timings_pd ir_sanyo_timings = {
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.header_pulse = SANYO_HEADER_PULSE,
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.header_space = SANYO_HEADER_SPACE,
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.bit_pulse = SANYO_BIT_PULSE,
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.bit_space[0] = SANYO_BIT_0_SPACE,
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.bit_space[1] = SANYO_BIT_1_SPACE,
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.trailer_pulse = SANYO_TRAILER_PULSE,
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.trailer_space = SANYO_TRAILER_SPACE,
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.msb_first = 1,
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};
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/**
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* ir_sanyo_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_sanyo_encode(enum rc_type 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 ret;
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u64 raw;
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raw = ((u64)(bitrev16(scancode >> 8) & 0xfff8) << (8 + 8 + 13 - 3)) |
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((u64)(bitrev16(~scancode >> 8) & 0xfff8) << (8 + 8 + 0 - 3)) |
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((bitrev8(scancode) & 0xff) << 8) |
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(bitrev8(~scancode) & 0xff);
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ret = ir_raw_gen_pd(&e, max, &ir_sanyo_timings, SANYO_NBITS, 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 sanyo_handler = {
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.protocols = RC_BIT_SANYO,
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.decode = ir_sanyo_decode,
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.encode = ir_sanyo_encode,
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};
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static int __init ir_sanyo_decode_init(void)
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{
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ir_raw_handler_register(&sanyo_handler);
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printk(KERN_INFO "IR SANYO protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_sanyo_decode_exit(void)
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{
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ir_raw_handler_unregister(&sanyo_handler);
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}
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module_init(ir_sanyo_decode_init);
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module_exit(ir_sanyo_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mauro Carvalho Chehab");
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MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
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MODULE_DESCRIPTION("SANYO IR protocol decoder");
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