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path: root/drivers/media/IR/ir-rc6-decoder.c
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Diffstat (limited to 'drivers/media/IR/ir-rc6-decoder.c')
-rw-r--r--drivers/media/IR/ir-rc6-decoder.c281
1 files changed, 0 insertions, 281 deletions
diff --git a/drivers/media/IR/ir-rc6-decoder.c b/drivers/media/IR/ir-rc6-decoder.c
deleted file mode 100644
index d25da91f44f..00000000000
--- a/drivers/media/IR/ir-rc6-decoder.c
+++ /dev/null
@@ -1,281 +0,0 @@
-/* ir-rc6-decoder.c - A decoder for the RC6 IR protocol
- *
- * Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
- *
- * 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.
- */
-
-#include "ir-core-priv.h"
-
-/*
- * This decoder currently supports:
- * RC6-0-16 (standard toggle bit in header)
- * RC6-6A-24 (no toggle bit)
- * RC6-6A-32 (MCE version with toggle bit in body)
- */
-
-#define RC6_UNIT 444444 /* us */
-#define RC6_HEADER_NBITS 4 /* not including toggle bit */
-#define RC6_0_NBITS 16
-#define RC6_6A_SMALL_NBITS 24
-#define RC6_6A_LARGE_NBITS 32
-#define RC6_PREFIX_PULSE (6 * RC6_UNIT)
-#define RC6_PREFIX_SPACE (2 * RC6_UNIT)
-#define RC6_BIT_START (1 * RC6_UNIT)
-#define RC6_BIT_END (1 * RC6_UNIT)
-#define RC6_TOGGLE_START (2 * RC6_UNIT)
-#define RC6_TOGGLE_END (2 * RC6_UNIT)
-#define RC6_MODE_MASK 0x07 /* for the header bits */
-#define RC6_STARTBIT_MASK 0x08 /* for the header bits */
-#define RC6_6A_MCE_TOGGLE_MASK 0x8000 /* for the body bits */
-
-enum rc6_mode {
- RC6_MODE_0,
- RC6_MODE_6A,
- RC6_MODE_UNKNOWN,
-};
-
-enum rc6_state {
- STATE_INACTIVE,
- STATE_PREFIX_SPACE,
- STATE_HEADER_BIT_START,
- STATE_HEADER_BIT_END,
- STATE_TOGGLE_START,
- STATE_TOGGLE_END,
- STATE_BODY_BIT_START,
- STATE_BODY_BIT_END,
- STATE_FINISHED,
-};
-
-static enum rc6_mode rc6_mode(struct rc6_dec *data)
-{
- switch (data->header & RC6_MODE_MASK) {
- case 0:
- return RC6_MODE_0;
- case 6:
- if (!data->toggle)
- return RC6_MODE_6A;
- /* fall through */
- default:
- return RC6_MODE_UNKNOWN;
- }
-}
-
-/**
- * ir_rc6_decode() - Decode one RC6 pulse or space
- * @input_dev: the struct input_dev descriptor of the device
- * @ev: the struct ir_raw_event descriptor of the pulse/space
- *
- * This function returns -EINVAL if the pulse violates the state machine
- */
-static int ir_rc6_decode(struct input_dev *input_dev, struct ir_raw_event ev)
-{
- struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
- struct rc6_dec *data = &ir_dev->raw->rc6;
- u32 scancode;
- u8 toggle;
-
- if (!(ir_dev->raw->enabled_protocols & IR_TYPE_RC6))
- return 0;
-
- if (!is_timing_event(ev)) {
- if (ev.reset)
- data->state = STATE_INACTIVE;
- return 0;
- }
-
- if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
- goto out;
-
-again:
- IR_dprintk(2, "RC6 decode started at state %i (%uus %s)\n",
- data->state, TO_US(ev.duration), TO_STR(ev.pulse));
-
- if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
- return 0;
-
- switch (data->state) {
-
- case STATE_INACTIVE:
- if (!ev.pulse)
- break;
-
- /* Note: larger margin on first pulse since each RC6_UNIT
- is quite short and some hardware takes some time to
- adjust to the signal */
- if (!eq_margin(ev.duration, RC6_PREFIX_PULSE, RC6_UNIT))
- break;
-
- data->state = STATE_PREFIX_SPACE;
- data->count = 0;
- return 0;
-
- case STATE_PREFIX_SPACE:
- if (ev.pulse)
- break;
-
- if (!eq_margin(ev.duration, RC6_PREFIX_SPACE, RC6_UNIT / 2))
- break;
-
- data->state = STATE_HEADER_BIT_START;
- return 0;
-
- case STATE_HEADER_BIT_START:
- if (!eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2))
- break;
-
- data->header <<= 1;
- if (ev.pulse)
- data->header |= 1;
- data->count++;
- data->state = STATE_HEADER_BIT_END;
- return 0;
-
- case STATE_HEADER_BIT_END:
- if (!is_transition(&ev, &ir_dev->raw->prev_ev))
- break;
-
- if (data->count == RC6_HEADER_NBITS)
- data->state = STATE_TOGGLE_START;
- else
- data->state = STATE_HEADER_BIT_START;
-
- decrease_duration(&ev, RC6_BIT_END);
- goto again;
-
- case STATE_TOGGLE_START:
- if (!eq_margin(ev.duration, RC6_TOGGLE_START, RC6_UNIT / 2))
- break;
-
- data->toggle = ev.pulse;
- data->state = STATE_TOGGLE_END;
- return 0;
-
- case STATE_TOGGLE_END:
- if (!is_transition(&ev, &ir_dev->raw->prev_ev) ||
- !geq_margin(ev.duration, RC6_TOGGLE_END, RC6_UNIT / 2))
- break;
-
- if (!(data->header & RC6_STARTBIT_MASK)) {
- IR_dprintk(1, "RC6 invalid start bit\n");
- break;
- }
-
- data->state = STATE_BODY_BIT_START;
- decrease_duration(&ev, RC6_TOGGLE_END);
- data->count = 0;
-
- switch (rc6_mode(data)) {
- case RC6_MODE_0:
- data->wanted_bits = RC6_0_NBITS;
- break;
- case RC6_MODE_6A:
- /* This might look weird, but we basically
- check the value of the first body bit to
- determine the number of bits in mode 6A */
- if ((!ev.pulse && !geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2)) ||
- geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
- data->wanted_bits = RC6_6A_LARGE_NBITS;
- else
- data->wanted_bits = RC6_6A_SMALL_NBITS;
- break;
- default:
- IR_dprintk(1, "RC6 unknown mode\n");
- goto out;
- }
- goto again;
-
- case STATE_BODY_BIT_START:
- if (!eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2))
- break;
-
- data->body <<= 1;
- if (ev.pulse)
- data->body |= 1;
- data->count++;
- data->state = STATE_BODY_BIT_END;
- return 0;
-
- case STATE_BODY_BIT_END:
- if (!is_transition(&ev, &ir_dev->raw->prev_ev))
- break;
-
- if (data->count == data->wanted_bits)
- data->state = STATE_FINISHED;
- else
- data->state = STATE_BODY_BIT_START;
-
- decrease_duration(&ev, RC6_BIT_END);
- goto again;
-
- case STATE_FINISHED:
- if (ev.pulse)
- break;
-
- switch (rc6_mode(data)) {
- case RC6_MODE_0:
- scancode = data->body & 0xffff;
- toggle = data->toggle;
- IR_dprintk(1, "RC6(0) scancode 0x%04x (toggle: %u)\n",
- scancode, toggle);
- break;
- case RC6_MODE_6A:
- if (data->wanted_bits == RC6_6A_LARGE_NBITS) {
- toggle = data->body & RC6_6A_MCE_TOGGLE_MASK ? 1 : 0;
- scancode = data->body & ~RC6_6A_MCE_TOGGLE_MASK;
- } else {
- toggle = 0;
- scancode = data->body & 0xffffff;
- }
-
- IR_dprintk(1, "RC6(6A) scancode 0x%08x (toggle: %u)\n",
- scancode, toggle);
- break;
- default:
- IR_dprintk(1, "RC6 unknown mode\n");
- goto out;
- }
-
- ir_keydown(input_dev, scancode, toggle);
- data->state = STATE_INACTIVE;
- return 0;
- }
-
-out:
- IR_dprintk(1, "RC6 decode failed at state %i (%uus %s)\n",
- data->state, TO_US(ev.duration), TO_STR(ev.pulse));
- data->state = STATE_INACTIVE;
- return -EINVAL;
-}
-
-static struct ir_raw_handler rc6_handler = {
- .protocols = IR_TYPE_RC6,
- .decode = ir_rc6_decode,
-};
-
-static int __init ir_rc6_decode_init(void)
-{
- ir_raw_handler_register(&rc6_handler);
-
- printk(KERN_INFO "IR RC6 protocol handler initialized\n");
- return 0;
-}
-
-static void __exit ir_rc6_decode_exit(void)
-{
- ir_raw_handler_unregister(&rc6_handler);
-}
-
-module_init(ir_rc6_decode_init);
-module_exit(ir_rc6_decode_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
-MODULE_DESCRIPTION("RC6 IR protocol decoder");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 01:37:45 +0000