1 // SPDX-License-Identifier: GPL-2.0-only
2 /* ir-sharp-decoder.c - handle Sharp IR Pulse/Space protocol
4  * Copyright (C) 2013-2014 Imagination Technologies Ltd.
12 #include "rc-core-priv.h"
32  * ir_sharp_decode() - Decode one Sharp pulse or space
36  * This function returns -EINVAL if the pulse violates the state machine
40 	struct sharp_dec *data = &dev->raw->sharp;  in ir_sharp_decode()
45 			data->state = STATE_INACTIVE;  in ir_sharp_decode()
49 	dev_dbg(&dev->dev, "Sharp decode started at state %d (%uus %s)\n",  in ir_sharp_decode()
50 		data->state, ev.duration, TO_STR(ev.pulse));  in ir_sharp_decode()
52 	switch (data->state) {  in ir_sharp_decode()
62 		data->count = 0;  in ir_sharp_decode()
63 		data->pulse_len = ev.duration;  in ir_sharp_decode()
64 		data->state = STATE_BIT_SPACE;  in ir_sharp_decode()
75 		data->pulse_len = ev.duration;  in ir_sharp_decode()
76 		data->state = STATE_BIT_SPACE;  in ir_sharp_decode()
83 		data->bits <<= 1;  in ir_sharp_decode()
84 		if (eq_margin(data->pulse_len + ev.duration, SHARP_BIT_1_PERIOD,  in ir_sharp_decode()
86 			data->bits |= 1;  in ir_sharp_decode()
87 		else if (!eq_margin(data->pulse_len + ev.duration,  in ir_sharp_decode()
90 		data->count++;  in ir_sharp_decode()
92 		if (data->count == SHARP_NBITS ||  in ir_sharp_decode()
93 		    data->count == SHARP_NBITS * 2)  in ir_sharp_decode()
94 			data->state = STATE_TRAILER_PULSE;  in ir_sharp_decode()
96 			data->state = STATE_BIT_PULSE;  in ir_sharp_decode()
108 		if (data->count == SHARP_NBITS) {  in ir_sharp_decode()
110 			if ((data->bits & 0x3) != 0x2 &&  in ir_sharp_decode()
112 			    (data->bits & 0x3) != 0x0)  in ir_sharp_decode()
114 			data->state = STATE_ECHO_SPACE;  in ir_sharp_decode()
116 			data->state = STATE_TRAILER_SPACE;  in ir_sharp_decode()
128 		data->state = STATE_BIT_PULSE;  in ir_sharp_decode()
140 		/* Validate - command, ext, chk should be inverted in 2nd */  in ir_sharp_decode()
141 		msg = (data->bits >> 15) & 0x7fff;  in ir_sharp_decode()
142 		echo = data->bits & 0x7fff;  in ir_sharp_decode()
144 			dev_dbg(&dev->dev,  in ir_sharp_decode()
154 		dev_dbg(&dev->dev, "Sharp scancode 0x%04x\n", scancode);  in ir_sharp_decode()
157 		data->state = STATE_INACTIVE;  in ir_sharp_decode()
161 	dev_dbg(&dev->dev, "Sharp decode failed at count %d state %d (%uus %s)\n",  in ir_sharp_decode()
162 		data->count, data->state, ev.duration, TO_STR(ev.pulse));  in ir_sharp_decode()
163 	data->state = STATE_INACTIVE;  in ir_sharp_decode()
164 	return -EINVAL;  in ir_sharp_decode()
179  * ir_sharp_encode() - Encode a scancode as a stream of raw events
181  * @protocol:	protocol to encode
182  * @scancode:	scancode to encode
187  *		-ENOBUFS if there isn't enough space in the array to fit the
204 	max -= ret;  in ir_sharp_encode()
213 	return e - events;  in ir_sharp_encode()
219 	.encode		= ir_sharp_encode,