1 // SPDX-License-Identifier: GPL-2.0+
2 // ir-rcmm-decoder.c - A decoder for the RCMM IR protocol
6 #include "rc-core-priv.h"
24 static bool rcmm_mode(const struct rcmm_dec *data)  in rcmm_mode()  argument
26 	return !((0x000c0000 & data->bits) == 0x000c0000);  in rcmm_mode()
29 static int rcmm_miscmode(struct rc_dev *dev, struct rcmm_dec *data)  in rcmm_miscmode()  argument
31 	switch (data->count) {  in rcmm_miscmode()
33 		if (dev->enabled_protocols & RC_PROTO_BIT_RCMM24) {  in rcmm_miscmode()
34 			rc_keydown(dev, RC_PROTO_RCMM24, data->bits, 0);  in rcmm_miscmode()
35 			data->state = STATE_INACTIVE;  in rcmm_miscmode()
38 		return -1;  in rcmm_miscmode()
41 		if (dev->enabled_protocols & RC_PROTO_BIT_RCMM12) {  in rcmm_miscmode()
42 			rc_keydown(dev, RC_PROTO_RCMM12, data->bits, 0);  in rcmm_miscmode()
43 			data->state = STATE_INACTIVE;  in rcmm_miscmode()
46 		return -1;  in rcmm_miscmode()
49 	return -1;  in rcmm_miscmode()
53  * ir_rcmm_decode() - Decode one RCMM pulse or space
57  * This function returns -EINVAL if the pulse violates the state machine
61 	struct rcmm_dec *data = &dev->raw->rcmm;  in ir_rcmm_decode()  local
66 	if (!(dev->enabled_protocols & (RC_PROTO_BIT_RCMM32 |  in ir_rcmm_decode()
73 			data->state = STATE_INACTIVE;  in ir_rcmm_decode()
77 	switch (data->state) {  in ir_rcmm_decode()
85 		data->state = STATE_LOW;  in ir_rcmm_decode()
86 		data->count = 0;  in ir_rcmm_decode()
87 		data->bits  = 0;  in ir_rcmm_decode()
97 		data->state = STATE_BUMP;  in ir_rcmm_decode()
107 		data->state = STATE_VALUE;  in ir_rcmm_decode()
123 			value = -1;  in ir_rcmm_decode()
125 		if (value == -1) {  in ir_rcmm_decode()
126 			if (!rcmm_miscmode(dev, data))  in ir_rcmm_decode()
131 		data->bits <<= 2;  in ir_rcmm_decode()
132 		data->bits |= value;  in ir_rcmm_decode()
134 		data->count += 2;  in ir_rcmm_decode()
136 		if (data->count < 32)  in ir_rcmm_decode()
137 			data->state = STATE_BUMP;  in ir_rcmm_decode()
139 			data->state = STATE_FINISHED;  in ir_rcmm_decode()
150 		if (rcmm_mode(data)) {  in ir_rcmm_decode()
151 			toggle = !!(0x8000 & data->bits);  in ir_rcmm_decode()
152 			scancode = data->bits & ~0x8000;  in ir_rcmm_decode()
155 			scancode = data->bits;  in ir_rcmm_decode()
158 		if (dev->enabled_protocols & RC_PROTO_BIT_RCMM32) {  in ir_rcmm_decode()
160 			data->state = STATE_INACTIVE;  in ir_rcmm_decode()
167 	dev_dbg(&dev->dev, "RC-MM decode failed at count %d state %d (%uus %s)\n",  in ir_rcmm_decode()
168 		data->count, data->state, ev.duration, TO_STR(ev.pulse));  in ir_rcmm_decode()
169 	data->state = STATE_INACTIVE;  in ir_rcmm_decode()
170 	return -EINVAL;  in ir_rcmm_decode()
181 			      unsigned int n, u32 data)  in ir_rcmm_rawencoder()  argument
190 	for (i = n - 2; i >= 0; i -= 2) {  in ir_rcmm_rawencoder()
191 		const unsigned int space = rcmmspace[(data >> i) & 3];  in ir_rcmm_rawencoder()
218 		ret = -EINVAL;  in ir_rcmm_encode()
224 	return e - events;  in ir_rcmm_encode()