1 /* ir-rc6-decoder.c - A decoder for the RC6 IR protocol
15 #include "rc-core-priv.h"
20  * RC6-0-16	(standard toggle bit in header)
21  * RC6-6A-20	(no toggle bit)
22  * RC6-6A-24	(no toggle bit)
23  * RC6-6A-32	(MCE version with toggle bit in body)
41 #define RC6_6A_LCC_MASK		0xffff0000 /* RC6-6A-32 long customer code mask */
42 #define RC6_6A_MCE_CC		0x800f0000 /* MCE customer code */
43 #define RC6_6A_KATHREIN_CC	0x80460000 /* Kathrein RCU-676 customer code */
68 	switch (data->header & RC6_MODE_MASK) {  in rc6_mode()
72 		if (!data->toggle)  in rc6_mode()
81  * ir_rc6_decode() - Decode one RC6 pulse or space
85  * This function returns -EINVAL if the pulse violates the state machine
89 	struct rc6_dec *data = &dev->raw->rc6;  in ir_rc6_decode()
96 			data->state = STATE_INACTIVE;  in ir_rc6_decode()
104 	dev_dbg(&dev->dev, "RC6 decode started at state %i (%uus %s)\n",  in ir_rc6_decode()
105 		data->state, TO_US(ev.duration), TO_STR(ev.pulse));  in ir_rc6_decode()
110 	switch (data->state) {  in ir_rc6_decode()
122 		data->state = STATE_PREFIX_SPACE;  in ir_rc6_decode()
123 		data->count = 0;  in ir_rc6_decode()
133 		data->state = STATE_HEADER_BIT_START;  in ir_rc6_decode()
134 		data->header = 0;  in ir_rc6_decode()
141 		data->header <<= 1;  in ir_rc6_decode()
143 			data->header |= 1;  in ir_rc6_decode()
144 		data->count++;  in ir_rc6_decode()
145 		data->state = STATE_HEADER_BIT_END;  in ir_rc6_decode()
149 		if (data->count == RC6_HEADER_NBITS)  in ir_rc6_decode()
150 			data->state = STATE_TOGGLE_START;  in ir_rc6_decode()
152 			data->state = STATE_HEADER_BIT_START;  in ir_rc6_decode()
161 		data->toggle = ev.pulse;  in ir_rc6_decode()
162 		data->state = STATE_TOGGLE_END;  in ir_rc6_decode()
166 		if (!(data->header & RC6_STARTBIT_MASK)) {  in ir_rc6_decode()
167 			dev_dbg(&dev->dev, "RC6 invalid start bit\n");  in ir_rc6_decode()
171 		data->state = STATE_BODY_BIT_START;  in ir_rc6_decode()
173 		data->count = 0;  in ir_rc6_decode()
174 		data->body = 0;  in ir_rc6_decode()
178 			data->wanted_bits = RC6_0_NBITS;  in ir_rc6_decode()
181 			data->wanted_bits = RC6_6A_NBITS;  in ir_rc6_decode()
184 			dev_dbg(&dev->dev, "RC6 unknown mode\n");  in ir_rc6_decode()
191 			/* Discard LSB's that won't fit in data->body */  in ir_rc6_decode()
192 			if (data->count++ < CHAR_BIT * sizeof data->body) {  in ir_rc6_decode()
193 				data->body <<= 1;  in ir_rc6_decode()
195 					data->body |= 1;  in ir_rc6_decode()
197 			data->state = STATE_BODY_BIT_END;  in ir_rc6_decode()
201 			data->state = STATE_FINISHED;  in ir_rc6_decode()
207 		if (data->count == data->wanted_bits)  in ir_rc6_decode()
208 			data->state = STATE_FINISHED;  in ir_rc6_decode()
210 			data->state = STATE_BODY_BIT_START;  in ir_rc6_decode()
221 			scancode = data->body;  in ir_rc6_decode()
222 			toggle = data->toggle;  in ir_rc6_decode()
224 			dev_dbg(&dev->dev, "RC6(0) scancode 0x%04x (toggle: %u)\n",  in ir_rc6_decode()
229 			if (data->count > CHAR_BIT * sizeof data->body) {  in ir_rc6_decode()
230 				dev_dbg(&dev->dev, "RC6 too many (%u) data bits\n",  in ir_rc6_decode()
231 					data->count);  in ir_rc6_decode()
235 			scancode = data->body;  in ir_rc6_decode()
236 			switch (data->count) {  in ir_rc6_decode()
260 				dev_dbg(&dev->dev, "RC6(6A) unsupported length\n");  in ir_rc6_decode()
264 			dev_dbg(&dev->dev, "RC6(6A) proto 0x%04x, scancode 0x%08x (toggle: %u)\n",  in ir_rc6_decode()
268 			dev_dbg(&dev->dev, "RC6 unknown mode\n");  in ir_rc6_decode()
273 		data->state = STATE_INACTIVE;  in ir_rc6_decode()
278 	dev_dbg(&dev->dev, "RC6 decode failed at state %i (%uus %s)\n",  in ir_rc6_decode()
279 		data->state, TO_US(ev.duration), TO_STR(ev.pulse));  in ir_rc6_decode()
280 	data->state = STATE_INACTIVE;  in ir_rc6_decode()
281 	return -EINVAL;  in ir_rc6_decode()
303  * ir_rc6_encode() - Encode a scancode as a stream of raw events
311  *		-ENOBUFS if there isn't enough space in the array to fit the
313  *		-EINVAL if the scancode is ambiguous or invalid.
322 		/* Modulate the header (Start Bit & Mode-0) */  in ir_rc6_encode()
323 		ret = ir_raw_gen_manchester(&e, max - (e - events),  in ir_rc6_encode()
330 		ret = ir_raw_gen_manchester(&e, max - (e - events),  in ir_rc6_encode()
336 		ret = ir_raw_gen_manchester(&e, max - (e - events),  in ir_rc6_encode()
357 			return -EINVAL;  in ir_rc6_encode()
360 		/* Modulate the header (Start Bit & Header-version 6 */  in ir_rc6_encode()
361 		ret = ir_raw_gen_manchester(&e, max - (e - events),  in ir_rc6_encode()
368 		ret = ir_raw_gen_manchester(&e, max - (e - events),  in ir_rc6_encode()
374 		ret = ir_raw_gen_manchester(&e, max - (e - events),  in ir_rc6_encode()
382 	return e - events;  in ir_rc6_encode()
399 	printk(KERN_INFO "IR RC6 protocol handler initialized\n");  in ir_rc6_decode_init()
413 MODULE_DESCRIPTION("RC6 IR protocol decoder");