[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / rc / ir-sony-decoder.c

/* ir-sony-decoder.c - handle Sony IR Pulse/Space 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 <linux/bitrev.h>
#include "rc-core-priv.h"

#define SONY_UNIT		600000 /* ns */
#define SONY_HEADER_PULSE	(4 * SONY_UNIT)
#define	SONY_HEADER_SPACE	(1 * SONY_UNIT)
#define SONY_BIT_0_PULSE	(1 * SONY_UNIT)
#define SONY_BIT_1_PULSE	(2 * SONY_UNIT)
#define SONY_BIT_SPACE		(1 * SONY_UNIT)
#define SONY_TRAILER_SPACE	(10 * SONY_UNIT) /* minimum */

enum sony_state {
	STATE_INACTIVE,
	STATE_HEADER_SPACE,
	STATE_BIT_PULSE,
	STATE_BIT_SPACE,
	STATE_FINISHED,
};

/**
 * ir_sony_decode() - Decode one Sony pulse or space
 * @dev:	the struct rc_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_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
{
	struct sony_dec *data = &dev->raw->sony;
	u32 scancode;
	u8 device, subdevice, function;

	if (!(dev->raw->enabled_protocols & RC_TYPE_SONY))
		return 0;

	if (!is_timing_event(ev)) {
		if (ev.reset)
			data->state = STATE_INACTIVE;
		return 0;
	}

	if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2))
		goto out;

	IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n",
		   data->state, TO_US(ev.duration), TO_STR(ev.pulse));

	switch (data->state) {

	case STATE_INACTIVE:
		if (!ev.pulse)
			break;

		if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2))
			break;

		data->count = 0;
		data->state = STATE_HEADER_SPACE;
		return 0;

	case STATE_HEADER_SPACE:
		if (ev.pulse)
			break;

		if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2))
			break;

		data->state = STATE_BIT_PULSE;
		return 0;

	case STATE_BIT_PULSE:
		if (!ev.pulse)
			break;

		data->bits <<= 1;
		if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
			data->bits |= 1;
		else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2))
			break;

		data->count++;
		data->state = STATE_BIT_SPACE;
		return 0;

	case STATE_BIT_SPACE:
		if (ev.pulse)
			break;

		if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2))
			break;

		decrease_duration(&ev, SONY_BIT_SPACE);

		if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) {
			data->state = STATE_BIT_PULSE;
			return 0;
		}

		data->state = STATE_FINISHED;
		/* Fall through */

	case STATE_FINISHED:
		if (ev.pulse)
			break;

		if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2))
			break;

		switch (data->count) {
		case 12:
			device    = bitrev8((data->bits <<  3) & 0xF8);
			subdevice = 0;
			function  = bitrev8((data->bits >>  4) & 0xFE);
			break;
		case 15:
			device    = bitrev8((data->bits >>  0) & 0xFF);
			subdevice = 0;
			function  = bitrev8((data->bits >>  7) & 0xFD);
			break;
		case 20:
			device    = bitrev8((data->bits >>  5) & 0xF8);
			subdevice = bitrev8((data->bits >>  0) & 0xFF);
			function  = bitrev8((data->bits >> 12) & 0xFE);
			break;
		default:
			IR_dprintk(1, "Sony invalid bitcount %u\n", data->count);
			goto out;
		}

		scancode = device << 16 | subdevice << 8 | function;
		IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode);
		rc_keydown(dev, scancode, 0);
		data->state = STATE_INACTIVE;
		return 0;
	}

out:
	IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n",
		   data->state, TO_US(ev.duration), TO_STR(ev.pulse));
	data->state = STATE_INACTIVE;
	return -EINVAL;
}

static struct ir_raw_handler sony_handler = {
	.protocols	= RC_TYPE_SONY,
	.decode		= ir_sony_decode,
};

static int __init ir_sony_decode_init(void)
{
	ir_raw_handler_register(&sony_handler);

	printk(KERN_INFO "IR Sony protocol handler initialized\n");
	return 0;
}

static void __exit ir_sony_decode_exit(void)
{
	ir_raw_handler_unregister(&sony_handler);
}

module_init(ir_sony_decode_init);
module_exit(ir_sony_decode_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
MODULE_DESCRIPTION("Sony IR protocol decoder");
Commit	Line	Data
3fe29c89 DH	1	/* ir-sony-decoder.c - handle Sony IR Pulse/Space protocol
	2	*
	3	* Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation version 2 of the License.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*/
	14
	15	#include <linux/bitrev.h>
f62de675	16	#include "rc-core-priv.h"
3fe29c89 DH	17
	18	#define SONY_UNIT 600000 /* ns */
	19	#define SONY_HEADER_PULSE (4 * SONY_UNIT)
	20	#define SONY_HEADER_SPACE (1 * SONY_UNIT)
	21	#define SONY_BIT_0_PULSE (1 * SONY_UNIT)
	22	#define SONY_BIT_1_PULSE (2 * SONY_UNIT)
	23	#define SONY_BIT_SPACE (1 * SONY_UNIT)
	24	#define SONY_TRAILER_SPACE (10 * SONY_UNIT) /* minimum */
	25
3fe29c89 DH	26	enum sony_state {
	27	STATE_INACTIVE,
	28	STATE_HEADER_SPACE,
	29	STATE_BIT_PULSE,
	30	STATE_BIT_SPACE,
	31	STATE_FINISHED,
	32	};
	33
3fe29c89 DH	34	/**
3fe29c89 DH	35	* ir_sony_decode() - Decode one Sony pulse or space
d8b4b582	36	* @dev: the struct rc_dev descriptor of the device
3fe29c89 DH	37	* @ev: the struct ir_raw_event descriptor of the pulse/space
	38	*
	39	* This function returns -EINVAL if the pulse violates the state machine
	40	*/
d8b4b582	41	static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
3fe29c89	42	{
d8b4b582	43	struct sony_dec *data = &dev->raw->sony;
3fe29c89 DH	44	u32 scancode;
	45	u8 device, subdevice, function;
	46
52b66144	47	if (!(dev->raw->enabled_protocols & RC_TYPE_SONY))
3fe29c89 DH	48	return 0;
3fe29c89 DH	49
4651918a ML	50	if (!is_timing_event(ev)) {
	51	if (ev.reset)
	52	data->state = STATE_INACTIVE;
3fe29c89 DH	53	return 0;
	54	}
	55
	56	if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2))
	57	goto out;
	58
	59	IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n",
	60	data->state, TO_US(ev.duration), TO_STR(ev.pulse));
	61
	62	switch (data->state) {
	63
	64	case STATE_INACTIVE:
	65	if (!ev.pulse)
	66	break;
	67
	68	if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2))
	69	break;
	70
	71	data->count = 0;
	72	data->state = STATE_HEADER_SPACE;
	73	return 0;
	74
	75	case STATE_HEADER_SPACE:
	76	if (ev.pulse)
	77	break;
	78
	79	if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2))
	80	break;
	81
	82	data->state = STATE_BIT_PULSE;
	83	return 0;
	84
	85	case STATE_BIT_PULSE:
	86	if (!ev.pulse)
	87	break;
	88
c216369e	89	data->bits <<= 1;
3fe29c89	90	if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
c216369e	91	data->bits \|= 1;
3fe29c89 DH	92	else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2))
	93	break;
	94
	95	data->count++;
	96	data->state = STATE_BIT_SPACE;
	97	return 0;
	98
	99	case STATE_BIT_SPACE:
	100	if (ev.pulse)
	101	break;
	102
	103	if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2))
	104	break;
	105
	106	decrease_duration(&ev, SONY_BIT_SPACE);
	107
	108	if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) {
	109	data->state = STATE_BIT_PULSE;
	110	return 0;
	111	}
	112
	113	data->state = STATE_FINISHED;
	114	/* Fall through */
	115
	116	case STATE_FINISHED:
	117	if (ev.pulse)
	118	break;
	119
	120	if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2))
	121	break;
	122
	123	switch (data->count) {
	124	case 12:
c216369e	125	device = bitrev8((data->bits << 3) & 0xF8);
3fe29c89	126	subdevice = 0;
c216369e	127	function = bitrev8((data->bits >> 4) & 0xFE);
3fe29c89 DH	128	break;
3fe29c89 DH	129	case 15:
c216369e	130	device = bitrev8((data->bits >> 0) & 0xFF);
3fe29c89	131	subdevice = 0;
c216369e	132	function = bitrev8((data->bits >> 7) & 0xFD);
3fe29c89 DH	133	break;
3fe29c89 DH	134	case 20:
c216369e DH	135	device = bitrev8((data->bits >> 5) & 0xF8);
	136	subdevice = bitrev8((data->bits >> 0) & 0xFF);
	137	function = bitrev8((data->bits >> 12) & 0xFE);
3fe29c89 DH	138	break;
	139	default:
	140	IR_dprintk(1, "Sony invalid bitcount %u\n", data->count);
	141	goto out;
	142	}
	143
	144	scancode = device << 16 \| subdevice << 8 \| function;
	145	IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode);
ca86674b	146	rc_keydown(dev, scancode, 0);
3fe29c89 DH	147	data->state = STATE_INACTIVE;
	148	return 0;
	149	}
	150
	151	out:
	152	IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n",
	153	data->state, TO_US(ev.duration), TO_STR(ev.pulse));
	154	data->state = STATE_INACTIVE;
	155	return -EINVAL;
	156	}
	157
3fe29c89	158	static struct ir_raw_handler sony_handler = {
52b66144	159	.protocols = RC_TYPE_SONY,
3fe29c89	160	.decode = ir_sony_decode,
3fe29c89 DH	161	};
	162
	163	static int __init ir_sony_decode_init(void)
	164	{
	165	ir_raw_handler_register(&sony_handler);
	166
	167	printk(KERN_INFO "IR Sony protocol handler initialized\n");
	168	return 0;
	169	}
	170
	171	static void __exit ir_sony_decode_exit(void)
	172	{
	173	ir_raw_handler_unregister(&sony_handler);
	174	}
	175
	176	module_init(ir_sony_decode_init);
	177	module_exit(ir_sony_decode_exit);
	178
	179	MODULE_LICENSE("GPL");
	180	MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
	181	MODULE_DESCRIPTION("Sony IR protocol decoder");