1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/media/rc/ir-sony-decoder.c b/drivers/media/rc/ir-sony-decoder.c
new file mode 100644
index 000000000..5065c0812
--- /dev/null
+++ b/drivers/media/rc/ir-sony-decoder.c
@@ -0,0 +1,248 @@
+/* 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 <linux/module.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;
+	enum rc_proto protocol;
+	u32 scancode;
+	u8 device, subdevice, function;
+
+	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;
+
+	dev_dbg(&dev->dev, "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:
+			if (!(dev->enabled_protocols & RC_PROTO_BIT_SONY12))
+				goto finish_state_machine;
+
+			device    = bitrev8((data->bits <<  3) & 0xF8);
+			subdevice = 0;
+			function  = bitrev8((data->bits >>  4) & 0xFE);
+			protocol = RC_PROTO_SONY12;
+			break;
+		case 15:
+			if (!(dev->enabled_protocols & RC_PROTO_BIT_SONY15))
+				goto finish_state_machine;
+
+			device    = bitrev8((data->bits >>  0) & 0xFF);
+			subdevice = 0;
+			function  = bitrev8((data->bits >>  7) & 0xFE);
+			protocol = RC_PROTO_SONY15;
+			break;
+		case 20:
+			if (!(dev->enabled_protocols & RC_PROTO_BIT_SONY20))
+				goto finish_state_machine;
+
+			device    = bitrev8((data->bits >>  5) & 0xF8);
+			subdevice = bitrev8((data->bits >>  0) & 0xFF);
+			function  = bitrev8((data->bits >> 12) & 0xFE);
+			protocol = RC_PROTO_SONY20;
+			break;
+		default:
+			dev_dbg(&dev->dev, "Sony invalid bitcount %u\n",
+				data->count);
+			goto out;
+		}
+
+		scancode = device << 16 | subdevice << 8 | function;
+		dev_dbg(&dev->dev, "Sony(%u) scancode 0x%05x\n", data->count,
+			scancode);
+		rc_keydown(dev, protocol, scancode, 0);
+		goto finish_state_machine;
+	}
+
+out:
+	dev_dbg(&dev->dev, "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;
+
+finish_state_machine:
+	data->state = STATE_INACTIVE;
+	return 0;
+}
+
+static const struct ir_raw_timings_pl ir_sony_timings = {
+	.header_pulse  = SONY_HEADER_PULSE,
+	.bit_space     = SONY_BIT_SPACE,
+	.bit_pulse[0]  = SONY_BIT_0_PULSE,
+	.bit_pulse[1]  = SONY_BIT_1_PULSE,
+	.trailer_space = SONY_TRAILER_SPACE + SONY_BIT_SPACE,
+	.msb_first     = 0,
+};
+
+/**
+ * ir_sony_encode() - Encode a scancode as a stream of raw events
+ *
+ * @protocol:	protocol to encode
+ * @scancode:	scancode to encode
+ * @events:	array of raw ir events to write into
+ * @max:	maximum size of @events
+ *
+ * Returns:	The number of events written.
+ *		-ENOBUFS if there isn't enough space in the array to fit the
+ *		encoding. In this case all @max events will have been written.
+ */
+static int ir_sony_encode(enum rc_proto protocol, u32 scancode,
+			  struct ir_raw_event *events, unsigned int max)
+{
+	struct ir_raw_event *e = events;
+	u32 raw, len;
+	int ret;
+
+	if (protocol == RC_PROTO_SONY12) {
+		raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9);
+		len = 12;
+	} else if (protocol == RC_PROTO_SONY15) {
+		raw = (scancode & 0x7f) | ((scancode & 0xff0000) >> 9);
+		len = 15;
+	} else {
+		raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9) |
+		       ((scancode & 0xff00) << 4);
+		len = 20;
+	}
+
+	ret = ir_raw_gen_pl(&e, max, &ir_sony_timings, len, raw);
+	if (ret < 0)
+		return ret;
+
+	return e - events;
+}
+
+static struct ir_raw_handler sony_handler = {
+	.protocols	= RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 |
+							RC_PROTO_BIT_SONY20,
+	.decode		= ir_sony_decode,
+	.encode		= ir_sony_encode,
+	.carrier	= 40000,
+	.min_timeout	= SONY_TRAILER_SPACE,
+};
+
+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");