1 files changed, 156 insertions, 49 deletions

diff --git a/drivers/media/rc/ir-rc6-decoder.c b/drivers/media/rc/ir-rc6-decoder.c
index 7cba7d33a3fa..3b2c8bab3e73 100644
--- a/drivers/media/rc/ir-rc6-decoder.c
+++ b/drivers/media/rc/ir-rc6-decoder.c
@@ -1,15 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* ir-rc6-decoder.c - A decoder for the RC6 IR 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 "rc-core-priv.h"
@@ -23,7 +15,7 @@
  * RC6-6A-32	(MCE version with toggle bit in body)
  */
 
-#define RC6_UNIT		444444	/* nanosecs */
+#define RC6_UNIT		444	/* microseconds */
 #define RC6_HEADER_NBITS	4	/* not including toggle bit */
 #define RC6_0_NBITS		16
 #define RC6_6A_32_NBITS		32
@@ -40,6 +32,8 @@
 #define RC6_6A_MCE_TOGGLE_MASK	0x8000	/* for the body bits */
 #define RC6_6A_LCC_MASK		0xffff0000 /* RC6-6A-32 long customer code mask */
 #define RC6_6A_MCE_CC		0x800f0000 /* MCE customer code */
+#define RC6_6A_ZOTAC_CC		0x80340000 /* Zotac customer code */
+#define RC6_6A_KATHREIN_CC	0x80460000 /* Kathrein RCU-676 customer code */
 #ifndef CHAR_BIT
 #define CHAR_BIT 8	/* Normally in <limits.h> */
 #endif
@@ -70,7 +64,7 @@ static enum rc6_mode rc6_mode(struct rc6_dec *data)
 	case 6:
 		if (!data->toggle)
 			return RC6_MODE_6A;
-		/* fall through */
+		fallthrough;
 	default:
 		return RC6_MODE_UNKNOWN;
 	}
@@ -88,14 +82,10 @@ static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
 	struct rc6_dec *data = &dev->raw->rc6;
 	u32 scancode;
 	u8 toggle;
-
-	if (!(dev->enabled_protocols &
-	      (RC_BIT_RC6_0 | RC_BIT_RC6_6A_20 | RC_BIT_RC6_6A_24 |
-	       RC_BIT_RC6_6A_32 | RC_BIT_RC6_MCE)))
-		return 0;
+	enum rc_proto protocol;
 
 	if (!is_timing_event(ev)) {
-		if (ev.reset)
+		if (ev.overflow)
 			data->state = STATE_INACTIVE;
 		return 0;
 	}
@@ -104,8 +94,8 @@ static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		goto out;
 
 again:
-	IR_dprintk(2, "RC6 decode started at state %i (%uus %s)\n",
-		   data->state, TO_US(ev.duration), TO_STR(ev.pulse));
+	dev_dbg(&dev->dev, "RC6 decode started at state %i (%uus %s)\n",
+		data->state, ev.duration, TO_STR(ev.pulse));
 
 	if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
 		return 0;
@@ -149,9 +139,6 @@ again:
 		return 0;
 
 	case STATE_HEADER_BIT_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev))
-			break;
-
 		if (data->count == RC6_HEADER_NBITS)
 			data->state = STATE_TOGGLE_START;
 		else
@@ -169,12 +156,8 @@ again:
 		return 0;
 
 	case STATE_TOGGLE_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev) ||
-		    !geq_margin(ev.duration, RC6_TOGGLE_END, RC6_UNIT / 2))
-			break;
-
 		if (!(data->header & RC6_STARTBIT_MASK)) {
-			IR_dprintk(1, "RC6 invalid start bit\n");
+			dev_dbg(&dev->dev, "RC6 invalid start bit\n");
 			break;
 		}
 
@@ -191,7 +174,7 @@ again:
 			data->wanted_bits = RC6_6A_NBITS;
 			break;
 		default:
-			IR_dprintk(1, "RC6 unknown mode\n");
+			dev_dbg(&dev->dev, "RC6 unknown mode\n");
 			goto out;
 		}
 		goto again;
@@ -214,9 +197,6 @@ again:
 		break;
 
 	case STATE_BODY_BIT_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev))
-			break;
-
 		if (data->count == data->wanted_bits)
 			data->state = STATE_FINISHED;
 		else
@@ -233,50 +213,177 @@ again:
 		case RC6_MODE_0:
 			scancode = data->body;
 			toggle = data->toggle;
-			IR_dprintk(1, "RC6(0) scancode 0x%04x (toggle: %u)\n",
-				   scancode, toggle);
+			protocol = RC_PROTO_RC6_0;
+			dev_dbg(&dev->dev, "RC6(0) scancode 0x%04x (toggle: %u)\n",
+				scancode, toggle);
 			break;
+
 		case RC6_MODE_6A:
 			if (data->count > CHAR_BIT * sizeof data->body) {
-				IR_dprintk(1, "RC6 too many (%u) data bits\n",
+				dev_dbg(&dev->dev, "RC6 too many (%u) data bits\n",
 					data->count);
 				goto out;
 			}
 
 			scancode = data->body;
-			if (data->count == RC6_6A_32_NBITS &&
-					(scancode & RC6_6A_LCC_MASK) == RC6_6A_MCE_CC) {
-				/* MCE RC */
-				toggle = (scancode & RC6_6A_MCE_TOGGLE_MASK) ? 1 : 0;
-				scancode &= ~RC6_6A_MCE_TOGGLE_MASK;
-			} else {
+			switch (data->count) {
+			case 20:
+				protocol = RC_PROTO_RC6_6A_20;
+				toggle = 0;
+				break;
+			case 24:
+				protocol = RC_PROTO_RC6_6A_24;
 				toggle = 0;
+				break;
+			case 32:
+				switch (scancode & RC6_6A_LCC_MASK) {
+				case RC6_6A_MCE_CC:
+				case RC6_6A_KATHREIN_CC:
+				case RC6_6A_ZOTAC_CC:
+					protocol = RC_PROTO_RC6_MCE;
+					toggle = !!(scancode & RC6_6A_MCE_TOGGLE_MASK);
+					scancode &= ~RC6_6A_MCE_TOGGLE_MASK;
+					break;
+				default:
+					protocol = RC_PROTO_RC6_6A_32;
+					toggle = 0;
+					break;
+				}
+				break;
+			default:
+				dev_dbg(&dev->dev, "RC6(6A) unsupported length\n");
+				goto out;
 			}
-			IR_dprintk(1, "RC6(6A) scancode 0x%08x (toggle: %u)\n",
-				   scancode, toggle);
+
+			dev_dbg(&dev->dev, "RC6(6A) proto 0x%04x, scancode 0x%08x (toggle: %u)\n",
+				protocol, scancode, toggle);
 			break;
 		default:
-			IR_dprintk(1, "RC6 unknown mode\n");
+			dev_dbg(&dev->dev, "RC6 unknown mode\n");
 			goto out;
 		}
 
-		rc_keydown(dev, scancode, toggle);
+		rc_keydown(dev, protocol, scancode, toggle);
 		data->state = STATE_INACTIVE;
 		return 0;
 	}
 
 out:
-	IR_dprintk(1, "RC6 decode failed at state %i (%uus %s)\n",
-		   data->state, TO_US(ev.duration), TO_STR(ev.pulse));
+	dev_dbg(&dev->dev, "RC6 decode failed at state %i (%uus %s)\n",
+		data->state, ev.duration, TO_STR(ev.pulse));
 	data->state = STATE_INACTIVE;
 	return -EINVAL;
 }
 
+static const struct ir_raw_timings_manchester ir_rc6_timings[4] = {
+	{
+		.leader_pulse		= RC6_PREFIX_PULSE,
+		.leader_space		= RC6_PREFIX_SPACE,
+		.clock			= RC6_UNIT,
+		.invert			= 1,
+	},
+	{
+		.clock			= RC6_UNIT * 2,
+		.invert			= 1,
+	},
+	{
+		.clock			= RC6_UNIT,
+		.invert			= 1,
+		.trailer_space		= RC6_SUFFIX_SPACE,
+	},
+};
+
+/**
+ * ir_rc6_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.
+ *		-EINVAL if the scancode is ambiguous or invalid.
+ */
+static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
+			 struct ir_raw_event *events, unsigned int max)
+{
+	int ret;
+	struct ir_raw_event *e = events;
+
+	if (protocol == RC_PROTO_RC6_0) {
+		/* Modulate the header (Start Bit & Mode-0) */
+		ret = ir_raw_gen_manchester(&e, max - (e - events),
+					    &ir_rc6_timings[0],
+					    RC6_HEADER_NBITS, (1 << 3));
+		if (ret < 0)
+			return ret;
+
+		/* Modulate Trailer Bit */
+		ret = ir_raw_gen_manchester(&e, max - (e - events),
+					    &ir_rc6_timings[1], 1, 0);
+		if (ret < 0)
+			return ret;
+
+		/* Modulate rest of the data */
+		ret = ir_raw_gen_manchester(&e, max - (e - events),
+					    &ir_rc6_timings[2], RC6_0_NBITS,
+					    scancode);
+		if (ret < 0)
+			return ret;
+
+	} else {
+		int bits;
+
+		switch (protocol) {
+		case RC_PROTO_RC6_MCE:
+		case RC_PROTO_RC6_6A_32:
+			bits = 32;
+			break;
+		case RC_PROTO_RC6_6A_24:
+			bits = 24;
+			break;
+		case RC_PROTO_RC6_6A_20:
+			bits = 20;
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		/* Modulate the header (Start Bit & Header-version 6 */
+		ret = ir_raw_gen_manchester(&e, max - (e - events),
+					    &ir_rc6_timings[0],
+					    RC6_HEADER_NBITS, (1 << 3 | 6));
+		if (ret < 0)
+			return ret;
+
+		/* Modulate Trailer Bit */
+		ret = ir_raw_gen_manchester(&e, max - (e - events),
+					    &ir_rc6_timings[1], 1, 0);
+		if (ret < 0)
+			return ret;
+
+		/* Modulate rest of the data */
+		ret = ir_raw_gen_manchester(&e, max - (e - events),
+					    &ir_rc6_timings[2],
+					    bits,
+					    scancode);
+		if (ret < 0)
+			return ret;
+	}
+
+	return e - events;
+}
+
 static struct ir_raw_handler rc6_handler = {
-	.protocols	= RC_BIT_RC6_0 | RC_BIT_RC6_6A_20 |
-			  RC_BIT_RC6_6A_24 | RC_BIT_RC6_6A_32 |
-			  RC_BIT_RC6_MCE,
+	.protocols	= RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 |
+			  RC_PROTO_BIT_RC6_6A_24 | RC_PROTO_BIT_RC6_6A_32 |
+			  RC_PROTO_BIT_RC6_MCE,
 	.decode		= ir_rc6_decode,
+	.encode		= ir_rc6_encode,
+	.carrier	= 36000,
+	.min_timeout	= RC6_SUFFIX_SPACE,
 };
 
 static int __init ir_rc6_decode_init(void)