media: lirc: implement scancode sending

This introduces a new lirc mode: scancode. Any device which can send raw IR
can now also send scancodes.

int main()
{
	int mode, fd = open("/dev/lirc0", O_RDWR);

        mode = LIRC_MODE_SCANCODE;
	if (ioctl(fd, LIRC_SET_SEND_MODE, &mode)) {
		// kernel too old or lirc does not support transmit
	}
	struct lirc_scancode scancode = {
		.scancode = 0x1e3d,
		.rc_proto = RC_PROTO_RC5,
	};
	write(fd, &scancode, sizeof(scancode));
	close(fd);
}

The other fields of lirc_scancode must be set to 0.

Note that toggle (rc5, rc6) and repeats (nec) are not implemented. Nor is
there a method for holding down a key for a period.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/include/uapi/linux/lirc.h b/include/uapi/linux/lirc.h
index c3aef4316fbf..4fe580d36e41 100644
--- a/include/uapi/linux/lirc.h
+++ b/include/uapi/linux/lirc.h
@@ -47,12 +47,14 @@
 #define LIRC_MODE_RAW                  0x00000001
 #define LIRC_MODE_PULSE                0x00000002
 #define LIRC_MODE_MODE2                0x00000004
+#define LIRC_MODE_SCANCODE             0x00000008
 #define LIRC_MODE_LIRCCODE             0x00000010
 
 
 #define LIRC_CAN_SEND_RAW              LIRC_MODE2SEND(LIRC_MODE_RAW)
 #define LIRC_CAN_SEND_PULSE            LIRC_MODE2SEND(LIRC_MODE_PULSE)
 #define LIRC_CAN_SEND_MODE2            LIRC_MODE2SEND(LIRC_MODE_MODE2)
+#define LIRC_CAN_SEND_SCANCODE         LIRC_MODE2SEND(LIRC_MODE_SCANCODE)
 #define LIRC_CAN_SEND_LIRCCODE         LIRC_MODE2SEND(LIRC_MODE_LIRCCODE)
 
 #define LIRC_CAN_SEND_MASK             0x0000003f
@@ -64,6 +66,7 @@
 #define LIRC_CAN_REC_RAW               LIRC_MODE2REC(LIRC_MODE_RAW)
 #define LIRC_CAN_REC_PULSE             LIRC_MODE2REC(LIRC_MODE_PULSE)
 #define LIRC_CAN_REC_MODE2             LIRC_MODE2REC(LIRC_MODE_MODE2)
+#define LIRC_CAN_REC_SCANCODE          LIRC_MODE2REC(LIRC_MODE_SCANCODE)
 #define LIRC_CAN_REC_LIRCCODE          LIRC_MODE2REC(LIRC_MODE_LIRCCODE)
 
 #define LIRC_CAN_REC_MASK              LIRC_MODE2REC(LIRC_CAN_SEND_MASK)
@@ -131,4 +134,83 @@
 
 #define LIRC_SET_WIDEBAND_RECEIVER     _IOW('i', 0x00000023, __u32)
 
+/*
+ * struct lirc_scancode - decoded scancode with protocol for use with
+ *	LIRC_MODE_SCANCODE
+ *
+ * @timestamp: Timestamp in nanoseconds using CLOCK_MONOTONIC when IR
+ *	was decoded.
+ * @flags: should be 0 for transmit. When receiving scancodes,
+ *	LIRC_SCANCODE_FLAG_TOGGLE or LIRC_SCANCODE_FLAG_REPEAT can be set
+ *	depending on the protocol
+ * @rc_proto: see enum rc_proto
+ * @keycode: the translated keycode. Set to 0 for transmit.
+ * @scancode: the scancode received or to be sent
+ */
+struct lirc_scancode {
+	__u64	timestamp;
+	__u16	flags;
+	__u16	rc_proto;
+	__u32	keycode;
+	__u64	scancode;
+};
+
+/* Set if the toggle bit of rc-5 or rc-6 is enabled */
+#define LIRC_SCANCODE_FLAG_TOGGLE	1
+/* Set if this is a nec or sanyo repeat */
+#define LIRC_SCANCODE_FLAG_REPEAT	2
+
+/**
+ * enum rc_proto - the Remote Controller protocol
+ *
+ * @RC_PROTO_UNKNOWN: Protocol not known
+ * @RC_PROTO_OTHER: Protocol known but proprietary
+ * @RC_PROTO_RC5: Philips RC5 protocol
+ * @RC_PROTO_RC5X_20: Philips RC5x 20 bit protocol
+ * @RC_PROTO_RC5_SZ: StreamZap variant of RC5
+ * @RC_PROTO_JVC: JVC protocol
+ * @RC_PROTO_SONY12: Sony 12 bit protocol
+ * @RC_PROTO_SONY15: Sony 15 bit protocol
+ * @RC_PROTO_SONY20: Sony 20 bit protocol
+ * @RC_PROTO_NEC: NEC protocol
+ * @RC_PROTO_NECX: Extended NEC protocol
+ * @RC_PROTO_NEC32: NEC 32 bit protocol
+ * @RC_PROTO_SANYO: Sanyo protocol
+ * @RC_PROTO_MCIR2_KBD: RC6-ish MCE keyboard
+ * @RC_PROTO_MCIR2_MSE: RC6-ish MCE mouse
+ * @RC_PROTO_RC6_0: Philips RC6-0-16 protocol
+ * @RC_PROTO_RC6_6A_20: Philips RC6-6A-20 protocol
+ * @RC_PROTO_RC6_6A_24: Philips RC6-6A-24 protocol
+ * @RC_PROTO_RC6_6A_32: Philips RC6-6A-32 protocol
+ * @RC_PROTO_RC6_MCE: MCE (Philips RC6-6A-32 subtype) protocol
+ * @RC_PROTO_SHARP: Sharp protocol
+ * @RC_PROTO_XMP: XMP protocol
+ * @RC_PROTO_CEC: CEC protocol
+ */
+enum rc_proto {
+	RC_PROTO_UNKNOWN	= 0,
+	RC_PROTO_OTHER		= 1,
+	RC_PROTO_RC5		= 2,
+	RC_PROTO_RC5X_20	= 3,
+	RC_PROTO_RC5_SZ		= 4,
+	RC_PROTO_JVC		= 5,
+	RC_PROTO_SONY12		= 6,
+	RC_PROTO_SONY15		= 7,
+	RC_PROTO_SONY20		= 8,
+	RC_PROTO_NEC		= 9,
+	RC_PROTO_NECX		= 10,
+	RC_PROTO_NEC32		= 11,
+	RC_PROTO_SANYO		= 12,
+	RC_PROTO_MCIR2_KBD	= 13,
+	RC_PROTO_MCIR2_MSE	= 14,
+	RC_PROTO_RC6_0		= 15,
+	RC_PROTO_RC6_6A_20	= 16,
+	RC_PROTO_RC6_6A_24	= 17,
+	RC_PROTO_RC6_6A_32	= 18,
+	RC_PROTO_RC6_MCE	= 19,
+	RC_PROTO_SHARP		= 20,
+	RC_PROTO_XMP		= 21,
+	RC_PROTO_CEC		= 22,
+};
+
 #endif