V4L/DVB (13575): em28xx: Use the complete address/command RC5 code for WinTV USB2

This device uses an i2c chip to retrieve the keycode from a RC5 remote.
Instead of just getting 6 bits, improve the routine to get 11 bits.

This means that the complete RC5 table for Hauppauge Grey IR can be used
with this device.

Unfortunately, it seems that this IR receiver is not capable of getting
the full 14 (or 13 bits) from the RC5 protocol.

At lest now, with the new code, it is possible to replace this IR table
by another RC5 table.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 29 insertions, 12 deletions

diff --git a/drivers/media/video/em28xx/em28xx-input.c b/drivers/media/video/em28xx/em28xx-input.c
index 3f5cf02f3147..5ddeb421ed58 100644
--- a/drivers/media/video/em28xx/em28xx-input.c
+++ b/drivers/media/video/em28xx/em28xx-input.c
@@ -112,10 +112,13 @@ int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
 {
 	unsigned char buf[2];
-	unsigned char code;
+	u16 code;
+	int size;
 
 	/* poll IR chip */
-	if (2 != i2c_master_recv(ir->c, buf, 2))
+	size = i2c_master_recv(ir->c, buf, sizeof(buf));
+
+	if (size != 2)
 		return -EIO;
 
 	/* Does eliminate repeated parity code */
@@ -124,16 +127,30 @@ int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
 
 	ir->old = buf[1];
 
-	/* Rearranges bits to the right order */
-	code =   ((buf[0]&0x01)<<5) | /* 0010 0000 */
-		 ((buf[0]&0x02)<<3) | /* 0001 0000 */
-		 ((buf[0]&0x04)<<1) | /* 0000 1000 */
-		 ((buf[0]&0x08)>>1) | /* 0000 0100 */
-		 ((buf[0]&0x10)>>3) | /* 0000 0010 */
-		 ((buf[0]&0x20)>>5);  /* 0000 0001 */
-
-	i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
-			code, buf[0]);
+	/*
+	 * Rearranges bits to the right order.
+	 * The bit order were determined experimentally by using
+	 * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
+	 * The RC5 code has 14 bits, but we've experimentally determined
+	 * the meaning for only 11 bits.
+	 * So, the code translation is not complete. Yet, it is enough to
+	 * work with the provided RC5 IR.
+	 */
+	code =
+		 ((buf[0] & 0x01) ? 0x0020 : 0) | /* 		0010 0000 */
+		 ((buf[0] & 0x02) ? 0x0010 : 0) | /* 		0001 0000 */
+		 ((buf[0] & 0x04) ? 0x0008 : 0) | /* 		0000 1000 */
+		 ((buf[0] & 0x08) ? 0x0004 : 0) | /* 		0000 0100 */
+		 ((buf[0] & 0x10) ? 0x0002 : 0) | /* 		0000 0010 */
+		 ((buf[0] & 0x20) ? 0x0001 : 0) | /* 		0000 0001 */
+		 ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000		  */
+		 ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000		  */
+		 ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100		  */
+		 ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010		  */
+		 ((buf[1] & 0x80) ? 0x0100 : 0);  /* 0000 0001		  */
+
+	i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x%02x)\n",
+			code, buf[1], buf[0]);
 
 	/* return key */
 	*ir_key = code;