[media] ir-core: convert drivers/media/video/cx88 to ir-core

This patch converts the cx88 driver (for sampling hw) to use the
decoders provided by ir-core instead of the separate ones provided
by ir-functions (and gets rid of those).

The value for MO_DDS_IO had a comment saying it corresponded to
a 4kHz samplerate. That comment was unfortunately misleading. The
actual samplerate was something like 3250Hz.

The current value has been derived by analyzing the elapsed time
between interrupts for different values (knowing that each interrupt
corresponds to 32 samples).

Thanks to Mariusz Bialonczyk <manio@skyboo.net> for testing my patches
(about one a day for two weeks!) on actual hardware.

Signed-off-by: David Härdeman <david@hardeman.nu>
Acked-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/IR/ir-functions.c

@@ -111,140 +111,6 @@ u32 ir_extract_bits(u32 data, u32 mask)
 }
 EXPORT_SYMBOL_GPL(ir_extract_bits);
 
-static int inline getbit(u32 *samples, int bit)
-{
-	return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0;
-}
-
-/* sump raw samples for visual debugging ;) */
-int ir_dump_samples(u32 *samples, int count)
-{
-	int i, bit, start;
-
-	printk(KERN_DEBUG "ir samples: ");
-	start = 0;
-	for (i = 0; i < count * 32; i++) {
-		bit = getbit(samples,i);
-		if (bit)
-			start = 1;
-		if (0 == start)
-			continue;
-		printk("%s", bit ? "#" : "_");
-	}
-	printk("\n");
-	return 0;
-}
-EXPORT_SYMBOL_GPL(ir_dump_samples);
-
-/* decode raw samples, pulse distance coding used by NEC remotes */
-int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)
-{
-	int i,last,bit,len;
-	u32 curBit;
-	u32 value;
-
-	/* find start burst */
-	for (i = len = 0; i < count * 32; i++) {
-		bit = getbit(samples,i);
-		if (bit) {
-			len++;
-		} else {
-			if (len >= 29)
-				break;
-			len = 0;
-		}
-	}
-
-	/* start burst to short */
-	if (len < 29)
-		return 0xffffffff;
-
-	/* find start silence */
-	for (len = 0; i < count * 32; i++) {
-		bit = getbit(samples,i);
-		if (bit) {
-			break;
-		} else {
-			len++;
-		}
-	}
-
-	/* silence to short */
-	if (len < 7)
-		return 0xffffffff;
-
-	/* go decoding */
-	len   = 0;
-	last = 1;
-	value = 0; curBit = 1;
-	for (; i < count * 32; i++) {
-		bit  = getbit(samples,i);
-		if (last) {
-			if(bit) {
-				continue;
-			} else {
-				len = 1;
-			}
-		} else {
-			if (bit) {
-				if (len > (low + high) /2)
-					value |= curBit;
-				curBit <<= 1;
-				if (curBit == 1)
-					break;
-			} else {
-				len++;
-			}
-		}
-		last = bit;
-	}
-
-	return value;
-}
-EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);
-
-/* decode raw samples, biphase coding, used by rc5 for example */
-int ir_decode_biphase(u32 *samples, int count, int low, int high)
-{
-	int i,last,bit,len,flips;
-	u32 value;
-
-	/* find start bit (1) */
-	for (i = 0; i < 32; i++) {
-		bit = getbit(samples,i);
-		if (bit)
-			break;
-	}
-
-	/* go decoding */
-	len   = 0;
-	flips = 0;
-	value = 1;
-	for (; i < count * 32; i++) {
-		if (len > high)
-			break;
-		if (flips > 1)
-			break;
-		last = bit;
-		bit  = getbit(samples,i);
-		if (last == bit) {
-			len++;
-			continue;
-		}
-		if (len < low) {
-			len++;
-			flips++;
-			continue;
-		}
-		value <<= 1;
-		value |= bit;
-		flips = 0;
-		len   = 1;
-	}
-	return value;
-}
-EXPORT_SYMBOL_GPL(ir_decode_biphase);
-
 /* RC5 decoding stuff, moved from bttv-input.c to share it with
  * saa7134 */
 

drivers/media/video/cx88/Kconfig

@@ -1,6 +1,6 @@
 config VIDEO_CX88
 	tristate "Conexant 2388x (bt878 successor) support"
-	depends on VIDEO_DEV && PCI && I2C && INPUT
+	depends on VIDEO_DEV && PCI && I2C && INPUT && IR_CORE
 	select I2C_ALGOBIT
 	select VIDEO_BTCX
 	select VIDEOBUF_DMA_SG