From 2997137be8eba5bf9c07a24d5fda1f4225f9ca7d Mon Sep 17 00:00:00 2001 From: David Härdeman Date: Fri, 29 Oct 2010 16:08:02 -0300 Subject: [media] ir-core: convert drivers/media/video/cx88 to ir-core MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 for testing my patches (about one a day for two weeks!) on actual hardware. Signed-off-by: David Härdeman Acked-by: Jarod Wilson Signed-off-by: Mauro Carvalho Chehab --- drivers/media/IR/ir-functions.c | 134 ---------------------------------------- 1 file changed, 134 deletions(-) (limited to 'drivers/media/IR') diff --git a/drivers/media/IR/ir-functions.c b/drivers/media/IR/ir-functions.c index db591e421887..f4c411535f3d 100644 --- a/drivers/media/IR/ir-functions.c +++ b/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 */ -- cgit v1.2.3