From 635abb7054f204e036bc6afe41b1f50825294867 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Fri, 28 Feb 2014 20:28:56 -0300 Subject: [PATCH] [media] rc: img-ir: add NEC decoder module Add an img-ir module for decoding the NEC and extended NEC infrared protocols. Signed-off-by: James Hogan Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/img-ir/Kconfig | 7 ++ drivers/media/rc/img-ir/Makefile | 1 + drivers/media/rc/img-ir/img-ir-hw.c | 5 + drivers/media/rc/img-ir/img-ir-nec.c | 148 +++++++++++++++++++++++++++ 4 files changed, 161 insertions(+) create mode 100644 drivers/media/rc/img-ir/img-ir-nec.c diff --git a/drivers/media/rc/img-ir/Kconfig b/drivers/media/rc/img-ir/Kconfig index 60eaba6a0843..28498a294daa 100644 --- a/drivers/media/rc/img-ir/Kconfig +++ b/drivers/media/rc/img-ir/Kconfig @@ -24,3 +24,10 @@ config IR_IMG_HW signals in hardware. This is more reliable, consumes less processing power since only a single interrupt is received for each scancode, and allows an IR scancode to be used as a wake event. + +config IR_IMG_NEC + bool "NEC protocol support" + depends on IR_IMG_HW + help + Say Y here to enable support for the NEC, extended NEC, and 32-bit + NEC protocols in the ImgTec infrared decoder block. diff --git a/drivers/media/rc/img-ir/Makefile b/drivers/media/rc/img-ir/Makefile index 4ef86edec873..c4091973b35d 100644 --- a/drivers/media/rc/img-ir/Makefile +++ b/drivers/media/rc/img-ir/Makefile @@ -1,6 +1,7 @@ img-ir-y := img-ir-core.o img-ir-$(CONFIG_IR_IMG_RAW) += img-ir-raw.o img-ir-$(CONFIG_IR_IMG_HW) += img-ir-hw.o +img-ir-$(CONFIG_IR_IMG_NEC) += img-ir-nec.o img-ir-objs := $(img-ir-y) obj-$(CONFIG_IR_IMG) += img-ir.o diff --git a/drivers/media/rc/img-ir/img-ir-hw.c b/drivers/media/rc/img-ir/img-ir-hw.c index 21c8bbca8821..139f2c70e382 100644 --- a/drivers/media/rc/img-ir/img-ir-hw.c +++ b/drivers/media/rc/img-ir/img-ir-hw.c @@ -20,8 +20,13 @@ /* Decoders lock (only modified to preprocess them) */ static DEFINE_SPINLOCK(img_ir_decoders_lock); +extern struct img_ir_decoder img_ir_nec; + static bool img_ir_decoders_preprocessed; static struct img_ir_decoder *img_ir_decoders[] = { +#ifdef CONFIG_IR_IMG_NEC + &img_ir_nec, +#endif NULL }; diff --git a/drivers/media/rc/img-ir/img-ir-nec.c b/drivers/media/rc/img-ir/img-ir-nec.c new file mode 100644 index 000000000000..e7a731bc3a9b --- /dev/null +++ b/drivers/media/rc/img-ir/img-ir-nec.c @@ -0,0 +1,148 @@ +/* + * ImgTec IR Decoder setup for NEC protocol. + * + * Copyright 2010-2014 Imagination Technologies Ltd. + */ + +#include "img-ir-hw.h" + +/* Convert NEC data to a scancode */ +static int img_ir_nec_scancode(int len, u64 raw, int *scancode, u64 protocols) +{ + unsigned int addr, addr_inv, data, data_inv; + /* a repeat code has no data */ + if (!len) + return IMG_IR_REPEATCODE; + if (len != 32) + return -EINVAL; + /* raw encoding: ddDDaaAA */ + addr = (raw >> 0) & 0xff; + addr_inv = (raw >> 8) & 0xff; + data = (raw >> 16) & 0xff; + data_inv = (raw >> 24) & 0xff; + if ((data_inv ^ data) != 0xff) { + /* 32-bit NEC (used by Apple and TiVo remotes) */ + /* scan encoding: aaAAddDD */ + *scancode = addr_inv << 24 | + addr << 16 | + data_inv << 8 | + data; + } else if ((addr_inv ^ addr) != 0xff) { + /* Extended NEC */ + /* scan encoding: AAaaDD */ + *scancode = addr << 16 | + addr_inv << 8 | + data; + } else { + /* Normal NEC */ + /* scan encoding: AADD */ + *scancode = addr << 8 | + data; + } + return IMG_IR_SCANCODE; +} + +/* Convert NEC scancode to NEC data filter */ +static int img_ir_nec_filter(const struct rc_scancode_filter *in, + struct img_ir_filter *out, u64 protocols) +{ + unsigned int addr, addr_inv, data, data_inv; + unsigned int addr_m, addr_inv_m, data_m, data_inv_m; + + data = in->data & 0xff; + data_m = in->mask & 0xff; + + if ((in->data | in->mask) & 0xff000000) { + /* 32-bit NEC (used by Apple and TiVo remotes) */ + /* scan encoding: aaAAddDD */ + addr_inv = (in->data >> 24) & 0xff; + addr_inv_m = (in->mask >> 24) & 0xff; + addr = (in->data >> 16) & 0xff; + addr_m = (in->mask >> 16) & 0xff; + data_inv = (in->data >> 8) & 0xff; + data_inv_m = (in->mask >> 8) & 0xff; + } else if ((in->data | in->mask) & 0x00ff0000) { + /* Extended NEC */ + /* scan encoding AAaaDD */ + addr = (in->data >> 16) & 0xff; + addr_m = (in->mask >> 16) & 0xff; + addr_inv = (in->data >> 8) & 0xff; + addr_inv_m = (in->mask >> 8) & 0xff; + data_inv = data ^ 0xff; + data_inv_m = data_m; + } else { + /* Normal NEC */ + /* scan encoding: AADD */ + addr = (in->data >> 8) & 0xff; + addr_m = (in->mask >> 8) & 0xff; + addr_inv = addr ^ 0xff; + addr_inv_m = addr_m; + data_inv = data ^ 0xff; + data_inv_m = data_m; + } + + /* raw encoding: ddDDaaAA */ + out->data = data_inv << 24 | + data << 16 | + addr_inv << 8 | + addr; + out->mask = data_inv_m << 24 | + data_m << 16 | + addr_inv_m << 8 | + addr_m; + return 0; +} + +/* + * NEC decoder + * See also http://www.sbprojects.com/knowledge/ir/nec.php + * http://wiki.altium.com/display/ADOH/NEC+Infrared+Transmission+Protocol + */ +struct img_ir_decoder img_ir_nec = { + .type = RC_BIT_NEC, + .control = { + .decoden = 1, + .code_type = IMG_IR_CODETYPE_PULSEDIST, + }, + /* main timings */ + .unit = 562500, /* 562.5 us */ + .timings = { + /* leader symbol */ + .ldr = { + .pulse = { 16 /* 9ms */ }, + .space = { 8 /* 4.5ms */ }, + }, + /* 0 symbol */ + .s00 = { + .pulse = { 1 /* 562.5 us */ }, + .space = { 1 /* 562.5 us */ }, + }, + /* 1 symbol */ + .s01 = { + .pulse = { 1 /* 562.5 us */ }, + .space = { 3 /* 1687.5 us */ }, + }, + /* free time */ + .ft = { + .minlen = 32, + .maxlen = 32, + .ft_min = 10, /* 5.625 ms */ + }, + }, + /* repeat codes */ + .repeat = 108, /* 108 ms */ + .rtimings = { + /* leader symbol */ + .ldr = { + .space = { 4 /* 2.25 ms */ }, + }, + /* free time */ + .ft = { + .minlen = 0, /* repeat code has no data */ + .maxlen = 0, + }, + }, + /* scancode logic */ + .scancode = img_ir_nec_scancode, + .filter = img_ir_nec_filter, +}; -- 2.34.1