[media] rc: img-ir: add NEC decoder module (635abb70) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/media/rc/img-ir/Kconfig

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		@@ -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.

drivers/media/rc/img-ir/Makefile

+1 −0

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		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

drivers/media/rc/img-ir/img-ir-hw.c

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		@@ -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
		};

drivers/media/rc/img-ir/img-ir-nec.c

0 → 100644

+148 −0

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		/*
		* 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,
		};