forked from Minki/linux
e72b21abc8
Add an img-ir module for decoding the Sony infrared protocol. Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
/*
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* ImgTec IR Decoder setup for Sony (SIRC) protocol.
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*
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* Copyright 2012-2014 Imagination Technologies Ltd.
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*/
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#include "img-ir-hw.h"
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/* Convert Sony data to a scancode */
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static int img_ir_sony_scancode(int len, u64 raw, int *scancode, u64 protocols)
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{
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unsigned int dev, subdev, func;
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switch (len) {
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case 12:
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if (!(protocols & RC_BIT_SONY12))
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return -EINVAL;
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func = raw & 0x7f; /* first 7 bits */
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raw >>= 7;
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dev = raw & 0x1f; /* next 5 bits */
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subdev = 0;
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break;
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case 15:
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if (!(protocols & RC_BIT_SONY15))
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return -EINVAL;
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func = raw & 0x7f; /* first 7 bits */
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raw >>= 7;
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dev = raw & 0xff; /* next 8 bits */
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subdev = 0;
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break;
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case 20:
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if (!(protocols & RC_BIT_SONY20))
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return -EINVAL;
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func = raw & 0x7f; /* first 7 bits */
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raw >>= 7;
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dev = raw & 0x1f; /* next 5 bits */
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raw >>= 5;
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subdev = raw & 0xff; /* next 8 bits */
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break;
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default:
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return -EINVAL;
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}
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*scancode = dev << 16 | subdev << 8 | func;
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return IMG_IR_SCANCODE;
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}
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/* Convert NEC scancode to NEC data filter */
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static int img_ir_sony_filter(const struct rc_scancode_filter *in,
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struct img_ir_filter *out, u64 protocols)
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{
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unsigned int dev, subdev, func;
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unsigned int dev_m, subdev_m, func_m;
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unsigned int len = 0;
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dev = (in->data >> 16) & 0xff;
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dev_m = (in->mask >> 16) & 0xff;
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subdev = (in->data >> 8) & 0xff;
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subdev_m = (in->mask >> 8) & 0xff;
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func = (in->data >> 0) & 0x7f;
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func_m = (in->mask >> 0) & 0x7f;
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if (subdev & subdev_m) {
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/* can't encode subdev and higher device bits */
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if (dev & dev_m & 0xe0)
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return -EINVAL;
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/* subdevice (extended) bits only in 20 bit encoding */
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if (!(protocols & RC_BIT_SONY20))
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return -EINVAL;
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len = 20;
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dev_m &= 0x1f;
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} else if (dev & dev_m & 0xe0) {
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/* upper device bits only in 15 bit encoding */
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if (!(protocols & RC_BIT_SONY15))
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return -EINVAL;
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len = 15;
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subdev_m = 0;
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} else {
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/*
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* The hardware mask cannot distinguish high device bits and low
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* extended bits, so logically AND those bits of the masks
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* together.
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*/
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subdev_m &= (dev_m >> 5) | 0xf8;
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dev_m &= 0x1f;
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}
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/* ensure there aren't any bits straying between fields */
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dev &= dev_m;
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subdev &= subdev_m;
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/* write the hardware filter */
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out->data = func |
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dev << 7 |
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subdev << 15;
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out->mask = func_m |
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dev_m << 7 |
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subdev_m << 15;
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if (len) {
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out->minlen = len;
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out->maxlen = len;
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}
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return 0;
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}
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/*
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* Sony SIRC decoder
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* See also http://www.sbprojects.com/knowledge/ir/sirc.php
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* http://picprojects.org.uk/projects/sirc/sonysirc.pdf
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*/
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struct img_ir_decoder img_ir_sony = {
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.type = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20,
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.control = {
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.decoden = 1,
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.code_type = IMG_IR_CODETYPE_PULSELEN,
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},
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/* main timings */
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.unit = 600000, /* 600 us */
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.timings = {
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/* leader symbol */
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.ldr = {
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.pulse = { 4 /* 2.4 ms */ },
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.space = { 1 /* 600 us */ },
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},
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/* 0 symbol */
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.s00 = {
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.pulse = { 1 /* 600 us */ },
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.space = { 1 /* 600 us */ },
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},
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/* 1 symbol */
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.s01 = {
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.pulse = { 2 /* 1.2 ms */ },
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.space = { 1 /* 600 us */ },
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},
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/* free time */
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.ft = {
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.minlen = 12,
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.maxlen = 20,
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.ft_min = 10, /* 6 ms */
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},
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},
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/* scancode logic */
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.scancode = img_ir_sony_scancode,
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.filter = img_ir_sony_filter,
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};
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