Add an img-ir module for decoding the NEC and extended NEC infrared
protocols.
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Cc: linux-media@xxxxxxxxxxxxxxx
---
drivers/media/rc/img-ir/Kconfig | 7 ++
drivers/media/rc/img-ir/Makefile | 1 +
drivers/media/rc/img-ir/img-ir-nec.c | 149 +++++++++++++++++++++++++++++++++++
3 files changed, 157 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..44d00227c6c4 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
+ tristate "NEC protocol support"
+ depends on IR_IMG && IR_IMG_HW
+ help
+ Say Y or M here to enable support for the NEC and extended 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..f3052878f092 100644
--- a/drivers/media/rc/img-ir/Makefile
+++ b/drivers/media/rc/img-ir/Makefile
@@ -4,3 +4,4 @@ img-ir-$(CONFIG_IR_IMG_HW) += img-ir-hw.o
img-ir-objs := $(img-ir-y)
obj-$(CONFIG_IR_IMG) += img-ir.o
+obj-$(CONFIG_IR_IMG_NEC) += img-ir-nec.o
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..ba376caafaf2
--- /dev/null
+++ b/drivers/media/rc/img-ir/img-ir-nec.c
@@ -0,0 +1,149 @@
+/*
+ * ImgTec IR Decoder setup for NEC protocol.
+ *
+ * Copyright 2010-2013 Imagination Technologies Ltd.
+ */
+
+#include <linux/module.h>
+
+#include "img-ir-hw.h"
+
+/* Convert NEC data to a scancode */
+static int img_ir_nec_scancode(int len, u64 raw, u64 protocols)
+{
+ unsigned int addr, addr_inv, data, data_inv;
+ int scancode;
+ /* a repeat code has no data */
+ if (!len)
+ return IMG_IR_REPEATCODE;
+ if (len != 32)
+ return IMG_IR_ERR_INVALID;
+ addr = (raw >> 0) & 0xff;
+ addr_inv = (raw >> 8) & 0xff;
+ data = (raw >> 16) & 0xff;
+ data_inv = (raw >> 24) & 0xff;
+ /* Validate data */
+ if ((data_inv ^ data) != 0xff)
+ return IMG_IR_ERR_INVALID;
+
+ if ((addr_inv ^ addr) != 0xff) {
+ /* Extended NEC */
+ scancode = addr << 16 |
+ addr_inv << 8 |
+ data;
+ } else {
+ /* Normal NEC */
+ scancode = addr << 8 |
+ data;
+ }
+ return scancode;
+}
+
+/* Convert NEC scancode to NEC data filter */
+static int img_ir_nec_filter(const struct img_ir_sc_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 = in->data & 0xff;
+ data_m = in->mask & 0xff;
+ data_inv = data ^ 0xff;
+
+ if (in->data & 0xff000000)
+ return -EINVAL;
+
+ if (in->data & 0x00ff0000) {
+ /* Extended NEC */
+ addr = (in->data >> 16) & 0xff;
+ addr_m = (in->mask >> 16) & 0xff;
+ addr_inv = (in->data >> 8) & 0xff;
+ addr_inv_m = (in->mask >> 8) & 0xff;
+ } else {
+ /* Normal NEC */
+ addr = (in->data >> 8) & 0xff;
+ addr_m = (in->mask >> 8) & 0xff;
+ addr_inv = addr ^ 0xff;
+ addr_inv_m = addr_m;
+ }
+
+ out->data = data_inv << 24 |
+ data << 16 |
+ addr_inv << 8 |
+ addr;
+ out->mask = data_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
+ */
+static 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,
+};
+
+static int __init img_ir_nec_init(void)
+{
+ return img_ir_register_decoder(&img_ir_nec);
+}
+module_init(img_ir_nec_init);
+
+static void __exit img_ir_nec_exit(void)
+{
+ img_ir_unregister_decoder(&img_ir_nec);
+}
+module_exit(img_ir_nec_exit);
+
+MODULE_AUTHOR("Imagination Technologies Ltd.");
+MODULE_DESCRIPTION("ImgTec IR NEC protocol support");
+MODULE_LICENSE("GPL");
--
1.8.1.2
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