[media] rc: img-ir: add Sharp decoder module

Add an img-ir module for decoding the Sharp infrared protocol.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

4 files changed, 111 insertions, 0 deletions

diff --git a/drivers/media/rc/img-ir/Kconfig b/drivers/media/rc/img-ir/Kconfig
index ab365778b5d2..48627f9741be 100644
--- a/drivers/media/rc/img-ir/Kconfig
+++ b/drivers/media/rc/img-ir/Kconfig
@@ -45,3 +45,10 @@ config IR_IMG_SONY
         help
            Say Y here to enable support for the Sony protocol in the ImgTec
            infrared decoder block.
+
+config IR_IMG_SHARP
+        bool "Sharp protocol support"
+        depends on IR_IMG_HW
+        help
+           Say Y here to enable support for the Sharp protocol in the ImgTec
+           infrared decoder block.
diff --git a/drivers/media/rc/img-ir/Makefile b/drivers/media/rc/img-ir/Makefile
index 978c0c6713ab..792a3c4bc38f 100644
--- a/drivers/media/rc/img-ir/Makefile
+++ b/drivers/media/rc/img-ir/Makefile
@@ -4,6 +4,7 @@ img-ir-$(CONFIG_IR_IMG_HW)	+= img-ir-hw.o
 img-ir-$(CONFIG_IR_IMG_NEC)     += img-ir-nec.o
 img-ir-$(CONFIG_IR_IMG_JVC)     += img-ir-jvc.o
 img-ir-$(CONFIG_IR_IMG_SONY)    += img-ir-sony.o
+img-ir-$(CONFIG_IR_IMG_SHARP)   += img-ir-sharp.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 0d4f9211f9f2..9931dfaeb6ad 100644
--- a/drivers/media/rc/img-ir/img-ir-hw.c
+++ b/drivers/media/rc/img-ir/img-ir-hw.c
@@ -23,6 +23,7 @@ static DEFINE_SPINLOCK(img_ir_decoders_lock);
 extern struct img_ir_decoder img_ir_nec;
 extern struct img_ir_decoder img_ir_jvc;
 extern struct img_ir_decoder img_ir_sony;
+extern struct img_ir_decoder img_ir_sharp;
 
 static bool img_ir_decoders_preprocessed;
 static struct img_ir_decoder *img_ir_decoders[] = {
@@ -35,6 +36,9 @@ static struct img_ir_decoder *img_ir_decoders[] = {
 #ifdef CONFIG_IR_IMG_SONY
         &img_ir_sony,
 #endif
+#ifdef CONFIG_IR_IMG_SHARP
+        &img_ir_sharp,
+#endif
         NULL
 };
 
diff --git a/drivers/media/rc/img-ir/img-ir-sharp.c b/drivers/media/rc/img-ir/img-ir-sharp.c
new file mode 100644
index 000000000000..3397cc5a6794
--- /dev/null
+++ b/drivers/media/rc/img-ir/img-ir-sharp.c
@@ -0,0 +1,99 @@
+/*
+ * ImgTec IR Decoder setup for Sharp protocol.
+ *
+ * Copyright 2012-2014 Imagination Technologies Ltd.
+ */
+
+#include "img-ir-hw.h"
+
+/* Convert Sharp data to a scancode */
+static int img_ir_sharp_scancode(int len, u64 raw, int *scancode, u64 protocols)
+{
+        unsigned int addr, cmd, exp, chk;
+
+        if (len != 15)
+                return -EINVAL;
+
+        addr = (raw >>   0) & 0x1f;
+        cmd  = (raw >>   5) & 0xff;
+        exp  = (raw >>  13) &  0x1;
+        chk  = (raw >>  14) &  0x1;
+
+        /* validate data */
+        if (!exp)
+                return -EINVAL;
+        if (chk)
+                /* probably the second half of the message */
+                return -EINVAL;
+
+        *scancode = addr << 8 | cmd;
+        return IMG_IR_SCANCODE;
+}
+
+/* Convert Sharp scancode to Sharp data filter */
+static int img_ir_sharp_filter(const struct rc_scancode_filter *in,
+                               struct img_ir_filter *out, u64 protocols)
+{
+        unsigned int addr, cmd, exp = 0, chk = 0;
+        unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;
+
+        addr   = (in->data >> 8) & 0x1f;
+        addr_m = (in->mask >> 8) & 0x1f;
+        cmd    = (in->data >> 0) & 0xff;
+        cmd_m  = (in->mask >> 0) & 0xff;
+        if (cmd_m) {
+                /* if filtering commands, we can only match the first part */
+                exp   = 1;
+                exp_m = 1;
+                chk   = 0;
+                chk_m = 1;
+        }
+
+        out->data = addr        |
+                    cmd   <<  5 |
+                    exp   << 13 |
+                    chk   << 14;
+        out->mask = addr_m      |
+                    cmd_m <<  5 |
+                    exp_m << 13 |
+                    chk_m << 14;
+
+        return 0;
+}
+
+/*
+ * Sharp decoder
+ * See also http://www.sbprojects.com/knowledge/ir/sharp.php
+ */
+struct img_ir_decoder img_ir_sharp = {
+        .type = RC_BIT_SHARP,
+        .control = {
+                .decoden = 0,
+                .decodend2 = 1,
+                .code_type = IMG_IR_CODETYPE_PULSEDIST,
+                .d1validsel = 1,
+        },
+        /* main timings */
+        .tolerance = 20,        /* 20% */
+        .timings = {
+                /* 0 symbol */
+                .s10 = {
+                        .pulse = { 320  /* 320 us */ },
+                        .space = { 680  /* 1 ms period */ },
+                },
+                /* 1 symbol */
+                .s11 = {
+                        .pulse = { 320  /* 320 us */ },
+                        .space = { 1680 /* 2 ms period */ },
+                },
+                /* free time */
+                .ft = {
+                        .minlen = 15,
+                        .maxlen = 15,
+                        .ft_min = 5000, /* 5 ms */
+                },
+        },
+        /* scancode logic */
+        .scancode = img_ir_sharp_scancode,
+        .filter = img_ir_sharp_filter,
+};