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Diffstat (limited to 'drivers/media/rc/img-ir/img-ir-sharp.c')
-rw-r--r--drivers/media/rc/img-ir/img-ir-sharp.c99
1 files changed, 99 insertions, 0 deletions
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,
+};