GPT is a GPIO pin that is cable able of measuring the lenght of pulses.
GPTs are common on embedded systems
---
drivers/input/ir/Kconfig | 6 +
drivers/input/ir/Makefile | 1
drivers/input/ir/ir-gpt.c | 214 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 221 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/ir/ir-gpt.c
diff --git a/drivers/input/ir/Kconfig b/drivers/input/ir/Kconfig
index 8afd2d6..b80ab31 100644
--- a/drivers/input/ir/Kconfig
+++ b/drivers/input/ir/Kconfig
@@ -11,4 +11,10 @@ menuconfig INPUT_IR
if INPUT_IR
+config IR_GPT
+ tristate "GPT Based IR Receiver"
+ default m
+ help
+ Driver for GPT-based IR receiver found on Digispeaker
+
endif
diff --git a/drivers/input/ir/Makefile b/drivers/input/ir/Makefile
index 08e6954..7082f1d 100644
--- a/drivers/input/ir/Makefile
+++ b/drivers/input/ir/Makefile
@@ -3,3 +3,4 @@
# Each configuration option enables a list of files.
+obj-$(CONFIG_IR_GPT) += ir-gpt.o
diff --git a/drivers/input/ir/ir-gpt.c b/drivers/input/ir/ir-gpt.c
new file mode 100644
index 0000000..445ff27
--- /dev/null
+++ b/drivers/input/ir/ir-gpt.c
@@ -0,0 +1,214 @@
+/*
+ * GPT timer based IR device
+ *
+ * Copyright (C) 2008 Jon Smirl <jonsmirl@gmail.com>
+ */
+
+#define DEBUG
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/input.h>
+#include <asm/io.h>
+#include <asm/mpc52xx.h>
+
+#define MAX_SAMPLES 200
+
+struct ir_gpt {
+ int irq;
+ struct mpc52xx_gpt __iomem *regs;
+ spinlock_t lock;
+ struct work_struct queue;
+ int head, tail, previous;
+ unsigned int samples[MAX_SAMPLES];
+ struct input_dev *input;
+};
+
+static void ir_event(struct work_struct *work)
+{
+ unsigned long flags;
+ int delta, count;
+ unsigned int sample, wrap, bit;
+ struct ir_gpt *ir_gpt = container_of(work, struct ir_gpt, queue);
+
+ while (1) ...
