media/rc: Add new IR receiver to specify gpio number for IR sensor

This driver helps to register the device of GPIO based IR receiver, "gpio-ir-recv"
with the gpio number and pulse trigger when driver is loading. For example,

	# modprobe gpio-ir-recv
	# modprobe gpioplug-ir-recv gpio_nr=249 active_low=1

Change-Id: I5c16a5b108fcd34d90885d37345c84aa0ac5cf9c

drivers/media/rc/Kconfig

@@ -342,4 +342,14 @@ config RC_ST
 
 	 If you're not sure, select N here.
 
+config IR_GPIOPLUG_CIR
+	tristate "GPIOPLUG IR remote control"
+	depends on RC_CORE
+	select IR_GPIO_CIR
+	---help---
+	   Say Y if you want to use GPIOPLUG based IR Receiver.
+
+	   To compile this driver as a module, choose M here: the module will
+	   be called gpio-ir-recv.
+
 endif #RC_DEVICES

drivers/media/rc/Makefile

@@ -29,6 +29,7 @@ obj-$(CONFIG_IR_STREAMZAP) += streamzap.o
 obj-$(CONFIG_IR_WINBOND_CIR) += winbond-cir.o
 obj-$(CONFIG_RC_LOOPBACK) += rc-loopback.o
 obj-$(CONFIG_IR_GPIO_CIR) += gpio-ir-recv.o
+obj-$(CONFIG_IR_GPIOPLUG_CIR) += gpioplug-ir-recv.o
 obj-$(CONFIG_IR_IGUANA) += iguanair.o
 obj-$(CONFIG_IR_TTUSBIR) += ttusbir.o
 obj-$(CONFIG_RC_ST) += st_rc.o

drivers/media/rc/gpio-ir-recv.c

@@ -23,8 +23,6 @@
 #include <media/rc-core.h>
 #include <media/gpio-ir-recv.h>
 
-#define GPIO_IR_DRIVER_NAME	"gpio-rc-recv"
-#define GPIO_IR_DEVICE_NAME	"gpio_ir_recv"
 
 struct gpio_rc_dev {
 	struct rc_dev *rcdev;

drivers/media/rc/gpioplug-ir-recv.c

@@ -0,0 +1,90 @@
+/*
+ * Pluggable GPIO IR receiver
+ *
+ * Copyright (c) 2015 Dongjin Kim (tobetter@gmail.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <media/gpio-ir-recv.h>
+
+static unsigned gpio_nr = -1;
+module_param(gpio_nr, uint, 0);
+MODULE_PARM_DESC(gpio_nr, "GPIO number to receive IR pulse");
+
+static bool active_low = 1;
+module_param(active_low, bool, 0);
+MODULE_PARM_DESC(active_low,
+		"IR pulse trigger level, (1=low active, 0=high active");
+
+static struct platform_device *pdev;
+static struct gpio_ir_recv_platform_data *pdata;
+
+static int __init gpio_init(void)
+{
+	int rc = -ENOMEM;
+
+	if (gpio_nr == -1) {
+		pr_err("gpioplug-ir-recv: missing module parameter: 'gpio_nr'\n");
+		return -EINVAL;
+	}
+
+	pdev = platform_device_alloc(GPIO_IR_DRIVER_NAME, -1);
+	if (!pdev)
+		return rc;
+
+	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		goto err_free_platform_data;
+
+	pdev->dev.platform_data = pdata;
+
+	pdata->gpio_nr = gpio_nr;
+	pdata->active_low = active_low;
+	pdata->allowed_protos = 0;
+	pdata->map_name = NULL;
+
+	rc = platform_device_add(pdev);
+	if (rc < 0)
+		goto err_free_device;
+
+	dev_info(&pdev->dev,
+		"IR driver is initialized (gpio_nr=%d, pulse level=%s)\n",
+		pdata->gpio_nr, pdata->active_low ? "low" : "high");
+
+	return 0;
+
+err_free_platform_data:
+	kfree(pdata);
+
+err_free_device:
+	platform_device_put(pdev);
+
+	return rc;
+}
+
+static void __exit gpio_exit(void)
+{
+	dev_info(&pdev->dev, "gpioplug-ir-recv: IR driver is removed\n");
+	platform_device_unregister(pdev);
+}
+
+MODULE_DESCRIPTION("GPIO IR Receiver driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(gpio_init);
+module_exit(gpio_exit);

include/media/gpio-ir-recv.h

@@ -13,6 +13,9 @@
 #ifndef __GPIO_IR_RECV_H__
 #define __GPIO_IR_RECV_H__
 
+#define GPIO_IR_DRIVER_NAME	"gpio-rc-recv"
+#define GPIO_IR_DEVICE_NAME	"gpio_ir_recv"
+
 struct gpio_ir_recv_platform_data {
 	int		gpio_nr;
 	bool		active_low;