Input: add power key driver for Rockchip RK805 PMIC

This driver provides a input driver for the power key on the Rockchip RK805
PMIC.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/Kconfig

@@ -581,6 +581,17 @@ config INPUT_PWM_BEEPER
 	  To compile this driver as a module, choose M here: the module will be
 	  called pwm-beeper.
 
+config INPUT_RK805_PWRKEY
+	tristate "Rockchip RK805 PMIC power key support"
+	depends on MFD_RK808
+	help
+	  Select this option to enable power key driver for RK805.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called rk805_pwrkey.
+
 config INPUT_GPIO_ROTARY_ENCODER
 	tristate "Rotary encoders connected to GPIO pins"
 	depends on GPIOLIB || COMPILE_TEST

drivers/input/misc/Makefile

@@ -64,6 +64,7 @@ obj-$(CONFIG_INPUT_REGULATOR_HAPTIC)	+= regulator-haptic.o
 obj-$(CONFIG_INPUT_RETU_PWRBUTTON)	+= retu-pwrbutton.o
 obj-$(CONFIG_INPUT_AXP20X_PEK)		+= axp20x-pek.o
 obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER)	+= rotary_encoder.o
+obj-$(CONFIG_INPUT_RK805_PWRKEY)	+= rk805-pwrkey.o
 obj-$(CONFIG_INPUT_SGI_BTNS)		+= sgi_btns.o
 obj-$(CONFIG_INPUT_SIRFSOC_ONKEY)	+= sirfsoc-onkey.o
 obj-$(CONFIG_INPUT_SOC_BUTTON_ARRAY)	+= soc_button_array.o

drivers/input/misc/rk805-pwrkey.c

@@ -0,0 +1,111 @@
+/*
+ * Rockchip RK805 PMIC Power Key driver
+ *
+ * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author: Joseph Chen <chenjh@rock-chips.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.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+static irqreturn_t pwrkey_fall_irq(int irq, void *_pwr)
+{
+	struct input_dev *pwr = _pwr;
+
+	input_report_key(pwr, KEY_POWER, 1);
+	input_sync(pwr);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t pwrkey_rise_irq(int irq, void *_pwr)
+{
+	struct input_dev *pwr = _pwr;
+
+	input_report_key(pwr, KEY_POWER, 0);
+	input_sync(pwr);
+
+	return IRQ_HANDLED;
+}
+
+static int rk805_pwrkey_probe(struct platform_device *pdev)
+{
+	struct input_dev *pwr;
+	int fall_irq, rise_irq;
+	int err;
+
+	pwr = devm_input_allocate_device(&pdev->dev);
+	if (!pwr) {
+		dev_err(&pdev->dev, "Can't allocate power button\n");
+		return -ENOMEM;
+	}
+
+	pwr->name = "rk805 pwrkey";
+	pwr->phys = "rk805_pwrkey/input0";
+	pwr->id.bustype = BUS_HOST;
+	input_set_capability(pwr, EV_KEY, KEY_POWER);
+
+	fall_irq = platform_get_irq(pdev, 0);
+	if (fall_irq < 0) {
+		dev_err(&pdev->dev, "Can't get fall irq: %d\n", fall_irq);
+		return fall_irq;
+	}
+
+	rise_irq = platform_get_irq(pdev, 1);
+	if (rise_irq < 0) {
+		dev_err(&pdev->dev, "Can't get rise irq: %d\n", rise_irq);
+		return rise_irq;
+	}
+
+	err = devm_request_any_context_irq(&pwr->dev, fall_irq,
+					   pwrkey_fall_irq,
+					   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					   "rk805_pwrkey_fall", pwr);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't register fall irq: %d\n", err);
+		return err;
+	}
+
+	err = devm_request_any_context_irq(&pwr->dev, rise_irq,
+					   pwrkey_rise_irq,
+					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					   "rk805_pwrkey_rise", pwr);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't register rise irq: %d\n", err);
+		return err;
+	}
+
+	err = input_register_device(pwr);
+	if (err) {
+		dev_err(&pdev->dev, "Can't register power button: %d\n", err);
+		return err;
+	}
+
+	platform_set_drvdata(pdev, pwr);
+	device_init_wakeup(&pdev->dev, true);
+
+	return 0;
+}
+
+static struct platform_driver rk805_pwrkey_driver = {
+	.probe	= rk805_pwrkey_probe,
+	.driver	= {
+		.name = "rk805-pwrkey",
+	},
+};
+module_platform_driver(rk805_pwrkey_driver);
+
+MODULE_AUTHOR("Joseph Chen <chenjh@rock-chips.com>");
+MODULE_DESCRIPTION("RK805 PMIC Power Key driver");
+MODULE_LICENSE("GPL");