input: stpmic1: Add STPMIC1 onkey driver

The STPMIC1 pmic is able to manage an onkey button. This driver exposes
the STPMIC1 onkey as an input device. It can also be configured to
shut-down the power supplies on a long key-press with an adjustable
duration.
Signed-off-by: Pascal Paillet <p.paillet@st.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/input/misc/Kconfig

@@ -851,4 +851,15 @@ config INPUT_SC27XX_VIBRA
 	  To compile this driver as a module, choose M here. The module will
 	  be called sc27xx_vibra.
 
+config INPUT_STPMIC1_ONKEY
+	tristate "STPMIC1 PMIC Onkey support"
+	depends on MFD_STPMIC1
+	help
+	  Say Y to enable support of onkey embedded into STPMIC1 PMIC. onkey
+	  can be used to wakeup from low power modes and force a shut-down on
+	  long press.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called stpmic1_onkey.
+
 endif

drivers/input/misc/Makefile

@@ -71,6 +71,7 @@ obj-$(CONFIG_INPUT_SGI_BTNS)		+= sgi_btns.o
 obj-$(CONFIG_INPUT_SIRFSOC_ONKEY)	+= sirfsoc-onkey.o
 obj-$(CONFIG_INPUT_SOC_BUTTON_ARRAY)	+= soc_button_array.o
 obj-$(CONFIG_INPUT_SPARCSPKR)		+= sparcspkr.o
+obj-$(CONFIG_INPUT_STPMIC1_ONKEY)  	+= stpmic1_onkey.o
 obj-$(CONFIG_INPUT_TPS65218_PWRBUTTON)	+= tps65218-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL4030_PWRBUTTON)	+= twl4030-pwrbutton.o
 obj-$(CONFIG_INPUT_TWL4030_VIBRA)	+= twl4030-vibra.o
@@ -81,3 +82,4 @@ obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
 obj-$(CONFIG_INPUT_XEN_KBDDEV_FRONTEND)	+= xen-kbdfront.o
 obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
 obj-$(CONFIG_INPUT_IDEAPAD_SLIDEBAR)	+= ideapad_slidebar.o
+

drivers/input/misc/stpmic1_onkey.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) STMicroelectronics 2018
+// Author: Pascal Paillet <p.paillet@st.com> for STMicroelectronics.
+
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/stpmic1.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+/**
+ * struct stpmic1_onkey - OnKey data
+ * @input_dev:		pointer to input device
+ * @irq_falling:	irq that we are hooked on to
+ * @irq_rising:		irq that we are hooked on to
+ */
+struct stpmic1_onkey {
+	struct input_dev *input_dev;
+	int irq_falling;
+	int irq_rising;
+};
+
+static irqreturn_t onkey_falling_irq(int irq, void *ponkey)
+{
+	struct stpmic1_onkey *onkey = ponkey;
+	struct input_dev *input_dev = onkey->input_dev;
+
+	input_report_key(input_dev, KEY_POWER, 1);
+	pm_wakeup_event(input_dev->dev.parent, 0);
+	input_sync(input_dev);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t onkey_rising_irq(int irq, void *ponkey)
+{
+	struct stpmic1_onkey *onkey = ponkey;
+	struct input_dev *input_dev = onkey->input_dev;
+
+	input_report_key(input_dev, KEY_POWER, 0);
+	pm_wakeup_event(input_dev->dev.parent, 0);
+	input_sync(input_dev);
+
+	return IRQ_HANDLED;
+}
+
+static int stpmic1_onkey_probe(struct platform_device *pdev)
+{
+	struct stpmic1 *pmic = dev_get_drvdata(pdev->dev.parent);
+	struct device *dev = &pdev->dev;
+	struct input_dev *input_dev;
+	struct stpmic1_onkey *onkey;
+	unsigned int val, reg = 0;
+	int error;
+
+	onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
+	if (!onkey)
+		return -ENOMEM;
+
+	onkey->irq_falling = platform_get_irq_byname(pdev, "onkey-falling");
+	if (onkey->irq_falling < 0) {
+		dev_err(dev, "failed: request IRQ onkey-falling %d\n",
+			onkey->irq_falling);
+		return onkey->irq_falling;
+	}
+
+	onkey->irq_rising = platform_get_irq_byname(pdev, "onkey-rising");
+	if (onkey->irq_rising < 0) {
+		dev_err(dev, "failed: request IRQ onkey-rising %d\n",
+			onkey->irq_rising);
+		return onkey->irq_rising;
+	}
+
+	if (!device_property_read_u32(dev, "power-off-time-sec", &val)) {
+		if (val > 0 && val <= 16) {
+			dev_dbg(dev, "power-off-time=%d seconds\n", val);
+			reg |= PONKEY_PWR_OFF;
+			reg |= ((16 - val) & PONKEY_TURNOFF_TIMER_MASK);
+		} else {
+			dev_err(dev, "power-off-time-sec out of range\n");
+			return -EINVAL;
+		}
+	}
+
+	if (device_property_present(dev, "st,onkey-clear-cc-flag"))
+		reg |= PONKEY_CC_FLAG_CLEAR;
+
+	error = regmap_update_bits(pmic->regmap, PKEY_TURNOFF_CR,
+				   PONKEY_TURNOFF_MASK, reg);
+	if (error) {
+		dev_err(dev, "PKEY_TURNOFF_CR write failed: %d\n", error);
+		return error;
+	}
+
+	if (device_property_present(dev, "st,onkey-pu-inactive")) {
+		error = regmap_update_bits(pmic->regmap, PADS_PULL_CR,
+					   PONKEY_PU_INACTIVE,
+					   PONKEY_PU_INACTIVE);
+		if (error) {
+			dev_err(dev, "ONKEY Pads configuration failed: %d\n",
+				error);
+			return error;
+		}
+	}
+
+	input_dev = devm_input_allocate_device(dev);
+	if (!input_dev) {
+		dev_err(dev, "Can't allocate Pwr Onkey Input Device\n");
+		return -ENOMEM;
+	}
+
+	input_dev->name = "pmic_onkey";
+	input_dev->phys = "pmic_onkey/input0";
+
+	input_set_capability(input_dev, EV_KEY, KEY_POWER);
+
+	onkey->input_dev = input_dev;
+
+	/* interrupt is nested in a thread */
+	error = devm_request_threaded_irq(dev, onkey->irq_falling, NULL,
+					  onkey_falling_irq, IRQF_ONESHOT,
+					  dev_name(dev), onkey);
+	if (error) {
+		dev_err(dev, "Can't get IRQ Onkey Falling: %d\n", error);
+		return error;
+	}
+
+	error = devm_request_threaded_irq(dev, onkey->irq_rising, NULL,
+					  onkey_rising_irq, IRQF_ONESHOT,
+					  dev_name(dev), onkey);
+	if (error) {
+		dev_err(dev, "Can't get IRQ Onkey Rising: %d\n", error);
+		return error;
+	}
+
+	error = input_register_device(input_dev);
+	if (error) {
+		dev_err(dev, "Can't register power button: %d\n", error);
+		return error;
+	}
+
+	platform_set_drvdata(pdev, onkey);
+	device_init_wakeup(dev, true);
+
+	return 0;
+}
+
+static int __maybe_unused stpmic1_onkey_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
+
+	if (device_may_wakeup(dev)) {
+		enable_irq_wake(onkey->irq_falling);
+		enable_irq_wake(onkey->irq_rising);
+	}
+	return 0;
+}
+
+static int __maybe_unused stpmic1_onkey_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
+
+	if (device_may_wakeup(dev)) {
+		disable_irq_wake(onkey->irq_falling);
+		disable_irq_wake(onkey->irq_rising);
+	}
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(stpmic1_onkey_pm,
+			 stpmic1_onkey_suspend,
+			 stpmic1_onkey_resume);
+
+static const struct of_device_id of_stpmic1_onkey_match[] = {
+	{ .compatible = "st,stpmic1-onkey" },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, of_stpmic1_onkey_match);
+
+static struct platform_driver stpmic1_onkey_driver = {
+	.probe	= stpmic1_onkey_probe,
+	.driver	= {
+		.name	= "stpmic1_onkey",
+		.of_match_table = of_match_ptr(of_stpmic1_onkey_match),
+		.pm	= &stpmic1_onkey_pm,
+	},
+};
+module_platform_driver(stpmic1_onkey_driver);
+
+MODULE_DESCRIPTION("Onkey driver for STPMIC1");
+MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
+MODULE_LICENSE("GPL v2");