drivers: input: powerkey for HISI 65xx SoC

4 files changed, 233 insertions, 6 deletions

diff --git a/arch/arm64/boot/dts/hi6220.dtsi b/arch/arm64/boot/dts/hi6220.dtsi
index 854b5ba5244..1ac7df22e6a 100644
--- a/arch/arm64/boot/dts/hi6220.dtsi
+++ b/arch/arm64/boot/dts/hi6220.dtsi
@@ -764,12 +764,12 @@
                 interrupt-controller;
                 pmu_irq_gpio = <&gpio_pmu_irq_n>;
                 status = "ok";
-                ponkey:ponkey@b1{
-                        compatible = "hisilicon,hi6552-powerkey";
-                        interrupt-parent = <&pmic>;
-                        interrupts = <6 0>, <5 0>, <4 0>;
-                        interrupt-names = "down", "up", "hold 1s";
-                };
+		ponkey:ponkey@b1{
+			compatible = "hisilicon,hi6552-powerkey";
+			interrupt-parent = <&pmic>;
+			interrupts = <6 0>, <5 0>, <4 0>;
+			interrupt-names = "down", "up", "hold 4s";
+		};
                 coul: coul@1 {
                         compatible = "hisilicon,hi6552-coul";
                         interrupt-parent = <&pmic>;
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 838824bc7d3..674e080d289 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -734,5 +734,13 @@ config INPUT_DRV2667_HAPTICS
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called drv260x-haptics.
+config HISI_POWERKEY
+
+	tristate "Hisilicon PMIC ONKEY support"
+	help
+	  Say Y to enable support for PMIC ONKEY.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called hisi_powerkey.
 
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index f77268edd9c..b79d7c3f9aa 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -70,3 +70,4 @@ 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
+obj-$(CONFIG_HISI_POWERKEY)		+= hisi_powerkey.o
diff --git a/drivers/input/misc/hisi_powerkey.c b/drivers/input/misc/hisi_powerkey.c
new file mode 100644
index 00000000000..aaa2cc80c4f
--- /dev/null
+++ b/drivers/input/misc/hisi_powerkey.c
@@ -0,0 +1,218 @@
+/*
+ * hisi_powerkey.c - Hisilicon MIC powerkey driver
+ *
+ * Copyright (C) 2013 Hisilicon Ltd.
+ * Copyright (C) 2015 Linaro Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/wakelock.h>
+#include <linux/reboot.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+
+/* irq_info : names match the device tree */
+const char *pressed_name = "down";
+const char *held_name = "hold 4s";
+const char *released_name = "up";
+
+/* the above held interrupt will trigger after 4 seconds */
+#define MAX_HELD_TIME	(4 * HZ)
+
+typedef irqreturn_t (*hi65xx_irq_handler) (int irq, void *data);
+enum { id_pressed, id_released, id_held, id_last };
+static struct hi65xx_pkey_irq_info {
+	hi65xx_irq_handler handler;
+	const char *name;
+	int irq;
+} irq_info[id_last];
+
+#define INIT_IRQINFO(x)						\
+do {								\
+	irq_info[id_##x].handler = irq_handler_id(x);		\
+	irq_info[id_##x].name = x##_name;			\
+	irq_info[id_##x].irq = -1;				\
+} while (0)
+
+struct hi65xx_priv {
+	struct wake_lock wlock;
+	struct input_dev *idev;
+};
+
+static struct key_report_pairs {
+	int code;
+	int value;
+} pkey_report[id_last] = {
+	[id_released] = { .code = KEY_POWER, .value = 0 },
+	[id_pressed] = { .code = KEY_POWER, .value = 1 },
+	[id_held] = { .code = KEY_RESTART, .value = 0 },
+};
+
+static inline void report_key(struct input_dev *dev, int id_action)
+{
+	/*
+	 * track the state of the key held event since only ON/OFF values are
+	 * allowed on EV_KEY types: KEY_RESTART will always toggle its value to
+	 * guarantee that the event is passed to handlers (dispossition update).
+	 */
+	if (id_action == id_held)
+		pkey_report[id_held].value ^= 1;
+
+	dev_dbg(dev->dev.parent, "received - code %d, value %d\n",
+		pkey_report[id_action].code,
+		pkey_report[id_action].value);
+
+	input_report_key(dev, pkey_report[id_action].code,
+		pkey_report[id_action].value);
+}
+
+/* irq handlers */
+#define irq_handler_id(x) button_irq_##x
+#define irq_handler_definition(action)				\
+static irqreturn_t button_irq_##action(int irq, void *q)	\
+{								\
+	struct hi65xx_priv *p = q;				\
+								\
+	if (irq != irq_info[id_##action].irq)			\
+		return IRQ_NONE;				\
+								\
+	wake_lock_timeout(&p->wlock, MAX_HELD_TIME);		\
+								\
+	report_key(p->idev, id_##action);			\
+	input_sync(p->idev);					\
+								\
+	return IRQ_HANDLED;					\
+}
+
+/*
+ * this device gives us three interrupts: power button pressed, released and
+ * held for four seconds.
+ */
+irq_handler_definition(released);
+irq_handler_definition(pressed);
+irq_handler_definition(held);
+
+static int hi65xx_powerkey_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct hi65xx_priv *priv;
+	int irq, i, ret;
+
+	if (NULL == pdev) {
+		dev_err(dev, "parameter error\n");
+		return -EINVAL;
+	}
+
+	/* interrupt names must match the device tree */
+	INIT_IRQINFO(released);
+	INIT_IRQINFO(pressed);
+	INIT_IRQINFO(held);
+
+	priv = devm_kzalloc(dev, sizeof(struct hi65xx_priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->idev = input_allocate_device();
+	if (!priv->idev) {
+		dev_err(&pdev->dev, "failed to allocate input device\n");
+		return -ENOENT;
+	}
+
+	priv->idev->evbit[0] = BIT_MASK(EV_KEY);
+	priv->idev->dev.parent = &pdev->dev;
+	priv->idev->phys = "hisi_on/input0";
+	priv->idev->name = "hisi_on";
+
+	__set_bit(pkey_report[id_released].code, priv->idev->keybit);
+	__set_bit(pkey_report[id_pressed].code, priv->idev->keybit);
+	__set_bit(pkey_report[id_held].code, priv->idev->keybit);
+
+	for (i = 0; i < ARRAY_SIZE(irq_info); i++) {
+
+		irq = platform_get_irq_byname(pdev, irq_info[i].name);
+		if (irq < 0) {
+			dev_err(dev, "couldn't get irq %s\n", irq_info[i].name);
+			ret = irq;
+			goto err_irq;
+		}
+
+		ret = devm_request_irq(dev, irq, irq_info[i].handler,
+			IRQF_NO_SUSPEND, irq_info[i].name, priv);
+		if (ret < 0) {
+			dev_err(dev, "couldn't get irq %s\n", irq_info[i].name);
+			goto err_irq;
+		}
+
+		irq_info[i].irq = irq;
+	}
+
+	wake_lock_init(&priv->wlock, WAKE_LOCK_SUSPEND, "hisi-powerkey");
+
+	ret = input_register_device(priv->idev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register input device: %d\n",
+			ret);
+		ret = -ENOENT;
+		goto err_register;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	return 0;
+
+err_register:
+	wake_lock_destroy(&priv->wlock);
+err_irq:
+	input_free_device(priv->idev);
+
+	return ret;
+}
+
+static int hi65xx_powerkey_remove(struct platform_device *pdev)
+{
+	struct hi65xx_priv *priv = platform_get_drvdata(pdev);
+
+	wake_lock_destroy(&priv->wlock);
+	input_unregister_device(priv->idev);
+
+	return 0;
+}
+
+static struct of_device_id hi65xx_powerkey_of_match[] = {
+	{ .compatible = "hisilicon,hi6552-powerkey", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, hi65xx_powerkey_of_match);
+
+static struct platform_driver hi65xx_powerkey_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "hi65xx-powerkey",
+		.of_match_table = hi65xx_powerkey_of_match,
+	},
+	.probe = hi65xx_powerkey_probe,
+	.remove  = hi65xx_powerkey_remove,
+};
+
+module_platform_driver(hi65xx_powerkey_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Zhiliang Xue <xuezhiliang@huawei.com");
+MODULE_DESCRIPTION("Hisi PMIC Power key driver");
+MODULE_LICENSE("GPL v2");
+
+