src/kernel/linux/v4.19/drivers/input/keyboard/mtk-pmic-keys.c - T800 - Gitiles

 /*
  * Copyright (C) 2017 MediaTek, Inc.
  *
  * Author: Chen Zhong <chen.zhong@mediatek.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * 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/input.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/mfd/mt6323/registers.h>
 #include <linux/mfd/mt6359/registers.h>
 #include <linux/mfd/mt6397/registers.h>
 #include <linux/mfd/mt6330/registers.h>
 //#include <linux/mfd/mt6397/core.h>
 #include <linux/mfd/mt6330/core.h>

 #define MTK_PMIC_PWRKEY_INDEX	0
 #define MTK_PMIC_HOMEKEY_INDEX	1
 #define MTK_PMIC_MAX_KEY_COUNT	2

 #define MT6397_PWRKEY_RST_SHIFT		6
 #define MT6397_HOMEKEY_RST_SHIFT	5
 #define MT6397_RST_DU_SHIFT		8

 #define MT6359_PWRKEY_RST_SHIFT		9
 #define MT6359_HOMEKEY_RST_SHIFT	8
 #define MT6359_RST_DU_SHIFT		12
 #define MT6330_PWRKEY_RST_SHIFT		1
 #define MT6330_RST_DU_SHIFT				4

 #define PWRKEY_RST_EN			0x1
 #define HOMEKEY_RST_EN			0x1
 #define RST_DU_MASK			0x3
 #define INVALID_VALUE	0

 struct mtk_pmic_keys_regs {
 	u32 deb_reg;
 	u32 deb_mask;
 	u32 intsel_reg;
 	u32 intsel_mask;
 };

 #define MTK_PMIC_KEYS_REGS(_deb_reg, _deb_mask,		\
 	_intsel_reg, _intsel_mask)			\
 {							\
 	.deb_reg		= _deb_reg,		\
 	.deb_mask		= _deb_mask,		\
 	.intsel_reg		= _intsel_reg,		\
 	.intsel_mask		= _intsel_mask,		\
 }

 #define RELEASE_IRQ_INTERVAL	1

 struct mtk_pmic_regs {
 	const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT];
 	bool release_irq;
 	u32 pmic_rst_reg;
 	u32 pwrkey_rst_shift;
 	u32 homekey_rst_shift;
 	u32 rst_du_shift;
 };

 static const struct mtk_pmic_regs mt6397_regs = {
 	.keys_regs[MTK_PMIC_PWRKEY_INDEX] =
 		MTK_PMIC_KEYS_REGS(MT6397_CHRSTATUS,
 		0x8, MT6397_INT_RSV, 0x10),
 	.keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
 		MTK_PMIC_KEYS_REGS(MT6397_OCSTATUS2,
 		0x10, MT6397_INT_RSV, 0x8),
 	.release_irq = false,
 	.pmic_rst_reg = MT6397_TOP_RST_MISC,
 	.pwrkey_rst_shift = MT6397_PWRKEY_RST_SHIFT,
 	.homekey_rst_shift = MT6397_HOMEKEY_RST_SHIFT,
 	.rst_du_shift = MT6397_RST_DU_SHIFT,
 };

 static const struct mtk_pmic_regs mt6323_regs = {
 	.keys_regs[MTK_PMIC_PWRKEY_INDEX] =
 		MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
 		0x2, MT6323_INT_MISC_CON, 0x10),
 	.keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
 		MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
 		0x4, MT6323_INT_MISC_CON, 0x8),
 	.release_irq = false,
 	.pmic_rst_reg = MT6323_TOP_RST_MISC,
 	.pwrkey_rst_shift = MT6397_PWRKEY_RST_SHIFT,
 	.homekey_rst_shift = MT6397_HOMEKEY_RST_SHIFT,
 	.rst_du_shift = MT6397_RST_DU_SHIFT,
 };

 static const struct mtk_pmic_regs mt6359_regs = {
 	.keys_regs[MTK_PMIC_PWRKEY_INDEX] =
 		MTK_PMIC_KEYS_REGS(INVALID_VALUE,
 		INVALID_VALUE, MT6359_PSC_TOP_INT_CON0, 0x1),
 	.keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
 		MTK_PMIC_KEYS_REGS(INVALID_VALUE,
 		INVALID_VALUE, MT6359_PSC_TOP_INT_CON0, 0x2),
 	.release_irq = true,
 	.pmic_rst_reg = MT6359_TOP_RST_MISC,
 	.pwrkey_rst_shift = MT6359_PWRKEY_RST_SHIFT,
 	.homekey_rst_shift = MT6359_HOMEKEY_RST_SHIFT,
 	.rst_du_shift = MT6359_RST_DU_SHIFT,
 };
 static const struct mtk_pmic_regs mt6330_regs = {
 	.keys_regs[MTK_PMIC_PWRKEY_INDEX] =
 		MTK_PMIC_KEYS_REGS(INVALID_VALUE,
 		INVALID_VALUE, MT6330_PSC_TOP_INT_CON0, 0x1),
 	.release_irq = true,
 	.pmic_rst_reg = MT6330_TOP_RST_MISC0,
 	.pwrkey_rst_shift = MT6330_PWRKEY_RST_SHIFT,
 	.rst_du_shift = MT6330_RST_DU_SHIFT,
 };

 struct mtk_pmic_keys_info {
 	struct mtk_pmic_keys *keys;
 	const struct mtk_pmic_keys_regs *regs;
 	unsigned int keycode;
 	int irq;
 	int release_irq_num;
 	bool wakeup:1;
 };

 struct mtk_pmic_keys {
 	struct input_dev *input_dev;
 	struct device *dev;
 	struct regmap *regmap;
 	struct mtk_pmic_keys_info keys[MTK_PMIC_MAX_KEY_COUNT];
 };

 enum mtk_pmic_keys_lp_mode {
 	LP_DISABLE,
 	LP_ONEKEY,
 	LP_TWOKEY,
 };

 static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys,
 		const struct mtk_pmic_regs *pmic_regs)
 {
 	int ret;
 	u32 long_press_mode, long_press_debounce;
 	u32 pmic_rst_reg = pmic_regs->pmic_rst_reg;
 	u32 pwrkey_rst = PWRKEY_RST_EN << pmic_regs->pwrkey_rst_shift;
 	u32 homekey_rst =
 		HOMEKEY_RST_EN << pmic_regs->homekey_rst_shift;

 	ret = of_property_read_u32(keys->dev->of_node,
 		"power-off-time-sec", &long_press_debounce);
 	if (ret)
 		long_press_debounce = 0;

 	regmap_update_bits(keys->regmap, pmic_rst_reg,
 			   RST_DU_MASK << pmic_regs->rst_du_shift,
 			   long_press_debounce << pmic_regs->rst_du_shift);

 	ret = of_property_read_u32(keys->dev->of_node,
 		"mediatek,long-press-mode", &long_press_mode);
 	if (ret)
 		long_press_mode = LP_DISABLE;

 	switch (long_press_mode) {
 	case LP_ONEKEY:
 		regmap_update_bits(keys->regmap, pmic_rst_reg,
 				   pwrkey_rst,
 				   pwrkey_rst);
 		regmap_update_bits(keys->regmap, pmic_rst_reg,
 				   homekey_rst,
 				   0);
 		break;
 	case LP_TWOKEY:
 		regmap_update_bits(keys->regmap, pmic_rst_reg,
 				   pwrkey_rst,
 				   pwrkey_rst);
 		regmap_update_bits(keys->regmap, pmic_rst_reg,
 				   homekey_rst,
 				   homekey_rst);
 		break;
 	case LP_DISABLE:
 		regmap_update_bits(keys->regmap, pmic_rst_reg,
 				   pwrkey_rst,
 				   0);
 		regmap_update_bits(keys->regmap, pmic_rst_reg,
 				   homekey_rst,
 				   0);
 		break;
 	default:
 		break;
 	}
 }

 static irqreturn_t mtk_pmic_keys_release_irq_handler_thread(
 				int irq, void *data)
 {
 	struct mtk_pmic_keys_info *info = data;

 	input_report_key(info->keys->input_dev, info->keycode, 0);
 	input_sync(info->keys->input_dev);

 	pr_info("release key =%d using PMIC\n",
 			info->keycode);

 	return IRQ_HANDLED;
 }

 static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
 {
 	struct mtk_pmic_keys_info *info = data;
 	u32 key_deb = 0, pressed;

 	if (info->release_irq_num > 0) {
 		pressed = 1;
 	} else {
 		regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb);
 		key_deb &= info->regs->deb_mask;
 		pressed = !key_deb;
 	}

 	input_report_key(info->keys->input_dev, info->keycode, pressed);
 	input_sync(info->keys->input_dev);

 	pr_info("(%s) key =%d using PMIC\n",
 		 pressed ? "pressed" : "released", info->keycode);

 	return IRQ_HANDLED;
 }

 static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys,
 		struct mtk_pmic_keys_info *info)
 {
 	int ret;

 	info->keys = keys;

 	ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg,
 				 info->regs->intsel_mask,
 				 info->regs->intsel_mask);
 	if (ret < 0)
 		return ret;

 	ret = devm_request_threaded_irq(keys->dev, info->irq, NULL,
 					mtk_pmic_keys_irq_handler_thread,
 					IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
 					"mtk-pmic-keys", info);
 	if (ret) {
 		dev_dbg(keys->dev, "Failed to request IRQ: %d: %d\n",
 			info->irq, ret);
 		return ret;
 	}

 	if (info->release_irq_num > 0) {
 		ret = devm_request_threaded_irq(keys->dev,
 				info->release_irq_num,
 				NULL, mtk_pmic_keys_release_irq_handler_thread,
 				IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
 				"mtk-pmic-keys", info);
 		if (ret) {
 			dev_dbg(keys->dev, "Failed to request IRQ: %d: %d\n",
 				info->release_irq_num, ret);
 			return ret;
 		}
 	}

 	input_set_capability(keys->input_dev, EV_KEY, info->keycode);

 	return 0;
 }

 static int __maybe_unused mtk_pmic_keys_suspend(struct device *dev)
 {
 	struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 	int index;

 	for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
 		if (keys->keys[index].wakeup)
 			enable_irq_wake(keys->keys[index].irq);
 	}

 	return 0;
 }

 static int __maybe_unused mtk_pmic_keys_resume(struct device *dev)
 {
 	struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
 	int index;

 	for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
 		if (keys->keys[index].wakeup)
 			disable_irq_wake(keys->keys[index].irq);
 	}

 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
 			mtk_pmic_keys_resume);

 static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = {
 	{
 		.compatible = "mediatek,mt6397-keys",
 		.data = &mt6397_regs,
 	}, {
 		.compatible = "mediatek,mt6323-keys",
 		.data = &mt6323_regs,
 	}, {
 		.compatible = "mediatek,mt6359-keys",
 		.data = &mt6359_regs,
 	}, {
 		.compatible = "mediatek,mt6330-keys",
 		.data = &mt6330_regs,
 	}, {
 		/* sentinel */
 	}
 };
 MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl);

 static int mtk_pmic_keys_probe(struct platform_device *pdev)
 {
 	int error, index = 0;
 	unsigned int keycount;
 	struct mt6330_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
 	struct device_node *node = pdev->dev.of_node, *child;
 	struct mtk_pmic_keys *keys;
 	const struct mtk_pmic_regs *mtk_pmic_regs;
 	struct input_dev *input_dev;
 	const struct of_device_id *of_id =
 		of_match_device(of_mtk_pmic_keys_match_tbl, &pdev->dev);

 	if(!of_id)
 		return -ENOMEM;

 	keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
 	if (!keys)
 		return -ENOMEM;

 	keys->dev = &pdev->dev;
 	keys->regmap = pmic_chip->regmap;
 	mtk_pmic_regs = of_id->data;

 	keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
 	if (!input_dev) {
 		dev_err(keys->dev, "input allocate device fail.\n");
 		return -ENOMEM;
 	}

 	input_dev->name = "mtk-pmic-keys";
 	input_dev->id.bustype = BUS_HOST;
 	input_dev->id.vendor = 0x0001;
 	input_dev->id.product = 0x0001;
 	input_dev->id.version = 0x0001;

 	__set_bit(EV_KEY, input_dev->evbit);
 	keycount = of_get_available_child_count(node);
 	if (keycount > MTK_PMIC_MAX_KEY_COUNT) {
 		dev_err(keys->dev, "too many keys defined (%d)\n", keycount);
 		return -EINVAL;
 	}

 	for_each_child_of_node(node, child) {
 		keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index];

 		keys->keys[index].irq = platform_get_irq(pdev, index);
 		if (keys->keys[index].irq < 0)
 			return keys->keys[index].irq;

 		if (mtk_pmic_regs->release_irq) {
 			keys->keys[index].release_irq_num = platform_get_irq(
 						pdev,
 						index + RELEASE_IRQ_INTERVAL);
 			if (keys->keys[index].release_irq_num < 0)
 				return keys->keys[index].release_irq_num;
 		}

 		error = of_property_read_u32(child,
 			"linux,keycodes", &keys->keys[index].keycode);
 		if (error) {
 			dev_err(keys->dev,
 				"failed to read key:%d linux,keycode property: %d\n",
 				index, error);
 			return error;
 		}

 		if (of_property_read_bool(child, "wakeup-source"))
 			keys->keys[index].wakeup = true;

 		error = mtk_pmic_key_setup(keys, &keys->keys[index]);
 		if (error) {
 			pr_info("Set key index = %d error.\n", index);
 			return error;
 		}

 		index++;
 	}

 	error = input_register_device(input_dev);
 	if (error) {
 		dev_err(&pdev->dev,
 			"register input device failed (%d)\n", error);
 		return error;
 	}

 	mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs);

 	platform_set_drvdata(pdev, keys);

 	return 0;
 }

 static struct platform_driver pmic_keys_pdrv = {
 	.probe = mtk_pmic_keys_probe,
 	.driver = {
 		   .name = "mtk-pmic-keys",
 		   .of_match_table = of_mtk_pmic_keys_match_tbl,
 		   .pm = &mtk_pmic_keys_pm_ops,
 	},
 };

 module_platform_driver(pmic_keys_pdrv);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
 MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");
	/*
	* Copyright (C) 2017 MediaTek, Inc.
	*
	* Author: Chen Zhong <chen.zhong@mediatek.com>
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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/input.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/mfd/mt6323/registers.h>
	#include <linux/mfd/mt6359/registers.h>
	#include <linux/mfd/mt6397/registers.h>
	#include <linux/mfd/mt6330/registers.h>
	//#include <linux/mfd/mt6397/core.h>
	#include <linux/mfd/mt6330/core.h>

	#define MTK_PMIC_PWRKEY_INDEX 0
	#define MTK_PMIC_HOMEKEY_INDEX 1
	#define MTK_PMIC_MAX_KEY_COUNT 2

	#define MT6397_PWRKEY_RST_SHIFT 6
	#define MT6397_HOMEKEY_RST_SHIFT 5
	#define MT6397_RST_DU_SHIFT 8

	#define MT6359_PWRKEY_RST_SHIFT 9
	#define MT6359_HOMEKEY_RST_SHIFT 8
	#define MT6359_RST_DU_SHIFT 12
	#define MT6330_PWRKEY_RST_SHIFT 1
	#define MT6330_RST_DU_SHIFT 4

	#define PWRKEY_RST_EN 0x1
	#define HOMEKEY_RST_EN 0x1
	#define RST_DU_MASK 0x3
	#define INVALID_VALUE 0

	struct mtk_pmic_keys_regs {
	u32 deb_reg;
	u32 deb_mask;
	u32 intsel_reg;
	u32 intsel_mask;
	};

	#define MTK_PMIC_KEYS_REGS(_deb_reg, _deb_mask, \
	_intsel_reg, _intsel_mask) \
	{ \
	.deb_reg = _deb_reg, \
	.deb_mask = _deb_mask, \
	.intsel_reg = _intsel_reg, \
	.intsel_mask = _intsel_mask, \
	}

	#define RELEASE_IRQ_INTERVAL 1

	struct mtk_pmic_regs {
	const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT];
	bool release_irq;
	u32 pmic_rst_reg;
	u32 pwrkey_rst_shift;
	u32 homekey_rst_shift;
	u32 rst_du_shift;
	};

	static const struct mtk_pmic_regs mt6397_regs = {
	.keys_regs[MTK_PMIC_PWRKEY_INDEX] =
	MTK_PMIC_KEYS_REGS(MT6397_CHRSTATUS,
	0x8, MT6397_INT_RSV, 0x10),
	.keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
	MTK_PMIC_KEYS_REGS(MT6397_OCSTATUS2,
	0x10, MT6397_INT_RSV, 0x8),
	.release_irq = false,
	.pmic_rst_reg = MT6397_TOP_RST_MISC,
	.pwrkey_rst_shift = MT6397_PWRKEY_RST_SHIFT,
	.homekey_rst_shift = MT6397_HOMEKEY_RST_SHIFT,
	.rst_du_shift = MT6397_RST_DU_SHIFT,
	};

	static const struct mtk_pmic_regs mt6323_regs = {
	.keys_regs[MTK_PMIC_PWRKEY_INDEX] =
	MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
	0x2, MT6323_INT_MISC_CON, 0x10),
	.keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
	MTK_PMIC_KEYS_REGS(MT6323_CHRSTATUS,
	0x4, MT6323_INT_MISC_CON, 0x8),
	.release_irq = false,
	.pmic_rst_reg = MT6323_TOP_RST_MISC,
	.pwrkey_rst_shift = MT6397_PWRKEY_RST_SHIFT,
	.homekey_rst_shift = MT6397_HOMEKEY_RST_SHIFT,
	.rst_du_shift = MT6397_RST_DU_SHIFT,
	};

	static const struct mtk_pmic_regs mt6359_regs = {
	.keys_regs[MTK_PMIC_PWRKEY_INDEX] =
	MTK_PMIC_KEYS_REGS(INVALID_VALUE,
	INVALID_VALUE, MT6359_PSC_TOP_INT_CON0, 0x1),
	.keys_regs[MTK_PMIC_HOMEKEY_INDEX] =
	MTK_PMIC_KEYS_REGS(INVALID_VALUE,
	INVALID_VALUE, MT6359_PSC_TOP_INT_CON0, 0x2),
	.release_irq = true,
	.pmic_rst_reg = MT6359_TOP_RST_MISC,
	.pwrkey_rst_shift = MT6359_PWRKEY_RST_SHIFT,
	.homekey_rst_shift = MT6359_HOMEKEY_RST_SHIFT,
	.rst_du_shift = MT6359_RST_DU_SHIFT,
	};
	static const struct mtk_pmic_regs mt6330_regs = {
	.keys_regs[MTK_PMIC_PWRKEY_INDEX] =
	MTK_PMIC_KEYS_REGS(INVALID_VALUE,
	INVALID_VALUE, MT6330_PSC_TOP_INT_CON0, 0x1),
	.release_irq = true,
	.pmic_rst_reg = MT6330_TOP_RST_MISC0,
	.pwrkey_rst_shift = MT6330_PWRKEY_RST_SHIFT,
	.rst_du_shift = MT6330_RST_DU_SHIFT,
	};

	struct mtk_pmic_keys_info {
	struct mtk_pmic_keys *keys;
	const struct mtk_pmic_keys_regs *regs;
	unsigned int keycode;
	int irq;
	int release_irq_num;
	bool wakeup:1;
	};

	struct mtk_pmic_keys {
	struct input_dev *input_dev;
	struct device *dev;
	struct regmap *regmap;
	struct mtk_pmic_keys_info keys[MTK_PMIC_MAX_KEY_COUNT];
	};

	enum mtk_pmic_keys_lp_mode {
	LP_DISABLE,
	LP_ONEKEY,
	LP_TWOKEY,
	};

	static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys,
	const struct mtk_pmic_regs *pmic_regs)
	{
	int ret;
	u32 long_press_mode, long_press_debounce;
	u32 pmic_rst_reg = pmic_regs->pmic_rst_reg;
	u32 pwrkey_rst = PWRKEY_RST_EN << pmic_regs->pwrkey_rst_shift;
	u32 homekey_rst =
	HOMEKEY_RST_EN << pmic_regs->homekey_rst_shift;

	ret = of_property_read_u32(keys->dev->of_node,
	"power-off-time-sec", &long_press_debounce);
	if (ret)
	long_press_debounce = 0;

	regmap_update_bits(keys->regmap, pmic_rst_reg,
	RST_DU_MASK << pmic_regs->rst_du_shift,
	long_press_debounce << pmic_regs->rst_du_shift);

	ret = of_property_read_u32(keys->dev->of_node,
	"mediatek,long-press-mode", &long_press_mode);
	if (ret)
	long_press_mode = LP_DISABLE;

	switch (long_press_mode) {
	case LP_ONEKEY:
	regmap_update_bits(keys->regmap, pmic_rst_reg,
	pwrkey_rst,
	pwrkey_rst);
	regmap_update_bits(keys->regmap, pmic_rst_reg,
	homekey_rst,
	0);
	break;
	case LP_TWOKEY:
	regmap_update_bits(keys->regmap, pmic_rst_reg,
	pwrkey_rst,
	pwrkey_rst);
	regmap_update_bits(keys->regmap, pmic_rst_reg,
	homekey_rst,
	homekey_rst);
	break;
	case LP_DISABLE:
	regmap_update_bits(keys->regmap, pmic_rst_reg,
	pwrkey_rst,
	0);
	regmap_update_bits(keys->regmap, pmic_rst_reg,
	homekey_rst,
	0);
	break;
	default:
	break;
	}
	}

	static irqreturn_t mtk_pmic_keys_release_irq_handler_thread(
	int irq, void *data)
	{
	struct mtk_pmic_keys_info *info = data;

	input_report_key(info->keys->input_dev, info->keycode, 0);
	input_sync(info->keys->input_dev);

	pr_info("release key =%d using PMIC\n",
	info->keycode);

	return IRQ_HANDLED;
	}

	static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
	{
	struct mtk_pmic_keys_info *info = data;
	u32 key_deb = 0, pressed;

	if (info->release_irq_num > 0) {
	pressed = 1;
	} else {
	regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb);
	key_deb &= info->regs->deb_mask;
	pressed = !key_deb;
	}

	input_report_key(info->keys->input_dev, info->keycode, pressed);
	input_sync(info->keys->input_dev);

	pr_info("(%s) key =%d using PMIC\n",
	pressed ? "pressed" : "released", info->keycode);

	return IRQ_HANDLED;
	}

	static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys,
	struct mtk_pmic_keys_info *info)
	{
	int ret;

	info->keys = keys;

	ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg,
	info->regs->intsel_mask,
	info->regs->intsel_mask);
	if (ret < 0)
	return ret;

	ret = devm_request_threaded_irq(keys->dev, info->irq, NULL,
	mtk_pmic_keys_irq_handler_thread,
	IRQF_ONESHOT \| IRQF_TRIGGER_HIGH,
	"mtk-pmic-keys", info);
	if (ret) {
	dev_dbg(keys->dev, "Failed to request IRQ: %d: %d\n",
	info->irq, ret);
	return ret;
	}

	if (info->release_irq_num > 0) {
	ret = devm_request_threaded_irq(keys->dev,
	info->release_irq_num,
	NULL, mtk_pmic_keys_release_irq_handler_thread,
	IRQF_ONESHOT \| IRQF_TRIGGER_HIGH,
	"mtk-pmic-keys", info);
	if (ret) {
	dev_dbg(keys->dev, "Failed to request IRQ: %d: %d\n",
	info->release_irq_num, ret);
	return ret;
	}
	}

	input_set_capability(keys->input_dev, EV_KEY, info->keycode);

	return 0;
	}

	static int __maybe_unused mtk_pmic_keys_suspend(struct device *dev)
	{
	struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
	int index;

	for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
	if (keys->keys[index].wakeup)
	enable_irq_wake(keys->keys[index].irq);
	}

	return 0;
	}

	static int __maybe_unused mtk_pmic_keys_resume(struct device *dev)
	{
	struct mtk_pmic_keys *keys = dev_get_drvdata(dev);
	int index;

	for (index = 0; index < MTK_PMIC_MAX_KEY_COUNT; index++) {
	if (keys->keys[index].wakeup)
	disable_irq_wake(keys->keys[index].irq);
	}

	return 0;
	}

	static SIMPLE_DEV_PM_OPS(mtk_pmic_keys_pm_ops, mtk_pmic_keys_suspend,
	mtk_pmic_keys_resume);

	static const struct of_device_id of_mtk_pmic_keys_match_tbl[] = {
	{
	.compatible = "mediatek,mt6397-keys",
	.data = &mt6397_regs,
	}, {
	.compatible = "mediatek,mt6323-keys",
	.data = &mt6323_regs,
	}, {
	.compatible = "mediatek,mt6359-keys",
	.data = &mt6359_regs,
	}, {
	.compatible = "mediatek,mt6330-keys",
	.data = &mt6330_regs,
	}, {
	/* sentinel */
	}
	};
	MODULE_DEVICE_TABLE(of, of_mtk_pmic_keys_match_tbl);

	static int mtk_pmic_keys_probe(struct platform_device *pdev)
	{
	int error, index = 0;
	unsigned int keycount;
	struct mt6330_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
	struct device_node node = pdev->dev.of_node, child;
	struct mtk_pmic_keys *keys;
	const struct mtk_pmic_regs *mtk_pmic_regs;
	struct input_dev *input_dev;
	const struct of_device_id *of_id =
	of_match_device(of_mtk_pmic_keys_match_tbl, &pdev->dev);

	if(!of_id)
	return -ENOMEM;

	keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
	if (!keys)
	return -ENOMEM;

	keys->dev = &pdev->dev;
	keys->regmap = pmic_chip->regmap;
	mtk_pmic_regs = of_id->data;

	keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
	if (!input_dev) {
	dev_err(keys->dev, "input allocate device fail.\n");
	return -ENOMEM;
	}

	input_dev->name = "mtk-pmic-keys";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0001;

	__set_bit(EV_KEY, input_dev->evbit);
	keycount = of_get_available_child_count(node);
	if (keycount > MTK_PMIC_MAX_KEY_COUNT) {
	dev_err(keys->dev, "too many keys defined (%d)\n", keycount);
	return -EINVAL;
	}

	for_each_child_of_node(node, child) {
	keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index];

	keys->keys[index].irq = platform_get_irq(pdev, index);
	if (keys->keys[index].irq < 0)
	return keys->keys[index].irq;

	if (mtk_pmic_regs->release_irq) {
	keys->keys[index].release_irq_num = platform_get_irq(
	pdev,
	index + RELEASE_IRQ_INTERVAL);
	if (keys->keys[index].release_irq_num < 0)
	return keys->keys[index].release_irq_num;
	}

	error = of_property_read_u32(child,
	"linux,keycodes", &keys->keys[index].keycode);
	if (error) {
	dev_err(keys->dev,
	"failed to read key:%d linux,keycode property: %d\n",
	index, error);
	return error;
	}

	if (of_property_read_bool(child, "wakeup-source"))
	keys->keys[index].wakeup = true;

	error = mtk_pmic_key_setup(keys, &keys->keys[index]);
	if (error) {
	pr_info("Set key index = %d error.\n", index);
	return error;
	}

	index++;
	}

	error = input_register_device(input_dev);
	if (error) {
	dev_err(&pdev->dev,
	"register input device failed (%d)\n", error);
	return error;
	}

	mtk_pmic_keys_lp_reset_setup(keys, mtk_pmic_regs);

	platform_set_drvdata(pdev, keys);

	return 0;
	}

	static struct platform_driver pmic_keys_pdrv = {
	.probe = mtk_pmic_keys_probe,
	.driver = {
	.name = "mtk-pmic-keys",
	.of_match_table = of_mtk_pmic_keys_match_tbl,
	.pm = &mtk_pmic_keys_pm_ops,
	},
	};

	module_platform_driver(pmic_keys_pdrv);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
	MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");