Commit 3e9f0b3e authored by Chen Zhong's avatar Chen Zhong Committed by Lee Jones
Browse files

input: Add MediaTek PMIC keys support 



This patch add support to handle MediaTek PMIC MT6397/MT6323 key
interrupts including pwrkey and homekey, also add setting for
long press key shutdown behavior.

Signed-off-by: default avatarChen Zhong <chen.zhong@mediatek.com>
Acked-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 8f59e8cb

drivers/input/keyboard/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -747,4 +747,13 @@ config KEYBOARD_BCM 
	  To compile this driver as a module, choose M here: the

	  module will be called bcm-keypad.



config KEYBOARD_MTK_PMIC

	tristate "MediaTek PMIC keys support"

	depends on MFD_MT6397

	help

	  Say Y here if you want to use the pmic keys (powerkey/homekey).



	  To compile this driver as a module, choose M here: the

	  module will be called pmic-keys.



endif

drivers/input/keyboard/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ obj-$(CONFIG_KEYBOARD_MATRIX) += matrix_keypad.o 
obj-$(CONFIG_KEYBOARD_MAX7359)		+= max7359_keypad.o

obj-$(CONFIG_KEYBOARD_MCS)		+= mcs_touchkey.o

obj-$(CONFIG_KEYBOARD_MPR121)		+= mpr121_touchkey.o

obj-$(CONFIG_KEYBOARD_MTK_PMIC) 	+= mtk-pmic-keys.o

obj-$(CONFIG_KEYBOARD_NEWTON)		+= newtonkbd.o

obj-$(CONFIG_KEYBOARD_NOMADIK)		+= nomadik-ske-keypad.o

obj-$(CONFIG_KEYBOARD_NSPIRE)		+= nspire-keypad.o

drivers/input/keyboard/mtk-pmic-keys.c

0 → 100644
+339 −0
Original line number Diff line number Diff line 
/*

 * 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/module.h>

#include <linux/kernel.h>

#include <linux/input.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/kernel.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/regmap.h>

#include <linux/mfd/mt6323/registers.h>

#include <linux/mfd/mt6397/registers.h>

#include <linux/mfd/mt6397/core.h>



#define MTK_PMIC_PWRKEY_RST_EN_MASK	0x1

#define MTK_PMIC_PWRKEY_RST_EN_SHIFT	6

#define MTK_PMIC_HOMEKEY_RST_EN_MASK	0x1

#define MTK_PMIC_HOMEKEY_RST_EN_SHIFT	5

#define MTK_PMIC_RST_DU_MASK		0x3

#define MTK_PMIC_RST_DU_SHIFT		8



#define MTK_PMIC_PWRKEY_RST		\

	(MTK_PMIC_PWRKEY_RST_EN_MASK << MTK_PMIC_PWRKEY_RST_EN_SHIFT)

#define MTK_PMIC_HOMEKEY_RST		\

	(MTK_PMIC_HOMEKEY_RST_EN_MASK << MTK_PMIC_HOMEKEY_RST_EN_SHIFT)



#define MTK_PMIC_PWRKEY_INDEX	0

#define MTK_PMIC_HOMEKEY_INDEX	1

#define MTK_PMIC_MAX_KEY_COUNT	2



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,		\

}



struct mtk_pmic_regs {

	const struct mtk_pmic_keys_regs keys_regs[MTK_PMIC_MAX_KEY_COUNT];

	u32 pmic_rst_reg;

};



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),

	.pmic_rst_reg = MT6397_TOP_RST_MISC,

};



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),

	.pmic_rst_reg = MT6323_TOP_RST_MISC,

};



struct mtk_pmic_keys_info {

	struct mtk_pmic_keys *keys;

	const struct mtk_pmic_keys_regs *regs;

	unsigned int keycode;

	int irq;

	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,

		u32 pmic_rst_reg)

{

	int ret;

	u32 long_press_mode, long_press_debounce;



	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,

			   MTK_PMIC_RST_DU_MASK << MTK_PMIC_RST_DU_SHIFT,

			   long_press_debounce << MTK_PMIC_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,

				   MTK_PMIC_PWRKEY_RST,

				   MTK_PMIC_PWRKEY_RST);

		regmap_update_bits(keys->regmap, pmic_rst_reg,

				   MTK_PMIC_HOMEKEY_RST,

				   0);

		break;

	case LP_TWOKEY:

		regmap_update_bits(keys->regmap, pmic_rst_reg,

				   MTK_PMIC_PWRKEY_RST,

				   MTK_PMIC_PWRKEY_RST);

		regmap_update_bits(keys->regmap, pmic_rst_reg,

				   MTK_PMIC_HOMEKEY_RST,

				   MTK_PMIC_HOMEKEY_RST);

		break;

	case LP_DISABLE:

		regmap_update_bits(keys->regmap, pmic_rst_reg,

				   MTK_PMIC_PWRKEY_RST,

				   0);

		regmap_update_bits(keys->regmap, pmic_rst_reg,

				   MTK_PMIC_HOMEKEY_RST,

				   0);

		break;

	default:

		break;

	}

}



static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)

{

	struct mtk_pmic_keys_info *info = data;

	u32 key_deb, pressed;



	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);



	dev_dbg(info->keys->dev, "(%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_err(keys->dev, "Failed to request IRQ: %d: %d\n",

			info->irq, 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,

	}, {

		/* 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 mt6397_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);



	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;



	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;



		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)

			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->pmic_rst_reg);



	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");