input: Add MediaTek PMIC keys support (3e9f0b3e) · Commits · 戴 / test

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");

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