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    Subject[PATCH v3 4/5] input: Add MediaTek PMIC keys support
    Date
    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: Chen Zhong <chen.zhong@mediatek.com>
    ---
    drivers/input/keyboard/Kconfig | 9 +
    drivers/input/keyboard/Makefile | 1 +
    drivers/input/keyboard/mtk-pmic-keys.c | 308 ++++++++++++++++++++++++++++++++
    3 files changed, 318 insertions(+)
    create mode 100644 drivers/input/keyboard/mtk-pmic-keys.c

    diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
    index 4c4ab1c..bd4e20a 100644
    --- a/drivers/input/keyboard/Kconfig
    +++ b/drivers/input/keyboard/Kconfig
    @@ -756,4 +756,13 @@ 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
    diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
    index d2338ba..20c0b98 100644
    --- a/drivers/input/keyboard/Makefile
    +++ b/drivers/input/keyboard/Makefile
    @@ -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
    diff --git a/drivers/input/keyboard/mtk-pmic-keys.c b/drivers/input/keyboard/mtk-pmic-keys.c
    new file mode 100644
    index 0000000..40518ce
    --- /dev/null
    +++ b/drivers/input/keyboard/mtk-pmic-keys.c
    @@ -0,0 +1,308 @@
    +/*
    + * 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 PWRKEY_RST_EN_MASK 0x1
    +#define PWRKEY_RST_EN_SHIFT 6
    +#define HOMEKEY_RST_EN_MASK 0x1
    +#define HOMEKEY_RST_EN_SHIFT 5
    +#define RST_DU_MASK 0x3
    +#define RST_DU_SHIFT 8
    +
    +#define PMIC_PWRKEY_INDEX 0
    +#define PMIC_HOMEKEY_INDEX 1
    +#define PMIC_MAX_KEY_COUNT 2
    +
    +struct pmic_keys_regs {
    + u32 deb_reg;
    + u32 deb_mask;
    + u32 intsel_reg;
    + u32 intsel_mask;
    +};
    +
    +#define 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 pmic_regs {
    + const struct pmic_keys_regs keys_regs[PMIC_MAX_KEY_COUNT];
    + u32 pmic_rst_reg;
    +};
    +
    +static const struct pmic_regs mt6397_regs = {
    + .keys_regs[PMIC_PWRKEY_INDEX] = PMIC_KEYS_REGS(MT6397_CHRSTATUS,
    + 0x8, MT6397_INT_RSV, 0x10),
    + .keys_regs[PMIC_HOMEKEY_INDEX] = PMIC_KEYS_REGS(MT6397_OCSTATUS2,
    + 0x10, MT6397_INT_RSV, 0x8),
    + .pmic_rst_reg = MT6397_TOP_RST_MISC,
    +};
    +
    +static const struct pmic_regs mt6323_regs = {
    + .keys_regs[PMIC_PWRKEY_INDEX] = PMIC_KEYS_REGS(MT6323_CHRSTATUS,
    + 0x2, MT6323_INT_MISC_CON, 0x10),
    + .keys_regs[PMIC_HOMEKEY_INDEX] = PMIC_KEYS_REGS(MT6323_CHRSTATUS,
    + 0x4, MT6323_INT_MISC_CON, 0x8),
    + .pmic_rst_reg = MT6323_TOP_RST_MISC,
    +};
    +
    +struct pmic_keys_info {
    + struct mtk_pmic_keys *keys;
    + const struct 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 pmic_keys_info keys[PMIC_MAX_KEY_COUNT];
    +};
    +
    +enum long_press_mode {
    + LP_DISABLE,
    + LP_ONEKEY,
    + LP_TWOKEY,
    +};
    +
    +static void long_press_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,
    + "debounce-interval", &long_press_debounce);
    + if (ret)
    + long_press_debounce = 0;
    +
    + regmap_update_bits(keys->regmap, pmic_rst_reg,
    + RST_DU_MASK << RST_DU_SHIFT,
    + long_press_debounce << 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_EN_MASK << PWRKEY_RST_EN_SHIFT,
    + PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT);
    + regmap_update_bits(keys->regmap, pmic_rst_reg,
    + HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT,
    + 0);
    + break;
    + case LP_TWOKEY:
    + regmap_update_bits(keys->regmap, pmic_rst_reg,
    + PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT,
    + PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT);
    + regmap_update_bits(keys->regmap, pmic_rst_reg,
    + HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT,
    + HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT);
    + break;
    + case LP_DISABLE:
    + regmap_update_bits(keys->regmap, pmic_rst_reg,
    + PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT,
    + 0);
    + regmap_update_bits(keys->regmap, pmic_rst_reg,
    + HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT,
    + 0);
    + break;
    + default:
    + break;
    + }
    +}
    +
    +static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
    +{
    + struct 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 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;
    + }
    +
    + if (info->wakeup)
    + irq_set_irq_wake(info->irq, 1);
    +
    + input_set_capability(keys->input_dev, EV_KEY, info->keycode);
    +
    + return 0;
    +}
    +
    +static const struct of_device_id of_pmic_keys_match_tbl[] = {
    + {
    + .compatible = "mediatek,mt6397-keys",
    + .data = &mt6397_regs,
    + }, {
    + .compatible = "mediatek,mt6323-keys",
    + .data = &mt6323_regs,
    + }, {
    + /* sentinel */
    + }
    +};
    +MODULE_DEVICE_TABLE(of, of_pmic_keys_match_tbl);
    +
    +static int mtk_pmic_keys_probe(struct platform_device *pdev)
    +{
    + int error, index = 0;
    + unsigned int keycount;
    + unsigned int keycodes[PMIC_MAX_KEY_COUNT];
    + unsigned int wakeup_srcs[PMIC_MAX_KEY_COUNT];
    + struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
    + struct mtk_pmic_keys *keys;
    + const struct pmic_regs *pmic_regs;
    + struct input_dev *input_dev;
    + const struct of_device_id *of_id =
    + of_match_device(of_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;
    + 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 = device_property_read_u32_array(keys->dev, "linux,keycodes",
    + NULL, 0);
    + if (keycount > PMIC_MAX_KEY_COUNT) {
    + dev_err(keys->dev, "too many keys defined (%d)\n", keycount);
    + return -EINVAL;
    + }
    +
    + error = device_property_read_u32_array(keys->dev, "linux,keycodes",
    + keycodes, keycount);
    + if (error) {
    + dev_err(keys->dev,
    + "failed to read linux,keycode property: %d\n", error);
    + return error;
    + }
    +
    + error = device_property_read_u32_array(keys->dev, "wakeup-source",
    + wakeup_srcs, keycount);
    + if (error) {
    + dev_err(keys->dev,
    + "failed to read wakeup-source property: %d\n", error);
    + return error;
    + }
    +
    + for (index = 0; index < keycount; index++) {
    + keys->keys[index].regs = &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;
    +
    + keys->keys[index].keycode = keycodes[index];
    +
    + if (wakeup_srcs[index])
    + keys->keys[index].wakeup = true;
    +
    + error = mtk_pmic_key_setup(keys, &keys->keys[index]);
    + if (error)
    + return error;
    + }
    +
    + error = input_register_device(input_dev);
    + if (error) {
    + dev_err(&pdev->dev,
    + "register input device failed (%d)\n", error);
    + return error;
    + }
    +
    + long_press_reset_setup(keys, pmic_regs->pmic_rst_reg);
    +
    + return 0;
    +}
    +
    +static struct platform_driver pmic_keys_pdrv = {
    + .probe = mtk_pmic_keys_probe,
    + .driver = {
    + .name = "mtk-pmic-keys",
    + .of_match_table = of_pmic_keys_match_tbl,
    + },
    +};
    +
    +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");
    --
    1.7.9.5
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      Last update: 2017-08-25 08:33    [W:3.770 / U:0.056 seconds]
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