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SubjectRe: [PATCH v2 4/5] input: Add MediaTek PMIC keys support
Hi Chen,

On Mon, Aug 07, 2017 at 09:57:44AM +0800, Chen Zhong wrote:
> 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 | 331 ++++++++++++++++++++++++++++++++
> 3 files changed, 341 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..730d9b5 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 (pwrkey/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..5d1f133
> --- /dev/null
> +++ b/drivers/input/keyboard/mtk-pmic-keys.c
> @@ -0,0 +1,331 @@
> +/*
> + * 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>
> +#include <linux/slab.h>
> +#include <linux/irqdomain.h>

Not needed.

> +
> +#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
> +
> +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 pwrkey_regs;
> + const struct pmic_keys_regs homekey_regs;
> + u32 pmic_rst_reg;
> +};
> +
> +static const struct pmic_regs mt6397_regs = {
> + .pwrkey_regs = PMIC_KEYS_REGS(MT6397_CHRSTATUS,
> + 0x8, MT6397_INT_RSV, 0x10),
> + .homekey_regs = PMIC_KEYS_REGS(MT6397_OCSTATUS2,
> + 0x10, MT6397_INT_RSV, 0x8),
> + .pmic_rst_reg = MT6397_TOP_RST_MISC,
> +};
> +
> +static const struct pmic_regs mt6323_regs = {
> + .pwrkey_regs = PMIC_KEYS_REGS(MT6323_CHRSTATUS,
> + 0x2, MT6323_INT_MISC_CON, 0x10),
> + .homekey_regs = 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;
> + int keycode;
> + int irq;
> +};
> +
> +struct mtk_pmic_keys {
> + struct input_dev *input_dev;
> + struct device *dev;
> + struct regmap *regmap;
> + struct irq_domain *irq_domain;

Not needed.

> + struct pmic_keys_info pwrkey, homekey;
> +};
> +
> +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_duration;
> +
> + ret = of_property_read_u32(keys->dev->of_node,
> + "mediatek,long-press-duration", &long_press_duration);
> + if (ret)
> + long_press_duration = 0;
> +
> + regmap_update_bits(keys->regmap, pmic_rst_reg,
> + RST_DU_MASK << RST_DU_SHIFT,
> + long_press_duration << 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, "[PMICKEYS] (%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,
> + const char *propname, struct pmic_keys_info *info, bool wakeup)
> +{
> + int ret;
> +
> + ret = of_property_read_u32(keys->dev->of_node,
> + propname, &info->keycode);
> + if (ret)
> + return 0;
> +
> + if (!info->keycode)
> + return 0;
> +
> + 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 (wakeup)
> + irq_set_irq_wake(info->irq, 1);
> +
> + input_set_capability(keys->input_dev, EV_KEY, info->keycode);
> +
> + return 0;
> +}
> +
> +static void mtk_pmic_keys_dispose_irq(struct mtk_pmic_keys *keys)
> +{
> + if (keys->pwrkey.irq)
> + irq_dispose_mapping(keys->pwrkey.irq);
> +
> + if (keys->homekey.irq)
> + irq_dispose_mapping(keys->homekey.irq);

You did not create the mapping, you should not destroy it.

> +}
> +
> +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 ret;
> + struct resource *res_pwrkey, *res_homekey;
> + 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;
> + keys->irq_domain = pmic_chip->irq_domain;

Not needed.

> +
> + pmic_regs = of_id->data;
> + keys->pwrkey.regs = &pmic_regs->pwrkey_regs;
> + keys->homekey.regs = &pmic_regs->homekey_regs;
> +
> + res_pwrkey = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> + if (!res_pwrkey) {
> + dev_err(&pdev->dev, "no IRQ resource\n");
> + return -ENODEV;
> + }
> +
> + keys->pwrkey.irq = res_pwrkey->start;
> + if (keys->pwrkey.irq <= 0)
> + return -EINVAL;

Please do

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

> +
> + res_homekey = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
> + if (!res_homekey) {
> + dev_err(&pdev->dev, "no IRQ resource\n");
> + return -ENODEV;
> + }
> +
> + keys->homekey.irq = res_homekey->start;
> + if (keys->homekey.irq <= 0)
> + return -EINVAL;

Same as above.

> +
> + keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
> + if (!input_dev) {
> + dev_err(&pdev->dev, "[PMICKEYS] 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;
> + input_dev->dev.parent = &pdev->dev;

Not needed, devm_input_allocate_device() already does this.

> +
> + ret = mtk_pmic_key_setup(keys, "mediatek,pwrkey-code",
> + &keys->pwrkey, true);
> + if (ret)
> + goto out_dispose_irq;

Can you please call this variable "error" and do

if (error)
return error;

You are using devm and no longer creating mappings, so you can return
directly and rely on devm infrastructure to unwind.

> +
> + ret = mtk_pmic_key_setup(keys, "mediatek,homekey-code",
> + &keys->homekey, false);
> + if (ret)
> + goto out_dispose_irq;
> +
> + ret = input_register_device(input_dev);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "[PMICKEYS] register input device failed (%d)\n", ret);

No need for [PMICKEYS] prefix, dev_err prints device and driver already.

> + return ret;
> + }
> +
> + long_press_reset_setup(keys, pmic_regs->pmic_rst_reg);
> +
> + return 0;
> +
> +out_dispose_irq:
> + mtk_pmic_keys_dispose_irq(keys);
> + return ret;
> +}
> +
> +static int mtk_pmic_keys_remove(struct platform_device *pdev)
> +{
> + struct mtk_pmic_keys *keys = platform_get_drvdata(pdev);
> +
> + mtk_pmic_keys_dispose_irq(keys);

Not needed. The whole function is not needed.

> +
> + return 0;
> +}
> +
> +static struct platform_driver pmic_keys_pdrv = {
> + .probe = mtk_pmic_keys_probe,
> + .remove = mtk_pmic_keys_remove,
> + .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
>

Thanks.

--
Dmitry

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