linux-kernel - Re: [PATCH 4/4] input: misc: rt5120: Add power key support

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Message-ID: <b37a1a32-056e-cb25-f53a-3028a4d90ece@linaro.org>
Date:   Wed, 8 Jun 2022 09:03:40 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     cy_huang <u0084500@...il.com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, lee.jones@...aro.org,
        broonie@...nel.org, dmitry.torokhov@...il.com
Cc:     lgirdwood@...il.com, cy_huang@...htek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org
Subject: Re: [PATCH 4/4] input: misc: rt5120: Add power key support

On 07/06/2022 07:52, cy_huang wrote:
> From: ChiYuan Huang <cy_huang@...htek.com>
> 
> Add RT5120 PMIC power key support.
> 
> Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> ---
>  drivers/input/misc/Kconfig         |   9 +++
>  drivers/input/misc/Makefile        |   1 +
>  drivers/input/misc/rt5120-pwrkey.c | 115 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 125 insertions(+)
>  create mode 100644 drivers/input/misc/rt5120-pwrkey.c
> 
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index dd5227c..9c0d814 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -881,6 +881,15 @@ config INPUT_SC27XX_VIBRA
>  	  To compile this driver as a module, choose M here. The module will
>  	  be called sc27xx_vibra.
>  
> +config INPUT_RT5120_PWRKEY
> +	tristate "RT5120 PMIC power key support"
> +	depends on MFD_RT5120
> +	help
> +	  This enables support for RT5120 PMIC power key driver.
> +
> +	  To compile this driver as a module, choose M here. the module will
> +	  be called rt5120-pwerkey.
> +
>  config INPUT_STPMIC1_ONKEY
>  	tristate "STPMIC1 PMIC Onkey support"
>  	depends on MFD_STPMIC1
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index b92c53a..164ea20 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -68,6 +68,7 @@ obj-$(CONFIG_INPUT_RAVE_SP_PWRBUTTON)	+= rave-sp-pwrbutton.o
>  obj-$(CONFIG_INPUT_RB532_BUTTON)	+= rb532_button.o
>  obj-$(CONFIG_INPUT_REGULATOR_HAPTIC)	+= regulator-haptic.o
>  obj-$(CONFIG_INPUT_RETU_PWRBUTTON)	+= retu-pwrbutton.o
> +obj-$(CONFIG_INPUT_RT5120_PWRKEY)	+= rt5120-pwrkey.o
>  obj-$(CONFIG_INPUT_AXP20X_PEK)		+= axp20x-pek.o
>  obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER)	+= rotary_encoder.o
>  obj-$(CONFIG_INPUT_RK805_PWRKEY)	+= rk805-pwrkey.o
> diff --git a/drivers/input/misc/rt5120-pwrkey.c b/drivers/input/misc/rt5120-pwrkey.c
> new file mode 100644
> index 00000000..42bd2f3
> --- /dev/null
> +++ b/drivers/input/misc/rt5120-pwrkey.c
> @@ -0,0 +1,115 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +#include <linux/bits.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#define RT5120_REG_INTSTAT	0x1E
> +#define RT5120_PWRKEYSTAT_MASK	BIT(7)
> +
> +struct rt5120_priv {
> +	struct regmap *regmap;
> +	struct input_dev *input;
> +	int press_irq;
> +	int release_irq;
> +};
> +
> +static irqreturn_t rt5120_pwrkey_handler(int irq, void *devid)
> +{
> +	struct rt5120_priv *priv = devid;
> +	unsigned int stat;
> +	bool is_pressed;
> +	int ret;
> +
> +	ret = regmap_read(priv->regmap, RT5120_REG_INTSTAT, &stat);
> +	if (ret)
> +		return IRQ_NONE;
> +
> +	is_pressed = !(stat & RT5120_PWRKEYSTAT_MASK);
> +
> +	if ((is_pressed && irq == priv->press_irq) ||
> +	    (!is_pressed  && irq == priv->release_irq)) {
> +		input_report_key(priv->input, KEY_POWER, is_pressed);
> +		input_sync(priv->input);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int rt5120_pwrkey_probe(struct platform_device *pdev)
> +{
> +	struct rt5120_priv *priv;
> +	int ret;
> +
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!priv->regmap) {
> +		dev_err(&pdev->dev, "Failed to init regmap\n");
> +		return -ENODEV;
> +	}
> +
> +	priv->press_irq = platform_get_irq_byname(pdev, "pwrkey-press");
> +	if (priv->press_irq < 0)
> +		return priv->press_irq;
> +
> +	priv->release_irq = platform_get_irq_byname(pdev, "pwrkey-release");
> +	if (priv->release_irq < 0)
> +		return priv->release_irq;

Not described in the bindings. All properties need to be documented.


Best regards,
Krzysztof