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

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Date:   Wed, 8 Jun 2022 09:05:16 +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 08/06/2022 09:03, Krzysztof Kozlowski wrote:
> 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.

Hm, it seems it is coming from the parent device, dynamically, so looks ok.


Best regards,
Krzysztof