linux-kernel - Re: [PATCH] input: sun4i-lradc-keys: Add wakup support

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Date:   Mon, 28 Oct 2019 16:38:28 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Ondrej Jirman <megous@...ous.com>
Cc:     linux-sunxi@...glegroups.com, Hans de Goede <hdegoede@...hat.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        "open list:SUN4I LOW RES ADC ATTACHED TABLET KEYS DRIVER" 
        <linux-input@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] input: sun4i-lradc-keys: Add wakup support

Hi Ondrej,

On Mon, Oct 28, 2019 at 11:15:02PM +0100, Ondrej Jirman wrote:
> Allow the driver to wakeup the system on key press.
> 
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> ---
>  drivers/input/keyboard/sun4i-lradc-keys.c | 22 ++++++++++++++++++----
>  1 file changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyboard/sun4i-lradc-keys.c
> index 4a796bed48ac..bba679d7b54b 100644
> --- a/drivers/input/keyboard/sun4i-lradc-keys.c
> +++ b/drivers/input/keyboard/sun4i-lradc-keys.c
> @@ -22,6 +22,8 @@
>  #include <linux/module.h>
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_wakeirq.h>
> +#include <linux/pm_wakeup.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/slab.h>
>  
> @@ -226,8 +228,7 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
>  {
>  	struct sun4i_lradc_data *lradc;
>  	struct device *dev = &pdev->dev;
> -	int i;
> -	int error;
> +	int i, error, irq;
>  
>  	lradc = devm_kzalloc(dev, sizeof(struct sun4i_lradc_data), GFP_KERNEL);
>  	if (!lradc)
> @@ -272,8 +273,13 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
>  	if (IS_ERR(lradc->base))
>  		return PTR_ERR(lradc->base);
>  
> -	error = devm_request_irq(dev, platform_get_irq(pdev, 0),
> -				 sun4i_lradc_irq, 0,
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(&pdev->dev, "Failed to get IRQ\n");
> +		return irq;
> +	}
> +
> +	error = devm_request_irq(dev, irq, sun4i_lradc_irq, 0,
>  				 "sun4i-a10-lradc-keys", lradc);
>  	if (error)
>  		return error;
> @@ -282,6 +288,14 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
>  	if (error)
>  		return error;
>  
> +	device_init_wakeup(dev, true);

I do not think we want to do this unconditionally. Can we maybe key off
"wakeup-source" device property.

> +
> +	error = dev_pm_set_wake_irq(dev, irq);
> +	if (error) {
> +		dev_err(dev, "Could not set wake IRQ\n");
> +		return error;
> +	}
> +

I wonder if we could teach platform driver core to handle this for us.

Thanks.

-- 
Dmitry