linux-kernel - Re: [PATCH] Input: tsc2004/5 - do not use irq_set_irq

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Date:   Mon, 13 Feb 2017 07:17:54 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, Pavel Machek <pavel@....cz>,
        Pali Rohár <pali.rohar@...il.com>,
        Michael Welling <mwelling@...e.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: tsc2004/5 - do not use irq_set_irq_wake() directly

Hi,

On Sun, Feb 12, 2017 at 03:43:33PM -0800, Dmitry Torokhov wrote:
> Instead of setting irq_set_irq_wake() directly in probe(), mark the device
> as wakeup-capable, and use enable_irq_wake() and disable_irq_wake() in
> suspend/resume path.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

Reviewed-By: Sebastian Reichel <sre@...nel.org>

I suggest to add a paragraph in the patch description, why the
change was done. E.g.:

This adds support for changing the wakeup setting dynamically at
runtime using /sys/devices/.../tsc2005/power/wakeup.

Also I wonder if the default should be 'off' (by using
device_set_wakeup_capable() instead of device_init_wakeup()

-- Sebastian

>  drivers/input/touchscreen/tsc200x-core.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/touchscreen/tsc200x-core.c b/drivers/input/touchscreen/tsc200x-core.c
> index 88ea5e1b72ae..d1c40c803d61 100644
> --- a/drivers/input/touchscreen/tsc200x-core.c
> +++ b/drivers/input/touchscreen/tsc200x-core.c
> @@ -114,7 +114,9 @@ struct tsc200x {
>  
>  	struct gpio_desc	*reset_gpio;
>  	int			(*tsc200x_cmd)(struct device *dev, u8 cmd);
> +
>  	int			irq;
> +	bool			wake_irq_enabled;
>  };
>  
>  static void tsc200x_update_pen_state(struct tsc200x *ts,
> @@ -573,7 +575,8 @@ int tsc200x_probe(struct device *dev, int irq, const struct input_id *tsc_id,
>  		goto err_remove_sysfs;
>  	}
>  
> -	irq_set_irq_wake(irq, 1);
> +	device_init_wakeup(dev, true);
> +
>  	return 0;
>  
>  err_remove_sysfs:
> @@ -607,6 +610,9 @@ static int __maybe_unused tsc200x_suspend(struct device *dev)
>  
>  	ts->suspended = true;
>  
> +	if (device_may_wakeup(dev))
> +		ts->wake_irq_enabled = enable_irq_wake(ts->irq) == 0;
> +
>  	mutex_unlock(&ts->mutex);
>  
>  	return 0;
> @@ -618,6 +624,11 @@ static int __maybe_unused tsc200x_resume(struct device *dev)
>  
>  	mutex_lock(&ts->mutex);
>  
> +	if (ts->wake_irq_enabled) {
> +		disable_irq_wake(ts->irq);
> +		ts->wake_irq_enabled = false;
> +	}
> +
>  	if (ts->suspended && ts->opened)
>  		__tsc200x_enable(ts);
>  
> -- 
> 2.11.0.483.g087da7b7c-goog
> 
> 
> -- 
> Dmitry

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