linux-kernel - Re: [PATCH 1/2] input: gpio-keys: Disable hardware on suspend

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Date:	Fri, 12 Oct 2012 23:17:39 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, linus.walleij@...ricsson.com,
	Jonas Aaberg <jonas.aberg@...ricsson.com>,
	linux-input@...r.kernel.org,
	Philippe Langlais <philippe.langlais@...aro.org>
Subject: Re: [PATCH 1/2] input: gpio-keys: Disable hardware on suspend

Hi Lee,

On Thu, Oct 11, 2012 at 03:15:26PM +0100, Lee Jones wrote:
> From: Jonas Aaberg <jonas.aberg@...ricsson.com>
> 
> Disable hardware if active when suspending if the hw can not
> wake the system from suspend.
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: linux-input@...r.kernel.org
> Acked-by: Lee Jones <lee.jones@...aro.org>

If you are sending the patch then it should be signed-off-by, not
acked-by, and it should be the very last entry.

> Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
> Signed-off-by: Philippe Langlais <philippe.langlais@...aro.org>
> Reviewed-by: Bengt Jonsson <bengt.g.jonsson@...ricsson.com>
> ---
>  drivers/input/keyboard/gpio_keys.c |   13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
> index cbb1add..7947315 100644
> --- a/drivers/input/keyboard/gpio_keys.c
> +++ b/drivers/input/keyboard/gpio_keys.c
> @@ -46,6 +46,8 @@ struct gpio_keys_drvdata {
>  	struct input_dev *input;
>  	struct mutex disable_lock;
>  	unsigned int n_buttons;
> +	bool enabled;
> +	bool enable_after_suspend;
>  	int (*enable)(struct device *dev);
>  	void (*disable)(struct device *dev);
>  	struct gpio_button_data data[0];
> @@ -524,6 +526,7 @@ static int gpio_keys_open(struct input_dev *input)
>  {
>  	struct gpio_keys_drvdata *ddata = input_get_drvdata(input);
>  
> +	ddata->enabled = true;
>  	return ddata->enable ? ddata->enable(input->dev.parent) : 0;
>  }
>  
> @@ -533,6 +536,7 @@ static void gpio_keys_close(struct input_dev *input)
>  
>  	if (ddata->disable)
>  		ddata->disable(input->dev.parent);
> +	ddata->enabled = false;
>  }
>  
>  /*
> @@ -674,6 +678,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
>  	ddata->n_buttons = pdata->nbuttons;
>  	ddata->enable = pdata->enable;
>  	ddata->disable = pdata->disable;
> +	ddata->enabled = false;
>  	mutex_init(&ddata->disable_lock);
>  
>  	platform_set_drvdata(pdev, ddata);
> @@ -789,6 +794,10 @@ static int gpio_keys_suspend(struct device *dev)
>  			if (bdata->button->wakeup)
>  				enable_irq_wake(bdata->irq);
>  		}
> +	} else {
> +		ddata->enable_after_suspend = ddata->enabled;
> +		if (ddata->enabled)
> +			gpio_keys_close(ddata->input);

I think it should take ddata->input->mutex to avoid races with
open/close and use ddata->input->users to figure out if device shoudl be
closed and re-opened later.

Thanks.

>  	}
>  
>  	return 0;
> @@ -807,6 +816,10 @@ static int gpio_keys_resume(struct device *dev)
>  		if (gpio_is_valid(bdata->button->gpio))
>  			gpio_keys_gpio_report_event(bdata);
>  	}
> +
> +	if (!device_may_wakeup(dev) && ddata->enable_after_suspend)
> +		gpio_keys_open(ddata->input);
> +
>  	input_sync(ddata->input);
>  
>  	return 0;
> -- 
> 1.7.9.5
> 

-- 
Dmitry
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