linux-kernel - Re: [PATCH 4/8] Input: twl6040-vibra: Check the selected path for vibra

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Date:	Thu, 15 Sep 2011 23:27:20 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Samuel Ortiz <samuel.ortiz@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org,
	Misael Lopez Cruz <misael.lopez@...com>,
	linux-input@...r.kernel.org
Subject: Re: [PATCH 4/8] Input: twl6040-vibra: Check the selected path for
 vibra

On Thu, Sep 15, 2011 at 03:59:17PM +0300, Peter Ujfalusi wrote:
> The VIBSELL/R bit in the VIBCTLL/R register tells the source of the data,
> which is going to be used to drive the attached motor(s).
> Do not allow effect execution if any of the channels are set to receive
> audio data.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
>  drivers/input/misc/twl6040-vibra.c |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/input/misc/twl6040-vibra.c b/drivers/input/misc/twl6040-vibra.c
> index cb74185..fe624f2 100644
> --- a/drivers/input/misc/twl6040-vibra.c
> +++ b/drivers/input/misc/twl6040-vibra.c
> @@ -201,6 +201,13 @@ static int vibra_play(struct input_dev *input, void *data,
>  	struct vibra_info *info = input_get_drvdata(input);
>  	int ret;
>  
> +	/* Do not allow effect, while the routing is set to use audio */
> +	ret = twl6040_get_vibralr_status(info->twl6040);
> +	if (ret & TWL6040_VIBSEL) {
> +		dev_info(&input->dev, "Vibra is configured for audio\n");
> +		return -EPERM;
> +	}
> +

This is not very helpful for the application trying to use the device.
Maybe we should zap the device when channels are routed through audio
instead of dripping requests?

Thanks.

-- 
Dmitry
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