linux-kernel - Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

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Date:	Sat, 30 Jul 2011 12:17:26 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Eric Andersson <eric.andersson@...xphere.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	zhengguang.guo@...ch-sensortec.com, stefan.nilsson@...xphere.com,
	alan@...rguk.ukuu.org.uk, jic23@....ac.uk,
	Albert Zhang <xu.zhang@...ch-sensortec.com>
Subject: Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150
 accelerometer

Hi Eric,

On Wed, Jul 27, 2011 at 10:53:47PM +0200, Eric Andersson wrote:
> +
> +static int bma150_open(struct bma150_data *bma150)
> +{
> +	int ret;
> +
> +	ret = pm_runtime_set_active(&bma150->client->dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	pm_runtime_enable(&bma150->client->dev);

I am pretty sure you want to call pm_runtime_enable() in bma150_probe()
so that parent controller can be suspended until somebody calls
bma150_open() and we mark the device as active (which, in turn, should
wake up its parent).

> +
> +	return bma150_set_mode(bma150->client, BMA150_MODE_NORMAL);
> +}
> +
> +static void bma150_close(struct bma150_data *bma150)
> +{
> +	pm_runtime_disable(&bma150->client->dev);

And disable should go into bma150_remove() unless I misunderstand
runtime PM framework.

> +	pm_runtime_set_suspended(&bma150->client->dev);
> +	bma150_set_mode(bma150->client, BMA150_MODE_SLEEP);

I think you want to call bma150_set_mode() first and then mark device as
suspended so that parent can go to sleep as well.

Thanks.

-- 
Dmitry
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