linux-kernel - Re: [PATCH v4 1/1] input: add driver for Bosch Sensortec's BMA150 accelerometer

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Date:	Thu, 21 Jul 2011 10:56:56 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Eric Andersson <eric.andersson@...xphere.com>
Cc:	dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, zhengguang.guo@...ch-sensortec.com,
	stefan.nilsson@...xphere.com,
	Albert Zhang <xu.zhang@...ch-sensortec.com>
Subject: Re: [PATCH v4 1/1] input: add driver for Bosch Sensortec's BMA150
 accelerometer

Only detail thing I see is this trivial one:

> +static int bma150_open(struct bma150_data *bma150)
> +{
> +	int ret = bma150_set_mode(bma150->client, BMA150_MODE_NORMAL);
> +	msleep(2);
> +	return ret;

Does the msleep here need to be inside the mutex lock for the IRQ
case ?

Otherwise it looks good except that the lack of runtime pm means it'll
stop the rest of the bus heirarchy from suspending and breaks
suspend/resume on runtime_pm based systems. I think we still need runtime
pm taking the pm reference on the input open dropping it on the close and
that's about it ? That will be sufficient to let the i2c bus controller
also runtime suspend/resume.

Not so sure about the sysfs drop - but I think its probably the right
thing for upstream and any long term 'we need a fancy driver' would be
via IIO which would sort all the interface problems.

Alan
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