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

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Date:	Sun, 7 Aug 2011 22:15:04 -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,
	xu.zhang@...ch-sensortec.com
Subject: Re: [PATCH v6 1/1] input: add driver for Bosch Sensortec's BMA150
 accelerometer

On Sun, Aug 07, 2011 at 06:23:25PM +0200, Eric Andersson wrote:
> > On Sun, Jul 31, 2011 at 12:49:17AM +0200, Dmitry Torokhov 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).
> > >
> > > If I call pm_runtime_enable() I cannot use pm_runtime_set_active() later
> > > according to the comment in __pm_runtime_set_status (runtime.c):
> > > "If runtime PM of the device is disabled or its power.runtime_error
> > > field is different from zero, the status may be changed either to
> > > RPM_ACTIVE, or to RPM_SUSPENDED..."
> > >
> > > If the PM of the device is enabled it will return -EAGAIN. Of course, we
> > > could enable() in probe, then disable(); set_active(); enable(); in
> > > open, but that seems a bit confused, right?
> > 
> > Hmm, indeed. I do not like the idea about disable/set_active/enable so I
> > guess we'll have to keep track of the current mode themselves and call
> > bma150_set_mode() ourselves if, after calling pm_runtime_get/put_sync()
> > we find that our mode is different from what we expect it to be.
> > 
> > I also noticed that you did not properly free IRQ on device removal and
> > also polled devices need to be freed always (unlike regular input
> > devices that should be only unregistered). The default_cfg can't be
> > __initdata because it is used by __devinit functions. And my version of
> > GCC can't figure out that ipoll_dev never used uninitialized and gives
> > false warning.
> > 
> > I tried correcting these issues in the patch below, along with renaming
> > 'ret' to 'error' which I prefer when we dealing with error handling.
> > Could you please git it a try and if everything still works I'll fold it
> > and commit.
> 
> Thanks Dmitry! I tried your patch and it worked like a charm!

Excellent, thanks for testing.

> 
> Do you take it from here or would you like me to send an updated
> version that includes your patch?

No, there is no need for that. I'll fold them all together and queue for
2.6.32.

I take the other patch that makes polled devices do poll upon opening
working well for you too.. Should I queue for .2 as well?

Thanks.

-- 
Dmitry
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