linux-kernel - Re: [PATCH v4 1/6] hid: new driver for PicoLCD device

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Message-ID: <alpine.LNX.2.00.1003301010410.24576@pobox.suse.cz>
Date:	Tue, 30 Mar 2010 10:12:05 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>,
	Nicu Pavel <npavel@...ner.com>,
	Oliver Neukum <oliver@...kum.org>,
	Jaya Kumar <jayakumar.lkml@...il.com>
Subject: Re: [PATCH v4 1/6] hid: new driver for PicoLCD device

On Mon, 29 Mar 2010, Bruno Prémont wrote:

> > > +static struct hid_driver picolcd_driver = {
> > > +	.name =          "hid-picolcd",
> > > +	.id_table =      picolcd_devices,
> > > +	.probe =         picolcd_probe,
> > > +	.remove =        picolcd_remove,
> > > +	.raw_event =     picolcd_raw_event,
> > > +#ifdef CONFIG_PM
> > > +	.suspend =       picolcd_suspend,
> > > +	.resume =        picolcd_resume,
> > > +	.reset_resume =  picolcd_reset_resume,
> > > +#endif
> > > +};
> > 
> > struct hid_driver doesn't provide power-management related callbacks.
> > So I guess that you have either not tested this feature at all, or
> > you have some extra patch somewhere which adds such callbacks to HID
> > core, but you haven't sent it out for review?
> > 
> > In any cases, this will very likely cause compilation failure with 
> > CONFIG_PM turned on.
> 
> That's the patch I referred to (under series introduction mail) when
> saying:
> > The series depends on my previous patch adding HID suspend support
> > (I've not yet looked at improving it).
> 
> Link to the patch:
>   http://lkml.org/lkml/2010/2/24/233
> 
> Especially the reset-resume part is important as the device has to be
> reprogrammed with framebuffer content, brightness/contrast in that case.
> 
> As stated, Oliver didn't like the implementation of the addition of
> those hooks too much and I have yet to look at improving it.

Ah, OK, I have missed that one, thanks for pointing it out.

The driver itself now looks fine to me and I am willing to merge it, 
modulo the power-management code -- so please either remove the parts that 
depend on power management for now, or I'll wait on your respin of the 
generic HID-PM patch.

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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