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

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Message-ID: <alpine.LNX.2.00.1003291144350.24576@pobox.suse.cz>
Date:	Mon, 29 Mar 2010 11:47:27 +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 Sat, 27 Mar 2010, Bruno Prémont wrote:

> +#ifdef CONFIG_PM
> +static int picolcd_suspend(struct hid_device *hdev)
> +{
> +	dbg_hid(PICOLCD_NAME " device ready for suspend\n");
> +	return 0;
> +}
> +
> +static int picolcd_resume(struct hid_device *hdev)
> +{
> +	return 0;
> +}
> +
> +static int picolcd_reset_resume(struct hid_device *hdev)
> +{
> +	int ret;
> +	ret = picolcd_reset(hdev);
> +	if (ret)
> +		dbg_hid(PICOLCD_NAME " resetting our device failed: %d\n", ret);
> +	return 0;
> +}
> +#endif
[ ... ]
> +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.

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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