linux-kernel - Re: [PATCH v3 1/1] HID:hid-multitouch: Add ELAN production request when resume.

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Date:	Wed, 15 Aug 2012 10:40:44 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Scott Liu <scott.liu@....com.tw>
Cc:	"benjamin.tissoires" <benjamin.tissoires@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	eleghost@...il.com
Subject: Re: [PATCH v3 1/1] HID:hid-multitouch: Add ELAN production request
 when resume.

On Tue, 14 Aug 2012, Scott Liu wrote:

> Add ELAN production request when resume

It would be nice to have some more explanation in the changelog (some 
variation of the comment in mt_resume() just before usb_control_msg() is 
issued should be sufficient).

Thanks.

> 
> Signed-off-by: Scott Liu <scott.liu@....com.tw>
> Suggested-off-by: Benjamin Tissoires <benjamin.tissoires@...c.fr>
> ---
>  drivers/hid/hid-multitouch.c |   27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 59c8b5c..e824c37 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -767,6 +767,32 @@ static int mt_reset_resume(struct hid_device *hdev)
>  	mt_set_input_mode(hdev);
>  	return 0;
>  }
> +
> +static int mt_resume(struct hid_device *hdev)
> +{
> +	struct usb_interface *intf;
> +	struct usb_host_interface *interface;
> +	struct usb_device *dev;
> +
> +	if (hdev->bus != BUS_USB)
> +		return 0;
> +
> +	intf = to_usb_interface(hdev->dev.parent);
> +	interface = intf->cur_altsetting;
> +	dev = hid_to_usb_dev(hdev);
> +
> +	/* Some Elan legacy devices require SET_IDLE to be set on resume.
> +	 * It should be safe to send it to other devices too.
> +	 * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
> +
> +	usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
> +			HID_REQ_SET_IDLE,
> +			USB_TYPE_CLASS | USB_RECIP_INTERFACE,
> +			0, interface->desc.bInterfaceNumber,
> +			NULL, 0, USB_CTRL_SET_TIMEOUT);
> +
> +	return 0;
> +}
>  #endif
>  
>  static void mt_remove(struct hid_device *hdev)
> @@ -1092,6 +1118,7 @@ static struct hid_driver mt_driver = {
>  	.event = mt_event,
>  #ifdef CONFIG_PM
>  	.reset_resume = mt_reset_resume,
> +	.resume = mt_resume,
>  #endif
>  };
>  
> -- 
> 1.7.9.5
> 

-- 
Jiri Kosina
SUSE Labs
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