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@xxxxxxxxxx>
> Suggested-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxx>
> ---
> 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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