HID: multitouch: Add ELAN production request when resume.

Add ELAN production request when resume.

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.

Suggested by Benjamin Tissoires <benjamin.tissoires@enac.fr>

Signed-off-by: Scott Liu <scott.liu@emc.com.tw>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 4a8048d3e9dd4a875a08178bbe1bfc4aecdf9f14..e170112e2b84f8ccbeedd7ce14a7d380e7d6051a 100644 (file)
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -765,6 +765,32 @@ 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)
@@ -1102,6 +1128,7 @@ static struct hid_driver mt_driver = {
        .event = mt_event,
 #ifdef CONFIG_PM
        .reset_resume = mt_reset_resume,
+       .resume = mt_resume,
 #endif
 };