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HID: add autodetection of multitouch devices

Browse source 
As mentioned by http://www.microsoft.com/whdc/device/input/DigitizerDrvs_touch.mspx
multitouch devices are those that have the input report HID_CONTACTID.

This patch detects this and unloads the generic-usb driver.

Signed-off-by: Benjamin Tissoires <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Benjamin Tissoires 2011-09-21 16:56:54 +02:00 • committed by Jiri Kosina
commit b77c3920e9
3 changed files with 18 additions and 0 deletions
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6
drivers/hid/hid-core.c
View file

@ -1212,6 +1212,12 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
if ((connect_mask & HID_CONNECT_HIDINPUT) && !hidinput_connect(hdev,
connect_mask & HID_CONNECT_HIDINPUT_FORCE))
hdev->claimed |= HID_CLAIMED_INPUT;
if (hdev->quirks & HID_QUIRK_MULTITOUCH) {
/* this device should be handled by hid-multitouch, skip it */
hdev->quirks &= ~HID_QUIRK_MULTITOUCH;
return -ENODEV;
}
if ((connect_mask & HID_CONNECT_HIDDEV) && hdev->hiddev_connect &&
!hdev->hiddev_connect(hdev,
connect_mask & HID_CONNECT_HIDDEV_FORCE))

11
drivers/hid/hid-input.c
View file

@ -474,6 +474,10 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
map_key_clear(BTN_STYLUS2);
break;
case 0x51: /* ContactID */
device->quirks |= HID_QUIRK_MULTITOUCH;
goto unknown;
default: goto unknown;
}
break;
@ -978,6 +982,13 @@ int hidinput_connect(struct hid_device *hid, unsigned int force)
}
}
if (hid->quirks & HID_QUIRK_MULTITOUCH) {
/* generic hid does not know how to handle multitouch devices */
if (hidinput)
goto out_cleanup;
goto out_unwind;
}
if (hidinput && input_register_device(hidinput->input))
goto out_cleanup;