HID: Allow drivers to be their own listener

hid-picolcd and hid-wiimote do not allow any of hidinput, hiddev or hidraw
to claim the device but still want to remain on the bus. Hence, if a
driver uses the raw_event callback but no other listener claimed the
device, we still leave it on the bus as the driver handles everything by
itself. It thus becomes its own listener.

Under some circumstances (eg., hidinput_connect() fails and raw_event set)
a device may be left on the bus even though it requires external
listeners. But then if hidinput_connect() fails there are bigger issues
than a device that is left unhandled. So we can safely use this heuristic
to avoid adding another flag for special devices like hid-picolcd and
hid-wiimote.

This also removes the ugly hack from hid-picolcd as this is no longer
required.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index ba1c3644e6ac9b748df3159df7444894b51cce8b..de8220c3fb5f83b2d2ff25dae0a709cd763d4344 100644 (file)
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1373,8 +1373,10 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
        if ((connect_mask & HID_CONNECT_HIDRAW) && !hidraw_connect(hdev))
                hdev->claimed |= HID_CLAIMED_HIDRAW;
 
-       if (!hdev->claimed) {
-               hid_err(hdev, "claimed by neither input, hiddev nor hidraw\n");
+       /* Drivers with the ->raw_event callback set are not required to connect
+        * to any other listener. */
+       if (!hdev->claimed && !hdev->driver->raw_event) {
+               hid_err(hdev, "device has no listeners, quitting\n");
                return -ENODEV;
        }
 

diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c
index 45c3433f798699ec6749cee885a2b78d490e2b21..74c388dcb5b293e28fe6a6428c0a706b5e0e4c95 100644 (file)
--- a/drivers/hid/hid-picolcd.c
+++ b/drivers/hid/hid-picolcd.c
@@ -2613,11 +2613,7 @@ static int picolcd_probe(struct hid_device *hdev,
                goto err_cleanup_data;
        }
 
-       /* We don't use hidinput but hid_hw_start() fails if nothing is
-        * claimed. So spoof claimed input. */
-       hdev->claimed = HID_CLAIMED_INPUT;
        error = hid_hw_start(hdev, 0);
-       hdev->claimed = 0;
        if (error) {
                hid_err(hdev, "hardware start failed\n");
                goto err_cleanup_data;