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authorDavid Herrmann <dh.herrmann@googlemail.com>2012-07-20 11:49:09 +0200
committerJiri Kosina <jkosina@suse.cz>2012-07-20 14:32:00 +0200
commit4bc19f62c57b8ccdd1c48e875752bd59abfb7aae (patch)
treef33e717433f165fc7d69b5a71ba726c7f6ef859b /drivers/hid
parentff9bf5a2eff6e726406bcc097e8a578822d38859 (diff)
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>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-core.c6
-rw-r--r--drivers/hid/hid-picolcd.c4
2 files changed, 4 insertions, 6 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index ba1c3644e6ac..de8220c3fb5f 100644
--- 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 45c3433f7986..74c388dcb5b2 100644
--- 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;