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HID: wacom: Fail probe if HID_GENERIC device has unknown device_type

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The last patch was careful to maintain backwards-compatible behavior
by forcing device_type to BTN_TOOL_PEN (and printing a warning) if it
were still uninitialized after scanning the HID descriptor and applying
quirks. We should be more strict with HID_GENERIC devices, however,
since there is no a priori guarantee that it is a tablet or touchpad.
If the device_type is still uninitialized for a HID_GENERIC device then
we assume that it isn't something the driver can work with and so fail
the probe.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <pingc@wacom.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jason Gerecke 2015-04-30 17:51:55 -07:00 committed by Jiri Kosina
parent 042628abd5
commit 8e116d3169
1 changed files with 7 additions and 1 deletions
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8
drivers/hid/wacom_sys.c
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@ -1528,8 +1528,14 @@ static int wacom_probe(struct hid_device *hdev,
wacom_setup_device_quirks(wacom);
if (!features->device_type && features->type != WIRELESS) {
error = features->type == HID_GENERIC ? -ENODEV : 0;
dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
hdev->name, "Assuming pen");
hdev->name,
error ? "Ignoring" : "Assuming pen");
if (error)
goto fail_shared_data;
features->device_type = BTN_TOOL_PEN;
}