[PATCH 1/3] HID: Add HID_CLAIMED_OTHER for non-generic drivers

[David Herrmann <dh.herrmann@xxxxxxxxxxxxxx>]

All normal devices that correctly conform to the HID specs are handled by
the hid-input driver. However, for non-standard drivers we often don't
want hid-input to handle them but rather use specific hid drivers. But
hid_connect() requires at least one generic driver to claim the devices.
As hid_hw_start() calls hid_connect() we currently use an ugly workaround
by adding HID_CLAIMED_INPUT to hid->claimed and clear it after
hid_hw_start() again (see hid-picolcd.c for examples).

This adds the HID_CLAIMED_OTHER flag which can be set by device drivers to
tell the hid-core that they handle the device without the need of any
generic driver like hidinput, hiddev or hidraw.

Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxxxxxxx>
---
 drivers/hid/hid-core.c | 2 ++
 include/linux/hid.h    | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 9cdc74e..2039f32 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1391,6 +1391,8 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
 	if (hdev->claimed & HID_CLAIMED_HIDRAW)
 		len += sprintf(buf + len, "%shidraw%d", len ? "," : "",
 				((struct hidraw *)hdev->hidraw)->minor);
+	if (hdev->claimed & HID_CLAIMED_OTHER)
+		len += sprintf(buf + len, "%sother", len ? "," : "");
 
 	type = "Device";
 	for (i = 0; i < hdev->maxcollection; i++) {
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 449fa38..26b336a 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -452,6 +452,7 @@ struct hid_output_fifo {
 #define HID_CLAIMED_INPUT	1
 #define HID_CLAIMED_HIDDEV	2
 #define HID_CLAIMED_HIDRAW	4
+#define HID_CLAIMED_OTHER	8
 
 #define HID_STAT_ADDED		1
 #define HID_STAT_PARSED		2
-- 
1.7.11.2

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