Add support for inserting a Wacom pad device ID into hid-uclogic
reports. This allows reporting dial inputs in a way compatible with the
Wacom driver. Needed for Ugee G5 support in particular.
Signed-off-by: Nikolai Kondrashov <spbnick@xxxxxxxxx>
---
drivers/hid/hid-uclogic-core.c | 10 ++++++++++
drivers/hid/hid-uclogic-params.h | 9 +++++++++
2 files changed, 19 insertions(+)
diff --git a/drivers/hid/hid-uclogic-core.c b/drivers/hid/hid-uclogic-core.c
index e4324ad86e58..f5fb612daa1e 100644
--- a/drivers/hid/hid-uclogic-core.c
+++ b/drivers/hid/hid-uclogic-core.c
@@ -300,6 +300,16 @@ static int uclogic_raw_event(struct hid_device *hdev,
}
}
+ /* Tweak frame control reports, if necessary */
+ if ((report->type == HID_INPUT_REPORT) &&
+ (report->id == params->frame.id)) {
+ /* If need to, and can, set pad device ID for Wacom drivers */
+ if (params->frame.dev_id_byte > 0 &&
+ params->frame.dev_id_byte < size) {
+ data[params->frame.dev_id_byte] = 0xf;
+ }
+ }
+
return 0;
}
diff --git a/drivers/hid/hid-uclogic-params.h b/drivers/hid/hid-uclogic-params.h
index 1060f70d647d..4ba6ecc2b8b8 100644
--- a/drivers/hid/hid-uclogic-params.h
+++ b/drivers/hid/hid-uclogic-params.h
@@ -87,6 +87,13 @@ struct uclogic_params_frame {
* Report ID, if reports should be tweaked, zero if not.
*/
unsigned int id;
+ /*
+ * Offset of the Wacom-style device ID byte in the report, to be set
+ * to pad device ID (0xf), for compatibility with Wacom drivers. Zero
+ * if no changes to the report should be made. Only valid if "id" is
+ * not zero.
+ */
+ unsigned int dev_id_byte;
};
/*
@@ -161,6 +168,7 @@ extern int uclogic_params_init(struct uclogic_params *params,
".frame.desc_ptr = %p\n" \
".frame.desc_size = %u\n" \
".frame.id = %u\n" \
+ ".frame.dev_id_byte = %u\n" \
".pen_frame_flag = 0x%02x\n"
/* Tablet interface parameters *printf format arguments */
@@ -177,6 +185,7 @@ extern int uclogic_params_init(struct uclogic_params *params,
(_params)->frame.desc_ptr, \
(_params)->frame.desc_size, \
(_params)->frame.id, \
+ (_params)->frame.dev_id_byte, \
(_params)->pen_frame_flag
/* Get a replacement report descriptor for a tablet's interface. */
--
2.20.1
