linux-kernel - [PATCH v3 1/2] HID: uclogic: Refactor UGEEv2 probe magic data

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Message-Id: <20230204192051.1287369-2-josh@redstrate.com>
Date:   Sat,  4 Feb 2023 14:20:50 -0500
From:   Joshua Goins <josh@...strate.com>
To:     linux-input@...r.kernel.org
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-kernel@...r.kernel.org,
        José Expósito <jose.exposito89@...il.com>,
        Mia Kanashi <chad@...pilled.dev>,
        Andreas Grosse <andig.mail@...nline.de>,
        Joshua Goins <josh@...strate.com>
Subject: [PATCH v3 1/2] HID: uclogic: Refactor UGEEv2 probe magic data

From: José Expósito <jose.exposito89@...il.com>

A fututure patch will need to use the array of magic data that the
UGEEv2 devices expect on probe and the endpoint number. Move them to a
common place.

Refactor, no functional changes.

Tested-by: Mia Kanashi <chad@...pilled.dev>
Tested-by: Andreas Grosse <andig.mail@...nline.de>
Signed-off-by: José Expósito <jose.exposito89@...il.com>
Signed-off-by: Joshua Goins <josh@...strate.com>
---
 drivers/hid/hid-uclogic-params.c | 11 +++++------
 drivers/hid/hid-uclogic-rdesc.c  |  6 ++++++
 drivers/hid/hid-uclogic-rdesc.h  |  5 +++++
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
index 3c5eea3df328..d68cb99a03de 100644
--- a/drivers/hid/hid-uclogic-params.c
+++ b/drivers/hid/hid-uclogic-params.c
@@ -1021,8 +1021,8 @@ static int uclogic_params_huion_init(struct uclogic_params *params,
  * Returns:
  *	Zero, if successful. A negative errno code on error.
  */
-static int uclogic_probe_interface(struct hid_device *hdev, u8 *magic_arr,
-				   int magic_size, int endpoint)
+static int uclogic_probe_interface(struct hid_device *hdev, const u8 *magic_arr,
+				   size_t magic_size, int endpoint)
 {
 	struct usb_device *udev;
 	unsigned int pipe = 0;
@@ -1305,9 +1305,6 @@ static int uclogic_params_ugee_v2_init(struct uclogic_params *params,
 	__u8 *rdesc_pen = NULL;
 	s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM];
 	enum uclogic_params_frame_type frame_type;
-	__u8 magic_arr[] = {
-		0x02, 0xb0, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
-	};
 	/* The resulting parameters (noop) */
 	struct uclogic_params p = {0, };
 
@@ -1337,7 +1334,9 @@ static int uclogic_params_ugee_v2_init(struct uclogic_params *params,
 	 * The specific data was discovered by sniffing the Windows driver
 	 * traffic.
 	 */
-	rc = uclogic_probe_interface(hdev, magic_arr, sizeof(magic_arr), 0x03);
+	rc = uclogic_probe_interface(hdev, uclogic_ugee_v2_probe_arr,
+				     uclogic_ugee_v2_probe_size,
+				     uclogic_ugee_v2_probe_endpoint);
 	if (rc) {
 		uclogic_params_init_invalid(&p);
 		goto output;
diff --git a/drivers/hid/hid-uclogic-rdesc.c b/drivers/hid/hid-uclogic-rdesc.c
index fb40775f5f5b..b6dfdf6356a6 100644
--- a/drivers/hid/hid-uclogic-rdesc.c
+++ b/drivers/hid/hid-uclogic-rdesc.c
@@ -859,6 +859,12 @@ const __u8 uclogic_rdesc_v2_frame_dial_arr[] = {
 const size_t uclogic_rdesc_v2_frame_dial_size =
 			sizeof(uclogic_rdesc_v2_frame_dial_arr);
 
+const __u8 uclogic_ugee_v2_probe_arr[] = {
+	0x02, 0xb0, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+const size_t uclogic_ugee_v2_probe_size = sizeof(uclogic_ugee_v2_probe_arr);
+const int uclogic_ugee_v2_probe_endpoint = 0x03;
+
 /* Fixed report descriptor template for UGEE v2 pen reports */
 const __u8 uclogic_rdesc_ugee_v2_pen_template_arr[] = {
 	0x05, 0x0d,         /*  Usage Page (Digitizers),                */
diff --git a/drivers/hid/hid-uclogic-rdesc.h b/drivers/hid/hid-uclogic-rdesc.h
index a1f78c07293f..906d068f50a9 100644
--- a/drivers/hid/hid-uclogic-rdesc.h
+++ b/drivers/hid/hid-uclogic-rdesc.h
@@ -164,6 +164,11 @@ extern const size_t uclogic_rdesc_v2_frame_dial_size;
 /* Report ID for tweaked UGEE v2 battery reports */
 #define UCLOGIC_RDESC_UGEE_V2_BATTERY_ID 0xba
 
+/* Magic data expected by UGEEv2 devices on probe */
+extern const __u8 uclogic_ugee_v2_probe_arr[];
+extern const size_t uclogic_ugee_v2_probe_size;
+extern const int uclogic_ugee_v2_probe_endpoint;
+
 /* Fixed report descriptor template for UGEE v2 pen reports */
 extern const __u8 uclogic_rdesc_ugee_v2_pen_template_arr[];
 extern const size_t uclogic_rdesc_ugee_v2_pen_template_size;
-- 
2.39.1