[PATCH AUTOSEL 6.1 18/85] HID: apple: fix key translations where multiple quirks attempt to translate the same key

[PATCH AUTOSEL 6.1 18/85] HID: apple: fix key translations where multiple quirks attempt to translate the same key

[Sasha Levin]

From: Kerem Karabay <kekrby@gmail.com>

[ Upstream commit 5476fcf7f7b901db1cea92acb1abdd12609e30e1 ]

The hid-apple driver does not support chaining translations or
dependencies on other translations. This creates two problems:

1 - In Non-English keyboards of Macs, KEY_102ND and KEY_GRAVE are
swapped and the APPLE_ISO_TILDE_QUIRK is used to work around this
problem. The quirk is not set for the Macs where these bugs happen yet
(see the 2nd patch for that), but this can be forced by setting the
iso_layout parameter. Unfortunately, this only partially works.
KEY_102ND gets translated to KEY_GRAVE, but KEY_GRAVE does not get
translated to KEY_102ND, so both of them end up functioning as
KEY_GRAVE. This is because the driver translates the keys as if Fn was
pressed and the original is sent if it is not pressed, without any
further translations happening on the key[#463]. KEY_GRAVE is present at
macbookpro_no_esc_fn_keys[#195], so this is what happens:

    - KEY_GRAVE -> KEY_ESC (as if Fn is pressed)
    - KEY_GRAVE is returned (Fn isn't pressed, so translation is discarded)
    - KEY_GRAVE -> KEY_102ND (this part is not reached!)
    ...

2 - In case the touchbar does not work, the driver supports sending
Escape when Fn+KEY_GRAVE is pressed. As mentioned previously, KEY_102ND
is actually KEY_GRAVE and needs to be translated before this happens.

Normally, these are the steps that should happen:

    - KEY_102ND -> KEY_GRAVE
    - KEY_GRAVE -> KEY_ESC (Fn is pressed)
    - KEY_ESC is returned

Though this is what happens instead, as dependencies on other
translations are not supported:

    - KEY_102ND -> KEY_ESC (Fn is pressed)
    - KEY_ESC is returned

This patch fixes both bugs by ordering the translations correctly and by
making the translations continue and not return immediately after
translating a key so that chained translations work and translations can
depend on other ones.

This patch also simplifies the implementation of the swap_fn_leftctrl
option a little bit, as it makes it simply use a normal translation
instead adding extra code to translate a key to KEY_FN[#381]. This change
wasn't put in another patch as the code that translates the Fn key needs
to be changed because of the changes in the patch, and those changes
would be discarded with the next patch anyway (the part that originally
translates KEY_FN to KEY_LEFTCTRL needs to be made an else-if branch of
the part that transltes KEY_LEFTCTRL to KEY_FN).

Note: Line numbers (#XYZ) are for drivers/hid/hid-apple.c at commit
20afcc462579 ("HID: apple: Add "GANSS" to the non-Apple list").

Note: These bugs are only present on Macs with a keyboard with no
dedicated escape key and a non-English layout.

Signed-off-by: Kerem Karabay <kekrby@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-apple.c | 102 +++++++++++++++++-----------------------
 1 file changed, 44 insertions(+), 58 deletions(-)

diff --git a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
index 6970797cdc56..e86bbf85b87e 100644
--- a/drivers/hid/hid-apple.c
+++ b/drivers/hid/hid-apple.c
@@ -314,6 +314,7 @@ static const struct apple_key_translation swapped_option_cmd_keys[] = {
 
 static const struct apple_key_translation swapped_fn_leftctrl_keys[] = {
 	{ KEY_FN, KEY_LEFTCTRL },
+	{ KEY_LEFTCTRL, KEY_FN },
 	{ }
 };
 
@@ -375,24 +376,40 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
 	struct apple_sc *asc = hid_get_drvdata(hid);
 	const struct apple_key_translation *trans, *table;
 	bool do_translate;
-	u16 code = 0;
+	u16 code = usage->code;
 	unsigned int real_fnmode;
 
-	u16 fn_keycode = (swap_fn_leftctrl) ? (KEY_LEFTCTRL) : (KEY_FN);
-
-	if (usage->code == fn_keycode) {
-		asc->fn_on = !!value;
-		input_event_with_scancode(input, usage->type, KEY_FN,
-				usage->hid, value);
-		return 1;
-	}
-
 	if (fnmode == 3) {
 		real_fnmode = (asc->quirks & APPLE_IS_NON_APPLE) ? 2 : 1;
 	} else {
 		real_fnmode = fnmode;
 	}
 
+	if (swap_fn_leftctrl) {
+		trans = apple_find_translation(swapped_fn_leftctrl_keys, code);
+
+		if (trans)
+			code = trans->to;
+	}
+
+	if (iso_layout > 0 || (iso_layout < 0 && (asc->quirks & APPLE_ISO_TILDE_QUIRK) &&
+			hid->country == HID_COUNTRY_INTERNATIONAL_ISO)) {
+		trans = apple_find_translation(apple_iso_keyboard, code);
+
+		if (trans)
+			code = trans->to;
+	}
+
+	if (swap_opt_cmd) {
+		trans = apple_find_translation(swapped_option_cmd_keys, code);
+
+		if (trans)
+			code = trans->to;
+	}
+
+	if (code == KEY_FN)
+		asc->fn_on = !!value;
+
 	if (real_fnmode) {
 		if (hid->product == USB_DEVICE_ID_APPLE_ALU_WIRELESS_ANSI ||
 		    hid->product == USB_DEVICE_ID_APPLE_ALU_WIRELESS_ISO ||
@@ -430,15 +447,18 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
 		else
 			table = apple_fn_keys;
 
-		trans = apple_find_translation (table, usage->code);
+		trans = apple_find_translation(table, code);
 
 		if (trans) {
-			if (test_bit(trans->from, input->key))
+			bool from_is_set = test_bit(trans->from, input->key);
+			bool to_is_set = test_bit(trans->to, input->key);
+
+			if (from_is_set)
 				code = trans->from;
-			else if (test_bit(trans->to, input->key))
+			else if (to_is_set)
 				code = trans->to;
 
-			if (!code) {
+			if (!(from_is_set || to_is_set)) {
 				if (trans->flags & APPLE_FLAG_FKEY) {
 					switch (real_fnmode) {
 					case 1:
@@ -455,62 +475,31 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
 					do_translate = asc->fn_on;
 				}
 
-				code = do_translate ? trans->to : trans->from;
+				if (do_translate)
+					code = trans->to;
 			}
-
-			input_event_with_scancode(input, usage->type, code,
-					usage->hid, value);
-			return 1;
 		}
 
 		if (asc->quirks & APPLE_NUMLOCK_EMULATION &&
-				(test_bit(usage->code, asc->pressed_numlock) ||
+				(test_bit(code, asc->pressed_numlock) ||
 				test_bit(LED_NUML, input->led))) {
-			trans = apple_find_translation(powerbook_numlock_keys,
-					usage->code);
+			trans = apple_find_translation(powerbook_numlock_keys, code);
 
 			if (trans) {
 				if (value)
-					set_bit(usage->code,
-							asc->pressed_numlock);
+					set_bit(code, asc->pressed_numlock);
 				else
-					clear_bit(usage->code,
-							asc->pressed_numlock);
+					clear_bit(code, asc->pressed_numlock);
 
-				input_event_with_scancode(input, usage->type,
-						trans->to, usage->hid, value);
+				code = trans->to;
 			}
-
-			return 1;
 		}
 	}
 
-	if (iso_layout > 0 || (iso_layout < 0 && (asc->quirks & APPLE_ISO_TILDE_QUIRK) &&
-			hid->country == HID_COUNTRY_INTERNATIONAL_ISO)) {
-		trans = apple_find_translation(apple_iso_keyboard, usage->code);
-		if (trans) {
-			input_event_with_scancode(input, usage->type,
-					trans->to, usage->hid, value);
-			return 1;
-		}
-	}
+	if (usage->code != code) {
+		input_event_with_scancode(input, usage->type, code, usage->hid, value);
 
-	if (swap_opt_cmd) {
-		trans = apple_find_translation(swapped_option_cmd_keys, usage->code);
-		if (trans) {
-			input_event_with_scancode(input, usage->type,
-					trans->to, usage->hid, value);
-			return 1;
-		}
-	}
-
-	if (swap_fn_leftctrl) {
-		trans = apple_find_translation(swapped_fn_leftctrl_keys, usage->code);
-		if (trans) {
-			input_event_with_scancode(input, usage->type,
-					trans->to, usage->hid, value);
-			return 1;
-		}
+		return 1;
 	}
 
 	return 0;
@@ -640,9 +629,6 @@ static void apple_setup_input(struct input_dev *input)
 	apple_setup_key_translation(input, apple2021_fn_keys);
 	apple_setup_key_translation(input, macbookpro_no_esc_fn_keys);
 	apple_setup_key_translation(input, macbookpro_dedicated_esc_fn_keys);
-
-	if (swap_fn_leftctrl)
-		apple_setup_key_translation(input, swapped_fn_leftctrl_keys);
 }
 
 static int apple_input_mapping(struct hid_device *hdev, struct hid_input *hi,
-- 
2.35.1

[PATCH AUTOSEL 6.1 19/85] HID: apple: enable APPLE_ISO_TILDE_QUIRK for the keyboards of Macs with the T2 chip

[Sasha Levin]

From: Kerem Karabay <kekrby@gmail.com>

[ Upstream commit 084bc074c231e716cbcb9e8f9db05b17fd3563cf ]

The iso_layout parameter must be manually set to get the driver to
swap KEY_102ND and KEY_GRAVE. This patch eliminates the need to do that.

This is safe to do, as Macs with keyboards that do not need the quirk
will keep working the same way as the value of hid->country will be
different than HID_COUNTRY_INTERNATIONAL_ISO. This was tested by one
person with a Mac with the WELLSPRINGT2_J152F keyboard with a layout
that does not require the quirk to be set.

Signed-off-by: Kerem Karabay <kekrby@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-apple.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
index e86bbf85b87e..c671ce94671c 100644
--- a/drivers/hid/hid-apple.c
+++ b/drivers/hid/hid-apple.c
@@ -997,21 +997,21 @@ static const struct hid_device_id apple_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING9_JIS),
 		.driver_data = APPLE_HAS_FN | APPLE_RDESC_JIS },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRINGT2_J140K),
-		.driver_data = APPLE_HAS_FN | APPLE_BACKLIGHT_CTL },
+		.driver_data = APPLE_HAS_FN | APPLE_BACKLIGHT_CTL | APPLE_ISO_TILDE_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRINGT2_J132),
-		.driver_data = APPLE_HAS_FN | APPLE_BACKLIGHT_CTL },
+		.driver_data = APPLE_HAS_FN | APPLE_BACKLIGHT_CTL | APPLE_ISO_TILDE_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRINGT2_J680),
-		.driver_data = APPLE_HAS_FN | APPLE_BACKLIGHT_CTL },
+		.driver_data = APPLE_HAS_FN | APPLE_BACKLIGHT_CTL | APPLE_ISO_TILDE_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRINGT2_J213),
-		.driver_data = APPLE_HAS_FN | APPLE_BACKLIGHT_CTL },
+		.driver_data = APPLE_HAS_FN | APPLE_BACKLIGHT_CTL | APPLE_ISO_TILDE_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRINGT2_J214K),
-		.driver_data = APPLE_HAS_FN },
+		.driver_data = APPLE_HAS_FN | APPLE_ISO_TILDE_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRINGT2_J223),
-		.driver_data = APPLE_HAS_FN },
+		.driver_data = APPLE_HAS_FN | APPLE_ISO_TILDE_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRINGT2_J230K),
-		.driver_data = APPLE_HAS_FN },
+		.driver_data = APPLE_HAS_FN | APPLE_ISO_TILDE_QUIRK },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRINGT2_J152F),
-		.driver_data = APPLE_HAS_FN },
+		.driver_data = APPLE_HAS_FN | APPLE_ISO_TILDE_QUIRK },
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ANSI),
 		.driver_data = APPLE_NUMLOCK_EMULATION | APPLE_HAS_FN },
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ISO),
-- 
2.35.1

[PATCH AUTOSEL 6.1 28/85] HID: input: do not query XP-PEN Deco LW battery

[Sasha Levin]

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

[ Upstream commit 037c1aaeb96fe5f778026f4c1ef28b26cf600bfa ]

The XP-PEN Deco LW drawing tablet can be connected by USB cable or using
a USB Bluetooth dongle. When it is connected using the dongle, there
might be a small delay until the tablet is paired with the dongle.

Fetching the device battery during this delay results in random battery
percentage values.

Add a quirk to avoid actively querying the battery percentage and wait
for the device to report it on its own.

Reported-by: Mia Kanashi <chad@redpilled.dev>
Tested-by: Mia Kanashi <chad@redpilled.dev>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-input.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 859aeb07542e..d728a94c642e 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -340,6 +340,7 @@ static enum power_supply_property hidinput_battery_props[] = {
 #define HID_BATTERY_QUIRK_PERCENT	(1 << 0) /* always reports percent */
 #define HID_BATTERY_QUIRK_FEATURE	(1 << 1) /* ask for feature report */
 #define HID_BATTERY_QUIRK_IGNORE	(1 << 2) /* completely ignore the battery */
+#define HID_BATTERY_QUIRK_AVOID_QUERY	(1 << 3) /* do not query the battery */
 
 static const struct hid_device_id hid_battery_quirks[] = {
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
@@ -373,6 +374,8 @@ static const struct hid_device_id hid_battery_quirks[] = {
 	  HID_BATTERY_QUIRK_IGNORE },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550VE_TOUCHSCREEN),
 	  HID_BATTERY_QUIRK_IGNORE },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE, USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L),
+	  HID_BATTERY_QUIRK_AVOID_QUERY },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_15),
 	  HID_BATTERY_QUIRK_IGNORE },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_15T_DR100),
@@ -554,6 +557,9 @@ static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 	dev->battery_avoid_query = report_type == HID_INPUT_REPORT &&
 				   field->physical == HID_DG_STYLUS;
 
+	if (quirks & HID_BATTERY_QUIRK_AVOID_QUERY)
+		dev->battery_avoid_query = true;
+
 	dev->battery = power_supply_register(&dev->dev, psy_desc, &psy_cfg);
 	if (IS_ERR(dev->battery)) {
 		error = PTR_ERR(dev->battery);
-- 
2.35.1

[PATCH AUTOSEL 6.1 29/85] HID: uclogic: Add support for XP-PEN Deco LW

[Sasha Levin]

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

[ Upstream commit f9ce4db0ec2b6301f4264ba8627863e2632c922b ]

The XP-PEN Deco LW is a UGEE v2 device with a frame with 8 buttons.
Its pen has 2 buttons, supports tilt and pressure.

It can be connected by USB cable or using a USB Bluetooth dongle to use
it in wireless mode. When it is connected using the dongle, the device
battery is used to power it.

Its vendor, product and version are identical to the Deco L. The only
difference reported by its firmware is the product name.
In order to add support for battery reporting, add a new HID descriptor
and a quirk to detect the wireless version of the tablet.

Link: https://github.com/DIGImend/digimend-kernel-drivers/issues/635
Tested-by: Mia Kanashi <chad@redpilled.dev>
Tested-by: Andreas Grosse <andig.mail@t-online.de>
Tested-by: Mia Kanashi <chad@redpilled.dev>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-uclogic-params.c | 73 ++++++++++++++++++++++++++++++++
 drivers/hid/hid-uclogic-rdesc.c  | 34 +++++++++++++++
 drivers/hid/hid-uclogic-rdesc.h  |  7 +++
 3 files changed, 114 insertions(+)

diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
index 34fa991e6267..cd1233d7e253 100644
--- a/drivers/hid/hid-uclogic-params.c
+++ b/drivers/hid/hid-uclogic-params.c
@@ -18,6 +18,7 @@
 #include "usbhid/usbhid.h"
 #include "hid-ids.h"
 #include <linux/ctype.h>
+#include <linux/string.h>
 #include <asm/unaligned.h>
 
 /**
@@ -1211,6 +1212,69 @@ static int uclogic_params_ugee_v2_init_frame_mouse(struct uclogic_params *p)
 	return rc;
 }
 
+/**
+ * uclogic_params_ugee_v2_has_battery() - check whether a UGEE v2 device has
+ * battery or not.
+ * @hdev:	The HID device of the tablet interface.
+ *
+ * Returns:
+ *	True if the device has battery, false otherwise.
+ */
+static bool uclogic_params_ugee_v2_has_battery(struct hid_device *hdev)
+{
+	/* The XP-PEN Deco LW vendor, product and version are identical to the
+	 * Deco L. The only difference reported by their firmware is the product
+	 * name. Add a quirk to support battery reporting on the wireless
+	 * version.
+	 */
+	if (hdev->vendor == USB_VENDOR_ID_UGEE &&
+	    hdev->product == USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L) {
+		struct usb_device *udev = hid_to_usb_dev(hdev);
+
+		if (strstarts(udev->product, "Deco LW"))
+			return true;
+	}
+
+	return false;
+}
+
+/**
+ * uclogic_params_ugee_v2_init_battery() - initialize UGEE v2 battery reporting.
+ * @hdev:	The HID device of the tablet interface, cannot be NULL.
+ * @p:		Parameters to fill in, cannot be NULL.
+ *
+ * Returns:
+ *	Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_ugee_v2_init_battery(struct hid_device *hdev,
+					       struct uclogic_params *p)
+{
+	int rc = 0;
+
+	if (!hdev || !p)
+		return -EINVAL;
+
+	/* Some tablets contain invalid characters in hdev->uniq, throwing a
+	 * "hwmon: '<name>' is not a valid name attribute, please fix" error.
+	 * Use the device vendor and product IDs instead.
+	 */
+	snprintf(hdev->uniq, sizeof(hdev->uniq), "%x-%x", hdev->vendor,
+		 hdev->product);
+
+	rc = uclogic_params_frame_init_with_desc(&p->frame_list[1],
+						 uclogic_rdesc_ugee_v2_battery_template_arr,
+						 uclogic_rdesc_ugee_v2_battery_template_size,
+						 UCLOGIC_RDESC_UGEE_V2_BATTERY_ID);
+	if (rc)
+		return rc;
+
+	p->frame_list[1].suffix = "Battery";
+	p->pen.subreport_list[1].value = 0xf2;
+	p->pen.subreport_list[1].id = UCLOGIC_RDESC_UGEE_V2_BATTERY_ID;
+
+	return rc;
+}
+
 /**
  * uclogic_params_ugee_v2_init() - initialize a UGEE graphics tablets by
  * discovering their parameters.
@@ -1334,6 +1398,15 @@ static int uclogic_params_ugee_v2_init(struct uclogic_params *params,
 	if (rc)
 		goto cleanup;
 
+	/* Initialize the battery interface*/
+	if (uclogic_params_ugee_v2_has_battery(hdev)) {
+		rc = uclogic_params_ugee_v2_init_battery(hdev, &p);
+		if (rc) {
+			hid_err(hdev, "error initializing battery: %d\n", rc);
+			goto cleanup;
+		}
+	}
+
 output:
 	/* Output parameters */
 	memcpy(params, &p, sizeof(*params));
diff --git a/drivers/hid/hid-uclogic-rdesc.c b/drivers/hid/hid-uclogic-rdesc.c
index 6b73eb0df6bd..fb40775f5f5b 100644
--- a/drivers/hid/hid-uclogic-rdesc.c
+++ b/drivers/hid/hid-uclogic-rdesc.c
@@ -1035,6 +1035,40 @@ const __u8 uclogic_rdesc_ugee_v2_frame_mouse_template_arr[] = {
 const size_t uclogic_rdesc_ugee_v2_frame_mouse_template_size =
 			sizeof(uclogic_rdesc_ugee_v2_frame_mouse_template_arr);
 
+/* Fixed report descriptor template for UGEE v2 battery reports */
+const __u8 uclogic_rdesc_ugee_v2_battery_template_arr[] = {
+	0x05, 0x01,         /*  Usage Page (Desktop),                   */
+	0x09, 0x07,         /*  Usage (Keypad),                         */
+	0xA1, 0x01,         /*  Collection (Application),               */
+	0x85, UCLOGIC_RDESC_UGEE_V2_BATTERY_ID,
+			    /*      Report ID,                          */
+	0x75, 0x08,         /*      Report Size (8),                    */
+	0x95, 0x02,         /*      Report Count (2),                   */
+	0x81, 0x01,         /*      Input (Constant),                   */
+	0x05, 0x84,         /*      Usage Page (Power Device),          */
+	0x05, 0x85,         /*      Usage Page (Battery System),        */
+	0x09, 0x65,         /*      Usage Page (AbsoluteStateOfCharge), */
+	0x75, 0x08,         /*      Report Size (8),                    */
+	0x95, 0x01,         /*      Report Count (1),                   */
+	0x15, 0x00,         /*      Logical Minimum (0),                */
+	0x26, 0xff, 0x00,   /*      Logical Maximum (255),              */
+	0x81, 0x02,         /*      Input (Variable),                   */
+	0x75, 0x01,         /*      Report Size (1),                    */
+	0x95, 0x01,         /*      Report Count (1),                   */
+	0x15, 0x00,         /*      Logical Minimum (0),                */
+	0x25, 0x01,         /*      Logical Maximum (1),                */
+	0x09, 0x44,         /*      Usage Page (Charging),              */
+	0x81, 0x02,         /*      Input (Variable),                   */
+	0x95, 0x07,         /*      Report Count (7),                   */
+	0x81, 0x01,         /*      Input (Constant),                   */
+	0x75, 0x08,         /*      Report Size (8),                    */
+	0x95, 0x07,         /*      Report Count (7),                   */
+	0x81, 0x01,         /*      Input (Constant),                   */
+	0xC0                /*  End Collection                          */
+};
+const size_t uclogic_rdesc_ugee_v2_battery_template_size =
+			sizeof(uclogic_rdesc_ugee_v2_battery_template_arr);
+
 /* Fixed report descriptor for Ugee EX07 frame */
 const __u8 uclogic_rdesc_ugee_ex07_frame_arr[] = {
 	0x05, 0x01,             /*  Usage Page (Desktop),                   */
diff --git a/drivers/hid/hid-uclogic-rdesc.h b/drivers/hid/hid-uclogic-rdesc.h
index 0502a0656496..a1f78c07293f 100644
--- a/drivers/hid/hid-uclogic-rdesc.h
+++ b/drivers/hid/hid-uclogic-rdesc.h
@@ -161,6 +161,9 @@ extern const size_t uclogic_rdesc_v2_frame_dial_size;
 /* Device ID byte offset in v2 frame dial reports */
 #define UCLOGIC_RDESC_V2_FRAME_DIAL_DEV_ID_BYTE	0x4
 
+/* Report ID for tweaked UGEE v2 battery reports */
+#define UCLOGIC_RDESC_UGEE_V2_BATTERY_ID 0xba
+
 /* 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;
@@ -177,6 +180,10 @@ extern const size_t uclogic_rdesc_ugee_v2_frame_dial_template_size;
 extern const __u8 uclogic_rdesc_ugee_v2_frame_mouse_template_arr[];
 extern const size_t uclogic_rdesc_ugee_v2_frame_mouse_template_size;
 
+/* Fixed report descriptor template for UGEE v2 battery reports */
+extern const __u8 uclogic_rdesc_ugee_v2_battery_template_arr[];
+extern const size_t uclogic_rdesc_ugee_v2_battery_template_size;
+
 /* Fixed report descriptor for Ugee EX07 frame */
 extern const __u8 uclogic_rdesc_ugee_ex07_frame_arr[];
 extern const size_t uclogic_rdesc_ugee_ex07_frame_size;
-- 
2.35.1