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Date: Mon, 1 Jul 2024 10:45:25 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: Jiri Kosina <jikos@...nel.org>, "bentiss@...nel.org" <bentiss@...nel.org>
CC: "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>, Linux Kernel
Mailing List <linux-kernel@...r.kernel.org>, Orlando Chamberlain
<orlandoch.dev@...il.com>
Subject: [PATCH] HID: apple: Add support for magic keyboard backlight on T2
Macs
From: Orlando Chamberlain <orlandoch.dev@...il.com>
Unlike T2 Macs with Butterfly keyboard, who have their keyboard backlight
on the USB device the T2 Macs with Magic keyboard have their backlight on
the Touchbar backlight device (05ac:8102).
Support for Butterfly keyboards has already been added in 9018eacbe623
("HID: apple: Add support for keyboard backlight on certain T2 Macs.").
This patch adds support for the Magic keyboards.
Co-developed-by: Aditya Garg <gargaditya08@...e.com>
Signed-off-by: Aditya Garg <gargaditya08@...e.com>
Signed-off-by: Orlando Chamberlain <orlandoch.dev@...il.com>
---
drivers/hid/hid-apple.c | 87 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 86 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
index bd022e004..db279948c 100644
--- a/drivers/hid/hid-apple.c
+++ b/drivers/hid/hid-apple.c
@@ -8,6 +8,8 @@
* Copyright (c) 2006-2007 Jiri Kosina
* Copyright (c) 2008 Jiri Slaby <jirislaby@...il.com>
* Copyright (c) 2019 Paul Pawlowski <paul@...rm.io>
+ * Copyright (c) 2023 Orlando Chamberlain <orlandoch.dev@...il.com>
+ * Copyright (c) 2024 Aditya Garg <gargaditya08@...e.com>
*/
/*
@@ -23,6 +25,7 @@
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/leds.h>
+#include <dt-bindings/leds/common.h>
#include "hid-ids.h"
@@ -37,13 +40,18 @@
#define APPLE_NUMLOCK_EMULATION BIT(8)
#define APPLE_RDESC_BATTERY BIT(9)
#define APPLE_BACKLIGHT_CTL BIT(10)
-#define APPLE_IS_NON_APPLE BIT(11)
+#define APPLE_MAGIC_BACKLIGHT BIT(11)
+#define APPLE_IS_NON_APPLE BIT(12)
#define APPLE_FLAG_FKEY 0x01
#define HID_COUNTRY_INTERNATIONAL_ISO 13
#define APPLE_BATTERY_TIMEOUT_MS 60000
+#define HID_USAGE_MAGIC_BL 0xff00000f
+#define APPLE_MAGIC_REPORT_ID_POWER 3
+#define APPLE_MAGIC_REPORT_ID_BRIGHTNESS 1
+
static unsigned int fnmode = 3;
module_param(fnmode, uint, 0644);
MODULE_PARM_DESC(fnmode, "Mode of fn key on Apple keyboards (0 = disabled, "
@@ -81,6 +89,12 @@ struct apple_sc_backlight {
struct hid_device *hdev;
};
+struct apple_magic_backlight {
+ struct led_classdev cdev;
+ struct hid_report *brightness;
+ struct hid_report *power;
+};
+
struct apple_sc {
struct hid_device *hdev;
unsigned long quirks;
@@ -822,6 +836,72 @@ static int apple_backlight_init(struct hid_device *hdev)
return ret;
}
+static void apple_magic_backlight_report_set(struct hid_report *rep, s32 value, u8 rate)
+{
+ rep->field[0]->value[0] = value;
+ rep->field[1]->value[0] = 0x5e; /* Mimic Windows */
+ rep->field[1]->value[0] |= rate << 8;
+
+ hid_hw_request(rep->device, rep, HID_REQ_SET_REPORT);
+}
+
+static void apple_magic_backlight_set(struct apple_magic_backlight *backlight,
+ int brightness, char rate)
+{
+ apple_magic_backlight_report_set(backlight->power, brightness ? 1 : 0, rate);
+ if (brightness)
+ apple_magic_backlight_report_set(backlight->brightness, brightness, rate);
+}
+
+static int apple_magic_backlight_led_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct apple_magic_backlight *backlight = container_of(led_cdev,
+ struct apple_magic_backlight, cdev);
+
+ apple_magic_backlight_set(backlight, brightness, 1);
+ return 0;
+}
+
+static int apple_magic_backlight_init(struct hid_device *hdev)
+{
+ struct apple_magic_backlight *backlight;
+ int rc;
+
+ /*
+ * Ensure this usb endpoint is for the keyboard backlight, not touchbar
+ * backlight.
+ */
+ if (hdev->collection[0].usage != HID_USAGE_MAGIC_BL)
+ return -ENODEV;
+
+ backlight = devm_kzalloc(&hdev->dev, sizeof(*backlight), GFP_KERNEL);
+ if (!backlight)
+ return -ENOMEM;
+
+ backlight->brightness = hid_register_report(hdev, HID_FEATURE_REPORT,
+ APPLE_MAGIC_REPORT_ID_BRIGHTNESS, 0);
+ backlight->power = hid_register_report(hdev, HID_FEATURE_REPORT,
+ APPLE_MAGIC_REPORT_ID_POWER, 0);
+
+ if (!backlight->brightness || !backlight->power) {
+ rc = -ENODEV;
+ goto hw_stop;
+ }
+
+ backlight->cdev.name = ":white:" LED_FUNCTION_KBD_BACKLIGHT;
+ backlight->cdev.max_brightness = backlight->brightness->field[0]->logical_maximum;
+ backlight->cdev.brightness_set_blocking = apple_magic_backlight_led_set;
+
+ apple_magic_backlight_set(backlight, 0, 0);
+
+ return devm_led_classdev_register(&hdev->dev, &backlight->cdev);
+
+hw_stop:
+ hid_hw_stop(hdev);
+ return rc;
+}
+
static int apple_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
@@ -860,6 +940,9 @@ static int apple_probe(struct hid_device *hdev,
if (quirks & APPLE_BACKLIGHT_CTL)
apple_backlight_init(hdev);
+ if (quirks & APPLE_MAGIC_BACKLIGHT)
+ apple_magic_backlight_init(hdev);
+
return 0;
}
@@ -1073,6 +1156,8 @@ static const struct hid_device_id apple_devices[] = {
.driver_data = APPLE_HAS_FN | APPLE_ISO_TILDE_QUIRK | APPLE_RDESC_BATTERY },
{ HID_BLUETOOTH_DEVICE(BT_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_MAGIC_KEYBOARD_NUMPAD_2021),
.driver_data = APPLE_HAS_FN | APPLE_ISO_TILDE_QUIRK },
+ { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_TOUCHBAR_BACKLIGHT),
+ .driver_data = APPLE_MAGIC_BACKLIGHT },
{ }
};
--
2.43.0
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