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Fri, 17 Feb 2023 02:24:13 -0800 (PST) Received: from localhost.localdomain ([202.53.32.211]) by smtp.gmail.com with ESMTPSA id w4-20020a1709029a8400b0019aaba5c90bsm2832538plp.84.2023.02.17.02.24.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Feb 2023 02:24:13 -0800 (PST) From: Orlando Chamberlain To: linux-doc@vger.kernel.org, linux-input@vger.kernel.org Cc: Jonathan Corbet , Jiri Kosina , Benjamin Tissoires , linux-kernel@vger.kernel.org, Pavel Machek , Aditya Garg , Aun-Ali Zaidi , Kerem Karabay , Andy Shevchenko , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Orlando Chamberlain Subject: [PATCH v3 2/2] HID: hid-apple-magic-backlight: Add driver for keyboard backlight on internal Magic Keyboards Date: Fri, 17 Feb 2023 21:23:20 +1100 Message-Id: <20230217102319.3419-3-orlandoch.dev@gmail.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230217102319.3419-1-orlandoch.dev@gmail.com> References: <20230217102319.3419-1-orlandoch.dev@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This driver adds support for the keyboard backlight on Intel T2 Macs with internal Magic Keyboards (MacBookPro16,x and MacBookAir9,1) Co-developed-by: Kerem Karabay Signed-off-by: Kerem Karabay Signed-off-by: Orlando Chamberlain --- v2->v3: - remove unneeded inclusion - use s32 for report value type - remove unneeded null check - don't set drvdata as its never used - prepend "hid-" to module name v1->v2: - drop unneeded remove function - combine set functions - add missing header inclusions - avoid char as argument in favour of u8 - handful of style/formatting fixes - use standard led name ":white:kbd_backlight" - rename USAGE_MAGIC_BL to HID_USAGE_MAGIC_BL MAINTAINERS | 6 ++ drivers/hid/Kconfig | 13 +++ drivers/hid/Makefile | 1 + drivers/hid/hid-apple-magic-backlight.c | 122 ++++++++++++++++++++++++ 4 files changed, 142 insertions(+) create mode 100644 drivers/hid/hid-apple-magic-backlight.c diff --git a/MAINTAINERS b/MAINTAINERS index fb1471cb5ed3..3319f0c3ed1e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9201,6 +9201,12 @@ F: include/linux/pm.h F: include/linux/suspend.h F: kernel/power/ +HID APPLE MAGIC BACKLIGHT DRIVER +M: Orlando Chamberlain +L: linux-input@vger.kernel.org +S: Maintained +F: drivers/hid/apple-magic-backlight.c + HID CORE LAYER M: Jiri Kosina M: Benjamin Tissoires diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index e2a5d30c8895..fe489632bfd9 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -130,6 +130,19 @@ config HID_APPLE Say Y here if you want support for keyboards of Apple iBooks, PowerBooks, MacBooks, MacBook Pros and Apple Aluminum. +config HID_APPLE_MAGIC_BACKLIGHT + tristate "Apple Magic Keyboard Backlight" + depends on USB_HID + depends on LEDS_CLASS + depends on NEW_LEDS + help + Say Y here if you want support for the keyboard backlight on Macs with + the magic keyboard (MacBookPro16,x and MacBookAir9,1). Note that this + driver is not for external magic keyboards. + + To compile this driver as a module, choose M here: the + module will be called hid-apple-magic-backlight. + config HID_APPLEIR tristate "Apple infrared receiver" depends on (USB_HID) diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile index e8014c1a2f8b..dc8df002bc86 100644 --- a/drivers/hid/Makefile +++ b/drivers/hid/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_HID_ACCUTOUCH) += hid-accutouch.o obj-$(CONFIG_HID_ALPS) += hid-alps.o obj-$(CONFIG_HID_ACRUX) += hid-axff.o obj-$(CONFIG_HID_APPLE) += hid-apple.o +obj-$(CONFIG_HID_APPLE_MAGIC_BACKLIGHT) += hid-apple-magic-backlight.o obj-$(CONFIG_HID_APPLEIR) += hid-appleir.o obj-$(CONFIG_HID_CREATIVE_SB0540) += hid-creative-sb0540.o obj-$(CONFIG_HID_ASUS) += hid-asus.o diff --git a/drivers/hid/hid-apple-magic-backlight.c b/drivers/hid/hid-apple-magic-backlight.c new file mode 100644 index 000000000000..210af2849e78 --- /dev/null +++ b/drivers/hid/hid-apple-magic-backlight.c @@ -0,0 +1,122 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Apple Magic Keyboard Backlight Driver + * + * For Intel Macs with internal Magic Keyboard (MacBookPro16,1-4 and MacBookAir9,1) + * + * Copyright (c) 2022 Kerem Karabay + * Copyright (c) 2023 Orlando Chamberlain + */ + +#include +#include +#include +#include +#include + +#include "hid-ids.h" + +#define HID_USAGE_MAGIC_BL 0xff00000f + +#define APPLE_MAGIC_REPORT_ID_POWER 3 +#define APPLE_MAGIC_REPORT_ID_BRIGHTNESS 1 + +struct apple_magic_backlight { + struct led_classdev cdev; + struct hid_device *hdev; + struct hid_report *brightness; + struct hid_report *power; +}; + +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_probe(struct hid_device *hdev, + const struct hid_device_id *id) +{ + struct apple_magic_backlight *backlight; + int rc; + + rc = hid_parse(hdev); + if (rc) + return 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; + + rc = hid_hw_start(hdev, HID_CONNECT_DEFAULT); + if (rc) + return rc; + + 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->hdev = hdev; + 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 const struct hid_device_id apple_magic_backlight_hid_ids[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_TOUCHBAR_BACKLIGHT) }, + { } +}; +MODULE_DEVICE_TABLE(hid, apple_magic_backlight_hid_ids); + +static struct hid_driver apple_magic_backlight_hid_driver = { + .name = "hid-apple-magic-backlight", + .id_table = apple_magic_backlight_hid_ids, + .probe = apple_magic_backlight_probe, +}; +module_hid_driver(apple_magic_backlight_hid_driver); + +MODULE_DESCRIPTION("MacBook Magic Keyboard Backlight"); +MODULE_AUTHOR("Orlando Chamberlain "); +MODULE_LICENSE("GPL"); -- 2.39.1