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Wysocki" Cc: Hans de Goede , Andy Shevchenko , linux-acpi@vger.kernel.org Subject: [RFC 2/2] ACPI: x86: Add DELL0501 handling to acpi_quirk_skip_serdev_enumeration() Date: Sun, 18 Feb 2024 16:15:33 +0100 Message-ID: <20240218151533.5720-3-hdegoede@redhat.com> In-Reply-To: <20240218151533.5720-1-hdegoede@redhat.com> References: <20240218151533.5720-1-hdegoede@redhat.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Some recent(ish) Dell AIO devices have a backlight controller board connected to an UART. This UART has a DELL0501 HID with CID set to PNP0501 so that the UART is still handled by 8250_pnp.c. Unfortunately there is no separate ACPI device with an UartSerialBusV2() resource to model the backlight-controller. This causes the kernel to create a /dev/ttyS0 char-device for the UART instead of creating an in kernel serdev-controller + serdev-device pair for a kernel backlight driver. Use the existing acpi_quirk_skip_serdev_enumeration() mechanism to work around this by returning skip=true for tty-ctrl parents with a HID of DELL0501. Like other cases where the UartSerialBusV2() resource is missing or broken this will only create the serdev-controller device and the serdev-device itself will need to be instantiated by platform code. Unfortunately in this case there is no device for the platform-code instantiating the serdev-device to bind to. So also create a platform_device for this. Signed-off-by: Hans de Goede --- drivers/acpi/x86/utils.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c index 185176a521ad..c7af2d2986fd 100644 --- a/drivers/acpi/x86/utils.c +++ b/drivers/acpi/x86/utils.c @@ -493,8 +493,28 @@ static int acpi_dmi_skip_serdev_enumeration(struct device *controller_parent, bo int acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *skip) { + struct acpi_device *adev = ACPI_COMPANION(controller_parent); + *skip = false; + /* + * The DELL0501 ACPI HID represents an UART (CID is set to PNP0501) with + * a backlight-controller attached. There is no separate ACPI device with + * an UartSerialBusV2() resource to model the backlight-controller. + * Set skip to true so that the tty core creates a serdev ctrl device. + * The backlight driver will manually create the serdev client device. + */ + if (acpi_dev_hid_match(adev, "DELL0501")) { + *skip = true; + /* + * Create a platform dev for dell-uart-backlight to bind to. + * This is a static device, so no need to store the result. + */ + platform_device_register_simple("dell-uart-backlight", PLATFORM_DEVID_NONE, + NULL, 0); + return 0; + } + return acpi_dmi_skip_serdev_enumeration(controller_parent, skip); } EXPORT_SYMBOL_GPL(acpi_quirk_skip_serdev_enumeration);