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Wysocki" , Len Brown , Maximilian Luz , Lee Chun-Yi , "Shyam Sundar S K" , Corentin Chary , "Luke D . Jones" , Ike Panhc , Henrique de Moraes Holschuh , "Alexis Belmonte" , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Ai Chao , Gergo Koteles , open list , "open list:ACPI" , "open list:MICROSOFT SURFACE PLATFORM PROFILE DRIVER" , "open list:THINKPAD ACPI EXTRAS DRIVER" , Mark Pearson , Matthew Schwartz , Mario Limonciello Subject: [PATCH v5 20/20] Documentation: Add documentation about class interface for platform profiles Date: Thu, 7 Nov 2024 00:02:54 -0600 Message-ID: <20241107060254.17615-21-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241107060254.17615-1-mario.limonciello@amd.com> References: <20241107060254.17615-1-mario.limonciello@amd.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF00000144:EE_|CH3PR12MB7521:EE_ X-MS-Office365-Filtering-Correlation-Id: 0bf4ad12-8653-4c40-d710-08dcfef1f9d1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|1800799024|36860700013|376014|7416014|82310400026; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(1800799024)(36860700013)(376014)(7416014)(82310400026); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2024 06:04:01.0370 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0bf4ad12-8653-4c40-d710-08dcfef1f9d1 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000144.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7521 The class interface allows changing multiple platform profiles on a system to different values. The semantics of it are similar to the legacy interface. Tested-by: Mark Pearson Signed-off-by: Mario Limonciello --- v5: * Fix some typos --- .../ABI/testing/sysfs-platform_profile | 5 ++++ .../userspace-api/sysfs-platform_profile.rst | 28 +++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-platform_profile b/Documentation/ABI/testing/sysfs-platform_profile index baf1d125f9f83..125324ab53a96 100644 --- a/Documentation/ABI/testing/sysfs-platform_profile +++ b/Documentation/ABI/testing/sysfs-platform_profile @@ -33,3 +33,8 @@ Description: Reading this file gives the current selected profile for this source such as e.g. a hotkey triggered profile change handled either directly by the embedded-controller or fully handled inside the kernel. + + This file may also emit the string 'custom' to indicate + that multiple platform profiles drivers are in use but + have different values. This string can not be written to + this interface and is solely for informational purposes. diff --git a/Documentation/userspace-api/sysfs-platform_profile.rst b/Documentation/userspace-api/sysfs-platform_profile.rst index 4fccde2e45639..b746c30432753 100644 --- a/Documentation/userspace-api/sysfs-platform_profile.rst +++ b/Documentation/userspace-api/sysfs-platform_profile.rst @@ -40,3 +40,31 @@ added. Drivers which wish to introduce new profile names must: 1. Explain why the existing profile names cannot be used. 2. Add the new profile name, along with a clear description of the expected behaviour, to the sysfs-platform_profile ABI documentation. + +Multiple driver support +======================= +When multiple drivers on a system advertise a platform profile handler, the +platform profile handler core will only advertise the profiles that are +common between all drivers to the ``/sys/firmware/acpi`` interfaces. + +This is to ensure there is no ambiguity on what the profile names mean when +all handlers don't support a profile. + +Individual drivers will register a 'platform_profile' class device that has +similar semantics as the ``/sys/firmware/acpi/platform_profile`` interface. + +To discover available profiles from the class interface the user can read the +``choices`` attribute. + +If a user wants to select a profile for a specific driver, they can do so +by writing to the ``profile`` attribute of the driver's class device. + +This will allow users to set different profiles for different drivers on the +same system. If the selected profile by individual drivers differs the +platform profile handler core will display the profile 'custom' to indicate +that the profiles are not the same. + +While the ``platform_profile`` attribute has the value ``custom``, writing a +common profile from ``platform_profile_choices`` to the platform_profile +attribute of the platform profile handler core will set the profile for all +drivers.