// SPDX-License-Identifier: GPL-2.0-or-later /* * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) * * Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/sched.h> #include <linux/pm.h> #include <linux/device.h> #include <linux/proc_fs.h> #include <linux/acpi.h> #include <linux/slab.h> #include <linux/regulator/machine.h> #include <linux/workqueue.h> #include <linux/reboot.h> #include <linux/delay.h> #ifdef CONFIG_X86 #include <asm/mpspec.h> #include <linux/dmi.h> #endif #include <linux/acpi_viot.h> #include <linux/pci.h> #include <acpi/apei.h> #include <linux/suspend.h> #include <linux/prmt.h> #include "internal.h" struct acpi_device *acpi_root; struct proc_dir_entry *acpi_root_dir; EXPORT_SYMBOL(…); #ifdef CONFIG_X86 #ifdef CONFIG_ACPI_CUSTOM_DSDT static inline int set_copy_dsdt(const struct dmi_system_id *id) { return 0; } #else static int set_copy_dsdt(const struct dmi_system_id *id) { … } #endif static const struct dmi_system_id dsdt_dmi_table[] __initconst = …; #endif /* -------------------------------------------------------------------------- Device Management -------------------------------------------------------------------------- */ acpi_status acpi_bus_get_status_handle(acpi_handle handle, unsigned long long *sta) { … } EXPORT_SYMBOL_GPL(…); int acpi_bus_get_status(struct acpi_device *device) { … } EXPORT_SYMBOL(…); void acpi_bus_private_data_handler(acpi_handle handle, void *context) { … } EXPORT_SYMBOL(…); int acpi_bus_attach_private_data(acpi_handle handle, void *data) { … } EXPORT_SYMBOL_GPL(…); int acpi_bus_get_private_data(acpi_handle handle, void **data) { … } EXPORT_SYMBOL_GPL(…); void acpi_bus_detach_private_data(acpi_handle handle) { … } EXPORT_SYMBOL_GPL(…); static void acpi_print_osc_error(acpi_handle handle, struct acpi_osc_context *context, char *error) { … } acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) { … } EXPORT_SYMBOL(…); bool osc_sb_apei_support_acked; /* * ACPI 6.0 Section 8.4.4.2 Idle State Coordination * OSPM supports platform coordinated low power idle(LPI) states */ bool osc_pc_lpi_support_confirmed; EXPORT_SYMBOL_GPL(…); /* * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities': * Starting with ACPI Specification 6.2, all _CPC registers can be in * PCC, System Memory, System IO, or Functional Fixed Hardware address * spaces. OSPM support for this more flexible register space scheme is * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit. * * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in: * - PCC or Functional Fixed Hardware address space if defined * - SystemMemory address space (NULL register) if not defined */ bool osc_cpc_flexible_adr_space_confirmed; EXPORT_SYMBOL_GPL(…); /* * ACPI 6.4 Operating System Capabilities for USB. */ bool osc_sb_native_usb4_support_confirmed; EXPORT_SYMBOL_GPL(…); bool osc_sb_cppc2_support_acked; static u8 sb_uuid_str[] = …; static void acpi_bus_osc_negotiate_platform_control(void) { … } /* * Native control of USB4 capabilities. If any of the tunneling bits is * set it means OS is in control and we use software based connection * manager. */ u32 osc_sb_native_usb4_control; EXPORT_SYMBOL_GPL(…); static void acpi_bus_decode_usb_osc(const char *msg, u32 bits) { … } static u8 sb_usb_uuid_str[] = …; static void acpi_bus_osc_negotiate_usb_control(void) { … } /* -------------------------------------------------------------------------- Notification Handling -------------------------------------------------------------------------- */ /** * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler * @handle: Target ACPI object. * @type: Notification type. * @data: Ignored. * * This only handles notifications related to device hotplug. */ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) { … } static void acpi_notify_device(acpi_handle handle, u32 event, void *data) { … } static int acpi_device_install_notify_handler(struct acpi_device *device, struct acpi_driver *acpi_drv) { … } static void acpi_device_remove_notify_handler(struct acpi_device *device, struct acpi_driver *acpi_drv) { … } int acpi_dev_install_notify_handler(struct acpi_device *adev, u32 handler_type, acpi_notify_handler handler, void *context) { … } EXPORT_SYMBOL_GPL(…); void acpi_dev_remove_notify_handler(struct acpi_device *adev, u32 handler_type, acpi_notify_handler handler) { … } EXPORT_SYMBOL_GPL(…); /* Handle events targeting \_SB device (at present only graceful shutdown) */ #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST … #define ACPI_SB_INDICATE_INTERVAL … static void sb_notify_work(struct work_struct *dummy) { … } static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) { … } static int __init acpi_setup_sb_notify_handler(void) { … } /* -------------------------------------------------------------------------- Device Matching -------------------------------------------------------------------------- */ /** * acpi_get_first_physical_node - Get first physical node of an ACPI device * @adev: ACPI device in question * * Return: First physical node of ACPI device @adev */ struct device *acpi_get_first_physical_node(struct acpi_device *adev) { … } EXPORT_SYMBOL_GPL(…); static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev, const struct device *dev) { … } /** * acpi_device_is_first_physical_node - Is given dev first physical node * @adev: ACPI companion device * @dev: Physical device to check * * Function checks if given @dev is the first physical devices attached to * the ACPI companion device. This distinction is needed in some cases * where the same companion device is shared between many physical devices. * * Note that the caller have to provide valid @adev pointer. */ bool acpi_device_is_first_physical_node(struct acpi_device *adev, const struct device *dev) { … } /* * acpi_companion_match() - Can we match via ACPI companion device * @dev: Device in question * * Check if the given device has an ACPI companion and if that companion has * a valid list of PNP IDs, and if the device is the first (primary) physical * device associated with it. Return the companion pointer if that's the case * or NULL otherwise. * * If multiple physical devices are attached to a single ACPI companion, we need * to be careful. The usage scenario for this kind of relationship is that all * of the physical devices in question use resources provided by the ACPI * companion. A typical case is an MFD device where all the sub-devices share * the parent's ACPI companion. In such cases we can only allow the primary * (first) physical device to be matched with the help of the companion's PNP * IDs. * * Additional physical devices sharing the ACPI companion can still use * resources available from it but they will be matched normally using functions * provided by their bus types (and analogously for their modalias). */ const struct acpi_device *acpi_companion_match(const struct device *dev) { … } /** * acpi_of_match_device - Match device object using the "compatible" property. * @adev: ACPI device object to match. * @of_match_table: List of device IDs to match against. * @of_id: OF ID if matched * * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of * identifiers and a _DSD object with the "compatible" property, use that * property to match against the given list of identifiers. */ static bool acpi_of_match_device(const struct acpi_device *adev, const struct of_device_id *of_match_table, const struct of_device_id **of_id) { … } static bool acpi_of_modalias(struct acpi_device *adev, char *modalias, size_t len) { … } /** * acpi_set_modalias - Set modalias using "compatible" property or supplied ID * @adev: ACPI device object to match * @default_id: ID string to use as default if no compatible string found * @modalias: Pointer to buffer that modalias value will be copied into * @len: Length of modalias buffer * * This is a counterpart of of_alias_from_compatible() for struct acpi_device * objects. If there is a compatible string for @adev, it will be copied to * @modalias with the vendor prefix stripped; otherwise, @default_id will be * used. */ void acpi_set_modalias(struct acpi_device *adev, const char *default_id, char *modalias, size_t len) { … } EXPORT_SYMBOL_GPL(…); static bool __acpi_match_device_cls(const struct acpi_device_id *id, struct acpi_hardware_id *hwid) { … } static bool __acpi_match_device(const struct acpi_device *device, const struct acpi_device_id *acpi_ids, const struct of_device_id *of_ids, const struct acpi_device_id **acpi_id, const struct of_device_id **of_id) { … } /** * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs * @ids: Array of struct acpi_device_id objects to match against. * @adev: The ACPI device pointer to match. * * Match the ACPI device @adev against a given list of ACPI IDs @ids. * * Return: * a pointer to the first matching ACPI ID on success or %NULL on failure. */ const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids, const struct acpi_device *adev) { … } EXPORT_SYMBOL_GPL(…); /** * acpi_match_device - Match a struct device against a given list of ACPI IDs * @ids: Array of struct acpi_device_id object to match against. * @dev: The device structure to match. * * Check if @dev has a valid ACPI handle and if there is a struct acpi_device * object for that handle and use that object to match against a given list of * device IDs. * * Return a pointer to the first matching ID on success or %NULL on failure. */ const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, const struct device *dev) { … } EXPORT_SYMBOL_GPL(…); static const void *acpi_of_device_get_match_data(const struct device *dev) { … } const void *acpi_device_get_match_data(const struct device *dev) { … } EXPORT_SYMBOL_GPL(…); int acpi_match_device_ids(struct acpi_device *device, const struct acpi_device_id *ids) { … } EXPORT_SYMBOL(…); bool acpi_driver_match_device(struct device *dev, const struct device_driver *drv) { … } EXPORT_SYMBOL_GPL(…); /* -------------------------------------------------------------------------- ACPI Driver Management -------------------------------------------------------------------------- */ /** * __acpi_bus_register_driver - register a driver with the ACPI bus * @driver: driver being registered * @owner: owning module/driver * * Registers a driver with the ACPI bus. Searches the namespace for all * devices that match the driver's criteria and binds. Returns zero for * success or a negative error status for failure. */ int __acpi_bus_register_driver(struct acpi_driver *driver, struct module *owner) { … } EXPORT_SYMBOL(…); /** * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus * @driver: driver to unregister * * Unregisters a driver with the ACPI bus. Searches the namespace for all * devices that match the driver's criteria and unbinds. */ void acpi_bus_unregister_driver(struct acpi_driver *driver) { … } EXPORT_SYMBOL(…); /* -------------------------------------------------------------------------- ACPI Bus operations -------------------------------------------------------------------------- */ static int acpi_bus_match(struct device *dev, const struct device_driver *drv) { … } static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env) { … } static int acpi_device_probe(struct device *dev) { … } static void acpi_device_remove(struct device *dev) { … } const struct bus_type acpi_bus_type = …; int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data) { … } EXPORT_SYMBOL_GPL(…); struct acpi_dev_walk_context { … }; static int acpi_dev_for_one_check(struct device *dev, void *context) { … } EXPORT_SYMBOL_GPL(…); int acpi_dev_for_each_child(struct acpi_device *adev, int (*fn)(struct acpi_device *, void *), void *data) { … } int acpi_dev_for_each_child_reverse(struct acpi_device *adev, int (*fn)(struct acpi_device *, void *), void *data) { … } /* -------------------------------------------------------------------------- Initialization/Cleanup -------------------------------------------------------------------------- */ static int __init acpi_bus_init_irq(void) { … } /** * acpi_early_init - Initialize ACPICA and populate the ACPI namespace. * * The ACPI tables are accessible after this, but the handling of events has not * been initialized and the global lock is not available yet, so AML should not * be executed at this point. * * Doing this before switching the EFI runtime services to virtual mode allows * the EfiBootServices memory to be freed slightly earlier on boot. */ void __init acpi_early_init(void) { … } /** * acpi_subsystem_init - Finalize the early initialization of ACPI. * * Switch over the platform to the ACPI mode (if possible). * * Doing this too early is generally unsafe, but at the same time it needs to be * done before all things that really depend on ACPI. The right spot appears to * be before finalizing the EFI initialization. */ void __init acpi_subsystem_init(void) { … } static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) { … } static int __init acpi_bus_init(void) { … } struct kobject *acpi_kobj; EXPORT_SYMBOL_GPL(…); static int __init acpi_init(void) { … } subsys_initcall(acpi_init);
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