638 lines
24 KiB
C
638 lines
24 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Surface System Aggregator Module (SSAM) bus and client-device subsystem.
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*
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* Main interface for the surface-aggregator bus, surface-aggregator client
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* devices, and respective drivers building on top of the SSAM controller.
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* Provides support for non-platform/non-ACPI SSAM clients via dedicated
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* subsystem.
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*
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* Copyright (C) 2019-2021 Maximilian Luz <luzmaximilian@gmail.com>
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*/
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#ifndef _LINUX_SURFACE_AGGREGATOR_DEVICE_H
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#define _LINUX_SURFACE_AGGREGATOR_DEVICE_H
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/property.h>
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#include <linux/types.h>
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#include <linux/surface_aggregator/controller.h>
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/* -- Surface System Aggregator Module bus. --------------------------------- */
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/**
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* enum ssam_device_domain - SAM device domain.
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* @SSAM_DOMAIN_VIRTUAL: Virtual device.
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* @SSAM_DOMAIN_SERIALHUB: Physical device connected via Surface Serial Hub.
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*/
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enum ssam_device_domain {
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SSAM_DOMAIN_VIRTUAL = 0x00,
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SSAM_DOMAIN_SERIALHUB = 0x01,
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};
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/**
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* enum ssam_virtual_tc - Target categories for the virtual SAM domain.
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* @SSAM_VIRTUAL_TC_HUB: Device hub category.
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*/
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enum ssam_virtual_tc {
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SSAM_VIRTUAL_TC_HUB = 0x00,
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};
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/**
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* struct ssam_device_uid - Unique identifier for SSAM device.
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* @domain: Domain of the device.
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* @category: Target category of the device.
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* @target: Target ID of the device.
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* @instance: Instance ID of the device.
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* @function: Sub-function of the device. This field can be used to split a
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* single SAM device into multiple virtual subdevices to separate
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* different functionality of that device and allow one driver per
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* such functionality.
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*/
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struct ssam_device_uid {
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u8 domain;
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u8 category;
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u8 target;
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u8 instance;
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u8 function;
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};
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/*
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* Special values for device matching.
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*
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* These values are intended to be used with SSAM_DEVICE(), SSAM_VDEV(), and
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* SSAM_SDEV() exclusively. Specifically, they are used to initialize the
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* match_flags member of the device ID structure. Do not use them directly
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* with struct ssam_device_id or struct ssam_device_uid.
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*/
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#define SSAM_SSH_TID_ANY 0xffff
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#define SSAM_SSH_IID_ANY 0xffff
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#define SSAM_SSH_FUN_ANY 0xffff
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/**
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* SSAM_DEVICE() - Initialize a &struct ssam_device_id with the given
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* parameters.
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* @d: Domain of the device.
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* @cat: Target category of the device.
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* @tid: Target ID of the device.
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* @iid: Instance ID of the device.
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* @fun: Sub-function of the device.
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*
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* Initializes a &struct ssam_device_id with the given parameters. See &struct
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* ssam_device_uid for details regarding the parameters. The special values
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* %SSAM_SSH_TID_ANY, %SSAM_SSH_IID_ANY, and %SSAM_SSH_FUN_ANY can be used to specify that
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* matching should ignore target ID, instance ID, and/or sub-function,
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* respectively. This macro initializes the ``match_flags`` field based on the
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* given parameters.
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*
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* Note: The parameters @d and @cat must be valid &u8 values, the parameters
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* @tid, @iid, and @fun must be either valid &u8 values or %SSAM_SSH_TID_ANY,
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* %SSAM_SSH_IID_ANY, or %SSAM_SSH_FUN_ANY, respectively. Other non-&u8 values are not
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* allowed.
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*/
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#define SSAM_DEVICE(d, cat, tid, iid, fun) \
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.match_flags = (((tid) != SSAM_SSH_TID_ANY) ? SSAM_MATCH_TARGET : 0) \
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| (((iid) != SSAM_SSH_IID_ANY) ? SSAM_MATCH_INSTANCE : 0) \
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| (((fun) != SSAM_SSH_FUN_ANY) ? SSAM_MATCH_FUNCTION : 0), \
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.domain = d, \
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.category = cat, \
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.target = __builtin_choose_expr((tid) != SSAM_SSH_TID_ANY, (tid), 0), \
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.instance = __builtin_choose_expr((iid) != SSAM_SSH_IID_ANY, (iid), 0), \
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.function = __builtin_choose_expr((fun) != SSAM_SSH_FUN_ANY, (fun), 0)
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/**
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* SSAM_VDEV() - Initialize a &struct ssam_device_id as virtual device with
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* the given parameters.
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* @cat: Target category of the device.
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* @tid: Target ID of the device.
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* @iid: Instance ID of the device.
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* @fun: Sub-function of the device.
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*
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* Initializes a &struct ssam_device_id with the given parameters in the
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* virtual domain. See &struct ssam_device_uid for details regarding the
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* parameters. The special values %SSAM_SSH_TID_ANY, %SSAM_SSH_IID_ANY, and
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* %SSAM_SSH_FUN_ANY can be used to specify that matching should ignore target ID,
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* instance ID, and/or sub-function, respectively. This macro initializes the
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* ``match_flags`` field based on the given parameters.
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*
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* Note: The parameter @cat must be a valid &u8 value, the parameters @tid,
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* @iid, and @fun must be either valid &u8 values or %SSAM_SSH_TID_ANY,
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* %SSAM_SSH_IID_ANY, or %SSAM_SSH_FUN_ANY, respectively. Other non-&u8 values are not
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* allowed.
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*/
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#define SSAM_VDEV(cat, tid, iid, fun) \
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SSAM_DEVICE(SSAM_DOMAIN_VIRTUAL, SSAM_VIRTUAL_TC_##cat, SSAM_SSH_TID_##tid, iid, fun)
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/**
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* SSAM_SDEV() - Initialize a &struct ssam_device_id as physical SSH device
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* with the given parameters.
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* @cat: Target category of the device.
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* @tid: Target ID of the device.
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* @iid: Instance ID of the device.
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* @fun: Sub-function of the device.
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*
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* Initializes a &struct ssam_device_id with the given parameters in the SSH
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* domain. See &struct ssam_device_uid for details regarding the parameters.
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* The special values %SSAM_SSH_TID_ANY, %SSAM_SSH_IID_ANY, and
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* %SSAM_SSH_FUN_ANY can be used to specify that matching should ignore target
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* ID, instance ID, and/or sub-function, respectively. This macro initializes
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* the ``match_flags`` field based on the given parameters.
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*
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* Note: The parameter @cat must be a valid &u8 value, the parameters @tid,
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* @iid, and @fun must be either valid &u8 values or %SSAM_SSH_TID_ANY,
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* %SSAM_SSH_IID_ANY, or %SSAM_SSH_FUN_ANY, respectively. Other non-&u8 values
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* are not allowed.
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*/
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#define SSAM_SDEV(cat, tid, iid, fun) \
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SSAM_DEVICE(SSAM_DOMAIN_SERIALHUB, SSAM_SSH_TC_##cat, SSAM_SSH_TID_##tid, iid, fun)
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/*
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* enum ssam_device_flags - Flags for SSAM client devices.
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* @SSAM_DEVICE_HOT_REMOVED_BIT:
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* The device has been hot-removed. Further communication with it may time
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* out and should be avoided.
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*/
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enum ssam_device_flags {
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SSAM_DEVICE_HOT_REMOVED_BIT = 0,
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};
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/**
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* struct ssam_device - SSAM client device.
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* @dev: Driver model representation of the device.
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* @ctrl: SSAM controller managing this device.
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* @uid: UID identifying the device.
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* @flags: Device state flags, see &enum ssam_device_flags.
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*/
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struct ssam_device {
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struct device dev;
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struct ssam_controller *ctrl;
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struct ssam_device_uid uid;
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unsigned long flags;
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};
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/**
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* struct ssam_device_driver - SSAM client device driver.
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* @driver: Base driver model structure.
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* @match_table: Match table specifying which devices the driver should bind to.
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* @probe: Called when the driver is being bound to a device.
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* @remove: Called when the driver is being unbound from the device.
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*/
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struct ssam_device_driver {
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struct device_driver driver;
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const struct ssam_device_id *match_table;
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int (*probe)(struct ssam_device *sdev);
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void (*remove)(struct ssam_device *sdev);
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};
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#ifdef CONFIG_SURFACE_AGGREGATOR_BUS
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extern struct bus_type ssam_bus_type;
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extern const struct device_type ssam_device_type;
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/**
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* is_ssam_device() - Check if the given device is a SSAM client device.
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* @d: The device to test the type of.
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*
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* Return: Returns %true if the specified device is of type &struct
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* ssam_device, i.e. the device type points to %ssam_device_type, and %false
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* otherwise.
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*/
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static inline bool is_ssam_device(struct device *d)
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{
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return d->type == &ssam_device_type;
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}
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#else /* CONFIG_SURFACE_AGGREGATOR_BUS */
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static inline bool is_ssam_device(struct device *d)
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{
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return false;
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}
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#endif /* CONFIG_SURFACE_AGGREGATOR_BUS */
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/**
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* to_ssam_device() - Casts the given device to a SSAM client device.
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* @d: The device to cast.
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*
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* Casts the given &struct device to a &struct ssam_device. The caller has to
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* ensure that the given device is actually enclosed in a &struct ssam_device,
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* e.g. by calling is_ssam_device().
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*
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* Return: Returns a pointer to the &struct ssam_device wrapping the given
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* device @d.
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*/
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#define to_ssam_device(d) container_of_const(d, struct ssam_device, dev)
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/**
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* to_ssam_device_driver() - Casts the given device driver to a SSAM client
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* device driver.
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* @d: The driver to cast.
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*
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* Casts the given &struct device_driver to a &struct ssam_device_driver. The
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* caller has to ensure that the given driver is actually enclosed in a
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* &struct ssam_device_driver.
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*
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* Return: Returns the pointer to the &struct ssam_device_driver wrapping the
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* given device driver @d.
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*/
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static inline
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struct ssam_device_driver *to_ssam_device_driver(struct device_driver *d)
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{
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return container_of(d, struct ssam_device_driver, driver);
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}
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const struct ssam_device_id *ssam_device_id_match(const struct ssam_device_id *table,
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const struct ssam_device_uid uid);
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const struct ssam_device_id *ssam_device_get_match(const struct ssam_device *dev);
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const void *ssam_device_get_match_data(const struct ssam_device *dev);
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struct ssam_device *ssam_device_alloc(struct ssam_controller *ctrl,
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struct ssam_device_uid uid);
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int ssam_device_add(struct ssam_device *sdev);
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void ssam_device_remove(struct ssam_device *sdev);
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/**
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* ssam_device_mark_hot_removed() - Mark the given device as hot-removed.
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* @sdev: The device to mark as hot-removed.
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*
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* Mark the device as having been hot-removed. This signals drivers using the
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* device that communication with the device should be avoided and may lead to
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* timeouts.
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*/
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static inline void ssam_device_mark_hot_removed(struct ssam_device *sdev)
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{
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dev_dbg(&sdev->dev, "marking device as hot-removed\n");
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set_bit(SSAM_DEVICE_HOT_REMOVED_BIT, &sdev->flags);
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}
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/**
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* ssam_device_is_hot_removed() - Check if the given device has been
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* hot-removed.
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* @sdev: The device to check.
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*
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* Checks if the given device has been marked as hot-removed. See
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* ssam_device_mark_hot_removed() for more details.
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*
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* Return: Returns ``true`` if the device has been marked as hot-removed.
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*/
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static inline bool ssam_device_is_hot_removed(struct ssam_device *sdev)
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{
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return test_bit(SSAM_DEVICE_HOT_REMOVED_BIT, &sdev->flags);
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}
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/**
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* ssam_device_get() - Increment reference count of SSAM client device.
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* @sdev: The device to increment the reference count of.
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*
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* Increments the reference count of the given SSAM client device by
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* incrementing the reference count of the enclosed &struct device via
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* get_device().
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*
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* See ssam_device_put() for the counter-part of this function.
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*
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* Return: Returns the device provided as input.
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*/
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static inline struct ssam_device *ssam_device_get(struct ssam_device *sdev)
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{
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return sdev ? to_ssam_device(get_device(&sdev->dev)) : NULL;
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}
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/**
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* ssam_device_put() - Decrement reference count of SSAM client device.
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* @sdev: The device to decrement the reference count of.
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*
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* Decrements the reference count of the given SSAM client device by
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* decrementing the reference count of the enclosed &struct device via
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* put_device().
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*
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* See ssam_device_get() for the counter-part of this function.
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*/
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static inline void ssam_device_put(struct ssam_device *sdev)
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{
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if (sdev)
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put_device(&sdev->dev);
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}
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/**
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* ssam_device_get_drvdata() - Get driver-data of SSAM client device.
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* @sdev: The device to get the driver-data from.
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*
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* Return: Returns the driver-data of the given device, previously set via
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* ssam_device_set_drvdata().
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*/
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static inline void *ssam_device_get_drvdata(struct ssam_device *sdev)
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{
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return dev_get_drvdata(&sdev->dev);
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}
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/**
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* ssam_device_set_drvdata() - Set driver-data of SSAM client device.
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* @sdev: The device to set the driver-data of.
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* @data: The data to set the device's driver-data pointer to.
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*/
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static inline void ssam_device_set_drvdata(struct ssam_device *sdev, void *data)
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{
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dev_set_drvdata(&sdev->dev, data);
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}
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int __ssam_device_driver_register(struct ssam_device_driver *d, struct module *o);
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void ssam_device_driver_unregister(struct ssam_device_driver *d);
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/**
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* ssam_device_driver_register() - Register a SSAM client device driver.
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* @drv: The driver to register.
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*/
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#define ssam_device_driver_register(drv) \
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__ssam_device_driver_register(drv, THIS_MODULE)
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/**
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* module_ssam_device_driver() - Helper macro for SSAM device driver
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* registration.
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* @drv: The driver managed by this module.
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*
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* Helper macro to register a SSAM device driver via module_init() and
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* module_exit(). This macro may only be used once per module and replaces the
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* aforementioned definitions.
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*/
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#define module_ssam_device_driver(drv) \
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module_driver(drv, ssam_device_driver_register, \
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ssam_device_driver_unregister)
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/* -- Helpers for controller and hub devices. ------------------------------- */
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#ifdef CONFIG_SURFACE_AGGREGATOR_BUS
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int __ssam_register_clients(struct device *parent, struct ssam_controller *ctrl,
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struct fwnode_handle *node);
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void ssam_remove_clients(struct device *dev);
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#else /* CONFIG_SURFACE_AGGREGATOR_BUS */
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static inline int __ssam_register_clients(struct device *parent, struct ssam_controller *ctrl,
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struct fwnode_handle *node)
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{
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return 0;
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}
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static inline void ssam_remove_clients(struct device *dev) {}
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#endif /* CONFIG_SURFACE_AGGREGATOR_BUS */
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/**
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* ssam_register_clients() - Register all client devices defined under the
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* given parent device.
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* @dev: The parent device under which clients should be registered.
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* @ctrl: The controller with which client should be registered.
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*
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* Register all clients that have via firmware nodes been defined as children
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* of the given (parent) device. The respective child firmware nodes will be
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* associated with the correspondingly created child devices.
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*
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* The given controller will be used to instantiate the new devices. See
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* ssam_device_add() for details.
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*
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* Return: Returns zero on success, nonzero on failure.
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*/
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static inline int ssam_register_clients(struct device *dev, struct ssam_controller *ctrl)
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{
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return __ssam_register_clients(dev, ctrl, dev_fwnode(dev));
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}
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/**
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* ssam_device_register_clients() - Register all client devices defined under
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* the given SSAM parent device.
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* @sdev: The parent device under which clients should be registered.
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*
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* Register all clients that have via firmware nodes been defined as children
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* of the given (parent) device. The respective child firmware nodes will be
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* associated with the correspondingly created child devices.
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*
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* The controller used by the parent device will be used to instantiate the new
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* devices. See ssam_device_add() for details.
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*
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* Return: Returns zero on success, nonzero on failure.
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*/
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static inline int ssam_device_register_clients(struct ssam_device *sdev)
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{
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return ssam_register_clients(&sdev->dev, sdev->ctrl);
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}
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/* -- Helpers for client-device requests. ----------------------------------- */
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/**
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* SSAM_DEFINE_SYNC_REQUEST_CL_N() - Define synchronous client-device SAM
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* request function with neither argument nor return value.
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* @name: Name of the generated function.
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* @spec: Specification (&struct ssam_request_spec_md) defining the request.
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*
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* Defines a function executing the synchronous SAM request specified by
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* @spec, with the request having neither argument nor return value. Device
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* specifying parameters are not hard-coded, but instead are provided via the
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* client device, specifically its UID, supplied when calling this function.
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* The generated function takes care of setting up the request struct, buffer
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* allocation, as well as execution of the request itself, returning once the
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* request has been fully completed. The required transport buffer will be
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* allocated on the stack.
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*
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* The generated function is defined as ``static int name(struct ssam_device
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* *sdev)``, returning the status of the request, which is zero on success and
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* negative on failure. The ``sdev`` parameter specifies both the target
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* device of the request and by association the controller via which the
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* request is sent.
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*
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* Refer to ssam_request_do_sync_onstack() for more details on the behavior of
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* the generated function.
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*/
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#define SSAM_DEFINE_SYNC_REQUEST_CL_N(name, spec...) \
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SSAM_DEFINE_SYNC_REQUEST_MD_N(__raw_##name, spec) \
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static int name(struct ssam_device *sdev) \
|
|
{ \
|
|
return __raw_##name(sdev->ctrl, sdev->uid.target, \
|
|
sdev->uid.instance); \
|
|
}
|
|
|
|
/**
|
|
* SSAM_DEFINE_SYNC_REQUEST_CL_W() - Define synchronous client-device SAM
|
|
* request function with argument.
|
|
* @name: Name of the generated function.
|
|
* @atype: Type of the request's argument.
|
|
* @spec: Specification (&struct ssam_request_spec_md) defining the request.
|
|
*
|
|
* Defines a function executing the synchronous SAM request specified by
|
|
* @spec, with the request taking an argument of type @atype and having no
|
|
* return value. Device specifying parameters are not hard-coded, but instead
|
|
* are provided via the client device, specifically its UID, supplied when
|
|
* calling this function. The generated function takes care of setting up the
|
|
* request struct, buffer allocation, as well as execution of the request
|
|
* itself, returning once the request has been fully completed. The required
|
|
* transport buffer will be allocated on the stack.
|
|
*
|
|
* The generated function is defined as ``static int name(struct ssam_device
|
|
* *sdev, const atype *arg)``, returning the status of the request, which is
|
|
* zero on success and negative on failure. The ``sdev`` parameter specifies
|
|
* both the target device of the request and by association the controller via
|
|
* which the request is sent. The request's argument is specified via the
|
|
* ``arg`` pointer.
|
|
*
|
|
* Refer to ssam_request_do_sync_onstack() for more details on the behavior of
|
|
* the generated function.
|
|
*/
|
|
#define SSAM_DEFINE_SYNC_REQUEST_CL_W(name, atype, spec...) \
|
|
SSAM_DEFINE_SYNC_REQUEST_MD_W(__raw_##name, atype, spec) \
|
|
static int name(struct ssam_device *sdev, const atype *arg) \
|
|
{ \
|
|
return __raw_##name(sdev->ctrl, sdev->uid.target, \
|
|
sdev->uid.instance, arg); \
|
|
}
|
|
|
|
/**
|
|
* SSAM_DEFINE_SYNC_REQUEST_CL_R() - Define synchronous client-device SAM
|
|
* request function with return value.
|
|
* @name: Name of the generated function.
|
|
* @rtype: Type of the request's return value.
|
|
* @spec: Specification (&struct ssam_request_spec_md) defining the request.
|
|
*
|
|
* Defines a function executing the synchronous SAM request specified by
|
|
* @spec, with the request taking no argument but having a return value of
|
|
* type @rtype. Device specifying parameters are not hard-coded, but instead
|
|
* are provided via the client device, specifically its UID, supplied when
|
|
* calling this function. The generated function takes care of setting up the
|
|
* request struct, buffer allocation, as well as execution of the request
|
|
* itself, returning once the request has been fully completed. The required
|
|
* transport buffer will be allocated on the stack.
|
|
*
|
|
* The generated function is defined as ``static int name(struct ssam_device
|
|
* *sdev, rtype *ret)``, returning the status of the request, which is zero on
|
|
* success and negative on failure. The ``sdev`` parameter specifies both the
|
|
* target device of the request and by association the controller via which
|
|
* the request is sent. The request's return value is written to the memory
|
|
* pointed to by the ``ret`` parameter.
|
|
*
|
|
* Refer to ssam_request_do_sync_onstack() for more details on the behavior of
|
|
* the generated function.
|
|
*/
|
|
#define SSAM_DEFINE_SYNC_REQUEST_CL_R(name, rtype, spec...) \
|
|
SSAM_DEFINE_SYNC_REQUEST_MD_R(__raw_##name, rtype, spec) \
|
|
static int name(struct ssam_device *sdev, rtype *ret) \
|
|
{ \
|
|
return __raw_##name(sdev->ctrl, sdev->uid.target, \
|
|
sdev->uid.instance, ret); \
|
|
}
|
|
|
|
/**
|
|
* SSAM_DEFINE_SYNC_REQUEST_CL_WR() - Define synchronous client-device SAM
|
|
* request function with argument and return value.
|
|
* @name: Name of the generated function.
|
|
* @atype: Type of the request's argument.
|
|
* @rtype: Type of the request's return value.
|
|
* @spec: Specification (&struct ssam_request_spec_md) defining the request.
|
|
*
|
|
* Defines a function executing the synchronous SAM request specified by @spec,
|
|
* with the request taking an argument of type @atype and having a return value
|
|
* of type @rtype. Device specifying parameters are not hard-coded, but instead
|
|
* are provided via the client device, specifically its UID, supplied when
|
|
* calling this function. The generated function takes care of setting up the
|
|
* request struct, buffer allocation, as well as execution of the request
|
|
* itself, returning once the request has been fully completed. The required
|
|
* transport buffer will be allocated on the stack.
|
|
*
|
|
* The generated function is defined as ``static int name(struct ssam_device
|
|
* *sdev, const atype *arg, rtype *ret)``, returning the status of the request,
|
|
* which is zero on success and negative on failure. The ``sdev`` parameter
|
|
* specifies both the target device of the request and by association the
|
|
* controller via which the request is sent. The request's argument is
|
|
* specified via the ``arg`` pointer. The request's return value is written to
|
|
* the memory pointed to by the ``ret`` parameter.
|
|
*
|
|
* Refer to ssam_request_do_sync_onstack() for more details on the behavior of
|
|
* the generated function.
|
|
*/
|
|
#define SSAM_DEFINE_SYNC_REQUEST_CL_WR(name, atype, rtype, spec...) \
|
|
SSAM_DEFINE_SYNC_REQUEST_MD_WR(__raw_##name, atype, rtype, spec) \
|
|
static int name(struct ssam_device *sdev, const atype *arg, rtype *ret) \
|
|
{ \
|
|
return __raw_##name(sdev->ctrl, sdev->uid.target, \
|
|
sdev->uid.instance, arg, ret); \
|
|
}
|
|
|
|
|
|
/* -- Helpers for client-device notifiers. ---------------------------------- */
|
|
|
|
/**
|
|
* ssam_device_notifier_register() - Register an event notifier for the
|
|
* specified client device.
|
|
* @sdev: The device the notifier should be registered on.
|
|
* @n: The event notifier to register.
|
|
*
|
|
* Register an event notifier. Increment the usage counter of the associated
|
|
* SAM event if the notifier is not marked as an observer. If the event is not
|
|
* marked as an observer and is currently not enabled, it will be enabled
|
|
* during this call. If the notifier is marked as an observer, no attempt will
|
|
* be made at enabling any event and no reference count will be modified.
|
|
*
|
|
* Notifiers marked as observers do not need to be associated with one specific
|
|
* event, i.e. as long as no event matching is performed, only the event target
|
|
* category needs to be set.
|
|
*
|
|
* Return: Returns zero on success, %-ENOSPC if there have already been
|
|
* %INT_MAX notifiers for the event ID/type associated with the notifier block
|
|
* registered, %-ENOMEM if the corresponding event entry could not be
|
|
* allocated, %-ENODEV if the device is marked as hot-removed. If this is the
|
|
* first time that a notifier block is registered for the specific associated
|
|
* event, returns the status of the event-enable EC-command.
|
|
*/
|
|
static inline int ssam_device_notifier_register(struct ssam_device *sdev,
|
|
struct ssam_event_notifier *n)
|
|
{
|
|
/*
|
|
* Note that this check does not provide any guarantees whatsoever as
|
|
* hot-removal could happen at any point and we can't protect against
|
|
* it. Nevertheless, if we can detect hot-removal, bail early to avoid
|
|
* communication timeouts.
|
|
*/
|
|
if (ssam_device_is_hot_removed(sdev))
|
|
return -ENODEV;
|
|
|
|
return ssam_notifier_register(sdev->ctrl, n);
|
|
}
|
|
|
|
/**
|
|
* ssam_device_notifier_unregister() - Unregister an event notifier for the
|
|
* specified client device.
|
|
* @sdev: The device the notifier has been registered on.
|
|
* @n: The event notifier to unregister.
|
|
*
|
|
* Unregister an event notifier. Decrement the usage counter of the associated
|
|
* SAM event if the notifier is not marked as an observer. If the usage counter
|
|
* reaches zero, the event will be disabled.
|
|
*
|
|
* In case the device has been marked as hot-removed, the event will not be
|
|
* disabled on the EC, as in those cases any attempt at doing so may time out.
|
|
*
|
|
* Return: Returns zero on success, %-ENOENT if the given notifier block has
|
|
* not been registered on the controller. If the given notifier block was the
|
|
* last one associated with its specific event, returns the status of the
|
|
* event-disable EC-command.
|
|
*/
|
|
static inline int ssam_device_notifier_unregister(struct ssam_device *sdev,
|
|
struct ssam_event_notifier *n)
|
|
{
|
|
return __ssam_notifier_unregister(sdev->ctrl, n,
|
|
!ssam_device_is_hot_removed(sdev));
|
|
}
|
|
|
|
#endif /* _LINUX_SURFACE_AGGREGATOR_DEVICE_H */
|