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/* SPDX-License-Identifier: GPL-2.0 */
/*
* System Control and Management Interface (SCMI) Message Protocol
* notification header file containing some definitions, structures
* and function prototypes related to SCMI Notification handling.
*
* Copyright (C) 2020-2021 ARM Ltd.
*/
#ifndef _SCMI_NOTIFY_H
#define _SCMI_NOTIFY_H
#include <linux/device.h>
#include <linux/ktime.h>
#include <linux/types.h>
#define SCMI_PROTO_QUEUE_SZ 4096
/**
* struct scmi_event - Describes an event to be supported
* @id: Event ID
* @max_payld_sz: Max possible size for the payload of a notification message
* @max_report_sz: Max possible size for the report of a notification message
*
* Each SCMI protocol, during its initialization phase, can describe the events
* it wishes to support in a few struct scmi_event and pass them to the core
* using scmi_register_protocol_events().
*/
struct scmi_event {
u8 id;
size_t max_payld_sz;
size_t max_report_sz;
};
struct scmi_protocol_handle;
/**
* struct scmi_event_ops - Protocol helpers called by the notification core.
* @is_notify_supported: Return 0 if the specified notification for the
* specified resource (src_id) is supported.
* @get_num_sources: Returns the number of possible events' sources for this
* protocol
* @set_notify_enabled: Enable/disable the required evt_id/src_id notifications
* using the proper custom protocol commands.
* Return 0 on Success
* @fill_custom_report: fills a custom event report from the provided
* event message payld identifying the event
* specific src_id.
* Return NULL on failure otherwise @report now fully
* populated
*
* Context: Helpers described in &struct scmi_event_ops are called only in
* process context.
*/
struct scmi_event_ops {
bool (*is_notify_supported)(const struct scmi_protocol_handle *ph,
u8 evt_id, u32 src_id);
int (*get_num_sources)(const struct scmi_protocol_handle *ph);
int (*set_notify_enabled)(const struct scmi_protocol_handle *ph,
u8 evt_id, u32 src_id, bool enabled);
void *(*fill_custom_report)(const struct scmi_protocol_handle *ph,
u8 evt_id, ktime_t timestamp,
const void *payld, size_t payld_sz,
void *report, u32 *src_id);
};
/**
* struct scmi_protocol_events - Per-protocol description of available events
* @queue_sz: Size in bytes of the per-protocol queue to use.
* @ops: Array of protocol-specific events operations.
* @evts: Array of supported protocol's events.
* @num_events: Number of supported protocol's events described in @evts.
* @num_sources: Number of protocol's sources, should be greater than 0; if not
* available at compile time, it will be provided at run-time via
* @get_num_sources.
*/
struct scmi_protocol_events {
size_t queue_sz;
const struct scmi_event_ops *ops;
const struct scmi_event *evts;
unsigned int num_events;
unsigned int num_sources;
};
int scmi_notification_init(struct scmi_handle *handle);
void scmi_notification_exit(struct scmi_handle *handle);
int scmi_register_protocol_events(const struct scmi_handle *handle, u8 proto_id,
const struct scmi_protocol_handle *ph,
const struct scmi_protocol_events *ee);
void scmi_deregister_protocol_events(const struct scmi_handle *handle,
u8 proto_id);
int scmi_notify(const struct scmi_handle *handle, u8 proto_id, u8 evt_id,
const void *buf, size_t len, ktime_t ts);
#endif /* _SCMI_NOTIFY_H */
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