286 lines
8.6 KiB
C
286 lines
8.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Main SSAM/SSH controller structure and functionality.
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*
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* Copyright (C) 2019-2022 Maximilian Luz <luzmaximilian@gmail.com>
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*/
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#ifndef _SURFACE_AGGREGATOR_CONTROLLER_H
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#define _SURFACE_AGGREGATOR_CONTROLLER_H
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rbtree.h>
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#include <linux/rwsem.h>
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#include <linux/serdev.h>
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#include <linux/spinlock.h>
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#include <linux/srcu.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include <linux/surface_aggregator/controller.h>
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#include <linux/surface_aggregator/serial_hub.h>
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#include "ssh_request_layer.h"
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/* -- Safe counters. -------------------------------------------------------- */
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/**
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* struct ssh_seq_counter - Safe counter for SSH sequence IDs.
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* @value: The current counter value.
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*/
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struct ssh_seq_counter {
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u8 value;
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};
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/**
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* struct ssh_rqid_counter - Safe counter for SSH request IDs.
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* @value: The current counter value.
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*/
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struct ssh_rqid_counter {
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u16 value;
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};
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/* -- Event/notification system. -------------------------------------------- */
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/**
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* struct ssam_nf_head - Notifier head for SSAM events.
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* @srcu: The SRCU struct for synchronization.
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* @head: List-head for notifier blocks registered under this head.
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*/
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struct ssam_nf_head {
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struct srcu_struct srcu;
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struct list_head head;
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};
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/**
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* struct ssam_nf - Notifier callback- and activation-registry for SSAM events.
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* @lock: Lock guarding (de-)registration of notifier blocks. Note: This
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* lock does not need to be held for notifier calls, only
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* registration and deregistration.
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* @refcount: The root of the RB-tree used for reference-counting enabled
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* events/notifications.
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* @head: The list of notifier heads for event/notification callbacks.
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*/
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struct ssam_nf {
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struct mutex lock;
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struct rb_root refcount;
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struct ssam_nf_head head[SSH_NUM_EVENTS];
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};
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/* -- Event/async request completion system. -------------------------------- */
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struct ssam_cplt;
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/**
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* struct ssam_event_item - Struct for event queuing and completion.
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* @node: The node in the queue.
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* @rqid: The request ID of the event.
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* @ops: Instance specific functions.
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* @ops.free: Callback for freeing this event item.
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* @event: Actual event data.
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*/
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struct ssam_event_item {
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struct list_head node;
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u16 rqid;
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struct {
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void (*free)(struct ssam_event_item *event);
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} ops;
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struct ssam_event event; /* must be last */
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};
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/**
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* struct ssam_event_queue - Queue for completing received events.
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* @cplt: Reference to the completion system on which this queue is active.
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* @lock: The lock for any operation on the queue.
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* @head: The list-head of the queue.
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* @work: The &struct work_struct performing completion work for this queue.
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*/
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struct ssam_event_queue {
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struct ssam_cplt *cplt;
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spinlock_t lock;
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struct list_head head;
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struct work_struct work;
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};
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/**
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* struct ssam_event_target - Set of queues for a single SSH target ID.
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* @queue: The array of queues, one queue per event ID.
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*/
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struct ssam_event_target {
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struct ssam_event_queue queue[SSH_NUM_EVENTS];
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};
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/**
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* struct ssam_cplt - SSAM event/async request completion system.
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* @dev: The device with which this system is associated. Only used
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* for logging.
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* @wq: The &struct workqueue_struct on which all completion work
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* items are queued.
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* @event: Event completion management.
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* @event.target: Array of &struct ssam_event_target, one for each target.
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* @event.notif: Notifier callbacks and event activation reference counting.
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*/
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struct ssam_cplt {
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struct device *dev;
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struct workqueue_struct *wq;
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struct {
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struct ssam_event_target target[SSH_NUM_TARGETS];
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struct ssam_nf notif;
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} event;
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};
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/* -- Main SSAM device structures. ------------------------------------------ */
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/**
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* enum ssam_controller_state - State values for &struct ssam_controller.
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* @SSAM_CONTROLLER_UNINITIALIZED:
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* The controller has not been initialized yet or has been deinitialized.
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* @SSAM_CONTROLLER_INITIALIZED:
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* The controller is initialized, but has not been started yet.
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* @SSAM_CONTROLLER_STARTED:
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* The controller has been started and is ready to use.
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* @SSAM_CONTROLLER_STOPPED:
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* The controller has been stopped.
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* @SSAM_CONTROLLER_SUSPENDED:
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* The controller has been suspended.
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*/
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enum ssam_controller_state {
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SSAM_CONTROLLER_UNINITIALIZED,
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SSAM_CONTROLLER_INITIALIZED,
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SSAM_CONTROLLER_STARTED,
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SSAM_CONTROLLER_STOPPED,
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SSAM_CONTROLLER_SUSPENDED,
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};
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/**
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* struct ssam_controller_caps - Controller device capabilities.
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* @ssh_power_profile: SSH power profile.
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* @ssh_buffer_size: SSH driver UART buffer size.
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* @screen_on_sleep_idle_timeout: SAM UART screen-on sleep idle timeout.
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* @screen_off_sleep_idle_timeout: SAM UART screen-off sleep idle timeout.
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* @d3_closes_handle: SAM closes UART handle in D3.
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*
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* Controller and SSH device capabilities found in ACPI.
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*/
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struct ssam_controller_caps {
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u32 ssh_power_profile;
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u32 ssh_buffer_size;
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u32 screen_on_sleep_idle_timeout;
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u32 screen_off_sleep_idle_timeout;
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u32 d3_closes_handle:1;
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};
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/**
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* struct ssam_controller - SSAM controller device.
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* @kref: Reference count of the controller.
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* @lock: Main lock for the controller, used to guard state changes.
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* @state: Controller state.
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* @rtl: Request transport layer for SSH I/O.
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* @cplt: Completion system for SSH/SSAM events and asynchronous requests.
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* @counter: Safe SSH message ID counters.
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* @counter.seq: Sequence ID counter.
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* @counter.rqid: Request ID counter.
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* @irq: Wakeup IRQ resources.
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* @irq.num: The wakeup IRQ number.
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* @irq.wakeup_enabled: Whether wakeup by IRQ is enabled during suspend.
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* @caps: The controller device capabilities.
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*/
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struct ssam_controller {
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struct kref kref;
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struct rw_semaphore lock;
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enum ssam_controller_state state;
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struct ssh_rtl rtl;
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struct ssam_cplt cplt;
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struct {
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struct ssh_seq_counter seq;
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struct ssh_rqid_counter rqid;
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} counter;
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struct {
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int num;
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bool wakeup_enabled;
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} irq;
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struct ssam_controller_caps caps;
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};
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#define to_ssam_controller(ptr, member) \
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container_of(ptr, struct ssam_controller, member)
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#define ssam_dbg(ctrl, fmt, ...) rtl_dbg(&(ctrl)->rtl, fmt, ##__VA_ARGS__)
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#define ssam_info(ctrl, fmt, ...) rtl_info(&(ctrl)->rtl, fmt, ##__VA_ARGS__)
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#define ssam_warn(ctrl, fmt, ...) rtl_warn(&(ctrl)->rtl, fmt, ##__VA_ARGS__)
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#define ssam_err(ctrl, fmt, ...) rtl_err(&(ctrl)->rtl, fmt, ##__VA_ARGS__)
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/**
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* ssam_controller_receive_buf() - Provide input-data to the controller.
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* @ctrl: The controller.
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* @buf: The input buffer.
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* @n: The number of bytes in the input buffer.
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*
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* Provide input data to be evaluated by the controller, which has been
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* received via the lower-level transport.
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*
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* Return: Returns the number of bytes consumed, or, if the packet transport
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* layer of the controller has been shut down, %-ESHUTDOWN.
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*/
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static inline
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int ssam_controller_receive_buf(struct ssam_controller *ctrl,
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const unsigned char *buf, size_t n)
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{
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return ssh_ptl_rx_rcvbuf(&ctrl->rtl.ptl, buf, n);
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}
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/**
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* ssam_controller_write_wakeup() - Notify the controller that the underlying
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* device has space available for data to be written.
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* @ctrl: The controller.
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*/
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static inline void ssam_controller_write_wakeup(struct ssam_controller *ctrl)
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{
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ssh_ptl_tx_wakeup_transfer(&ctrl->rtl.ptl);
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}
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int ssam_controller_init(struct ssam_controller *ctrl, struct serdev_device *s);
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int ssam_controller_start(struct ssam_controller *ctrl);
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void ssam_controller_shutdown(struct ssam_controller *ctrl);
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void ssam_controller_destroy(struct ssam_controller *ctrl);
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int ssam_notifier_disable_registered(struct ssam_controller *ctrl);
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void ssam_notifier_restore_registered(struct ssam_controller *ctrl);
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int ssam_irq_setup(struct ssam_controller *ctrl);
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void ssam_irq_free(struct ssam_controller *ctrl);
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int ssam_irq_arm_for_wakeup(struct ssam_controller *ctrl);
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void ssam_irq_disarm_wakeup(struct ssam_controller *ctrl);
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void ssam_controller_lock(struct ssam_controller *c);
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void ssam_controller_unlock(struct ssam_controller *c);
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int ssam_get_firmware_version(struct ssam_controller *ctrl, u32 *version);
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int ssam_ctrl_notif_display_off(struct ssam_controller *ctrl);
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int ssam_ctrl_notif_display_on(struct ssam_controller *ctrl);
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int ssam_ctrl_notif_d0_exit(struct ssam_controller *ctrl);
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int ssam_ctrl_notif_d0_entry(struct ssam_controller *ctrl);
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int ssam_controller_suspend(struct ssam_controller *ctrl);
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int ssam_controller_resume(struct ssam_controller *ctrl);
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int ssam_event_item_cache_init(void);
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void ssam_event_item_cache_destroy(void);
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#endif /* _SURFACE_AGGREGATOR_CONTROLLER_H */
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