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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017-2026 Morse Micro
*/
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include "hif.h"
#include "skbq.h"
#include "mac.h"
#include "bus.h"
#include "ps.h"
static void mm81x_ps_wakeup(struct mm81x_ps *mps)
{
struct mm81x *mors = container_of(mps, struct mm81x, ps);
if (!mps->enable || !mps->suspended)
return;
mm81x_set_bus_enable(mors, true);
mps->suspended = false;
}
static void mm81x_ps_sleep(struct mm81x_ps *mps)
{
struct mm81x *mors = container_of(mps, struct mm81x, ps);
if (!mps->enable || mps->suspended)
return;
mps->suspended = true;
mm81x_set_bus_enable(mors, false);
}
static void mm81x_ps_evaluate(struct mm81x_ps *mps)
{
struct mm81x *mors = container_of(mps, struct mm81x, ps);
bool needs_wake = false;
unsigned long flags_on_entry =
(mors->hif.event_flags &
~BIT(MM81X_HIF_EVT_DATA_TRAFFIC_PAUSE_PEND));
if (!mps->enable)
return;
needs_wake = (mps->wakers > 0);
needs_wake |= (flags_on_entry > 0);
needs_wake |= (mm81x_hif_get_tx_buffered_count(mors) > 0);
if (needs_wake) {
mm81x_ps_wakeup(mps);
return;
}
mm81x_ps_sleep(mps);
}
static void mm81x_ps_evaluate_work(struct work_struct *work)
{
struct mm81x_ps *mps =
container_of(work, struct mm81x_ps, delayed_eval_work.work);
if (mps->enable) {
mutex_lock(&mps->lock);
mm81x_ps_evaluate(mps);
mutex_unlock(&mps->lock);
}
}
void mm81x_ps_enable(struct mm81x *mors)
{
struct mm81x_ps *mps = &mors->ps;
if (mps->enable) {
mutex_lock(&mps->lock);
if (mps->wakers == 0) {
WARN_ON_ONCE(1);
} else {
mps->wakers--;
mm81x_ps_evaluate(mps);
}
mutex_unlock(&mps->lock);
}
}
void mm81x_ps_disable(struct mm81x *mors)
{
struct mm81x_ps *mps = &mors->ps;
if (mps->enable) {
mutex_lock(&mps->lock);
mps->wakers++;
mm81x_ps_evaluate(mps);
mutex_unlock(&mps->lock);
}
}
int mm81x_ps_init(struct mm81x *mors)
{
struct mm81x_ps *mps = &mors->ps;
mps->enable = (mors->bus_type == MM81X_BUS_TYPE_USB);
mps->suspended = true;
mps->wakers = 1; /* we default to being on */
mutex_init(&mps->lock);
INIT_DELAYED_WORK(&mps->delayed_eval_work, mm81x_ps_evaluate_work);
return 0;
}
void mm81x_ps_finish(struct mm81x *mors)
{
struct mm81x_ps *mps = &mors->ps;
if (mps->enable) {
mps->enable = false;
cancel_delayed_work_sync(&mps->delayed_eval_work);
}
}
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