Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * System Control and Management Interface (SCMI) System Power Protocol
 *
 * Copyright (C) 2020 ARM Ltd.
 */
 
#define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt
 
#include <linux/module.h>
#include <linux/scmi_protocol.h>
 
#include "common.h"
#include "notify.h"
 
#define SCMI_SYSTEM_NUM_SOURCES		1
 
enum scmi_system_protocol_cmd {
<------>SYSTEM_POWER_STATE_NOTIFY = 0x5,
};
 
struct scmi_system_power_state_notify {
<------>__le32 notify_enable;
};
 
struct scmi_system_power_state_notifier_payld {
<------>__le32 agent_id;
<------>__le32 flags;
<------>__le32 system_state;
};
 
struct scmi_system_info {
<------>u32 version;
};
 
static int scmi_system_request_notify(const struct scmi_protocol_handle *ph,
<------><------><------><------>      bool enable)
{
<------>int ret;
<------>struct scmi_xfer *t;
<------>struct scmi_system_power_state_notify *notify;
 
<------>ret = ph->xops->xfer_get_init(ph, SYSTEM_POWER_STATE_NOTIFY,
<------><------><------><------>      sizeof(*notify), 0, &t);
<------>if (ret)
<------><------>return ret;
 
<------>notify = t->tx.buf;
<------>notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
 
<------>ret = ph->xops->do_xfer(ph, t);
 
<------>ph->xops->xfer_put(ph, t);
<------>return ret;
}
 
static int scmi_system_set_notify_enabled(const struct scmi_protocol_handle *ph,
<------><------><------><------><------>  u8 evt_id, u32 src_id, bool enable)
{
<------>int ret;
 
<------>ret = scmi_system_request_notify(ph, enable);
<------>if (ret)
<------><------>pr_debug("FAIL_ENABLE - evt[%X] - ret:%d\n", evt_id, ret);
 
<------>return ret;
}
 
static void *
scmi_system_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)
{
<------>const struct scmi_system_power_state_notifier_payld *p = payld;
<------>struct scmi_system_power_state_notifier_report *r = report;
 
<------>if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER ||
<------>    sizeof(*p) != payld_sz)
<------><------>return NULL;
 
<------>r->timestamp = timestamp;
<------>r->agent_id = le32_to_cpu(p->agent_id);
<------>r->flags = le32_to_cpu(p->flags);
<------>r->system_state = le32_to_cpu(p->system_state);
<------>*src_id = 0;
 
<------>return r;
}
 
static const struct scmi_event system_events[] = {
<------>{
<------><------>.id = SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER,
<------><------>.max_payld_sz =
<------><------><------>sizeof(struct scmi_system_power_state_notifier_payld),
<------><------>.max_report_sz =
<------><------><------>sizeof(struct scmi_system_power_state_notifier_report),
<------>},
};
 
static const struct scmi_event_ops system_event_ops = {
<------>.set_notify_enabled = scmi_system_set_notify_enabled,
<------>.fill_custom_report = scmi_system_fill_custom_report,
};
 
static const struct scmi_protocol_events system_protocol_events = {
<------>.queue_sz = SCMI_PROTO_QUEUE_SZ,
<------>.ops = &system_event_ops,
<------>.evts = system_events,
<------>.num_events = ARRAY_SIZE(system_events),
<------>.num_sources = SCMI_SYSTEM_NUM_SOURCES,
};
 
static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph)
{
<------>u32 version;
<------>struct scmi_system_info *pinfo;
 
<------>ph->xops->version_get(ph, &version);
 
<------>dev_dbg(ph->dev, "System Power Version %d.%d\n",
<------><------>PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
 
<------>pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
<------>if (!pinfo)
<------><------>return -ENOMEM;
 
<------>pinfo->version = version;
<------>return ph->set_priv(ph, pinfo);
}
 
static const struct scmi_protocol scmi_system = {
<------>.id = SCMI_PROTOCOL_SYSTEM,
<------>.owner = THIS_MODULE,
<------>.init_instance = &scmi_system_protocol_init,
<------>.ops = NULL,
<------>.events = &system_protocol_events,
};
 
DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(system, scmi_system)