Quelle  pm.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * loongson-specific suspend support
 *
 *  Copyright (C) 2009 Lemote Inc.
 *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
 */
#include <linux/suspend.h>
#include <linux/pm.h>

#include <asm/mipsregs.h>

#include <loongson.h>

asmlinkage void loongson_lefi_sleep(unsigned long sleep_addr);

static int lefi_pm_enter(suspend_state_t state)
{
 switch (state) {
 case PM_SUSPEND_MEM:
  pm_set_suspend_via_firmware();
  loongson_lefi_sleep(loongson_sysconf.suspend_addr);
  pm_set_resume_via_firmware();
  return 0;
 default:
  return -EINVAL;
 }
}

static int lefi_pm_valid_state(suspend_state_t state)
{
 switch (state) {
 case PM_SUSPEND_MEM:
  return !!loongson_sysconf.suspend_addr;
 default:
  return 0;
 }
}

static const struct platform_suspend_ops lefi_pm_ops = {
 .valid = lefi_pm_valid_state,
 .enter = lefi_pm_enter,
};

static int __init loongson_pm_init(void)
{
 if (loongson_sysconf.fw_interface == LOONGSON_LEFI)
  suspend_set_ops(&lefi_pm_ops);

 return 0;
}
arch_initcall(loongson_pm_init);