linux/drivers/power/reset/sc27xx-poweroff.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 Spreadtrum Communications Inc.
 * Copyright (C) 2018 Linaro Ltd.
 */

#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/syscore_ops.h>

#define SC27XX_PWR_PD_HW …
#define SC27XX_PWR_OFF_EN …
#define SC27XX_SLP_CTRL …
#define SC27XX_LDO_XTL_EN …

static struct regmap *regmap;

/*
 * On Spreadtrum platform, we need power off system through external SC27xx
 * series PMICs, and it is one similar SPI bus mapped by regmap to access PMIC,
 * which is not fast io access.
 *
 * So before stopping other cores, we need release other cores' resource by
 * taking cpus down to avoid racing regmap or spi mutex lock when poweroff
 * system through PMIC.
 */
static void sc27xx_poweroff_shutdown(void)
{ … }

static struct syscore_ops poweroff_syscore_ops = …;

static void sc27xx_poweroff_do_poweroff(void)
{ … }

static int sc27xx_poweroff_probe(struct platform_device *pdev)
{ … }

static struct platform_driver sc27xx_poweroff_driver = …;
module_platform_driver(…) …;

MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;