// SPDX-License-Identifier: GPL-2.0-only/* * AB8500 system control driver * * Copyright (C) ST-Ericsson SA 2010 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson. */ #include <linux/err.h>#include <linux/init.h>#include <linux/export.h>#include <linux/platform_device.h>#include <linux/pm.h>#include <linux/reboot.h>#include <linux/signal.h>#include <linux/power_supply.h>#include <linux/mfd/abx500.h>#include <linux/mfd/abx500/ab8500.h>#include <linux/mfd/abx500/ab8500-sysctrl.h> /* RtcCtrl bits */#define AB8500_ALARM_MIN_LOW  0x08#define AB8500_ALARM_MIN_MID 0x09#define RTC_CTRL 0x0B#define RTC_ALARM_ENABLE 0x4 static struct device *sysctrl_dev; static void ab8500_power_off(void){	sigset_t old;	sigset_t all;	static const char * const pss[] = {"ab8500_ac", "ab8500_usb"};	int i;	bool charger_present = false;	union power_supply_propval val;	struct power_supply *psy;	int ret; 	if (sysctrl_dev == NULL) {		pr_err("%s: sysctrl not initialized\n", __func__);		return;	} 	/*	 * If we have a charger connected and we're powering off,	 * reboot into charge-only mode.	 */ 	for (i = 0; i < ARRAY_SIZE(pss); i++) {		psy = power_supply_get_by_name(pss[i]);		if (!psy)			continue; 		ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,				&val);		power_supply_put(psy); 		if (!ret && val.intval) {			charger_present = true;			break;		}	} 	if (!charger_present)		goto shutdown; 	/* Check if battery is known */	psy = power_supply_get_by_name("ab8500_btemp");	if (psy) {		ret = power_supply_get_property(psy,				POWER_SUPPLY_PROP_TECHNOLOGY, &val);		if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {			pr_info("Charger '%s' is connected with known battery",				pss[i]);			pr_info(" - Rebooting.\n");			machine_restart("charging");		}		power_supply_put(psy);	} shutdown:	sigfillset(&all); 	if (!sigprocmask(SIG_BLOCK, &all, &old)) {		(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,					 AB8500_STW4500CTRL1_SWOFF |					 AB8500_STW4500CTRL1_SWRESET4500N);		(void)sigprocmask(SIG_SETMASK, &old, NULL);	}} static inline bool valid_bank(u8 bank){	return ((bank == AB8500_SYS_CTRL1_BLOCK) ||		(bank == AB8500_SYS_CTRL2_BLOCK));} int ab8500_sysctrl_read(u16 reg, u8 *value){	u8 bank; 	if (sysctrl_dev == NULL)		return -EPROBE_DEFER; 	bank = (reg >> 8);	if (!valid_bank(bank))		return -EINVAL; 	return abx500_get_register_interruptible(sysctrl_dev, bank,		(u8)(reg & 0xFF), value);}EXPORT_SYMBOL(ab8500_sysctrl_read); int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value){	u8 bank; 	if (sysctrl_dev == NULL)		return -EPROBE_DEFER; 	bank = (reg >> 8);	if (!valid_bank(bank)) {		pr_err("invalid bank\n");		return -EINVAL;	} 	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,		(u8)(reg & 0xFF), mask, value);}EXPORT_SYMBOL(ab8500_sysctrl_write); static int ab8500_sysctrl_probe(struct platform_device *pdev){	sysctrl_dev = &pdev->dev; 	if (!pm_power_off)		pm_power_off = ab8500_power_off; 	return 0;} static void ab8500_sysctrl_remove(struct platform_device *pdev){	sysctrl_dev = NULL; 	if (pm_power_off == ab8500_power_off)		pm_power_off = NULL;} static const struct of_device_id ab8500_sysctrl_match[] = {	{ .compatible = "stericsson,ab8500-sysctrl", },	{}}; static struct platform_driver ab8500_sysctrl_driver = {	.driver = {		.name = "ab8500-sysctrl",		.of_match_table = ab8500_sysctrl_match,	},	.probe = ab8500_sysctrl_probe,	.remove = ab8500_sysctrl_remove,}; static int __init ab8500_sysctrl_init(void){	return platform_driver_register(&ab8500_sysctrl_driver);}arch_initcall(ab8500_sysctrl_init);