[linux-2.6-block.git] / drivers / mfd / ab8500-sysctrl.c

// 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);
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* AB8500 system control driver
	4	*
	5	* Copyright (C) ST-Ericsson SA 2010
	6	* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
	7	*/
	8
	9	#include <linux/err.h>
	10	#include <linux/init.h>
	11	#include <linux/export.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/pm.h>
	14	#include <linux/reboot.h>
	15	#include <linux/signal.h>
	16	#include <linux/power_supply.h>
	17	#include <linux/mfd/abx500.h>
	18	#include <linux/mfd/abx500/ab8500.h>
	19	#include <linux/mfd/abx500/ab8500-sysctrl.h>
	20
	21	/* RtcCtrl bits */
	22	#define AB8500_ALARM_MIN_LOW 0x08
	23	#define AB8500_ALARM_MIN_MID 0x09
	24	#define RTC_CTRL 0x0B
	25	#define RTC_ALARM_ENABLE 0x4
	26
	27	static struct device *sysctrl_dev;
	28
	29	static void ab8500_power_off(void)
	30	{
	31	sigset_t old;
	32	sigset_t all;
	33	static const char * const pss[] = {"ab8500_ac", "ab8500_usb"};
	34	int i;
	35	bool charger_present = false;
	36	union power_supply_propval val;
	37	struct power_supply *psy;
	38	int ret;
	39
	40	if (sysctrl_dev == NULL) {
	41	pr_err("%s: sysctrl not initialized\n", __func__);
	42	return;
	43	}
	44
	45	/*
	46	* If we have a charger connected and we're powering off,
	47	* reboot into charge-only mode.
	48	*/
	49
	50	for (i = 0; i < ARRAY_SIZE(pss); i++) {
	51	psy = power_supply_get_by_name(pss[i]);
	52	if (!psy)
	53	continue;
	54
	55	ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
	56	&val);
	57	power_supply_put(psy);
	58
	59	if (!ret && val.intval) {
	60	charger_present = true;
	61	break;
	62	}
	63	}
	64
	65	if (!charger_present)
	66	goto shutdown;
	67
	68	/* Check if battery is known */
	69	psy = power_supply_get_by_name("ab8500_btemp");
	70	if (psy) {
	71	ret = power_supply_get_property(psy,
	72	POWER_SUPPLY_PROP_TECHNOLOGY, &val);
	73	if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
	74	pr_info("Charger '%s' is connected with known battery",
	75	pss[i]);
	76	pr_info(" - Rebooting.\n");
	77	machine_restart("charging");
	78	}
	79	power_supply_put(psy);
	80	}
	81
	82	shutdown:
	83	sigfillset(&all);
	84
	85	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
	86	(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
	87	AB8500_STW4500CTRL1_SWOFF \|
	88	AB8500_STW4500CTRL1_SWRESET4500N);
	89	(void)sigprocmask(SIG_SETMASK, &old, NULL);
	90	}
	91	}
	92
	93	static inline bool valid_bank(u8 bank)
	94	{
	95	return ((bank == AB8500_SYS_CTRL1_BLOCK) \|\|
	96	(bank == AB8500_SYS_CTRL2_BLOCK));
	97	}
	98
	99	int ab8500_sysctrl_read(u16 reg, u8 *value)
	100	{
	101	u8 bank;
	102
	103	if (sysctrl_dev == NULL)
	104	return -EPROBE_DEFER;
	105
	106	bank = (reg >> 8);
	107	if (!valid_bank(bank))
	108	return -EINVAL;
	109
	110	return abx500_get_register_interruptible(sysctrl_dev, bank,
	111	(u8)(reg & 0xFF), value);
	112	}
	113	EXPORT_SYMBOL(ab8500_sysctrl_read);
	114
	115	int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
	116	{
	117	u8 bank;
	118
	119	if (sysctrl_dev == NULL)
	120	return -EPROBE_DEFER;
	121
	122	bank = (reg >> 8);
	123	if (!valid_bank(bank)) {
	124	pr_err("invalid bank\n");
	125	return -EINVAL;
	126	}
	127
	128	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
	129	(u8)(reg & 0xFF), mask, value);
	130	}
	131	EXPORT_SYMBOL(ab8500_sysctrl_write);
	132
	133	static int ab8500_sysctrl_probe(struct platform_device *pdev)
	134	{
	135	sysctrl_dev = &pdev->dev;
	136
	137	if (!pm_power_off)
	138	pm_power_off = ab8500_power_off;
	139
	140	return 0;
	141	}
	142
	143	static void ab8500_sysctrl_remove(struct platform_device *pdev)
	144	{
	145	sysctrl_dev = NULL;
	146
	147	if (pm_power_off == ab8500_power_off)
	148	pm_power_off = NULL;
	149	}
	150
	151	static const struct of_device_id ab8500_sysctrl_match[] = {
	152	{ .compatible = "stericsson,ab8500-sysctrl", },
	153	{}
	154	};
	155
	156	static struct platform_driver ab8500_sysctrl_driver = {
	157	.driver = {
	158	.name = "ab8500-sysctrl",
	159	.of_match_table = ab8500_sysctrl_match,
	160	},
	161	.probe = ab8500_sysctrl_probe,
	162	.remove = ab8500_sysctrl_remove,
	163	};
	164
	165	static int __init ab8500_sysctrl_init(void)
	166	{
	167	return platform_driver_register(&ab8500_sysctrl_driver);
	168	}
	169	arch_initcall(ab8500_sysctrl_init);