[linux-2.6-block.git] / drivers / mfd / rn5t618.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * MFD core driver for Ricoh RN5T618 PMIC
 *
 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
 * Copyright (C) 2016 Toradex AG
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>

static const struct mfd_cell rn5t618_cells[] = {
	{ .name = "rn5t618-regulator" },
	{ .name = "rn5t618-wdt" },
};

static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case RN5T618_WATCHDOGCNT:
	case RN5T618_DCIRQ:
	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	case RN5T618_IR_GPR:
	case RN5T618_IR_GPF:
	case RN5T618_MON_IOIN:
	case RN5T618_INTMON:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config rn5t618_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.volatile_reg	= rn5t618_volatile_reg,
	.max_register	= RN5T618_MAX_REG,
	.cache_type	= REGCACHE_RBTREE,
};

static struct rn5t618 *rn5t618_pm_power_off;
static struct notifier_block rn5t618_restart_handler;

static void rn5t618_trigger_poweroff_sequence(bool repower)
{
	/* disable automatic repower-on */
	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
			   RN5T618_REPCNT_REPWRON,
			   repower ? RN5T618_REPCNT_REPWRON : 0);
	/* start power-off sequence */
	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
			   RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
}

static void rn5t618_power_off(void)
{
	rn5t618_trigger_poweroff_sequence(false);
}

static int rn5t618_restart(struct notifier_block *this,
			    unsigned long mode, void *cmd)
{
	rn5t618_trigger_poweroff_sequence(true);

	/*
	 * Re-power factor detection on PMIC side is not instant. 1ms
	 * proved to be enough time until reset takes effect.
	 */
	mdelay(1);

	return NOTIFY_DONE;
}

static const struct of_device_id rn5t618_of_match[] = {
	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
	{ }
};
MODULE_DEVICE_TABLE(of, rn5t618_of_match);

static int rn5t618_i2c_probe(struct i2c_client *i2c,
			     const struct i2c_device_id *id)
{
	const struct of_device_id *of_id;
	struct rn5t618 *priv;
	int ret;

	of_id = of_match_device(rn5t618_of_match, &i2c->dev);
	if (!of_id) {
		dev_err(&i2c->dev, "Failed to find matching DT ID\n");
		return -EINVAL;
	}

	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	i2c_set_clientdata(i2c, priv);
	priv->variant = (long)of_id->data;

	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	if (IS_ERR(priv->regmap)) {
		ret = PTR_ERR(priv->regmap);
		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
		return ret;
	}

	ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
				   ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
	if (ret) {
		dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
		return ret;
	}

	rn5t618_pm_power_off = priv;
	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
		if (!pm_power_off)
			pm_power_off = rn5t618_power_off;
		else
			dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
	}

	rn5t618_restart_handler.notifier_call = rn5t618_restart;
	rn5t618_restart_handler.priority = 192;

	ret = register_restart_handler(&rn5t618_restart_handler);
	if (ret) {
		dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
		return ret;
	}

	return 0;
}

static int rn5t618_i2c_remove(struct i2c_client *i2c)
{
	struct rn5t618 *priv = i2c_get_clientdata(i2c);

	if (priv == rn5t618_pm_power_off) {
		rn5t618_pm_power_off = NULL;
		pm_power_off = NULL;
	}

	unregister_restart_handler(&rn5t618_restart_handler);

	return 0;
}

static const struct i2c_device_id rn5t618_i2c_id[] = {
	{ }
};
MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);

static struct i2c_driver rn5t618_i2c_driver = {
	.driver = {
		.name = "rn5t618",
		.of_match_table = of_match_ptr(rn5t618_of_match),
	},
	.probe = rn5t618_i2c_probe,
	.remove = rn5t618_i2c_remove,
	.id_table = rn5t618_i2c_id,
};

module_i2c_driver(rn5t618_i2c_driver);

MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
3c910ecb	1	// SPDX-License-Identifier: GPL-2.0-only
9bb9e29c BG	2	/*
	3	* MFD core driver for Ricoh RN5T618 PMIC
	4	*
	5	* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
a99ab50d	6	* Copyright (C) 2016 Toradex AG
9bb9e29c BG	7	*/
9bb9e29c BG	8
a370f60a	9	#include <linux/delay.h>
9bb9e29c BG	10	#include <linux/i2c.h>
	11	#include <linux/mfd/core.h>
	12	#include <linux/mfd/rn5t618.h>
	13	#include <linux/module.h>
a99ab50d	14	#include <linux/of_device.h>
a370f60a	15	#include <linux/reboot.h>
9bb9e29c BG	16	#include <linux/regmap.h>
	17
	18	static const struct mfd_cell rn5t618_cells[] = {
	19	{ .name = "rn5t618-regulator" },
	20	{ .name = "rn5t618-wdt" },
	21	};
	22
	23	static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
	24	{
	25	switch (reg) {
	26	case RN5T618_WATCHDOGCNT:
	27	case RN5T618_DCIRQ:
	28	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
	29	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	30	case RN5T618_IR_GPR:
	31	case RN5T618_IR_GPF:
	32	case RN5T618_MON_IOIN:
	33	case RN5T618_INTMON:
	34	return true;
	35	default:
	36	return false;
	37	}
	38	}
	39
	40	static const struct regmap_config rn5t618_regmap_config = {
	41	.reg_bits = 8,
	42	.val_bits = 8,
	43	.volatile_reg = rn5t618_volatile_reg,
	44	.max_register = RN5T618_MAX_REG,
	45	.cache_type = REGCACHE_RBTREE,
	46	};
	47
	48	static struct rn5t618 *rn5t618_pm_power_off;
a370f60a	49	static struct notifier_block rn5t618_restart_handler;
9bb9e29c	50
a370f60a	51	static void rn5t618_trigger_poweroff_sequence(bool repower)
9bb9e29c BG	52	{
	53	/* disable automatic repower-on */
	54	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
a370f60a SA	55	RN5T618_REPCNT_REPWRON,
a370f60a SA	56	repower ? RN5T618_REPCNT_REPWRON : 0);
9bb9e29c BG	57	/* start power-off sequence */
	58	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
	59	RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
	60	}
	61
a370f60a SA	62	static void rn5t618_power_off(void)
	63	{
	64	rn5t618_trigger_poweroff_sequence(false);
	65	}
	66
	67	static int rn5t618_restart(struct notifier_block *this,
	68	unsigned long mode, void *cmd)
	69	{
	70	rn5t618_trigger_poweroff_sequence(true);
	71
	72	/*
	73	* Re-power factor detection on PMIC side is not instant. 1ms
	74	* proved to be enough time until reset takes effect.
	75	*/
	76	mdelay(1);
	77
	78	return NOTIFY_DONE;
	79	}
	80
a99ab50d SA	81	static const struct of_device_id rn5t618_of_match[] = {
	82	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
	83	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
c5e589a1	84	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
a99ab50d SA	85	{ }
	86	};
	87	MODULE_DEVICE_TABLE(of, rn5t618_of_match);
	88
9bb9e29c BG	89	static int rn5t618_i2c_probe(struct i2c_client *i2c,
	90	const struct i2c_device_id *id)
	91	{
a99ab50d	92	const struct of_device_id *of_id;
9bb9e29c BG	93	struct rn5t618 *priv;
	94	int ret;
	95
a99ab50d SA	96	of_id = of_match_device(rn5t618_of_match, &i2c->dev);
	97	if (!of_id) {
	98	dev_err(&i2c->dev, "Failed to find matching DT ID\n");
	99	return -EINVAL;
	100	}
	101
9bb9e29c BG	102	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	103	if (!priv)
	104	return -ENOMEM;
	105
	106	i2c_set_clientdata(i2c, priv);
a99ab50d	107	priv->variant = (long)of_id->data;
9bb9e29c BG	108
	109	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	110	if (IS_ERR(priv->regmap)) {
	111	ret = PTR_ERR(priv->regmap);
	112	dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
	113	return ret;
	114	}
	115
f41206c9 LD	116	ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
f41206c9 LD	117	ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
9bb9e29c BG	118	if (ret) {
	119	dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
	120	return ret;
	121	}
	122
a370f60a	123	rn5t618_pm_power_off = priv;
fd65ae4c	124	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
a370f60a	125	if (!pm_power_off)
fd65ae4c	126	pm_power_off = rn5t618_power_off;
a370f60a	127	else
fd65ae4c	128	dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
a370f60a SA	129	}
	130
	131	rn5t618_restart_handler.notifier_call = rn5t618_restart;
	132	rn5t618_restart_handler.priority = 192;
	133
	134	ret = register_restart_handler(&rn5t618_restart_handler);
	135	if (ret) {
	136	dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
	137	return ret;
9bb9e29c BG	138	}
	139
	140	return 0;
	141	}
	142
	143	static int rn5t618_i2c_remove(struct i2c_client *i2c)
	144	{
	145	struct rn5t618 *priv = i2c_get_clientdata(i2c);
	146
	147	if (priv == rn5t618_pm_power_off) {
	148	rn5t618_pm_power_off = NULL;
	149	pm_power_off = NULL;
	150	}
	151
ecca790a SA	152	unregister_restart_handler(&rn5t618_restart_handler);
ecca790a SA	153
9bb9e29c BG	154	return 0;
	155	}
	156
9bb9e29c BG	157	static const struct i2c_device_id rn5t618_i2c_id[] = {
	158	{ }
	159	};
	160	MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
	161
	162	static struct i2c_driver rn5t618_i2c_driver = {
	163	.driver = {
	164	.name = "rn5t618",
	165	.of_match_table = of_match_ptr(rn5t618_of_match),
	166	},
	167	.probe = rn5t618_i2c_probe,
	168	.remove = rn5t618_i2c_remove,
	169	.id_table = rn5t618_i2c_id,
	170	};
	171
	172	module_i2c_driver(rn5t618_i2c_driver);
	173
	174	MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
a99ab50d	175	MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
9bb9e29c	176	MODULE_LICENSE("GPL v2");