[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/interrupt.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>

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

static const struct mfd_cell rc5t619_cells[] = {
	{ .name = "rn5t618-adc" },
	{ .name = "rn5t618-regulator" },
	{ .name = "rc5t619-rtc" },
	{ .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_ADCCNT3:
	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	case RN5T618_IR_GPR:
	case RN5T618_IR_GPF:
	case RN5T618_MON_IOIN:
	case RN5T618_INTMON:
	case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
	case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
	case RN5T618_CHGSTATE:
	case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
	case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
		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 const struct regmap_irq rc5t619_irqs[] = {
	REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
	REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
	REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
	REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
	REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
	REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
};

static const struct regmap_irq_chip rc5t619_irq_chip = {
	.name = "rc5t619",
	.irqs = rc5t619_irqs,
	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
	.num_regs = 1,
	.status_base = RN5T618_INTMON,
	.mask_base = RN5T618_INTEN,
	.mask_invert = true,
};

static struct i2c_client *rn5t618_pm_power_off;
static struct notifier_block rn5t618_restart_handler;

static int rn5t618_irq_init(struct rn5t618 *rn5t618)
{
	const struct regmap_irq_chip *irq_chip = NULL;
	int ret;

	if (!rn5t618->irq)
		return 0;

	switch (rn5t618->variant) {
	case RC5T619:
		irq_chip = &rc5t619_irq_chip;
		break;
	default:
		dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
			(int)rn5t618->variant);
		return -ENOENT;
	}

	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
				       rn5t618->irq,
				       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				       0, irq_chip, &rn5t618->irq_data);
	if (ret)
		dev_err(rn5t618->dev, "Failed to register IRQ chip\n");

	return ret;
}

static void rn5t618_trigger_poweroff_sequence(bool repower)
{
	int ret;

	/* disable automatic repower-on */
	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
	if (ret < 0)
		goto err;

	ret &= ~RN5T618_REPCNT_REPWRON;
	if (repower)
		ret |= RN5T618_REPCNT_REPWRON;

	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
					RN5T618_REPCNT, (u8)ret);
	if (ret < 0)
		goto err;

	/* start power-off sequence */
	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
	if (ret < 0)
		goto err;

	ret |= RN5T618_SLPCNT_SWPWROFF;

	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
					RN5T618_SLPCNT, (u8)ret);
	if (ret < 0)
		goto err;

	return;

err:
	dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
}

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 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->irq = i2c->irq;
	priv->dev = &i2c->dev;

	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;
	}

	if (priv->variant == RC5T619)
		ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
					   rc5t619_cells,
					   ARRAY_SIZE(rc5t619_cells),
					   NULL, 0, NULL);
	else
		ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
					   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 = i2c;
	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 rn5t618_irq_init(priv);
}

static int rn5t618_i2c_remove(struct i2c_client *i2c)
{
	if (i2c == rn5t618_pm_power_off) {
		rn5t618_pm_power_off = NULL;
		pm_power_off = NULL;
	}

	unregister_restart_handler(&rn5t618_restart_handler);

	return 0;
}

static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
{
	struct rn5t618 *priv = dev_get_drvdata(dev);

	if (priv->irq)
		disable_irq(priv->irq);

	return 0;
}

static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
{
	struct rn5t618 *priv = dev_get_drvdata(dev);

	if (priv->irq)
		enable_irq(priv->irq);

	return 0;
}

static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
			rn5t618_i2c_suspend,
			rn5t618_i2c_resume);

static struct i2c_driver rn5t618_i2c_driver = {
	.driver = {
		.name = "rn5t618",
		.of_match_table = of_match_ptr(rn5t618_of_match),
		.pm = &rn5t618_i2c_dev_pm_ops,
	},
	.probe_new = rn5t618_i2c_probe,
	.remove = rn5t618_i2c_remove,
};

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	10	#include <linux/i2c.h>
0c816045 AK	11	#include <linux/interrupt.h>
0c816045 AK	12	#include <linux/irq.h>
9bb9e29c BG	13	#include <linux/mfd/core.h>
	14	#include <linux/mfd/rn5t618.h>
	15	#include <linux/module.h>
a99ab50d	16	#include <linux/of_device.h>
bc616766	17	#include <linux/platform_device.h>
a370f60a	18	#include <linux/reboot.h>
9bb9e29c BG	19	#include <linux/regmap.h>
	20
	21	static const struct mfd_cell rn5t618_cells[] = {
	22	{ .name = "rn5t618-regulator" },
	23	{ .name = "rn5t618-wdt" },
	24	};
	25
bc616766 AK	26	static const struct mfd_cell rc5t619_cells[] = {
	27	{ .name = "rn5t618-adc" },
	28	{ .name = "rn5t618-regulator" },
	29	{ .name = "rc5t619-rtc" },
	30	{ .name = "rn5t618-wdt" },
	31	};
	32
9bb9e29c BG	33	static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
	34	{
	35	switch (reg) {
	36	case RN5T618_WATCHDOGCNT:
	37	case RN5T618_DCIRQ:
	38	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
2f3dc25c	39	case RN5T618_ADCCNT3:
9bb9e29c BG	40	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	41	case RN5T618_IR_GPR:
	42	case RN5T618_IR_GPF:
	43	case RN5T618_MON_IOIN:
	44	case RN5T618_INTMON:
11027ce6 AK	45	case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
11027ce6 AK	46	case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
594f1935 AK	47	case RN5T618_CHGSTATE:
	48	case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
	49	case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
9bb9e29c BG	50	return true;
	51	default:
	52	return false;
	53	}
	54	}
	55
	56	static const struct regmap_config rn5t618_regmap_config = {
	57	.reg_bits = 8,
	58	.val_bits = 8,
	59	.volatile_reg = rn5t618_volatile_reg,
	60	.max_register = RN5T618_MAX_REG,
	61	.cache_type = REGCACHE_RBTREE,
	62	};
	63
0c816045 AK	64	static const struct regmap_irq rc5t619_irqs[] = {
	65	REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
	66	REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
	67	REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
	68	REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
	69	REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
	70	REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
	71	};
	72
	73	static const struct regmap_irq_chip rc5t619_irq_chip = {
	74	.name = "rc5t619",
	75	.irqs = rc5t619_irqs,
	76	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
	77	.num_regs = 1,
	78	.status_base = RN5T618_INTMON,
	79	.mask_base = RN5T618_INTEN,
	80	.mask_invert = true,
	81	};
	82
cf84dc0b	83	static struct i2c_client *rn5t618_pm_power_off;
a370f60a	84	static struct notifier_block rn5t618_restart_handler;
9bb9e29c	85
0c816045 AK	86	static int rn5t618_irq_init(struct rn5t618 *rn5t618)
	87	{
	88	const struct regmap_irq_chip *irq_chip = NULL;
	89	int ret;
	90
	91	if (!rn5t618->irq)
	92	return 0;
	93
	94	switch (rn5t618->variant) {
	95	case RC5T619:
	96	irq_chip = &rc5t619_irq_chip;
	97	break;
	98	default:
	99	dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
	100	(int)rn5t618->variant);
	101	return -ENOENT;
	102	}
	103
	104	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
	105	rn5t618->irq,
	106	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	107	0, irq_chip, &rn5t618->irq_data);
	108	if (ret)
	109	dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
	110
	111	return ret;
	112	}
	113
a370f60a	114	static void rn5t618_trigger_poweroff_sequence(bool repower)
9bb9e29c	115	{
cf84dc0b AK	116	int ret;
cf84dc0b AK	117
9bb9e29c	118	/* disable automatic repower-on */
cf84dc0b AK	119	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
	120	if (ret < 0)
	121	goto err;
	122
	123	ret &= ~RN5T618_REPCNT_REPWRON;
	124	if (repower)
	125	ret \|= RN5T618_REPCNT_REPWRON;
	126
	127	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
	128	RN5T618_REPCNT, (u8)ret);
	129	if (ret < 0)
	130	goto err;
	131
9bb9e29c	132	/* start power-off sequence */
cf84dc0b AK	133	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
	134	if (ret < 0)
	135	goto err;
	136
	137	ret \|= RN5T618_SLPCNT_SWPWROFF;
	138
	139	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
	140	RN5T618_SLPCNT, (u8)ret);
	141	if (ret < 0)
	142	goto err;
	143
	144	return;
	145
	146	err:
	147	dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
9bb9e29c BG	148	}
9bb9e29c BG	149
a370f60a SA	150	static void rn5t618_power_off(void)
	151	{
	152	rn5t618_trigger_poweroff_sequence(false);
	153	}
	154
	155	static int rn5t618_restart(struct notifier_block *this,
	156	unsigned long mode, void *cmd)
	157	{
	158	rn5t618_trigger_poweroff_sequence(true);
	159
	160	/*
	161	* Re-power factor detection on PMIC side is not instant. 1ms
	162	* proved to be enough time until reset takes effect.
	163	*/
	164	mdelay(1);
	165
	166	return NOTIFY_DONE;
	167	}
	168
a99ab50d SA	169	static const struct of_device_id rn5t618_of_match[] = {
	170	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
	171	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
c5e589a1	172	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
a99ab50d SA	173	{ }
	174	};
	175	MODULE_DEVICE_TABLE(of, rn5t618_of_match);
	176
7858658c	177	static int rn5t618_i2c_probe(struct i2c_client *i2c)
9bb9e29c	178	{
a99ab50d	179	const struct of_device_id *of_id;
9bb9e29c BG	180	struct rn5t618 *priv;
	181	int ret;
	182
a99ab50d SA	183	of_id = of_match_device(rn5t618_of_match, &i2c->dev);
	184	if (!of_id) {
	185	dev_err(&i2c->dev, "Failed to find matching DT ID\n");
	186	return -EINVAL;
	187	}
	188
9bb9e29c BG	189	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	190	if (!priv)
	191	return -ENOMEM;
	192
	193	i2c_set_clientdata(i2c, priv);
a99ab50d	194	priv->variant = (long)of_id->data;
0c816045 AK	195	priv->irq = i2c->irq;
0c816045 AK	196	priv->dev = &i2c->dev;
9bb9e29c BG	197
	198	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	199	if (IS_ERR(priv->regmap)) {
	200	ret = PTR_ERR(priv->regmap);
	201	dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
	202	return ret;
	203	}
	204
bc616766 AK	205	if (priv->variant == RC5T619)
	206	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
	207	rc5t619_cells,
	208	ARRAY_SIZE(rc5t619_cells),
	209	NULL, 0, NULL);
	210	else
	211	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
	212	rn5t618_cells,
	213	ARRAY_SIZE(rn5t618_cells),
	214	NULL, 0, NULL);
9bb9e29c BG	215	if (ret) {
	216	dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
	217	return ret;
	218	}
	219
cf84dc0b	220	rn5t618_pm_power_off = i2c;
fd65ae4c	221	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
a370f60a	222	if (!pm_power_off)
fd65ae4c	223	pm_power_off = rn5t618_power_off;
a370f60a	224	else
fd65ae4c	225	dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
a370f60a SA	226	}
	227
	228	rn5t618_restart_handler.notifier_call = rn5t618_restart;
	229	rn5t618_restart_handler.priority = 192;
	230
	231	ret = register_restart_handler(&rn5t618_restart_handler);
	232	if (ret) {
	233	dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
	234	return ret;
9bb9e29c BG	235	}
9bb9e29c BG	236
0c816045	237	return rn5t618_irq_init(priv);
9bb9e29c BG	238	}
	239
	240	static int rn5t618_i2c_remove(struct i2c_client *i2c)
	241	{
cf84dc0b	242	if (i2c == rn5t618_pm_power_off) {
9bb9e29c BG	243	rn5t618_pm_power_off = NULL;
	244	pm_power_off = NULL;
	245	}
	246
ecca790a SA	247	unregister_restart_handler(&rn5t618_restart_handler);
ecca790a SA	248
9bb9e29c BG	249	return 0;
	250	}
	251
0c816045 AK	252	static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
	253	{
	254	struct rn5t618 *priv = dev_get_drvdata(dev);
	255
	256	if (priv->irq)
	257	disable_irq(priv->irq);
	258
	259	return 0;
	260	}
	261
	262	static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
	263	{
	264	struct rn5t618 *priv = dev_get_drvdata(dev);
	265
	266	if (priv->irq)
	267	enable_irq(priv->irq);
	268
	269	return 0;
	270	}
	271
0c816045 AK	272	static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
	273	rn5t618_i2c_suspend,
	274	rn5t618_i2c_resume);
	275
9bb9e29c BG	276	static struct i2c_driver rn5t618_i2c_driver = {
	277	.driver = {
	278	.name = "rn5t618",
	279	.of_match_table = of_match_ptr(rn5t618_of_match),
0c816045	280	.pm = &rn5t618_i2c_dev_pm_ops,
9bb9e29c	281	},
7858658c	282	.probe_new = rn5t618_i2c_probe,
9bb9e29c	283	.remove = rn5t618_i2c_remove,
9bb9e29c BG	284	};
	285
	286	module_i2c_driver(rn5t618_i2c_driver);
	287
	288	MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
a99ab50d	289	MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
9bb9e29c	290	MODULE_LICENSE("GPL v2");