[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.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-power" },
	{ .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_CHGCTL1:
	case RN5T618_REGISET1 ... RN5T618_REGISET2:
	case RN5T618_CHGSTATE:
	case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
	case RN5T618_GCHGDET:
	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_MAPLE,
};

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,
	.unmask_base = RN5T618_INTEN,
};

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_LOW | 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)
{
	struct rn5t618 *priv;
	int ret;

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

	i2c_set_clientdata(i2c, priv);
	priv->variant = (long)i2c_get_match_data(i2c);
	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 void 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);
}

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 = rn5t618_of_match,
		.pm = &rn5t618_i2c_dev_pm_ops,
	},
	.probe = 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>
0db434f5	16	#include <linux/of.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[] = {
bc616766 AK	27	{ .name = "rn5t618-adc" },
d1264a07	28	{ .name = "rn5t618-power" },
bc616766 AK	29	{ .name = "rn5t618-regulator" },
	30	{ .name = "rc5t619-rtc" },
	31	{ .name = "rn5t618-wdt" },
	32	};
	33
9bb9e29c BG	34	static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
	35	{
	36	switch (reg) {
	37	case RN5T618_WATCHDOGCNT:
	38	case RN5T618_DCIRQ:
	39	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
2f3dc25c	40	case RN5T618_ADCCNT3:
9bb9e29c BG	41	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	42	case RN5T618_IR_GPR:
	43	case RN5T618_IR_GPF:
	44	case RN5T618_MON_IOIN:
	45	case RN5T618_INTMON:
11027ce6 AK	46	case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
11027ce6 AK	47	case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
4502647e AK	48	case RN5T618_CHGCTL1:
4502647e AK	49	case RN5T618_REGISET1 ... RN5T618_REGISET2:
594f1935 AK	50	case RN5T618_CHGSTATE:
594f1935 AK	51	case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
4502647e	52	case RN5T618_GCHGDET:
594f1935	53	case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
9bb9e29c BG	54	return true;
	55	default:
	56	return false;
	57	}
	58	}
	59
	60	static const struct regmap_config rn5t618_regmap_config = {
	61	.reg_bits = 8,
	62	.val_bits = 8,
	63	.volatile_reg = rn5t618_volatile_reg,
	64	.max_register = RN5T618_MAX_REG,
462d188a	65	.cache_type = REGCACHE_MAPLE,
9bb9e29c BG	66	};
9bb9e29c BG	67
0c816045 AK	68	static const struct regmap_irq rc5t619_irqs[] = {
	69	REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
	70	REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
	71	REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
	72	REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
	73	REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
	74	REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
	75	};
	76
	77	static const struct regmap_irq_chip rc5t619_irq_chip = {
	78	.name = "rc5t619",
	79	.irqs = rc5t619_irqs,
	80	.num_irqs = ARRAY_SIZE(rc5t619_irqs),
	81	.num_regs = 1,
	82	.status_base = RN5T618_INTMON,
80ff2d30	83	.unmask_base = RN5T618_INTEN,
0c816045 AK	84	};
0c816045 AK	85
cf84dc0b	86	static struct i2c_client *rn5t618_pm_power_off;
a370f60a	87	static struct notifier_block rn5t618_restart_handler;
9bb9e29c	88
0c816045 AK	89	static int rn5t618_irq_init(struct rn5t618 *rn5t618)
	90	{
	91	const struct regmap_irq_chip *irq_chip = NULL;
	92	int ret;
	93
	94	if (!rn5t618->irq)
	95	return 0;
	96
	97	switch (rn5t618->variant) {
	98	case RC5T619:
	99	irq_chip = &rc5t619_irq_chip;
	100	break;
	101	default:
	102	dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
	103	(int)rn5t618->variant);
	104	return -ENOENT;
	105	}
	106
	107	ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
	108	rn5t618->irq,
a1649a52	109	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
0c816045 AK	110	0, irq_chip, &rn5t618->irq_data);
	111	if (ret)
	112	dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
	113
	114	return ret;
	115	}
	116
a370f60a	117	static void rn5t618_trigger_poweroff_sequence(bool repower)
9bb9e29c	118	{
cf84dc0b AK	119	int ret;
cf84dc0b AK	120
9bb9e29c	121	/* disable automatic repower-on */
cf84dc0b AK	122	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
	123	if (ret < 0)
	124	goto err;
	125
	126	ret &= ~RN5T618_REPCNT_REPWRON;
	127	if (repower)
	128	ret \|= RN5T618_REPCNT_REPWRON;
	129
	130	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
	131	RN5T618_REPCNT, (u8)ret);
	132	if (ret < 0)
	133	goto err;
	134
9bb9e29c	135	/* start power-off sequence */
cf84dc0b AK	136	ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
	137	if (ret < 0)
	138	goto err;
	139
	140	ret \|= RN5T618_SLPCNT_SWPWROFF;
	141
	142	ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
	143	RN5T618_SLPCNT, (u8)ret);
	144	if (ret < 0)
	145	goto err;
	146
	147	return;
	148
	149	err:
	150	dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
9bb9e29c BG	151	}
9bb9e29c BG	152
a370f60a SA	153	static void rn5t618_power_off(void)
	154	{
	155	rn5t618_trigger_poweroff_sequence(false);
	156	}
	157
	158	static int rn5t618_restart(struct notifier_block *this,
	159	unsigned long mode, void *cmd)
	160	{
	161	rn5t618_trigger_poweroff_sequence(true);
	162
	163	/*
	164	* Re-power factor detection on PMIC side is not instant. 1ms
	165	* proved to be enough time until reset takes effect.
	166	*/
	167	mdelay(1);
	168
	169	return NOTIFY_DONE;
	170	}
	171
a99ab50d SA	172	static const struct of_device_id rn5t618_of_match[] = {
	173	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
	174	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
c5e589a1	175	{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
a99ab50d SA	176	{ }
	177	};
	178	MODULE_DEVICE_TABLE(of, rn5t618_of_match);
	179
7858658c	180	static int rn5t618_i2c_probe(struct i2c_client *i2c)
9bb9e29c BG	181	{
	182	struct rn5t618 *priv;
	183	int ret;
	184
	185	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	186	if (!priv)
	187	return -ENOMEM;
	188
	189	i2c_set_clientdata(i2c, priv);
0db434f5	190	priv->variant = (long)i2c_get_match_data(i2c);
0c816045 AK	191	priv->irq = i2c->irq;
0c816045 AK	192	priv->dev = &i2c->dev;
9bb9e29c BG	193
	194	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	195	if (IS_ERR(priv->regmap)) {
	196	ret = PTR_ERR(priv->regmap);
	197	dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
	198	return ret;
	199	}
	200
bc616766 AK	201	if (priv->variant == RC5T619)
	202	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
	203	rc5t619_cells,
	204	ARRAY_SIZE(rc5t619_cells),
	205	NULL, 0, NULL);
	206	else
	207	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
	208	rn5t618_cells,
	209	ARRAY_SIZE(rn5t618_cells),
	210	NULL, 0, NULL);
9bb9e29c BG	211	if (ret) {
	212	dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
	213	return ret;
	214	}
	215
cf84dc0b	216	rn5t618_pm_power_off = i2c;
fd65ae4c	217	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
a370f60a	218	if (!pm_power_off)
fd65ae4c	219	pm_power_off = rn5t618_power_off;
a370f60a	220	else
fd65ae4c	221	dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
a370f60a SA	222	}
	223
	224	rn5t618_restart_handler.notifier_call = rn5t618_restart;
	225	rn5t618_restart_handler.priority = 192;
	226
	227	ret = register_restart_handler(&rn5t618_restart_handler);
	228	if (ret) {
	229	dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
	230	return ret;
9bb9e29c BG	231	}
9bb9e29c BG	232
0c816045	233	return rn5t618_irq_init(priv);
9bb9e29c BG	234	}
9bb9e29c BG	235
ed5c2f5f	236	static void rn5t618_i2c_remove(struct i2c_client *i2c)
9bb9e29c	237	{
cf84dc0b	238	if (i2c == rn5t618_pm_power_off) {
9bb9e29c BG	239	rn5t618_pm_power_off = NULL;
	240	pm_power_off = NULL;
	241	}
	242
ecca790a	243	unregister_restart_handler(&rn5t618_restart_handler);
9bb9e29c BG	244	}
9bb9e29c BG	245
0c816045 AK	246	static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
	247	{
	248	struct rn5t618 *priv = dev_get_drvdata(dev);
	249
	250	if (priv->irq)
	251	disable_irq(priv->irq);
	252
	253	return 0;
	254	}
	255
	256	static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
	257	{
	258	struct rn5t618 *priv = dev_get_drvdata(dev);
	259
	260	if (priv->irq)
	261	enable_irq(priv->irq);
	262
	263	return 0;
	264	}
	265
0c816045 AK	266	static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
	267	rn5t618_i2c_suspend,
	268	rn5t618_i2c_resume);
	269
9bb9e29c BG	270	static struct i2c_driver rn5t618_i2c_driver = {
	271	.driver = {
	272	.name = "rn5t618",
59cf381f	273	.of_match_table = rn5t618_of_match,
0c816045	274	.pm = &rn5t618_i2c_dev_pm_ops,
9bb9e29c	275	},
9816d859	276	.probe = rn5t618_i2c_probe,
9bb9e29c	277	.remove = rn5t618_i2c_remove,
9bb9e29c BG	278	};
	279
	280	module_i2c_driver(rn5t618_i2c_driver);
	281
	282	MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
a99ab50d	283	MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
9bb9e29c	284	MODULE_LICENSE("GPL v2");