[linux-block.git] / drivers / mfd / max77686.c

// SPDX-License-Identifier: GPL-2.0+
//
// max77686.c - mfd core driver for the Maxim 77686/802
//
// Copyright (C) 2012 Samsung Electronics
// Chiwoong Byun <woong.byun@samsung.com>
// Jonghwa Lee <jonghwa3.lee@samsung.com>
//
//This driver is based on max8997.c

#include <linux/export.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max77686.h>
#include <linux/mfd/max77686-private.h>
#include <linux/err.h>
#include <linux/of.h>

static const struct mfd_cell max77686_devs[] = {
	{ .name = "max77686-pmic", },
	{ .name = "max77686-rtc", },
	{ .name = "max77686-clk", },
};

static const struct mfd_cell max77802_devs[] = {
	{ .name = "max77802-pmic", },
	{ .name = "max77802-clk", },
	{ .name = "max77802-rtc", },
};

static bool max77802_pmic_is_accessible_reg(struct device *dev,
					    unsigned int reg)
{
	return reg < MAX77802_REG_PMIC_END;
}

static bool max77802_rtc_is_accessible_reg(struct device *dev,
					   unsigned int reg)
{
	return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END);
}

static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg)
{
	return (max77802_pmic_is_accessible_reg(dev, reg) ||
		max77802_rtc_is_accessible_reg(dev, reg));
}

static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg)
{
	return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 ||
		reg == MAX77802_REG_INT2);
}

static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg)
{
	return (reg == MAX77802_RTC_INT ||
		reg == MAX77802_RTC_UPDATE0 ||
		reg == MAX77802_RTC_UPDATE1);
}

static bool max77802_is_precious_reg(struct device *dev, unsigned int reg)
{
	return (max77802_pmic_is_precious_reg(dev, reg) ||
		max77802_rtc_is_precious_reg(dev, reg));
}

static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg)
{
	return (max77802_is_precious_reg(dev, reg) ||
		reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 ||
		reg == MAX77802_REG_PWRON);
}

static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
{
	return (max77802_rtc_is_precious_reg(dev, reg) ||
		reg == MAX77802_RTC_SEC ||
		reg == MAX77802_RTC_MIN ||
		reg == MAX77802_RTC_HOUR ||
		reg == MAX77802_RTC_WEEKDAY ||
		reg == MAX77802_RTC_MONTH ||
		reg == MAX77802_RTC_YEAR ||
		reg == MAX77802_RTC_MONTHDAY);
}

static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg)
{
	return (max77802_pmic_is_volatile_reg(dev, reg) ||
		max77802_rtc_is_volatile_reg(dev, reg));
}

static const struct regmap_config max77686_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static const struct regmap_config max77802_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.writeable_reg = max77802_is_accessible_reg,
	.readable_reg = max77802_is_accessible_reg,
	.precious_reg = max77802_is_precious_reg,
	.volatile_reg = max77802_is_volatile_reg,
	.name = "max77802-pmic",
	.cache_type = REGCACHE_MAPLE,
};

static const struct regmap_irq max77686_irqs[] = {
	/* INT1 interrupts */
	{ .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, },
	{ .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, },
	{ .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, },
	{ .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, },
	{ .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, },
	{ .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, },
	{ .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, },
	{ .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, },
	/* INT2 interrupts */
	{ .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, },
	{ .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, },
};

static const struct regmap_irq_chip max77686_irq_chip = {
	.name			= "max77686-pmic",
	.status_base		= MAX77686_REG_INT1,
	.mask_base		= MAX77686_REG_INT1MSK,
	.num_regs		= 2,
	.irqs			= max77686_irqs,
	.num_irqs		= ARRAY_SIZE(max77686_irqs),
};

static const struct regmap_irq_chip max77802_irq_chip = {
	.name			= "max77802-pmic",
	.status_base		= MAX77802_REG_INT1,
	.mask_base		= MAX77802_REG_INT1MSK,
	.num_regs		= 2,
	.irqs			= max77686_irqs, /* same masks as 77686 */
	.num_irqs		= ARRAY_SIZE(max77686_irqs),
};

static const struct of_device_id max77686_pmic_dt_match[] = {
	{
		.compatible = "maxim,max77686",
		.data = (void *)TYPE_MAX77686,
	},
	{
		.compatible = "maxim,max77802",
		.data = (void *)TYPE_MAX77802,
	},
	{ },
};
MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match);

static int max77686_i2c_probe(struct i2c_client *i2c)
{
	struct max77686_dev *max77686 = NULL;
	unsigned int data;
	int ret = 0;
	const struct regmap_config *config;
	const struct regmap_irq_chip *irq_chip;
	const struct mfd_cell *cells;
	int n_devs;

	max77686 = devm_kzalloc(&i2c->dev,
				sizeof(struct max77686_dev), GFP_KERNEL);
	if (!max77686)
		return -ENOMEM;

	i2c_set_clientdata(i2c, max77686);
	max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev);
	max77686->dev = &i2c->dev;
	max77686->i2c = i2c;

	max77686->irq = i2c->irq;

	if (max77686->type == TYPE_MAX77686) {
		config = &max77686_regmap_config;
		irq_chip = &max77686_irq_chip;
		cells =  max77686_devs;
		n_devs = ARRAY_SIZE(max77686_devs);
	} else {
		config = &max77802_regmap_config;
		irq_chip = &max77802_irq_chip;
		cells =  max77802_devs;
		n_devs = ARRAY_SIZE(max77802_devs);
	}

	max77686->regmap = devm_regmap_init_i2c(i2c, config);
	if (IS_ERR(max77686->regmap)) {
		ret = PTR_ERR(max77686->regmap);
		dev_err(max77686->dev, "Failed to allocate register map: %d\n",
				ret);
		return ret;
	}

	ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data);
	if (ret < 0) {
		dev_err(max77686->dev,
			"device not found on this channel (this is not an error)\n");
		return -ENODEV;
	}

	ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap,
				       max77686->irq,
				       IRQF_ONESHOT | IRQF_SHARED, 0, irq_chip,
				       &max77686->irq_data);
	if (ret < 0) {
		dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret);
		return ret;
	}

	ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL,
				   0, NULL);
	if (ret < 0) {
		dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
		return ret;
	}

	return 0;
}

static int max77686_suspend(struct device *dev)
{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
		enable_irq_wake(max77686->irq);

	/*
	 * IRQ must be disabled during suspend because if it happens
	 * while suspended it will be handled before resuming I2C.
	 *
	 * When device is woken up from suspend (e.g. by RTC wake alarm),
	 * an interrupt occurs before resuming I2C bus controller.
	 * Interrupt handler tries to read registers but this read
	 * will fail because I2C is still suspended.
	 */
	disable_irq(max77686->irq);

	return 0;
}

static int max77686_resume(struct device *dev)
{
	struct i2c_client *i2c = to_i2c_client(dev);
	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);

	if (device_may_wakeup(dev))
		disable_irq_wake(max77686->irq);

	enable_irq(max77686->irq);

	return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume);

static struct i2c_driver max77686_i2c_driver = {
	.driver = {
		   .name = "max77686",
		   .pm = pm_sleep_ptr(&max77686_pm),
		   .of_match_table = max77686_pmic_dt_match,
	},
	.probe = max77686_i2c_probe,
};

module_i2c_driver(max77686_i2c_driver);

MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver");
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0+
	2	//
	3	// max77686.c - mfd core driver for the Maxim 77686/802
	4	//
	5	// Copyright (C) 2012 Samsung Electronics
	6	// Chiwoong Byun <woong.byun@samsung.com>
	7	// Jonghwa Lee <jonghwa3.lee@samsung.com>
	8	//
	9	//This driver is based on max8997.c
	10
	11	#include <linux/export.h>
	12	#include <linux/slab.h>
	13	#include <linux/i2c.h>
	14	#include <linux/irq.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/pm_runtime.h>
	17	#include <linux/module.h>
	18	#include <linux/mfd/core.h>
	19	#include <linux/mfd/max77686.h>
	20	#include <linux/mfd/max77686-private.h>
	21	#include <linux/err.h>
	22	#include <linux/of.h>
	23
	24	static const struct mfd_cell max77686_devs[] = {
	25	{ .name = "max77686-pmic", },
	26	{ .name = "max77686-rtc", },
	27	{ .name = "max77686-clk", },
	28	};
	29
	30	static const struct mfd_cell max77802_devs[] = {
	31	{ .name = "max77802-pmic", },
	32	{ .name = "max77802-clk", },
	33	{ .name = "max77802-rtc", },
	34	};
	35
	36	static bool max77802_pmic_is_accessible_reg(struct device *dev,
	37	unsigned int reg)
	38	{
	39	return reg < MAX77802_REG_PMIC_END;
	40	}
	41
	42	static bool max77802_rtc_is_accessible_reg(struct device *dev,
	43	unsigned int reg)
	44	{
	45	return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END);
	46	}
	47
	48	static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg)
	49	{
	50	return (max77802_pmic_is_accessible_reg(dev, reg) \|\|
	51	max77802_rtc_is_accessible_reg(dev, reg));
	52	}
	53
	54	static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg)
	55	{
	56	return (reg == MAX77802_REG_INTSRC \|\| reg == MAX77802_REG_INT1 \|\|
	57	reg == MAX77802_REG_INT2);
	58	}
	59
	60	static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg)
	61	{
	62	return (reg == MAX77802_RTC_INT \|\|
	63	reg == MAX77802_RTC_UPDATE0 \|\|
	64	reg == MAX77802_RTC_UPDATE1);
	65	}
	66
	67	static bool max77802_is_precious_reg(struct device *dev, unsigned int reg)
	68	{
	69	return (max77802_pmic_is_precious_reg(dev, reg) \|\|
	70	max77802_rtc_is_precious_reg(dev, reg));
	71	}
	72
	73	static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg)
	74	{
	75	return (max77802_is_precious_reg(dev, reg) \|\|
	76	reg == MAX77802_REG_STATUS1 \|\| reg == MAX77802_REG_STATUS2 \|\|
	77	reg == MAX77802_REG_PWRON);
	78	}
	79
	80	static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
	81	{
	82	return (max77802_rtc_is_precious_reg(dev, reg) \|\|
	83	reg == MAX77802_RTC_SEC \|\|
	84	reg == MAX77802_RTC_MIN \|\|
	85	reg == MAX77802_RTC_HOUR \|\|
	86	reg == MAX77802_RTC_WEEKDAY \|\|
	87	reg == MAX77802_RTC_MONTH \|\|
	88	reg == MAX77802_RTC_YEAR \|\|
	89	reg == MAX77802_RTC_MONTHDAY);
	90	}
	91
	92	static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg)
	93	{
	94	return (max77802_pmic_is_volatile_reg(dev, reg) \|\|
	95	max77802_rtc_is_volatile_reg(dev, reg));
	96	}
	97
	98	static const struct regmap_config max77686_regmap_config = {
	99	.reg_bits = 8,
	100	.val_bits = 8,
	101	};
	102
	103	static const struct regmap_config max77802_regmap_config = {
	104	.reg_bits = 8,
	105	.val_bits = 8,
	106	.writeable_reg = max77802_is_accessible_reg,
	107	.readable_reg = max77802_is_accessible_reg,
	108	.precious_reg = max77802_is_precious_reg,
	109	.volatile_reg = max77802_is_volatile_reg,
	110	.name = "max77802-pmic",
	111	.cache_type = REGCACHE_MAPLE,
	112	};
	113
	114	static const struct regmap_irq max77686_irqs[] = {
	115	/* INT1 interrupts */
	116	{ .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, },
	117	{ .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, },
	118	{ .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, },
	119	{ .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, },
	120	{ .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, },
	121	{ .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, },
	122	{ .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, },
	123	{ .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, },
	124	/* INT2 interrupts */
	125	{ .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, },
	126	{ .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, },
	127	};
	128
	129	static const struct regmap_irq_chip max77686_irq_chip = {
	130	.name = "max77686-pmic",
	131	.status_base = MAX77686_REG_INT1,
	132	.mask_base = MAX77686_REG_INT1MSK,
	133	.num_regs = 2,
	134	.irqs = max77686_irqs,
	135	.num_irqs = ARRAY_SIZE(max77686_irqs),
	136	};
	137
	138	static const struct regmap_irq_chip max77802_irq_chip = {
	139	.name = "max77802-pmic",
	140	.status_base = MAX77802_REG_INT1,
	141	.mask_base = MAX77802_REG_INT1MSK,
	142	.num_regs = 2,
	143	.irqs = max77686_irqs, /* same masks as 77686 */
	144	.num_irqs = ARRAY_SIZE(max77686_irqs),
	145	};
	146
	147	static const struct of_device_id max77686_pmic_dt_match[] = {
	148	{
	149	.compatible = "maxim,max77686",
	150	.data = (void *)TYPE_MAX77686,
	151	},
	152	{
	153	.compatible = "maxim,max77802",
	154	.data = (void *)TYPE_MAX77802,
	155	},
	156	{ },
	157	};
	158	MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match);
	159
	160	static int max77686_i2c_probe(struct i2c_client *i2c)
	161	{
	162	struct max77686_dev *max77686 = NULL;
	163	unsigned int data;
	164	int ret = 0;
	165	const struct regmap_config *config;
	166	const struct regmap_irq_chip *irq_chip;
	167	const struct mfd_cell *cells;
	168	int n_devs;
	169
	170	max77686 = devm_kzalloc(&i2c->dev,
	171	sizeof(struct max77686_dev), GFP_KERNEL);
	172	if (!max77686)
	173	return -ENOMEM;
	174
	175	i2c_set_clientdata(i2c, max77686);
	176	max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev);
	177	max77686->dev = &i2c->dev;
	178	max77686->i2c = i2c;
	179
	180	max77686->irq = i2c->irq;
	181
	182	if (max77686->type == TYPE_MAX77686) {
	183	config = &max77686_regmap_config;
	184	irq_chip = &max77686_irq_chip;
	185	cells = max77686_devs;
	186	n_devs = ARRAY_SIZE(max77686_devs);
	187	} else {
	188	config = &max77802_regmap_config;
	189	irq_chip = &max77802_irq_chip;
	190	cells = max77802_devs;
	191	n_devs = ARRAY_SIZE(max77802_devs);
	192	}
	193
	194	max77686->regmap = devm_regmap_init_i2c(i2c, config);
	195	if (IS_ERR(max77686->regmap)) {
	196	ret = PTR_ERR(max77686->regmap);
	197	dev_err(max77686->dev, "Failed to allocate register map: %d\n",
	198	ret);
	199	return ret;
	200	}
	201
	202	ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data);
	203	if (ret < 0) {
	204	dev_err(max77686->dev,
	205	"device not found on this channel (this is not an error)\n");
	206	return -ENODEV;
	207	}
	208
	209	ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap,
	210	max77686->irq,
	211	IRQF_ONESHOT \| IRQF_SHARED, 0, irq_chip,
	212	&max77686->irq_data);
	213	if (ret < 0) {
	214	dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret);
	215	return ret;
	216	}
	217
	218	ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL,
	219	0, NULL);
	220	if (ret < 0) {
	221	dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
	222	return ret;
	223	}
	224
	225	return 0;
	226	}
	227
	228	static int max77686_suspend(struct device *dev)
	229	{
	230	struct i2c_client *i2c = to_i2c_client(dev);
	231	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
	232
	233	if (device_may_wakeup(dev))
	234	enable_irq_wake(max77686->irq);
	235
	236	/*
	237	* IRQ must be disabled during suspend because if it happens
	238	* while suspended it will be handled before resuming I2C.
	239	*
	240	* When device is woken up from suspend (e.g. by RTC wake alarm),
	241	* an interrupt occurs before resuming I2C bus controller.
	242	* Interrupt handler tries to read registers but this read
	243	* will fail because I2C is still suspended.
	244	*/
	245	disable_irq(max77686->irq);
	246
	247	return 0;
	248	}
	249
	250	static int max77686_resume(struct device *dev)
	251	{
	252	struct i2c_client *i2c = to_i2c_client(dev);
	253	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
	254
	255	if (device_may_wakeup(dev))
	256	disable_irq_wake(max77686->irq);
	257
	258	enable_irq(max77686->irq);
	259
	260	return 0;
	261	}
	262
	263	static DEFINE_SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume);
	264
	265	static struct i2c_driver max77686_i2c_driver = {
	266	.driver = {
	267	.name = "max77686",
	268	.pm = pm_sleep_ptr(&max77686_pm),
	269	.of_match_table = max77686_pmic_dt_match,
	270	},
	271	.probe = max77686_i2c_probe,
	272	};
	273
	274	module_i2c_driver(max77686_i2c_driver);
	275
	276	MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver");
	277	MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
	278	MODULE_LICENSE("GPL");