[mirror_ubuntu-jammy-kernel.git] / drivers / regulator / ltc3676.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2016 Gateworks Corporation, Inc. All Rights Reserved.
 */
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>

#define DRIVER_NAME		"ltc3676"

/* LTC3676 Registers */
#define LTC3676_BUCK1     0x01
#define LTC3676_BUCK2     0x02
#define LTC3676_BUCK3     0x03
#define LTC3676_BUCK4     0x04
#define LTC3676_LDOA      0x05
#define LTC3676_LDOB      0x06
#define LTC3676_SQD1      0x07
#define LTC3676_SQD2      0x08
#define LTC3676_CNTRL     0x09
#define LTC3676_DVB1A     0x0A
#define LTC3676_DVB1B     0x0B
#define LTC3676_DVB2A     0x0C
#define LTC3676_DVB2B     0x0D
#define LTC3676_DVB3A     0x0E
#define LTC3676_DVB3B     0x0F
#define LTC3676_DVB4A     0x10
#define LTC3676_DVB4B     0x11
#define LTC3676_MSKIRQ    0x12
#define LTC3676_MSKPG     0x13
#define LTC3676_USER      0x14
#define LTC3676_IRQSTAT   0x15
#define LTC3676_PGSTATL   0x16
#define LTC3676_PGSTATRT  0x17
#define LTC3676_HRST      0x1E
#define LTC3676_CLIRQ     0x1F

#define LTC3676_DVBxA_REF_SELECT	BIT(5)
#define LTC3676_DVBxB_PGOOD_MASK	BIT(5)

#define LTC3676_IRQSTAT_PGOOD_TIMEOUT	BIT(3)
#define LTC3676_IRQSTAT_UNDERVOLT_WARN	BIT(4)
#define LTC3676_IRQSTAT_UNDERVOLT_FAULT	BIT(5)
#define LTC3676_IRQSTAT_THERMAL_WARN	BIT(6)
#define LTC3676_IRQSTAT_THERMAL_FAULT	BIT(7)

enum ltc3676_reg {
	LTC3676_SW1,
	LTC3676_SW2,
	LTC3676_SW3,
	LTC3676_SW4,
	LTC3676_LDO1,
	LTC3676_LDO2,
	LTC3676_LDO3,
	LTC3676_LDO4,
	LTC3676_NUM_REGULATORS,
};

struct ltc3676 {
	struct regmap *regmap;
	struct device *dev;
	struct regulator_desc regulator_descs[LTC3676_NUM_REGULATORS];
	struct regulator_dev *regulators[LTC3676_NUM_REGULATORS];
};

static int ltc3676_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
	struct device *dev = ltc3676->dev;
	int dcdc = rdev_get_id(rdev);
	int sel;

	dev_dbg(dev, "%s id=%d uV=%d\n", __func__, dcdc, uV);
	sel = regulator_map_voltage_linear(rdev, uV, uV);
	if (sel < 0)
		return sel;

	/* DVBB register follows right after the corresponding DVBA register */
	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
				  rdev->desc->vsel_mask, sel);
}

static int ltc3676_set_suspend_mode(struct regulator_dev *rdev,
				    unsigned int mode)
{
	struct ltc3676 *ltc3676= rdev_get_drvdata(rdev);
	struct device *dev = ltc3676->dev;
	int mask, val;
	int dcdc = rdev_get_id(rdev);

	dev_dbg(dev, "%s id=%d mode=%d\n", __func__, dcdc, mode);

	mask = LTC3676_DVBxA_REF_SELECT;
	switch (mode) {
	case REGULATOR_MODE_STANDBY:
		val = 0; /* select DVBxA */
		break;
	case REGULATOR_MODE_NORMAL:
		val = LTC3676_DVBxA_REF_SELECT; /* select DVBxB */
		break;
	default:
		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
			 rdev->desc->name, mode);
		return -EINVAL;
	}

	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg,
				  mask, val);
}

static int ltc3676_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
{
	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
	struct device *dev = ltc3676->dev;
	int ret, dcdc = rdev_get_id(rdev);

	dev_dbg(dev, "%s id=%d selector=%d\n", __func__, dcdc, selector);

	ret = regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
				 LTC3676_DVBxB_PGOOD_MASK,
				 LTC3676_DVBxB_PGOOD_MASK);
	if (ret)
		return ret;

	return regulator_set_voltage_sel_regmap(rdev, selector);
}

static inline unsigned int ltc3676_scale(unsigned int uV, u32 r1, u32 r2)
{
	uint64_t tmp;
	if (uV == 0)
		return 0;
	tmp = (uint64_t)uV * r1;
	do_div(tmp, r2);
	return uV + (unsigned int)tmp;
}

static int ltc3676_of_parse_cb(struct device_node *np,
			       const struct regulator_desc *desc,
			       struct regulator_config *config)
{
	struct ltc3676 *ltc3676 = config->driver_data;
	struct regulator_desc *rdesc = &ltc3676->regulator_descs[desc->id];
	u32 r[2];
	int ret;

	/* LDO3 has a fixed output */
	if (desc->id == LTC3676_LDO3)
		return 0;

	ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
	if (ret) {
		dev_err(ltc3676->dev, "Failed to parse voltage divider: %d\n",
			ret);
		return ret;
	}

	rdesc->min_uV = ltc3676_scale(desc->min_uV, r[0], r[1]);
	rdesc->uV_step = ltc3676_scale(desc->uV_step, r[0], r[1]);
	rdesc->fixed_uV = ltc3676_scale(desc->fixed_uV, r[0], r[1]);

	return 0;
}

/* SW1, SW2, SW3, SW4 linear 0.8V-3.3V with scalar via R1/R2 feeback res */
static const struct regulator_ops ltc3676_linear_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = ltc3676_set_voltage_sel,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_suspend_voltage = ltc3676_set_suspend_voltage,
	.set_suspend_mode = ltc3676_set_suspend_mode,
};

/* LDO1 always on fixed 0.8V-3.3V via scalar via R1/R2 feeback res */
static const struct regulator_ops ltc3676_fixed_standby_regulator_ops = {
};

/* LDO2, LDO3 fixed (LDO2 has external scalar via R1/R2 feedback res) */
static const struct regulator_ops ltc3676_fixed_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
};

#define LTC3676_REG(_id, _name, _ops, en_reg, en_bit, dvba_reg, dvb_mask)   \
	[LTC3676_ ## _id] = {                                        \
		.name = #_name,                                \
		.of_match = of_match_ptr(#_name),              \
		.regulators_node = of_match_ptr("regulators"), \
		.of_parse_cb = ltc3676_of_parse_cb,            \
		.n_voltages = (dvb_mask) + 1,                  \
		.min_uV = (dvba_reg) ? 412500 : 0,             \
		.uV_step = (dvba_reg) ? 12500 : 0,             \
		.ramp_delay = (dvba_reg) ? 800 : 0,            \
		.fixed_uV = (dvb_mask) ? 0 : 725000,           \
		.ops = &ltc3676_ ## _ops ## _regulator_ops,    \
		.type = REGULATOR_VOLTAGE,                     \
		.id = LTC3676_ ## _id,                         \
		.owner = THIS_MODULE,                          \
		.vsel_reg = (dvba_reg),                        \
		.vsel_mask = (dvb_mask),                       \
		.enable_reg = (en_reg),                        \
		.enable_mask = (1 << en_bit),                  \
	}

#define LTC3676_LINEAR_REG(_id, _name, _en, _dvba)                     \
	LTC3676_REG(_id, _name, linear,                                \
		    LTC3676_ ## _en, 7,                                \
		    LTC3676_ ## _dvba, 0x1f)

#define LTC3676_FIXED_REG(_id, _name, _en_reg, _en_bit)                \
	LTC3676_REG(_id, _name, fixed, LTC3676_ ## _en_reg, _en_bit, 0, 0)

static const struct regulator_desc ltc3676_regulators[LTC3676_NUM_REGULATORS] = {
	LTC3676_LINEAR_REG(SW1, sw1, BUCK1, DVB1A),
	LTC3676_LINEAR_REG(SW2, sw2, BUCK2, DVB2A),
	LTC3676_LINEAR_REG(SW3, sw3, BUCK3, DVB3A),
	LTC3676_LINEAR_REG(SW4, sw4, BUCK4, DVB4A),
	LTC3676_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
	LTC3676_FIXED_REG(LDO2, ldo2, LDOA, 2),
	LTC3676_FIXED_REG(LDO3, ldo3, LDOA, 5),
	LTC3676_FIXED_REG(LDO4, ldo4, LDOB, 2),
};

static bool ltc3676_readable_writeable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case LTC3676_BUCK1 ... LTC3676_IRQSTAT:
	case LTC3676_HRST:
	case LTC3676_CLIRQ:
		return true;
	}
	return false;
}

static bool ltc3676_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case LTC3676_IRQSTAT ... LTC3676_PGSTATRT:
		return true;
	}
	return false;
}

static const struct regmap_config ltc3676_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.writeable_reg = ltc3676_readable_writeable_reg,
	.readable_reg = ltc3676_readable_writeable_reg,
	.volatile_reg = ltc3676_volatile_reg,
	.max_register = LTC3676_CLIRQ,
	.use_single_read = true,
	.use_single_write = true,
	.cache_type = REGCACHE_RBTREE,
};

static irqreturn_t ltc3676_isr(int irq, void *dev_id)
{
	struct ltc3676 *ltc3676 = dev_id;
	struct device *dev = ltc3676->dev;
	unsigned int i, irqstat, event;

	regmap_read(ltc3676->regmap, LTC3676_IRQSTAT, &irqstat);

	dev_dbg(dev, "irq%d irqstat=0x%02x\n", irq, irqstat);
	if (irqstat & LTC3676_IRQSTAT_THERMAL_WARN) {
		dev_warn(dev, "Over-temperature Warning\n");
		event = REGULATOR_EVENT_OVER_TEMP;
		for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
			regulator_notifier_call_chain(ltc3676->regulators[i],
						      event, NULL);
	}

	if (irqstat & LTC3676_IRQSTAT_UNDERVOLT_WARN) {
		dev_info(dev, "Undervoltage Warning\n");
		event = REGULATOR_EVENT_UNDER_VOLTAGE;
		for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
			regulator_notifier_call_chain(ltc3676->regulators[i],
						      event, NULL);
	}

	/* Clear warning condition */
	regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);

	return IRQ_HANDLED;
}

static int ltc3676_regulator_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct regulator_init_data *init_data = dev_get_platdata(dev);
	struct regulator_desc *descs;
	struct ltc3676 *ltc3676;
	int i, ret;

	ltc3676 = devm_kzalloc(dev, sizeof(*ltc3676), GFP_KERNEL);
	if (!ltc3676)
		return -ENOMEM;

	i2c_set_clientdata(client, ltc3676);
	ltc3676->dev = dev;

	descs = ltc3676->regulator_descs;
	memcpy(descs, ltc3676_regulators, sizeof(ltc3676_regulators));
	descs[LTC3676_LDO3].fixed_uV = 1800000; /* LDO3 is fixed 1.8V */

	ltc3676->regmap = devm_regmap_init_i2c(client, &ltc3676_regmap_config);
	if (IS_ERR(ltc3676->regmap)) {
		ret = PTR_ERR(ltc3676->regmap);
		dev_err(dev, "failed to initialize regmap: %d\n", ret);
		return ret;
	}

	for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
		struct regulator_desc *desc = &ltc3676->regulator_descs[i];
		struct regulator_config config = { };

		if (init_data)
			config.init_data = &init_data[i];

		config.dev = dev;
		config.driver_data = ltc3676;

		ltc3676->regulators[i] = devm_regulator_register(dev, desc,
								 &config);
		if (IS_ERR(ltc3676->regulators[i])) {
			ret = PTR_ERR(ltc3676->regulators[i]);
			dev_err(dev, "failed to register regulator %s: %d\n",
				desc->name, ret);
			return ret;
		}
	}

	regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
	if (client->irq) {
		ret = devm_request_threaded_irq(dev, client->irq, NULL,
						ltc3676_isr,
						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
						client->name, ltc3676);
		if (ret) {
			dev_err(dev, "Failed to request IRQ: %d\n", ret);
			return ret;
		}
	}

	return 0;
}

static const struct i2c_device_id ltc3676_i2c_id[] = {
	{ "ltc3676" },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ltc3676_i2c_id);

static const struct of_device_id __maybe_unused ltc3676_of_match[] = {
	{ .compatible = "lltc,ltc3676" },
	{ },
};
MODULE_DEVICE_TABLE(of, ltc3676_of_match);

static struct i2c_driver ltc3676_driver = {
	.driver = {
		.name = DRIVER_NAME,
		.of_match_table = of_match_ptr(ltc3676_of_match),
	},
	.probe_new = ltc3676_regulator_probe,
	.id_table = ltc3676_i2c_id,
};
module_i2c_driver(ltc3676_driver);

MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC3676");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
37b918a0 TH	2	/*
37b918a0 TH	3	* Copyright (C) 2016 Gateworks Corporation, Inc. All Rights Reserved.
37b918a0 TH	4	*/
	5	#include <linux/i2c.h>
	6	#include <linux/init.h>
	7	#include <linux/interrupt.h>
	8	#include <linux/module.h>
	9	#include <linux/kernel.h>
	10	#include <linux/of.h>
	11	#include <linux/regmap.h>
	12	#include <linux/regulator/driver.h>
	13	#include <linux/regulator/machine.h>
	14	#include <linux/regulator/of_regulator.h>
	15
	16	#define DRIVER_NAME "ltc3676"
	17
	18	/* LTC3676 Registers */
	19	#define LTC3676_BUCK1 0x01
	20	#define LTC3676_BUCK2 0x02
	21	#define LTC3676_BUCK3 0x03
	22	#define LTC3676_BUCK4 0x04
	23	#define LTC3676_LDOA 0x05
	24	#define LTC3676_LDOB 0x06
	25	#define LTC3676_SQD1 0x07
	26	#define LTC3676_SQD2 0x08
	27	#define LTC3676_CNTRL 0x09
	28	#define LTC3676_DVB1A 0x0A
	29	#define LTC3676_DVB1B 0x0B
	30	#define LTC3676_DVB2A 0x0C
	31	#define LTC3676_DVB2B 0x0D
	32	#define LTC3676_DVB3A 0x0E
	33	#define LTC3676_DVB3B 0x0F
	34	#define LTC3676_DVB4A 0x10
	35	#define LTC3676_DVB4B 0x11
	36	#define LTC3676_MSKIRQ 0x12
	37	#define LTC3676_MSKPG 0x13
	38	#define LTC3676_USER 0x14
	39	#define LTC3676_IRQSTAT 0x15
	40	#define LTC3676_PGSTATL 0x16
	41	#define LTC3676_PGSTATRT 0x17
	42	#define LTC3676_HRST 0x1E
	43	#define LTC3676_CLIRQ 0x1F
	44
	45	#define LTC3676_DVBxA_REF_SELECT BIT(5)
d2a66ddf	46	#define LTC3676_DVBxB_PGOOD_MASK BIT(5)
37b918a0 TH	47
	48	#define LTC3676_IRQSTAT_PGOOD_TIMEOUT BIT(3)
	49	#define LTC3676_IRQSTAT_UNDERVOLT_WARN BIT(4)
	50	#define LTC3676_IRQSTAT_UNDERVOLT_FAULT BIT(5)
	51	#define LTC3676_IRQSTAT_THERMAL_WARN BIT(6)
	52	#define LTC3676_IRQSTAT_THERMAL_FAULT BIT(7)
	53
	54	enum ltc3676_reg {
	55	LTC3676_SW1,
	56	LTC3676_SW2,
	57	LTC3676_SW3,
	58	LTC3676_SW4,
	59	LTC3676_LDO1,
	60	LTC3676_LDO2,
	61	LTC3676_LDO3,
	62	LTC3676_LDO4,
	63	LTC3676_NUM_REGULATORS,
	64	};
	65
	66	struct ltc3676 {
	67	struct regmap *regmap;
	68	struct device *dev;
	69	struct regulator_desc regulator_descs[LTC3676_NUM_REGULATORS];
	70	struct regulator_dev *regulators[LTC3676_NUM_REGULATORS];
	71	};
	72
	73	static int ltc3676_set_suspend_voltage(struct regulator_dev *rdev, int uV)
	74	{
	75	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
	76	struct device *dev = ltc3676->dev;
	77	int dcdc = rdev_get_id(rdev);
	78	int sel;
	79
	80	dev_dbg(dev, "%s id=%d uV=%d\n", __func__, dcdc, uV);
	81	sel = regulator_map_voltage_linear(rdev, uV, uV);
	82	if (sel < 0)
	83	return sel;
	84
	85	/* DVBB register follows right after the corresponding DVBA register */
	86	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
	87	rdev->desc->vsel_mask, sel);
	88	}
	89
	90	static int ltc3676_set_suspend_mode(struct regulator_dev *rdev,
	91	unsigned int mode)
	92	{
	93	struct ltc3676 *ltc3676= rdev_get_drvdata(rdev);
	94	struct device *dev = ltc3676->dev;
	95	int mask, val;
	96	int dcdc = rdev_get_id(rdev);
	97
	98	dev_dbg(dev, "%s id=%d mode=%d\n", __func__, dcdc, mode);
	99
	100	mask = LTC3676_DVBxA_REF_SELECT;
	101	switch (mode) {
	102	case REGULATOR_MODE_STANDBY:
	103	val = 0; /* select DVBxA */
	104	break;
	105	case REGULATOR_MODE_NORMAL:
	106	val = LTC3676_DVBxA_REF_SELECT; /* select DVBxB */
	107	break;
	108	default:
	109	dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
	110	rdev->desc->name, mode);
111	return -EINVAL;
112	}
113
114	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg,
115	mask, val);
116	}
117
d2a66ddf MV	118	static int ltc3676_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
	119	{
	120	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
	121	struct device *dev = ltc3676->dev;
	122	int ret, dcdc = rdev_get_id(rdev);
	123
	124	dev_dbg(dev, "%s id=%d selector=%d\n", __func__, dcdc, selector);
	125
	126	ret = regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
	127	LTC3676_DVBxB_PGOOD_MASK,
	128	LTC3676_DVBxB_PGOOD_MASK);
	129	if (ret)
	130	return ret;
	131
	132	return regulator_set_voltage_sel_regmap(rdev, selector);
	133	}
	134
37b918a0 TH	135	static inline unsigned int ltc3676_scale(unsigned int uV, u32 r1, u32 r2)
	136	{
	137	uint64_t tmp;
	138	if (uV == 0)
	139	return 0;
	140	tmp = (uint64_t)uV * r1;
	141	do_div(tmp, r2);
	142	return uV + (unsigned int)tmp;
	143	}
	144
	145	static int ltc3676_of_parse_cb(struct device_node *np,
	146	const struct regulator_desc *desc,
	147	struct regulator_config *config)
	148	{
	149	struct ltc3676 *ltc3676 = config->driver_data;
	150	struct regulator_desc *rdesc = &ltc3676->regulator_descs[desc->id];
	151	u32 r[2];
	152	int ret;
	153
	154	/* LDO3 has a fixed output */
	155	if (desc->id == LTC3676_LDO3)
	156	return 0;
	157
	158	ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
	159	if (ret) {
	160	dev_err(ltc3676->dev, "Failed to parse voltage divider: %d\n",
	161	ret);
	162	return ret;
	163	}
	164
	165	rdesc->min_uV = ltc3676_scale(desc->min_uV, r[0], r[1]);
	166	rdesc->uV_step = ltc3676_scale(desc->uV_step, r[0], r[1]);
	167	rdesc->fixed_uV = ltc3676_scale(desc->fixed_uV, r[0], r[1]);
	168
	169	return 0;
	170	}
	171
	172	/* SW1, SW2, SW3, SW4 linear 0.8V-3.3V with scalar via R1/R2 feeback res */
f9e93acc	173	static const struct regulator_ops ltc3676_linear_regulator_ops = {
37b918a0 TH	174	.enable = regulator_enable_regmap,
	175	.disable = regulator_disable_regmap,
	176	.is_enabled = regulator_is_enabled_regmap,
	177	.list_voltage = regulator_list_voltage_linear,
d2a66ddf	178	.set_voltage_sel = ltc3676_set_voltage_sel,
37b918a0 TH	179	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	180	.set_suspend_voltage = ltc3676_set_suspend_voltage,
	181	.set_suspend_mode = ltc3676_set_suspend_mode,
	182	};
	183
	184	/* LDO1 always on fixed 0.8V-3.3V via scalar via R1/R2 feeback res */
f9e93acc	185	static const struct regulator_ops ltc3676_fixed_standby_regulator_ops = {
37b918a0 TH	186	};
	187
	188	/* LDO2, LDO3 fixed (LDO2 has external scalar via R1/R2 feedback res) */
f9e93acc	189	static const struct regulator_ops ltc3676_fixed_regulator_ops = {
37b918a0 TH	190	.enable = regulator_enable_regmap,
	191	.disable = regulator_disable_regmap,
	192	.is_enabled = regulator_is_enabled_regmap,
	193	};
	194
	195	#define LTC3676_REG(_id, _name, _ops, en_reg, en_bit, dvba_reg, dvb_mask) \
	196	[LTC3676_ ## _id] = { \
	197	.name = #_name, \
	198	.of_match = of_match_ptr(#_name), \
	199	.regulators_node = of_match_ptr("regulators"), \
	200	.of_parse_cb = ltc3676_of_parse_cb, \
	201	.n_voltages = (dvb_mask) + 1, \
	202	.min_uV = (dvba_reg) ? 412500 : 0, \
	203	.uV_step = (dvba_reg) ? 12500 : 0, \
	204	.ramp_delay = (dvba_reg) ? 800 : 0, \
	205	.fixed_uV = (dvb_mask) ? 0 : 725000, \
	206	.ops = &ltc3676_ ## _ops ## _regulator_ops, \
	207	.type = REGULATOR_VOLTAGE, \
	208	.id = LTC3676_ ## _id, \
	209	.owner = THIS_MODULE, \
	210	.vsel_reg = (dvba_reg), \
	211	.vsel_mask = (dvb_mask), \
	212	.enable_reg = (en_reg), \
	213	.enable_mask = (1 << en_bit), \
	214	}
	215
	216	#define LTC3676_LINEAR_REG(_id, _name, _en, _dvba) \
	217	LTC3676_REG(_id, _name, linear, \
	218	LTC3676_ ## _en, 7, \
	219	LTC3676_ ## _dvba, 0x1f)
	220
	221	#define LTC3676_FIXED_REG(_id, _name, _en_reg, _en_bit) \
	222	LTC3676_REG(_id, _name, fixed, LTC3676_ ## _en_reg, _en_bit, 0, 0)
	223
b37f076d	224	static const struct regulator_desc ltc3676_regulators[LTC3676_NUM_REGULATORS] = {
37b918a0 TH	225	LTC3676_LINEAR_REG(SW1, sw1, BUCK1, DVB1A),
	226	LTC3676_LINEAR_REG(SW2, sw2, BUCK2, DVB2A),
	227	LTC3676_LINEAR_REG(SW3, sw3, BUCK3, DVB3A),
	228	LTC3676_LINEAR_REG(SW4, sw4, BUCK4, DVB4A),
	229	LTC3676_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
	230	LTC3676_FIXED_REG(LDO2, ldo2, LDOA, 2),
	231	LTC3676_FIXED_REG(LDO3, ldo3, LDOA, 5),
	232	LTC3676_FIXED_REG(LDO4, ldo4, LDOB, 2),
	233	};
	234
502aba81	235	static bool ltc3676_readable_writeable_reg(struct device *dev, unsigned int reg)
37b918a0 TH	236	{
37b918a0 TH	237	switch (reg) {
502aba81	238	case LTC3676_BUCK1 ... LTC3676_IRQSTAT:
37b918a0 TH	239	case LTC3676_HRST:
	240	case LTC3676_CLIRQ:
	241	return true;
	242	}
	243	return false;
	244	}
	245
	246	static bool ltc3676_volatile_reg(struct device *dev, unsigned int reg)
	247	{
	248	switch (reg) {
502aba81	249	case LTC3676_IRQSTAT ... LTC3676_PGSTATRT:
37b918a0 TH	250	return true;
	251	}
	252	return false;
	253	}
	254
	255	static const struct regmap_config ltc3676_regmap_config = {
	256	.reg_bits = 8,
	257	.val_bits = 8,
502aba81 AL	258	.writeable_reg = ltc3676_readable_writeable_reg,
502aba81 AL	259	.readable_reg = ltc3676_readable_writeable_reg,
37b918a0 TH	260	.volatile_reg = ltc3676_volatile_reg,
37b918a0 TH	261	.max_register = LTC3676_CLIRQ,
1c96a2f6 DF	262	.use_single_read = true,
1c96a2f6 DF	263	.use_single_write = true,
37b918a0 TH	264	.cache_type = REGCACHE_RBTREE,
	265	};
	266
	267	static irqreturn_t ltc3676_isr(int irq, void *dev_id)
	268	{
	269	struct ltc3676 *ltc3676 = dev_id;
	270	struct device *dev = ltc3676->dev;
	271	unsigned int i, irqstat, event;
	272
	273	regmap_read(ltc3676->regmap, LTC3676_IRQSTAT, &irqstat);
	274
	275	dev_dbg(dev, "irq%d irqstat=0x%02x\n", irq, irqstat);
	276	if (irqstat & LTC3676_IRQSTAT_THERMAL_WARN) {
	277	dev_warn(dev, "Over-temperature Warning\n");
	278	event = REGULATOR_EVENT_OVER_TEMP;
e9c142b0	279	for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
37b918a0 TH	280	regulator_notifier_call_chain(ltc3676->regulators[i],
	281	event, NULL);
	282	}
	283
	284	if (irqstat & LTC3676_IRQSTAT_UNDERVOLT_WARN) {
	285	dev_info(dev, "Undervoltage Warning\n");
	286	event = REGULATOR_EVENT_UNDER_VOLTAGE;
e9c142b0	287	for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
37b918a0 TH	288	regulator_notifier_call_chain(ltc3676->regulators[i],
	289	event, NULL);
	290	}
	291
	292	/* Clear warning condition */
	293	regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
	294
	295	return IRQ_HANDLED;
	296	}
	297
77e29598	298	static int ltc3676_regulator_probe(struct i2c_client *client)
37b918a0 TH	299	{
	300	struct device *dev = &client->dev;
	301	struct regulator_init_data *init_data = dev_get_platdata(dev);
	302	struct regulator_desc *descs;
	303	struct ltc3676 *ltc3676;
	304	int i, ret;
	305
	306	ltc3676 = devm_kzalloc(dev, sizeof(*ltc3676), GFP_KERNEL);
	307	if (!ltc3676)
	308	return -ENOMEM;
	309
	310	i2c_set_clientdata(client, ltc3676);
	311	ltc3676->dev = dev;
	312
	313	descs = ltc3676->regulator_descs;
	314	memcpy(descs, ltc3676_regulators, sizeof(ltc3676_regulators));
	315	descs[LTC3676_LDO3].fixed_uV = 1800000; /* LDO3 is fixed 1.8V */
	316
	317	ltc3676->regmap = devm_regmap_init_i2c(client, &ltc3676_regmap_config);
	318	if (IS_ERR(ltc3676->regmap)) {
	319	ret = PTR_ERR(ltc3676->regmap);
	320	dev_err(dev, "failed to initialize regmap: %d\n", ret);
	321	return ret;
	322	}
	323
	324	for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
	325	struct regulator_desc *desc = &ltc3676->regulator_descs[i];
	326	struct regulator_config config = { };
	327
	328	if (init_data)
	329	config.init_data = &init_data[i];
	330
	331	config.dev = dev;
	332	config.driver_data = ltc3676;
	333
	334	ltc3676->regulators[i] = devm_regulator_register(dev, desc,
	335	&config);
	336	if (IS_ERR(ltc3676->regulators[i])) {
	337	ret = PTR_ERR(ltc3676->regulators[i]);
	338	dev_err(dev, "failed to register regulator %s: %d\n",
	339	desc->name, ret);
	340	return ret;
	341	}
	342	}
	343
	344	regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
	345	if (client->irq) {
	346	ret = devm_request_threaded_irq(dev, client->irq, NULL,
	347	ltc3676_isr,
	348	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	349	client->name, ltc3676);
	350	if (ret) {
	351	dev_err(dev, "Failed to request IRQ: %d\n", ret);
	352	return ret;
	353	}
	354	}
	355
	356	return 0;
	357	}
	358
	359	static const struct i2c_device_id ltc3676_i2c_id[] = {
	360	{ "ltc3676" },
	361	{ }
	362	};
363	MODULE_DEVICE_TABLE(i2c, ltc3676_i2c_id);
364
1d4c1e02	365	static const struct of_device_id __maybe_unused ltc3676_of_match[] = {
c3143415 JMC	366	{ .compatible = "lltc,ltc3676" },
	367	{ },
	368	};
	369	MODULE_DEVICE_TABLE(of, ltc3676_of_match);
	370
37b918a0 TH	371	static struct i2c_driver ltc3676_driver = {
	372	.driver = {
	373	.name = DRIVER_NAME,
c3143415	374	.of_match_table = of_match_ptr(ltc3676_of_match),
37b918a0	375	},
77e29598	376	.probe_new = ltc3676_regulator_probe,
37b918a0 TH	377	.id_table = ltc3676_i2c_id,
	378	};
	379	module_i2c_driver(ltc3676_driver);
	380
	381	MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
d422234f	382	MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC3676");
37b918a0	383	MODULE_LICENSE("GPL v2");