[linux-2.6-block.git] / drivers / regulator / ltc3676.c

/*
 * Copyright (C) 2016 Gateworks Corporation, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */
#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 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_writeable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case LTC3676_IRQSTAT:
	case LTC3676_BUCK1:
	case LTC3676_BUCK2:
	case LTC3676_BUCK3:
	case LTC3676_BUCK4:
	case LTC3676_LDOA:
	case LTC3676_LDOB:
	case LTC3676_SQD1:
	case LTC3676_SQD2:
	case LTC3676_CNTRL:
	case LTC3676_DVB1A:
	case LTC3676_DVB1B:
	case LTC3676_DVB2A:
	case LTC3676_DVB2B:
	case LTC3676_DVB3A:
	case LTC3676_DVB3B:
	case LTC3676_DVB4A:
	case LTC3676_DVB4B:
	case LTC3676_MSKIRQ:
	case LTC3676_MSKPG:
	case LTC3676_USER:
	case LTC3676_HRST:
	case LTC3676_CLIRQ:
		return true;
	}
	return false;
}

static bool ltc3676_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case LTC3676_IRQSTAT:
	case LTC3676_BUCK1:
	case LTC3676_BUCK2:
	case LTC3676_BUCK3:
	case LTC3676_BUCK4:
	case LTC3676_LDOA:
	case LTC3676_LDOB:
	case LTC3676_SQD1:
	case LTC3676_SQD2:
	case LTC3676_CNTRL:
	case LTC3676_DVB1A:
	case LTC3676_DVB1B:
	case LTC3676_DVB2A:
	case LTC3676_DVB2B:
	case LTC3676_DVB3A:
	case LTC3676_DVB3B:
	case LTC3676_DVB4A:
	case LTC3676_DVB4B:
	case LTC3676_MSKIRQ:
	case LTC3676_MSKPG:
	case LTC3676_USER:
	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:
	case LTC3676_PGSTATL:
	case LTC3676_PGSTATRT:
		return true;
	}
	return false;
}

static const struct regmap_config ltc3676_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.writeable_reg = ltc3676_writeable_reg,
	.readable_reg = ltc3676_readable_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,
				    const struct i2c_device_id *id)
{
	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 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 = 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 LTC1376");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
37b918a0 TH	1	/*
	2	* Copyright (C) 2016 Gateworks Corporation, Inc. All Rights Reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2
	6	* as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	*/
	14	#include <linux/i2c.h>
	15	#include <linux/init.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/module.h>
	18	#include <linux/kernel.h>
	19	#include <linux/of.h>
	20	#include <linux/regmap.h>
	21	#include <linux/regulator/driver.h>
	22	#include <linux/regulator/machine.h>
	23	#include <linux/regulator/of_regulator.h>
	24
	25	#define DRIVER_NAME "ltc3676"
	26
	27	/* LTC3676 Registers */
	28	#define LTC3676_BUCK1 0x01
	29	#define LTC3676_BUCK2 0x02
	30	#define LTC3676_BUCK3 0x03
	31	#define LTC3676_BUCK4 0x04
	32	#define LTC3676_LDOA 0x05
	33	#define LTC3676_LDOB 0x06
	34	#define LTC3676_SQD1 0x07
	35	#define LTC3676_SQD2 0x08
	36	#define LTC3676_CNTRL 0x09
	37	#define LTC3676_DVB1A 0x0A
	38	#define LTC3676_DVB1B 0x0B
	39	#define LTC3676_DVB2A 0x0C
	40	#define LTC3676_DVB2B 0x0D
	41	#define LTC3676_DVB3A 0x0E
	42	#define LTC3676_DVB3B 0x0F
	43	#define LTC3676_DVB4A 0x10
	44	#define LTC3676_DVB4B 0x11
	45	#define LTC3676_MSKIRQ 0x12
	46	#define LTC3676_MSKPG 0x13
	47	#define LTC3676_USER 0x14
	48	#define LTC3676_IRQSTAT 0x15
	49	#define LTC3676_PGSTATL 0x16
	50	#define LTC3676_PGSTATRT 0x17
	51	#define LTC3676_HRST 0x1E
	52	#define LTC3676_CLIRQ 0x1F
	53
	54	#define LTC3676_DVBxA_REF_SELECT BIT(5)
d2a66ddf	55	#define LTC3676_DVBxB_PGOOD_MASK BIT(5)
37b918a0 TH	56
	57	#define LTC3676_IRQSTAT_PGOOD_TIMEOUT BIT(3)
	58	#define LTC3676_IRQSTAT_UNDERVOLT_WARN BIT(4)
	59	#define LTC3676_IRQSTAT_UNDERVOLT_FAULT BIT(5)
	60	#define LTC3676_IRQSTAT_THERMAL_WARN BIT(6)
	61	#define LTC3676_IRQSTAT_THERMAL_FAULT BIT(7)
	62
	63	enum ltc3676_reg {
	64	LTC3676_SW1,
	65	LTC3676_SW2,
	66	LTC3676_SW3,
	67	LTC3676_SW4,
	68	LTC3676_LDO1,
	69	LTC3676_LDO2,
	70	LTC3676_LDO3,
	71	LTC3676_LDO4,
	72	LTC3676_NUM_REGULATORS,
	73	};
	74
	75	struct ltc3676 {
	76	struct regmap *regmap;
	77	struct device *dev;
	78	struct regulator_desc regulator_descs[LTC3676_NUM_REGULATORS];
	79	struct regulator_dev *regulators[LTC3676_NUM_REGULATORS];
	80	};
	81
	82	static int ltc3676_set_suspend_voltage(struct regulator_dev *rdev, int uV)
	83	{
	84	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
	85	struct device *dev = ltc3676->dev;
	86	int dcdc = rdev_get_id(rdev);
	87	int sel;
	88
	89	dev_dbg(dev, "%s id=%d uV=%d\n", __func__, dcdc, uV);
	90	sel = regulator_map_voltage_linear(rdev, uV, uV);
	91	if (sel < 0)
	92	return sel;
	93
	94	/* DVBB register follows right after the corresponding DVBA register */
	95	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
	96	rdev->desc->vsel_mask, sel);
	97	}
	98
	99	static int ltc3676_set_suspend_mode(struct regulator_dev *rdev,
	100	unsigned int mode)
	101	{
	102	struct ltc3676 *ltc3676= rdev_get_drvdata(rdev);
	103	struct device *dev = ltc3676->dev;
	104	int mask, val;
	105	int dcdc = rdev_get_id(rdev);
	106
	107	dev_dbg(dev, "%s id=%d mode=%d\n", __func__, dcdc, mode);
	108
	109	mask = LTC3676_DVBxA_REF_SELECT;
	110	switch (mode) {
	111	case REGULATOR_MODE_STANDBY:
	112	val = 0; /* select DVBxA */
	113	break;
	114	case REGULATOR_MODE_NORMAL:
	115	val = LTC3676_DVBxA_REF_SELECT; /* select DVBxB */
	116	break;
	117	default:
	118	dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
	119	rdev->desc->name, mode);
120	return -EINVAL;
121	}
122
123	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg,
124	mask, val);
125	}
126
d2a66ddf MV	127	static int ltc3676_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
	128	{
	129	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
	130	struct device *dev = ltc3676->dev;
	131	int ret, dcdc = rdev_get_id(rdev);
	132
	133	dev_dbg(dev, "%s id=%d selector=%d\n", __func__, dcdc, selector);
	134
	135	ret = regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
	136	LTC3676_DVBxB_PGOOD_MASK,
	137	LTC3676_DVBxB_PGOOD_MASK);
	138	if (ret)
	139	return ret;
	140
	141	return regulator_set_voltage_sel_regmap(rdev, selector);
	142	}
	143
37b918a0 TH	144	static inline unsigned int ltc3676_scale(unsigned int uV, u32 r1, u32 r2)
	145	{
	146	uint64_t tmp;
	147	if (uV == 0)
	148	return 0;
	149	tmp = (uint64_t)uV * r1;
	150	do_div(tmp, r2);
	151	return uV + (unsigned int)tmp;
	152	}
	153
	154	static int ltc3676_of_parse_cb(struct device_node *np,
	155	const struct regulator_desc *desc,
	156	struct regulator_config *config)
	157	{
	158	struct ltc3676 *ltc3676 = config->driver_data;
	159	struct regulator_desc *rdesc = &ltc3676->regulator_descs[desc->id];
	160	u32 r[2];
	161	int ret;
	162
	163	/* LDO3 has a fixed output */
	164	if (desc->id == LTC3676_LDO3)
	165	return 0;
	166
	167	ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
	168	if (ret) {
	169	dev_err(ltc3676->dev, "Failed to parse voltage divider: %d\n",
	170	ret);
	171	return ret;
	172	}
	173
	174	rdesc->min_uV = ltc3676_scale(desc->min_uV, r[0], r[1]);
	175	rdesc->uV_step = ltc3676_scale(desc->uV_step, r[0], r[1]);
	176	rdesc->fixed_uV = ltc3676_scale(desc->fixed_uV, r[0], r[1]);
	177
	178	return 0;
	179	}
	180
	181	/* SW1, SW2, SW3, SW4 linear 0.8V-3.3V with scalar via R1/R2 feeback res */
f9e93acc	182	static const struct regulator_ops ltc3676_linear_regulator_ops = {
37b918a0 TH	183	.enable = regulator_enable_regmap,
	184	.disable = regulator_disable_regmap,
	185	.is_enabled = regulator_is_enabled_regmap,
	186	.list_voltage = regulator_list_voltage_linear,
d2a66ddf	187	.set_voltage_sel = ltc3676_set_voltage_sel,
37b918a0 TH	188	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	189	.set_suspend_voltage = ltc3676_set_suspend_voltage,
	190	.set_suspend_mode = ltc3676_set_suspend_mode,
	191	};
	192
	193	/* LDO1 always on fixed 0.8V-3.3V via scalar via R1/R2 feeback res */
f9e93acc	194	static const struct regulator_ops ltc3676_fixed_standby_regulator_ops = {
37b918a0 TH	195	};
	196
	197	/* LDO2, LDO3 fixed (LDO2 has external scalar via R1/R2 feedback res) */
f9e93acc	198	static const struct regulator_ops ltc3676_fixed_regulator_ops = {
37b918a0 TH	199	.enable = regulator_enable_regmap,
	200	.disable = regulator_disable_regmap,
	201	.is_enabled = regulator_is_enabled_regmap,
	202	};
	203
	204	#define LTC3676_REG(_id, _name, _ops, en_reg, en_bit, dvba_reg, dvb_mask) \
	205	[LTC3676_ ## _id] = { \
	206	.name = #_name, \
	207	.of_match = of_match_ptr(#_name), \
	208	.regulators_node = of_match_ptr("regulators"), \
	209	.of_parse_cb = ltc3676_of_parse_cb, \
	210	.n_voltages = (dvb_mask) + 1, \
	211	.min_uV = (dvba_reg) ? 412500 : 0, \
	212	.uV_step = (dvba_reg) ? 12500 : 0, \
	213	.ramp_delay = (dvba_reg) ? 800 : 0, \
	214	.fixed_uV = (dvb_mask) ? 0 : 725000, \
	215	.ops = &ltc3676_ ## _ops ## _regulator_ops, \
	216	.type = REGULATOR_VOLTAGE, \
	217	.id = LTC3676_ ## _id, \
	218	.owner = THIS_MODULE, \
	219	.vsel_reg = (dvba_reg), \
	220	.vsel_mask = (dvb_mask), \
	221	.enable_reg = (en_reg), \
	222	.enable_mask = (1 << en_bit), \
	223	}
	224
	225	#define LTC3676_LINEAR_REG(_id, _name, _en, _dvba) \
	226	LTC3676_REG(_id, _name, linear, \
	227	LTC3676_ ## _en, 7, \
	228	LTC3676_ ## _dvba, 0x1f)
	229
	230	#define LTC3676_FIXED_REG(_id, _name, _en_reg, _en_bit) \
	231	LTC3676_REG(_id, _name, fixed, LTC3676_ ## _en_reg, _en_bit, 0, 0)
	232
	233	static struct regulator_desc ltc3676_regulators[LTC3676_NUM_REGULATORS] = {
	234	LTC3676_LINEAR_REG(SW1, sw1, BUCK1, DVB1A),
	235	LTC3676_LINEAR_REG(SW2, sw2, BUCK2, DVB2A),
	236	LTC3676_LINEAR_REG(SW3, sw3, BUCK3, DVB3A),
	237	LTC3676_LINEAR_REG(SW4, sw4, BUCK4, DVB4A),
	238	LTC3676_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
	239	LTC3676_FIXED_REG(LDO2, ldo2, LDOA, 2),
	240	LTC3676_FIXED_REG(LDO3, ldo3, LDOA, 5),
	241	LTC3676_FIXED_REG(LDO4, ldo4, LDOB, 2),
	242	};
	243
	244	static bool ltc3676_writeable_reg(struct device *dev, unsigned int reg)
	245	{
	246	switch (reg) {
	247	case LTC3676_IRQSTAT:
	248	case LTC3676_BUCK1:
	249	case LTC3676_BUCK2:
	250	case LTC3676_BUCK3:
	251	case LTC3676_BUCK4:
	252	case LTC3676_LDOA:
	253	case LTC3676_LDOB:
	254	case LTC3676_SQD1:
	255	case LTC3676_SQD2:
	256	case LTC3676_CNTRL:
	257	case LTC3676_DVB1A:
	258	case LTC3676_DVB1B:
	259	case LTC3676_DVB2A:
	260	case LTC3676_DVB2B:
	261	case LTC3676_DVB3A:
	262	case LTC3676_DVB3B:
263	case LTC3676_DVB4A:
264	case LTC3676_DVB4B:
265	case LTC3676_MSKIRQ:
266	case LTC3676_MSKPG:
267	case LTC3676_USER:
268	case LTC3676_HRST:
269	case LTC3676_CLIRQ:
270	return true;
271	}
272	return false;
273	}
274
275	static bool ltc3676_readable_reg(struct device *dev, unsigned int reg)
276	{
277	switch (reg) {
278	case LTC3676_IRQSTAT:
279	case LTC3676_BUCK1:
280	case LTC3676_BUCK2:
281	case LTC3676_BUCK3:
282	case LTC3676_BUCK4:
283	case LTC3676_LDOA:
284	case LTC3676_LDOB:
285	case LTC3676_SQD1:
286	case LTC3676_SQD2:
287	case LTC3676_CNTRL:
288	case LTC3676_DVB1A:
289	case LTC3676_DVB1B:
290	case LTC3676_DVB2A:
291	case LTC3676_DVB2B:
292	case LTC3676_DVB3A:
293	case LTC3676_DVB3B:
294	case LTC3676_DVB4A:
295	case LTC3676_DVB4B:
296	case LTC3676_MSKIRQ:
297	case LTC3676_MSKPG:
298	case LTC3676_USER:
299	case LTC3676_HRST:
300	case LTC3676_CLIRQ:
301	return true;
302	}
303	return false;
304	}
305
306	static bool ltc3676_volatile_reg(struct device *dev, unsigned int reg)
307	{
308	switch (reg) {
309	case LTC3676_IRQSTAT:
310	case LTC3676_PGSTATL:
311	case LTC3676_PGSTATRT:
312	return true;
313	}
314	return false;
315	}
316
317	static const struct regmap_config ltc3676_regmap_config = {
318	.reg_bits = 8,
319	.val_bits = 8,
320	.writeable_reg = ltc3676_writeable_reg,
321	.readable_reg = ltc3676_readable_reg,
322	.volatile_reg = ltc3676_volatile_reg,
323	.max_register = LTC3676_CLIRQ,
1c96a2f6 DF	324	.use_single_read = true,
1c96a2f6 DF	325	.use_single_write = true,
37b918a0 TH	326	.cache_type = REGCACHE_RBTREE,
	327	};
	328
	329	static irqreturn_t ltc3676_isr(int irq, void *dev_id)
	330	{
	331	struct ltc3676 *ltc3676 = dev_id;
	332	struct device *dev = ltc3676->dev;
	333	unsigned int i, irqstat, event;
	334
	335	regmap_read(ltc3676->regmap, LTC3676_IRQSTAT, &irqstat);
	336
	337	dev_dbg(dev, "irq%d irqstat=0x%02x\n", irq, irqstat);
	338	if (irqstat & LTC3676_IRQSTAT_THERMAL_WARN) {
	339	dev_warn(dev, "Over-temperature Warning\n");
	340	event = REGULATOR_EVENT_OVER_TEMP;
	341	for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
	342	regulator_notifier_call_chain(ltc3676->regulators[i],
	343	event, NULL);
	344	}
	345
	346	if (irqstat & LTC3676_IRQSTAT_UNDERVOLT_WARN) {
	347	dev_info(dev, "Undervoltage Warning\n");
	348	event = REGULATOR_EVENT_UNDER_VOLTAGE;
	349	for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
	350	regulator_notifier_call_chain(ltc3676->regulators[i],
	351	event, NULL);
	352	}
	353
	354	/* Clear warning condition */
	355	regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
	356
	357	return IRQ_HANDLED;
	358	}
	359
	360	static int ltc3676_regulator_probe(struct i2c_client *client,
	361	const struct i2c_device_id *id)
	362	{
	363	struct device *dev = &client->dev;
	364	struct regulator_init_data *init_data = dev_get_platdata(dev);
	365	struct regulator_desc *descs;
	366	struct ltc3676 *ltc3676;
	367	int i, ret;
	368
	369	ltc3676 = devm_kzalloc(dev, sizeof(*ltc3676), GFP_KERNEL);
	370	if (!ltc3676)
	371	return -ENOMEM;
	372
	373	i2c_set_clientdata(client, ltc3676);
	374	ltc3676->dev = dev;
	375
	376	descs = ltc3676->regulator_descs;
	377	memcpy(descs, ltc3676_regulators, sizeof(ltc3676_regulators));
	378	descs[LTC3676_LDO3].fixed_uV = 1800000; /* LDO3 is fixed 1.8V */
	379
	380	ltc3676->regmap = devm_regmap_init_i2c(client, &ltc3676_regmap_config);
	381	if (IS_ERR(ltc3676->regmap)) {
	382	ret = PTR_ERR(ltc3676->regmap);
	383	dev_err(dev, "failed to initialize regmap: %d\n", ret);
	384	return ret;
	385	}
	386
	387	for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
	388	struct regulator_desc *desc = &ltc3676->regulator_descs[i];
	389	struct regulator_config config = { };
390
391	if (init_data)
392	config.init_data = &init_data[i];
393
394	config.dev = dev;
395	config.driver_data = ltc3676;
396
397	ltc3676->regulators[i] = devm_regulator_register(dev, desc,
398	&config);
399	if (IS_ERR(ltc3676->regulators[i])) {
400	ret = PTR_ERR(ltc3676->regulators[i]);
401	dev_err(dev, "failed to register regulator %s: %d\n",
402	desc->name, ret);
403	return ret;
404	}
405	}
406
407	regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
408	if (client->irq) {
409	ret = devm_request_threaded_irq(dev, client->irq, NULL,
410	ltc3676_isr,
411	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
412	client->name, ltc3676);
413	if (ret) {
414	dev_err(dev, "Failed to request IRQ: %d\n", ret);
415	return ret;
416	}
417	}
418
419	return 0;
420	}
421
422	static const struct i2c_device_id ltc3676_i2c_id[] = {
423	{ "ltc3676" },
424	{ }
425	};
426	MODULE_DEVICE_TABLE(i2c, ltc3676_i2c_id);
427
c3143415 JMC	428	static const struct of_device_id ltc3676_of_match[] = {
	429	{ .compatible = "lltc,ltc3676" },
	430	{ },
	431	};
	432	MODULE_DEVICE_TABLE(of, ltc3676_of_match);
	433
37b918a0 TH	434	static struct i2c_driver ltc3676_driver = {
	435	.driver = {
	436	.name = DRIVER_NAME,
c3143415	437	.of_match_table = of_match_ptr(ltc3676_of_match),
37b918a0 TH	438	},
	439	.probe = ltc3676_regulator_probe,
	440	.id_table = ltc3676_i2c_id,
	441	};
	442	module_i2c_driver(ltc3676_driver);
	443
	444	MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
	445	MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC1376");
	446	MODULE_LICENSE("GPL v2");