[linux-2.6-block.git] / drivers / regulator / da9211-regulator.c

/*
 * da9211-regulator.c - Regulator device driver for DA9211/DA9212
 * /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
 * Copyright (C) 2015  Dialog Semiconductor Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regmap.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/da9211.h>
#include "da9211-regulator.h"

/* DEVICE IDs */
#define DA9211_DEVICE_ID	0x22
#define DA9213_DEVICE_ID	0x23
#define DA9215_DEVICE_ID	0x24

#define DA9211_BUCK_MODE_SLEEP	1
#define DA9211_BUCK_MODE_SYNC	2
#define DA9211_BUCK_MODE_AUTO	3

/* DA9211 REGULATOR IDs */
#define DA9211_ID_BUCKA	0
#define DA9211_ID_BUCKB	1

struct da9211 {
	struct device *dev;
	struct regmap *regmap;
	struct da9211_pdata *pdata;
	struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
	int num_regulator;
	int chip_irq;
	int chip_id;
};

static const struct regmap_range_cfg da9211_regmap_range[] = {
	{
		.selector_reg = DA9211_REG_PAGE_CON,
		.selector_mask  = DA9211_REG_PAGE_MASK,
		.selector_shift = DA9211_REG_PAGE_SHIFT,
		.window_start = 0,
		.window_len = 256,
		.range_min = 0,
		.range_max = 5*128,
	},
};

static const struct regmap_config da9211_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 5 * 128,
	.ranges = da9211_regmap_range,
	.num_ranges = ARRAY_SIZE(da9211_regmap_range),
};

/* Default limits measured in millivolts and milliamps */
#define DA9211_MIN_MV		300
#define DA9211_MAX_MV		1570
#define DA9211_STEP_MV		10

/* Current limits for DA9211 buck (uA) indices
 * corresponds with register values
 */
static const int da9211_current_limits[] = {
	2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
	3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
};
/* Current limits for DA9213 buck (uA) indices
 * corresponds with register values
 */
static const int da9213_current_limits[] = {
	3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
	4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
};
/* Current limits for DA9215 buck (uA) indices
 * corresponds with register values
 */
static const int da9215_current_limits[] = {
	4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
	5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
};

static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret, mode = 0;

	ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
	if (ret < 0)
		return ret;

	switch (data & 0x03) {
	case DA9211_BUCK_MODE_SYNC:
		mode = REGULATOR_MODE_FAST;
		break;
	case DA9211_BUCK_MODE_AUTO:
		mode = REGULATOR_MODE_NORMAL;
		break;
	case DA9211_BUCK_MODE_SLEEP:
		mode = REGULATOR_MODE_STANDBY;
		break;
	}

	return mode;
}

static int da9211_buck_set_mode(struct regulator_dev *rdev,
					unsigned int mode)
{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = DA9211_BUCK_MODE_SYNC;
		break;
	case REGULATOR_MODE_NORMAL:
		val = DA9211_BUCK_MODE_AUTO;
		break;
	case REGULATOR_MODE_STANDBY:
		val = DA9211_BUCK_MODE_SLEEP;
		break;
	}

	return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
					0x03, val);
}

static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
				    int max)
{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	int i, max_size;
	const int *current_limits;

	switch (chip->chip_id) {
	case DA9211:
		current_limits = da9211_current_limits;
		max_size = ARRAY_SIZE(da9211_current_limits)-1;
		break;
	case DA9213:
		current_limits = da9213_current_limits;
		max_size = ARRAY_SIZE(da9213_current_limits)-1;
		break;
	case DA9215:
		current_limits = da9215_current_limits;
		max_size = ARRAY_SIZE(da9215_current_limits)-1;
		break;
	default:
		return -EINVAL;
	}

	/* search for closest to maximum */
	for (i = max_size; i >= 0; i--) {
		if (min <= current_limits[i] &&
		    max >= current_limits[i]) {
				return regmap_update_bits(chip->regmap,
					DA9211_REG_BUCK_ILIM,
					(0x0F << id*4), (i << id*4));
		}
	}

	return -EINVAL;
}

static int da9211_get_current_limit(struct regulator_dev *rdev)
{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret;
	const int *current_limits;

	switch (chip->chip_id) {
	case DA9211:
		current_limits = da9211_current_limits;
		break;
	case DA9213:
		current_limits = da9213_current_limits;
		break;
	case DA9215:
		current_limits = da9215_current_limits;
		break;
	default:
		return -EINVAL;
	}

	ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
	if (ret < 0)
		return ret;

	/* select one of 16 values: 0000 (2000mA or 3000mA)
	 * to 1111 (5000mA or 6000mA).
	 */
	data = (data >> id*4) & 0x0F;
	return current_limits[data];
}

static const struct regulator_ops da9211_buck_ops = {
	.get_mode = da9211_buck_get_mode,
	.set_mode = da9211_buck_set_mode,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_current_limit = da9211_set_current_limit,
	.get_current_limit = da9211_get_current_limit,
};

#define DA9211_BUCK(_id) \
{\
	.name = #_id,\
	.ops = &da9211_buck_ops,\
	.type = REGULATOR_VOLTAGE,\
	.id = DA9211_ID_##_id,\
	.n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
	.min_uV = (DA9211_MIN_MV * 1000),\
	.uV_step = (DA9211_STEP_MV * 1000),\
	.enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
	.enable_mask = DA9211_BUCKA_EN,\
	.vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
	.vsel_mask = DA9211_VBUCK_MASK,\
	.owner = THIS_MODULE,\
}

static struct regulator_desc da9211_regulators[] = {
	DA9211_BUCK(BUCKA),
	DA9211_BUCK(BUCKB),
};

#ifdef CONFIG_OF
static struct of_regulator_match da9211_matches[] = {
	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
	};

static struct da9211_pdata *da9211_parse_regulators_dt(
		struct device *dev)
{
	struct da9211_pdata *pdata;
	struct device_node *node;
	int i, num, n;

	node = of_get_child_by_name(dev->of_node, "regulators");
	if (!node) {
		dev_err(dev, "regulators node not found\n");
		return ERR_PTR(-ENODEV);
	}

	num = of_regulator_match(dev, node, da9211_matches,
				 ARRAY_SIZE(da9211_matches));
	of_node_put(node);
	if (num < 0) {
		dev_err(dev, "Failed to match regulators\n");
		return ERR_PTR(-EINVAL);
	}

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

	pdata->num_buck = num;

	n = 0;
	for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
		if (!da9211_matches[i].init_data)
			continue;

		pdata->init_data[n] = da9211_matches[i].init_data;
		pdata->reg_node[n] = da9211_matches[i].of_node;
		pdata->gpiod_ren[n] = devm_gpiod_get_from_of_node(dev,
				  da9211_matches[i].of_node,
				  "enable",
				  0,
				  GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE,
				  "da9211-enable");
		n++;
	}

	return pdata;
}
#else
static struct da9211_pdata *da9211_parse_regulators_dt(
		struct device *dev)
{
	return ERR_PTR(-ENODEV);
}
#endif

static irqreturn_t da9211_irq_handler(int irq, void *data)
{
	struct da9211 *chip = data;
	int reg_val, err, ret = IRQ_NONE;

	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
	if (err < 0)
		goto error_i2c;

	if (reg_val & DA9211_E_OV_CURR_A) {
		regulator_notifier_call_chain(chip->rdev[0],
			REGULATOR_EVENT_OVER_CURRENT, NULL);

		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
			DA9211_E_OV_CURR_A);
		if (err < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	if (reg_val & DA9211_E_OV_CURR_B) {
		regulator_notifier_call_chain(chip->rdev[1],
			REGULATOR_EVENT_OVER_CURRENT, NULL);

		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
			DA9211_E_OV_CURR_B);
		if (err < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	return ret;

error_i2c:
	dev_err(chip->dev, "I2C error : %d\n", err);
	return IRQ_NONE;
}

static int da9211_regulator_init(struct da9211 *chip)
{
	struct regulator_config config = { };
	int i, ret;
	unsigned int data;

	ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
		return ret;
	}

	data &= DA9211_SLAVE_SEL;
	/* If configuration for 1/2 bucks is different between platform data
	 * and the register, driver should exit.
	 */
	if (chip->pdata->num_buck == 1 && data == 0x00)
		chip->num_regulator = 1;
	else if (chip->pdata->num_buck == 2 && data != 0x00)
		chip->num_regulator = 2;
	else {
		dev_err(chip->dev, "Configuration is mismatched\n");
		return -EINVAL;
	}

	for (i = 0; i < chip->num_regulator; i++) {
		config.init_data = chip->pdata->init_data[i];
		config.dev = chip->dev;
		config.driver_data = chip;
		config.regmap = chip->regmap;
		config.of_node = chip->pdata->reg_node[i];

		if (chip->pdata->gpiod_ren[i])
			config.ena_gpiod = chip->pdata->gpiod_ren[i];
		else
			config.ena_gpiod = NULL;

		/*
		 * Hand the GPIO descriptor management over to the regulator
		 * core, remove it from GPIO devres management.
		 */
		if (config.ena_gpiod)
			devm_gpiod_unhinge(chip->dev, config.ena_gpiod);
		chip->rdev[i] = devm_regulator_register(chip->dev,
			&da9211_regulators[i], &config);
		if (IS_ERR(chip->rdev[i])) {
			dev_err(chip->dev,
				"Failed to register DA9211 regulator\n");
			return PTR_ERR(chip->rdev[i]);
		}

		if (chip->chip_irq != 0) {
			ret = regmap_update_bits(chip->regmap,
				DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
			if (ret < 0) {
				dev_err(chip->dev,
					"Failed to update mask reg: %d\n", ret);
				return ret;
			}
		}
	}

	return 0;
}

/*
 * I2C driver interface functions
 */
static int da9211_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
{
	struct da9211 *chip;
	int error, ret;
	unsigned int data;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->dev = &i2c->dev;
	chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
	if (IS_ERR(chip->regmap)) {
		error = PTR_ERR(chip->regmap);
		dev_err(chip->dev, "Failed to allocate register map: %d\n",
			error);
		return error;
	}

	i2c_set_clientdata(i2c, chip);

	chip->pdata = i2c->dev.platform_data;

	ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
		return ret;
	}

	switch (data) {
	case DA9211_DEVICE_ID:
		chip->chip_id = DA9211;
		break;
	case DA9213_DEVICE_ID:
		chip->chip_id = DA9213;
		break;
	case DA9215_DEVICE_ID:
		chip->chip_id = DA9215;
		break;
	default:
		dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
		return -ENODEV;
	}

	if (!chip->pdata)
		chip->pdata = da9211_parse_regulators_dt(chip->dev);

	if (IS_ERR(chip->pdata)) {
		dev_err(chip->dev, "No regulators defined for the platform\n");
		return PTR_ERR(chip->pdata);
	}

	chip->chip_irq = i2c->irq;

	if (chip->chip_irq != 0) {
		ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
					da9211_irq_handler,
					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
					"da9211", chip);
		if (ret != 0) {
			dev_err(chip->dev, "Failed to request IRQ: %d\n",
				chip->chip_irq);
			return ret;
		}
	} else {
		dev_warn(chip->dev, "No IRQ configured\n");
	}

	ret = da9211_regulator_init(chip);

	if (ret < 0)
		dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);

	return ret;
}

static const struct i2c_device_id da9211_i2c_id[] = {
	{"da9211", DA9211},
	{"da9212", DA9212},
	{"da9213", DA9213},
	{"da9223", DA9223},
	{"da9214", DA9214},
	{"da9224", DA9224},
	{"da9215", DA9215},
	{"da9225", DA9225},
	{},
};
MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);

#ifdef CONFIG_OF
static const struct of_device_id da9211_dt_ids[] = {
	{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
	{ .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
	{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
	{ .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
	{ .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
	{ .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
	{ .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
	{ .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
	{},
};
MODULE_DEVICE_TABLE(of, da9211_dt_ids);
#endif

static struct i2c_driver da9211_regulator_driver = {
	.driver = {
		.name = "da9211",
		.of_match_table = of_match_ptr(da9211_dt_ids),
	},
	.probe = da9211_i2c_probe,
	.id_table = da9211_i2c_id,
};

module_i2c_driver(da9211_regulator_driver);

MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1028a37d	1	/*
7524c1ce	2	* da9211-regulator.c - Regulator device driver for DA9211/DA9212
707ce9ea	3	* /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
7bd39354	4	* Copyright (C) 2015 Dialog Semiconductor Ltd.
1028a37d JB	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Library General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Library General Public License for more details.
	15	*/
	16
	17	#include <linux/err.h>
1028a37d JB	18	#include <linux/i2c.h>
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/slab.h>
	22	#include <linux/regulator/driver.h>
	23	#include <linux/regulator/machine.h>
	24	#include <linux/regmap.h>
	25	#include <linux/irq.h>
	26	#include <linux/interrupt.h>
11da04af	27	#include <linux/gpio/consumer.h>
bf3baca6	28	#include <linux/regulator/of_regulator.h>
1028a37d JB	29	#include <linux/regulator/da9211.h>
	30	#include "da9211-regulator.h"
	31
005547e0 JB	32	/* DEVICE IDs */
	33	#define DA9211_DEVICE_ID 0x22
	34	#define DA9213_DEVICE_ID 0x23
7bd39354	35	#define DA9215_DEVICE_ID 0x24
005547e0	36
1028a37d JB	37	#define DA9211_BUCK_MODE_SLEEP 1
	38	#define DA9211_BUCK_MODE_SYNC 2
	39	#define DA9211_BUCK_MODE_AUTO 3
	40
	41	/* DA9211 REGULATOR IDs */
	42	#define DA9211_ID_BUCKA 0
	43	#define DA9211_ID_BUCKB 1
	44
	45	struct da9211 {
	46	struct device *dev;
	47	struct regmap *regmap;
	48	struct da9211_pdata *pdata;
	49	struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
	50	int num_regulator;
	51	int chip_irq;
005547e0	52	int chip_id;
1028a37d JB	53	};
	54
	55	static const struct regmap_range_cfg da9211_regmap_range[] = {
	56	{
	57	.selector_reg = DA9211_REG_PAGE_CON,
	58	.selector_mask = DA9211_REG_PAGE_MASK,
	59	.selector_shift = DA9211_REG_PAGE_SHIFT,
	60	.window_start = 0,
	61	.window_len = 256,
	62	.range_min = 0,
005547e0	63	.range_max = 5*128,
1028a37d JB	64	},
	65	};
	66
	67	static const struct regmap_config da9211_regmap_config = {
	68	.reg_bits = 8,
	69	.val_bits = 8,
005547e0	70	.max_register = 5 * 128,
1028a37d JB	71	.ranges = da9211_regmap_range,
	72	.num_ranges = ARRAY_SIZE(da9211_regmap_range),
	73	};
	74
	75	/* Default limits measured in millivolts and milliamps */
	76	#define DA9211_MIN_MV 300
	77	#define DA9211_MAX_MV 1570
	78	#define DA9211_STEP_MV 10
	79
005547e0 JB	80	/* Current limits for DA9211 buck (uA) indices
	81	* corresponds with register values
	82	*/
1028a37d JB	83	static const int da9211_current_limits[] = {
	84	2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
	85	3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
	86	};
005547e0 JB	87	/* Current limits for DA9213 buck (uA) indices
	88	* corresponds with register values
	89	*/
	90	static const int da9213_current_limits[] = {
	91	3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
	92	4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
	93	};
7bd39354 JB	94	/* Current limits for DA9215 buck (uA) indices
	95	* corresponds with register values
	96	*/
	97	static const int da9215_current_limits[] = {
	98	4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
	99	5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
	100	};
1028a37d JB	101
	102	static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
	103	{
	104	int id = rdev_get_id(rdev);
	105	struct da9211 *chip = rdev_get_drvdata(rdev);
	106	unsigned int data;
	107	int ret, mode = 0;
	108
	109	ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
	110	if (ret < 0)
	111	return ret;
	112
	113	switch (data & 0x03) {
	114	case DA9211_BUCK_MODE_SYNC:
	115	mode = REGULATOR_MODE_FAST;
	116	break;
	117	case DA9211_BUCK_MODE_AUTO:
	118	mode = REGULATOR_MODE_NORMAL;
	119	break;
	120	case DA9211_BUCK_MODE_SLEEP:
	121	mode = REGULATOR_MODE_STANDBY;
	122	break;
	123	}
	124
	125	return mode;
	126	}
	127
	128	static int da9211_buck_set_mode(struct regulator_dev *rdev,
	129	unsigned int mode)
	130	{
	131	int id = rdev_get_id(rdev);
	132	struct da9211 *chip = rdev_get_drvdata(rdev);
	133	int val = 0;
	134
	135	switch (mode) {
	136	case REGULATOR_MODE_FAST:
	137	val = DA9211_BUCK_MODE_SYNC;
	138	break;
	139	case REGULATOR_MODE_NORMAL:
	140	val = DA9211_BUCK_MODE_AUTO;
	141	break;
	142	case REGULATOR_MODE_STANDBY:
	143	val = DA9211_BUCK_MODE_SLEEP;
	144	break;
	145	}
	146
	147	return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
	148	0x03, val);
	149	}
	150
	151	static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
	152	int max)
	153	{
	154	int id = rdev_get_id(rdev);
	155	struct da9211 *chip = rdev_get_drvdata(rdev);
005547e0 JB	156	int i, max_size;
	157	const int *current_limits;
	158
	159	switch (chip->chip_id) {
	160	case DA9211:
	161	current_limits = da9211_current_limits;
	162	max_size = ARRAY_SIZE(da9211_current_limits)-1;
	163	break;
	164	case DA9213:
	165	current_limits = da9213_current_limits;
	166	max_size = ARRAY_SIZE(da9213_current_limits)-1;
	167	break;
7bd39354 JB	168	case DA9215:
	169	current_limits = da9215_current_limits;
	170	max_size = ARRAY_SIZE(da9215_current_limits)-1;
	171	break;
005547e0 JB	172	default:
	173	return -EINVAL;
	174	}
1028a37d JB	175
1028a37d JB	176	/* search for closest to maximum */
005547e0 JB	177	for (i = max_size; i >= 0; i--) {
	178	if (min <= current_limits[i] &&
	179	max >= current_limits[i]) {
1028a37d JB	180	return regmap_update_bits(chip->regmap,
	181	DA9211_REG_BUCK_ILIM,
	182	(0x0F << id4), (i << id4));
	183	}
	184	}
	185
	186	return -EINVAL;
	187	}
	188
	189	static int da9211_get_current_limit(struct regulator_dev *rdev)
	190	{
	191	int id = rdev_get_id(rdev);
	192	struct da9211 *chip = rdev_get_drvdata(rdev);
	193	unsigned int data;
	194	int ret;
005547e0 JB	195	const int *current_limits;
	196
	197	switch (chip->chip_id) {
	198	case DA9211:
	199	current_limits = da9211_current_limits;
	200	break;
	201	case DA9213:
	202	current_limits = da9213_current_limits;
	203	break;
7bd39354 JB	204	case DA9215:
	205	current_limits = da9215_current_limits;
	206	break;
005547e0 JB	207	default:
	208	return -EINVAL;
	209	}
1028a37d JB	210
	211	ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
	212	if (ret < 0)
	213	return ret;
	214
005547e0 JB	215	/* select one of 16 values: 0000 (2000mA or 3000mA)
	216	* to 1111 (5000mA or 6000mA).
	217	*/
1028a37d	218	data = (data >> id*4) & 0x0F;
005547e0	219	return current_limits[data];
1028a37d JB	220	}
1028a37d JB	221
71242b49	222	static const struct regulator_ops da9211_buck_ops = {
1028a37d JB	223	.get_mode = da9211_buck_get_mode,
	224	.set_mode = da9211_buck_set_mode,
	225	.enable = regulator_enable_regmap,
	226	.disable = regulator_disable_regmap,
	227	.is_enabled = regulator_is_enabled_regmap,
	228	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	229	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	230	.list_voltage = regulator_list_voltage_linear,
	231	.set_current_limit = da9211_set_current_limit,
	232	.get_current_limit = da9211_get_current_limit,
	233	};
	234
	235	#define DA9211_BUCK(_id) \
	236	{\
	237	.name = #_id,\
	238	.ops = &da9211_buck_ops,\
	239	.type = REGULATOR_VOLTAGE,\
	240	.id = DA9211_ID_##_id,\
	241	.n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
	242	.min_uV = (DA9211_MIN_MV * 1000),\
	243	.uV_step = (DA9211_STEP_MV * 1000),\
	244	.enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
	245	.enable_mask = DA9211_BUCKA_EN,\
	246	.vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
	247	.vsel_mask = DA9211_VBUCK_MASK,\
	248	.owner = THIS_MODULE,\
	249	}
	250
	251	static struct regulator_desc da9211_regulators[] = {
	252	DA9211_BUCK(BUCKA),
	253	DA9211_BUCK(BUCKB),
	254	};
	255
bf3baca6 JB	256	#ifdef CONFIG_OF
	257	static struct of_regulator_match da9211_matches[] = {
	258	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
	259	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
	260	};
	261
	262	static struct da9211_pdata *da9211_parse_regulators_dt(
	263	struct device *dev)
	264	{
	265	struct da9211_pdata *pdata;
	266	struct device_node *node;
	267	int i, num, n;
	268
	269	node = of_get_child_by_name(dev->of_node, "regulators");
	270	if (!node) {
	271	dev_err(dev, "regulators node not found\n");
	272	return ERR_PTR(-ENODEV);
	273	}
	274
	275	num = of_regulator_match(dev, node, da9211_matches,
	276	ARRAY_SIZE(da9211_matches));
	277	of_node_put(node);
	278	if (num < 0) {
	279	dev_err(dev, "Failed to match regulators\n");
	280	return ERR_PTR(-EINVAL);
	281	}
	282
	283	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	284	if (!pdata)
	285	return ERR_PTR(-ENOMEM);
	286
	287	pdata->num_buck = num;
	288
	289	n = 0;
	290	for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
	291	if (!da9211_matches[i].init_data)
	292	continue;
	293
	294	pdata->init_data[n] = da9211_matches[i].init_data;
076c3b8e	295	pdata->reg_node[n] = da9211_matches[i].of_node;
11da04af	296	pdata->gpiod_ren[n] = devm_gpiod_get_from_of_node(dev,
63239e4b LW	297	da9211_matches[i].of_node,
	298	"enable",
	299	0,
	300	GPIOD_OUT_HIGH \| GPIOD_FLAGS_BIT_NONEXCLUSIVE,
	301	"da9211-enable");
bf3baca6	302	n++;
c2a946e0	303	}
bf3baca6 JB	304
	305	return pdata;
	306	}
	307	#else
	308	static struct da9211_pdata *da9211_parse_regulators_dt(
	309	struct device *dev)
	310	{
	311	return ERR_PTR(-ENODEV);
	312	}
	313	#endif
	314
1028a37d JB	315	static irqreturn_t da9211_irq_handler(int irq, void *data)
	316	{
	317	struct da9211 *chip = data;
	318	int reg_val, err, ret = IRQ_NONE;
	319
	320	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
	321	if (err < 0)
	322	goto error_i2c;
	323
	324	if (reg_val & DA9211_E_OV_CURR_A) {
	325	regulator_notifier_call_chain(chip->rdev[0],
a46a0730	326	REGULATOR_EVENT_OVER_CURRENT, NULL);
1028a37d JB	327
	328	err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
	329	DA9211_E_OV_CURR_A);
	330	if (err < 0)
	331	goto error_i2c;
	332
	333	ret = IRQ_HANDLED;
	334	}
	335
	336	if (reg_val & DA9211_E_OV_CURR_B) {
	337	regulator_notifier_call_chain(chip->rdev[1],
a46a0730	338	REGULATOR_EVENT_OVER_CURRENT, NULL);
1028a37d JB	339
	340	err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
	341	DA9211_E_OV_CURR_B);
	342	if (err < 0)
	343	goto error_i2c;
	344
	345	ret = IRQ_HANDLED;
	346	}
	347
	348	return ret;
	349
	350	error_i2c:
	351	dev_err(chip->dev, "I2C error : %d\n", err);
	352	return IRQ_NONE;
	353	}
	354
	355	static int da9211_regulator_init(struct da9211 *chip)
	356	{
	357	struct regulator_config config = { };
	358	int i, ret;
	359	unsigned int data;
	360
	361	ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
	362	if (ret < 0) {
767e8aab	363	dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
516c1514	364	return ret;
1028a37d JB	365	}
	366
	367	data &= DA9211_SLAVE_SEL;
	368	/* If configuration for 1/2 bucks is different between platform data
	369	* and the register, driver should exit.
	370	*/
7bd39354 JB	371	if (chip->pdata->num_buck == 1 && data == 0x00)
	372	chip->num_regulator = 1;
	373	else if (chip->pdata->num_buck == 2 && data != 0x00)
	374	chip->num_regulator = 2;
	375	else {
1028a37d	376	dev_err(chip->dev, "Configuration is mismatched\n");
516c1514	377	return -EINVAL;
1028a37d JB	378	}
	379
	380	for (i = 0; i < chip->num_regulator; i++) {
bf3baca6	381	config.init_data = chip->pdata->init_data[i];
1028a37d JB	382	config.dev = chip->dev;
	383	config.driver_data = chip;
	384	config.regmap = chip->regmap;
076c3b8e	385	config.of_node = chip->pdata->reg_node[i];
1028a37d	386
11da04af LW	387	if (chip->pdata->gpiod_ren[i])
	388	config.ena_gpiod = chip->pdata->gpiod_ren[i];
	389	else
	390	config.ena_gpiod = NULL;
8c7dd8bc	391
b23328d7 LW	392	/*
	393	* Hand the GPIO descriptor management over to the regulator
	394	* core, remove it from GPIO devres management.
	395	*/
	396	if (config.ena_gpiod)
	397	devm_gpiod_unhinge(chip->dev, config.ena_gpiod);
1028a37d JB	398	chip->rdev[i] = devm_regulator_register(chip->dev,
	399	&da9211_regulators[i], &config);
	400	if (IS_ERR(chip->rdev[i])) {
	401	dev_err(chip->dev,
	402	"Failed to register DA9211 regulator\n");
516c1514	403	return PTR_ERR(chip->rdev[i]);
1028a37d JB	404	}
	405
	406	if (chip->chip_irq != 0) {
	407	ret = regmap_update_bits(chip->regmap,
4e7089f3	408	DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
1028a37d JB	409	if (ret < 0) {
	410	dev_err(chip->dev,
	411	"Failed to update mask reg: %d\n", ret);
516c1514	412	return ret;
1028a37d JB	413	}
	414	}
	415	}
	416
	417	return 0;
1028a37d	418	}
bf3baca6	419
1028a37d JB	420	/*
	421	* I2C driver interface functions
	422	*/
	423	static int da9211_i2c_probe(struct i2c_client *i2c,
	424	const struct i2c_device_id *id)
	425	{
	426	struct da9211 *chip;
	427	int error, ret;
005547e0	428	unsigned int data;
1028a37d JB	429
1028a37d JB	430	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
1d3e6a69 AL	431	if (!chip)
1d3e6a69 AL	432	return -ENOMEM;
1028a37d JB	433
	434	chip->dev = &i2c->dev;
	435	chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
	436	if (IS_ERR(chip->regmap)) {
	437	error = PTR_ERR(chip->regmap);
005547e0	438	dev_err(chip->dev, "Failed to allocate register map: %d\n",
1028a37d JB	439	error);
	440	return error;
	441	}
	442
	443	i2c_set_clientdata(i2c, chip);
	444
	445	chip->pdata = i2c->dev.platform_data;
005547e0 JB	446
	447	ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
	448	if (ret < 0) {
	449	dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
	450	return ret;
	451	}
	452
	453	switch (data) {
	454	case DA9211_DEVICE_ID:
	455	chip->chip_id = DA9211;
	456	break;
	457	case DA9213_DEVICE_ID:
	458	chip->chip_id = DA9213;
	459	break;
7bd39354 JB	460	case DA9215_DEVICE_ID:
	461	chip->chip_id = DA9215;
	462	break;
005547e0 JB	463	default:
005547e0 JB	464	dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
1028a37d JB	465	return -ENODEV;
	466	}
	467
bf3baca6 JB	468	if (!chip->pdata)
	469	chip->pdata = da9211_parse_regulators_dt(chip->dev);
	470
	471	if (IS_ERR(chip->pdata)) {
	472	dev_err(chip->dev, "No regulators defined for the platform\n");
	473	return PTR_ERR(chip->pdata);
	474	}
	475
1028a37d JB	476	chip->chip_irq = i2c->irq;
	477
	478	if (chip->chip_irq != 0) {
	479	ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
	480	da9211_irq_handler,
	481	IRQF_TRIGGER_LOW\|IRQF_ONESHOT,
	482	"da9211", chip);
	483	if (ret != 0) {
	484	dev_err(chip->dev, "Failed to request IRQ: %d\n",
	485	chip->chip_irq);
	486	return ret;
	487	}
	488	} else {
	489	dev_warn(chip->dev, "No IRQ configured\n");
	490	}
	491
	492	ret = da9211_regulator_init(chip);
	493
	494	if (ret < 0)
005547e0	495	dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
1028a37d JB	496
	497	return ret;
	498	}
	499
1028a37d	500	static const struct i2c_device_id da9211_i2c_id[] = {
6a52f563	501	{"da9211", DA9211},
7524c1ce	502	{"da9212", DA9212},
6a52f563	503	{"da9213", DA9213},
707ce9ea	504	{"da9223", DA9223},
7524c1ce	505	{"da9214", DA9214},
707ce9ea	506	{"da9224", DA9224},
7bd39354	507	{"da9215", DA9215},
707ce9ea	508	{"da9225", DA9225},
1028a37d JB	509	{},
1028a37d JB	510	};
1028a37d JB	511	MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
1028a37d JB	512
6a52f563 AL	513	#ifdef CONFIG_OF
	514	static const struct of_device_id da9211_dt_ids[] = {
	515	{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
7524c1ce JB	516	{ .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
7524c1ce JB	517	{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
707ce9ea JB	518	{ .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
	519	{ .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
	520	{ .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
	521	{ .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
	522	{ .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
6a52f563 AL	523	{},
	524	};
	525	MODULE_DEVICE_TABLE(of, da9211_dt_ids);
	526	#endif
	527
1028a37d JB	528	static struct i2c_driver da9211_regulator_driver = {
	529	.driver = {
	530	.name = "da9211",
6a52f563	531	.of_match_table = of_match_ptr(da9211_dt_ids),
1028a37d JB	532	},
1028a37d JB	533	.probe = da9211_i2c_probe,
1028a37d JB	534	.id_table = da9211_i2c_id,
	535	};
	536
	537	module_i2c_driver(da9211_regulator_driver);
	538
	539	MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
707ce9ea	540	MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
7bd39354	541	MODULE_LICENSE("GPL");