[linux-2.6-block.git] / drivers / regulator / da9210-regulator.c

/*
 * da9210-regulator.c - Regulator device driver for DA9210
 * Copyright (C) 2013  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.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */

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

#include "da9210-regulator.h"

struct da9210 {
	struct regulator_dev *rdev;
	struct regmap *regmap;
};

static const struct regmap_config da9210_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
				    int max_uA);
static int da9210_get_current_limit(struct regulator_dev *rdev);

static const struct regulator_ops da9210_buck_ops = {
	.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 = da9210_set_current_limit,
	.get_current_limit = da9210_get_current_limit,
};

/* Default limits measured in millivolts and milliamps */
#define DA9210_MIN_MV		300
#define DA9210_MAX_MV		1570
#define DA9210_STEP_MV		10

/* Current limits for buck (uA) indices corresponds with register values */
static const int da9210_buck_limits[] = {
	1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
	3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
};

static const struct regulator_desc da9210_reg = {
	.name = "DA9210",
	.id = 0,
	.ops = &da9210_buck_ops,
	.type = REGULATOR_VOLTAGE,
	.n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
	.min_uV = (DA9210_MIN_MV * 1000),
	.uV_step = (DA9210_STEP_MV * 1000),
	.vsel_reg = DA9210_REG_VBUCK_A,
	.vsel_mask = DA9210_VBUCK_MASK,
	.enable_reg = DA9210_REG_BUCK_CONT,
	.enable_mask = DA9210_BUCK_EN,
	.owner = THIS_MODULE,
};

static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
				    int max_uA)
{
	struct da9210 *chip = rdev_get_drvdata(rdev);
	unsigned int sel;
	int i;

	/* search for closest to maximum */
	for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
		if (min_uA <= da9210_buck_limits[i] &&
		    max_uA >= da9210_buck_limits[i]) {
			sel = i;
			sel = sel << DA9210_BUCK_ILIM_SHIFT;
			return regmap_update_bits(chip->regmap,
						  DA9210_REG_BUCK_ILIM,
						  DA9210_BUCK_ILIM_MASK, sel);
		}
	}

	return -EINVAL;
}

static int da9210_get_current_limit(struct regulator_dev *rdev)
{
	struct da9210 *chip = rdev_get_drvdata(rdev);
	unsigned int data;
	unsigned int sel;
	int ret;

	ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
	if (ret < 0)
		return ret;

	/* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
	sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;

	return da9210_buck_limits[sel];
}

static irqreturn_t da9210_irq_handler(int irq, void *data)
{
	struct da9210 *chip = data;
	unsigned int val, handled = 0;
	int error, ret = IRQ_NONE;

	error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
	if (error < 0)
		goto error_i2c;

	mutex_lock(&chip->rdev->mutex);

	if (val & DA9210_E_OVCURR) {
		regulator_notifier_call_chain(chip->rdev,
					      REGULATOR_EVENT_OVER_CURRENT,
					      NULL);
		handled |= DA9210_E_OVCURR;
	}
	if (val & DA9210_E_NPWRGOOD) {
		regulator_notifier_call_chain(chip->rdev,
					      REGULATOR_EVENT_UNDER_VOLTAGE,
					      NULL);
		handled |= DA9210_E_NPWRGOOD;
	}
	if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
		regulator_notifier_call_chain(chip->rdev,
					      REGULATOR_EVENT_OVER_TEMP, NULL);
		handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
	}
	if (val & DA9210_E_VMAX) {
		regulator_notifier_call_chain(chip->rdev,
					      REGULATOR_EVENT_REGULATION_OUT,
					      NULL);
		handled |= DA9210_E_VMAX;
	}

	mutex_unlock(&chip->rdev->mutex);

	if (handled) {
		/* Clear handled events */
		error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
		if (error < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	return ret;

error_i2c:
	dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
	return ret;
}

/*
 * I2C driver interface functions
 */
static int da9210_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct da9210 *chip;
	struct device *dev = &i2c->dev;
	struct da9210_pdata *pdata = dev_get_platdata(dev);
	struct regulator_dev *rdev = NULL;
	struct regulator_config config = { };
	int error;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
	if (IS_ERR(chip->regmap)) {
		error = PTR_ERR(chip->regmap);
		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
			error);
		return error;
	}

	config.dev = &i2c->dev;
	config.init_data = pdata ? &pdata->da9210_constraints :
		of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
	config.driver_data = chip;
	config.regmap = chip->regmap;
	config.of_node = dev->of_node;

	/* Mask all interrupt sources to deassert interrupt line */
	error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
	if (!error)
		error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
	if (error) {
		dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
		return error;
	}

	rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
	if (IS_ERR(rdev)) {
		dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
		return PTR_ERR(rdev);
	}

	chip->rdev = rdev;
	if (i2c->irq) {
		error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
						  da9210_irq_handler,
						  IRQF_TRIGGER_LOW |
						  IRQF_ONESHOT | IRQF_SHARED,
						  "da9210", chip);
		if (error) {
			dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
				i2c->irq, error);
			return error;
		}

		error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
					 DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
					 DA9210_M_TEMP_WARN |
					 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
		if (error < 0) {
			dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
				error);
			return error;
		}
	} else {
		dev_warn(&i2c->dev, "No IRQ configured\n");
	}

	i2c_set_clientdata(i2c, chip);

	return 0;
}

static const struct i2c_device_id da9210_i2c_id[] = {
	{"da9210", 0},
	{},
};

MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);

static struct i2c_driver da9210_regulator_driver = {
	.driver = {
		.name = "da9210",
	},
	.probe = da9210_i2c_probe,
	.id_table = da9210_i2c_id,
};

module_i2c_driver(da9210_regulator_driver);

MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
16f10918 ST	1	/*
	2	* da9210-regulator.c - Regulator device driver for DA9210
	3	* Copyright (C) 2013 Dialog Semiconductor Ltd.
	4	*
	5	* This library is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU Library General Public
	7	* License as published by the Free Software Foundation; either
	8	* version 2 of the License, or (at your option) any later version.
	9	*
	10	* This library is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* Library General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU Library General Public
	16	* License along with this library; if not, write to the
	17	* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
	18	* Boston, MA 02110-1301, USA.
	19	*/
	20
	21	#include <linux/err.h>
	22	#include <linux/i2c.h>
	23	#include <linux/module.h>
	24	#include <linux/init.h>
42457460 GU	25	#include <linux/interrupt.h>
42457460 GU	26	#include <linux/irq.h>
16f10918 ST	27	#include <linux/slab.h>
	28	#include <linux/regulator/driver.h>
	29	#include <linux/regulator/machine.h>
937433c2	30	#include <linux/regulator/of_regulator.h>
16f10918 ST	31	#include <linux/regmap.h>
	32
	33	#include "da9210-regulator.h"
	34
	35	struct da9210 {
	36	struct regulator_dev *rdev;
	37	struct regmap *regmap;
	38	};
	39
	40	static const struct regmap_config da9210_regmap_config = {
	41	.reg_bits = 8,
	42	.val_bits = 8,
	43	};
	44
	45	static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
	46	int max_uA);
	47	static int da9210_get_current_limit(struct regulator_dev *rdev);
	48
71242b49	49	static const struct regulator_ops da9210_buck_ops = {
16f10918 ST	50	.enable = regulator_enable_regmap,
	51	.disable = regulator_disable_regmap,
	52	.is_enabled = regulator_is_enabled_regmap,
	53	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	54	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	55	.list_voltage = regulator_list_voltage_linear,
	56	.set_current_limit = da9210_set_current_limit,
	57	.get_current_limit = da9210_get_current_limit,
	58	};
	59
	60	/* Default limits measured in millivolts and milliamps */
	61	#define DA9210_MIN_MV 300
	62	#define DA9210_MAX_MV 1570
	63	#define DA9210_STEP_MV 10
	64
	65	/* Current limits for buck (uA) indices corresponds with register values */
	66	static const int da9210_buck_limits[] = {
	67	1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
	68	3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
	69	};
	70
	71	static const struct regulator_desc da9210_reg = {
	72	.name = "DA9210",
	73	.id = 0,
	74	.ops = &da9210_buck_ops,
	75	.type = REGULATOR_VOLTAGE,
	76	.n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
	77	.min_uV = (DA9210_MIN_MV * 1000),
	78	.uV_step = (DA9210_STEP_MV * 1000),
	79	.vsel_reg = DA9210_REG_VBUCK_A,
	80	.vsel_mask = DA9210_VBUCK_MASK,
	81	.enable_reg = DA9210_REG_BUCK_CONT,
	82	.enable_mask = DA9210_BUCK_EN,
	83	.owner = THIS_MODULE,
	84	};
	85
	86	static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
	87	int max_uA)
	88	{
	89	struct da9210 *chip = rdev_get_drvdata(rdev);
	90	unsigned int sel;
	91	int i;
	92
	93	/* search for closest to maximum */
	94	for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
	95	if (min_uA <= da9210_buck_limits[i] &&
	96	max_uA >= da9210_buck_limits[i]) {
	97	sel = i;
	98	sel = sel << DA9210_BUCK_ILIM_SHIFT;
	99	return regmap_update_bits(chip->regmap,
	100	DA9210_REG_BUCK_ILIM,
	101	DA9210_BUCK_ILIM_MASK, sel);
	102	}
	103	}
	104
	105	return -EINVAL;
	106	}
	107
	108	static int da9210_get_current_limit(struct regulator_dev *rdev)
	109	{
	110	struct da9210 *chip = rdev_get_drvdata(rdev);
	111	unsigned int data;
	112	unsigned int sel;
	113	int ret;
114
115	ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
116	if (ret < 0)
117	return ret;
118
119	/* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
120	sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
121
122	return da9210_buck_limits[sel];
123	}
124
42457460 GU	125	static irqreturn_t da9210_irq_handler(int irq, void *data)
	126	{
	127	struct da9210 *chip = data;
	128	unsigned int val, handled = 0;
	129	int error, ret = IRQ_NONE;
	130
	131	error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
	132	if (error < 0)
	133	goto error_i2c;
	134
0f48eeda WS	135	mutex_lock(&chip->rdev->mutex);
0f48eeda WS	136
42457460 GU	137	if (val & DA9210_E_OVCURR) {
	138	regulator_notifier_call_chain(chip->rdev,
	139	REGULATOR_EVENT_OVER_CURRENT,
	140	NULL);
	141	handled \|= DA9210_E_OVCURR;
	142	}
	143	if (val & DA9210_E_NPWRGOOD) {
	144	regulator_notifier_call_chain(chip->rdev,
	145	REGULATOR_EVENT_UNDER_VOLTAGE,
	146	NULL);
	147	handled \|= DA9210_E_NPWRGOOD;
	148	}
	149	if (val & (DA9210_E_TEMP_WARN \| DA9210_E_TEMP_CRIT)) {
	150	regulator_notifier_call_chain(chip->rdev,
	151	REGULATOR_EVENT_OVER_TEMP, NULL);
	152	handled \|= val & (DA9210_E_TEMP_WARN \| DA9210_E_TEMP_CRIT);
	153	}
	154	if (val & DA9210_E_VMAX) {
	155	regulator_notifier_call_chain(chip->rdev,
	156	REGULATOR_EVENT_REGULATION_OUT,
	157	NULL);
	158	handled \|= DA9210_E_VMAX;
	159	}
0f48eeda WS	160
	161	mutex_unlock(&chip->rdev->mutex);
	162
42457460 GU	163	if (handled) {
	164	/* Clear handled events */
	165	error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
	166	if (error < 0)
	167	goto error_i2c;
	168
	169	ret = IRQ_HANDLED;
	170	}
	171
	172	return ret;
	173
	174	error_i2c:
	175	dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
	176	return ret;
	177	}
	178
16f10918 ST	179	/*
	180	* I2C driver interface functions
	181	*/
	182	static int da9210_i2c_probe(struct i2c_client *i2c,
	183	const struct i2c_device_id *id)
	184	{
	185	struct da9210 *chip;
937433c2 GL	186	struct device *dev = &i2c->dev;
937433c2 GL	187	struct da9210_pdata *pdata = dev_get_platdata(dev);
16f10918 ST	188	struct regulator_dev *rdev = NULL;
	189	struct regulator_config config = { };
	190	int error;
	191
	192	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
6c48acfb	193	if (!chip)
16f10918	194	return -ENOMEM;
16f10918 ST	195
	196	chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
	197	if (IS_ERR(chip->regmap)) {
	198	error = PTR_ERR(chip->regmap);
	199	dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
	200	error);
	201	return error;
	202	}
	203
	204	config.dev = &i2c->dev;
937433c2	205	config.init_data = pdata ? &pdata->da9210_constraints :
072e78b1	206	of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
16f10918 ST	207	config.driver_data = chip;
16f10918 ST	208	config.regmap = chip->regmap;
937433c2	209	config.of_node = dev->of_node;
16f10918	210
4d9cbff5 GU	211	/* Mask all interrupt sources to deassert interrupt line */
	212	error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
	213	if (!error)
	214	error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
	215	if (error) {
	216	dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
	217	return error;
	218	}
	219
11c0da7b	220	rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
16f10918 ST	221	if (IS_ERR(rdev)) {
	222	dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
	223	return PTR_ERR(rdev);
	224	}
	225
	226	chip->rdev = rdev;
42457460 GU	227	if (i2c->irq) {
	228	error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
	229	da9210_irq_handler,
	230	IRQF_TRIGGER_LOW \|
	231	IRQF_ONESHOT \| IRQF_SHARED,
	232	"da9210", chip);
	233	if (error) {
	234	dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
	235	i2c->irq, error);
	236	return error;
	237	}
	238
	239	error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
	240	DA9210_M_OVCURR \| DA9210_M_NPWRGOOD \|
	241	DA9210_M_TEMP_WARN \|
	242	DA9210_M_TEMP_CRIT \| DA9210_M_VMAX, 0);
	243	if (error < 0) {
	244	dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
	245	error);
	246	return error;
	247	}
	248	} else {
	249	dev_warn(&i2c->dev, "No IRQ configured\n");
	250	}
16f10918 ST	251
	252	i2c_set_clientdata(i2c, chip);
	253
	254	return 0;
	255	}
	256
16f10918 ST	257	static const struct i2c_device_id da9210_i2c_id[] = {
	258	{"da9210", 0},
	259	{},
	260	};
	261
	262	MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
	263
	264	static struct i2c_driver da9210_regulator_driver = {
	265	.driver = {
	266	.name = "da9210",
16f10918 ST	267	},
16f10918 ST	268	.probe = da9210_i2c_probe,
16f10918 ST	269	.id_table = da9210_i2c_id,
	270	};
	271
	272	module_i2c_driver(da9210_regulator_driver);
	273
	274	MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
	275	MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
	276	MODULE_LICENSE("GPL v2");