drivers/regulator/da9210-regulator.c - linux - Git at Google

 /*
  * 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;

 	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;
 	}
 	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");
	/*
	* 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;

	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;
	}
	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");