189 lines
5.2 KiB
C
189 lines
5.2 KiB
C
/*
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* da9210-regulator.c - Regulator device driver for DA9210
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* Copyright (C) 2013 Dialog Semiconductor Ltd.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regmap.h>
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#include "da9210-regulator.h"
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struct da9210 {
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struct regulator_dev *rdev;
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struct regmap *regmap;
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};
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static const struct regmap_config da9210_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
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int max_uA);
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static int da9210_get_current_limit(struct regulator_dev *rdev);
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static struct regulator_ops da9210_buck_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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.set_current_limit = da9210_set_current_limit,
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.get_current_limit = da9210_get_current_limit,
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};
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/* Default limits measured in millivolts and milliamps */
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#define DA9210_MIN_MV 300
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#define DA9210_MAX_MV 1570
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#define DA9210_STEP_MV 10
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/* Current limits for buck (uA) indices corresponds with register values */
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static const int da9210_buck_limits[] = {
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1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
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3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
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};
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static const struct regulator_desc da9210_reg = {
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.name = "DA9210",
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.id = 0,
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.ops = &da9210_buck_ops,
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.type = REGULATOR_VOLTAGE,
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.n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
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.min_uV = (DA9210_MIN_MV * 1000),
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.uV_step = (DA9210_STEP_MV * 1000),
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.vsel_reg = DA9210_REG_VBUCK_A,
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.vsel_mask = DA9210_VBUCK_MASK,
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.enable_reg = DA9210_REG_BUCK_CONT,
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.enable_mask = DA9210_BUCK_EN,
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.owner = THIS_MODULE,
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};
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static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
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int max_uA)
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{
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struct da9210 *chip = rdev_get_drvdata(rdev);
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unsigned int sel;
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int i;
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/* search for closest to maximum */
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for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
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if (min_uA <= da9210_buck_limits[i] &&
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max_uA >= da9210_buck_limits[i]) {
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sel = i;
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sel = sel << DA9210_BUCK_ILIM_SHIFT;
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return regmap_update_bits(chip->regmap,
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DA9210_REG_BUCK_ILIM,
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DA9210_BUCK_ILIM_MASK, sel);
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}
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}
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return -EINVAL;
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}
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static int da9210_get_current_limit(struct regulator_dev *rdev)
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{
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struct da9210 *chip = rdev_get_drvdata(rdev);
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unsigned int data;
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unsigned int sel;
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int ret;
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ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
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if (ret < 0)
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return ret;
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/* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
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sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
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return da9210_buck_limits[sel];
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}
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/*
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* I2C driver interface functions
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*/
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static int da9210_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct da9210 *chip;
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struct device *dev = &i2c->dev;
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struct da9210_pdata *pdata = dev_get_platdata(dev);
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struct regulator_dev *rdev = NULL;
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struct regulator_config config = { };
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int error;
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chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
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if (IS_ERR(chip->regmap)) {
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error = PTR_ERR(chip->regmap);
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dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
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error);
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return error;
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}
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config.dev = &i2c->dev;
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config.init_data = pdata ? &pdata->da9210_constraints :
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of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
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config.driver_data = chip;
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config.regmap = chip->regmap;
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config.of_node = dev->of_node;
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rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
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if (IS_ERR(rdev)) {
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dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
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return PTR_ERR(rdev);
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}
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chip->rdev = rdev;
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i2c_set_clientdata(i2c, chip);
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return 0;
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}
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static const struct i2c_device_id da9210_i2c_id[] = {
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{"da9210", 0},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
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static struct i2c_driver da9210_regulator_driver = {
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.driver = {
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.name = "da9210",
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.owner = THIS_MODULE,
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},
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.probe = da9210_i2c_probe,
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.id_table = da9210_i2c_id,
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};
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module_i2c_driver(da9210_regulator_driver);
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MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
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MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
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MODULE_LICENSE("GPL v2");
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