--- /dev/null
+/*
+ * 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/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 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];
+}
+
+/*
+ * 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;
+
+ 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",
+ .owner = THIS_MODULE,
+ },
+ .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");
Code Review / kvmfornfv.git / blobdiff