/* * 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); config.driver_data = chip; config.regmap = chip->regmap; config.of_node = dev->of_node; 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");