116f10918SSteve Twiss /* 216f10918SSteve Twiss * da9210-regulator.c - Regulator device driver for DA9210 316f10918SSteve Twiss * Copyright (C) 2013 Dialog Semiconductor Ltd. 416f10918SSteve Twiss * 516f10918SSteve Twiss * This library is free software; you can redistribute it and/or 616f10918SSteve Twiss * modify it under the terms of the GNU Library General Public 716f10918SSteve Twiss * License as published by the Free Software Foundation; either 816f10918SSteve Twiss * version 2 of the License, or (at your option) any later version. 916f10918SSteve Twiss * 1016f10918SSteve Twiss * This library is distributed in the hope that it will be useful, 1116f10918SSteve Twiss * but WITHOUT ANY WARRANTY; without even the implied warranty of 1216f10918SSteve Twiss * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1316f10918SSteve Twiss * Library General Public License for more details. 1416f10918SSteve Twiss * 1516f10918SSteve Twiss * You should have received a copy of the GNU Library General Public 1616f10918SSteve Twiss * License along with this library; if not, write to the 1716f10918SSteve Twiss * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 1816f10918SSteve Twiss * Boston, MA 02110-1301, USA. 1916f10918SSteve Twiss */ 2016f10918SSteve Twiss 2116f10918SSteve Twiss #include <linux/err.h> 2216f10918SSteve Twiss #include <linux/i2c.h> 2316f10918SSteve Twiss #include <linux/module.h> 2416f10918SSteve Twiss #include <linux/init.h> 2516f10918SSteve Twiss #include <linux/slab.h> 2616f10918SSteve Twiss #include <linux/regulator/driver.h> 2716f10918SSteve Twiss #include <linux/regulator/machine.h> 28937433c2SGuennadi Liakhovetski #include <linux/regulator/of_regulator.h> 2916f10918SSteve Twiss #include <linux/regmap.h> 3016f10918SSteve Twiss 3116f10918SSteve Twiss #include "da9210-regulator.h" 3216f10918SSteve Twiss 3316f10918SSteve Twiss struct da9210 { 3416f10918SSteve Twiss struct regulator_dev *rdev; 3516f10918SSteve Twiss struct regmap *regmap; 3616f10918SSteve Twiss }; 3716f10918SSteve Twiss 3816f10918SSteve Twiss static const struct regmap_config da9210_regmap_config = { 3916f10918SSteve Twiss .reg_bits = 8, 4016f10918SSteve Twiss .val_bits = 8, 4116f10918SSteve Twiss }; 4216f10918SSteve Twiss 4316f10918SSteve Twiss static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, 4416f10918SSteve Twiss int max_uA); 4516f10918SSteve Twiss static int da9210_get_current_limit(struct regulator_dev *rdev); 4616f10918SSteve Twiss 4716f10918SSteve Twiss static struct regulator_ops da9210_buck_ops = { 4816f10918SSteve Twiss .enable = regulator_enable_regmap, 4916f10918SSteve Twiss .disable = regulator_disable_regmap, 5016f10918SSteve Twiss .is_enabled = regulator_is_enabled_regmap, 5116f10918SSteve Twiss .set_voltage_sel = regulator_set_voltage_sel_regmap, 5216f10918SSteve Twiss .get_voltage_sel = regulator_get_voltage_sel_regmap, 5316f10918SSteve Twiss .list_voltage = regulator_list_voltage_linear, 5416f10918SSteve Twiss .set_current_limit = da9210_set_current_limit, 5516f10918SSteve Twiss .get_current_limit = da9210_get_current_limit, 5616f10918SSteve Twiss }; 5716f10918SSteve Twiss 5816f10918SSteve Twiss /* Default limits measured in millivolts and milliamps */ 5916f10918SSteve Twiss #define DA9210_MIN_MV 300 6016f10918SSteve Twiss #define DA9210_MAX_MV 1570 6116f10918SSteve Twiss #define DA9210_STEP_MV 10 6216f10918SSteve Twiss 6316f10918SSteve Twiss /* Current limits for buck (uA) indices corresponds with register values */ 6416f10918SSteve Twiss static const int da9210_buck_limits[] = { 6516f10918SSteve Twiss 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 6616f10918SSteve Twiss 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 6716f10918SSteve Twiss }; 6816f10918SSteve Twiss 6916f10918SSteve Twiss static const struct regulator_desc da9210_reg = { 7016f10918SSteve Twiss .name = "DA9210", 7116f10918SSteve Twiss .id = 0, 7216f10918SSteve Twiss .ops = &da9210_buck_ops, 7316f10918SSteve Twiss .type = REGULATOR_VOLTAGE, 7416f10918SSteve Twiss .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, 7516f10918SSteve Twiss .min_uV = (DA9210_MIN_MV * 1000), 7616f10918SSteve Twiss .uV_step = (DA9210_STEP_MV * 1000), 7716f10918SSteve Twiss .vsel_reg = DA9210_REG_VBUCK_A, 7816f10918SSteve Twiss .vsel_mask = DA9210_VBUCK_MASK, 7916f10918SSteve Twiss .enable_reg = DA9210_REG_BUCK_CONT, 8016f10918SSteve Twiss .enable_mask = DA9210_BUCK_EN, 8116f10918SSteve Twiss .owner = THIS_MODULE, 8216f10918SSteve Twiss }; 8316f10918SSteve Twiss 8416f10918SSteve Twiss static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, 8516f10918SSteve Twiss int max_uA) 8616f10918SSteve Twiss { 8716f10918SSteve Twiss struct da9210 *chip = rdev_get_drvdata(rdev); 8816f10918SSteve Twiss unsigned int sel; 8916f10918SSteve Twiss int i; 9016f10918SSteve Twiss 9116f10918SSteve Twiss /* search for closest to maximum */ 9216f10918SSteve Twiss for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) { 9316f10918SSteve Twiss if (min_uA <= da9210_buck_limits[i] && 9416f10918SSteve Twiss max_uA >= da9210_buck_limits[i]) { 9516f10918SSteve Twiss sel = i; 9616f10918SSteve Twiss sel = sel << DA9210_BUCK_ILIM_SHIFT; 9716f10918SSteve Twiss return regmap_update_bits(chip->regmap, 9816f10918SSteve Twiss DA9210_REG_BUCK_ILIM, 9916f10918SSteve Twiss DA9210_BUCK_ILIM_MASK, sel); 10016f10918SSteve Twiss } 10116f10918SSteve Twiss } 10216f10918SSteve Twiss 10316f10918SSteve Twiss return -EINVAL; 10416f10918SSteve Twiss } 10516f10918SSteve Twiss 10616f10918SSteve Twiss static int da9210_get_current_limit(struct regulator_dev *rdev) 10716f10918SSteve Twiss { 10816f10918SSteve Twiss struct da9210 *chip = rdev_get_drvdata(rdev); 10916f10918SSteve Twiss unsigned int data; 11016f10918SSteve Twiss unsigned int sel; 11116f10918SSteve Twiss int ret; 11216f10918SSteve Twiss 11316f10918SSteve Twiss ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data); 11416f10918SSteve Twiss if (ret < 0) 11516f10918SSteve Twiss return ret; 11616f10918SSteve Twiss 11716f10918SSteve Twiss /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */ 11816f10918SSteve Twiss sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT; 11916f10918SSteve Twiss 12016f10918SSteve Twiss return da9210_buck_limits[sel]; 12116f10918SSteve Twiss } 12216f10918SSteve Twiss 12316f10918SSteve Twiss /* 12416f10918SSteve Twiss * I2C driver interface functions 12516f10918SSteve Twiss */ 12616f10918SSteve Twiss static int da9210_i2c_probe(struct i2c_client *i2c, 12716f10918SSteve Twiss const struct i2c_device_id *id) 12816f10918SSteve Twiss { 12916f10918SSteve Twiss struct da9210 *chip; 130937433c2SGuennadi Liakhovetski struct device *dev = &i2c->dev; 131937433c2SGuennadi Liakhovetski struct da9210_pdata *pdata = dev_get_platdata(dev); 13216f10918SSteve Twiss struct regulator_dev *rdev = NULL; 13316f10918SSteve Twiss struct regulator_config config = { }; 13416f10918SSteve Twiss int error; 13516f10918SSteve Twiss 13616f10918SSteve Twiss chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL); 13716f10918SSteve Twiss if (NULL == chip) { 13816f10918SSteve Twiss dev_err(&i2c->dev, 13916f10918SSteve Twiss "Cannot kzalloc memory for regulator structure\n"); 14016f10918SSteve Twiss return -ENOMEM; 14116f10918SSteve Twiss } 14216f10918SSteve Twiss 14316f10918SSteve Twiss chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); 14416f10918SSteve Twiss if (IS_ERR(chip->regmap)) { 14516f10918SSteve Twiss error = PTR_ERR(chip->regmap); 14616f10918SSteve Twiss dev_err(&i2c->dev, "Failed to allocate register map: %d\n", 14716f10918SSteve Twiss error); 14816f10918SSteve Twiss return error; 14916f10918SSteve Twiss } 15016f10918SSteve Twiss 15116f10918SSteve Twiss config.dev = &i2c->dev; 152937433c2SGuennadi Liakhovetski config.init_data = pdata ? &pdata->da9210_constraints : 153937433c2SGuennadi Liakhovetski of_get_regulator_init_data(dev, dev->of_node); 15416f10918SSteve Twiss config.driver_data = chip; 15516f10918SSteve Twiss config.regmap = chip->regmap; 156937433c2SGuennadi Liakhovetski config.of_node = dev->of_node; 15716f10918SSteve Twiss 15811c0da7bSJingoo Han rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config); 15916f10918SSteve Twiss if (IS_ERR(rdev)) { 16016f10918SSteve Twiss dev_err(&i2c->dev, "Failed to register DA9210 regulator\n"); 16116f10918SSteve Twiss return PTR_ERR(rdev); 16216f10918SSteve Twiss } 16316f10918SSteve Twiss 16416f10918SSteve Twiss chip->rdev = rdev; 16516f10918SSteve Twiss 16616f10918SSteve Twiss i2c_set_clientdata(i2c, chip); 16716f10918SSteve Twiss 16816f10918SSteve Twiss return 0; 16916f10918SSteve Twiss } 17016f10918SSteve Twiss 17116f10918SSteve Twiss static const struct i2c_device_id da9210_i2c_id[] = { 17216f10918SSteve Twiss {"da9210", 0}, 17316f10918SSteve Twiss {}, 17416f10918SSteve Twiss }; 17516f10918SSteve Twiss 17616f10918SSteve Twiss MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); 17716f10918SSteve Twiss 17816f10918SSteve Twiss static struct i2c_driver da9210_regulator_driver = { 17916f10918SSteve Twiss .driver = { 18016f10918SSteve Twiss .name = "da9210", 18116f10918SSteve Twiss .owner = THIS_MODULE, 18216f10918SSteve Twiss }, 18316f10918SSteve Twiss .probe = da9210_i2c_probe, 18416f10918SSteve Twiss .id_table = da9210_i2c_id, 18516f10918SSteve Twiss }; 18616f10918SSteve Twiss 18716f10918SSteve Twiss module_i2c_driver(da9210_regulator_driver); 18816f10918SSteve Twiss 18916f10918SSteve Twiss MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); 19016f10918SSteve Twiss MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210"); 19116f10918SSteve Twiss MODULE_LICENSE("GPL v2"); 192