drivers/regulator/da9210-regulator.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 //
0003 // da9210-regulator.c - Regulator device driver for DA9210
0004 // Copyright (C) 2013  Dialog Semiconductor Ltd.
0005
0006 #include <linux/err.h>
0007 #include <linux/i2c.h>
0008 #include <linux/module.h>
0009 #include <linux/interrupt.h>
0010 #include <linux/irq.h>
0011 #include <linux/regulator/driver.h>
0012 #include <linux/regulator/machine.h>
0013 #include <linux/of_device.h>
0014 #include <linux/regulator/of_regulator.h>
0015 #include <linux/regmap.h>
0016
0017 #include "da9210-regulator.h"
0018
0019 struct da9210 {
0020     struct regulator_dev *rdev;
0021     struct regmap *regmap;
0022 };
0023
0024 static const struct regmap_config da9210_regmap_config = {
0025     .reg_bits = 8,
0026     .val_bits = 8,
0027 };
0028
0029 static const struct regulator_ops da9210_buck_ops = {
0030     .enable = regulator_enable_regmap,
0031     .disable = regulator_disable_regmap,
0032     .is_enabled = regulator_is_enabled_regmap,
0033     .set_voltage_sel = regulator_set_voltage_sel_regmap,
0034     .get_voltage_sel = regulator_get_voltage_sel_regmap,
0035     .list_voltage = regulator_list_voltage_linear,
0036     .set_current_limit = regulator_set_current_limit_regmap,
0037     .get_current_limit = regulator_get_current_limit_regmap,
0038 };
0039
0040 /* Default limits measured in millivolts and milliamps */
0041 #define DA9210_MIN_MV       300
0042 #define DA9210_MAX_MV       1570
0043 #define DA9210_STEP_MV      10
0044
0045 /* Current limits for buck (uA) indices corresponds with register values */
0046 static const unsigned int da9210_buck_limits[] = {
0047     1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
0048     3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
0049 };
0050
0051 static const struct regulator_desc da9210_reg = {
0052     .name = "DA9210",
0053     .id = 0,
0054     .ops = &da9210_buck_ops,
0055     .type = REGULATOR_VOLTAGE,
0056     .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
0057     .min_uV = (DA9210_MIN_MV * 1000),
0058     .uV_step = (DA9210_STEP_MV * 1000),
0059     .vsel_reg = DA9210_REG_VBUCK_A,
0060     .vsel_mask = DA9210_VBUCK_MASK,
0061     .enable_reg = DA9210_REG_BUCK_CONT,
0062     .enable_mask = DA9210_BUCK_EN,
0063     .owner = THIS_MODULE,
0064     .curr_table = da9210_buck_limits,
0065     .n_current_limits = ARRAY_SIZE(da9210_buck_limits),
0066     .csel_reg = DA9210_REG_BUCK_ILIM,
0067     .csel_mask = DA9210_BUCK_ILIM_MASK,
0068 };
0069
0070 static irqreturn_t da9210_irq_handler(int irq, void *data)
0071 {
0072     struct da9210 *chip = data;
0073     unsigned int val, handled = 0;
0074     int error, ret = IRQ_NONE;
0075
0076     error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
0077     if (error < 0)
0078         goto error_i2c;
0079
0080     if (val & DA9210_E_OVCURR) {
0081         regulator_notifier_call_chain(chip->rdev,
0082                           REGULATOR_EVENT_OVER_CURRENT,
0083                           NULL);
0084         handled |= DA9210_E_OVCURR;
0085     }
0086     if (val & DA9210_E_NPWRGOOD) {
0087         regulator_notifier_call_chain(chip->rdev,
0088                           REGULATOR_EVENT_UNDER_VOLTAGE,
0089                           NULL);
0090         handled |= DA9210_E_NPWRGOOD;
0091     }
0092     if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
0093         regulator_notifier_call_chain(chip->rdev,
0094                           REGULATOR_EVENT_OVER_TEMP, NULL);
0095         handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
0096     }
0097     if (val & DA9210_E_VMAX) {
0098         regulator_notifier_call_chain(chip->rdev,
0099                           REGULATOR_EVENT_REGULATION_OUT,
0100                           NULL);
0101         handled |= DA9210_E_VMAX;
0102     }
0103
0104     if (handled) {
0105         /* Clear handled events */
0106         error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
0107         if (error < 0)
0108             goto error_i2c;
0109
0110         ret = IRQ_HANDLED;
0111     }
0112
0113     return ret;
0114
0115 error_i2c:
0116     dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
0117     return ret;
0118 }
0119
0120 /*
0121  * I2C driver interface functions
0122  */
0123
0124 static const struct of_device_id __maybe_unused da9210_dt_ids[] = {
0125     { .compatible = "dlg,da9210", },
0126     { }
0127 };
0128 MODULE_DEVICE_TABLE(of, da9210_dt_ids);
0129
0130 static int da9210_i2c_probe(struct i2c_client *i2c)
0131 {
0132     struct da9210 *chip;
0133     struct device *dev = &i2c->dev;
0134     struct da9210_pdata *pdata = dev_get_platdata(dev);
0135     struct regulator_dev *rdev = NULL;
0136     struct regulator_config config = { };
0137     int error;
0138     const struct of_device_id *match;
0139
0140     if (i2c->dev.of_node && !pdata) {
0141         match = of_match_device(of_match_ptr(da9210_dt_ids),
0142                         &i2c->dev);
0143         if (!match) {
0144             dev_err(&i2c->dev, "Error: No device match found\n");
0145             return -ENODEV;
0146         }
0147     }
0148
0149     chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
0150     if (!chip)
0151         return -ENOMEM;
0152
0153     chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
0154     if (IS_ERR(chip->regmap)) {
0155         error = PTR_ERR(chip->regmap);
0156         dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
0157             error);
0158         return error;
0159     }
0160
0161     config.dev = &i2c->dev;
0162     config.init_data = pdata ? &pdata->da9210_constraints :
0163         of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
0164     config.driver_data = chip;
0165     config.regmap = chip->regmap;
0166     config.of_node = dev->of_node;
0167
0168     /* Mask all interrupt sources to deassert interrupt line */
0169     error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
0170     if (!error)
0171         error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
0172     if (error) {
0173         dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
0174         return error;
0175     }
0176
0177     rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
0178     if (IS_ERR(rdev)) {
0179         dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
0180         return PTR_ERR(rdev);
0181     }
0182
0183     chip->rdev = rdev;
0184     if (i2c->irq) {
0185         error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
0186                           da9210_irq_handler,
0187                           IRQF_TRIGGER_LOW |
0188                           IRQF_ONESHOT | IRQF_SHARED,
0189                           "da9210", chip);
0190         if (error) {
0191             dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
0192                 i2c->irq, error);
0193             return error;
0194         }
0195
0196         error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
0197                      DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
0198                      DA9210_M_TEMP_WARN |
0199                      DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
0200         if (error < 0) {
0201             dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
0202                 error);
0203             return error;
0204         }
0205     } else {
0206         dev_warn(&i2c->dev, "No IRQ configured\n");
0207     }
0208
0209     i2c_set_clientdata(i2c, chip);
0210
0211     return 0;
0212 }
0213
0214 static const struct i2c_device_id da9210_i2c_id[] = {
0215     {"da9210", 0},
0216     {},
0217 };
0218
0219 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
0220
0221 static struct i2c_driver da9210_regulator_driver = {
0222     .driver = {
0223         .name = "da9210",
0224         .of_match_table = of_match_ptr(da9210_dt_ids),
0225     },
0226     .probe_new = da9210_i2c_probe,
0227     .id_table = da9210_i2c_id,
0228 };
0229
0230 module_i2c_driver(da9210_regulator_driver);
0231
0232 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
0233 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
0234 MODULE_LICENSE("GPL v2");