drivers/regulator/da9210-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // da9210-regulator.c - Regulator device driver for DA9210
   4 // Copyright (C) 2013  Dialog Semiconductor Ltd.
   5
   6 #include <linux/err.h>
   7 #include <linux/i2c.h>
   8 #include <linux/module.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/irq.h>
  11 #include <linux/regulator/driver.h>
  12 #include <linux/regulator/machine.h>
  13 #include <linux/of_device.h>
  14 #include <linux/regulator/of_regulator.h>
  15 #include <linux/regmap.h>
  16
  17 #include "da9210-regulator.h"
  18
  19 struct da9210 {
  20         struct regulator_dev *rdev;
  21         struct regmap *regmap;
  22 };
  23
  24 static const struct regmap_config da9210_regmap_config = {
  25         .reg_bits = 8,
  26         .val_bits = 8,
  27 };
  28
  29 static const struct regulator_ops da9210_buck_ops = {
  30         .enable = regulator_enable_regmap,
  31         .disable = regulator_disable_regmap,
  32         .is_enabled = regulator_is_enabled_regmap,
  33         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  34         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  35         .list_voltage = regulator_list_voltage_linear,
  36         .set_current_limit = regulator_set_current_limit_regmap,
  37         .get_current_limit = regulator_get_current_limit_regmap,
  38 };
  39
  40 /* Default limits measured in millivolts and milliamps */
  41 #define DA9210_MIN_MV           300
  42 #define DA9210_MAX_MV           1570
  43 #define DA9210_STEP_MV          10
  44
  45 /* Current limits for buck (uA) indices corresponds with register values */
  46 static const unsigned int da9210_buck_limits[] = {
  47         1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
  48         3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
  49 };
  50
  51 static const struct regulator_desc da9210_reg = {
  52         .name = "DA9210",
  53         .id = 0,
  54         .ops = &da9210_buck_ops,
  55         .type = REGULATOR_VOLTAGE,
  56         .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
  57         .min_uV = (DA9210_MIN_MV * 1000),
  58         .uV_step = (DA9210_STEP_MV * 1000),
  59         .vsel_reg = DA9210_REG_VBUCK_A,
  60         .vsel_mask = DA9210_VBUCK_MASK,
  61         .enable_reg = DA9210_REG_BUCK_CONT,
  62         .enable_mask = DA9210_BUCK_EN,
  63         .owner = THIS_MODULE,
  64         .curr_table = da9210_buck_limits,
  65         .n_current_limits = ARRAY_SIZE(da9210_buck_limits),
  66         .csel_reg = DA9210_REG_BUCK_ILIM,
  67         .csel_mask = DA9210_BUCK_ILIM_MASK,
  68 };
  69
  70 static irqreturn_t da9210_irq_handler(int irq, void *data)
  71 {
  72         struct da9210 *chip = data;
  73         unsigned int val, handled = 0;
  74         int error, ret = IRQ_NONE;
  75
  76         error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
  77         if (error < 0)
  78                 goto error_i2c;
  79
  80         regulator_lock(chip->rdev);
  81
  82         if (val & DA9210_E_OVCURR) {
  83                 regulator_notifier_call_chain(chip->rdev,
  84                                               REGULATOR_EVENT_OVER_CURRENT,
  85                                               NULL);
  86                 handled |= DA9210_E_OVCURR;
  87         }
  88         if (val & DA9210_E_NPWRGOOD) {
  89                 regulator_notifier_call_chain(chip->rdev,
  90                                               REGULATOR_EVENT_UNDER_VOLTAGE,
  91                                               NULL);
  92                 handled |= DA9210_E_NPWRGOOD;
  93         }
  94         if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
  95                 regulator_notifier_call_chain(chip->rdev,
  96                                               REGULATOR_EVENT_OVER_TEMP, NULL);
  97                 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
  98         }
  99         if (val & DA9210_E_VMAX) {
 100                 regulator_notifier_call_chain(chip->rdev,
 101                                               REGULATOR_EVENT_REGULATION_OUT,
 102                                               NULL);
 103                 handled |= DA9210_E_VMAX;
 104         }
 105
 106         regulator_unlock(chip->rdev);
 107
 108         if (handled) {
 109                 /* Clear handled events */
 110                 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
 111                 if (error < 0)
 112                         goto error_i2c;
 113
 114                 ret = IRQ_HANDLED;
 115         }
 116
 117         return ret;
 118
 119 error_i2c:
 120         dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
 121         return ret;
 122 }
 123
 124 /*
 125  * I2C driver interface functions
 126  */
 127
 128 static const struct of_device_id da9210_dt_ids[] = {
 129         { .compatible = "dlg,da9210", },
 130         { }
 131 };
 132 MODULE_DEVICE_TABLE(of, da9210_dt_ids);
 133
 134 static int da9210_i2c_probe(struct i2c_client *i2c,
 135                             const struct i2c_device_id *id)
 136 {
 137         struct da9210 *chip;
 138         struct device *dev = &i2c->dev;
 139         struct da9210_pdata *pdata = dev_get_platdata(dev);
 140         struct regulator_dev *rdev = NULL;
 141         struct regulator_config config = { };
 142         int error;
 143         const struct of_device_id *match;
 144
 145         if (i2c->dev.of_node && !pdata) {
 146                 match = of_match_device(of_match_ptr(da9210_dt_ids),
 147                                                 &i2c->dev);
 148                 if (!match) {
 149                         dev_err(&i2c->dev, "Error: No device match found\n");
 150                         return -ENODEV;
 151                 }
 152         }
 153
 154         chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
 155         if (!chip)
 156                 return -ENOMEM;
 157
 158         chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
 159         if (IS_ERR(chip->regmap)) {
 160                 error = PTR_ERR(chip->regmap);
 161                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 162                         error);
 163                 return error;
 164         }
 165
 166         config.dev = &i2c->dev;
 167         config.init_data = pdata ? &pdata->da9210_constraints :
 168                 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
 169         config.driver_data = chip;
 170         config.regmap = chip->regmap;
 171         config.of_node = dev->of_node;
 172
 173         /* Mask all interrupt sources to deassert interrupt line */
 174         error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
 175         if (!error)
 176                 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
 177         if (error) {
 178                 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
 179                 return error;
 180         }
 181
 182         rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
 183         if (IS_ERR(rdev)) {
 184                 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
 185                 return PTR_ERR(rdev);
 186         }
 187
 188         chip->rdev = rdev;
 189         if (i2c->irq) {
 190                 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 191                                                   da9210_irq_handler,
 192                                                   IRQF_TRIGGER_LOW |
 193                                                   IRQF_ONESHOT | IRQF_SHARED,
 194                                                   "da9210", chip);
 195                 if (error) {
 196                         dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
 197                                 i2c->irq, error);
 198                         return error;
 199                 }
 200
 201                 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
 202                                          DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
 203                                          DA9210_M_TEMP_WARN |
 204                                          DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
 205                 if (error < 0) {
 206                         dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
 207                                 error);
 208                         return error;
 209                 }
 210         } else {
 211                 dev_warn(&i2c->dev, "No IRQ configured\n");
 212         }
 213
 214         i2c_set_clientdata(i2c, chip);
 215
 216         return 0;
 217 }
 218
 219 static const struct i2c_device_id da9210_i2c_id[] = {
 220         {"da9210", 0},
 221         {},
 222 };
 223
 224 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
 225
 226 static struct i2c_driver da9210_regulator_driver = {
 227         .driver = {
 228                 .name = "da9210",
 229                 .of_match_table = of_match_ptr(da9210_dt_ids),
 230         },
 231         .probe = da9210_i2c_probe,
 232         .id_table = da9210_i2c_id,
 233 };
 234
 235 module_i2c_driver(da9210_regulator_driver);
 236
 237 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 238 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
 239 MODULE_LICENSE("GPL v2");