drivers/regulator/da9210-regulator.c

   1 /*
   2  * da9210-regulator.c - Regulator device driver for DA9210
   3  * Copyright (C) 2013  Dialog Semiconductor Ltd.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  18  * Boston, MA  02110-1301, USA.
  19  */
  20
  21 #include <linux/err.h>
  22 #include <linux/i2c.h>
  23 #include <linux/module.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irq.h>
  26 #include <linux/regulator/driver.h>
  27 #include <linux/regulator/machine.h>
  28 #include <linux/of_device.h>
  29 #include <linux/regulator/of_regulator.h>
  30 #include <linux/regmap.h>
  31
  32 #include "da9210-regulator.h"
  33
  34 struct da9210 {
  35         struct regulator_dev *rdev;
  36         struct regmap *regmap;
  37 };
  38
  39 static const struct regmap_config da9210_regmap_config = {
  40         .reg_bits = 8,
  41         .val_bits = 8,
  42 };
  43
  44 static const struct regulator_ops da9210_buck_ops = {
  45         .enable = regulator_enable_regmap,
  46         .disable = regulator_disable_regmap,
  47         .is_enabled = regulator_is_enabled_regmap,
  48         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  49         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  50         .list_voltage = regulator_list_voltage_linear,
  51         .set_current_limit = regulator_set_current_limit_regmap,
  52         .get_current_limit = regulator_get_current_limit_regmap,
  53 };
  54
  55 /* Default limits measured in millivolts and milliamps */
  56 #define DA9210_MIN_MV           300
  57 #define DA9210_MAX_MV           1570
  58 #define DA9210_STEP_MV          10
  59
  60 /* Current limits for buck (uA) indices corresponds with register values */
  61 static const unsigned int da9210_buck_limits[] = {
  62         1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
  63         3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
  64 };
  65
  66 static const struct regulator_desc da9210_reg = {
  67         .name = "DA9210",
  68         .id = 0,
  69         .ops = &da9210_buck_ops,
  70         .type = REGULATOR_VOLTAGE,
  71         .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
  72         .min_uV = (DA9210_MIN_MV * 1000),
  73         .uV_step = (DA9210_STEP_MV * 1000),
  74         .vsel_reg = DA9210_REG_VBUCK_A,
  75         .vsel_mask = DA9210_VBUCK_MASK,
  76         .enable_reg = DA9210_REG_BUCK_CONT,
  77         .enable_mask = DA9210_BUCK_EN,
  78         .owner = THIS_MODULE,
  79         .curr_table = da9210_buck_limits,
  80         .n_current_limits = ARRAY_SIZE(da9210_buck_limits),
  81         .csel_reg = DA9210_REG_BUCK_ILIM,
  82         .csel_mask = DA9210_BUCK_ILIM_MASK,
  83 };
  84
  85 static irqreturn_t da9210_irq_handler(int irq, void *data)
  86 {
  87         struct da9210 *chip = data;
  88         unsigned int val, handled = 0;
  89         int error, ret = IRQ_NONE;
  90
  91         error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
  92         if (error < 0)
  93                 goto error_i2c;
  94
  95         regulator_lock(chip->rdev);
  96
  97         if (val & DA9210_E_OVCURR) {
  98                 regulator_notifier_call_chain(chip->rdev,
  99                                               REGULATOR_EVENT_OVER_CURRENT,
 100                                               NULL);
 101                 handled |= DA9210_E_OVCURR;
 102         }
 103         if (val & DA9210_E_NPWRGOOD) {
 104                 regulator_notifier_call_chain(chip->rdev,
 105                                               REGULATOR_EVENT_UNDER_VOLTAGE,
 106                                               NULL);
 107                 handled |= DA9210_E_NPWRGOOD;
 108         }
 109         if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
 110                 regulator_notifier_call_chain(chip->rdev,
 111                                               REGULATOR_EVENT_OVER_TEMP, NULL);
 112                 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
 113         }
 114         if (val & DA9210_E_VMAX) {
 115                 regulator_notifier_call_chain(chip->rdev,
 116                                               REGULATOR_EVENT_REGULATION_OUT,
 117                                               NULL);
 118                 handled |= DA9210_E_VMAX;
 119         }
 120
 121         regulator_unlock(chip->rdev);
 122
 123         if (handled) {
 124                 /* Clear handled events */
 125                 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
 126                 if (error < 0)
 127                         goto error_i2c;
 128
 129                 ret = IRQ_HANDLED;
 130         }
 131
 132         return ret;
 133
 134 error_i2c:
 135         dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
 136         return ret;
 137 }
 138
 139 /*
 140  * I2C driver interface functions
 141  */
 142
 143 static const struct of_device_id da9210_dt_ids[] = {
 144         { .compatible = "dlg,da9210", },
 145         { }
 146 };
 147 MODULE_DEVICE_TABLE(of, da9210_dt_ids);
 148
 149 static int da9210_i2c_probe(struct i2c_client *i2c,
 150                             const struct i2c_device_id *id)
 151 {
 152         struct da9210 *chip;
 153         struct device *dev = &i2c->dev;
 154         struct da9210_pdata *pdata = dev_get_platdata(dev);
 155         struct regulator_dev *rdev = NULL;
 156         struct regulator_config config = { };
 157         int error;
 158         const struct of_device_id *match;
 159
 160         if (i2c->dev.of_node && !pdata) {
 161                 match = of_match_device(of_match_ptr(da9210_dt_ids),
 162                                                 &i2c->dev);
 163                 if (!match) {
 164                         dev_err(&i2c->dev, "Error: No device match found\n");
 165                         return -ENODEV;
 166                 }
 167         }
 168
 169         chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
 170         if (!chip)
 171                 return -ENOMEM;
 172
 173         chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
 174         if (IS_ERR(chip->regmap)) {
 175                 error = PTR_ERR(chip->regmap);
 176                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 177                         error);
 178                 return error;
 179         }
 180
 181         config.dev = &i2c->dev;
 182         config.init_data = pdata ? &pdata->da9210_constraints :
 183                 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
 184         config.driver_data = chip;
 185         config.regmap = chip->regmap;
 186         config.of_node = dev->of_node;
 187
 188         /* Mask all interrupt sources to deassert interrupt line */
 189         error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
 190         if (!error)
 191                 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
 192         if (error) {
 193                 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
 194                 return error;
 195         }
 196
 197         rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
 198         if (IS_ERR(rdev)) {
 199                 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
 200                 return PTR_ERR(rdev);
 201         }
 202
 203         chip->rdev = rdev;
 204         if (i2c->irq) {
 205                 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 206                                                   da9210_irq_handler,
 207                                                   IRQF_TRIGGER_LOW |
 208                                                   IRQF_ONESHOT | IRQF_SHARED,
 209                                                   "da9210", chip);
 210                 if (error) {
 211                         dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
 212                                 i2c->irq, error);
 213                         return error;
 214                 }
 215
 216                 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
 217                                          DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
 218                                          DA9210_M_TEMP_WARN |
 219                                          DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
 220                 if (error < 0) {
 221                         dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
 222                                 error);
 223                         return error;
 224                 }
 225         } else {
 226                 dev_warn(&i2c->dev, "No IRQ configured\n");
 227         }
 228
 229         i2c_set_clientdata(i2c, chip);
 230
 231         return 0;
 232 }
 233
 234 static const struct i2c_device_id da9210_i2c_id[] = {
 235         {"da9210", 0},
 236         {},
 237 };
 238
 239 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
 240
 241 static struct i2c_driver da9210_regulator_driver = {
 242         .driver = {
 243                 .name = "da9210",
 244                 .of_match_table = of_match_ptr(da9210_dt_ids),
 245         },
 246         .probe = da9210_i2c_probe,
 247         .id_table = da9210_i2c_id,
 248 };
 249
 250 module_i2c_driver(da9210_regulator_driver);
 251
 252 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 253 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
 254 MODULE_LICENSE("GPL v2");