drivers/regulator/da9211-regulator.c

   1 /*
   2  * da9211-regulator.c - Regulator device driver for DA9211
   3  * Copyright (C) 2014  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
  16 #include <linux/err.h>
  17 #include <linux/gpio.h>
  18 #include <linux/i2c.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/regulator/driver.h>
  23 #include <linux/regulator/machine.h>
  24 #include <linux/regmap.h>
  25 #include <linux/irq.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/regulator/da9211.h>
  28 #include "da9211-regulator.h"
  29
  30 #define DA9211_BUCK_MODE_SLEEP  1
  31 #define DA9211_BUCK_MODE_SYNC   2
  32 #define DA9211_BUCK_MODE_AUTO   3
  33
  34 /* DA9211 REGULATOR IDs */
  35 #define DA9211_ID_BUCKA 0
  36 #define DA9211_ID_BUCKB 1
  37
  38 struct da9211 {
  39         struct device *dev;
  40         struct regmap *regmap;
  41         struct da9211_pdata *pdata;
  42         struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
  43         int num_regulator;
  44         int chip_irq;
  45 };
  46
  47 static const struct regmap_range_cfg da9211_regmap_range[] = {
  48         {
  49                 .selector_reg = DA9211_REG_PAGE_CON,
  50                 .selector_mask  = DA9211_REG_PAGE_MASK,
  51                 .selector_shift = DA9211_REG_PAGE_SHIFT,
  52                 .window_start = 0,
  53                 .window_len = 256,
  54                 .range_min = 0,
  55                 .range_max = 2*256,
  56         },
  57 };
  58
  59 static const struct regmap_config da9211_regmap_config = {
  60         .reg_bits = 8,
  61         .val_bits = 8,
  62         .max_register = 2 * 256,
  63         .ranges = da9211_regmap_range,
  64         .num_ranges = ARRAY_SIZE(da9211_regmap_range),
  65 };
  66
  67 /* Default limits measured in millivolts and milliamps */
  68 #define DA9211_MIN_MV           300
  69 #define DA9211_MAX_MV           1570
  70 #define DA9211_STEP_MV          10
  71
  72 /* Current limits for buck (uA) indices corresponds with register values */
  73 static const int da9211_current_limits[] = {
  74         2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
  75         3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
  76 };
  77
  78 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
  79 {
  80         int id = rdev_get_id(rdev);
  81         struct da9211 *chip = rdev_get_drvdata(rdev);
  82         unsigned int data;
  83         int ret, mode = 0;
  84
  85         ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
  86         if (ret < 0)
  87                 return ret;
  88
  89         switch (data & 0x03) {
  90         case DA9211_BUCK_MODE_SYNC:
  91                 mode = REGULATOR_MODE_FAST;
  92                 break;
  93         case DA9211_BUCK_MODE_AUTO:
  94                 mode = REGULATOR_MODE_NORMAL;
  95                 break;
  96         case DA9211_BUCK_MODE_SLEEP:
  97                 mode = REGULATOR_MODE_STANDBY;
  98                 break;
  99         }
 100
 101         return mode;
 102 }
 103
 104 static int da9211_buck_set_mode(struct regulator_dev *rdev,
 105                                         unsigned int mode)
 106 {
 107         int id = rdev_get_id(rdev);
 108         struct da9211 *chip = rdev_get_drvdata(rdev);
 109         int val = 0;
 110
 111         switch (mode) {
 112         case REGULATOR_MODE_FAST:
 113                 val = DA9211_BUCK_MODE_SYNC;
 114                 break;
 115         case REGULATOR_MODE_NORMAL:
 116                 val = DA9211_BUCK_MODE_AUTO;
 117                 break;
 118         case REGULATOR_MODE_STANDBY:
 119                 val = DA9211_BUCK_MODE_SLEEP;
 120                 break;
 121         }
 122
 123         return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
 124                                         0x03, val);
 125 }
 126
 127 static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
 128                                     int max)
 129 {
 130         int id = rdev_get_id(rdev);
 131         struct da9211 *chip = rdev_get_drvdata(rdev);
 132         int i;
 133
 134         /* search for closest to maximum */
 135         for (i = ARRAY_SIZE(da9211_current_limits)-1; i >= 0; i--) {
 136                 if (min <= da9211_current_limits[i] &&
 137                     max >= da9211_current_limits[i]) {
 138                                 return regmap_update_bits(chip->regmap,
 139                                         DA9211_REG_BUCK_ILIM,
 140                                         (0x0F << id*4), (i << id*4));
 141                 }
 142         }
 143
 144         return -EINVAL;
 145 }
 146
 147 static int da9211_get_current_limit(struct regulator_dev *rdev)
 148 {
 149         int id = rdev_get_id(rdev);
 150         struct da9211 *chip = rdev_get_drvdata(rdev);
 151         unsigned int data;
 152         int ret;
 153
 154         ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
 155         if (ret < 0)
 156                 return ret;
 157
 158         /* select one of 16 values: 0000 (2000mA) to 1111 (5000mA) */
 159         data = (data >> id*4) & 0x0F;
 160         return da9211_current_limits[data];
 161 }
 162
 163 static struct regulator_ops da9211_buck_ops = {
 164         .get_mode = da9211_buck_get_mode,
 165         .set_mode = da9211_buck_set_mode,
 166         .enable = regulator_enable_regmap,
 167         .disable = regulator_disable_regmap,
 168         .is_enabled = regulator_is_enabled_regmap,
 169         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 170         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 171         .list_voltage = regulator_list_voltage_linear,
 172         .set_current_limit = da9211_set_current_limit,
 173         .get_current_limit = da9211_get_current_limit,
 174 };
 175
 176 #define DA9211_BUCK(_id) \
 177 {\
 178         .name = #_id,\
 179         .ops = &da9211_buck_ops,\
 180         .type = REGULATOR_VOLTAGE,\
 181         .id = DA9211_ID_##_id,\
 182         .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
 183         .min_uV = (DA9211_MIN_MV * 1000),\
 184         .uV_step = (DA9211_STEP_MV * 1000),\
 185         .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
 186         .enable_mask = DA9211_BUCKA_EN,\
 187         .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
 188         .vsel_mask = DA9211_VBUCK_MASK,\
 189         .owner = THIS_MODULE,\
 190 }
 191
 192 static struct regulator_desc da9211_regulators[] = {
 193         DA9211_BUCK(BUCKA),
 194         DA9211_BUCK(BUCKB),
 195 };
 196
 197 static irqreturn_t da9211_irq_handler(int irq, void *data)
 198 {
 199         struct da9211 *chip = data;
 200         int reg_val, err, ret = IRQ_NONE;
 201
 202         err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
 203         if (err < 0)
 204                 goto error_i2c;
 205
 206         if (reg_val & DA9211_E_OV_CURR_A) {
 207                 regulator_notifier_call_chain(chip->rdev[0],
 208                         REGULATOR_EVENT_OVER_CURRENT,
 209                         rdev_get_drvdata(chip->rdev[0]));
 210
 211                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 212                         DA9211_E_OV_CURR_A);
 213                 if (err < 0)
 214                         goto error_i2c;
 215
 216                 ret = IRQ_HANDLED;
 217         }
 218
 219         if (reg_val & DA9211_E_OV_CURR_B) {
 220                 regulator_notifier_call_chain(chip->rdev[1],
 221                         REGULATOR_EVENT_OVER_CURRENT,
 222                         rdev_get_drvdata(chip->rdev[1]));
 223
 224                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 225                         DA9211_E_OV_CURR_B);
 226                 if (err < 0)
 227                         goto error_i2c;
 228
 229                 ret = IRQ_HANDLED;
 230         }
 231
 232         return ret;
 233
 234 error_i2c:
 235         dev_err(chip->dev, "I2C error : %d\n", err);
 236         return IRQ_NONE;
 237 }
 238
 239 static int da9211_regulator_init(struct da9211 *chip)
 240 {
 241         struct regulator_config config = { };
 242         int i, ret;
 243         unsigned int data;
 244
 245         ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
 246         if (ret < 0) {
 247                 dev_err(chip->dev, "Failed to read CONTROL_E reg: %d\n", ret);
 248                 return ret;
 249         }
 250
 251         data &= DA9211_SLAVE_SEL;
 252         /* If configuration for 1/2 bucks is different between platform data
 253          * and the register, driver should exit.
 254          */
 255         if ((chip->pdata->num_buck == 2 && data == 0x40)
 256                 || (chip->pdata->num_buck == 1 && data == 0x00)) {
 257                 if (data == 0)
 258                         chip->num_regulator = 1;
 259                 else
 260                         chip->num_regulator = 2;
 261         } else {
 262                 dev_err(chip->dev, "Configuration is mismatched\n");
 263                 return -EINVAL;
 264         }
 265
 266         for (i = 0; i < chip->num_regulator; i++) {
 267                 if (chip->pdata)
 268                         config.init_data =
 269                                 &(chip->pdata->init_data[i]);
 270
 271                 config.dev = chip->dev;
 272                 config.driver_data = chip;
 273                 config.regmap = chip->regmap;
 274
 275                 chip->rdev[i] = devm_regulator_register(chip->dev,
 276                         &da9211_regulators[i], &config);
 277                 if (IS_ERR(chip->rdev[i])) {
 278                         dev_err(chip->dev,
 279                                 "Failed to register DA9211 regulator\n");
 280                         return PTR_ERR(chip->rdev[i]);
 281                 }
 282
 283                 if (chip->chip_irq != 0) {
 284                         ret = regmap_update_bits(chip->regmap,
 285                                 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 1);
 286                         if (ret < 0) {
 287                                 dev_err(chip->dev,
 288                                         "Failed to update mask reg: %d\n", ret);
 289                                 return ret;
 290                         }
 291                 }
 292         }
 293
 294         return 0;
 295 }
 296 /*
 297  * I2C driver interface functions
 298  */
 299 static int da9211_i2c_probe(struct i2c_client *i2c,
 300                 const struct i2c_device_id *id)
 301 {
 302         struct da9211 *chip;
 303         int error, ret;
 304
 305         chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
 306
 307         chip->dev = &i2c->dev;
 308         chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
 309         if (IS_ERR(chip->regmap)) {
 310                 error = PTR_ERR(chip->regmap);
 311                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 312                         error);
 313                 return error;
 314         }
 315
 316         i2c_set_clientdata(i2c, chip);
 317
 318         chip->pdata = i2c->dev.platform_data;
 319         if (!chip->pdata) {
 320                 dev_err(&i2c->dev, "No platform init data supplied\n");
 321                 return -ENODEV;
 322         }
 323
 324         chip->chip_irq = i2c->irq;
 325
 326         if (chip->chip_irq != 0) {
 327                 ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
 328                                         da9211_irq_handler,
 329                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 330                                         "da9211", chip);
 331                 if (ret != 0) {
 332                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 333                                 chip->chip_irq);
 334                         return ret;
 335                 }
 336         } else {
 337                 dev_warn(chip->dev, "No IRQ configured\n");
 338         }
 339
 340         ret = da9211_regulator_init(chip);
 341
 342         if (ret < 0)
 343                 dev_err(&i2c->dev, "Failed to initialize regulator: %d\n", ret);
 344
 345         return ret;
 346 }
 347
 348 static const struct i2c_device_id da9211_i2c_id[] = {
 349         {"da9211", 0},
 350         {},
 351 };
 352
 353 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
 354
 355 static struct i2c_driver da9211_regulator_driver = {
 356         .driver = {
 357                 .name = "da9211",
 358                 .owner = THIS_MODULE,
 359         },
 360         .probe = da9211_i2c_probe,
 361         .id_table = da9211_i2c_id,
 362 };
 363
 364 module_i2c_driver(da9211_regulator_driver);
 365
 366 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 367 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211");
 368 MODULE_LICENSE("GPL v2");