drivers/regulator/pv88080-regulator.c

   1 /*
   2  * pv88080-regulator.c - Regulator device driver for PV88080
   3  * Copyright (C) 2016  Powerventure Semiconductor Ltd.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program 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
  13  * GNU 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/of_regulator.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/uaccess.h>
  30 #include "pv88080-regulator.h"
  31
  32 #define PV88080_MAX_REGULATORS  3
  33
  34 /* PV88080 REGULATOR IDs */
  35 enum {
  36         /* BUCKs */
  37         PV88080_ID_BUCK1,
  38         PV88080_ID_BUCK2,
  39         PV88080_ID_BUCK3,
  40 };
  41
  42 struct pv88080_regulator {
  43         struct regulator_desc desc;
  44         /* Current limiting */
  45         unsigned int n_current_limits;
  46         const int *current_limits;
  47         unsigned int limit_mask;
  48         unsigned int conf;
  49         unsigned int conf2;
  50         unsigned int conf5;
  51 };
  52
  53 struct pv88080 {
  54         struct device *dev;
  55         struct regmap *regmap;
  56         struct regulator_dev *rdev[PV88080_MAX_REGULATORS];
  57 };
  58
  59 struct pv88080_buck_voltage {
  60         int min_uV;
  61         int max_uV;
  62         int uV_step;
  63 };
  64
  65 static const struct regmap_config pv88080_regmap_config = {
  66         .reg_bits = 8,
  67         .val_bits = 8,
  68 };
  69
  70 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
  71  * Entry indexes corresponds to register values.
  72  */
  73
  74 static const int pv88080_buck1_limits[] = {
  75         3230000, 5130000, 6960000, 8790000
  76 };
  77
  78 static const int pv88080_buck23_limits[] = {
  79         1496000, 2393000, 3291000, 4189000
  80 };
  81
  82 static const struct pv88080_buck_voltage pv88080_buck_vol[2] = {
  83         {
  84                 .min_uV = 600000,
  85                 .max_uV = 1393750,
  86                 .uV_step = 6250,
  87         },
  88         {
  89                 .min_uV = 1400000,
  90                 .max_uV = 2193750,
  91                 .uV_step = 6250,
  92         },
  93 };
  94
  95 static unsigned int pv88080_buck_get_mode(struct regulator_dev *rdev)
  96 {
  97         struct pv88080_regulator *info = rdev_get_drvdata(rdev);
  98         unsigned int data;
  99         int ret, mode = 0;
 100
 101         ret = regmap_read(rdev->regmap, info->conf, &data);
 102         if (ret < 0)
 103                 return ret;
 104
 105         switch (data & PV88080_BUCK1_MODE_MASK) {
 106         case PV88080_BUCK_MODE_SYNC:
 107                 mode = REGULATOR_MODE_FAST;
 108                 break;
 109         case PV88080_BUCK_MODE_AUTO:
 110                 mode = REGULATOR_MODE_NORMAL;
 111                 break;
 112         case PV88080_BUCK_MODE_SLEEP:
 113                 mode = REGULATOR_MODE_STANDBY;
 114                 break;
 115         default:
 116                 return -EINVAL;
 117         }
 118
 119         return mode;
 120 }
 121
 122 static int pv88080_buck_set_mode(struct regulator_dev *rdev,
 123                                         unsigned int mode)
 124 {
 125         struct pv88080_regulator *info = rdev_get_drvdata(rdev);
 126         int val = 0;
 127
 128         switch (mode) {
 129         case REGULATOR_MODE_FAST:
 130                 val = PV88080_BUCK_MODE_SYNC;
 131                 break;
 132         case REGULATOR_MODE_NORMAL:
 133                 val = PV88080_BUCK_MODE_AUTO;
 134                 break;
 135         case REGULATOR_MODE_STANDBY:
 136                 val = PV88080_BUCK_MODE_SLEEP;
 137                 break;
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         return regmap_update_bits(rdev->regmap, info->conf,
 143                                         PV88080_BUCK1_MODE_MASK, val);
 144 }
 145
 146 static int pv88080_set_current_limit(struct regulator_dev *rdev, int min,
 147                                     int max)
 148 {
 149         struct pv88080_regulator *info = rdev_get_drvdata(rdev);
 150         int i;
 151
 152         /* search for closest to maximum */
 153         for (i = info->n_current_limits; i >= 0; i--) {
 154                 if (min <= info->current_limits[i]
 155                         && max >= info->current_limits[i]) {
 156                                 return regmap_update_bits(rdev->regmap,
 157                                         info->conf,
 158                                         info->limit_mask,
 159                                         i << PV88080_BUCK1_ILIM_SHIFT);
 160                 }
 161         }
 162
 163         return -EINVAL;
 164 }
 165
 166 static int pv88080_get_current_limit(struct regulator_dev *rdev)
 167 {
 168         struct pv88080_regulator *info = rdev_get_drvdata(rdev);
 169         unsigned int data;
 170         int ret;
 171
 172         ret = regmap_read(rdev->regmap, info->conf, &data);
 173         if (ret < 0)
 174                 return ret;
 175
 176         data = (data & info->limit_mask) >> PV88080_BUCK1_ILIM_SHIFT;
 177         return info->current_limits[data];
 178 }
 179
 180 static struct regulator_ops pv88080_buck_ops = {
 181         .get_mode = pv88080_buck_get_mode,
 182         .set_mode = pv88080_buck_set_mode,
 183         .enable = regulator_enable_regmap,
 184         .disable = regulator_disable_regmap,
 185         .is_enabled = regulator_is_enabled_regmap,
 186         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 187         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 188         .list_voltage = regulator_list_voltage_linear,
 189         .set_current_limit = pv88080_set_current_limit,
 190         .get_current_limit = pv88080_get_current_limit,
 191 };
 192
 193 #define PV88080_BUCK(chip, regl_name, min, step, max, limits_array) \
 194 {\
 195         .desc   =       {\
 196                 .id = chip##_ID_##regl_name,\
 197                 .name = __stringify(chip##_##regl_name),\
 198                 .of_match = of_match_ptr(#regl_name),\
 199                 .regulators_node = of_match_ptr("regulators"),\
 200                 .type = REGULATOR_VOLTAGE,\
 201                 .owner = THIS_MODULE,\
 202                 .ops = &pv88080_buck_ops,\
 203                 .min_uV = min, \
 204                 .uV_step = step, \
 205                 .n_voltages = ((max) - (min))/(step) + 1, \
 206                 .enable_reg = PV88080_REG_##regl_name##_CONF0, \
 207                 .enable_mask = PV88080_##regl_name##_EN, \
 208                 .vsel_reg = PV88080_REG_##regl_name##_CONF0, \
 209                 .vsel_mask = PV88080_V##regl_name##_MASK, \
 210         },\
 211         .current_limits = limits_array, \
 212         .n_current_limits = ARRAY_SIZE(limits_array), \
 213         .limit_mask = PV88080_##regl_name##_ILIM_MASK, \
 214         .conf = PV88080_REG_##regl_name##_CONF1, \
 215         .conf2 = PV88080_REG_##regl_name##_CONF2, \
 216         .conf5 = PV88080_REG_##regl_name##_CONF5, \
 217 }
 218
 219 static struct pv88080_regulator pv88080_regulator_info[] = {
 220         PV88080_BUCK(PV88080, BUCK1, 600000, 6250, 1393750,
 221                 pv88080_buck1_limits),
 222         PV88080_BUCK(PV88080, BUCK2, 600000, 6250, 1393750,
 223                 pv88080_buck23_limits),
 224         PV88080_BUCK(PV88080, BUCK3, 600000, 6250, 1393750,
 225                 pv88080_buck23_limits),
 226 };
 227
 228 static irqreturn_t pv88080_irq_handler(int irq, void *data)
 229 {
 230         struct pv88080 *chip = data;
 231         int i, reg_val, err, ret = IRQ_NONE;
 232
 233         err = regmap_read(chip->regmap, PV88080_REG_EVENT_A, &reg_val);
 234         if (err < 0)
 235                 goto error_i2c;
 236
 237         if (reg_val & PV88080_E_VDD_FLT) {
 238                 for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
 239                         if (chip->rdev[i] != NULL) {
 240                                 regulator_notifier_call_chain(chip->rdev[i],
 241                                         REGULATOR_EVENT_UNDER_VOLTAGE,
 242                                         NULL);
 243                         }
 244                 }
 245
 246                 err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
 247                         PV88080_E_VDD_FLT);
 248                 if (err < 0)
 249                         goto error_i2c;
 250
 251                 ret = IRQ_HANDLED;
 252         }
 253
 254         if (reg_val & PV88080_E_OVER_TEMP) {
 255                 for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
 256                         if (chip->rdev[i] != NULL) {
 257                                 regulator_notifier_call_chain(chip->rdev[i],
 258                                         REGULATOR_EVENT_OVER_TEMP,
 259                                         NULL);
 260                         }
 261                 }
 262
 263                 err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
 264                         PV88080_E_OVER_TEMP);
 265                 if (err < 0)
 266                         goto error_i2c;
 267
 268                 ret = IRQ_HANDLED;
 269         }
 270
 271         return ret;
 272
 273 error_i2c:
 274         dev_err(chip->dev, "I2C error : %d\n", err);
 275         return IRQ_NONE;
 276 }
 277
 278 /*
 279  * I2C driver interface functions
 280  */
 281 static int pv88080_i2c_probe(struct i2c_client *i2c,
 282                 const struct i2c_device_id *id)
 283 {
 284         struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 285         struct pv88080 *chip;
 286         struct regulator_config config = { };
 287         int i, error, ret;
 288         unsigned int conf2, conf5;
 289
 290         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88080), GFP_KERNEL);
 291         if (!chip)
 292                 return -ENOMEM;
 293
 294         chip->dev = &i2c->dev;
 295         chip->regmap = devm_regmap_init_i2c(i2c, &pv88080_regmap_config);
 296         if (IS_ERR(chip->regmap)) {
 297                 error = PTR_ERR(chip->regmap);
 298                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 299                         error);
 300                 return error;
 301         }
 302
 303         i2c_set_clientdata(i2c, chip);
 304
 305         if (i2c->irq != 0) {
 306                 ret = regmap_write(chip->regmap, PV88080_REG_MASK_A, 0xFF);
 307                 if (ret < 0) {
 308                         dev_err(chip->dev,
 309                                 "Failed to mask A reg: %d\n", ret);
 310                         return ret;
 311                 }
 312                 ret = regmap_write(chip->regmap, PV88080_REG_MASK_B, 0xFF);
 313                 if (ret < 0) {
 314                         dev_err(chip->dev,
 315                                 "Failed to mask B reg: %d\n", ret);
 316                         return ret;
 317                 }
 318                 ret = regmap_write(chip->regmap, PV88080_REG_MASK_C, 0xFF);
 319                 if (ret < 0) {
 320                         dev_err(chip->dev,
 321                                 "Failed to mask C reg: %d\n", ret);
 322                         return ret;
 323                 }
 324
 325                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 326                                         pv88080_irq_handler,
 327                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 328                                         "pv88080", chip);
 329                 if (ret != 0) {
 330                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 331                                 i2c->irq);
 332                         return ret;
 333                 }
 334
 335                 ret = regmap_update_bits(chip->regmap, PV88080_REG_MASK_A,
 336                         PV88080_M_VDD_FLT | PV88080_M_OVER_TEMP, 0);
 337                 if (ret < 0) {
 338                         dev_err(chip->dev,
 339                                 "Failed to update mask reg: %d\n", ret);
 340                         return ret;
 341                 }
 342
 343         } else {
 344                 dev_warn(chip->dev, "No IRQ configured\n");
 345         }
 346
 347         config.dev = chip->dev;
 348         config.regmap = chip->regmap;
 349
 350         for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
 351                 if (init_data)
 352                         config.init_data = &init_data[i];
 353
 354                 ret = regmap_read(chip->regmap,
 355                         pv88080_regulator_info[i].conf2, &conf2);
 356                 if (ret < 0)
 357                         return ret;
 358
 359                 conf2 = ((conf2 >> PV88080_BUCK_VDAC_RANGE_SHIFT) &
 360                         PV88080_BUCK_VDAC_RANGE_MASK);
 361
 362                 ret = regmap_read(chip->regmap,
 363                         pv88080_regulator_info[i].conf5, &conf5);
 364                 if (ret < 0)
 365                         return ret;
 366
 367                 conf5 = ((conf5 >> PV88080_BUCK_VRANGE_GAIN_SHIFT) &
 368                         PV88080_BUCK_VRANGE_GAIN_MASK);
 369
 370                 pv88080_regulator_info[i].desc.min_uV =
 371                         pv88080_buck_vol[conf2].min_uV * (conf5+1);
 372                 pv88080_regulator_info[i].desc.uV_step =
 373                         pv88080_buck_vol[conf2].uV_step * (conf5+1);
 374                 pv88080_regulator_info[i].desc.n_voltages =
 375                         ((pv88080_buck_vol[conf2].max_uV * (conf5+1))
 376                         - (pv88080_regulator_info[i].desc.min_uV))
 377                         /(pv88080_regulator_info[i].desc.uV_step) + 1;
 378
 379                 config.driver_data = (void *)&pv88080_regulator_info[i];
 380                 chip->rdev[i] = devm_regulator_register(chip->dev,
 381                         &pv88080_regulator_info[i].desc, &config);
 382                 if (IS_ERR(chip->rdev[i])) {
 383                         dev_err(chip->dev,
 384                                 "Failed to register PV88080 regulator\n");
 385                         return PTR_ERR(chip->rdev[i]);
 386                 }
 387         }
 388
 389         return 0;
 390 }
 391
 392 static const struct i2c_device_id pv88080_i2c_id[] = {
 393         {"pv88080", 0},
 394         {},
 395 };
 396 MODULE_DEVICE_TABLE(i2c, pv88080_i2c_id);
 397
 398 #ifdef CONFIG_OF
 399 static const struct of_device_id pv88080_dt_ids[] = {
 400         { .compatible = "pvs,pv88080", .data = &pv88080_i2c_id[0] },
 401         {},
 402 };
 403 MODULE_DEVICE_TABLE(of, pv88080_dt_ids);
 404 #endif
 405
 406 static struct i2c_driver pv88080_regulator_driver = {
 407         .driver = {
 408                 .name = "pv88080",
 409                 .of_match_table = of_match_ptr(pv88080_dt_ids),
 410         },
 411         .probe = pv88080_i2c_probe,
 412         .id_table = pv88080_i2c_id,
 413 };
 414
 415 module_i2c_driver(pv88080_regulator_driver);
 416
 417 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 418 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88080");
 419 MODULE_LICENSE("GPL");