drivers/regulator/pv88090-regulator.c

   1 /*
   2  * pv88090-regulator.c - Regulator device driver for PV88090
   3  * Copyright (C) 2015  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/i2c.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/regulator/machine.h>
  23 #include <linux/regmap.h>
  24 #include <linux/irq.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/regulator/of_regulator.h>
  27 #include "pv88090-regulator.h"
  28
  29 #define PV88090_MAX_REGULATORS  5
  30
  31 /* PV88090 REGULATOR IDs */
  32 enum {
  33         /* BUCKs */
  34         PV88090_ID_BUCK1,
  35         PV88090_ID_BUCK2,
  36         PV88090_ID_BUCK3,
  37
  38         /* LDOs */
  39         PV88090_ID_LDO1,
  40         PV88090_ID_LDO2,
  41 };
  42
  43 struct pv88090_regulator {
  44         struct regulator_desc desc;
  45         /* Current limiting */
  46         unsigned        n_current_limits;
  47         const int       *current_limits;
  48         unsigned int limit_mask;
  49         unsigned int conf;
  50         unsigned int conf2;
  51 };
  52
  53 struct pv88090 {
  54         struct device *dev;
  55         struct regmap *regmap;
  56         struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
  57 };
  58
  59 struct pv88090_buck_voltage {
  60         int min_uV;
  61         int max_uV;
  62         int uV_step;
  63 };
  64
  65 static const struct regmap_config pv88090_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 pv88090_buck1_limits[] = {
  75          220000,  440000,  660000,  880000, 1100000, 1320000, 1540000, 1760000,
  76         1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
  77         3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
  78         5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
  79 };
  80
  81 static const int pv88090_buck23_limits[] = {
  82         1496000, 2393000, 3291000, 4189000
  83 };
  84
  85 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
  86         {
  87                 .min_uV = 600000,
  88                 .max_uV = 1393750,
  89                 .uV_step = 6250,
  90         },
  91
  92         {
  93                 .min_uV = 1400000,
  94                 .max_uV = 2193750,
  95                 .uV_step = 6250,
  96         },
  97         {
  98                 .min_uV = 1250000,
  99                 .max_uV = 2837500,
 100                 .uV_step = 12500,
 101         },
 102 };
 103
 104 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
 105 {
 106         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 107         unsigned int data;
 108         int ret, mode = 0;
 109
 110         ret = regmap_read(rdev->regmap, info->conf, &data);
 111         if (ret < 0)
 112                 return ret;
 113
 114         switch (data & PV88090_BUCK1_MODE_MASK) {
 115         case PV88090_BUCK_MODE_SYNC:
 116                 mode = REGULATOR_MODE_FAST;
 117                 break;
 118         case PV88090_BUCK_MODE_AUTO:
 119                 mode = REGULATOR_MODE_NORMAL;
 120                 break;
 121         case PV88090_BUCK_MODE_SLEEP:
 122                 mode = REGULATOR_MODE_STANDBY;
 123                 break;
 124         }
 125
 126         return mode;
 127 }
 128
 129 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
 130                                         unsigned int mode)
 131 {
 132         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 133         int val = 0;
 134
 135         switch (mode) {
 136         case REGULATOR_MODE_FAST:
 137                 val = PV88090_BUCK_MODE_SYNC;
 138                 break;
 139         case REGULATOR_MODE_NORMAL:
 140                 val = PV88090_BUCK_MODE_AUTO;
 141                 break;
 142         case REGULATOR_MODE_STANDBY:
 143                 val = PV88090_BUCK_MODE_SLEEP;
 144                 break;
 145         default:
 146                 return -EINVAL;
 147         }
 148
 149         return regmap_update_bits(rdev->regmap, info->conf,
 150                                         PV88090_BUCK1_MODE_MASK, val);
 151 }
 152
 153 static int pv88090_set_current_limit(struct regulator_dev *rdev, int min,
 154                                     int max)
 155 {
 156         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 157         int i;
 158
 159         /* search for closest to maximum */
 160         for (i = info->n_current_limits; i >= 0; i--) {
 161                 if (min <= info->current_limits[i]
 162                         && max >= info->current_limits[i]) {
 163                         return regmap_update_bits(rdev->regmap,
 164                                 info->conf,
 165                                 info->limit_mask,
 166                                 i << PV88090_BUCK1_ILIM_SHIFT);
 167                 }
 168         }
 169
 170         return -EINVAL;
 171 }
 172
 173 static int pv88090_get_current_limit(struct regulator_dev *rdev)
 174 {
 175         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 176         unsigned int data;
 177         int ret;
 178
 179         ret = regmap_read(rdev->regmap, info->conf, &data);
 180         if (ret < 0)
 181                 return ret;
 182
 183         data = (data & info->limit_mask) >> PV88090_BUCK1_ILIM_SHIFT;
 184         return info->current_limits[data];
 185 }
 186
 187 static struct regulator_ops pv88090_buck_ops = {
 188         .get_mode = pv88090_buck_get_mode,
 189         .set_mode = pv88090_buck_set_mode,
 190         .enable = regulator_enable_regmap,
 191         .disable = regulator_disable_regmap,
 192         .is_enabled = regulator_is_enabled_regmap,
 193         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 194         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 195         .list_voltage = regulator_list_voltage_linear,
 196         .set_current_limit = pv88090_set_current_limit,
 197         .get_current_limit = pv88090_get_current_limit,
 198 };
 199
 200 static struct regulator_ops pv88090_ldo_ops = {
 201         .enable = regulator_enable_regmap,
 202         .disable = regulator_disable_regmap,
 203         .is_enabled = regulator_is_enabled_regmap,
 204         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 205         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 206         .list_voltage = regulator_list_voltage_linear,
 207 };
 208
 209 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
 210 {\
 211         .desc   =       {\
 212                 .id = chip##_ID_##regl_name,\
 213                 .name = __stringify(chip##_##regl_name),\
 214                 .of_match = of_match_ptr(#regl_name),\
 215                 .regulators_node = of_match_ptr("regulators"),\
 216                 .type = REGULATOR_VOLTAGE,\
 217                 .owner = THIS_MODULE,\
 218                 .ops = &pv88090_buck_ops,\
 219                 .min_uV = min, \
 220                 .uV_step = step, \
 221                 .n_voltages = ((max) - (min))/(step) + 1, \
 222                 .enable_reg = PV88090_REG_##regl_name##_CONF0, \
 223                 .enable_mask = PV88090_##regl_name##_EN, \
 224                 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \
 225                 .vsel_mask = PV88090_V##regl_name##_MASK, \
 226         },\
 227         .current_limits = limits_array, \
 228         .n_current_limits = ARRAY_SIZE(limits_array), \
 229         .limit_mask = PV88090_##regl_name##_ILIM_MASK, \
 230         .conf = PV88090_REG_##regl_name##_CONF1, \
 231         .conf2 = PV88090_REG_##regl_name##_CONF2, \
 232 }
 233
 234 #define PV88090_LDO(chip, regl_name, min, step, max) \
 235 {\
 236         .desc   =       {\
 237                 .id = chip##_ID_##regl_name,\
 238                 .name = __stringify(chip##_##regl_name),\
 239                 .of_match = of_match_ptr(#regl_name),\
 240                 .regulators_node = of_match_ptr("regulators"),\
 241                 .type = REGULATOR_VOLTAGE,\
 242                 .owner = THIS_MODULE,\
 243                 .ops = &pv88090_ldo_ops,\
 244                 .min_uV = min, \
 245                 .uV_step = step, \
 246                 .n_voltages = ((max) - (min))/(step) + 1, \
 247                 .enable_reg = PV88090_REG_##regl_name##_CONT, \
 248                 .enable_mask = PV88090_##regl_name##_EN, \
 249                 .vsel_reg = PV88090_REG_##regl_name##_CONT, \
 250                 .vsel_mask = PV88090_V##regl_name##_MASK, \
 251         },\
 252 }
 253
 254 static struct pv88090_regulator pv88090_regulator_info[] = {
 255         PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
 256                 pv88090_buck1_limits),
 257         PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
 258                 pv88090_buck23_limits),
 259         PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
 260                 pv88090_buck23_limits),
 261         PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
 262         PV88090_LDO(PV88090, LDO2,  650000, 25000, 2225000),
 263 };
 264
 265 static irqreturn_t pv88090_irq_handler(int irq, void *data)
 266 {
 267         struct pv88090 *chip = data;
 268         int i, reg_val, err, ret = IRQ_NONE;
 269
 270         err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
 271         if (err < 0)
 272                 goto error_i2c;
 273
 274         if (reg_val & PV88090_E_VDD_FLT) {
 275                 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 276                         if (chip->rdev[i] != NULL) {
 277                                 regulator_notifier_call_chain(chip->rdev[i],
 278                                         REGULATOR_EVENT_UNDER_VOLTAGE,
 279                                         NULL);
 280                         }
 281                 }
 282
 283                 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
 284                         PV88090_E_VDD_FLT);
 285                 if (err < 0)
 286                         goto error_i2c;
 287
 288                 ret = IRQ_HANDLED;
 289         }
 290
 291         if (reg_val & PV88090_E_OVER_TEMP) {
 292                 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 293                         if (chip->rdev[i] != NULL) {
 294                                 regulator_notifier_call_chain(chip->rdev[i],
 295                                         REGULATOR_EVENT_OVER_TEMP,
 296                                         NULL);
 297                         }
 298                 }
 299
 300                 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
 301                         PV88090_E_OVER_TEMP);
 302                 if (err < 0)
 303                         goto error_i2c;
 304
 305                 ret = IRQ_HANDLED;
 306         }
 307
 308         return ret;
 309
 310 error_i2c:
 311         dev_err(chip->dev, "I2C error : %d\n", err);
 312         return IRQ_NONE;
 313 }
 314
 315 /*
 316  * I2C driver interface functions
 317  */
 318 static int pv88090_i2c_probe(struct i2c_client *i2c,
 319                 const struct i2c_device_id *id)
 320 {
 321         struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 322         struct pv88090 *chip;
 323         struct regulator_config config = { };
 324         int error, i, ret = 0;
 325         unsigned int conf2, range, index;
 326
 327         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
 328         if (!chip)
 329                 return -ENOMEM;
 330
 331         chip->dev = &i2c->dev;
 332         chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
 333         if (IS_ERR(chip->regmap)) {
 334                 error = PTR_ERR(chip->regmap);
 335                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 336                         error);
 337                 return error;
 338         }
 339
 340         i2c_set_clientdata(i2c, chip);
 341
 342         if (i2c->irq != 0) {
 343                 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
 344                 if (ret < 0) {
 345                         dev_err(chip->dev,
 346                                 "Failed to mask A reg: %d\n", ret);
 347                         return ret;
 348                 }
 349
 350                 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
 351                 if (ret < 0) {
 352                         dev_err(chip->dev,
 353                                 "Failed to mask B reg: %d\n", ret);
 354                         return ret;
 355                 }
 356
 357                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 358                                         pv88090_irq_handler,
 359                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 360                                         "pv88090", chip);
 361                 if (ret != 0) {
 362                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 363                                 i2c->irq);
 364                         return ret;
 365                 }
 366
 367                 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
 368                         PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
 369                 if (ret < 0) {
 370                         dev_err(chip->dev,
 371                                 "Failed to update mask reg: %d\n", ret);
 372                         return ret;
 373                 }
 374
 375         } else {
 376                 dev_warn(chip->dev, "No IRQ configured\n");
 377         }
 378
 379         config.dev = chip->dev;
 380         config.regmap = chip->regmap;
 381
 382         for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 383                 if (init_data)
 384                         config.init_data = &init_data[i];
 385
 386                 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
 387                         ret = regmap_read(chip->regmap,
 388                                 pv88090_regulator_info[i].conf2, &conf2);
 389                         if (ret < 0)
 390                                 return ret;
 391
 392                         conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
 393                                 PV88090_BUCK_VDAC_RANGE_MASK;
 394
 395                         ret = regmap_read(chip->regmap,
 396                                 PV88090_REG_BUCK_FOLD_RANGE, &range);
 397                         if (ret < 0)
 398                                 return ret;
 399
 400                         range = (range >>
 401                                  (PV88080_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
 402                                 PV88080_BUCK_VRANGE_GAIN_MASK;
 403                         index = ((range << 1) | conf2);
 404
 405                         pv88090_regulator_info[i].desc.min_uV
 406                                 = pv88090_buck_vol[index].min_uV;
 407                         pv88090_regulator_info[i].desc.uV_step
 408                                 = pv88090_buck_vol[index].uV_step;
 409                         pv88090_regulator_info[i].desc.n_voltages
 410                                 = ((pv88090_buck_vol[index].max_uV)
 411                                 - (pv88090_buck_vol[index].min_uV))
 412                                 /(pv88090_buck_vol[index].uV_step) + 1;
 413                 }
 414
 415                 config.driver_data = (void *)&pv88090_regulator_info[i];
 416                 chip->rdev[i] = devm_regulator_register(chip->dev,
 417                         &pv88090_regulator_info[i].desc, &config);
 418                 if (IS_ERR(chip->rdev[i])) {
 419                         dev_err(chip->dev,
 420                                 "Failed to register PV88090 regulator\n");
 421                         return PTR_ERR(chip->rdev[i]);
 422                 }
 423         }
 424
 425         return 0;
 426 }
 427
 428 static const struct i2c_device_id pv88090_i2c_id[] = {
 429         {"pv88090", 0},
 430         {},
 431 };
 432 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
 433
 434 #ifdef CONFIG_OF
 435 static const struct of_device_id pv88090_dt_ids[] = {
 436         { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
 437         {},
 438 };
 439 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
 440 #endif
 441
 442 static struct i2c_driver pv88090_regulator_driver = {
 443         .driver = {
 444                 .name = "pv88090",
 445                 .of_match_table = of_match_ptr(pv88090_dt_ids),
 446         },
 447         .probe = pv88090_i2c_probe,
 448         .id_table = pv88090_i2c_id,
 449 };
 450
 451 module_i2c_driver(pv88090_regulator_driver);
 452
 453 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 454 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
 455 MODULE_LICENSE("GPL");