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/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 "pv88090-regulator.h"
  31
  32 #define PV88090_MAX_REGULATORS  5
  33
  34 /* PV88090 REGULATOR IDs */
  35 enum {
  36         /* BUCKs */
  37         PV88090_ID_BUCK1,
  38         PV88090_ID_BUCK2,
  39         PV88090_ID_BUCK3,
  40
  41         /* LDOs */
  42         PV88090_ID_LDO1,
  43         PV88090_ID_LDO2,
  44 };
  45
  46 struct pv88090_regulator {
  47         struct regulator_desc desc;
  48         /* Current limiting */
  49         unsigned        n_current_limits;
  50         const int       *current_limits;
  51         unsigned int limit_mask;
  52         unsigned int conf;
  53         unsigned int conf2;
  54 };
  55
  56 struct pv88090 {
  57         struct device *dev;
  58         struct regmap *regmap;
  59         struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
  60 };
  61
  62 struct pv88090_buck_voltage {
  63         int min_uV;
  64         int max_uV;
  65         int uV_step;
  66 };
  67
  68 static const struct regmap_config pv88090_regmap_config = {
  69         .reg_bits = 8,
  70         .val_bits = 8,
  71 };
  72
  73 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
  74  *  Entry indexes corresponds to register values.
  75  */
  76
  77 static const int pv88090_buck1_limits[] = {
  78          220000,  440000,  660000,  880000, 1100000, 1320000, 1540000, 1760000,
  79         1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
  80         3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
  81         5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
  82 };
  83
  84 static const int pv88090_buck23_limits[] = {
  85         1496000, 2393000, 3291000, 4189000
  86 };
  87
  88 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
  89         {
  90                 .min_uV = 600000,
  91                 .max_uV = 1393750,
  92                 .uV_step = 6250,
  93         },
  94
  95         {
  96                 .min_uV = 1400000,
  97                 .max_uV = 2193750,
  98                 .uV_step = 6250,
  99         },
 100         {
 101                 .min_uV = 1250000,
 102                 .max_uV = 2837500,
 103                 .uV_step = 12500,
 104         },
 105 };
 106
 107 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
 108 {
 109         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 110         unsigned int data;
 111         int ret, mode = 0;
 112
 113         ret = regmap_read(rdev->regmap, info->conf, &data);
 114         if (ret < 0)
 115                 return ret;
 116
 117         switch (data & PV88090_BUCK1_MODE_MASK) {
 118         case PV88090_BUCK_MODE_SYNC:
 119                 mode = REGULATOR_MODE_FAST;
 120                 break;
 121         case PV88090_BUCK_MODE_AUTO:
 122                 mode = REGULATOR_MODE_NORMAL;
 123                 break;
 124         case PV88090_BUCK_MODE_SLEEP:
 125                 mode = REGULATOR_MODE_STANDBY;
 126                 break;
 127         }
 128
 129         return mode;
 130 }
 131
 132 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
 133                                         unsigned int mode)
 134 {
 135         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 136         int val = 0;
 137
 138         switch (mode) {
 139         case REGULATOR_MODE_FAST:
 140                 val = PV88090_BUCK_MODE_SYNC;
 141                 break;
 142         case REGULATOR_MODE_NORMAL:
 143                 val = PV88090_BUCK_MODE_AUTO;
 144                 break;
 145         case REGULATOR_MODE_STANDBY:
 146                 val = PV88090_BUCK_MODE_SLEEP;
 147                 break;
 148         default:
 149                 return -EINVAL;
 150         }
 151
 152         return regmap_update_bits(rdev->regmap, info->conf,
 153                                         PV88090_BUCK1_MODE_MASK, val);
 154 }
 155
 156 static int pv88090_set_current_limit(struct regulator_dev *rdev, int min,
 157                                     int max)
 158 {
 159         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 160         int i;
 161
 162         /* search for closest to maximum */
 163         for (i = info->n_current_limits; i >= 0; i--) {
 164                 if (min <= info->current_limits[i]
 165                         && max >= info->current_limits[i]) {
 166                         return regmap_update_bits(rdev->regmap,
 167                                 info->conf,
 168                                 info->limit_mask,
 169                                 i << PV88090_BUCK1_ILIM_SHIFT);
 170                 }
 171         }
 172
 173         return -EINVAL;
 174 }
 175
 176 static int pv88090_get_current_limit(struct regulator_dev *rdev)
 177 {
 178         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 179         unsigned int data;
 180         int ret;
 181
 182         ret = regmap_read(rdev->regmap, info->conf, &data);
 183         if (ret < 0)
 184                 return ret;
 185
 186         data = (data & info->limit_mask) >> PV88090_BUCK1_ILIM_SHIFT;
 187         return info->current_limits[data];
 188 }
 189
 190 static struct regulator_ops pv88090_buck_ops = {
 191         .get_mode = pv88090_buck_get_mode,
 192         .set_mode = pv88090_buck_set_mode,
 193         .enable = regulator_enable_regmap,
 194         .disable = regulator_disable_regmap,
 195         .is_enabled = regulator_is_enabled_regmap,
 196         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 197         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 198         .list_voltage = regulator_list_voltage_linear,
 199         .set_current_limit = pv88090_set_current_limit,
 200         .get_current_limit = pv88090_get_current_limit,
 201 };
 202
 203 static struct regulator_ops pv88090_ldo_ops = {
 204         .enable = regulator_enable_regmap,
 205         .disable = regulator_disable_regmap,
 206         .is_enabled = regulator_is_enabled_regmap,
 207         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 208         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 209         .list_voltage = regulator_list_voltage_linear,
 210 };
 211
 212 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
 213 {\
 214         .desc   =       {\
 215                 .id = chip##_ID_##regl_name,\
 216                 .name = __stringify(chip##_##regl_name),\
 217                 .of_match = of_match_ptr(#regl_name),\
 218                 .regulators_node = of_match_ptr("regulators"),\
 219                 .type = REGULATOR_VOLTAGE,\
 220                 .owner = THIS_MODULE,\
 221                 .ops = &pv88090_buck_ops,\
 222                 .min_uV = min, \
 223                 .uV_step = step, \
 224                 .n_voltages = ((max) - (min))/(step) + 1, \
 225                 .enable_reg = PV88090_REG_##regl_name##_CONF0, \
 226                 .enable_mask = PV88090_##regl_name##_EN, \
 227                 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \
 228                 .vsel_mask = PV88090_V##regl_name##_MASK, \
 229         },\
 230         .current_limits = limits_array, \
 231         .n_current_limits = ARRAY_SIZE(limits_array), \
 232         .limit_mask = PV88090_##regl_name##_ILIM_MASK, \
 233         .conf = PV88090_REG_##regl_name##_CONF1, \
 234         .conf2 = PV88090_REG_##regl_name##_CONF2, \
 235 }
 236
 237 #define PV88090_LDO(chip, regl_name, min, step, max) \
 238 {\
 239         .desc   =       {\
 240                 .id = chip##_ID_##regl_name,\
 241                 .name = __stringify(chip##_##regl_name),\
 242                 .of_match = of_match_ptr(#regl_name),\
 243                 .regulators_node = of_match_ptr("regulators"),\
 244                 .type = REGULATOR_VOLTAGE,\
 245                 .owner = THIS_MODULE,\
 246                 .ops = &pv88090_ldo_ops,\
 247                 .min_uV = min, \
 248                 .uV_step = step, \
 249                 .n_voltages = ((max) - (min))/(step) + 1, \
 250                 .enable_reg = PV88090_REG_##regl_name##_CONT, \
 251                 .enable_mask = PV88090_##regl_name##_EN, \
 252                 .vsel_reg = PV88090_REG_##regl_name##_CONT, \
 253                 .vsel_mask = PV88090_V##regl_name##_MASK, \
 254         },\
 255 }
 256
 257 static struct pv88090_regulator pv88090_regulator_info[] = {
 258         PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
 259                 pv88090_buck1_limits),
 260         PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
 261                 pv88090_buck23_limits),
 262         PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
 263                 pv88090_buck23_limits),
 264         PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
 265         PV88090_LDO(PV88090, LDO2,  650000, 25000, 2225000),
 266 };
 267
 268 static irqreturn_t pv88090_irq_handler(int irq, void *data)
 269 {
 270         struct pv88090 *chip = data;
 271         int i, reg_val, err, ret = IRQ_NONE;
 272
 273         err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
 274         if (err < 0)
 275                 goto error_i2c;
 276
 277         if (reg_val & PV88090_E_VDD_FLT) {
 278                 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 279                         if (chip->rdev[i] != NULL) {
 280                                 regulator_notifier_call_chain(chip->rdev[i],
 281                                         REGULATOR_EVENT_UNDER_VOLTAGE,
 282                                         NULL);
 283                         }
 284                 }
 285
 286                 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
 287                         PV88090_E_VDD_FLT);
 288                 if (err < 0)
 289                         goto error_i2c;
 290
 291                 ret = IRQ_HANDLED;
 292         }
 293
 294         if (reg_val & PV88090_E_OVER_TEMP) {
 295                 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 296                         if (chip->rdev[i] != NULL) {
 297                                 regulator_notifier_call_chain(chip->rdev[i],
 298                                         REGULATOR_EVENT_OVER_TEMP,
 299                                         NULL);
 300                         }
 301                 }
 302
 303                 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
 304                         PV88090_E_OVER_TEMP);
 305                 if (err < 0)
 306                         goto error_i2c;
 307
 308                 ret = IRQ_HANDLED;
 309         }
 310
 311         return ret;
 312
 313 error_i2c:
 314         dev_err(chip->dev, "I2C error : %d\n", err);
 315         return IRQ_NONE;
 316 }
 317
 318 /*
 319  * I2C driver interface functions
 320  */
 321 static int pv88090_i2c_probe(struct i2c_client *i2c,
 322                 const struct i2c_device_id *id)
 323 {
 324         struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 325         struct pv88090 *chip;
 326         struct regulator_config config = { };
 327         int error, i, ret = 0;
 328         unsigned int conf2, range, index;
 329
 330         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
 331         if (!chip)
 332                 return -ENOMEM;
 333
 334         chip->dev = &i2c->dev;
 335         chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
 336         if (IS_ERR(chip->regmap)) {
 337                 error = PTR_ERR(chip->regmap);
 338                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 339                         error);
 340                 return error;
 341         }
 342
 343         i2c_set_clientdata(i2c, chip);
 344
 345         if (i2c->irq != 0) {
 346                 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
 347                 if (ret < 0) {
 348                         dev_err(chip->dev,
 349                                 "Failed to mask A reg: %d\n", ret);
 350                         return ret;
 351                 }
 352
 353                 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
 354                 if (ret < 0) {
 355                         dev_err(chip->dev,
 356                                 "Failed to mask B reg: %d\n", ret);
 357                         return ret;
 358                 }
 359
 360                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 361                                         pv88090_irq_handler,
 362                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 363                                         "pv88090", chip);
 364                 if (ret != 0) {
 365                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 366                                 i2c->irq);
 367                         return ret;
 368                 }
 369
 370                 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
 371                         PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
 372                 if (ret < 0) {
 373                         dev_err(chip->dev,
 374                                 "Failed to update mask reg: %d\n", ret);
 375                         return ret;
 376                 }
 377
 378         } else {
 379                 dev_warn(chip->dev, "No IRQ configured\n");
 380         }
 381
 382         config.dev = chip->dev;
 383         config.regmap = chip->regmap;
 384
 385         for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 386                 if (init_data)
 387                         config.init_data = &init_data[i];
 388
 389                 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
 390                         ret = regmap_read(chip->regmap,
 391                                 pv88090_regulator_info[i].conf2, &conf2);
 392                         if (ret < 0)
 393                                 return ret;
 394
 395                         conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
 396                                 PV88090_BUCK_VDAC_RANGE_MASK;
 397
 398                         ret = regmap_read(chip->regmap,
 399                                 PV88090_REG_BUCK_FOLD_RANGE, &range);
 400                         if (ret < 0)
 401                                 return ret;
 402
 403                         range = (range >>
 404                                  (PV88080_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
 405                                 PV88080_BUCK_VRANGE_GAIN_MASK;
 406                         index = ((range << 1) | conf2);
 407
 408                         pv88090_regulator_info[i].desc.min_uV
 409                                 = pv88090_buck_vol[index].min_uV;
 410                         pv88090_regulator_info[i].desc.uV_step
 411                                 = pv88090_buck_vol[index].uV_step;
 412                         pv88090_regulator_info[i].desc.n_voltages
 413                                 = ((pv88090_buck_vol[index].max_uV)
 414                                 - (pv88090_buck_vol[index].min_uV))
 415                                 /(pv88090_buck_vol[index].uV_step) + 1;
 416                 }
 417
 418                 config.driver_data = (void *)&pv88090_regulator_info[i];
 419                 chip->rdev[i] = devm_regulator_register(chip->dev,
 420                         &pv88090_regulator_info[i].desc, &config);
 421                 if (IS_ERR(chip->rdev[i])) {
 422                         dev_err(chip->dev,
 423                                 "Failed to register PV88090 regulator\n");
 424                         return PTR_ERR(chip->rdev[i]);
 425                 }
 426         }
 427
 428         return 0;
 429 }
 430
 431 static const struct i2c_device_id pv88090_i2c_id[] = {
 432         {"pv88090", 0},
 433         {},
 434 };
 435 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
 436
 437 #ifdef CONFIG_OF
 438 static const struct of_device_id pv88090_dt_ids[] = {
 439         { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
 440         {},
 441 };
 442 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
 443 #endif
 444
 445 static struct i2c_driver pv88090_regulator_driver = {
 446         .driver = {
 447                 .name = "pv88090",
 448                 .of_match_table = of_match_ptr(pv88090_dt_ids),
 449         },
 450         .probe = pv88090_i2c_probe,
 451         .id_table = pv88090_i2c_id,
 452 };
 453
 454 module_i2c_driver(pv88090_regulator_driver);
 455
 456 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 457 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
 458 MODULE_LICENSE("GPL");