drivers/regulator/pv88090-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // pv88090-regulator.c - Regulator device driver for PV88090
   4 // Copyright (C) 2015  Powerventure Semiconductor Ltd.
   5
   6 #include <linux/err.h>
   7 #include <linux/i2c.h>
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/slab.h>
  11 #include <linux/regulator/driver.h>
  12 #include <linux/regulator/machine.h>
  13 #include <linux/regmap.h>
  14 #include <linux/irq.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/regulator/of_regulator.h>
  17 #include "pv88090-regulator.h"
  18
  19 #define PV88090_MAX_REGULATORS  5
  20
  21 /* PV88090 REGULATOR IDs */
  22 enum {
  23         /* BUCKs */
  24         PV88090_ID_BUCK1,
  25         PV88090_ID_BUCK2,
  26         PV88090_ID_BUCK3,
  27
  28         /* LDOs */
  29         PV88090_ID_LDO1,
  30         PV88090_ID_LDO2,
  31 };
  32
  33 struct pv88090_regulator {
  34         struct regulator_desc desc;
  35         unsigned int conf;
  36         unsigned int conf2;
  37 };
  38
  39 struct pv88090 {
  40         struct device *dev;
  41         struct regmap *regmap;
  42         struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
  43 };
  44
  45 struct pv88090_buck_voltage {
  46         int min_uV;
  47         int max_uV;
  48         int uV_step;
  49 };
  50
  51 static const struct regmap_config pv88090_regmap_config = {
  52         .reg_bits = 8,
  53         .val_bits = 8,
  54 };
  55
  56 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
  57  *  Entry indexes corresponds to register values.
  58  */
  59
  60 static const unsigned int pv88090_buck1_limits[] = {
  61          220000,  440000,  660000,  880000, 1100000, 1320000, 1540000, 1760000,
  62         1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
  63         3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
  64         5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
  65 };
  66
  67 static const unsigned int pv88090_buck23_limits[] = {
  68         1496000, 2393000, 3291000, 4189000
  69 };
  70
  71 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
  72         {
  73                 .min_uV = 600000,
  74                 .max_uV = 1393750,
  75                 .uV_step = 6250,
  76         },
  77
  78         {
  79                 .min_uV = 1400000,
  80                 .max_uV = 2193750,
  81                 .uV_step = 6250,
  82         },
  83         {
  84                 .min_uV = 1250000,
  85                 .max_uV = 2837500,
  86                 .uV_step = 12500,
  87         },
  88 };
  89
  90 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
  91 {
  92         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
  93         unsigned int data;
  94         int ret, mode = 0;
  95
  96         ret = regmap_read(rdev->regmap, info->conf, &data);
  97         if (ret < 0)
  98                 return ret;
  99
 100         switch (data & PV88090_BUCK1_MODE_MASK) {
 101         case PV88090_BUCK_MODE_SYNC:
 102                 mode = REGULATOR_MODE_FAST;
 103                 break;
 104         case PV88090_BUCK_MODE_AUTO:
 105                 mode = REGULATOR_MODE_NORMAL;
 106                 break;
 107         case PV88090_BUCK_MODE_SLEEP:
 108                 mode = REGULATOR_MODE_STANDBY;
 109                 break;
 110         }
 111
 112         return mode;
 113 }
 114
 115 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
 116                                         unsigned int mode)
 117 {
 118         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 119         int val = 0;
 120
 121         switch (mode) {
 122         case REGULATOR_MODE_FAST:
 123                 val = PV88090_BUCK_MODE_SYNC;
 124                 break;
 125         case REGULATOR_MODE_NORMAL:
 126                 val = PV88090_BUCK_MODE_AUTO;
 127                 break;
 128         case REGULATOR_MODE_STANDBY:
 129                 val = PV88090_BUCK_MODE_SLEEP;
 130                 break;
 131         default:
 132                 return -EINVAL;
 133         }
 134
 135         return regmap_update_bits(rdev->regmap, info->conf,
 136                                         PV88090_BUCK1_MODE_MASK, val);
 137 }
 138
 139 static const struct regulator_ops pv88090_buck_ops = {
 140         .get_mode = pv88090_buck_get_mode,
 141         .set_mode = pv88090_buck_set_mode,
 142         .enable = regulator_enable_regmap,
 143         .disable = regulator_disable_regmap,
 144         .is_enabled = regulator_is_enabled_regmap,
 145         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 146         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 147         .list_voltage = regulator_list_voltage_linear,
 148         .set_current_limit = regulator_set_current_limit_regmap,
 149         .get_current_limit = regulator_get_current_limit_regmap,
 150 };
 151
 152 static const struct regulator_ops pv88090_ldo_ops = {
 153         .enable = regulator_enable_regmap,
 154         .disable = regulator_disable_regmap,
 155         .is_enabled = regulator_is_enabled_regmap,
 156         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 157         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 158         .list_voltage = regulator_list_voltage_linear,
 159 };
 160
 161 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
 162 {\
 163         .desc   =       {\
 164                 .id = chip##_ID_##regl_name,\
 165                 .name = __stringify(chip##_##regl_name),\
 166                 .of_match = of_match_ptr(#regl_name),\
 167                 .regulators_node = of_match_ptr("regulators"),\
 168                 .type = REGULATOR_VOLTAGE,\
 169                 .owner = THIS_MODULE,\
 170                 .ops = &pv88090_buck_ops,\
 171                 .min_uV = min, \
 172                 .uV_step = step, \
 173                 .n_voltages = ((max) - (min))/(step) + 1, \
 174                 .enable_reg = PV88090_REG_##regl_name##_CONF0, \
 175                 .enable_mask = PV88090_##regl_name##_EN, \
 176                 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \
 177                 .vsel_mask = PV88090_V##regl_name##_MASK, \
 178                 .curr_table = limits_array, \
 179                 .n_current_limits = ARRAY_SIZE(limits_array), \
 180                 .csel_reg = PV88090_REG_##regl_name##_CONF1, \
 181                 .csel_mask = PV88090_##regl_name##_ILIM_MASK, \
 182         },\
 183         .conf = PV88090_REG_##regl_name##_CONF1, \
 184         .conf2 = PV88090_REG_##regl_name##_CONF2, \
 185 }
 186
 187 #define PV88090_LDO(chip, regl_name, min, step, max) \
 188 {\
 189         .desc   =       {\
 190                 .id = chip##_ID_##regl_name,\
 191                 .name = __stringify(chip##_##regl_name),\
 192                 .of_match = of_match_ptr(#regl_name),\
 193                 .regulators_node = of_match_ptr("regulators"),\
 194                 .type = REGULATOR_VOLTAGE,\
 195                 .owner = THIS_MODULE,\
 196                 .ops = &pv88090_ldo_ops,\
 197                 .min_uV = min, \
 198                 .uV_step = step, \
 199                 .n_voltages = ((max) - (min))/(step) + 1, \
 200                 .enable_reg = PV88090_REG_##regl_name##_CONT, \
 201                 .enable_mask = PV88090_##regl_name##_EN, \
 202                 .vsel_reg = PV88090_REG_##regl_name##_CONT, \
 203                 .vsel_mask = PV88090_V##regl_name##_MASK, \
 204         },\
 205 }
 206
 207 static struct pv88090_regulator pv88090_regulator_info[] = {
 208         PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
 209                 pv88090_buck1_limits),
 210         PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
 211                 pv88090_buck23_limits),
 212         PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
 213                 pv88090_buck23_limits),
 214         PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
 215         PV88090_LDO(PV88090, LDO2,  650000, 25000, 2225000),
 216 };
 217
 218 static irqreturn_t pv88090_irq_handler(int irq, void *data)
 219 {
 220         struct pv88090 *chip = data;
 221         int i, reg_val, err, ret = IRQ_NONE;
 222
 223         err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
 224         if (err < 0)
 225                 goto error_i2c;
 226
 227         if (reg_val & PV88090_E_VDD_FLT) {
 228                 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 229                         if (chip->rdev[i] != NULL) {
 230                                 regulator_lock(chip->rdev[i]);
 231                                 regulator_notifier_call_chain(chip->rdev[i],
 232                                         REGULATOR_EVENT_UNDER_VOLTAGE,
 233                                         NULL);
 234                                 regulator_unlock(chip->rdev[i]);
 235                         }
 236                 }
 237
 238                 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
 239                         PV88090_E_VDD_FLT);
 240                 if (err < 0)
 241                         goto error_i2c;
 242
 243                 ret = IRQ_HANDLED;
 244         }
 245
 246         if (reg_val & PV88090_E_OVER_TEMP) {
 247                 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 248                         if (chip->rdev[i] != NULL) {
 249                                 regulator_lock(chip->rdev[i]);
 250                                 regulator_notifier_call_chain(chip->rdev[i],
 251                                         REGULATOR_EVENT_OVER_TEMP,
 252                                         NULL);
 253                                 regulator_unlock(chip->rdev[i]);
 254                         }
 255                 }
 256
 257                 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
 258                         PV88090_E_OVER_TEMP);
 259                 if (err < 0)
 260                         goto error_i2c;
 261
 262                 ret = IRQ_HANDLED;
 263         }
 264
 265         return ret;
 266
 267 error_i2c:
 268         dev_err(chip->dev, "I2C error : %d\n", err);
 269         return IRQ_NONE;
 270 }
 271
 272 /*
 273  * I2C driver interface functions
 274  */
 275 static int pv88090_i2c_probe(struct i2c_client *i2c)
 276 {
 277         struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 278         struct pv88090 *chip;
 279         struct regulator_config config = { };
 280         int error, i, ret = 0;
 281         unsigned int conf2, range, index;
 282
 283         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
 284         if (!chip)
 285                 return -ENOMEM;
 286
 287         chip->dev = &i2c->dev;
 288         chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
 289         if (IS_ERR(chip->regmap)) {
 290                 error = PTR_ERR(chip->regmap);
 291                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 292                         error);
 293                 return error;
 294         }
 295
 296         i2c_set_clientdata(i2c, chip);
 297
 298         if (i2c->irq != 0) {
 299                 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
 300                 if (ret < 0) {
 301                         dev_err(chip->dev,
 302                                 "Failed to mask A reg: %d\n", ret);
 303                         return ret;
 304                 }
 305
 306                 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
 307                 if (ret < 0) {
 308                         dev_err(chip->dev,
 309                                 "Failed to mask B reg: %d\n", ret);
 310                         return ret;
 311                 }
 312
 313                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 314                                         pv88090_irq_handler,
 315                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 316                                         "pv88090", chip);
 317                 if (ret != 0) {
 318                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 319                                 i2c->irq);
 320                         return ret;
 321                 }
 322
 323                 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
 324                         PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
 325                 if (ret < 0) {
 326                         dev_err(chip->dev,
 327                                 "Failed to update mask reg: %d\n", ret);
 328                         return ret;
 329                 }
 330
 331         } else {
 332                 dev_warn(chip->dev, "No IRQ configured\n");
 333         }
 334
 335         config.dev = chip->dev;
 336         config.regmap = chip->regmap;
 337
 338         for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 339                 if (init_data)
 340                         config.init_data = &init_data[i];
 341
 342                 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
 343                         ret = regmap_read(chip->regmap,
 344                                 pv88090_regulator_info[i].conf2, &conf2);
 345                         if (ret < 0)
 346                                 return ret;
 347
 348                         conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
 349                                 PV88090_BUCK_VDAC_RANGE_MASK;
 350
 351                         ret = regmap_read(chip->regmap,
 352                                 PV88090_REG_BUCK_FOLD_RANGE, &range);
 353                         if (ret < 0)
 354                                 return ret;
 355
 356                         range = (range >>
 357                                  (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
 358                                 PV88090_BUCK_VRANGE_GAIN_MASK;
 359                         index = ((range << 1) | conf2);
 360                         if (index > PV88090_ID_BUCK3) {
 361                                 dev_err(chip->dev,
 362                                         "Invalid index(%d)\n", index);
 363                                 return -EINVAL;
 364                         }
 365
 366                         pv88090_regulator_info[i].desc.min_uV
 367                                 = pv88090_buck_vol[index].min_uV;
 368                         pv88090_regulator_info[i].desc.uV_step
 369                                 = pv88090_buck_vol[index].uV_step;
 370                         pv88090_regulator_info[i].desc.n_voltages
 371                                 = ((pv88090_buck_vol[index].max_uV)
 372                                 - (pv88090_buck_vol[index].min_uV))
 373                                 /(pv88090_buck_vol[index].uV_step) + 1;
 374                 }
 375
 376                 config.driver_data = (void *)&pv88090_regulator_info[i];
 377                 chip->rdev[i] = devm_regulator_register(chip->dev,
 378                         &pv88090_regulator_info[i].desc, &config);
 379                 if (IS_ERR(chip->rdev[i])) {
 380                         dev_err(chip->dev,
 381                                 "Failed to register PV88090 regulator\n");
 382                         return PTR_ERR(chip->rdev[i]);
 383                 }
 384         }
 385
 386         return 0;
 387 }
 388
 389 static const struct i2c_device_id pv88090_i2c_id[] = {
 390         {"pv88090", 0},
 391         {},
 392 };
 393 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
 394
 395 #ifdef CONFIG_OF
 396 static const struct of_device_id pv88090_dt_ids[] = {
 397         { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
 398         {},
 399 };
 400 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
 401 #endif
 402
 403 static struct i2c_driver pv88090_regulator_driver = {
 404         .driver = {
 405                 .name = "pv88090",
 406                 .of_match_table = of_match_ptr(pv88090_dt_ids),
 407         },
 408         .probe_new = pv88090_i2c_probe,
 409         .id_table = pv88090_i2c_id,
 410 };
 411
 412 module_i2c_driver(pv88090_regulator_driver);
 413
 414 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 415 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
 416 MODULE_LICENSE("GPL");