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         unsigned int conf;
  46         unsigned int conf2;
  47 };
  48
  49 struct pv88090 {
  50         struct device *dev;
  51         struct regmap *regmap;
  52         struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
  53 };
  54
  55 struct pv88090_buck_voltage {
  56         int min_uV;
  57         int max_uV;
  58         int uV_step;
  59 };
  60
  61 static const struct regmap_config pv88090_regmap_config = {
  62         .reg_bits = 8,
  63         .val_bits = 8,
  64 };
  65
  66 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
  67  *  Entry indexes corresponds to register values.
  68  */
  69
  70 static const unsigned int pv88090_buck1_limits[] = {
  71          220000,  440000,  660000,  880000, 1100000, 1320000, 1540000, 1760000,
  72         1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
  73         3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
  74         5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
  75 };
  76
  77 static const unsigned int pv88090_buck23_limits[] = {
  78         1496000, 2393000, 3291000, 4189000
  79 };
  80
  81 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
  82         {
  83                 .min_uV = 600000,
  84                 .max_uV = 1393750,
  85                 .uV_step = 6250,
  86         },
  87
  88         {
  89                 .min_uV = 1400000,
  90                 .max_uV = 2193750,
  91                 .uV_step = 6250,
  92         },
  93         {
  94                 .min_uV = 1250000,
  95                 .max_uV = 2837500,
  96                 .uV_step = 12500,
  97         },
  98 };
  99
 100 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
 101 {
 102         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 103         unsigned int data;
 104         int ret, mode = 0;
 105
 106         ret = regmap_read(rdev->regmap, info->conf, &data);
 107         if (ret < 0)
 108                 return ret;
 109
 110         switch (data & PV88090_BUCK1_MODE_MASK) {
 111         case PV88090_BUCK_MODE_SYNC:
 112                 mode = REGULATOR_MODE_FAST;
 113                 break;
 114         case PV88090_BUCK_MODE_AUTO:
 115                 mode = REGULATOR_MODE_NORMAL;
 116                 break;
 117         case PV88090_BUCK_MODE_SLEEP:
 118                 mode = REGULATOR_MODE_STANDBY;
 119                 break;
 120         }
 121
 122         return mode;
 123 }
 124
 125 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
 126                                         unsigned int mode)
 127 {
 128         struct pv88090_regulator *info = rdev_get_drvdata(rdev);
 129         int val = 0;
 130
 131         switch (mode) {
 132         case REGULATOR_MODE_FAST:
 133                 val = PV88090_BUCK_MODE_SYNC;
 134                 break;
 135         case REGULATOR_MODE_NORMAL:
 136                 val = PV88090_BUCK_MODE_AUTO;
 137                 break;
 138         case REGULATOR_MODE_STANDBY:
 139                 val = PV88090_BUCK_MODE_SLEEP;
 140                 break;
 141         default:
 142                 return -EINVAL;
 143         }
 144
 145         return regmap_update_bits(rdev->regmap, info->conf,
 146                                         PV88090_BUCK1_MODE_MASK, val);
 147 }
 148
 149 static const struct regulator_ops pv88090_buck_ops = {
 150         .get_mode = pv88090_buck_get_mode,
 151         .set_mode = pv88090_buck_set_mode,
 152         .enable = regulator_enable_regmap,
 153         .disable = regulator_disable_regmap,
 154         .is_enabled = regulator_is_enabled_regmap,
 155         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 156         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 157         .list_voltage = regulator_list_voltage_linear,
 158         .set_current_limit = regulator_set_current_limit_regmap,
 159         .get_current_limit = regulator_get_current_limit_regmap,
 160 };
 161
 162 static const struct regulator_ops pv88090_ldo_ops = {
 163         .enable = regulator_enable_regmap,
 164         .disable = regulator_disable_regmap,
 165         .is_enabled = regulator_is_enabled_regmap,
 166         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 167         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 168         .list_voltage = regulator_list_voltage_linear,
 169 };
 170
 171 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
 172 {\
 173         .desc   =       {\
 174                 .id = chip##_ID_##regl_name,\
 175                 .name = __stringify(chip##_##regl_name),\
 176                 .of_match = of_match_ptr(#regl_name),\
 177                 .regulators_node = of_match_ptr("regulators"),\
 178                 .type = REGULATOR_VOLTAGE,\
 179                 .owner = THIS_MODULE,\
 180                 .ops = &pv88090_buck_ops,\
 181                 .min_uV = min, \
 182                 .uV_step = step, \
 183                 .n_voltages = ((max) - (min))/(step) + 1, \
 184                 .enable_reg = PV88090_REG_##regl_name##_CONF0, \
 185                 .enable_mask = PV88090_##regl_name##_EN, \
 186                 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \
 187                 .vsel_mask = PV88090_V##regl_name##_MASK, \
 188                 .curr_table = limits_array, \
 189                 .n_current_limits = ARRAY_SIZE(limits_array), \
 190                 .csel_reg = PV88090_REG_##regl_name##_CONF1, \
 191                 .csel_mask = PV88090_##regl_name##_ILIM_MASK, \
 192         },\
 193         .conf = PV88090_REG_##regl_name##_CONF1, \
 194         .conf2 = PV88090_REG_##regl_name##_CONF2, \
 195 }
 196
 197 #define PV88090_LDO(chip, regl_name, min, step, max) \
 198 {\
 199         .desc   =       {\
 200                 .id = chip##_ID_##regl_name,\
 201                 .name = __stringify(chip##_##regl_name),\
 202                 .of_match = of_match_ptr(#regl_name),\
 203                 .regulators_node = of_match_ptr("regulators"),\
 204                 .type = REGULATOR_VOLTAGE,\
 205                 .owner = THIS_MODULE,\
 206                 .ops = &pv88090_ldo_ops,\
 207                 .min_uV = min, \
 208                 .uV_step = step, \
 209                 .n_voltages = ((max) - (min))/(step) + 1, \
 210                 .enable_reg = PV88090_REG_##regl_name##_CONT, \
 211                 .enable_mask = PV88090_##regl_name##_EN, \
 212                 .vsel_reg = PV88090_REG_##regl_name##_CONT, \
 213                 .vsel_mask = PV88090_V##regl_name##_MASK, \
 214         },\
 215 }
 216
 217 static struct pv88090_regulator pv88090_regulator_info[] = {
 218         PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
 219                 pv88090_buck1_limits),
 220         PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
 221                 pv88090_buck23_limits),
 222         PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
 223                 pv88090_buck23_limits),
 224         PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
 225         PV88090_LDO(PV88090, LDO2,  650000, 25000, 2225000),
 226 };
 227
 228 static irqreturn_t pv88090_irq_handler(int irq, void *data)
 229 {
 230         struct pv88090 *chip = data;
 231         int i, reg_val, err, ret = IRQ_NONE;
 232
 233         err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
 234         if (err < 0)
 235                 goto error_i2c;
 236
 237         if (reg_val & PV88090_E_VDD_FLT) {
 238                 for (i = 0; i < PV88090_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, PV88090_REG_EVENT_A,
 247                         PV88090_E_VDD_FLT);
 248                 if (err < 0)
 249                         goto error_i2c;
 250
 251                 ret = IRQ_HANDLED;
 252         }
 253
 254         if (reg_val & PV88090_E_OVER_TEMP) {
 255                 for (i = 0; i < PV88090_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, PV88090_REG_EVENT_A,
 264                         PV88090_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 pv88090_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 pv88090 *chip;
 286         struct regulator_config config = { };
 287         int error, i, ret = 0;
 288         unsigned int conf2, range, index;
 289
 290         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
 291         if (!chip)
 292                 return -ENOMEM;
 293
 294         chip->dev = &i2c->dev;
 295         chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_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, PV88090_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
 313                 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
 314                 if (ret < 0) {
 315                         dev_err(chip->dev,
 316                                 "Failed to mask B reg: %d\n", ret);
 317                         return ret;
 318                 }
 319
 320                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 321                                         pv88090_irq_handler,
 322                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 323                                         "pv88090", chip);
 324                 if (ret != 0) {
 325                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 326                                 i2c->irq);
 327                         return ret;
 328                 }
 329
 330                 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
 331                         PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
 332                 if (ret < 0) {
 333                         dev_err(chip->dev,
 334                                 "Failed to update mask reg: %d\n", ret);
 335                         return ret;
 336                 }
 337
 338         } else {
 339                 dev_warn(chip->dev, "No IRQ configured\n");
 340         }
 341
 342         config.dev = chip->dev;
 343         config.regmap = chip->regmap;
 344
 345         for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
 346                 if (init_data)
 347                         config.init_data = &init_data[i];
 348
 349                 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
 350                         ret = regmap_read(chip->regmap,
 351                                 pv88090_regulator_info[i].conf2, &conf2);
 352                         if (ret < 0)
 353                                 return ret;
 354
 355                         conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
 356                                 PV88090_BUCK_VDAC_RANGE_MASK;
 357
 358                         ret = regmap_read(chip->regmap,
 359                                 PV88090_REG_BUCK_FOLD_RANGE, &range);
 360                         if (ret < 0)
 361                                 return ret;
 362
 363                         range = (range >>
 364                                  (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
 365                                 PV88090_BUCK_VRANGE_GAIN_MASK;
 366                         index = ((range << 1) | conf2);
 367                         if (index > PV88090_ID_BUCK3) {
 368                                 dev_err(chip->dev,
 369                                         "Invalid index(%d)\n", index);
 370                                 return -EINVAL;
 371                         }
 372
 373                         pv88090_regulator_info[i].desc.min_uV
 374                                 = pv88090_buck_vol[index].min_uV;
 375                         pv88090_regulator_info[i].desc.uV_step
 376                                 = pv88090_buck_vol[index].uV_step;
 377                         pv88090_regulator_info[i].desc.n_voltages
 378                                 = ((pv88090_buck_vol[index].max_uV)
 379                                 - (pv88090_buck_vol[index].min_uV))
 380                                 /(pv88090_buck_vol[index].uV_step) + 1;
 381                 }
 382
 383                 config.driver_data = (void *)&pv88090_regulator_info[i];
 384                 chip->rdev[i] = devm_regulator_register(chip->dev,
 385                         &pv88090_regulator_info[i].desc, &config);
 386                 if (IS_ERR(chip->rdev[i])) {
 387                         dev_err(chip->dev,
 388                                 "Failed to register PV88090 regulator\n");
 389                         return PTR_ERR(chip->rdev[i]);
 390                 }
 391         }
 392
 393         return 0;
 394 }
 395
 396 static const struct i2c_device_id pv88090_i2c_id[] = {
 397         {"pv88090", 0},
 398         {},
 399 };
 400 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
 401
 402 #ifdef CONFIG_OF
 403 static const struct of_device_id pv88090_dt_ids[] = {
 404         { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
 405         {},
 406 };
 407 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
 408 #endif
 409
 410 static struct i2c_driver pv88090_regulator_driver = {
 411         .driver = {
 412                 .name = "pv88090",
 413                 .of_match_table = of_match_ptr(pv88090_dt_ids),
 414         },
 415         .probe = pv88090_i2c_probe,
 416         .id_table = pv88090_i2c_id,
 417 };
 418
 419 module_i2c_driver(pv88090_regulator_driver);
 420
 421 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 422 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
 423 MODULE_LICENSE("GPL");