drivers/regulator/pv88060-regulator.c

   1 /*
   2  * pv88060-regulator.c - Regulator device driver for PV88060
   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 "pv88060-regulator.h"
  28
  29 #define PV88060_MAX_REGULATORS  14
  30
  31 /* PV88060 REGULATOR IDs */
  32 enum {
  33         /* BUCKs */
  34         PV88060_ID_BUCK1,
  35
  36         /* LDOs */
  37         PV88060_ID_LDO1,
  38         PV88060_ID_LDO2,
  39         PV88060_ID_LDO3,
  40         PV88060_ID_LDO4,
  41         PV88060_ID_LDO5,
  42         PV88060_ID_LDO6,
  43         PV88060_ID_LDO7,
  44
  45         /* SWTs */
  46         PV88060_ID_SW1,
  47         PV88060_ID_SW2,
  48         PV88060_ID_SW3,
  49         PV88060_ID_SW4,
  50         PV88060_ID_SW5,
  51         PV88060_ID_SW6,
  52 };
  53
  54 struct pv88060_regulator {
  55         struct regulator_desc desc;
  56         unsigned int conf;              /* buck configuration register */
  57 };
  58
  59 struct pv88060 {
  60         struct device *dev;
  61         struct regmap *regmap;
  62         struct regulator_dev *rdev[PV88060_MAX_REGULATORS];
  63 };
  64
  65 static const struct regmap_config pv88060_regmap_config = {
  66         .reg_bits = 8,
  67         .val_bits = 8,
  68 };
  69
  70 /* Current limits array (in uA) for BUCK1
  71  * Entry indexes corresponds to register values.
  72  */
  73
  74 static const unsigned int pv88060_buck1_limits[] = {
  75         1496000, 2393000, 3291000, 4189000
  76 };
  77
  78 static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev)
  79 {
  80         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
  81         unsigned int data;
  82         int ret, mode = 0;
  83
  84         ret = regmap_read(rdev->regmap, info->conf, &data);
  85         if (ret < 0)
  86                 return ret;
  87
  88         switch (data & PV88060_BUCK_MODE_MASK) {
  89         case PV88060_BUCK_MODE_SYNC:
  90                 mode = REGULATOR_MODE_FAST;
  91                 break;
  92         case PV88060_BUCK_MODE_AUTO:
  93                 mode = REGULATOR_MODE_NORMAL;
  94                 break;
  95         case PV88060_BUCK_MODE_SLEEP:
  96                 mode = REGULATOR_MODE_STANDBY;
  97                 break;
  98         }
  99
 100         return mode;
 101 }
 102
 103 static int pv88060_buck_set_mode(struct regulator_dev *rdev,
 104                                         unsigned int mode)
 105 {
 106         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
 107         int val = 0;
 108
 109         switch (mode) {
 110         case REGULATOR_MODE_FAST:
 111                 val = PV88060_BUCK_MODE_SYNC;
 112                 break;
 113         case REGULATOR_MODE_NORMAL:
 114                 val = PV88060_BUCK_MODE_AUTO;
 115                 break;
 116         case REGULATOR_MODE_STANDBY:
 117                 val = PV88060_BUCK_MODE_SLEEP;
 118                 break;
 119         default:
 120                 return -EINVAL;
 121         }
 122
 123         return regmap_update_bits(rdev->regmap, info->conf,
 124                                         PV88060_BUCK_MODE_MASK, val);
 125 }
 126
 127 static const struct regulator_ops pv88060_buck_ops = {
 128         .get_mode = pv88060_buck_get_mode,
 129         .set_mode = pv88060_buck_set_mode,
 130         .enable = regulator_enable_regmap,
 131         .disable = regulator_disable_regmap,
 132         .is_enabled = regulator_is_enabled_regmap,
 133         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 134         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 135         .list_voltage = regulator_list_voltage_linear,
 136         .set_current_limit = regulator_set_current_limit_regmap,
 137         .get_current_limit = regulator_get_current_limit_regmap,
 138 };
 139
 140 static const struct regulator_ops pv88060_ldo_ops = {
 141         .enable = regulator_enable_regmap,
 142         .disable = regulator_disable_regmap,
 143         .is_enabled = regulator_is_enabled_regmap,
 144         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 145         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 146         .list_voltage = regulator_list_voltage_linear,
 147 };
 148
 149 static const struct regulator_ops pv88060_sw_ops = {
 150         .enable = regulator_enable_regmap,
 151         .disable = regulator_disable_regmap,
 152         .is_enabled = regulator_is_enabled_regmap,
 153 };
 154
 155 #define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \
 156 {\
 157         .desc   =       {\
 158                 .id = chip##_ID_##regl_name,\
 159                 .name = __stringify(chip##_##regl_name),\
 160                 .of_match = of_match_ptr(#regl_name),\
 161                 .regulators_node = of_match_ptr("regulators"),\
 162                 .type = REGULATOR_VOLTAGE,\
 163                 .owner = THIS_MODULE,\
 164                 .ops = &pv88060_buck_ops,\
 165                 .min_uV = min,\
 166                 .uV_step = step,\
 167                 .n_voltages = ((max) - (min))/(step) + 1,\
 168                 .enable_reg = PV88060_REG_##regl_name##_CONF0,\
 169                 .enable_mask = PV88060_BUCK_EN, \
 170                 .vsel_reg = PV88060_REG_##regl_name##_CONF0,\
 171                 .vsel_mask = PV88060_VBUCK_MASK,\
 172                 .curr_table = limits_array,\
 173                 .n_current_limits = ARRAY_SIZE(limits_array),\
 174                 .csel_reg = PV88060_REG_##regl_name##_CONF1,\
 175                 .csel_mask = PV88060_BUCK_ILIM_MASK,\
 176         },\
 177         .conf = PV88060_REG_##regl_name##_CONF1,\
 178 }
 179
 180 #define PV88060_LDO(chip, regl_name, min, step, max) \
 181 {\
 182         .desc   =       {\
 183                 .id = chip##_ID_##regl_name,\
 184                 .name = __stringify(chip##_##regl_name),\
 185                 .of_match = of_match_ptr(#regl_name),\
 186                 .regulators_node = of_match_ptr("regulators"),\
 187                 .type = REGULATOR_VOLTAGE,\
 188                 .owner = THIS_MODULE,\
 189                 .ops = &pv88060_ldo_ops,\
 190                 .min_uV = min, \
 191                 .uV_step = step, \
 192                 .n_voltages = (step) ? ((max - min) / step + 1) : 1, \
 193                 .enable_reg = PV88060_REG_##regl_name##_CONF, \
 194                 .enable_mask = PV88060_LDO_EN, \
 195                 .vsel_reg = PV88060_REG_##regl_name##_CONF, \
 196                 .vsel_mask = PV88060_VLDO_MASK, \
 197         },\
 198 }
 199
 200 #define PV88060_SW(chip, regl_name, max) \
 201 {\
 202         .desc   =       {\
 203                 .id = chip##_ID_##regl_name,\
 204                 .name = __stringify(chip##_##regl_name),\
 205                 .of_match = of_match_ptr(#regl_name),\
 206                 .regulators_node = of_match_ptr("regulators"),\
 207                 .type = REGULATOR_VOLTAGE,\
 208                 .owner = THIS_MODULE,\
 209                 .ops = &pv88060_sw_ops,\
 210                 .fixed_uV = max,\
 211                 .n_voltages = 1,\
 212                 .enable_reg = PV88060_REG_##regl_name##_CONF,\
 213                 .enable_mask = PV88060_SW_EN,\
 214         },\
 215 }
 216
 217 static const struct pv88060_regulator pv88060_regulator_info[] = {
 218         PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500,
 219                 pv88060_buck1_limits),
 220         PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000),
 221         PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000),
 222         PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000),
 223         PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000),
 224         PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000),
 225         PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000),
 226         PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000),
 227         PV88060_SW(PV88060, SW1, 5000000),
 228         PV88060_SW(PV88060, SW2, 5000000),
 229         PV88060_SW(PV88060, SW3, 5000000),
 230         PV88060_SW(PV88060, SW4, 5000000),
 231         PV88060_SW(PV88060, SW5, 5000000),
 232         PV88060_SW(PV88060, SW6, 5000000),
 233 };
 234
 235 static irqreturn_t pv88060_irq_handler(int irq, void *data)
 236 {
 237         struct pv88060 *chip = data;
 238         int i, reg_val, err, ret = IRQ_NONE;
 239
 240         err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, &reg_val);
 241         if (err < 0)
 242                 goto error_i2c;
 243
 244         if (reg_val & PV88060_E_VDD_FLT) {
 245                 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 246                         if (chip->rdev[i] != NULL) {
 247                                 regulator_notifier_call_chain(chip->rdev[i],
 248                                         REGULATOR_EVENT_UNDER_VOLTAGE,
 249                                         NULL);
 250                         }
 251                 }
 252
 253                 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
 254                         PV88060_E_VDD_FLT);
 255                 if (err < 0)
 256                         goto error_i2c;
 257
 258                 ret = IRQ_HANDLED;
 259         }
 260
 261         if (reg_val & PV88060_E_OVER_TEMP) {
 262                 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 263                         if (chip->rdev[i] != NULL) {
 264                                 regulator_notifier_call_chain(chip->rdev[i],
 265                                         REGULATOR_EVENT_OVER_TEMP,
 266                                         NULL);
 267                         }
 268                 }
 269
 270                 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
 271                         PV88060_E_OVER_TEMP);
 272                 if (err < 0)
 273                         goto error_i2c;
 274
 275                 ret = IRQ_HANDLED;
 276         }
 277
 278         return ret;
 279
 280 error_i2c:
 281         dev_err(chip->dev, "I2C error : %d\n", err);
 282         return IRQ_NONE;
 283 }
 284
 285 /*
 286  * I2C driver interface functions
 287  */
 288 static int pv88060_i2c_probe(struct i2c_client *i2c,
 289                 const struct i2c_device_id *id)
 290 {
 291         struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 292         struct pv88060 *chip;
 293         struct regulator_config config = { };
 294         int error, i, ret = 0;
 295
 296         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL);
 297         if (!chip)
 298                 return -ENOMEM;
 299
 300         chip->dev = &i2c->dev;
 301         chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_regmap_config);
 302         if (IS_ERR(chip->regmap)) {
 303                 error = PTR_ERR(chip->regmap);
 304                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 305                         error);
 306                 return error;
 307         }
 308
 309         i2c_set_clientdata(i2c, chip);
 310
 311         if (i2c->irq != 0) {
 312                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_A, 0xFF);
 313                 if (ret < 0) {
 314                         dev_err(chip->dev,
 315                                 "Failed to mask A reg: %d\n", ret);
 316                         return ret;
 317                 }
 318
 319                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_B, 0xFF);
 320                 if (ret < 0) {
 321                         dev_err(chip->dev,
 322                                 "Failed to mask B reg: %d\n", ret);
 323                         return ret;
 324                 }
 325
 326                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF);
 327                 if (ret < 0) {
 328                         dev_err(chip->dev,
 329                                 "Failed to mask C reg: %d\n", ret);
 330                         return ret;
 331                 }
 332
 333                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 334                                         pv88060_irq_handler,
 335                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 336                                         "pv88060", chip);
 337                 if (ret != 0) {
 338                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 339                                 i2c->irq);
 340                         return ret;
 341                 }
 342
 343                 ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A,
 344                         PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0);
 345                 if (ret < 0) {
 346                         dev_err(chip->dev,
 347                                 "Failed to update mask reg: %d\n", ret);
 348                         return ret;
 349                 }
 350
 351         } else {
 352                 dev_warn(chip->dev, "No IRQ configured\n");
 353         }
 354
 355         config.dev = chip->dev;
 356         config.regmap = chip->regmap;
 357
 358         for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 359                 if (init_data)
 360                         config.init_data = &init_data[i];
 361
 362                 config.driver_data = (void *)&pv88060_regulator_info[i];
 363                 chip->rdev[i] = devm_regulator_register(chip->dev,
 364                         &pv88060_regulator_info[i].desc, &config);
 365                 if (IS_ERR(chip->rdev[i])) {
 366                         dev_err(chip->dev,
 367                                 "Failed to register PV88060 regulator\n");
 368                         return PTR_ERR(chip->rdev[i]);
 369                 }
 370         }
 371
 372         return 0;
 373 }
 374
 375 static const struct i2c_device_id pv88060_i2c_id[] = {
 376         {"pv88060", 0},
 377         {},
 378 };
 379 MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id);
 380
 381 #ifdef CONFIG_OF
 382 static const struct of_device_id pv88060_dt_ids[] = {
 383         { .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] },
 384         {},
 385 };
 386 MODULE_DEVICE_TABLE(of, pv88060_dt_ids);
 387 #endif
 388
 389 static struct i2c_driver pv88060_regulator_driver = {
 390         .driver = {
 391                 .name = "pv88060",
 392                 .of_match_table = of_match_ptr(pv88060_dt_ids),
 393         },
 394         .probe = pv88060_i2c_probe,
 395         .id_table = pv88060_i2c_id,
 396 };
 397
 398 module_i2c_driver(pv88060_regulator_driver);
 399
 400 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 401 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060");
 402 MODULE_LICENSE("GPL");