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         /* Current limiting */
  57         unsigned        n_current_limits;
  58         const int       *current_limits;
  59         unsigned int limit_mask;
  60         unsigned int conf;              /* buck configuration register */
  61 };
  62
  63 struct pv88060 {
  64         struct device *dev;
  65         struct regmap *regmap;
  66         struct regulator_dev *rdev[PV88060_MAX_REGULATORS];
  67 };
  68
  69 static const struct regmap_config pv88060_regmap_config = {
  70         .reg_bits = 8,
  71         .val_bits = 8,
  72 };
  73
  74 /* Current limits array (in uA) for BUCK1
  75  * Entry indexes corresponds to register values.
  76  */
  77
  78 static const int pv88060_buck1_limits[] = {
  79         1496000, 2393000, 3291000, 4189000
  80 };
  81
  82 static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev)
  83 {
  84         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
  85         unsigned int data;
  86         int ret, mode = 0;
  87
  88         ret = regmap_read(rdev->regmap, info->conf, &data);
  89         if (ret < 0)
  90                 return ret;
  91
  92         switch (data & PV88060_BUCK_MODE_MASK) {
  93         case PV88060_BUCK_MODE_SYNC:
  94                 mode = REGULATOR_MODE_FAST;
  95                 break;
  96         case PV88060_BUCK_MODE_AUTO:
  97                 mode = REGULATOR_MODE_NORMAL;
  98                 break;
  99         case PV88060_BUCK_MODE_SLEEP:
 100                 mode = REGULATOR_MODE_STANDBY;
 101                 break;
 102         }
 103
 104         return mode;
 105 }
 106
 107 static int pv88060_buck_set_mode(struct regulator_dev *rdev,
 108                                         unsigned int mode)
 109 {
 110         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
 111         int val = 0;
 112
 113         switch (mode) {
 114         case REGULATOR_MODE_FAST:
 115                 val = PV88060_BUCK_MODE_SYNC;
 116                 break;
 117         case REGULATOR_MODE_NORMAL:
 118                 val = PV88060_BUCK_MODE_AUTO;
 119                 break;
 120         case REGULATOR_MODE_STANDBY:
 121                 val = PV88060_BUCK_MODE_SLEEP;
 122                 break;
 123         default:
 124                 return -EINVAL;
 125         }
 126
 127         return regmap_update_bits(rdev->regmap, info->conf,
 128                                         PV88060_BUCK_MODE_MASK, val);
 129 }
 130
 131 static int pv88060_set_current_limit(struct regulator_dev *rdev, int min,
 132                                     int max)
 133 {
 134         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
 135         int i;
 136
 137         /* search for closest to maximum */
 138         for (i = info->n_current_limits; i >= 0; i--) {
 139                 if (min <= info->current_limits[i]
 140                         && max >= info->current_limits[i]) {
 141                         return regmap_update_bits(rdev->regmap,
 142                                 info->conf,
 143                                 info->limit_mask,
 144                                 i << PV88060_BUCK_ILIM_SHIFT);
 145                 }
 146         }
 147
 148         return -EINVAL;
 149 }
 150
 151 static int pv88060_get_current_limit(struct regulator_dev *rdev)
 152 {
 153         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
 154         unsigned int data;
 155         int ret;
 156
 157         ret = regmap_read(rdev->regmap, info->conf, &data);
 158         if (ret < 0)
 159                 return ret;
 160
 161         data = (data & info->limit_mask) >> PV88060_BUCK_ILIM_SHIFT;
 162         return info->current_limits[data];
 163 }
 164
 165 static struct regulator_ops pv88060_buck_ops = {
 166         .get_mode = pv88060_buck_get_mode,
 167         .set_mode = pv88060_buck_set_mode,
 168         .enable = regulator_enable_regmap,
 169         .disable = regulator_disable_regmap,
 170         .is_enabled = regulator_is_enabled_regmap,
 171         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 172         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 173         .list_voltage = regulator_list_voltage_linear,
 174         .set_current_limit = pv88060_set_current_limit,
 175         .get_current_limit = pv88060_get_current_limit,
 176 };
 177
 178 static struct regulator_ops pv88060_ldo_ops = {
 179         .enable = regulator_enable_regmap,
 180         .disable = regulator_disable_regmap,
 181         .is_enabled = regulator_is_enabled_regmap,
 182         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 183         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 184         .list_voltage = regulator_list_voltage_linear,
 185 };
 186
 187 #define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \
 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 = &pv88060_buck_ops,\
 197                 .min_uV = min,\
 198                 .uV_step = step,\
 199                 .n_voltages = ((max) - (min))/(step) + 1,\
 200                 .enable_reg = PV88060_REG_##regl_name##_CONF0,\
 201                 .enable_mask = PV88060_BUCK_EN, \
 202                 .vsel_reg = PV88060_REG_##regl_name##_CONF0,\
 203                 .vsel_mask = PV88060_VBUCK_MASK,\
 204         },\
 205         .current_limits = limits_array,\
 206         .n_current_limits = ARRAY_SIZE(limits_array),\
 207         .limit_mask = PV88060_BUCK_ILIM_MASK, \
 208         .conf = PV88060_REG_##regl_name##_CONF1,\
 209 }
 210
 211 #define PV88060_LDO(chip, regl_name, min, step, max) \
 212 {\
 213         .desc   =       {\
 214                 .id = chip##_ID_##regl_name,\
 215                 .name = __stringify(chip##_##regl_name),\
 216                 .of_match = of_match_ptr(#regl_name),\
 217                 .regulators_node = of_match_ptr("regulators"),\
 218                 .type = REGULATOR_VOLTAGE,\
 219                 .owner = THIS_MODULE,\
 220                 .ops = &pv88060_ldo_ops,\
 221                 .min_uV = min, \
 222                 .uV_step = step, \
 223                 .n_voltages = (step) ? ((max - min) / step + 1) : 1, \
 224                 .enable_reg = PV88060_REG_##regl_name##_CONF, \
 225                 .enable_mask = PV88060_LDO_EN, \
 226                 .vsel_reg = PV88060_REG_##regl_name##_CONF, \
 227                 .vsel_mask = PV88060_VLDO_MASK, \
 228         },\
 229 }
 230
 231 #define PV88060_SW(chip, regl_name, max) \
 232 {\
 233         .desc   =       {\
 234                 .id = chip##_ID_##regl_name,\
 235                 .name = __stringify(chip##_##regl_name),\
 236                 .of_match = of_match_ptr(#regl_name),\
 237                 .regulators_node = of_match_ptr("regulators"),\
 238                 .type = REGULATOR_VOLTAGE,\
 239                 .owner = THIS_MODULE,\
 240                 .ops = &pv88060_ldo_ops,\
 241                 .min_uV = max,\
 242                 .uV_step = 0,\
 243                 .n_voltages = 1,\
 244                 .enable_reg = PV88060_REG_##regl_name##_CONF,\
 245                 .enable_mask = PV88060_SW_EN,\
 246         },\
 247 }
 248
 249 static const struct pv88060_regulator pv88060_regulator_info[] = {
 250         PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500,
 251                 pv88060_buck1_limits),
 252         PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000),
 253         PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000),
 254         PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000),
 255         PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000),
 256         PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000),
 257         PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000),
 258         PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000),
 259         PV88060_SW(PV88060, SW1, 5000000),
 260         PV88060_SW(PV88060, SW2, 5000000),
 261         PV88060_SW(PV88060, SW3, 5000000),
 262         PV88060_SW(PV88060, SW4, 5000000),
 263         PV88060_SW(PV88060, SW5, 5000000),
 264         PV88060_SW(PV88060, SW6, 5000000),
 265 };
 266
 267 static irqreturn_t pv88060_irq_handler(int irq, void *data)
 268 {
 269         struct pv88060 *chip = data;
 270         int i, reg_val, err, ret = IRQ_NONE;
 271
 272         err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, &reg_val);
 273         if (err < 0)
 274                 goto error_i2c;
 275
 276         if (reg_val & PV88060_E_VDD_FLT) {
 277                 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 278                         if (chip->rdev[i] != NULL) {
 279                                 regulator_notifier_call_chain(chip->rdev[i],
 280                                         REGULATOR_EVENT_UNDER_VOLTAGE,
 281                                         NULL);
 282                         }
 283                 }
 284
 285                 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
 286                         PV88060_E_VDD_FLT);
 287                 if (err < 0)
 288                         goto error_i2c;
 289
 290                 ret = IRQ_HANDLED;
 291         }
 292
 293         if (reg_val & PV88060_E_OVER_TEMP) {
 294                 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 295                         if (chip->rdev[i] != NULL) {
 296                                 regulator_notifier_call_chain(chip->rdev[i],
 297                                         REGULATOR_EVENT_OVER_TEMP,
 298                                         NULL);
 299                         }
 300                 }
 301
 302                 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
 303                         PV88060_E_OVER_TEMP);
 304                 if (err < 0)
 305                         goto error_i2c;
 306
 307                 ret = IRQ_HANDLED;
 308         }
 309
 310         return ret;
 311
 312 error_i2c:
 313         dev_err(chip->dev, "I2C error : %d\n", err);
 314         return IRQ_NONE;
 315 }
 316
 317 /*
 318  * I2C driver interface functions
 319  */
 320 static int pv88060_i2c_probe(struct i2c_client *i2c,
 321                 const struct i2c_device_id *id)
 322 {
 323         struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 324         struct pv88060 *chip;
 325         struct regulator_config config = { };
 326         int error, i, ret = 0;
 327
 328         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL);
 329         if (!chip)
 330                 return -ENOMEM;
 331
 332         chip->dev = &i2c->dev;
 333         chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_regmap_config);
 334         if (IS_ERR(chip->regmap)) {
 335                 error = PTR_ERR(chip->regmap);
 336                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 337                         error);
 338                 return error;
 339         }
 340
 341         i2c_set_clientdata(i2c, chip);
 342
 343         if (i2c->irq != 0) {
 344                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_A, 0xFF);
 345                 if (ret < 0) {
 346                         dev_err(chip->dev,
 347                                 "Failed to mask A reg: %d\n", ret);
 348                         return ret;
 349                 }
 350
 351                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_B, 0xFF);
 352                 if (ret < 0) {
 353                         dev_err(chip->dev,
 354                                 "Failed to mask B reg: %d\n", ret);
 355                         return ret;
 356                 }
 357
 358                 ret = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF);
 359                 if (ret < 0) {
 360                         dev_err(chip->dev,
 361                                 "Failed to mask C reg: %d\n", ret);
 362                         return ret;
 363                 }
 364
 365                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 366                                         pv88060_irq_handler,
 367                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 368                                         "pv88060", chip);
 369                 if (ret != 0) {
 370                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 371                                 i2c->irq);
 372                         return ret;
 373                 }
 374
 375                 ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A,
 376                         PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0);
 377                 if (ret < 0) {
 378                         dev_err(chip->dev,
 379                                 "Failed to update mask reg: %d\n", ret);
 380                         return ret;
 381                 }
 382
 383         } else {
 384                 dev_warn(chip->dev, "No IRQ configured\n");
 385         }
 386
 387         config.dev = chip->dev;
 388         config.regmap = chip->regmap;
 389
 390         for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 391                 if (init_data)
 392                         config.init_data = &init_data[i];
 393
 394                 config.driver_data = (void *)&pv88060_regulator_info[i];
 395                 chip->rdev[i] = devm_regulator_register(chip->dev,
 396                         &pv88060_regulator_info[i].desc, &config);
 397                 if (IS_ERR(chip->rdev[i])) {
 398                         dev_err(chip->dev,
 399                                 "Failed to register PV88060 regulator\n");
 400                         return PTR_ERR(chip->rdev[i]);
 401                 }
 402         }
 403
 404         return 0;
 405 }
 406
 407 static const struct i2c_device_id pv88060_i2c_id[] = {
 408         {"pv88060", 0},
 409         {},
 410 };
 411 MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id);
 412
 413 #ifdef CONFIG_OF
 414 static const struct of_device_id pv88060_dt_ids[] = {
 415         { .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] },
 416         {},
 417 };
 418 MODULE_DEVICE_TABLE(of, pv88060_dt_ids);
 419 #endif
 420
 421 static struct i2c_driver pv88060_regulator_driver = {
 422         .driver = {
 423                 .name = "pv88060",
 424                 .of_match_table = of_match_ptr(pv88060_dt_ids),
 425         },
 426         .probe = pv88060_i2c_probe,
 427         .id_table = pv88060_i2c_id,
 428 };
 429
 430 module_i2c_driver(pv88060_regulator_driver);
 431
 432 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 433 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060");
 434 MODULE_LICENSE("GPL");