drivers/regulator/pv88060-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // pv88060-regulator.c - Regulator device driver for PV88060
   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 "pv88060-regulator.h"
  18
  19 #define PV88060_MAX_REGULATORS  14
  20
  21 /* PV88060 REGULATOR IDs */
  22 enum {
  23         /* BUCKs */
  24         PV88060_ID_BUCK1,
  25
  26         /* LDOs */
  27         PV88060_ID_LDO1,
  28         PV88060_ID_LDO2,
  29         PV88060_ID_LDO3,
  30         PV88060_ID_LDO4,
  31         PV88060_ID_LDO5,
  32         PV88060_ID_LDO6,
  33         PV88060_ID_LDO7,
  34
  35         /* SWTs */
  36         PV88060_ID_SW1,
  37         PV88060_ID_SW2,
  38         PV88060_ID_SW3,
  39         PV88060_ID_SW4,
  40         PV88060_ID_SW5,
  41         PV88060_ID_SW6,
  42 };
  43
  44 struct pv88060_regulator {
  45         struct regulator_desc desc;
  46         unsigned int conf;              /* buck configuration register */
  47 };
  48
  49 struct pv88060 {
  50         struct device *dev;
  51         struct regmap *regmap;
  52         struct regulator_dev *rdev[PV88060_MAX_REGULATORS];
  53 };
  54
  55 static const struct regmap_config pv88060_regmap_config = {
  56         .reg_bits = 8,
  57         .val_bits = 8,
  58 };
  59
  60 /* Current limits array (in uA) for BUCK1
  61  * Entry indexes corresponds to register values.
  62  */
  63
  64 static const unsigned int pv88060_buck1_limits[] = {
  65         1496000, 2393000, 3291000, 4189000
  66 };
  67
  68 static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev)
  69 {
  70         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
  71         unsigned int data;
  72         int ret, mode = 0;
  73
  74         ret = regmap_read(rdev->regmap, info->conf, &data);
  75         if (ret < 0)
  76                 return ret;
  77
  78         switch (data & PV88060_BUCK_MODE_MASK) {
  79         case PV88060_BUCK_MODE_SYNC:
  80                 mode = REGULATOR_MODE_FAST;
  81                 break;
  82         case PV88060_BUCK_MODE_AUTO:
  83                 mode = REGULATOR_MODE_NORMAL;
  84                 break;
  85         case PV88060_BUCK_MODE_SLEEP:
  86                 mode = REGULATOR_MODE_STANDBY;
  87                 break;
  88         }
  89
  90         return mode;
  91 }
  92
  93 static int pv88060_buck_set_mode(struct regulator_dev *rdev,
  94                                         unsigned int mode)
  95 {
  96         struct pv88060_regulator *info = rdev_get_drvdata(rdev);
  97         int val = 0;
  98
  99         switch (mode) {
 100         case REGULATOR_MODE_FAST:
 101                 val = PV88060_BUCK_MODE_SYNC;
 102                 break;
 103         case REGULATOR_MODE_NORMAL:
 104                 val = PV88060_BUCK_MODE_AUTO;
 105                 break;
 106         case REGULATOR_MODE_STANDBY:
 107                 val = PV88060_BUCK_MODE_SLEEP;
 108                 break;
 109         default:
 110                 return -EINVAL;
 111         }
 112
 113         return regmap_update_bits(rdev->regmap, info->conf,
 114                                         PV88060_BUCK_MODE_MASK, val);
 115 }
 116
 117 static const struct regulator_ops pv88060_buck_ops = {
 118         .get_mode = pv88060_buck_get_mode,
 119         .set_mode = pv88060_buck_set_mode,
 120         .enable = regulator_enable_regmap,
 121         .disable = regulator_disable_regmap,
 122         .is_enabled = regulator_is_enabled_regmap,
 123         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 124         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 125         .list_voltage = regulator_list_voltage_linear,
 126         .set_current_limit = regulator_set_current_limit_regmap,
 127         .get_current_limit = regulator_get_current_limit_regmap,
 128 };
 129
 130 static const struct regulator_ops pv88060_ldo_ops = {
 131         .enable = regulator_enable_regmap,
 132         .disable = regulator_disable_regmap,
 133         .is_enabled = regulator_is_enabled_regmap,
 134         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 135         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 136         .list_voltage = regulator_list_voltage_linear,
 137 };
 138
 139 static const struct regulator_ops pv88060_sw_ops = {
 140         .enable = regulator_enable_regmap,
 141         .disable = regulator_disable_regmap,
 142         .is_enabled = regulator_is_enabled_regmap,
 143 };
 144
 145 #define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \
 146 {\
 147         .desc   =       {\
 148                 .id = chip##_ID_##regl_name,\
 149                 .name = __stringify(chip##_##regl_name),\
 150                 .of_match = of_match_ptr(#regl_name),\
 151                 .regulators_node = of_match_ptr("regulators"),\
 152                 .type = REGULATOR_VOLTAGE,\
 153                 .owner = THIS_MODULE,\
 154                 .ops = &pv88060_buck_ops,\
 155                 .min_uV = min,\
 156                 .uV_step = step,\
 157                 .n_voltages = ((max) - (min))/(step) + 1,\
 158                 .enable_reg = PV88060_REG_##regl_name##_CONF0,\
 159                 .enable_mask = PV88060_BUCK_EN, \
 160                 .vsel_reg = PV88060_REG_##regl_name##_CONF0,\
 161                 .vsel_mask = PV88060_VBUCK_MASK,\
 162                 .curr_table = limits_array,\
 163                 .n_current_limits = ARRAY_SIZE(limits_array),\
 164                 .csel_reg = PV88060_REG_##regl_name##_CONF1,\
 165                 .csel_mask = PV88060_BUCK_ILIM_MASK,\
 166         },\
 167         .conf = PV88060_REG_##regl_name##_CONF1,\
 168 }
 169
 170 #define PV88060_LDO(chip, regl_name, min, step, max) \
 171 {\
 172         .desc   =       {\
 173                 .id = chip##_ID_##regl_name,\
 174                 .name = __stringify(chip##_##regl_name),\
 175                 .of_match = of_match_ptr(#regl_name),\
 176                 .regulators_node = of_match_ptr("regulators"),\
 177                 .type = REGULATOR_VOLTAGE,\
 178                 .owner = THIS_MODULE,\
 179                 .ops = &pv88060_ldo_ops,\
 180                 .min_uV = min, \
 181                 .uV_step = step, \
 182                 .n_voltages = (step) ? ((max - min) / step + 1) : 1, \
 183                 .enable_reg = PV88060_REG_##regl_name##_CONF, \
 184                 .enable_mask = PV88060_LDO_EN, \
 185                 .vsel_reg = PV88060_REG_##regl_name##_CONF, \
 186                 .vsel_mask = PV88060_VLDO_MASK, \
 187         },\
 188 }
 189
 190 #define PV88060_SW(chip, regl_name, max) \
 191 {\
 192         .desc   =       {\
 193                 .id = chip##_ID_##regl_name,\
 194                 .name = __stringify(chip##_##regl_name),\
 195                 .of_match = of_match_ptr(#regl_name),\
 196                 .regulators_node = of_match_ptr("regulators"),\
 197                 .type = REGULATOR_VOLTAGE,\
 198                 .owner = THIS_MODULE,\
 199                 .ops = &pv88060_sw_ops,\
 200                 .fixed_uV = max,\
 201                 .n_voltages = 1,\
 202                 .enable_reg = PV88060_REG_##regl_name##_CONF,\
 203                 .enable_mask = PV88060_SW_EN,\
 204         },\
 205 }
 206
 207 static const struct pv88060_regulator pv88060_regulator_info[] = {
 208         PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500,
 209                 pv88060_buck1_limits),
 210         PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000),
 211         PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000),
 212         PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000),
 213         PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000),
 214         PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000),
 215         PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000),
 216         PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000),
 217         PV88060_SW(PV88060, SW1, 5000000),
 218         PV88060_SW(PV88060, SW2, 5000000),
 219         PV88060_SW(PV88060, SW3, 5000000),
 220         PV88060_SW(PV88060, SW4, 5000000),
 221         PV88060_SW(PV88060, SW5, 5000000),
 222         PV88060_SW(PV88060, SW6, 5000000),
 223 };
 224
 225 static irqreturn_t pv88060_irq_handler(int irq, void *data)
 226 {
 227         struct pv88060 *chip = data;
 228         int i, reg_val, err, ret = IRQ_NONE;
 229
 230         err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, &reg_val);
 231         if (err < 0)
 232                 goto error_i2c;
 233
 234         if (reg_val & PV88060_E_VDD_FLT) {
 235                 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 236                         if (chip->rdev[i] != NULL) {
 237                                 regulator_lock(chip->rdev[i]);
 238                                 regulator_notifier_call_chain(chip->rdev[i],
 239                                         REGULATOR_EVENT_UNDER_VOLTAGE,
 240                                         NULL);
 241                                 regulator_unlock(chip->rdev[i]);
 242                         }
 243                 }
 244
 245                 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
 246                         PV88060_E_VDD_FLT);
 247                 if (err < 0)
 248                         goto error_i2c;
 249
 250                 ret = IRQ_HANDLED;
 251         }
 252
 253         if (reg_val & PV88060_E_OVER_TEMP) {
 254                 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 255                         if (chip->rdev[i] != NULL) {
 256                                 regulator_lock(chip->rdev[i]);
 257                                 regulator_notifier_call_chain(chip->rdev[i],
 258                                         REGULATOR_EVENT_OVER_TEMP,
 259                                         NULL);
 260                                 regulator_unlock(chip->rdev[i]);
 261                         }
 262                 }
 263
 264                 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
 265                         PV88060_E_OVER_TEMP);
 266                 if (err < 0)
 267                         goto error_i2c;
 268
 269                 ret = IRQ_HANDLED;
 270         }
 271
 272         return ret;
 273
 274 error_i2c:
 275         dev_err(chip->dev, "I2C error : %d\n", err);
 276         return IRQ_NONE;
 277 }
 278
 279 /*
 280  * I2C driver interface functions
 281  */
 282 static int pv88060_i2c_probe(struct i2c_client *i2c,
 283                 const struct i2c_device_id *id)
 284 {
 285         struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
 286         struct pv88060 *chip;
 287         struct regulator_config config = { };
 288         int error, i, ret = 0;
 289
 290         chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL);
 291         if (!chip)
 292                 return -ENOMEM;
 293
 294         chip->dev = &i2c->dev;
 295         chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_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, PV88060_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, PV88060_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 = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF);
 321                 if (ret < 0) {
 322                         dev_err(chip->dev,
 323                                 "Failed to mask C reg: %d\n", ret);
 324                         return ret;
 325                 }
 326
 327                 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
 328                                         pv88060_irq_handler,
 329                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 330                                         "pv88060", chip);
 331                 if (ret != 0) {
 332                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 333                                 i2c->irq);
 334                         return ret;
 335                 }
 336
 337                 ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A,
 338                         PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0);
 339                 if (ret < 0) {
 340                         dev_err(chip->dev,
 341                                 "Failed to update mask reg: %d\n", ret);
 342                         return ret;
 343                 }
 344
 345         } else {
 346                 dev_warn(chip->dev, "No IRQ configured\n");
 347         }
 348
 349         config.dev = chip->dev;
 350         config.regmap = chip->regmap;
 351
 352         for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 353                 if (init_data)
 354                         config.init_data = &init_data[i];
 355
 356                 config.driver_data = (void *)&pv88060_regulator_info[i];
 357                 chip->rdev[i] = devm_regulator_register(chip->dev,
 358                         &pv88060_regulator_info[i].desc, &config);
 359                 if (IS_ERR(chip->rdev[i])) {
 360                         dev_err(chip->dev,
 361                                 "Failed to register PV88060 regulator\n");
 362                         return PTR_ERR(chip->rdev[i]);
 363                 }
 364         }
 365
 366         return 0;
 367 }
 368
 369 static const struct i2c_device_id pv88060_i2c_id[] = {
 370         {"pv88060", 0},
 371         {},
 372 };
 373 MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id);
 374
 375 #ifdef CONFIG_OF
 376 static const struct of_device_id pv88060_dt_ids[] = {
 377         { .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] },
 378         {},
 379 };
 380 MODULE_DEVICE_TABLE(of, pv88060_dt_ids);
 381 #endif
 382
 383 static struct i2c_driver pv88060_regulator_driver = {
 384         .driver = {
 385                 .name = "pv88060",
 386                 .of_match_table = of_match_ptr(pv88060_dt_ids),
 387         },
 388         .probe = pv88060_i2c_probe,
 389         .id_table = pv88060_i2c_id,
 390 };
 391
 392 module_i2c_driver(pv88060_regulator_driver);
 393
 394 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 395 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060");
 396 MODULE_LICENSE("GPL");