drivers/regulator/lp3971.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Regulator driver for National Semiconductors LP3971 PMIC chip
   4  *
   5  *  Copyright (C) 2009 Samsung Electronics
   6  *  Author: Marek Szyprowski <m.szyprowski@samsung.com>
   7  *
   8  * Based on wm8350.c
   9  */
  10
  11 #include <linux/bug.h>
  12 #include <linux/err.h>
  13 #include <linux/i2c.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/lp3971.h>
  18 #include <linux/slab.h>
  19
  20 struct lp3971 {
  21         struct device *dev;
  22         struct mutex io_lock;
  23         struct i2c_client *i2c;
  24 };
  25
  26 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
  27 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
  28
  29 #define LP3971_SYS_CONTROL1_REG 0x07
  30
  31 /* System control register 1 initial value,
  32    bits 4 and 5 are EPROM programmable */
  33 #define SYS_CONTROL1_INIT_VAL 0x40
  34 #define SYS_CONTROL1_INIT_MASK 0xCF
  35
  36 #define LP3971_BUCK_VOL_ENABLE_REG 0x10
  37 #define LP3971_BUCK_VOL_CHANGE_REG 0x20
  38
  39 /*      Voltage control registers shift:
  40         LP3971_BUCK1 -> 0
  41         LP3971_BUCK2 -> 4
  42         LP3971_BUCK3 -> 6
  43 */
  44 #define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
  45 #define BUCK_VOL_CHANGE_FLAG_GO 0x01
  46 #define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
  47 #define BUCK_VOL_CHANGE_FLAG_MASK 0x03
  48
  49 #define LP3971_BUCK1_BASE 0x23
  50 #define LP3971_BUCK2_BASE 0x29
  51 #define LP3971_BUCK3_BASE 0x32
  52
  53 static const int buck_base_addr[] = {
  54         LP3971_BUCK1_BASE,
  55         LP3971_BUCK2_BASE,
  56         LP3971_BUCK3_BASE,
  57 };
  58
  59 #define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
  60 #define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
  61
  62 static const unsigned int buck_voltage_map[] = {
  63               0,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
  64         1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
  65         1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
  66         3000000, 3300000,
  67 };
  68
  69 #define BUCK_TARGET_VOL_MASK 0x3f
  70
  71 #define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
  72
  73 #define LP3971_LDO_ENABLE_REG 0x12
  74 #define LP3971_LDO_VOL_CONTR_BASE 0x39
  75
  76 /*      Voltage control registers:
  77         LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
  78         LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
  79         LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
  80         LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
  81         LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
  82 */
  83 #define LP3971_LDO_VOL_CONTR_REG(x)     (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
  84
  85 /*      Voltage control registers shift:
  86         LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
  87         LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
  88         LP3971_LDO5 -> 0
  89 */
  90 #define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
  91 #define LDO_VOL_CONTR_MASK 0x0f
  92
  93 static const unsigned int ldo45_voltage_map[] = {
  94         1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
  95         1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
  96 };
  97
  98 static const unsigned int ldo123_voltage_map[] = {
  99         1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
 100         2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
 101 };
 102
 103 #define LDO_VOL_MIN_IDX 0x00
 104 #define LDO_VOL_MAX_IDX 0x0f
 105
 106 static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
 107 {
 108         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 109         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 110         u16 mask = 1 << (1 + ldo);
 111         u16 val;
 112
 113         val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
 114         return (val & mask) != 0;
 115 }
 116
 117 static int lp3971_ldo_enable(struct regulator_dev *dev)
 118 {
 119         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 120         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 121         u16 mask = 1 << (1 + ldo);
 122
 123         return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
 124 }
 125
 126 static int lp3971_ldo_disable(struct regulator_dev *dev)
 127 {
 128         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 129         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 130         u16 mask = 1 << (1 + ldo);
 131
 132         return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
 133 }
 134
 135 static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
 136 {
 137         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 138         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 139         u16 val, reg;
 140
 141         reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
 142         val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
 143
 144         return val;
 145 }
 146
 147 static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
 148                                       unsigned int selector)
 149 {
 150         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 151         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 152
 153         return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
 154                         LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
 155                         selector << LDO_VOL_CONTR_SHIFT(ldo));
 156 }
 157
 158 static const struct regulator_ops lp3971_ldo_ops = {
 159         .list_voltage = regulator_list_voltage_table,
 160         .map_voltage = regulator_map_voltage_ascend,
 161         .is_enabled = lp3971_ldo_is_enabled,
 162         .enable = lp3971_ldo_enable,
 163         .disable = lp3971_ldo_disable,
 164         .get_voltage_sel = lp3971_ldo_get_voltage_sel,
 165         .set_voltage_sel = lp3971_ldo_set_voltage_sel,
 166 };
 167
 168 static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
 169 {
 170         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 171         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 172         u16 mask = 1 << (buck * 2);
 173         u16 val;
 174
 175         val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
 176         return (val & mask) != 0;
 177 }
 178
 179 static int lp3971_dcdc_enable(struct regulator_dev *dev)
 180 {
 181         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 182         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 183         u16 mask = 1 << (buck * 2);
 184
 185         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
 186 }
 187
 188 static int lp3971_dcdc_disable(struct regulator_dev *dev)
 189 {
 190         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 191         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 192         u16 mask = 1 << (buck * 2);
 193
 194         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
 195 }
 196
 197 static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
 198 {
 199         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 200         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 201         u16 reg;
 202
 203         reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
 204         reg &= BUCK_TARGET_VOL_MASK;
 205
 206         return reg;
 207 }
 208
 209 static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
 210                                        unsigned int selector)
 211 {
 212         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 213         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 214         int ret;
 215
 216         ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
 217                BUCK_TARGET_VOL_MASK, selector);
 218         if (ret)
 219                 return ret;
 220
 221         ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
 222                BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
 223                BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
 224         if (ret)
 225                 return ret;
 226
 227         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
 228                BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
 229                0 << BUCK_VOL_CHANGE_SHIFT(buck));
 230 }
 231
 232 static const struct regulator_ops lp3971_dcdc_ops = {
 233         .list_voltage = regulator_list_voltage_table,
 234         .map_voltage = regulator_map_voltage_ascend,
 235         .is_enabled = lp3971_dcdc_is_enabled,
 236         .enable = lp3971_dcdc_enable,
 237         .disable = lp3971_dcdc_disable,
 238         .get_voltage_sel = lp3971_dcdc_get_voltage_sel,
 239         .set_voltage_sel = lp3971_dcdc_set_voltage_sel,
 240 };
 241
 242 static const struct regulator_desc regulators[] = {
 243         {
 244                 .name = "LDO1",
 245                 .id = LP3971_LDO1,
 246                 .ops = &lp3971_ldo_ops,
 247                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 248                 .volt_table = ldo123_voltage_map,
 249                 .type = REGULATOR_VOLTAGE,
 250                 .owner = THIS_MODULE,
 251         },
 252         {
 253                 .name = "LDO2",
 254                 .id = LP3971_LDO2,
 255                 .ops = &lp3971_ldo_ops,
 256                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 257                 .volt_table = ldo123_voltage_map,
 258                 .type = REGULATOR_VOLTAGE,
 259                 .owner = THIS_MODULE,
 260         },
 261         {
 262                 .name = "LDO3",
 263                 .id = LP3971_LDO3,
 264                 .ops = &lp3971_ldo_ops,
 265                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 266                 .volt_table = ldo123_voltage_map,
 267                 .type = REGULATOR_VOLTAGE,
 268                 .owner = THIS_MODULE,
 269         },
 270         {
 271                 .name = "LDO4",
 272                 .id = LP3971_LDO4,
 273                 .ops = &lp3971_ldo_ops,
 274                 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
 275                 .volt_table = ldo45_voltage_map,
 276                 .type = REGULATOR_VOLTAGE,
 277                 .owner = THIS_MODULE,
 278         },
 279         {
 280                 .name = "LDO5",
 281                 .id = LP3971_LDO5,
 282                 .ops = &lp3971_ldo_ops,
 283                 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
 284                 .volt_table = ldo45_voltage_map,
 285                 .type = REGULATOR_VOLTAGE,
 286                 .owner = THIS_MODULE,
 287         },
 288         {
 289                 .name = "DCDC1",
 290                 .id = LP3971_DCDC1,
 291                 .ops = &lp3971_dcdc_ops,
 292                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 293                 .volt_table = buck_voltage_map,
 294                 .type = REGULATOR_VOLTAGE,
 295                 .owner = THIS_MODULE,
 296         },
 297         {
 298                 .name = "DCDC2",
 299                 .id = LP3971_DCDC2,
 300                 .ops = &lp3971_dcdc_ops,
 301                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 302                 .volt_table = buck_voltage_map,
 303                 .type = REGULATOR_VOLTAGE,
 304                 .owner = THIS_MODULE,
 305         },
 306         {
 307                 .name = "DCDC3",
 308                 .id = LP3971_DCDC3,
 309                 .ops = &lp3971_dcdc_ops,
 310                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 311                 .volt_table = buck_voltage_map,
 312                 .type = REGULATOR_VOLTAGE,
 313                 .owner = THIS_MODULE,
 314         },
 315 };
 316
 317 static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
 318         u16 *dest)
 319 {
 320         int ret;
 321
 322         if (count != 1)
 323                 return -EIO;
 324         ret = i2c_smbus_read_byte_data(i2c, reg);
 325         if (ret < 0)
 326                 return ret;
 327
 328         *dest = ret;
 329         return 0;
 330 }
 331
 332 static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
 333         const u16 *src)
 334 {
 335         if (count != 1)
 336                 return -EIO;
 337         return i2c_smbus_write_byte_data(i2c, reg, *src);
 338 }
 339
 340 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
 341 {
 342         u16 val = 0;
 343
 344         mutex_lock(&lp3971->io_lock);
 345
 346         lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
 347
 348         dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
 349                 (unsigned)val&0xff);
 350
 351         mutex_unlock(&lp3971->io_lock);
 352
 353         return val & 0xff;
 354 }
 355
 356 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
 357 {
 358         u16 tmp;
 359         int ret;
 360
 361         mutex_lock(&lp3971->io_lock);
 362
 363         ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
 364         if (ret == 0) {
 365                 tmp = (tmp & ~mask) | val;
 366                 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
 367                 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
 368                         (unsigned)val&0xff);
 369         }
 370         mutex_unlock(&lp3971->io_lock);
 371
 372         return ret;
 373 }
 374
 375 static int setup_regulators(struct lp3971 *lp3971,
 376                                       struct lp3971_platform_data *pdata)
 377 {
 378         int i, err;
 379
 380         /* Instantiate the regulators */
 381         for (i = 0; i < pdata->num_regulators; i++) {
 382                 struct regulator_config config = { };
 383                 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
 384                 struct regulator_dev *rdev;
 385
 386                 config.dev = lp3971->dev;
 387                 config.init_data = reg->initdata;
 388                 config.driver_data = lp3971;
 389
 390                 rdev = devm_regulator_register(lp3971->dev,
 391                                                &regulators[reg->id], &config);
 392                 if (IS_ERR(rdev)) {
 393                         err = PTR_ERR(rdev);
 394                         dev_err(lp3971->dev, "regulator init failed: %d\n",
 395                                 err);
 396                         return err;
 397                 }
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int lp3971_i2c_probe(struct i2c_client *i2c)
 404 {
 405         struct lp3971 *lp3971;
 406         struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
 407         int ret;
 408         u16 val;
 409
 410         if (!pdata) {
 411                 dev_dbg(&i2c->dev, "No platform init data supplied\n");
 412                 return -ENODEV;
 413         }
 414
 415         lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
 416         if (lp3971 == NULL)
 417                 return -ENOMEM;
 418
 419         lp3971->i2c = i2c;
 420         lp3971->dev = &i2c->dev;
 421
 422         mutex_init(&lp3971->io_lock);
 423
 424         /* Detect LP3971 */
 425         ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
 426         if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
 427                 ret = -ENODEV;
 428         if (ret < 0) {
 429                 dev_err(&i2c->dev, "failed to detect device\n");
 430                 return ret;
 431         }
 432
 433         ret = setup_regulators(lp3971, pdata);
 434         if (ret < 0)
 435                 return ret;
 436
 437         i2c_set_clientdata(i2c, lp3971);
 438         return 0;
 439 }
 440
 441 static const struct i2c_device_id lp3971_i2c_id[] = {
 442         { "lp3971", 0 },
 443         { }
 444 };
 445 MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
 446
 447 static struct i2c_driver lp3971_i2c_driver = {
 448         .driver = {
 449                 .name = "LP3971",
 450         },
 451         .probe_new = lp3971_i2c_probe,
 452         .id_table = lp3971_i2c_id,
 453 };
 454
 455 module_i2c_driver(lp3971_i2c_driver);
 456
 457 MODULE_LICENSE("GPL");
 458 MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
 459 MODULE_DESCRIPTION("LP3971 PMIC driver");