drivers/regulator/lp3971.c

   1 /*
   2  * Regulator driver for National Semiconductors LP3971 PMIC chip
   3  *
   4  *  Copyright (C) 2009 Samsung Electronics
   5  *  Author: Marek Szyprowski <m.szyprowski@samsung.com>
   6  *
   7  * Based on wm8350.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  */
  14
  15 #include <linux/bug.h>
  16 #include <linux/err.h>
  17 #include <linux/i2c.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/lp3971.h>
  22 #include <linux/slab.h>
  23
  24 struct lp3971 {
  25         struct device *dev;
  26         struct mutex io_lock;
  27         struct i2c_client *i2c;
  28         int num_regulators;
  29         struct regulator_dev **rdev;
  30 };
  31
  32 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
  33 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
  34
  35 #define LP3971_SYS_CONTROL1_REG 0x07
  36
  37 /* System control register 1 initial value,
  38    bits 4 and 5 are EPROM programmable */
  39 #define SYS_CONTROL1_INIT_VAL 0x40
  40 #define SYS_CONTROL1_INIT_MASK 0xCF
  41
  42 #define LP3971_BUCK_VOL_ENABLE_REG 0x10
  43 #define LP3971_BUCK_VOL_CHANGE_REG 0x20
  44
  45 /*      Voltage control registers shift:
  46         LP3971_BUCK1 -> 0
  47         LP3971_BUCK2 -> 4
  48         LP3971_BUCK3 -> 6
  49 */
  50 #define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
  51 #define BUCK_VOL_CHANGE_FLAG_GO 0x01
  52 #define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
  53 #define BUCK_VOL_CHANGE_FLAG_MASK 0x03
  54
  55 #define LP3971_BUCK1_BASE 0x23
  56 #define LP3971_BUCK2_BASE 0x29
  57 #define LP3971_BUCK3_BASE 0x32
  58
  59 static const int buck_base_addr[] = {
  60         LP3971_BUCK1_BASE,
  61         LP3971_BUCK2_BASE,
  62         LP3971_BUCK3_BASE,
  63 };
  64
  65 #define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
  66 #define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
  67
  68 static const unsigned int buck_voltage_map[] = {
  69               0,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
  70         1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
  71         1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
  72         3000000, 3300000,
  73 };
  74
  75 #define BUCK_TARGET_VOL_MASK 0x3f
  76
  77 #define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
  78
  79 #define LP3971_LDO_ENABLE_REG 0x12
  80 #define LP3971_LDO_VOL_CONTR_BASE 0x39
  81
  82 /*      Voltage control registers:
  83         LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
  84         LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
  85         LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
  86         LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
  87         LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
  88 */
  89 #define LP3971_LDO_VOL_CONTR_REG(x)     (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
  90
  91 /*      Voltage control registers shift:
  92         LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
  93         LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
  94         LP3971_LDO5 -> 0
  95 */
  96 #define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
  97 #define LDO_VOL_CONTR_MASK 0x0f
  98
  99 static const unsigned int ldo45_voltage_map[] = {
 100         1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
 101         1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
 102 };
 103
 104 static const unsigned int ldo123_voltage_map[] = {
 105         1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
 106         2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
 107 };
 108
 109 #define LDO_VOL_MIN_IDX 0x00
 110 #define LDO_VOL_MAX_IDX 0x0f
 111
 112 static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
 113 {
 114         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 115         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 116         u16 mask = 1 << (1 + ldo);
 117         u16 val;
 118
 119         val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
 120         return (val & mask) != 0;
 121 }
 122
 123 static int lp3971_ldo_enable(struct regulator_dev *dev)
 124 {
 125         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 126         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 127         u16 mask = 1 << (1 + ldo);
 128
 129         return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
 130 }
 131
 132 static int lp3971_ldo_disable(struct regulator_dev *dev)
 133 {
 134         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 135         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 136         u16 mask = 1 << (1 + ldo);
 137
 138         return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
 139 }
 140
 141 static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
 142 {
 143         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 144         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 145         u16 val, reg;
 146
 147         reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
 148         val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
 149
 150         return val;
 151 }
 152
 153 static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
 154                                       unsigned int selector)
 155 {
 156         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 157         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 158
 159         return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
 160                         LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
 161                         selector << LDO_VOL_CONTR_SHIFT(ldo));
 162 }
 163
 164 static struct regulator_ops lp3971_ldo_ops = {
 165         .list_voltage = regulator_list_voltage_table,
 166         .is_enabled = lp3971_ldo_is_enabled,
 167         .enable = lp3971_ldo_enable,
 168         .disable = lp3971_ldo_disable,
 169         .get_voltage_sel = lp3971_ldo_get_voltage_sel,
 170         .set_voltage_sel = lp3971_ldo_set_voltage_sel,
 171 };
 172
 173 static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
 174 {
 175         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 176         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 177         u16 mask = 1 << (buck * 2);
 178         u16 val;
 179
 180         val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
 181         return (val & mask) != 0;
 182 }
 183
 184 static int lp3971_dcdc_enable(struct regulator_dev *dev)
 185 {
 186         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 187         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 188         u16 mask = 1 << (buck * 2);
 189
 190         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
 191 }
 192
 193 static int lp3971_dcdc_disable(struct regulator_dev *dev)
 194 {
 195         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 196         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 197         u16 mask = 1 << (buck * 2);
 198
 199         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
 200 }
 201
 202 static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
 203 {
 204         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 205         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 206         u16 reg;
 207
 208         reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
 209         reg &= BUCK_TARGET_VOL_MASK;
 210
 211         return reg;
 212 }
 213
 214 static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
 215                                        unsigned int selector)
 216 {
 217         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 218         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 219         int ret;
 220
 221         ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
 222                BUCK_TARGET_VOL_MASK, selector);
 223         if (ret)
 224                 return ret;
 225
 226         ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
 227                BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
 228                BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
 229         if (ret)
 230                 return ret;
 231
 232         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
 233                BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
 234                0 << BUCK_VOL_CHANGE_SHIFT(buck));
 235 }
 236
 237 static struct regulator_ops lp3971_dcdc_ops = {
 238         .list_voltage = regulator_list_voltage_table,
 239         .is_enabled = lp3971_dcdc_is_enabled,
 240         .enable = lp3971_dcdc_enable,
 241         .disable = lp3971_dcdc_disable,
 242         .get_voltage_sel = lp3971_dcdc_get_voltage_sel,
 243         .set_voltage_sel = lp3971_dcdc_set_voltage_sel,
 244 };
 245
 246 static const struct regulator_desc regulators[] = {
 247         {
 248                 .name = "LDO1",
 249                 .id = LP3971_LDO1,
 250                 .ops = &lp3971_ldo_ops,
 251                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 252                 .volt_table = ldo123_voltage_map,
 253                 .type = REGULATOR_VOLTAGE,
 254                 .owner = THIS_MODULE,
 255         },
 256         {
 257                 .name = "LDO2",
 258                 .id = LP3971_LDO2,
 259                 .ops = &lp3971_ldo_ops,
 260                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 261                 .volt_table = ldo123_voltage_map,
 262                 .type = REGULATOR_VOLTAGE,
 263                 .owner = THIS_MODULE,
 264         },
 265         {
 266                 .name = "LDO3",
 267                 .id = LP3971_LDO3,
 268                 .ops = &lp3971_ldo_ops,
 269                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 270                 .volt_table = ldo123_voltage_map,
 271                 .type = REGULATOR_VOLTAGE,
 272                 .owner = THIS_MODULE,
 273         },
 274         {
 275                 .name = "LDO4",
 276                 .id = LP3971_LDO4,
 277                 .ops = &lp3971_ldo_ops,
 278                 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
 279                 .volt_table = ldo45_voltage_map,
 280                 .type = REGULATOR_VOLTAGE,
 281                 .owner = THIS_MODULE,
 282         },
 283         {
 284                 .name = "LDO5",
 285                 .id = LP3971_LDO5,
 286                 .ops = &lp3971_ldo_ops,
 287                 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
 288                 .volt_table = ldo45_voltage_map,
 289                 .type = REGULATOR_VOLTAGE,
 290                 .owner = THIS_MODULE,
 291         },
 292         {
 293                 .name = "DCDC1",
 294                 .id = LP3971_DCDC1,
 295                 .ops = &lp3971_dcdc_ops,
 296                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 297                 .volt_table = buck_voltage_map,
 298                 .type = REGULATOR_VOLTAGE,
 299                 .owner = THIS_MODULE,
 300         },
 301         {
 302                 .name = "DCDC2",
 303                 .id = LP3971_DCDC2,
 304                 .ops = &lp3971_dcdc_ops,
 305                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 306                 .volt_table = buck_voltage_map,
 307                 .type = REGULATOR_VOLTAGE,
 308                 .owner = THIS_MODULE,
 309         },
 310         {
 311                 .name = "DCDC3",
 312                 .id = LP3971_DCDC3,
 313                 .ops = &lp3971_dcdc_ops,
 314                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 315                 .volt_table = buck_voltage_map,
 316                 .type = REGULATOR_VOLTAGE,
 317                 .owner = THIS_MODULE,
 318         },
 319 };
 320
 321 static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
 322         u16 *dest)
 323 {
 324         int ret;
 325
 326         if (count != 1)
 327                 return -EIO;
 328         ret = i2c_smbus_read_byte_data(i2c, reg);
 329         if (ret < 0)
 330                 return -EIO;
 331
 332         *dest = ret;
 333         return 0;
 334 }
 335
 336 static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
 337         const u16 *src)
 338 {
 339         if (count != 1)
 340                 return -EIO;
 341         return i2c_smbus_write_byte_data(i2c, reg, *src);
 342 }
 343
 344 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
 345 {
 346         u16 val = 0;
 347
 348         mutex_lock(&lp3971->io_lock);
 349
 350         lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
 351
 352         dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
 353                 (unsigned)val&0xff);
 354
 355         mutex_unlock(&lp3971->io_lock);
 356
 357         return val & 0xff;
 358 }
 359
 360 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
 361 {
 362         u16 tmp;
 363         int ret;
 364
 365         mutex_lock(&lp3971->io_lock);
 366
 367         ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
 368         tmp = (tmp & ~mask) | val;
 369         if (ret == 0) {
 370                 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
 371                 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
 372                         (unsigned)val&0xff);
 373         }
 374         mutex_unlock(&lp3971->io_lock);
 375
 376         return ret;
 377 }
 378
 379 static int setup_regulators(struct lp3971 *lp3971,
 380                                       struct lp3971_platform_data *pdata)
 381 {
 382         int i, err;
 383
 384         lp3971->num_regulators = pdata->num_regulators;
 385         lp3971->rdev = kcalloc(pdata->num_regulators,
 386                                 sizeof(struct regulator_dev *), GFP_KERNEL);
 387         if (!lp3971->rdev) {
 388                 err = -ENOMEM;
 389                 goto err_nomem;
 390         }
 391
 392         /* Instantiate the regulators */
 393         for (i = 0; i < pdata->num_regulators; i++) {
 394                 struct regulator_config config = { };
 395                 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
 396
 397                 config.dev = lp3971->dev;
 398                 config.init_data = reg->initdata;
 399                 config.driver_data = lp3971;
 400
 401                 lp3971->rdev[i] = regulator_register(&regulators[reg->id],
 402                                                      &config);
 403                 if (IS_ERR(lp3971->rdev[i])) {
 404                         err = PTR_ERR(lp3971->rdev[i]);
 405                         dev_err(lp3971->dev, "regulator init failed: %d\n",
 406                                 err);
 407                         goto error;
 408                 }
 409         }
 410
 411         return 0;
 412
 413 error:
 414         while (--i >= 0)
 415                 regulator_unregister(lp3971->rdev[i]);
 416         kfree(lp3971->rdev);
 417         lp3971->rdev = NULL;
 418 err_nomem:
 419         return err;
 420 }
 421
 422 static int lp3971_i2c_probe(struct i2c_client *i2c,
 423                             const struct i2c_device_id *id)
 424 {
 425         struct lp3971 *lp3971;
 426         struct lp3971_platform_data *pdata = i2c->dev.platform_data;
 427         int ret;
 428         u16 val;
 429
 430         if (!pdata) {
 431                 dev_dbg(&i2c->dev, "No platform init data supplied\n");
 432                 return -ENODEV;
 433         }
 434
 435         lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
 436         if (lp3971 == NULL)
 437                 return -ENOMEM;
 438
 439         lp3971->i2c = i2c;
 440         lp3971->dev = &i2c->dev;
 441
 442         mutex_init(&lp3971->io_lock);
 443
 444         /* Detect LP3971 */
 445         ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
 446         if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
 447                 ret = -ENODEV;
 448         if (ret < 0) {
 449                 dev_err(&i2c->dev, "failed to detect device\n");
 450                 goto err_detect;
 451         }
 452
 453         ret = setup_regulators(lp3971, pdata);
 454         if (ret < 0)
 455                 goto err_detect;
 456
 457         i2c_set_clientdata(i2c, lp3971);
 458         return 0;
 459
 460 err_detect:
 461         kfree(lp3971);
 462         return ret;
 463 }
 464
 465 static int lp3971_i2c_remove(struct i2c_client *i2c)
 466 {
 467         struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
 468         int i;
 469
 470         for (i = 0; i < lp3971->num_regulators; i++)
 471                 regulator_unregister(lp3971->rdev[i]);
 472
 473         kfree(lp3971->rdev);
 474         kfree(lp3971);
 475
 476         return 0;
 477 }
 478
 479 static const struct i2c_device_id lp3971_i2c_id[] = {
 480        { "lp3971", 0 },
 481        { }
 482 };
 483 MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
 484
 485 static struct i2c_driver lp3971_i2c_driver = {
 486         .driver = {
 487                 .name = "LP3971",
 488                 .owner = THIS_MODULE,
 489         },
 490         .probe    = lp3971_i2c_probe,
 491         .remove   = lp3971_i2c_remove,
 492         .id_table = lp3971_i2c_id,
 493 };
 494
 495 module_i2c_driver(lp3971_i2c_driver);
 496
 497 MODULE_LICENSE("GPL");
 498 MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
 499 MODULE_DESCRIPTION("LP3971 PMIC driver");