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/regulator/driver.h>
  20 #include <linux/regulator/lp3971.h>
  21 #include <linux/slab.h>
  22
  23 struct lp3971 {
  24         struct device *dev;
  25         struct mutex io_lock;
  26         struct i2c_client *i2c;
  27         int num_regulators;
  28         struct regulator_dev **rdev;
  29 };
  30
  31 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
  32 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
  33
  34 #define LP3971_SYS_CONTROL1_REG 0x07
  35
  36 /* System control register 1 initial value,
  37    bits 4 and 5 are EPROM programmable */
  38 #define SYS_CONTROL1_INIT_VAL 0x40
  39 #define SYS_CONTROL1_INIT_MASK 0xCF
  40
  41 #define LP3971_BUCK_VOL_ENABLE_REG 0x10
  42 #define LP3971_BUCK_VOL_CHANGE_REG 0x20
  43
  44 /*      Voltage control registers shift:
  45         LP3971_BUCK1 -> 0
  46         LP3971_BUCK2 -> 4
  47         LP3971_BUCK3 -> 6
  48 */
  49 #define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
  50 #define BUCK_VOL_CHANGE_FLAG_GO 0x01
  51 #define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
  52 #define BUCK_VOL_CHANGE_FLAG_MASK 0x03
  53
  54 #define LP3971_BUCK1_BASE 0x23
  55 #define LP3971_BUCK2_BASE 0x29
  56 #define LP3971_BUCK3_BASE 0x32
  57
  58 static const int buck_base_addr[] = {
  59         LP3971_BUCK1_BASE,
  60         LP3971_BUCK2_BASE,
  61         LP3971_BUCK3_BASE,
  62 };
  63
  64 #define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
  65 #define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
  66
  67 static const int buck_voltage_map[] = {
  68            0,  800,  850,  900,  950, 1000, 1050, 1100,
  69         1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500,
  70         1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800,
  71         3000, 3300,
  72 };
  73
  74 #define BUCK_TARGET_VOL_MASK 0x3f
  75 #define BUCK_TARGET_VOL_MIN_IDX 0x01
  76 #define BUCK_TARGET_VOL_MAX_IDX 0x19
  77
  78 #define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
  79
  80 #define LP3971_LDO_ENABLE_REG 0x12
  81 #define LP3971_LDO_VOL_CONTR_BASE 0x39
  82
  83 /*      Voltage control registers:
  84         LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
  85         LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
  86         LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
  87         LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
  88         LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
  89 */
  90 #define LP3971_LDO_VOL_CONTR_REG(x)     (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
  91
  92 /*      Voltage control registers shift:
  93         LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
  94         LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
  95         LP3971_LDO5 -> 0
  96 */
  97 #define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
  98 #define LDO_VOL_CONTR_MASK 0x0f
  99
 100 static const int ldo45_voltage_map[] = {
 101         1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
 102         1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
 103 };
 104
 105 static const int ldo123_voltage_map[] = {
 106         1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
 107         2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
 108 };
 109
 110 static const int *ldo_voltage_map[] = {
 111         ldo123_voltage_map, /* LDO1 */
 112         ldo123_voltage_map, /* LDO2 */
 113         ldo123_voltage_map, /* LDO3 */
 114         ldo45_voltage_map, /* LDO4 */
 115         ldo45_voltage_map, /* LDO5 */
 116 };
 117
 118 #define LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[(x - LP3971_LDO1)])
 119
 120 #define LDO_VOL_MIN_IDX 0x00
 121 #define LDO_VOL_MAX_IDX 0x0f
 122
 123 static int lp3971_ldo_list_voltage(struct regulator_dev *dev, unsigned index)
 124 {
 125         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 126         return 1000 * LDO_VOL_VALUE_MAP(ldo)[index];
 127 }
 128
 129 static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
 130 {
 131         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 132         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 133         u16 mask = 1 << (1 + ldo);
 134         u16 val;
 135
 136         val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
 137         return (val & mask) != 0;
 138 }
 139
 140 static int lp3971_ldo_enable(struct regulator_dev *dev)
 141 {
 142         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 143         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 144         u16 mask = 1 << (1 + ldo);
 145
 146         return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
 147 }
 148
 149 static int lp3971_ldo_disable(struct regulator_dev *dev)
 150 {
 151         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 152         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 153         u16 mask = 1 << (1 + ldo);
 154
 155         return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
 156 }
 157
 158 static int lp3971_ldo_get_voltage(struct regulator_dev *dev)
 159 {
 160         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 161         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 162         u16 val, reg;
 163
 164         reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
 165         val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
 166
 167         return 1000 * LDO_VOL_VALUE_MAP(ldo)[val];
 168 }
 169
 170 static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
 171                                   int min_uV, int max_uV,
 172                                   unsigned int *selector)
 173 {
 174         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 175         int ldo = rdev_get_id(dev) - LP3971_LDO1;
 176         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 177         const int *vol_map = LDO_VOL_VALUE_MAP(ldo);
 178         u16 val;
 179
 180         if (min_vol < vol_map[LDO_VOL_MIN_IDX] ||
 181             min_vol > vol_map[LDO_VOL_MAX_IDX])
 182                 return -EINVAL;
 183
 184         for (val = LDO_VOL_MIN_IDX; val <= LDO_VOL_MAX_IDX; val++)
 185                 if (vol_map[val] >= min_vol)
 186                         break;
 187
 188         if (val > LDO_VOL_MAX_IDX || vol_map[val] > max_vol)
 189                 return -EINVAL;
 190
 191         *selector = val;
 192
 193         return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
 194                         LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
 195                         val << LDO_VOL_CONTR_SHIFT(ldo));
 196 }
 197
 198 static struct regulator_ops lp3971_ldo_ops = {
 199         .list_voltage = lp3971_ldo_list_voltage,
 200         .is_enabled = lp3971_ldo_is_enabled,
 201         .enable = lp3971_ldo_enable,
 202         .disable = lp3971_ldo_disable,
 203         .get_voltage = lp3971_ldo_get_voltage,
 204         .set_voltage = lp3971_ldo_set_voltage,
 205 };
 206
 207 static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
 208 {
 209         return 1000 * buck_voltage_map[index];
 210 }
 211
 212 static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
 213 {
 214         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 215         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 216         u16 mask = 1 << (buck * 2);
 217         u16 val;
 218
 219         val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
 220         return (val & mask) != 0;
 221 }
 222
 223 static int lp3971_dcdc_enable(struct regulator_dev *dev)
 224 {
 225         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 226         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 227         u16 mask = 1 << (buck * 2);
 228
 229         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
 230 }
 231
 232 static int lp3971_dcdc_disable(struct regulator_dev *dev)
 233 {
 234         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 235         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 236         u16 mask = 1 << (buck * 2);
 237
 238         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
 239 }
 240
 241 static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
 242 {
 243         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 244         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 245         u16 reg;
 246         int val;
 247
 248         reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
 249         reg &= BUCK_TARGET_VOL_MASK;
 250
 251         if (reg <= BUCK_TARGET_VOL_MAX_IDX)
 252                 val = 1000 * buck_voltage_map[reg];
 253         else {
 254                 val = 0;
 255                 dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
 256         }
 257
 258         return val;
 259 }
 260
 261 static int lp3971_dcdc_set_voltage(struct regulator_dev *dev,
 262                                    int min_uV, int max_uV,
 263                                    unsigned int *selector)
 264 {
 265         struct lp3971 *lp3971 = rdev_get_drvdata(dev);
 266         int buck = rdev_get_id(dev) - LP3971_DCDC1;
 267         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 268         const int *vol_map = buck_voltage_map;
 269         u16 val;
 270         int ret;
 271
 272         if (min_vol < vol_map[BUCK_TARGET_VOL_MIN_IDX] ||
 273             min_vol > vol_map[BUCK_TARGET_VOL_MAX_IDX])
 274                 return -EINVAL;
 275
 276         for (val = BUCK_TARGET_VOL_MIN_IDX; val <= BUCK_TARGET_VOL_MAX_IDX;
 277              val++)
 278                 if (vol_map[val] >= min_vol)
 279                         break;
 280
 281         if (val > BUCK_TARGET_VOL_MAX_IDX || vol_map[val] > max_vol)
 282                 return -EINVAL;
 283
 284         *selector = val;
 285
 286         ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
 287                BUCK_TARGET_VOL_MASK, val);
 288         if (ret)
 289                 return ret;
 290
 291         ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
 292                BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
 293                BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
 294         if (ret)
 295                 return ret;
 296
 297         return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
 298                BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
 299                0 << BUCK_VOL_CHANGE_SHIFT(buck));
 300 }
 301
 302 static struct regulator_ops lp3971_dcdc_ops = {
 303         .list_voltage = lp3971_dcdc_list_voltage,
 304         .is_enabled = lp3971_dcdc_is_enabled,
 305         .enable = lp3971_dcdc_enable,
 306         .disable = lp3971_dcdc_disable,
 307         .get_voltage = lp3971_dcdc_get_voltage,
 308         .set_voltage = lp3971_dcdc_set_voltage,
 309 };
 310
 311 static struct regulator_desc regulators[] = {
 312         {
 313                 .name = "LDO1",
 314                 .id = LP3971_LDO1,
 315                 .ops = &lp3971_ldo_ops,
 316                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 317                 .type = REGULATOR_VOLTAGE,
 318                 .owner = THIS_MODULE,
 319         },
 320         {
 321                 .name = "LDO2",
 322                 .id = LP3971_LDO2,
 323                 .ops = &lp3971_ldo_ops,
 324                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 325                 .type = REGULATOR_VOLTAGE,
 326                 .owner = THIS_MODULE,
 327         },
 328         {
 329                 .name = "LDO3",
 330                 .id = LP3971_LDO3,
 331                 .ops = &lp3971_ldo_ops,
 332                 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
 333                 .type = REGULATOR_VOLTAGE,
 334                 .owner = THIS_MODULE,
 335         },
 336         {
 337                 .name = "LDO4",
 338                 .id = LP3971_LDO4,
 339                 .ops = &lp3971_ldo_ops,
 340                 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
 341                 .type = REGULATOR_VOLTAGE,
 342                 .owner = THIS_MODULE,
 343         },
 344         {
 345                 .name = "LDO5",
 346                 .id = LP3971_LDO5,
 347                 .ops = &lp3971_ldo_ops,
 348                 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
 349                 .type = REGULATOR_VOLTAGE,
 350                 .owner = THIS_MODULE,
 351         },
 352         {
 353                 .name = "DCDC1",
 354                 .id = LP3971_DCDC1,
 355                 .ops = &lp3971_dcdc_ops,
 356                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 357                 .type = REGULATOR_VOLTAGE,
 358                 .owner = THIS_MODULE,
 359         },
 360         {
 361                 .name = "DCDC2",
 362                 .id = LP3971_DCDC2,
 363                 .ops = &lp3971_dcdc_ops,
 364                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 365                 .type = REGULATOR_VOLTAGE,
 366                 .owner = THIS_MODULE,
 367         },
 368         {
 369                 .name = "DCDC3",
 370                 .id = LP3971_DCDC3,
 371                 .ops = &lp3971_dcdc_ops,
 372                 .n_voltages = ARRAY_SIZE(buck_voltage_map),
 373                 .type = REGULATOR_VOLTAGE,
 374                 .owner = THIS_MODULE,
 375         },
 376 };
 377
 378 static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
 379         u16 *dest)
 380 {
 381         int ret;
 382
 383         if (count != 1)
 384                 return -EIO;
 385         ret = i2c_smbus_read_byte_data(i2c, reg);
 386         if (ret < 0)
 387                 return -EIO;
 388
 389         *dest = ret;
 390         return 0;
 391 }
 392
 393 static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
 394         const u16 *src)
 395 {
 396         if (count != 1)
 397                 return -EIO;
 398         return i2c_smbus_write_byte_data(i2c, reg, *src);
 399 }
 400
 401 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
 402 {
 403         u16 val = 0;
 404
 405         mutex_lock(&lp3971->io_lock);
 406
 407         lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
 408
 409         dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
 410                 (unsigned)val&0xff);
 411
 412         mutex_unlock(&lp3971->io_lock);
 413
 414         return val & 0xff;
 415 }
 416
 417 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
 418 {
 419         u16 tmp;
 420         int ret;
 421
 422         mutex_lock(&lp3971->io_lock);
 423
 424         ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
 425         tmp = (tmp & ~mask) | val;
 426         if (ret == 0) {
 427                 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
 428                 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
 429                         (unsigned)val&0xff);
 430         }
 431         mutex_unlock(&lp3971->io_lock);
 432
 433         return ret;
 434 }
 435
 436 static int __devinit setup_regulators(struct lp3971 *lp3971,
 437                                       struct lp3971_platform_data *pdata)
 438 {
 439         int i, err;
 440
 441         lp3971->num_regulators = pdata->num_regulators;
 442         lp3971->rdev = kcalloc(pdata->num_regulators,
 443                                 sizeof(struct regulator_dev *), GFP_KERNEL);
 444         if (!lp3971->rdev) {
 445                 err = -ENOMEM;
 446                 goto err_nomem;
 447         }
 448
 449         /* Instantiate the regulators */
 450         for (i = 0; i < pdata->num_regulators; i++) {
 451                 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
 452                 lp3971->rdev[i] = regulator_register(&regulators[reg->id],
 453                                         lp3971->dev, reg->initdata, lp3971);
 454
 455                 if (IS_ERR(lp3971->rdev[i])) {
 456                         err = PTR_ERR(lp3971->rdev[i]);
 457                         dev_err(lp3971->dev, "regulator init failed: %d\n",
 458                                 err);
 459                         goto error;
 460                 }
 461         }
 462
 463         return 0;
 464
 465 error:
 466         while (--i >= 0)
 467                 regulator_unregister(lp3971->rdev[i]);
 468         kfree(lp3971->rdev);
 469         lp3971->rdev = NULL;
 470 err_nomem:
 471         return err;
 472 }
 473
 474 static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
 475                             const struct i2c_device_id *id)
 476 {
 477         struct lp3971 *lp3971;
 478         struct lp3971_platform_data *pdata = i2c->dev.platform_data;
 479         int ret;
 480         u16 val;
 481
 482         if (!pdata) {
 483                 dev_dbg(&i2c->dev, "No platform init data supplied\n");
 484                 return -ENODEV;
 485         }
 486
 487         lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
 488         if (lp3971 == NULL)
 489                 return -ENOMEM;
 490
 491         lp3971->i2c = i2c;
 492         lp3971->dev = &i2c->dev;
 493
 494         mutex_init(&lp3971->io_lock);
 495
 496         /* Detect LP3971 */
 497         ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
 498         if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
 499                 ret = -ENODEV;
 500         if (ret < 0) {
 501                 dev_err(&i2c->dev, "failed to detect device\n");
 502                 goto err_detect;
 503         }
 504
 505         ret = setup_regulators(lp3971, pdata);
 506         if (ret < 0)
 507                 goto err_detect;
 508
 509         i2c_set_clientdata(i2c, lp3971);
 510         return 0;
 511
 512 err_detect:
 513         kfree(lp3971);
 514         return ret;
 515 }
 516
 517 static int __devexit lp3971_i2c_remove(struct i2c_client *i2c)
 518 {
 519         struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
 520         int i;
 521
 522         for (i = 0; i < lp3971->num_regulators; i++)
 523                 regulator_unregister(lp3971->rdev[i]);
 524
 525         kfree(lp3971->rdev);
 526         kfree(lp3971);
 527
 528         return 0;
 529 }
 530
 531 static const struct i2c_device_id lp3971_i2c_id[] = {
 532        { "lp3971", 0 },
 533        { }
 534 };
 535 MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
 536
 537 static struct i2c_driver lp3971_i2c_driver = {
 538         .driver = {
 539                 .name = "LP3971",
 540                 .owner = THIS_MODULE,
 541         },
 542         .probe    = lp3971_i2c_probe,
 543         .remove   = __devexit_p(lp3971_i2c_remove),
 544         .id_table = lp3971_i2c_id,
 545 };
 546
 547 static int __init lp3971_module_init(void)
 548 {
 549         int ret;
 550
 551         ret = i2c_add_driver(&lp3971_i2c_driver);
 552         if (ret != 0)
 553                 pr_err("Failed to register I2C driver: %d\n", ret);
 554
 555         return ret;
 556 }
 557 module_init(lp3971_module_init);
 558
 559 static void __exit lp3971_module_exit(void)
 560 {
 561         i2c_del_driver(&lp3971_i2c_driver);
 562 }
 563 module_exit(lp3971_module_exit);
 564
 565 MODULE_LICENSE("GPL");
 566 MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
 567 MODULE_DESCRIPTION("LP3971 PMIC driver");