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