drivers/regulator/tps6507x-regulator.c

   1 /*
   2  * tps6507x-regulator.c
   3  *
   4  * Regulator driver for TPS65073 PMIC
   5  *
   6  * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation version 2.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  13  * whether express or implied; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/err.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/regulator/driver.h>
  24 #include <linux/regulator/machine.h>
  25 #include <linux/regulator/tps6507x.h>
  26 #include <linux/slab.h>
  27 #include <linux/mfd/tps6507x.h>
  28
  29 /* DCDC's */
  30 #define TPS6507X_DCDC_1                         0
  31 #define TPS6507X_DCDC_2                         1
  32 #define TPS6507X_DCDC_3                         2
  33 /* LDOs */
  34 #define TPS6507X_LDO_1                          3
  35 #define TPS6507X_LDO_2                          4
  36
  37 #define TPS6507X_MAX_REG_ID                     TPS6507X_LDO_2
  38
  39 /* Number of step-down converters available */
  40 #define TPS6507X_NUM_DCDC                       3
  41 /* Number of LDO voltage regulators  available */
  42 #define TPS6507X_NUM_LDO                        2
  43 /* Number of total regulators available */
  44 #define TPS6507X_NUM_REGULATOR          (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
  45
  46 /* Supported voltage values for regulators (in microVolts) */
  47 static const unsigned int VDCDCx_VSEL_table[] = {
  48         725000, 750000, 775000, 800000,
  49         825000, 850000, 875000, 900000,
  50         925000, 950000, 975000, 1000000,
  51         1025000, 1050000, 1075000, 1100000,
  52         1125000, 1150000, 1175000, 1200000,
  53         1225000, 1250000, 1275000, 1300000,
  54         1325000, 1350000, 1375000, 1400000,
  55         1425000, 1450000, 1475000, 1500000,
  56         1550000, 1600000, 1650000, 1700000,
  57         1750000, 1800000, 1850000, 1900000,
  58         1950000, 2000000, 2050000, 2100000,
  59         2150000, 2200000, 2250000, 2300000,
  60         2350000, 2400000, 2450000, 2500000,
  61         2550000, 2600000, 2650000, 2700000,
  62         2750000, 2800000, 2850000, 2900000,
  63         3000000, 3100000, 3200000, 3300000,
  64 };
  65
  66 static const unsigned int LDO1_VSEL_table[] = {
  67         1000000, 1100000, 1200000, 1250000,
  68         1300000, 1350000, 1400000, 1500000,
  69         1600000, 1800000, 2500000, 2750000,
  70         2800000, 3000000, 3100000, 3300000,
  71 };
  72
  73 /* The voltage mapping table for LDO2 is the same as VDCDCx */
  74 #define LDO2_VSEL_table VDCDCx_VSEL_table
  75
  76 struct tps_info {
  77         const char *name;
  78         u8 table_len;
  79         const unsigned int *table;
  80
  81         /* Does DCDC high or the low register defines output voltage? */
  82         bool defdcdc_default;
  83 };
  84
  85 static struct tps_info tps6507x_pmic_regs[] = {
  86         {
  87                 .name = "VDCDC1",
  88                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
  89                 .table = VDCDCx_VSEL_table,
  90         },
  91         {
  92                 .name = "VDCDC2",
  93                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
  94                 .table = VDCDCx_VSEL_table,
  95         },
  96         {
  97                 .name = "VDCDC3",
  98                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
  99                 .table = VDCDCx_VSEL_table,
 100         },
 101         {
 102                 .name = "LDO1",
 103                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
 104                 .table = LDO1_VSEL_table,
 105         },
 106         {
 107                 .name = "LDO2",
 108                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
 109                 .table = LDO2_VSEL_table,
 110         },
 111 };
 112
 113 struct tps6507x_pmic {
 114         struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
 115         struct tps6507x_dev *mfd;
 116         struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
 117         struct tps_info *info[TPS6507X_NUM_REGULATOR];
 118         struct mutex io_lock;
 119 };
 120 static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
 121 {
 122         u8 val;
 123         int err;
 124
 125         err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
 126
 127         if (err)
 128                 return err;
 129
 130         return val;
 131 }
 132
 133 static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 134 {
 135         return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
 136 }
 137
 138 static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 139 {
 140         int err, data;
 141
 142         mutex_lock(&tps->io_lock);
 143
 144         data = tps6507x_pmic_read(tps, reg);
 145         if (data < 0) {
 146                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 147                 err = data;
 148                 goto out;
 149         }
 150
 151         data |= mask;
 152         err = tps6507x_pmic_write(tps, reg, data);
 153         if (err)
 154                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 155
 156 out:
 157         mutex_unlock(&tps->io_lock);
 158         return err;
 159 }
 160
 161 static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 162 {
 163         int err, data;
 164
 165         mutex_lock(&tps->io_lock);
 166
 167         data = tps6507x_pmic_read(tps, reg);
 168         if (data < 0) {
 169                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 170                 err = data;
 171                 goto out;
 172         }
 173
 174         data &= ~mask;
 175         err = tps6507x_pmic_write(tps, reg, data);
 176         if (err)
 177                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 178
 179 out:
 180         mutex_unlock(&tps->io_lock);
 181         return err;
 182 }
 183
 184 static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
 185 {
 186         int data;
 187
 188         mutex_lock(&tps->io_lock);
 189
 190         data = tps6507x_pmic_read(tps, reg);
 191         if (data < 0)
 192                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 193
 194         mutex_unlock(&tps->io_lock);
 195         return data;
 196 }
 197
 198 static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 199 {
 200         int err;
 201
 202         mutex_lock(&tps->io_lock);
 203
 204         err = tps6507x_pmic_write(tps, reg, val);
 205         if (err < 0)
 206                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 207
 208         mutex_unlock(&tps->io_lock);
 209         return err;
 210 }
 211
 212 static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
 213 {
 214         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 215         int data, rid = rdev_get_id(dev);
 216         u8 shift;
 217
 218         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 219                 return -EINVAL;
 220
 221         shift = TPS6507X_MAX_REG_ID - rid;
 222         data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
 223
 224         if (data < 0)
 225                 return data;
 226         else
 227                 return (data & 1<<shift) ? 1 : 0;
 228 }
 229
 230 static int tps6507x_pmic_enable(struct regulator_dev *dev)
 231 {
 232         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 233         int rid = rdev_get_id(dev);
 234         u8 shift;
 235
 236         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 237                 return -EINVAL;
 238
 239         shift = TPS6507X_MAX_REG_ID - rid;
 240         return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 241 }
 242
 243 static int tps6507x_pmic_disable(struct regulator_dev *dev)
 244 {
 245         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 246         int rid = rdev_get_id(dev);
 247         u8 shift;
 248
 249         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 250                 return -EINVAL;
 251
 252         shift = TPS6507X_MAX_REG_ID - rid;
 253         return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
 254                                         1 << shift);
 255 }
 256
 257 static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
 258 {
 259         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 260         int data, rid = rdev_get_id(dev);
 261         u8 reg, mask;
 262
 263         switch (rid) {
 264         case TPS6507X_DCDC_1:
 265                 reg = TPS6507X_REG_DEFDCDC1;
 266                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 267                 break;
 268         case TPS6507X_DCDC_2:
 269                 if (tps->info[rid]->defdcdc_default)
 270                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
 271                 else
 272                         reg = TPS6507X_REG_DEFDCDC2_LOW;
 273                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 274                 break;
 275         case TPS6507X_DCDC_3:
 276                 if (tps->info[rid]->defdcdc_default)
 277                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
 278                 else
 279                         reg = TPS6507X_REG_DEFDCDC3_LOW;
 280                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 281                 break;
 282         case TPS6507X_LDO_1:
 283                 reg = TPS6507X_REG_LDO_CTRL1;
 284                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 285                 break;
 286         case TPS6507X_LDO_2:
 287                 reg = TPS6507X_REG_DEFLDO2;
 288                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 289                 break;
 290         default:
 291                 return -EINVAL;
 292         }
 293
 294         data = tps6507x_pmic_reg_read(tps, reg);
 295         if (data < 0)
 296                 return data;
 297
 298         data &= mask;
 299         return data;
 300 }
 301
 302 static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
 303                                           unsigned selector)
 304 {
 305         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 306         int data, rid = rdev_get_id(dev);
 307         u8 reg, mask;
 308
 309         switch (rid) {
 310         case TPS6507X_DCDC_1:
 311                 reg = TPS6507X_REG_DEFDCDC1;
 312                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 313                 break;
 314         case TPS6507X_DCDC_2:
 315                 if (tps->info[rid]->defdcdc_default)
 316                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
 317                 else
 318                         reg = TPS6507X_REG_DEFDCDC2_LOW;
 319                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 320                 break;
 321         case TPS6507X_DCDC_3:
 322                 if (tps->info[rid]->defdcdc_default)
 323                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
 324                 else
 325                         reg = TPS6507X_REG_DEFDCDC3_LOW;
 326                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 327                 break;
 328         case TPS6507X_LDO_1:
 329                 reg = TPS6507X_REG_LDO_CTRL1;
 330                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 331                 break;
 332         case TPS6507X_LDO_2:
 333                 reg = TPS6507X_REG_DEFLDO2;
 334                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 335                 break;
 336         default:
 337                 return -EINVAL;
 338         }
 339
 340         data = tps6507x_pmic_reg_read(tps, reg);
 341         if (data < 0)
 342                 return data;
 343
 344         data &= ~mask;
 345         data |= selector;
 346
 347         return tps6507x_pmic_reg_write(tps, reg, data);
 348 }
 349
 350 static struct regulator_ops tps6507x_pmic_ops = {
 351         .is_enabled = tps6507x_pmic_is_enabled,
 352         .enable = tps6507x_pmic_enable,
 353         .disable = tps6507x_pmic_disable,
 354         .get_voltage_sel = tps6507x_pmic_get_voltage_sel,
 355         .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
 356         .list_voltage = regulator_list_voltage_table,
 357 };
 358
 359 static __devinit int tps6507x_pmic_probe(struct platform_device *pdev)
 360 {
 361         struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
 362         struct tps_info *info = &tps6507x_pmic_regs[0];
 363         struct regulator_config config = { };
 364         struct regulator_init_data *init_data;
 365         struct regulator_dev *rdev;
 366         struct tps6507x_pmic *tps;
 367         struct tps6507x_board *tps_board;
 368         int i;
 369         int error;
 370
 371         /**
 372          * tps_board points to pmic related constants
 373          * coming from the board-evm file.
 374          */
 375
 376         tps_board = dev_get_platdata(tps6507x_dev->dev);
 377         if (!tps_board)
 378                 return -EINVAL;
 379
 380         /**
 381          * init_data points to array of regulator_init structures
 382          * coming from the board-evm file.
 383          */
 384         init_data = tps_board->tps6507x_pmic_init_data;
 385         if (!init_data)
 386                 return -EINVAL;
 387
 388         tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
 389         if (!tps)
 390                 return -ENOMEM;
 391
 392         mutex_init(&tps->io_lock);
 393
 394         /* common for all regulators */
 395         tps->mfd = tps6507x_dev;
 396
 397         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
 398                 /* Register the regulators */
 399                 tps->info[i] = info;
 400                 if (init_data->driver_data) {
 401                         struct tps6507x_reg_platform_data *data =
 402                                                         init_data->driver_data;
 403                         tps->info[i]->defdcdc_default = data->defdcdc_default;
 404                 }
 405
 406                 tps->desc[i].name = info->name;
 407                 tps->desc[i].id = i;
 408                 tps->desc[i].n_voltages = info->table_len;
 409                 tps->desc[i].volt_table = info->table;
 410                 tps->desc[i].ops = &tps6507x_pmic_ops;
 411                 tps->desc[i].type = REGULATOR_VOLTAGE;
 412                 tps->desc[i].owner = THIS_MODULE;
 413
 414                 config.dev = tps6507x_dev->dev;
 415                 config.init_data = init_data;
 416                 config.driver_data = tps;
 417
 418                 rdev = regulator_register(&tps->desc[i], &config);
 419                 if (IS_ERR(rdev)) {
 420                         dev_err(tps6507x_dev->dev,
 421                                 "failed to register %s regulator\n",
 422                                 pdev->name);
 423                         error = PTR_ERR(rdev);
 424                         goto fail;
 425                 }
 426
 427                 /* Save regulator for cleanup */
 428                 tps->rdev[i] = rdev;
 429         }
 430
 431         tps6507x_dev->pmic = tps;
 432         platform_set_drvdata(pdev, tps6507x_dev);
 433
 434         return 0;
 435
 436 fail:
 437         while (--i >= 0)
 438                 regulator_unregister(tps->rdev[i]);
 439         return error;
 440 }
 441
 442 static int __devexit tps6507x_pmic_remove(struct platform_device *pdev)
 443 {
 444         struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
 445         struct tps6507x_pmic *tps = tps6507x_dev->pmic;
 446         int i;
 447
 448         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
 449                 regulator_unregister(tps->rdev[i]);
 450         return 0;
 451 }
 452
 453 static struct platform_driver tps6507x_pmic_driver = {
 454         .driver = {
 455                 .name = "tps6507x-pmic",
 456                 .owner = THIS_MODULE,
 457         },
 458         .probe = tps6507x_pmic_probe,
 459         .remove = __devexit_p(tps6507x_pmic_remove),
 460 };
 461
 462 static int __init tps6507x_pmic_init(void)
 463 {
 464         return platform_driver_register(&tps6507x_pmic_driver);
 465 }
 466 subsys_initcall(tps6507x_pmic_init);
 467
 468 static void __exit tps6507x_pmic_cleanup(void)
 469 {
 470         platform_driver_unregister(&tps6507x_pmic_driver);
 471 }
 472 module_exit(tps6507x_pmic_cleanup);
 473
 474 MODULE_AUTHOR("Texas Instruments");
 475 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
 476 MODULE_LICENSE("GPL v2");
 477 MODULE_ALIAS("platform:tps6507x-pmic");