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/delay.h>
  27 #include <linux/slab.h>
  28 #include <linux/mfd/tps6507x.h>
  29
  30 /* DCDC's */
  31 #define TPS6507X_DCDC_1                         0
  32 #define TPS6507X_DCDC_2                         1
  33 #define TPS6507X_DCDC_3                         2
  34 /* LDOs */
  35 #define TPS6507X_LDO_1                          3
  36 #define TPS6507X_LDO_2                          4
  37
  38 #define TPS6507X_MAX_REG_ID                     TPS6507X_LDO_2
  39
  40 /* Number of step-down converters available */
  41 #define TPS6507X_NUM_DCDC                       3
  42 /* Number of LDO voltage regulators  available */
  43 #define TPS6507X_NUM_LDO                        2
  44 /* Number of total regulators available */
  45 #define TPS6507X_NUM_REGULATOR          (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
  46
  47 /* Supported voltage values for regulators (in milliVolts) */
  48 static const u16 VDCDCx_VSEL_table[] = {
  49         725, 750, 775, 800,
  50         825, 850, 875, 900,
  51         925, 950, 975, 1000,
  52         1025, 1050, 1075, 1100,
  53         1125, 1150, 1175, 1200,
  54         1225, 1250, 1275, 1300,
  55         1325, 1350, 1375, 1400,
  56         1425, 1450, 1475, 1500,
  57         1550, 1600, 1650, 1700,
  58         1750, 1800, 1850, 1900,
  59         1950, 2000, 2050, 2100,
  60         2150, 2200, 2250, 2300,
  61         2350, 2400, 2450, 2500,
  62         2550, 2600, 2650, 2700,
  63         2750, 2800, 2850, 2900,
  64         3000, 3100, 3200, 3300,
  65 };
  66
  67 static const u16 LDO1_VSEL_table[] = {
  68         1000, 1100, 1200, 1250,
  69         1300, 1350, 1400, 1500,
  70         1600, 1800, 2500, 2750,
  71         2800, 3000, 3100, 3300,
  72 };
  73
  74 static const u16 LDO2_VSEL_table[] = {
  75         725, 750, 775, 800,
  76         825, 850, 875, 900,
  77         925, 950, 975, 1000,
  78         1025, 1050, 1075, 1100,
  79         1125, 1150, 1175, 1200,
  80         1225, 1250, 1275, 1300,
  81         1325, 1350, 1375, 1400,
  82         1425, 1450, 1475, 1500,
  83         1550, 1600, 1650, 1700,
  84         1750, 1800, 1850, 1900,
  85         1950, 2000, 2050, 2100,
  86         2150, 2200, 2250, 2300,
  87         2350, 2400, 2450, 2500,
  88         2550, 2600, 2650, 2700,
  89         2750, 2800, 2850, 2900,
  90         3000, 3100, 3200, 3300,
  91 };
  92
  93 struct tps_info {
  94         const char *name;
  95         unsigned min_uV;
  96         unsigned max_uV;
  97         u8 table_len;
  98         const u16 *table;
  99
 100         /* Does DCDC high or the low register defines output voltage? */
 101         bool defdcdc_default;
 102 };
 103
 104 static struct tps_info tps6507x_pmic_regs[] = {
 105         {
 106                 .name = "VDCDC1",
 107                 .min_uV = 725000,
 108                 .max_uV = 3300000,
 109                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 110                 .table = VDCDCx_VSEL_table,
 111         },
 112         {
 113                 .name = "VDCDC2",
 114                 .min_uV = 725000,
 115                 .max_uV = 3300000,
 116                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 117                 .table = VDCDCx_VSEL_table,
 118         },
 119         {
 120                 .name = "VDCDC3",
 121                 .min_uV = 725000,
 122                 .max_uV = 3300000,
 123                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 124                 .table = VDCDCx_VSEL_table,
 125         },
 126         {
 127                 .name = "LDO1",
 128                 .min_uV = 1000000,
 129                 .max_uV = 3300000,
 130                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
 131                 .table = LDO1_VSEL_table,
 132         },
 133         {
 134                 .name = "LDO2",
 135                 .min_uV = 725000,
 136                 .max_uV = 3300000,
 137                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
 138                 .table = LDO2_VSEL_table,
 139         },
 140 };
 141
 142 struct tps6507x_pmic {
 143         struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
 144         struct tps6507x_dev *mfd;
 145         struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
 146         struct tps_info *info[TPS6507X_NUM_REGULATOR];
 147         struct mutex io_lock;
 148 };
 149 static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
 150 {
 151         u8 val;
 152         int err;
 153
 154         err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
 155
 156         if (err)
 157                 return err;
 158
 159         return val;
 160 }
 161
 162 static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 163 {
 164         return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
 165 }
 166
 167 static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 168 {
 169         int err, data;
 170
 171         mutex_lock(&tps->io_lock);
 172
 173         data = tps6507x_pmic_read(tps, reg);
 174         if (data < 0) {
 175                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 176                 err = data;
 177                 goto out;
 178         }
 179
 180         data |= mask;
 181         err = tps6507x_pmic_write(tps, reg, data);
 182         if (err)
 183                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 184
 185 out:
 186         mutex_unlock(&tps->io_lock);
 187         return err;
 188 }
 189
 190 static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
 191 {
 192         int err, data;
 193
 194         mutex_lock(&tps->io_lock);
 195
 196         data = tps6507x_pmic_read(tps, reg);
 197         if (data < 0) {
 198                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 199                 err = data;
 200                 goto out;
 201         }
 202
 203         data &= ~mask;
 204         err = tps6507x_pmic_write(tps, reg, data);
 205         if (err)
 206                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 207
 208 out:
 209         mutex_unlock(&tps->io_lock);
 210         return err;
 211 }
 212
 213 static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
 214 {
 215         int data;
 216
 217         mutex_lock(&tps->io_lock);
 218
 219         data = tps6507x_pmic_read(tps, reg);
 220         if (data < 0)
 221                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
 222
 223         mutex_unlock(&tps->io_lock);
 224         return data;
 225 }
 226
 227 static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
 228 {
 229         int err;
 230
 231         mutex_lock(&tps->io_lock);
 232
 233         err = tps6507x_pmic_write(tps, reg, val);
 234         if (err < 0)
 235                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
 236
 237         mutex_unlock(&tps->io_lock);
 238         return err;
 239 }
 240
 241 static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
 242 {
 243         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 244         int data, rid = rdev_get_id(dev);
 245         u8 shift;
 246
 247         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 248                 return -EINVAL;
 249
 250         shift = TPS6507X_MAX_REG_ID - rid;
 251         data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
 252
 253         if (data < 0)
 254                 return data;
 255         else
 256                 return (data & 1<<shift) ? 1 : 0;
 257 }
 258
 259 static int tps6507x_pmic_enable(struct regulator_dev *dev)
 260 {
 261         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 262         int rid = rdev_get_id(dev);
 263         u8 shift;
 264
 265         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 266                 return -EINVAL;
 267
 268         shift = TPS6507X_MAX_REG_ID - rid;
 269         return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 270 }
 271
 272 static int tps6507x_pmic_disable(struct regulator_dev *dev)
 273 {
 274         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 275         int rid = rdev_get_id(dev);
 276         u8 shift;
 277
 278         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 279                 return -EINVAL;
 280
 281         shift = TPS6507X_MAX_REG_ID - rid;
 282         return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
 283                                         1 << shift);
 284 }
 285
 286 static int tps6507x_pmic_get_voltage(struct regulator_dev *dev)
 287 {
 288         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 289         int data, rid = rdev_get_id(dev);
 290         u8 reg, mask;
 291
 292         switch (rid) {
 293         case TPS6507X_DCDC_1:
 294                 reg = TPS6507X_REG_DEFDCDC1;
 295                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 296                 break;
 297         case TPS6507X_DCDC_2:
 298                 if (tps->info[rid]->defdcdc_default)
 299                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
 300                 else
 301                         reg = TPS6507X_REG_DEFDCDC2_LOW;
 302                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 303                 break;
 304         case TPS6507X_DCDC_3:
 305                 if (tps->info[rid]->defdcdc_default)
 306                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
 307                 else
 308                         reg = TPS6507X_REG_DEFDCDC3_LOW;
 309                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 310                 break;
 311         case TPS6507X_LDO_1:
 312                 reg = TPS6507X_REG_LDO_CTRL1;
 313                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 314                 break;
 315         case TPS6507X_LDO_2:
 316                 reg = TPS6507X_REG_DEFLDO2;
 317                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 318                 break;
 319         default:
 320                 return -EINVAL;
 321         }
 322
 323         data = tps6507x_pmic_reg_read(tps, reg);
 324         if (data < 0)
 325                 return data;
 326
 327         data &= mask;
 328         return tps->info[rid]->table[data] * 1000;
 329 }
 330
 331 static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
 332                                           unsigned selector)
 333 {
 334         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 335         int data, rid = rdev_get_id(dev);
 336         u8 reg, mask;
 337
 338         switch (rid) {
 339         case TPS6507X_DCDC_1:
 340                 reg = TPS6507X_REG_DEFDCDC1;
 341                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 342                 break;
 343         case TPS6507X_DCDC_2:
 344                 if (tps->info[rid]->defdcdc_default)
 345                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
 346                 else
 347                         reg = TPS6507X_REG_DEFDCDC2_LOW;
 348                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 349                 break;
 350         case TPS6507X_DCDC_3:
 351                 if (tps->info[rid]->defdcdc_default)
 352                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
 353                 else
 354                         reg = TPS6507X_REG_DEFDCDC3_LOW;
 355                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
 356                 break;
 357         case TPS6507X_LDO_1:
 358                 reg = TPS6507X_REG_LDO_CTRL1;
 359                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
 360                 break;
 361         case TPS6507X_LDO_2:
 362                 reg = TPS6507X_REG_DEFLDO2;
 363                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
 364                 break;
 365         default:
 366                 return -EINVAL;
 367         }
 368
 369         data = tps6507x_pmic_reg_read(tps, reg);
 370         if (data < 0)
 371                 return data;
 372
 373         data &= ~mask;
 374         data |= selector;
 375
 376         return tps6507x_pmic_reg_write(tps, reg, data);
 377 }
 378
 379 static int tps6507x_pmic_list_voltage(struct regulator_dev *dev,
 380                                         unsigned selector)
 381 {
 382         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
 383         int rid = rdev_get_id(dev);
 384
 385         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
 386                 return -EINVAL;
 387
 388         if (selector >= tps->info[rid]->table_len)
 389                 return -EINVAL;
 390         else
 391                 return tps->info[rid]->table[selector] * 1000;
 392 }
 393
 394 static struct regulator_ops tps6507x_pmic_ops = {
 395         .is_enabled = tps6507x_pmic_is_enabled,
 396         .enable = tps6507x_pmic_enable,
 397         .disable = tps6507x_pmic_disable,
 398         .get_voltage = tps6507x_pmic_get_voltage,
 399         .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
 400         .list_voltage = tps6507x_pmic_list_voltage,
 401 };
 402
 403 static __devinit int tps6507x_pmic_probe(struct platform_device *pdev)
 404 {
 405         struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
 406         struct tps_info *info = &tps6507x_pmic_regs[0];
 407         struct regulator_init_data *init_data;
 408         struct regulator_dev *rdev;
 409         struct tps6507x_pmic *tps;
 410         struct tps6507x_board *tps_board;
 411         int i;
 412         int error;
 413
 414         /**
 415          * tps_board points to pmic related constants
 416          * coming from the board-evm file.
 417          */
 418
 419         tps_board = dev_get_platdata(tps6507x_dev->dev);
 420         if (!tps_board)
 421                 return -EINVAL;
 422
 423         /**
 424          * init_data points to array of regulator_init structures
 425          * coming from the board-evm file.
 426          */
 427         init_data = tps_board->tps6507x_pmic_init_data;
 428         if (!init_data)
 429                 return -EINVAL;
 430
 431         tps = kzalloc(sizeof(*tps), GFP_KERNEL);
 432         if (!tps)
 433                 return -ENOMEM;
 434
 435         mutex_init(&tps->io_lock);
 436
 437         /* common for all regulators */
 438         tps->mfd = tps6507x_dev;
 439
 440         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
 441                 /* Register the regulators */
 442                 tps->info[i] = info;
 443                 if (init_data->driver_data) {
 444                         struct tps6507x_reg_platform_data *data =
 445                                                         init_data->driver_data;
 446                         tps->info[i]->defdcdc_default = data->defdcdc_default;
 447                 }
 448
 449                 tps->desc[i].name = info->name;
 450                 tps->desc[i].id = i;
 451                 tps->desc[i].n_voltages = info->table_len;
 452                 tps->desc[i].ops = &tps6507x_pmic_ops;
 453                 tps->desc[i].type = REGULATOR_VOLTAGE;
 454                 tps->desc[i].owner = THIS_MODULE;
 455
 456                 rdev = regulator_register(&tps->desc[i],
 457                                         tps6507x_dev->dev, init_data, tps, NULL);
 458                 if (IS_ERR(rdev)) {
 459                         dev_err(tps6507x_dev->dev,
 460                                 "failed to register %s regulator\n",
 461                                 pdev->name);
 462                         error = PTR_ERR(rdev);
 463                         goto fail;
 464                 }
 465
 466                 /* Save regulator for cleanup */
 467                 tps->rdev[i] = rdev;
 468         }
 469
 470         tps6507x_dev->pmic = tps;
 471         platform_set_drvdata(pdev, tps6507x_dev);
 472
 473         return 0;
 474
 475 fail:
 476         while (--i >= 0)
 477                 regulator_unregister(tps->rdev[i]);
 478
 479         kfree(tps);
 480         return error;
 481 }
 482
 483 static int __devexit tps6507x_pmic_remove(struct platform_device *pdev)
 484 {
 485         struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
 486         struct tps6507x_pmic *tps = tps6507x_dev->pmic;
 487         int i;
 488
 489         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
 490                 regulator_unregister(tps->rdev[i]);
 491
 492         kfree(tps);
 493
 494         return 0;
 495 }
 496
 497 static struct platform_driver tps6507x_pmic_driver = {
 498         .driver = {
 499                 .name = "tps6507x-pmic",
 500                 .owner = THIS_MODULE,
 501         },
 502         .probe = tps6507x_pmic_probe,
 503         .remove = __devexit_p(tps6507x_pmic_remove),
 504 };
 505
 506 static int __init tps6507x_pmic_init(void)
 507 {
 508         return platform_driver_register(&tps6507x_pmic_driver);
 509 }
 510 subsys_initcall(tps6507x_pmic_init);
 511
 512 static void __exit tps6507x_pmic_cleanup(void)
 513 {
 514         platform_driver_unregister(&tps6507x_pmic_driver);
 515 }
 516 module_exit(tps6507x_pmic_cleanup);
 517
 518 MODULE_AUTHOR("Texas Instruments");
 519 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
 520 MODULE_LICENSE("GPL v2");
 521 MODULE_ALIAS("platform:tps6507x-pmic");