drivers/regulator/tps65023-regulator.c

   1 /*
   2  * tps65023-regulator.c
   3  *
   4  * Supports TPS65023 Regulator
   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/i2c.h>
  26 #include <linux/delay.h>
  27 #include <linux/slab.h>
  28 #include <linux/regmap.h>
  29
  30 /* Register definitions */
  31 #define TPS65023_REG_VERSION            0
  32 #define TPS65023_REG_PGOODZ             1
  33 #define TPS65023_REG_MASK               2
  34 #define TPS65023_REG_REG_CTRL           3
  35 #define TPS65023_REG_CON_CTRL           4
  36 #define TPS65023_REG_CON_CTRL2          5
  37 #define TPS65023_REG_DEF_CORE           6
  38 #define TPS65023_REG_DEFSLEW            7
  39 #define TPS65023_REG_LDO_CTRL           8
  40
  41 /* PGOODZ bitfields */
  42 #define TPS65023_PGOODZ_PWRFAILZ        BIT(7)
  43 #define TPS65023_PGOODZ_LOWBATTZ        BIT(6)
  44 #define TPS65023_PGOODZ_VDCDC1          BIT(5)
  45 #define TPS65023_PGOODZ_VDCDC2          BIT(4)
  46 #define TPS65023_PGOODZ_VDCDC3          BIT(3)
  47 #define TPS65023_PGOODZ_LDO2            BIT(2)
  48 #define TPS65023_PGOODZ_LDO1            BIT(1)
  49
  50 /* MASK bitfields */
  51 #define TPS65023_MASK_PWRFAILZ          BIT(7)
  52 #define TPS65023_MASK_LOWBATTZ          BIT(6)
  53 #define TPS65023_MASK_VDCDC1            BIT(5)
  54 #define TPS65023_MASK_VDCDC2            BIT(4)
  55 #define TPS65023_MASK_VDCDC3            BIT(3)
  56 #define TPS65023_MASK_LDO2              BIT(2)
  57 #define TPS65023_MASK_LDO1              BIT(1)
  58
  59 /* REG_CTRL bitfields */
  60 #define TPS65023_REG_CTRL_VDCDC1_EN     BIT(5)
  61 #define TPS65023_REG_CTRL_VDCDC2_EN     BIT(4)
  62 #define TPS65023_REG_CTRL_VDCDC3_EN     BIT(3)
  63 #define TPS65023_REG_CTRL_LDO2_EN       BIT(2)
  64 #define TPS65023_REG_CTRL_LDO1_EN       BIT(1)
  65
  66 /* LDO_CTRL bitfields */
  67 #define TPS65023_LDO_CTRL_LDOx_SHIFT(ldo_id)    ((ldo_id)*4)
  68 #define TPS65023_LDO_CTRL_LDOx_MASK(ldo_id)     (0xF0 >> ((ldo_id)*4))
  69
  70 /* Number of step-down converters available */
  71 #define TPS65023_NUM_DCDC               3
  72 /* Number of LDO voltage regulators  available */
  73 #define TPS65023_NUM_LDO                2
  74 /* Number of total regulators available */
  75 #define TPS65023_NUM_REGULATOR  (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)
  76
  77 /* DCDCs */
  78 #define TPS65023_DCDC_1                 0
  79 #define TPS65023_DCDC_2                 1
  80 #define TPS65023_DCDC_3                 2
  81 /* LDOs */
  82 #define TPS65023_LDO_1                  3
  83 #define TPS65023_LDO_2                  4
  84
  85 #define TPS65023_MAX_REG_ID             TPS65023_LDO_2
  86
  87 /* Supported voltage values for regulators */
  88 static const u16 VDCDC1_VSEL_table[] = {
  89         800, 825, 850, 875,
  90         900, 925, 950, 975,
  91         1000, 1025, 1050, 1075,
  92         1100, 1125, 1150, 1175,
  93         1200, 1225, 1250, 1275,
  94         1300, 1325, 1350, 1375,
  95         1400, 1425, 1450, 1475,
  96         1500, 1525, 1550, 1600,
  97 };
  98
  99 static const u16 LDO1_VSEL_table[] = {
 100         1000, 1100, 1300, 1800,
 101         2200, 2600, 2800, 3150,
 102 };
 103
 104 static const u16 LDO2_VSEL_table[] = {
 105         1050, 1200, 1300, 1800,
 106         2500, 2800, 3000, 3300,
 107 };
 108
 109 static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDC1_VSEL_table),
 110                                 0, 0, ARRAY_SIZE(LDO1_VSEL_table),
 111                                 ARRAY_SIZE(LDO2_VSEL_table)};
 112
 113 /* Regulator specific details */
 114 struct tps_info {
 115         const char *name;
 116         unsigned min_uV;
 117         unsigned max_uV;
 118         bool fixed;
 119         u8 table_len;
 120         const u16 *table;
 121 };
 122
 123 /* PMIC details */
 124 struct tps_pmic {
 125         struct regulator_desc desc[TPS65023_NUM_REGULATOR];
 126         struct i2c_client *client;
 127         struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
 128         const struct tps_info *info[TPS65023_NUM_REGULATOR];
 129         struct regmap *regmap;
 130 };
 131
 132 static int tps_65023_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
 133 {
 134         return regmap_update_bits(tps->regmap, reg, mask, mask);
 135 }
 136
 137 static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
 138 {
 139         return regmap_update_bits(tps->regmap, reg, mask, 0);
 140 }
 141
 142 static int tps_65023_reg_read(struct tps_pmic *tps, u8 reg)
 143 {
 144         unsigned int val;
 145         int ret;
 146
 147         ret = regmap_read(tps->regmap, reg, &val);
 148
 149         if (ret != 0)
 150                 return ret;
 151         else
 152                 return val;
 153 }
 154
 155 static int tps_65023_reg_write(struct tps_pmic *tps, u8 reg, u8 val)
 156 {
 157         return regmap_write(tps->regmap, reg, val);
 158 }
 159
 160 static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
 161 {
 162         struct tps_pmic *tps = rdev_get_drvdata(dev);
 163         int data, dcdc = rdev_get_id(dev);
 164         u8 shift;
 165
 166         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 167                 return -EINVAL;
 168
 169         shift = TPS65023_NUM_REGULATOR - dcdc;
 170         data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
 171
 172         if (data < 0)
 173                 return data;
 174         else
 175                 return (data & 1<<shift) ? 1 : 0;
 176 }
 177
 178 static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
 179 {
 180         struct tps_pmic *tps = rdev_get_drvdata(dev);
 181         int data, ldo = rdev_get_id(dev);
 182         u8 shift;
 183
 184         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 185                 return -EINVAL;
 186
 187         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 188         data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
 189
 190         if (data < 0)
 191                 return data;
 192         else
 193                 return (data & 1<<shift) ? 1 : 0;
 194 }
 195
 196 static int tps65023_dcdc_enable(struct regulator_dev *dev)
 197 {
 198         struct tps_pmic *tps = rdev_get_drvdata(dev);
 199         int dcdc = rdev_get_id(dev);
 200         u8 shift;
 201
 202         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 203                 return -EINVAL;
 204
 205         shift = TPS65023_NUM_REGULATOR - dcdc;
 206         return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
 207 }
 208
 209 static int tps65023_dcdc_disable(struct regulator_dev *dev)
 210 {
 211         struct tps_pmic *tps = rdev_get_drvdata(dev);
 212         int dcdc = rdev_get_id(dev);
 213         u8 shift;
 214
 215         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 216                 return -EINVAL;
 217
 218         shift = TPS65023_NUM_REGULATOR - dcdc;
 219         return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
 220 }
 221
 222 static int tps65023_ldo_enable(struct regulator_dev *dev)
 223 {
 224         struct tps_pmic *tps = rdev_get_drvdata(dev);
 225         int ldo = rdev_get_id(dev);
 226         u8 shift;
 227
 228         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 229                 return -EINVAL;
 230
 231         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 232         return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
 233 }
 234
 235 static int tps65023_ldo_disable(struct regulator_dev *dev)
 236 {
 237         struct tps_pmic *tps = rdev_get_drvdata(dev);
 238         int ldo = rdev_get_id(dev);
 239         u8 shift;
 240
 241         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 242                 return -EINVAL;
 243
 244         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 245         return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
 246 }
 247
 248 static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
 249 {
 250         struct tps_pmic *tps = rdev_get_drvdata(dev);
 251         int data, dcdc = rdev_get_id(dev);
 252
 253         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 254                 return -EINVAL;
 255
 256         if (dcdc == TPS65023_DCDC_1) {
 257                 data = tps_65023_reg_read(tps, TPS65023_REG_DEF_CORE);
 258                 if (data < 0)
 259                         return data;
 260                 data &= (tps->info[dcdc]->table_len - 1);
 261                 return tps->info[dcdc]->table[data] * 1000;
 262         } else
 263                 return tps->info[dcdc]->min_uV;
 264 }
 265
 266 static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
 267                                      int min_uV, int max_uV,
 268                                      unsigned *selector)
 269 {
 270         struct tps_pmic *tps = rdev_get_drvdata(dev);
 271         int dcdc = rdev_get_id(dev);
 272         int vsel;
 273
 274         if (dcdc != TPS65023_DCDC_1)
 275                 return -EINVAL;
 276
 277         if (min_uV < tps->info[dcdc]->min_uV
 278                         || min_uV > tps->info[dcdc]->max_uV)
 279                 return -EINVAL;
 280         if (max_uV < tps->info[dcdc]->min_uV
 281                         || max_uV > tps->info[dcdc]->max_uV)
 282                 return -EINVAL;
 283
 284         for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
 285                 int mV = tps->info[dcdc]->table[vsel];
 286                 int uV = mV * 1000;
 287
 288                 /* Break at the first in-range value */
 289                 if (min_uV <= uV && uV <= max_uV)
 290                         break;
 291         }
 292
 293         *selector = vsel;
 294
 295         /* write to the register in case we found a match */
 296         if (vsel == tps->info[dcdc]->table_len)
 297                 return -EINVAL;
 298         else
 299                 return tps_65023_reg_write(tps, TPS65023_REG_DEF_CORE, vsel);
 300 }
 301
 302 static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
 303 {
 304         struct tps_pmic *tps = rdev_get_drvdata(dev);
 305         int data, ldo = rdev_get_id(dev);
 306
 307         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 308                 return -EINVAL;
 309
 310         data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
 311         if (data < 0)
 312                 return data;
 313
 314         data >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
 315         data &= (tps->info[ldo]->table_len - 1);
 316         return tps->info[ldo]->table[data] * 1000;
 317 }
 318
 319 static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
 320                                     int min_uV, int max_uV, unsigned *selector)
 321 {
 322         struct tps_pmic *tps = rdev_get_drvdata(dev);
 323         int data, vsel, ldo = rdev_get_id(dev);
 324
 325         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 326                 return -EINVAL;
 327
 328         if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
 329                 return -EINVAL;
 330         if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
 331                 return -EINVAL;
 332
 333         for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
 334                 int mV = tps->info[ldo]->table[vsel];
 335                 int uV = mV * 1000;
 336
 337                 /* Break at the first in-range value */
 338                 if (min_uV <= uV && uV <= max_uV)
 339                         break;
 340         }
 341
 342         if (vsel == tps->info[ldo]->table_len)
 343                 return -EINVAL;
 344
 345         *selector = vsel;
 346
 347         data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
 348         if (data < 0)
 349                 return data;
 350
 351         data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
 352         data |= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
 353         return tps_65023_reg_write(tps, TPS65023_REG_LDO_CTRL, data);
 354 }
 355
 356 static int tps65023_dcdc_list_voltage(struct regulator_dev *dev,
 357                                         unsigned selector)
 358 {
 359         struct tps_pmic *tps = rdev_get_drvdata(dev);
 360         int dcdc = rdev_get_id(dev);
 361
 362         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 363                 return -EINVAL;
 364
 365         if (dcdc == TPS65023_DCDC_1) {
 366                 if (selector >= tps->info[dcdc]->table_len)
 367                         return -EINVAL;
 368                 else
 369                         return tps->info[dcdc]->table[selector] * 1000;
 370         } else
 371                 return tps->info[dcdc]->min_uV;
 372 }
 373
 374 static int tps65023_ldo_list_voltage(struct regulator_dev *dev,
 375                                         unsigned selector)
 376 {
 377         struct tps_pmic *tps = rdev_get_drvdata(dev);
 378         int ldo = rdev_get_id(dev);
 379
 380         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 381                 return -EINVAL;
 382
 383         if (selector >= tps->info[ldo]->table_len)
 384                 return -EINVAL;
 385         else
 386                 return tps->info[ldo]->table[selector] * 1000;
 387 }
 388
 389 /* Operations permitted on VDCDCx */
 390 static struct regulator_ops tps65023_dcdc_ops = {
 391         .is_enabled = tps65023_dcdc_is_enabled,
 392         .enable = tps65023_dcdc_enable,
 393         .disable = tps65023_dcdc_disable,
 394         .get_voltage = tps65023_dcdc_get_voltage,
 395         .set_voltage = tps65023_dcdc_set_voltage,
 396         .list_voltage = tps65023_dcdc_list_voltage,
 397 };
 398
 399 /* Operations permitted on LDOx */
 400 static struct regulator_ops tps65023_ldo_ops = {
 401         .is_enabled = tps65023_ldo_is_enabled,
 402         .enable = tps65023_ldo_enable,
 403         .disable = tps65023_ldo_disable,
 404         .get_voltage = tps65023_ldo_get_voltage,
 405         .set_voltage = tps65023_ldo_set_voltage,
 406         .list_voltage = tps65023_ldo_list_voltage,
 407 };
 408
 409 static struct regmap_config tps65023_regmap_config = {
 410         .reg_bits = 8,
 411         .val_bits = 8,
 412 };
 413
 414 static int __devinit tps_65023_probe(struct i2c_client *client,
 415                                      const struct i2c_device_id *id)
 416 {
 417         const struct tps_info *info = (void *)id->driver_data;
 418         struct regulator_init_data *init_data;
 419         struct regulator_dev *rdev;
 420         struct tps_pmic *tps;
 421         int i;
 422         int error;
 423
 424         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 425                 return -EIO;
 426
 427         /**
 428          * init_data points to array of regulator_init structures
 429          * coming from the board-evm file.
 430          */
 431         init_data = client->dev.platform_data;
 432         if (!init_data)
 433                 return -EIO;
 434
 435         tps = kzalloc(sizeof(*tps), GFP_KERNEL);
 436         if (!tps)
 437                 return -ENOMEM;
 438
 439         tps->regmap = regmap_init_i2c(client, &tps65023_regmap_config);
 440         if (IS_ERR(tps->regmap)) {
 441                 error = PTR_ERR(tps->regmap);
 442                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
 443                         error);
 444                 goto fail_alloc;
 445         }
 446
 447         /* common for all regulators */
 448         tps->client = client;
 449
 450         for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
 451                 /* Store regulator specific information */
 452                 tps->info[i] = info;
 453
 454                 tps->desc[i].name = info->name;
 455                 tps->desc[i].id = i;
 456                 tps->desc[i].n_voltages = num_voltages[i];
 457                 tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
 458                                         &tps65023_ldo_ops : &tps65023_dcdc_ops);
 459                 tps->desc[i].type = REGULATOR_VOLTAGE;
 460                 tps->desc[i].owner = THIS_MODULE;
 461
 462                 /* Register the regulators */
 463                 rdev = regulator_register(&tps->desc[i], &client->dev,
 464                                           init_data, tps);
 465                 if (IS_ERR(rdev)) {
 466                         dev_err(&client->dev, "failed to register %s\n",
 467                                 id->name);
 468                         error = PTR_ERR(rdev);
 469                         goto fail;
 470                 }
 471
 472                 /* Save regulator for cleanup */
 473                 tps->rdev[i] = rdev;
 474         }
 475
 476         i2c_set_clientdata(client, tps);
 477
 478         return 0;
 479
 480  fail:
 481         while (--i >= 0)
 482                 regulator_unregister(tps->rdev[i]);
 483
 484         regmap_exit(tps->regmap);
 485  fail_alloc:
 486         kfree(tps);
 487         return error;
 488 }
 489
 490 /**
 491  * tps_65023_remove - TPS65023 driver i2c remove handler
 492  * @client: i2c driver client device structure
 493  *
 494  * Unregister TPS driver as an i2c client device driver
 495  */
 496 static int __devexit tps_65023_remove(struct i2c_client *client)
 497 {
 498         struct tps_pmic *tps = i2c_get_clientdata(client);
 499         int i;
 500
 501         for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
 502                 regulator_unregister(tps->rdev[i]);
 503
 504         regmap_exit(tps->regmap);
 505         kfree(tps);
 506
 507         return 0;
 508 }
 509
 510 static const struct tps_info tps65023_regs[] = {
 511         {
 512                 .name = "VDCDC1",
 513                 .min_uV =  800000,
 514                 .max_uV = 1600000,
 515                 .table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
 516                 .table = VDCDC1_VSEL_table,
 517         },
 518         {
 519                 .name = "VDCDC2",
 520                 .min_uV =  3300000,
 521                 .max_uV = 3300000,
 522                 .fixed = 1,
 523         },
 524         {
 525                 .name = "VDCDC3",
 526                 .min_uV =  1800000,
 527                 .max_uV = 1800000,
 528                 .fixed = 1,
 529         },
 530         {
 531                 .name = "LDO1",
 532                 .min_uV = 1000000,
 533                 .max_uV = 3150000,
 534                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
 535                 .table = LDO1_VSEL_table,
 536         },
 537         {
 538                 .name = "LDO2",
 539                 .min_uV = 1050000,
 540                 .max_uV = 3300000,
 541                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
 542                 .table = LDO2_VSEL_table,
 543         },
 544 };
 545
 546 static const struct i2c_device_id tps_65023_id[] = {
 547         {.name = "tps65023",
 548         .driver_data = (unsigned long) tps65023_regs,},
 549         {.name = "tps65021",
 550         .driver_data = (unsigned long) tps65023_regs,},
 551         { },
 552 };
 553
 554 MODULE_DEVICE_TABLE(i2c, tps_65023_id);
 555
 556 static struct i2c_driver tps_65023_i2c_driver = {
 557         .driver = {
 558                 .name = "tps65023",
 559                 .owner = THIS_MODULE,
 560         },
 561         .probe = tps_65023_probe,
 562         .remove = __devexit_p(tps_65023_remove),
 563         .id_table = tps_65023_id,
 564 };
 565
 566 /**
 567  * tps_65023_init
 568  *
 569  * Module init function
 570  */
 571 static int __init tps_65023_init(void)
 572 {
 573         return i2c_add_driver(&tps_65023_i2c_driver);
 574 }
 575 subsys_initcall(tps_65023_init);
 576
 577 /**
 578  * tps_65023_cleanup
 579  *
 580  * Module exit function
 581  */
 582 static void __exit tps_65023_cleanup(void)
 583 {
 584         i2c_del_driver(&tps_65023_i2c_driver);
 585 }
 586 module_exit(tps_65023_cleanup);
 587
 588 MODULE_AUTHOR("Texas Instruments");
 589 MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
 590 MODULE_LICENSE("GPL v2");