linux/drivers/regulator/tps65023-regulator.c
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   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/slab.h>
  27#include <linux/regmap.h>
  28
  29/* Register definitions */
  30#define TPS65023_REG_VERSION            0
  31#define TPS65023_REG_PGOODZ             1
  32#define TPS65023_REG_MASK               2
  33#define TPS65023_REG_REG_CTRL           3
  34#define TPS65023_REG_CON_CTRL           4
  35#define TPS65023_REG_CON_CTRL2          5
  36#define TPS65023_REG_DEF_CORE           6
  37#define TPS65023_REG_DEFSLEW            7
  38#define TPS65023_REG_LDO_CTRL           8
  39
  40/* PGOODZ bitfields */
  41#define TPS65023_PGOODZ_PWRFAILZ        BIT(7)
  42#define TPS65023_PGOODZ_LOWBATTZ        BIT(6)
  43#define TPS65023_PGOODZ_VDCDC1          BIT(5)
  44#define TPS65023_PGOODZ_VDCDC2          BIT(4)
  45#define TPS65023_PGOODZ_VDCDC3          BIT(3)
  46#define TPS65023_PGOODZ_LDO2            BIT(2)
  47#define TPS65023_PGOODZ_LDO1            BIT(1)
  48
  49/* MASK bitfields */
  50#define TPS65023_MASK_PWRFAILZ          BIT(7)
  51#define TPS65023_MASK_LOWBATTZ          BIT(6)
  52#define TPS65023_MASK_VDCDC1            BIT(5)
  53#define TPS65023_MASK_VDCDC2            BIT(4)
  54#define TPS65023_MASK_VDCDC3            BIT(3)
  55#define TPS65023_MASK_LDO2              BIT(2)
  56#define TPS65023_MASK_LDO1              BIT(1)
  57
  58/* REG_CTRL bitfields */
  59#define TPS65023_REG_CTRL_VDCDC1_EN     BIT(5)
  60#define TPS65023_REG_CTRL_VDCDC2_EN     BIT(4)
  61#define TPS65023_REG_CTRL_VDCDC3_EN     BIT(3)
  62#define TPS65023_REG_CTRL_LDO2_EN       BIT(2)
  63#define TPS65023_REG_CTRL_LDO1_EN       BIT(1)
  64
  65/* REG_CTRL2 bitfields */
  66#define TPS65023_REG_CTRL2_GO           BIT(7)
  67#define TPS65023_REG_CTRL2_CORE_ADJ     BIT(6)
  68#define TPS65023_REG_CTRL2_DCDC2        BIT(2)
  69#define TPS65023_REG_CTRL2_DCDC1        BIT(1)
  70#define TPS65023_REG_CTRL2_DCDC3        BIT(0)
  71
  72/* Number of step-down converters available */
  73#define TPS65023_NUM_DCDC               3
  74/* Number of LDO voltage regulators  available */
  75#define TPS65023_NUM_LDO                2
  76/* Number of total regulators available */
  77#define TPS65023_NUM_REGULATOR  (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)
  78
  79/* DCDCs */
  80#define TPS65023_DCDC_1                 0
  81#define TPS65023_DCDC_2                 1
  82#define TPS65023_DCDC_3                 2
  83/* LDOs */
  84#define TPS65023_LDO_1                  3
  85#define TPS65023_LDO_2                  4
  86
  87#define TPS65023_MAX_REG_ID             TPS65023_LDO_2
  88
  89/* Supported voltage values for regulators */
  90static const unsigned int VCORE_VSEL_table[] = {
  91        800000, 825000, 850000, 875000,
  92        900000, 925000, 950000, 975000,
  93        1000000, 1025000, 1050000, 1075000,
  94        1100000, 1125000, 1150000, 1175000,
  95        1200000, 1225000, 1250000, 1275000,
  96        1300000, 1325000, 1350000, 1375000,
  97        1400000, 1425000, 1450000, 1475000,
  98        1500000, 1525000, 1550000, 1600000,
  99};
 100
 101static const unsigned int DCDC_FIXED_3300000_VSEL_table[] = {
 102        3300000,
 103};
 104
 105static const unsigned int DCDC_FIXED_1800000_VSEL_table[] = {
 106        1800000,
 107};
 108
 109/* Supported voltage values for LDO regulators for tps65020 */
 110static const unsigned int TPS65020_LDO1_VSEL_table[] = {
 111        1000000, 1050000, 1100000, 1300000,
 112        1800000, 2500000, 3000000, 3300000,
 113};
 114
 115static const unsigned int TPS65020_LDO2_VSEL_table[] = {
 116        1000000, 1050000, 1100000, 1300000,
 117        1800000, 2500000, 3000000, 3300000,
 118};
 119
 120/* Supported voltage values for LDO regulators
 121 * for tps65021 and tps65023 */
 122static const unsigned int TPS65023_LDO1_VSEL_table[] = {
 123        1000000, 1100000, 1300000, 1800000,
 124        2200000, 2600000, 2800000, 3150000,
 125};
 126
 127static const unsigned int TPS65023_LDO2_VSEL_table[] = {
 128        1050000, 1200000, 1300000, 1800000,
 129        2500000, 2800000, 3000000, 3300000,
 130};
 131
 132/* Regulator specific details */
 133struct tps_info {
 134        const char *name;
 135        u8 table_len;
 136        const unsigned int *table;
 137};
 138
 139/* PMIC details */
 140struct tps_pmic {
 141        struct regulator_desc desc[TPS65023_NUM_REGULATOR];
 142        struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
 143        const struct tps_info *info[TPS65023_NUM_REGULATOR];
 144        struct regmap *regmap;
 145        u8 core_regulator;
 146};
 147
 148/* Struct passed as driver data */
 149struct tps_driver_data {
 150        const struct tps_info *info;
 151        u8 core_regulator;
 152};
 153
 154static int tps65023_dcdc_get_voltage_sel(struct regulator_dev *dev)
 155{
 156        struct tps_pmic *tps = rdev_get_drvdata(dev);
 157        int ret;
 158        int data, dcdc = rdev_get_id(dev);
 159
 160        if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 161                return -EINVAL;
 162
 163        if (dcdc == tps->core_regulator) {
 164                ret = regmap_read(tps->regmap, TPS65023_REG_DEF_CORE, &data);
 165                if (ret != 0)
 166                        return ret;
 167                data &= (tps->info[dcdc]->table_len - 1);
 168                return data;
 169        } else
 170                return 0;
 171}
 172
 173static int tps65023_dcdc_set_voltage_sel(struct regulator_dev *dev,
 174                                         unsigned selector)
 175{
 176        struct tps_pmic *tps = rdev_get_drvdata(dev);
 177        int dcdc = rdev_get_id(dev);
 178        int ret;
 179
 180        if (dcdc != tps->core_regulator)
 181                return -EINVAL;
 182
 183        ret = regmap_write(tps->regmap, TPS65023_REG_DEF_CORE, selector);
 184        if (ret)
 185                goto out;
 186
 187        /* Tell the chip that we have changed the value in DEFCORE
 188         * and its time to update the core voltage
 189         */
 190        ret = regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
 191                                 TPS65023_REG_CTRL2_GO, TPS65023_REG_CTRL2_GO);
 192
 193out:
 194        return ret;
 195}
 196
 197/* Operations permitted on VDCDCx */
 198static struct regulator_ops tps65023_dcdc_ops = {
 199        .is_enabled = regulator_is_enabled_regmap,
 200        .enable = regulator_enable_regmap,
 201        .disable = regulator_disable_regmap,
 202        .get_voltage_sel = tps65023_dcdc_get_voltage_sel,
 203        .set_voltage_sel = tps65023_dcdc_set_voltage_sel,
 204        .list_voltage = regulator_list_voltage_table,
 205};
 206
 207/* Operations permitted on LDOx */
 208static struct regulator_ops tps65023_ldo_ops = {
 209        .is_enabled = regulator_is_enabled_regmap,
 210        .enable = regulator_enable_regmap,
 211        .disable = regulator_disable_regmap,
 212        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 213        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 214        .list_voltage = regulator_list_voltage_table,
 215};
 216
 217static struct regmap_config tps65023_regmap_config = {
 218        .reg_bits = 8,
 219        .val_bits = 8,
 220};
 221
 222static int tps_65023_probe(struct i2c_client *client,
 223                                     const struct i2c_device_id *id)
 224{
 225        const struct tps_driver_data *drv_data = (void *)id->driver_data;
 226        const struct tps_info *info = drv_data->info;
 227        struct regulator_config config = { };
 228        struct regulator_init_data *init_data;
 229        struct regulator_dev *rdev;
 230        struct tps_pmic *tps;
 231        int i;
 232        int error;
 233
 234        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 235                return -EIO;
 236
 237        /**
 238         * init_data points to array of regulator_init structures
 239         * coming from the board-evm file.
 240         */
 241        init_data = client->dev.platform_data;
 242        if (!init_data)
 243                return -EIO;
 244
 245        tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 246        if (!tps)
 247                return -ENOMEM;
 248
 249        tps->regmap = devm_regmap_init_i2c(client, &tps65023_regmap_config);
 250        if (IS_ERR(tps->regmap)) {
 251                error = PTR_ERR(tps->regmap);
 252                dev_err(&client->dev, "Failed to allocate register map: %d\n",
 253                        error);
 254                return error;
 255        }
 256
 257        /* common for all regulators */
 258        tps->core_regulator = drv_data->core_regulator;
 259
 260        for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
 261                /* Store regulator specific information */
 262                tps->info[i] = info;
 263
 264                tps->desc[i].name = info->name;
 265                tps->desc[i].id = i;
 266                tps->desc[i].n_voltages = info->table_len;
 267                tps->desc[i].volt_table = info->table;
 268                tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
 269                                        &tps65023_ldo_ops : &tps65023_dcdc_ops);
 270                tps->desc[i].type = REGULATOR_VOLTAGE;
 271                tps->desc[i].owner = THIS_MODULE;
 272
 273                tps->desc[i].enable_reg = TPS65023_REG_REG_CTRL;
 274                switch (i) {
 275                case TPS65023_LDO_1:
 276                        tps->desc[i].vsel_reg = TPS65023_REG_LDO_CTRL;
 277                        tps->desc[i].vsel_mask = 0x07;
 278                        tps->desc[i].enable_mask = 1 << 1;
 279                        break;
 280                case TPS65023_LDO_2:
 281                        tps->desc[i].vsel_reg = TPS65023_REG_LDO_CTRL;
 282                        tps->desc[i].vsel_mask = 0x70;
 283                        tps->desc[i].enable_mask = 1 << 2;
 284                        break;
 285                default: /* DCDCx */
 286                        tps->desc[i].enable_mask =
 287                                        1 << (TPS65023_NUM_REGULATOR - i);
 288                }
 289
 290                config.dev = &client->dev;
 291                config.init_data = init_data;
 292                config.driver_data = tps;
 293                config.regmap = tps->regmap;
 294
 295                /* Register the regulators */
 296                rdev = regulator_register(&tps->desc[i], &config);
 297                if (IS_ERR(rdev)) {
 298                        dev_err(&client->dev, "failed to register %s\n",
 299                                id->name);
 300                        error = PTR_ERR(rdev);
 301                        goto fail;
 302                }
 303
 304                /* Save regulator for cleanup */
 305                tps->rdev[i] = rdev;
 306        }
 307
 308        i2c_set_clientdata(client, tps);
 309
 310        /* Enable setting output voltage by I2C */
 311        regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
 312                        TPS65023_REG_CTRL2_CORE_ADJ, TPS65023_REG_CTRL2_CORE_ADJ);
 313
 314        return 0;
 315
 316 fail:
 317        while (--i >= 0)
 318                regulator_unregister(tps->rdev[i]);
 319        return error;
 320}
 321
 322static int tps_65023_remove(struct i2c_client *client)
 323{
 324        struct tps_pmic *tps = i2c_get_clientdata(client);
 325        int i;
 326
 327        for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
 328                regulator_unregister(tps->rdev[i]);
 329        return 0;
 330}
 331
 332static const struct tps_info tps65020_regs[] = {
 333        {
 334                .name = "VDCDC1",
 335                .table_len = ARRAY_SIZE(DCDC_FIXED_3300000_VSEL_table),
 336                .table = DCDC_FIXED_3300000_VSEL_table,
 337        },
 338        {
 339                .name = "VDCDC2",
 340                .table_len = ARRAY_SIZE(DCDC_FIXED_1800000_VSEL_table),
 341                .table = DCDC_FIXED_1800000_VSEL_table,
 342        },
 343        {
 344                .name = "VDCDC3",
 345                .table_len = ARRAY_SIZE(VCORE_VSEL_table),
 346                .table = VCORE_VSEL_table,
 347        },
 348        {
 349                .name = "LDO1",
 350                .table_len = ARRAY_SIZE(TPS65020_LDO1_VSEL_table),
 351                .table = TPS65020_LDO1_VSEL_table,
 352        },
 353        {
 354                .name = "LDO2",
 355                .table_len = ARRAY_SIZE(TPS65020_LDO2_VSEL_table),
 356                .table = TPS65020_LDO2_VSEL_table,
 357        },
 358};
 359
 360static const struct tps_info tps65021_regs[] = {
 361        {
 362                .name = "VDCDC1",
 363                .table_len = ARRAY_SIZE(DCDC_FIXED_3300000_VSEL_table),
 364                .table = DCDC_FIXED_3300000_VSEL_table,
 365        },
 366        {
 367                .name = "VDCDC2",
 368                .table_len = ARRAY_SIZE(DCDC_FIXED_1800000_VSEL_table),
 369                .table = DCDC_FIXED_1800000_VSEL_table,
 370        },
 371        {
 372                .name = "VDCDC3",
 373                .table_len = ARRAY_SIZE(VCORE_VSEL_table),
 374                .table = VCORE_VSEL_table,
 375        },
 376        {
 377                .name = "LDO1",
 378                .table_len = ARRAY_SIZE(TPS65023_LDO1_VSEL_table),
 379                .table = TPS65023_LDO1_VSEL_table,
 380        },
 381        {
 382                .name = "LDO2",
 383                .table_len = ARRAY_SIZE(TPS65023_LDO2_VSEL_table),
 384                .table = TPS65023_LDO2_VSEL_table,
 385        },
 386};
 387
 388static const struct tps_info tps65023_regs[] = {
 389        {
 390                .name = "VDCDC1",
 391                .table_len = ARRAY_SIZE(VCORE_VSEL_table),
 392                .table = VCORE_VSEL_table,
 393        },
 394        {
 395                .name = "VDCDC2",
 396                .table_len = ARRAY_SIZE(DCDC_FIXED_3300000_VSEL_table),
 397                .table = DCDC_FIXED_3300000_VSEL_table,
 398        },
 399        {
 400                .name = "VDCDC3",
 401                .table_len = ARRAY_SIZE(DCDC_FIXED_1800000_VSEL_table),
 402                .table = DCDC_FIXED_1800000_VSEL_table,
 403        },
 404        {
 405                .name = "LDO1",
 406                .table_len = ARRAY_SIZE(TPS65023_LDO1_VSEL_table),
 407                .table = TPS65023_LDO1_VSEL_table,
 408        },
 409        {
 410                .name = "LDO2",
 411                .table_len = ARRAY_SIZE(TPS65023_LDO2_VSEL_table),
 412                .table = TPS65023_LDO2_VSEL_table,
 413        },
 414};
 415
 416static struct tps_driver_data tps65020_drv_data = {
 417        .info = tps65020_regs,
 418        .core_regulator = TPS65023_DCDC_3,
 419};
 420
 421static struct tps_driver_data tps65021_drv_data = {
 422        .info = tps65021_regs,
 423        .core_regulator = TPS65023_DCDC_3,
 424};
 425
 426static struct tps_driver_data tps65023_drv_data = {
 427        .info = tps65023_regs,
 428        .core_regulator = TPS65023_DCDC_1,
 429};
 430
 431static const struct i2c_device_id tps_65023_id[] = {
 432        {.name = "tps65023",
 433        .driver_data = (unsigned long) &tps65023_drv_data},
 434        {.name = "tps65021",
 435        .driver_data = (unsigned long) &tps65021_drv_data,},
 436        {.name = "tps65020",
 437        .driver_data = (unsigned long) &tps65020_drv_data},
 438        { },
 439};
 440
 441MODULE_DEVICE_TABLE(i2c, tps_65023_id);
 442
 443static struct i2c_driver tps_65023_i2c_driver = {
 444        .driver = {
 445                .name = "tps65023",
 446                .owner = THIS_MODULE,
 447        },
 448        .probe = tps_65023_probe,
 449        .remove = tps_65023_remove,
 450        .id_table = tps_65023_id,
 451};
 452
 453static int __init tps_65023_init(void)
 454{
 455        return i2c_add_driver(&tps_65023_i2c_driver);
 456}
 457subsys_initcall(tps_65023_init);
 458
 459static void __exit tps_65023_cleanup(void)
 460{
 461        i2c_del_driver(&tps_65023_i2c_driver);
 462}
 463module_exit(tps_65023_cleanup);
 464
 465MODULE_AUTHOR("Texas Instruments");
 466MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
 467MODULE_LICENSE("GPL v2");
 468
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