linux/drivers/regulator/tps65217-regulator.c
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   1/*
   2 * tps65217-regulator.c
   3 *
   4 * Regulator driver for TPS65217 PMIC
   5 *
   6 * Copyright (C) 2011 Texas Instruments 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
  13 * kind, whether express or implied; without even the implied warranty
  14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 */
  17
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/device.h>
  21#include <linux/init.h>
  22#include <linux/err.h>
  23#include <linux/platform_device.h>
  24
  25#include <linux/regulator/of_regulator.h>
  26#include <linux/regulator/driver.h>
  27#include <linux/regulator/machine.h>
  28#include <linux/mfd/tps65217.h>
  29
  30#define TPS65217_REGULATOR(_name, _id, _ops, _n, _vr, _vm, _em, _t) \
  31        {                                               \
  32                .name           = _name,                \
  33                .id             = _id,                  \
  34                .ops            = &_ops,                \
  35                .n_voltages     = _n,                   \
  36                .type           = REGULATOR_VOLTAGE,    \
  37                .owner          = THIS_MODULE,          \
  38                .vsel_reg       = _vr,                  \
  39                .vsel_mask      = _vm,                  \
  40                .enable_reg     = TPS65217_REG_ENABLE,  \
  41                .enable_mask    = _em,                  \
  42                .volt_table     = _t,                   \
  43        }                                               \
  44
  45#define TPS65217_INFO(_nm, _min, _max, _f1, _f2)        \
  46        {                                               \
  47                .name           = _nm,                  \
  48                .min_uV         = _min,                 \
  49                .max_uV         = _max,                 \
  50                .vsel_to_uv     = _f1,                  \
  51                .uv_to_vsel     = _f2,                  \
  52        }
  53
  54static const unsigned int LDO1_VSEL_table[] = {
  55        1000000, 1100000, 1200000, 1250000,
  56        1300000, 1350000, 1400000, 1500000,
  57        1600000, 1800000, 2500000, 2750000,
  58        2800000, 3000000, 3100000, 3300000,
  59};
  60
  61static int tps65217_vsel_to_uv1(unsigned int vsel)
  62{
  63        int uV = 0;
  64
  65        if (vsel > 63)
  66                return -EINVAL;
  67
  68        if (vsel <= 24)
  69                uV = vsel * 25000 + 900000;
  70        else if (vsel <= 52)
  71                uV = (vsel - 24) * 50000 + 1500000;
  72        else if (vsel < 56)
  73                uV = (vsel - 52) * 100000 + 2900000;
  74        else
  75                uV = 3300000;
  76
  77        return uV;
  78}
  79
  80static int tps65217_uv_to_vsel1(int uV, unsigned int *vsel)
  81{
  82        if (uV < 0 || uV > 3300000)
  83                return -EINVAL;
  84
  85        if (uV <= 1500000)
  86                *vsel = DIV_ROUND_UP(uV - 900000, 25000);
  87        else if (uV <= 2900000)
  88                *vsel = 24 + DIV_ROUND_UP(uV - 1500000, 50000);
  89        else if (uV < 3300000)
  90                *vsel = 52 + DIV_ROUND_UP(uV - 2900000, 100000);
  91        else
  92                *vsel = 56;
  93
  94        return 0;
  95}
  96
  97static int tps65217_vsel_to_uv2(unsigned int vsel)
  98{
  99        int uV = 0;
 100
 101        if (vsel > 31)
 102                return -EINVAL;
 103
 104        if (vsel <= 8)
 105                uV = vsel * 50000 + 1500000;
 106        else if (vsel <= 13)
 107                uV = (vsel - 8) * 100000 + 1900000;
 108        else
 109                uV = (vsel - 13) * 50000 + 2400000;
 110
 111        return uV;
 112}
 113
 114static int tps65217_uv_to_vsel2(int uV, unsigned int *vsel)
 115{
 116        if (uV < 0 || uV > 3300000)
 117                return -EINVAL;
 118
 119        if (uV <= 1900000)
 120                *vsel = DIV_ROUND_UP(uV - 1500000, 50000);
 121        else if (uV <= 2400000)
 122                *vsel = 8 + DIV_ROUND_UP(uV - 1900000, 100000);
 123        else
 124                *vsel = 13 + DIV_ROUND_UP(uV - 2400000, 50000);
 125
 126        return 0;
 127}
 128
 129static struct tps_info tps65217_pmic_regs[] = {
 130        TPS65217_INFO("DCDC1", 900000, 1800000, tps65217_vsel_to_uv1,
 131                        tps65217_uv_to_vsel1),
 132        TPS65217_INFO("DCDC2", 900000, 3300000, tps65217_vsel_to_uv1,
 133                        tps65217_uv_to_vsel1),
 134        TPS65217_INFO("DCDC3", 900000, 1500000, tps65217_vsel_to_uv1,
 135                        tps65217_uv_to_vsel1),
 136        TPS65217_INFO("LDO1", 1000000, 3300000, NULL, NULL),
 137        TPS65217_INFO("LDO2", 900000, 3300000, tps65217_vsel_to_uv1,
 138                        tps65217_uv_to_vsel1),
 139        TPS65217_INFO("LDO3", 1800000, 3300000, tps65217_vsel_to_uv2,
 140                        tps65217_uv_to_vsel2),
 141        TPS65217_INFO("LDO4", 1800000, 3300000, tps65217_vsel_to_uv2,
 142                        tps65217_uv_to_vsel2),
 143};
 144
 145static int tps65217_pmic_enable(struct regulator_dev *dev)
 146{
 147        struct tps65217 *tps = rdev_get_drvdata(dev);
 148        unsigned int rid = rdev_get_id(dev);
 149
 150        if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 151                return -EINVAL;
 152
 153        /* Enable the regulator and password protection is level 1 */
 154        return tps65217_set_bits(tps, TPS65217_REG_ENABLE,
 155                                 dev->desc->enable_mask, dev->desc->enable_mask,
 156                                 TPS65217_PROTECT_L1);
 157}
 158
 159static int tps65217_pmic_disable(struct regulator_dev *dev)
 160{
 161        struct tps65217 *tps = rdev_get_drvdata(dev);
 162        unsigned int rid = rdev_get_id(dev);
 163
 164        if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 165                return -EINVAL;
 166
 167        /* Disable the regulator and password protection is level 1 */
 168        return tps65217_clear_bits(tps, TPS65217_REG_ENABLE,
 169                                   dev->desc->enable_mask, TPS65217_PROTECT_L1);
 170}
 171
 172static int tps65217_pmic_set_voltage_sel(struct regulator_dev *dev,
 173                                         unsigned selector)
 174{
 175        int ret;
 176        struct tps65217 *tps = rdev_get_drvdata(dev);
 177        unsigned int rid = rdev_get_id(dev);
 178
 179        /* Set the voltage based on vsel value and write protect level is 2 */
 180        ret = tps65217_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
 181                                selector, TPS65217_PROTECT_L2);
 182
 183        /* Set GO bit for DCDCx to initiate voltage transistion */
 184        switch (rid) {
 185        case TPS65217_DCDC_1 ... TPS65217_DCDC_3:
 186                ret = tps65217_set_bits(tps, TPS65217_REG_DEFSLEW,
 187                                       TPS65217_DEFSLEW_GO, TPS65217_DEFSLEW_GO,
 188                                       TPS65217_PROTECT_L2);
 189                break;
 190        }
 191
 192        return ret;
 193}
 194
 195static int tps65217_pmic_map_voltage(struct regulator_dev *dev,
 196                                     int min_uV, int max_uV)
 197{
 198
 199        struct tps65217 *tps = rdev_get_drvdata(dev);
 200        unsigned int sel, rid = rdev_get_id(dev);
 201        int ret;
 202
 203        /* LDO1 uses regulator_map_voltage_iterate() */
 204        if (rid == TPS65217_LDO_1)
 205                return -EINVAL;
 206
 207        if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 208                return -EINVAL;
 209
 210        if (min_uV < tps->info[rid]->min_uV)
 211                min_uV = tps->info[rid]->min_uV;
 212
 213        if (max_uV < tps->info[rid]->min_uV || min_uV > tps->info[rid]->max_uV)
 214                return -EINVAL;
 215
 216        ret = tps->info[rid]->uv_to_vsel(min_uV, &sel);
 217        if (ret)
 218                return ret;
 219
 220        return sel;
 221}
 222
 223static int tps65217_pmic_list_voltage(struct regulator_dev *dev,
 224                                        unsigned selector)
 225{
 226        struct tps65217 *tps = rdev_get_drvdata(dev);
 227        unsigned int rid = rdev_get_id(dev);
 228
 229        if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 230                return -EINVAL;
 231
 232        if (selector >= dev->desc->n_voltages)
 233                return -EINVAL;
 234
 235        return tps->info[rid]->vsel_to_uv(selector);
 236}
 237
 238/* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
 239static struct regulator_ops tps65217_pmic_ops = {
 240        .is_enabled             = regulator_is_enabled_regmap,
 241        .enable                 = tps65217_pmic_enable,
 242        .disable                = tps65217_pmic_disable,
 243        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 244        .set_voltage_sel        = tps65217_pmic_set_voltage_sel,
 245        .list_voltage           = tps65217_pmic_list_voltage,
 246        .map_voltage            = tps65217_pmic_map_voltage,
 247};
 248
 249/* Operations permitted on LDO1 */
 250static struct regulator_ops tps65217_pmic_ldo1_ops = {
 251        .is_enabled             = regulator_is_enabled_regmap,
 252        .enable                 = tps65217_pmic_enable,
 253        .disable                = tps65217_pmic_disable,
 254        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 255        .set_voltage_sel        = tps65217_pmic_set_voltage_sel,
 256        .list_voltage           = regulator_list_voltage_table,
 257};
 258
 259static const struct regulator_desc regulators[] = {
 260        TPS65217_REGULATOR("DCDC1", TPS65217_DCDC_1, tps65217_pmic_ops, 64,
 261                           TPS65217_REG_DEFDCDC1, TPS65217_DEFDCDCX_DCDC_MASK,
 262                           TPS65217_ENABLE_DC1_EN, NULL),
 263        TPS65217_REGULATOR("DCDC2", TPS65217_DCDC_2, tps65217_pmic_ops, 64,
 264                           TPS65217_REG_DEFDCDC2, TPS65217_DEFDCDCX_DCDC_MASK,
 265                           TPS65217_ENABLE_DC2_EN, NULL),
 266        TPS65217_REGULATOR("DCDC3", TPS65217_DCDC_3, tps65217_pmic_ops, 64,
 267                           TPS65217_REG_DEFDCDC3, TPS65217_DEFDCDCX_DCDC_MASK,
 268                           TPS65217_ENABLE_DC3_EN, NULL),
 269        TPS65217_REGULATOR("LDO1", TPS65217_LDO_1, tps65217_pmic_ldo1_ops, 16,
 270                           TPS65217_REG_DEFLDO1, TPS65217_DEFLDO1_LDO1_MASK,
 271                           TPS65217_ENABLE_LDO1_EN, LDO1_VSEL_table),
 272        TPS65217_REGULATOR("LDO2", TPS65217_LDO_2, tps65217_pmic_ops, 64,
 273                           TPS65217_REG_DEFLDO2, TPS65217_DEFLDO2_LDO2_MASK,
 274                           TPS65217_ENABLE_LDO2_EN, NULL),
 275        TPS65217_REGULATOR("LDO3", TPS65217_LDO_3, tps65217_pmic_ops, 32,
 276                           TPS65217_REG_DEFLS1, TPS65217_DEFLDO3_LDO3_MASK,
 277                           TPS65217_ENABLE_LS1_EN | TPS65217_DEFLDO3_LDO3_EN,
 278                           NULL),
 279        TPS65217_REGULATOR("LDO4", TPS65217_LDO_4, tps65217_pmic_ops, 32,
 280                           TPS65217_REG_DEFLS2, TPS65217_DEFLDO4_LDO4_MASK,
 281                           TPS65217_ENABLE_LS2_EN | TPS65217_DEFLDO4_LDO4_EN,
 282                           NULL),
 283};
 284
 285#ifdef CONFIG_OF
 286static struct of_regulator_match reg_matches[] = {
 287        { .name = "dcdc1", .driver_data = (void *)TPS65217_DCDC_1 },
 288        { .name = "dcdc2", .driver_data = (void *)TPS65217_DCDC_2 },
 289        { .name = "dcdc3", .driver_data = (void *)TPS65217_DCDC_3 },
 290        { .name = "ldo1", .driver_data = (void *)TPS65217_LDO_1 },
 291        { .name = "ldo2", .driver_data = (void *)TPS65217_LDO_2 },
 292        { .name = "ldo3", .driver_data = (void *)TPS65217_LDO_3 },
 293        { .name = "ldo4", .driver_data = (void *)TPS65217_LDO_4 },
 294};
 295
 296static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
 297{
 298        struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
 299        struct device_node *node = tps->dev->of_node;
 300        struct tps65217_board *pdata;
 301        struct device_node *regs;
 302        int i, count;
 303
 304        regs = of_find_node_by_name(node, "regulators");
 305        if (!regs)
 306                return NULL;
 307
 308        count = of_regulator_match(&pdev->dev, regs, reg_matches,
 309                                   TPS65217_NUM_REGULATOR);
 310        of_node_put(regs);
 311        if ((count < 0) || (count > TPS65217_NUM_REGULATOR))
 312                return NULL;
 313
 314        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 315        if (!pdata)
 316                return NULL;
 317
 318        for (i = 0; i < count; i++) {
 319                if (!reg_matches[i].init_data || !reg_matches[i].of_node)
 320                        continue;
 321
 322                pdata->tps65217_init_data[i] = reg_matches[i].init_data;
 323                pdata->of_node[i] = reg_matches[i].of_node;
 324        }
 325
 326        return pdata;
 327}
 328#else
 329static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
 330{
 331        return NULL;
 332}
 333#endif
 334
 335static int tps65217_regulator_probe(struct platform_device *pdev)
 336{
 337        struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
 338        struct tps65217_board *pdata = dev_get_platdata(tps->dev);
 339        struct regulator_init_data *reg_data;
 340        struct regulator_dev *rdev;
 341        struct regulator_config config = { };
 342        int i, ret;
 343
 344        if (tps->dev->of_node)
 345                pdata = tps65217_parse_dt(pdev);
 346
 347        if (!pdata) {
 348                dev_err(&pdev->dev, "Platform data not found\n");
 349                return -EINVAL;
 350        }
 351
 352        if (tps65217_chip_id(tps) != TPS65217) {
 353                dev_err(&pdev->dev, "Invalid tps chip version\n");
 354                return -ENODEV;
 355        }
 356
 357        platform_set_drvdata(pdev, tps);
 358
 359        for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
 360
 361                reg_data = pdata->tps65217_init_data[i];
 362
 363                /*
 364                 * Regulator API handles empty constraints but not NULL
 365                 * constraints
 366                 */
 367                if (!reg_data)
 368                        continue;
 369
 370                /* Register the regulators */
 371                tps->info[i] = &tps65217_pmic_regs[i];
 372
 373                config.dev = tps->dev;
 374                config.init_data = reg_data;
 375                config.driver_data = tps;
 376                config.regmap = tps->regmap;
 377                if (tps->dev->of_node)
 378                        config.of_node = pdata->of_node[i];
 379
 380                rdev = regulator_register(&regulators[i], &config);
 381                if (IS_ERR(rdev)) {
 382                        dev_err(tps->dev, "failed to register %s regulator\n",
 383                                pdev->name);
 384                        ret = PTR_ERR(rdev);
 385                        goto err_unregister_regulator;
 386                }
 387
 388                /* Save regulator for cleanup */
 389                tps->rdev[i] = rdev;
 390        }
 391        return 0;
 392
 393err_unregister_regulator:
 394        while (--i >= 0)
 395                regulator_unregister(tps->rdev[i]);
 396
 397        return ret;
 398}
 399
 400static int tps65217_regulator_remove(struct platform_device *pdev)
 401{
 402        struct tps65217 *tps = platform_get_drvdata(pdev);
 403        unsigned int i;
 404
 405        for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
 406                regulator_unregister(tps->rdev[i]);
 407
 408        platform_set_drvdata(pdev, NULL);
 409
 410        return 0;
 411}
 412
 413static struct platform_driver tps65217_regulator_driver = {
 414        .driver = {
 415                .name = "tps65217-pmic",
 416        },
 417        .probe = tps65217_regulator_probe,
 418        .remove = tps65217_regulator_remove,
 419};
 420
 421static int __init tps65217_regulator_init(void)
 422{
 423        return platform_driver_register(&tps65217_regulator_driver);
 424}
 425subsys_initcall(tps65217_regulator_init);
 426
 427static void __exit tps65217_regulator_exit(void)
 428{
 429        platform_driver_unregister(&tps65217_regulator_driver);
 430}
 431module_exit(tps65217_regulator_exit);
 432
 433MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 434MODULE_DESCRIPTION("TPS65217 voltage regulator driver");
 435MODULE_ALIAS("platform:tps65217-pmic");
 436MODULE_LICENSE("GPL v2");
 437
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