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, _lr, _nlr) \
  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                .linear_ranges  = _lr,                  \
  44                .n_linear_ranges = _nlr,                \
  45        }                                               \
  46
  47static const unsigned int LDO1_VSEL_table[] = {
  48        1000000, 1100000, 1200000, 1250000,
  49        1300000, 1350000, 1400000, 1500000,
  50        1600000, 1800000, 2500000, 2750000,
  51        2800000, 3000000, 3100000, 3300000,
  52};
  53
  54static const struct regulator_linear_range tps65217_uv1_ranges[] = {
  55        { .min_uV = 900000, .max_uV = 1500000, .min_sel =  0, .max_sel = 24,
  56          .uV_step = 25000 },
  57        { .min_uV = 1550000, .max_uV = 1800000, .min_sel = 25, .max_sel = 30,
  58          .uV_step = 50000 },
  59        { .min_uV = 1850000, .max_uV = 2900000, .min_sel = 31, .max_sel = 52,
  60          .uV_step = 50000 },
  61        { .min_uV = 3000000, .max_uV = 3200000, .min_sel = 53, .max_sel = 55,
  62          .uV_step = 100000 },
  63        { .min_uV = 3300000, .max_uV = 3300000, .min_sel = 56, .max_sel = 62,
  64          .uV_step = 0 },
  65};
  66
  67static const struct regulator_linear_range tps65217_uv2_ranges[] = {
  68        { .min_uV = 1500000, .max_uV = 1900000, .min_sel =  0, .max_sel = 8,
  69          .uV_step = 50000 },
  70        { .min_uV = 2000000, .max_uV = 2400000, .min_sel = 9, .max_sel = 13,
  71          .uV_step = 100000 },
  72        { .min_uV = 2450000, .max_uV = 3300000, .min_sel = 14, .max_sel = 31,
  73          .uV_step = 50000 },
  74};
  75
  76static int tps65217_pmic_enable(struct regulator_dev *dev)
  77{
  78        struct tps65217 *tps = rdev_get_drvdata(dev);
  79        unsigned int rid = rdev_get_id(dev);
  80
  81        if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
  82                return -EINVAL;
  83
  84        /* Enable the regulator and password protection is level 1 */
  85        return tps65217_set_bits(tps, TPS65217_REG_ENABLE,
  86                                 dev->desc->enable_mask, dev->desc->enable_mask,
  87                                 TPS65217_PROTECT_L1);
  88}
  89
  90static int tps65217_pmic_disable(struct regulator_dev *dev)
  91{
  92        struct tps65217 *tps = rdev_get_drvdata(dev);
  93        unsigned int rid = rdev_get_id(dev);
  94
  95        if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
  96                return -EINVAL;
  97
  98        /* Disable the regulator and password protection is level 1 */
  99        return tps65217_clear_bits(tps, TPS65217_REG_ENABLE,
 100                                   dev->desc->enable_mask, TPS65217_PROTECT_L1);
 101}
 102
 103static int tps65217_pmic_set_voltage_sel(struct regulator_dev *dev,
 104                                         unsigned selector)
 105{
 106        int ret;
 107        struct tps65217 *tps = rdev_get_drvdata(dev);
 108        unsigned int rid = rdev_get_id(dev);
 109
 110        /* Set the voltage based on vsel value and write protect level is 2 */
 111        ret = tps65217_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
 112                                selector, TPS65217_PROTECT_L2);
 113
 114        /* Set GO bit for DCDCx to initiate voltage transistion */
 115        switch (rid) {
 116        case TPS65217_DCDC_1 ... TPS65217_DCDC_3:
 117                ret = tps65217_set_bits(tps, TPS65217_REG_DEFSLEW,
 118                                       TPS65217_DEFSLEW_GO, TPS65217_DEFSLEW_GO,
 119                                       TPS65217_PROTECT_L2);
 120                break;
 121        }
 122
 123        return ret;
 124}
 125
 126/* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
 127static struct regulator_ops tps65217_pmic_ops = {
 128        .is_enabled             = regulator_is_enabled_regmap,
 129        .enable                 = tps65217_pmic_enable,
 130        .disable                = tps65217_pmic_disable,
 131        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 132        .set_voltage_sel        = tps65217_pmic_set_voltage_sel,
 133        .list_voltage           = regulator_list_voltage_linear_range,
 134        .map_voltage            = regulator_map_voltage_linear_range,
 135};
 136
 137/* Operations permitted on LDO1 */
 138static struct regulator_ops tps65217_pmic_ldo1_ops = {
 139        .is_enabled             = regulator_is_enabled_regmap,
 140        .enable                 = tps65217_pmic_enable,
 141        .disable                = tps65217_pmic_disable,
 142        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 143        .set_voltage_sel        = tps65217_pmic_set_voltage_sel,
 144        .list_voltage           = regulator_list_voltage_table,
 145};
 146
 147static const struct regulator_desc regulators[] = {
 148        TPS65217_REGULATOR("DCDC1", TPS65217_DCDC_1, tps65217_pmic_ops, 64,
 149                           TPS65217_REG_DEFDCDC1, TPS65217_DEFDCDCX_DCDC_MASK,
 150                           TPS65217_ENABLE_DC1_EN, NULL, tps65217_uv1_ranges,
 151                           2),  /* DCDC1 voltage range: 900000 ~ 1800000 */
 152        TPS65217_REGULATOR("DCDC2", TPS65217_DCDC_2, tps65217_pmic_ops, 64,
 153                           TPS65217_REG_DEFDCDC2, TPS65217_DEFDCDCX_DCDC_MASK,
 154                           TPS65217_ENABLE_DC2_EN, NULL, tps65217_uv1_ranges,
 155                           ARRAY_SIZE(tps65217_uv1_ranges)),
 156        TPS65217_REGULATOR("DCDC3", TPS65217_DCDC_3, tps65217_pmic_ops, 64,
 157                           TPS65217_REG_DEFDCDC3, TPS65217_DEFDCDCX_DCDC_MASK,
 158                           TPS65217_ENABLE_DC3_EN, NULL, tps65217_uv1_ranges,
 159                           1),  /* DCDC3 voltage range: 900000 ~ 1500000 */
 160        TPS65217_REGULATOR("LDO1", TPS65217_LDO_1, tps65217_pmic_ldo1_ops, 16,
 161                           TPS65217_REG_DEFLDO1, TPS65217_DEFLDO1_LDO1_MASK,
 162                           TPS65217_ENABLE_LDO1_EN, LDO1_VSEL_table, NULL, 0),
 163        TPS65217_REGULATOR("LDO2", TPS65217_LDO_2, tps65217_pmic_ops, 64,
 164                           TPS65217_REG_DEFLDO2, TPS65217_DEFLDO2_LDO2_MASK,
 165                           TPS65217_ENABLE_LDO2_EN, NULL, tps65217_uv1_ranges,
 166                           ARRAY_SIZE(tps65217_uv1_ranges)),
 167        TPS65217_REGULATOR("LDO3", TPS65217_LDO_3, tps65217_pmic_ops, 32,
 168                           TPS65217_REG_DEFLS1, TPS65217_DEFLDO3_LDO3_MASK,
 169                           TPS65217_ENABLE_LS1_EN | TPS65217_DEFLDO3_LDO3_EN,
 170                           NULL, tps65217_uv2_ranges,
 171                           ARRAY_SIZE(tps65217_uv2_ranges)),
 172        TPS65217_REGULATOR("LDO4", TPS65217_LDO_4, tps65217_pmic_ops, 32,
 173                           TPS65217_REG_DEFLS2, TPS65217_DEFLDO4_LDO4_MASK,
 174                           TPS65217_ENABLE_LS2_EN | TPS65217_DEFLDO4_LDO4_EN,
 175                           NULL, tps65217_uv2_ranges,
 176                           ARRAY_SIZE(tps65217_uv2_ranges)),
 177};
 178
 179#ifdef CONFIG_OF
 180static struct of_regulator_match reg_matches[] = {
 181        { .name = "dcdc1", .driver_data = (void *)TPS65217_DCDC_1 },
 182        { .name = "dcdc2", .driver_data = (void *)TPS65217_DCDC_2 },
 183        { .name = "dcdc3", .driver_data = (void *)TPS65217_DCDC_3 },
 184        { .name = "ldo1", .driver_data = (void *)TPS65217_LDO_1 },
 185        { .name = "ldo2", .driver_data = (void *)TPS65217_LDO_2 },
 186        { .name = "ldo3", .driver_data = (void *)TPS65217_LDO_3 },
 187        { .name = "ldo4", .driver_data = (void *)TPS65217_LDO_4 },
 188};
 189
 190static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
 191{
 192        struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
 193        struct device_node *node = tps->dev->of_node;
 194        struct tps65217_board *pdata;
 195        struct device_node *regs;
 196        int i, count;
 197
 198        regs = of_find_node_by_name(node, "regulators");
 199        if (!regs)
 200                return NULL;
 201
 202        count = of_regulator_match(&pdev->dev, regs, reg_matches,
 203                                   TPS65217_NUM_REGULATOR);
 204        of_node_put(regs);
 205        if ((count < 0) || (count > TPS65217_NUM_REGULATOR))
 206                return NULL;
 207
 208        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 209        if (!pdata)
 210                return NULL;
 211
 212        for (i = 0; i < count; i++) {
 213                if (!reg_matches[i].init_data || !reg_matches[i].of_node)
 214                        continue;
 215
 216                pdata->tps65217_init_data[i] = reg_matches[i].init_data;
 217                pdata->of_node[i] = reg_matches[i].of_node;
 218        }
 219
 220        return pdata;
 221}
 222#else
 223static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
 224{
 225        return NULL;
 226}
 227#endif
 228
 229static int tps65217_regulator_probe(struct platform_device *pdev)
 230{
 231        struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
 232        struct tps65217_board *pdata = dev_get_platdata(tps->dev);
 233        struct regulator_init_data *reg_data;
 234        struct regulator_dev *rdev;
 235        struct regulator_config config = { };
 236        int i, ret;
 237
 238        if (tps->dev->of_node)
 239                pdata = tps65217_parse_dt(pdev);
 240
 241        if (!pdata) {
 242                dev_err(&pdev->dev, "Platform data not found\n");
 243                return -EINVAL;
 244        }
 245
 246        if (tps65217_chip_id(tps) != TPS65217) {
 247                dev_err(&pdev->dev, "Invalid tps chip version\n");
 248                return -ENODEV;
 249        }
 250
 251        platform_set_drvdata(pdev, tps);
 252
 253        for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
 254
 255                reg_data = pdata->tps65217_init_data[i];
 256
 257                /*
 258                 * Regulator API handles empty constraints but not NULL
 259                 * constraints
 260                 */
 261                if (!reg_data)
 262                        continue;
 263
 264                /* Register the regulators */
 265                config.dev = tps->dev;
 266                config.init_data = reg_data;
 267                config.driver_data = tps;
 268                config.regmap = tps->regmap;
 269                if (tps->dev->of_node)
 270                        config.of_node = pdata->of_node[i];
 271
 272                rdev = regulator_register(&regulators[i], &config);
 273                if (IS_ERR(rdev)) {
 274                        dev_err(tps->dev, "failed to register %s regulator\n",
 275                                pdev->name);
 276                        ret = PTR_ERR(rdev);
 277                        goto err_unregister_regulator;
 278                }
 279
 280                /* Save regulator for cleanup */
 281                tps->rdev[i] = rdev;
 282        }
 283        return 0;
 284
 285err_unregister_regulator:
 286        while (--i >= 0)
 287                regulator_unregister(tps->rdev[i]);
 288
 289        return ret;
 290}
 291
 292static int tps65217_regulator_remove(struct platform_device *pdev)
 293{
 294        struct tps65217 *tps = platform_get_drvdata(pdev);
 295        unsigned int i;
 296
 297        for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
 298                regulator_unregister(tps->rdev[i]);
 299
 300        return 0;
 301}
 302
 303static struct platform_driver tps65217_regulator_driver = {
 304        .driver = {
 305                .name = "tps65217-pmic",
 306        },
 307        .probe = tps65217_regulator_probe,
 308        .remove = tps65217_regulator_remove,
 309};
 310
 311static int __init tps65217_regulator_init(void)
 312{
 313        return platform_driver_register(&tps65217_regulator_driver);
 314}
 315subsys_initcall(tps65217_regulator_init);
 316
 317static void __exit tps65217_regulator_exit(void)
 318{
 319        platform_driver_unregister(&tps65217_regulator_driver);
 320}
 321module_exit(tps65217_regulator_exit);
 322
 323MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 324MODULE_DESCRIPTION("TPS65217 voltage regulator driver");
 325MODULE_ALIAS("platform:tps65217-pmic");
 326MODULE_LICENSE("GPL v2");
 327
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