drivers/regulator/tps65090-regulator.c

   1 /*
   2  * Regulator driver for tps65090 power management chip.
   3  *
   4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   5
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/gpio.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/slab.h>
  24 #include <linux/err.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/regulator/driver.h>
  27 #include <linux/regulator/machine.h>
  28 #include <linux/regulator/of_regulator.h>
  29 #include <linux/mfd/tps65090.h>
  30
  31 struct tps65090_regulator {
  32         struct device           *dev;
  33         struct regulator_desc   *desc;
  34         struct regulator_dev    *rdev;
  35 };
  36
  37 static struct regulator_ops tps65090_ext_control_ops = {
  38 };
  39
  40 static struct regulator_ops tps65090_reg_contol_ops = {
  41         .enable         = regulator_enable_regmap,
  42         .disable        = regulator_disable_regmap,
  43         .is_enabled     = regulator_is_enabled_regmap,
  44 };
  45
  46 static struct regulator_ops tps65090_ldo_ops = {
  47 };
  48
  49 #define tps65090_REG_DESC(_id, _sname, _en_reg, _ops)   \
  50 {                                                       \
  51         .name = "TPS65090_RAILS"#_id,                   \
  52         .supply_name = _sname,                          \
  53         .id = TPS65090_REGULATOR_##_id,                 \
  54         .ops = &_ops,                                   \
  55         .enable_reg = _en_reg,                          \
  56         .enable_mask = BIT(0),                          \
  57         .type = REGULATOR_VOLTAGE,                      \
  58         .owner = THIS_MODULE,                           \
  59 }
  60
  61 static struct regulator_desc tps65090_regulator_desc[] = {
  62         tps65090_REG_DESC(DCDC1, "vsys1",   0x0C, tps65090_reg_contol_ops),
  63         tps65090_REG_DESC(DCDC2, "vsys2",   0x0D, tps65090_reg_contol_ops),
  64         tps65090_REG_DESC(DCDC3, "vsys3",   0x0E, tps65090_reg_contol_ops),
  65         tps65090_REG_DESC(FET1,  "infet1",  0x0F, tps65090_reg_contol_ops),
  66         tps65090_REG_DESC(FET2,  "infet2",  0x10, tps65090_reg_contol_ops),
  67         tps65090_REG_DESC(FET3,  "infet3",  0x11, tps65090_reg_contol_ops),
  68         tps65090_REG_DESC(FET4,  "infet4",  0x12, tps65090_reg_contol_ops),
  69         tps65090_REG_DESC(FET5,  "infet5",  0x13, tps65090_reg_contol_ops),
  70         tps65090_REG_DESC(FET6,  "infet6",  0x14, tps65090_reg_contol_ops),
  71         tps65090_REG_DESC(FET7,  "infet7",  0x15, tps65090_reg_contol_ops),
  72         tps65090_REG_DESC(LDO1,  "vsys-l1", 0,    tps65090_ldo_ops),
  73         tps65090_REG_DESC(LDO2,  "vsys-l2", 0,    tps65090_ldo_ops),
  74 };
  75
  76 static inline bool is_dcdc(int id)
  77 {
  78         switch (id) {
  79         case TPS65090_REGULATOR_DCDC1:
  80         case TPS65090_REGULATOR_DCDC2:
  81         case TPS65090_REGULATOR_DCDC3:
  82                 return true;
  83         default:
  84                 return false;
  85         }
  86 }
  87
  88 static int tps65090_config_ext_control(
  89         struct tps65090_regulator *ri, bool enable)
  90 {
  91         int ret;
  92         struct device *parent = ri->dev->parent;
  93         unsigned int reg_en_reg = ri->desc->enable_reg;
  94
  95         if (enable)
  96                 ret = tps65090_set_bits(parent, reg_en_reg, 1);
  97         else
  98                 ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
  99         if (ret < 0)
 100                 dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
 101         return ret;
 102 }
 103
 104 static int tps65090_regulator_disable_ext_control(
 105                 struct tps65090_regulator *ri,
 106                 struct tps65090_regulator_plat_data *tps_pdata)
 107 {
 108         int ret = 0;
 109         struct device *parent = ri->dev->parent;
 110         unsigned int reg_en_reg = ri->desc->enable_reg;
 111
 112         /*
 113          * First enable output for internal control if require.
 114          * And then disable external control.
 115          */
 116         if (tps_pdata->reg_init_data->constraints.always_on ||
 117                         tps_pdata->reg_init_data->constraints.boot_on) {
 118                 ret =  tps65090_set_bits(parent, reg_en_reg, 0);
 119                 if (ret < 0) {
 120                         dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
 121                         return ret;
 122                 }
 123         }
 124         return tps65090_config_ext_control(ri, false);
 125 }
 126
 127 static void tps65090_configure_regulator_config(
 128                 struct tps65090_regulator_plat_data *tps_pdata,
 129                 struct regulator_config *config)
 130 {
 131         if (gpio_is_valid(tps_pdata->gpio)) {
 132                 int gpio_flag = GPIOF_OUT_INIT_LOW;
 133
 134                 if (tps_pdata->reg_init_data->constraints.always_on ||
 135                                 tps_pdata->reg_init_data->constraints.boot_on)
 136                         gpio_flag = GPIOF_OUT_INIT_HIGH;
 137
 138                 config->ena_gpio = tps_pdata->gpio;
 139                 config->ena_gpio_flags = gpio_flag;
 140         }
 141 }
 142
 143 #ifdef CONFIG_OF
 144 static struct of_regulator_match tps65090_matches[] = {
 145         { .name = "dcdc1", },
 146         { .name = "dcdc2", },
 147         { .name = "dcdc3", },
 148         { .name = "fet1",  },
 149         { .name = "fet2",  },
 150         { .name = "fet3",  },
 151         { .name = "fet4",  },
 152         { .name = "fet5",  },
 153         { .name = "fet6",  },
 154         { .name = "fet7",  },
 155         { .name = "ldo1",  },
 156         { .name = "ldo2",  },
 157 };
 158
 159 static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
 160                 struct platform_device *pdev,
 161                 struct of_regulator_match **tps65090_reg_matches)
 162 {
 163         struct tps65090_platform_data *tps65090_pdata;
 164         struct device_node *np = pdev->dev.parent->of_node;
 165         struct device_node *regulators;
 166         int idx = 0, ret;
 167         struct tps65090_regulator_plat_data *reg_pdata;
 168
 169         tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
 170                                 GFP_KERNEL);
 171         if (!tps65090_pdata) {
 172                 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
 173                 return ERR_PTR(-ENOMEM);
 174         }
 175
 176         reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX *
 177                                 sizeof(*reg_pdata), GFP_KERNEL);
 178         if (!reg_pdata) {
 179                 dev_err(&pdev->dev, "Memory alloc for reg_pdata failed\n");
 180                 return ERR_PTR(-ENOMEM);
 181         }
 182
 183         regulators = of_find_node_by_name(np, "regulators");
 184         if (!regulators) {
 185                 dev_err(&pdev->dev, "regulator node not found\n");
 186                 return ERR_PTR(-ENODEV);
 187         }
 188
 189         ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
 190                         ARRAY_SIZE(tps65090_matches));
 191         if (ret < 0) {
 192                 dev_err(&pdev->dev,
 193                         "Error parsing regulator init data: %d\n", ret);
 194                 return ERR_PTR(ret);
 195         }
 196
 197         *tps65090_reg_matches = tps65090_matches;
 198         for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
 199                 struct regulator_init_data *ri_data;
 200                 struct tps65090_regulator_plat_data *rpdata;
 201
 202                 rpdata = &reg_pdata[idx];
 203                 ri_data = tps65090_matches[idx].init_data;
 204                 if (!ri_data || !tps65090_matches[idx].of_node)
 205                         continue;
 206
 207                 rpdata->reg_init_data = ri_data;
 208                 rpdata->enable_ext_control = of_property_read_bool(
 209                                         tps65090_matches[idx].of_node,
 210                                         "ti,enable-ext-control");
 211                 if (rpdata->enable_ext_control)
 212                         rpdata->gpio = of_get_named_gpio(np,
 213                                         "dcdc-ext-control-gpios", 0);
 214
 215                 tps65090_pdata->reg_pdata[idx] = rpdata;
 216         }
 217         return tps65090_pdata;
 218 }
 219 #else
 220 static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
 221                         struct platform_device *pdev,
 222                         struct of_regulator_match **tps65090_reg_matches)
 223 {
 224         *tps65090_reg_matches = NULL;
 225         return NULL;
 226 }
 227 #endif
 228
 229 static int tps65090_regulator_probe(struct platform_device *pdev)
 230 {
 231         struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
 232         struct tps65090_regulator *ri = NULL;
 233         struct regulator_config config = { };
 234         struct regulator_dev *rdev;
 235         struct tps65090_regulator_plat_data *tps_pdata;
 236         struct tps65090_regulator *pmic;
 237         struct tps65090_platform_data *tps65090_pdata;
 238         struct of_regulator_match *tps65090_reg_matches = NULL;
 239         int num;
 240         int ret;
 241
 242         dev_dbg(&pdev->dev, "Probing regulator\n");
 243
 244         tps65090_pdata = dev_get_platdata(pdev->dev.parent);
 245         if (!tps65090_pdata && tps65090_mfd->dev->of_node)
 246                 tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
 247                                         &tps65090_reg_matches);
 248         if (IS_ERR_OR_NULL(tps65090_pdata)) {
 249                 dev_err(&pdev->dev, "Platform data missing\n");
 250                 return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
 251         }
 252
 253         pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
 254                         GFP_KERNEL);
 255         if (!pmic) {
 256                 dev_err(&pdev->dev, "mem alloc for pmic failed\n");
 257                 return -ENOMEM;
 258         }
 259
 260         for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
 261                 tps_pdata = tps65090_pdata->reg_pdata[num];
 262
 263                 ri = &pmic[num];
 264                 ri->dev = &pdev->dev;
 265                 ri->desc = &tps65090_regulator_desc[num];
 266
 267                 /*
 268                  * TPS5090 DCDC support the control from external digital input.
 269                  * Configure it as per platform data.
 270                  */
 271                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
 272                         if (tps_pdata->enable_ext_control) {
 273                                 tps65090_configure_regulator_config(
 274                                                 tps_pdata, &config);
 275                                 ri->desc->ops = &tps65090_ext_control_ops;
 276                         } else {
 277                                 ret = tps65090_regulator_disable_ext_control(
 278                                                 ri, tps_pdata);
 279                                 if (ret < 0) {
 280                                         dev_err(&pdev->dev,
 281                                                 "failed disable ext control\n");
 282                                         goto scrub;
 283                                 }
 284                         }
 285                 }
 286
 287                 config.dev = pdev->dev.parent;
 288                 config.driver_data = ri;
 289                 config.regmap = tps65090_mfd->rmap;
 290                 if (tps_pdata)
 291                         config.init_data = tps_pdata->reg_init_data;
 292                 else
 293                         config.init_data = NULL;
 294                 if (tps65090_reg_matches)
 295                         config.of_node = tps65090_reg_matches[num].of_node;
 296                 else
 297                         config.of_node = NULL;
 298
 299                 rdev = regulator_register(ri->desc, &config);
 300                 if (IS_ERR(rdev)) {
 301                         dev_err(&pdev->dev, "failed to register regulator %s\n",
 302                                 ri->desc->name);
 303                         ret = PTR_ERR(rdev);
 304                         goto scrub;
 305                 }
 306                 ri->rdev = rdev;
 307
 308                 /* Enable external control if it is require */
 309                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
 310                                 tps_pdata->enable_ext_control) {
 311                         ret = tps65090_config_ext_control(ri, true);
 312                         if (ret < 0) {
 313                                 /* Increment num to get unregister rdev */
 314                                 num++;
 315                                 goto scrub;
 316                         }
 317                 }
 318         }
 319
 320         platform_set_drvdata(pdev, pmic);
 321         return 0;
 322
 323 scrub:
 324         while (--num >= 0) {
 325                 ri = &pmic[num];
 326                 regulator_unregister(ri->rdev);
 327         }
 328         return ret;
 329 }
 330
 331 static int tps65090_regulator_remove(struct platform_device *pdev)
 332 {
 333         struct tps65090_regulator *pmic = platform_get_drvdata(pdev);
 334         struct tps65090_regulator *ri;
 335         int num;
 336
 337         for (num = 0; num < TPS65090_REGULATOR_MAX; ++num) {
 338                 ri = &pmic[num];
 339                 regulator_unregister(ri->rdev);
 340         }
 341         return 0;
 342 }
 343
 344 static struct platform_driver tps65090_regulator_driver = {
 345         .driver = {
 346                 .name   = "tps65090-pmic",
 347                 .owner  = THIS_MODULE,
 348         },
 349         .probe          = tps65090_regulator_probe,
 350         .remove         = tps65090_regulator_remove,
 351 };
 352
 353 static int __init tps65090_regulator_init(void)
 354 {
 355         return platform_driver_register(&tps65090_regulator_driver);
 356 }
 357 subsys_initcall(tps65090_regulator_init);
 358
 359 static void __exit tps65090_regulator_exit(void)
 360 {
 361         platform_driver_unregister(&tps65090_regulator_driver);
 362 }
 363 module_exit(tps65090_regulator_exit);
 364
 365 MODULE_DESCRIPTION("tps65090 regulator driver");
 366 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
 367 MODULE_LICENSE("GPL v2");
 368 MODULE_ALIAS("platform:tps65090-pmic");