drivers/regulator/mt6370-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include <linux/bits.h>
   4 #include <linux/gpio/consumer.h>
   5 #include <linux/interrupt.h>
   6 #include <linux/kernel.h>
   7 #include <linux/mod_devicetable.h>
   8 #include <linux/module.h>
   9 #include <linux/of.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/regmap.h>
  12 #include <linux/regulator/driver.h>
  13 #include <linux/regulator/machine.h>
  14
  15 enum {
  16         MT6370_IDX_DSVBOOST = 0,
  17         MT6370_IDX_DSVPOS,
  18         MT6370_IDX_DSVNEG,
  19         MT6370_IDX_VIBLDO,
  20         MT6370_MAX_IDX
  21 };
  22
  23 #define MT6370_REG_LDO_CFG      0x180
  24 #define MT6370_REG_LDO_VOUT     0x181
  25 #define MT6370_REG_DB_CTRL1     0x1B0
  26 #define MT6370_REG_DB_CTRL2     0x1B1
  27 #define MT6370_REG_DB_VBST      0x1B2
  28 #define MT6370_REG_DB_VPOS      0x1B3
  29 #define MT6370_REG_DB_VNEG      0x1B4
  30 #define MT6370_REG_LDO_STAT     0x1DC
  31 #define MT6370_REG_DB_STAT      0x1DF
  32
  33 #define MT6370_LDOOMS_MASK      BIT(7)
  34 #define MT6370_LDOEN_MASK       BIT(7)
  35 #define MT6370_LDOVOUT_MASK     GENMASK(3, 0)
  36 #define MT6370_DBPERD_MASK      (BIT(7) | BIT(4))
  37 #define MT6370_DBEXTEN_MASK     BIT(0)
  38 #define MT6370_DBVPOSEN_MASK    BIT(6)
  39 #define MT6370_DBVPOSDISG_MASK  BIT(5)
  40 #define MT6370_DBVNEGEN_MASK    BIT(3)
  41 #define MT6370_DBVNEGDISG_MASK  BIT(2)
  42 #define MT6370_DBALLON_MASK     (MT6370_DBVPOSEN_MASK | MT6370_DBVNEGEN_MASK)
  43 #define MT6370_DBSLEW_MASK      GENMASK(7, 6)
  44 #define MT6370_DBVOUT_MASK      GENMASK(5, 0)
  45 #define MT6370_LDOOC_EVT_MASK   BIT(7)
  46 #define MT6370_POSSCP_EVT_MASK  BIT(7)
  47 #define MT6370_NEGSCP_EVT_MASK  BIT(6)
  48 #define MT6370_BSTOCP_EVT_MASK  BIT(5)
  49 #define MT6370_POSOCP_EVT_MASK  BIT(4)
  50 #define MT6370_NEGOCP_EVT_MASK  BIT(3)
  51
  52 #define MT6370_LDO_MINUV        1600000
  53 #define MT6370_LDO_STPUV        200000
  54 #define MT6370_LDO_N_VOLT       13
  55 #define MT6370_DBVBOOST_MINUV   4000000
  56 #define MT6370_DBVBOOST_STPUV   50000
  57 #define MT6370_DBVBOOST_N_VOLT  45
  58 #define MT6370_DBVOUT_MINUV     4000000
  59 #define MT6370_DBVOUT_STPUV     50000
  60 #define MT6370_DBVOUT_N_VOLT    41
  61
  62 struct mt6370_priv {
  63         struct device *dev;
  64         struct regmap *regmap;
  65         struct regulator_dev *rdev[MT6370_MAX_IDX];
  66         bool use_external_ctrl;
  67 };
  68
  69 static const unsigned int mt6370_vpos_ramp_tbl[] = { 8540, 5840, 4830, 3000 };
  70 static const unsigned int mt6370_vneg_ramp_tbl[] = { 10090, 6310, 5050, 3150 };
  71
  72 static int mt6370_get_error_flags(struct regulator_dev *rdev,
  73                                   unsigned int *flags)
  74 {
  75         struct regmap *regmap = rdev_get_regmap(rdev);
  76         unsigned int stat_reg, stat, rpt_flags = 0;
  77         int rid = rdev_get_id(rdev), ret;
  78
  79         if (rid == MT6370_IDX_VIBLDO)
  80                 stat_reg = MT6370_REG_LDO_STAT;
  81         else
  82                 stat_reg = MT6370_REG_DB_STAT;
  83
  84         ret = regmap_read(regmap, stat_reg, &stat);
  85         if (ret)
  86                 return ret;
  87
  88         switch (rid) {
  89         case MT6370_IDX_DSVBOOST:
  90                 if (stat & MT6370_BSTOCP_EVT_MASK)
  91                         rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
  92                 break;
  93         case MT6370_IDX_DSVPOS:
  94                 if (stat & MT6370_POSSCP_EVT_MASK)
  95                         rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
  96
  97                 if (stat & MT6370_POSOCP_EVT_MASK)
  98                         rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
  99                 break;
 100         case MT6370_IDX_DSVNEG:
 101                 if (stat & MT6370_NEGSCP_EVT_MASK)
 102                         rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
 103
 104                 if (stat & MT6370_NEGOCP_EVT_MASK)
 105                         rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
 106                 break;
 107         default:
 108                 if (stat & MT6370_LDOOC_EVT_MASK)
 109                         rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
 110                 break;
 111         }
 112
 113         *flags = rpt_flags;
 114         return 0;
 115 }
 116
 117 static const struct regulator_ops mt6370_dbvboost_ops = {
 118         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 119         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 120         .list_voltage = regulator_list_voltage_linear,
 121         .get_bypass = regulator_get_bypass_regmap,
 122         .set_bypass = regulator_set_bypass_regmap,
 123         .get_error_flags = mt6370_get_error_flags,
 124 };
 125
 126 static const struct regulator_ops mt6370_dbvout_ops = {
 127         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 128         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 129         .list_voltage = regulator_list_voltage_linear,
 130         .is_enabled = regulator_is_enabled_regmap,
 131         .enable = regulator_enable_regmap,
 132         .disable = regulator_disable_regmap,
 133         .set_active_discharge = regulator_set_active_discharge_regmap,
 134         .set_ramp_delay = regulator_set_ramp_delay_regmap,
 135         .get_error_flags = mt6370_get_error_flags,
 136 };
 137
 138 static const struct regulator_ops mt6370_ldo_ops = {
 139         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 140         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 141         .list_voltage = regulator_list_voltage_linear,
 142         .is_enabled = regulator_is_enabled_regmap,
 143         .enable = regulator_enable_regmap,
 144         .disable = regulator_disable_regmap,
 145         .set_active_discharge = regulator_set_active_discharge_regmap,
 146         .get_error_flags = mt6370_get_error_flags,
 147 };
 148
 149 static int mt6370_of_parse_cb(struct device_node *np,
 150                               const struct regulator_desc *desc,
 151                               struct regulator_config *config)
 152 {
 153         struct mt6370_priv *priv = config->driver_data;
 154         struct gpio_desc *enable_gpio;
 155         int ret;
 156
 157         enable_gpio = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
 158                                              GPIOD_OUT_HIGH |
 159                                              GPIOD_FLAGS_BIT_NONEXCLUSIVE,
 160                                              desc->name);
 161         if (IS_ERR(enable_gpio)) {
 162                 config->ena_gpiod = NULL;
 163                 return 0;
 164         }
 165
 166         /*
 167          * RG control by default
 168          * Only if all are using external pin, change all by external control
 169          */
 170         if (priv->use_external_ctrl) {
 171                 ret = regmap_update_bits(priv->regmap, MT6370_REG_DB_CTRL1,
 172                                          MT6370_DBEXTEN_MASK,
 173                                          MT6370_DBEXTEN_MASK);
 174                 if (ret)
 175                         return ret;
 176         }
 177
 178         config->ena_gpiod = enable_gpio;
 179         priv->use_external_ctrl = true;
 180         return 0;
 181 }
 182
 183 static const struct regulator_desc mt6370_regulator_descs[] = {
 184         {
 185                 .name = "mt6370-dsv-vbst",
 186                 .of_match = of_match_ptr("dsvbst"),
 187                 .regulators_node = of_match_ptr("regulators"),
 188                 .id = MT6370_IDX_DSVBOOST,
 189                 .type = REGULATOR_VOLTAGE,
 190                 .owner = THIS_MODULE,
 191                 .ops = &mt6370_dbvboost_ops,
 192                 .min_uV = MT6370_DBVBOOST_MINUV,
 193                 .uV_step = MT6370_DBVBOOST_STPUV,
 194                 .n_voltages = MT6370_DBVBOOST_N_VOLT,
 195                 .vsel_reg = MT6370_REG_DB_VBST,
 196                 .vsel_mask = MT6370_DBVOUT_MASK,
 197                 .bypass_reg = MT6370_REG_DB_CTRL1,
 198                 .bypass_mask = MT6370_DBPERD_MASK,
 199                 .bypass_val_on = MT6370_DBPERD_MASK,
 200         },
 201         {
 202                 .name = "mt6370-dsv-vpos",
 203                 .of_match = of_match_ptr("dsvpos"),
 204                 .regulators_node = of_match_ptr("regulators"),
 205                 .id = MT6370_IDX_DSVPOS,
 206                 .type = REGULATOR_VOLTAGE,
 207                 .owner = THIS_MODULE,
 208                 .of_parse_cb = mt6370_of_parse_cb,
 209                 .ops = &mt6370_dbvout_ops,
 210                 .min_uV = MT6370_DBVOUT_MINUV,
 211                 .uV_step = MT6370_DBVOUT_STPUV,
 212                 .n_voltages = MT6370_DBVOUT_N_VOLT,
 213                 .vsel_reg = MT6370_REG_DB_VPOS,
 214                 .vsel_mask = MT6370_DBVOUT_MASK,
 215                 .enable_reg = MT6370_REG_DB_CTRL2,
 216                 .enable_mask = MT6370_DBVPOSEN_MASK,
 217                 .ramp_reg = MT6370_REG_DB_VPOS,
 218                 .ramp_mask = MT6370_DBSLEW_MASK,
 219                 .ramp_delay_table = mt6370_vpos_ramp_tbl,
 220                 .n_ramp_values = ARRAY_SIZE(mt6370_vpos_ramp_tbl),
 221                 .active_discharge_reg = MT6370_REG_DB_CTRL2,
 222                 .active_discharge_mask = MT6370_DBVPOSDISG_MASK,
 223                 .active_discharge_on = MT6370_DBVPOSDISG_MASK,
 224         },
 225         {
 226                 .name = "mt6370-dsv-vneg",
 227                 .of_match = of_match_ptr("dsvneg"),
 228                 .regulators_node = of_match_ptr("regulators"),
 229                 .id = MT6370_IDX_DSVNEG,
 230                 .type = REGULATOR_VOLTAGE,
 231                 .owner = THIS_MODULE,
 232                 .of_parse_cb = mt6370_of_parse_cb,
 233                 .ops = &mt6370_dbvout_ops,
 234                 .min_uV = MT6370_DBVOUT_MINUV,
 235                 .uV_step = MT6370_DBVOUT_STPUV,
 236                 .n_voltages = MT6370_DBVOUT_N_VOLT,
 237                 .vsel_reg = MT6370_REG_DB_VNEG,
 238                 .vsel_mask = MT6370_DBVOUT_MASK,
 239                 .enable_reg = MT6370_REG_DB_CTRL2,
 240                 .enable_mask = MT6370_DBVNEGEN_MASK,
 241                 .ramp_reg = MT6370_REG_DB_VNEG,
 242                 .ramp_mask = MT6370_DBSLEW_MASK,
 243                 .ramp_delay_table = mt6370_vneg_ramp_tbl,
 244                 .n_ramp_values = ARRAY_SIZE(mt6370_vneg_ramp_tbl),
 245                 .active_discharge_reg = MT6370_REG_DB_CTRL2,
 246                 .active_discharge_mask = MT6370_DBVNEGDISG_MASK,
 247                 .active_discharge_on = MT6370_DBVNEGDISG_MASK,
 248         },
 249         {
 250                 .name = "mt6370-vib-ldo",
 251                 .of_match = of_match_ptr("vibldo"),
 252                 .regulators_node = of_match_ptr("regulators"),
 253                 .id = MT6370_IDX_VIBLDO,
 254                 .type = REGULATOR_VOLTAGE,
 255                 .owner = THIS_MODULE,
 256                 .ops = &mt6370_ldo_ops,
 257                 .min_uV = MT6370_LDO_MINUV,
 258                 .uV_step = MT6370_LDO_STPUV,
 259                 .n_voltages = MT6370_LDO_N_VOLT,
 260                 .vsel_reg = MT6370_REG_LDO_VOUT,
 261                 .vsel_mask = MT6370_LDOVOUT_MASK,
 262                 .enable_reg = MT6370_REG_LDO_VOUT,
 263                 .enable_mask = MT6370_LDOEN_MASK,
 264                 .active_discharge_reg = MT6370_REG_LDO_CFG,
 265                 .active_discharge_mask = MT6370_LDOOMS_MASK,
 266                 .active_discharge_on = MT6370_LDOOMS_MASK,
 267         }
 268 };
 269
 270 static irqreturn_t mt6370_scp_handler(int irq, void *data)
 271 {
 272         struct regulator_dev *rdev = data;
 273
 274         regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE,
 275                                       NULL);
 276         return IRQ_HANDLED;
 277 }
 278
 279 static irqreturn_t mt6370_ocp_handler(int irq, void *data)
 280 {
 281         struct regulator_dev *rdev = data;
 282
 283         regulator_notifier_call_chain(rdev, REGULATOR_EVENT_OVER_CURRENT, NULL);
 284         return IRQ_HANDLED;
 285 }
 286
 287 static int mt6370_regulator_irq_register(struct mt6370_priv *priv)
 288 {
 289         struct platform_device *pdev = to_platform_device(priv->dev);
 290         static const struct {
 291                 const char *name;
 292                 int rid;
 293                 irq_handler_t handler;
 294         } mt6370_irqs[] = {
 295                 { "db_vpos_scp", MT6370_IDX_DSVPOS, mt6370_scp_handler },
 296                 { "db_vneg_scp", MT6370_IDX_DSVNEG, mt6370_scp_handler },
 297                 { "db_vbst_ocp", MT6370_IDX_DSVBOOST, mt6370_ocp_handler },
 298                 { "db_vpos_ocp", MT6370_IDX_DSVPOS,  mt6370_ocp_handler },
 299                 { "db_vneg_ocp", MT6370_IDX_DSVNEG, mt6370_ocp_handler },
 300                 { "ldo_oc", MT6370_IDX_VIBLDO, mt6370_ocp_handler }
 301         };
 302         struct regulator_dev *rdev;
 303         int i, irq, ret;
 304
 305         for (i = 0; i < ARRAY_SIZE(mt6370_irqs); i++) {
 306                 irq = platform_get_irq_byname(pdev, mt6370_irqs[i].name);
 307
 308                 rdev = priv->rdev[mt6370_irqs[i].rid];
 309
 310                 ret = devm_request_threaded_irq(priv->dev, irq, NULL,
 311                                                 mt6370_irqs[i].handler, 0,
 312                                                 mt6370_irqs[i].name, rdev);
 313                 if (ret) {
 314                         dev_err(priv->dev,
 315                                 "Failed to register (%d) interrupt\n", i);
 316                         return ret;
 317                 }
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int mt6370_regualtor_register(struct mt6370_priv *priv)
 324 {
 325         struct regulator_dev *rdev;
 326         struct regulator_config cfg = {};
 327         struct device *parent = priv->dev->parent;
 328         int i;
 329
 330         cfg.dev = parent;
 331         cfg.driver_data = priv;
 332
 333         for (i = 0; i < MT6370_MAX_IDX; i++) {
 334                 rdev = devm_regulator_register(priv->dev,
 335                                                mt6370_regulator_descs + i,
 336                                                &cfg);
 337                 if (IS_ERR(rdev)) {
 338                         dev_err(priv->dev,
 339                                 "Failed to register (%d) regulator\n", i);
 340                         return PTR_ERR(rdev);
 341                 }
 342
 343                 priv->rdev[i] = rdev;
 344         }
 345
 346         return 0;
 347 }
 348
 349 static int mt6370_regulator_probe(struct platform_device *pdev)
 350 {
 351         struct mt6370_priv *priv;
 352         int ret;
 353
 354         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 355         if (!priv)
 356                 return -ENOMEM;
 357
 358         priv->dev = &pdev->dev;
 359
 360         priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 361         if (!priv->regmap) {
 362                 dev_err(&pdev->dev, "Failed to init regmap\n");
 363                 return -ENODEV;
 364         }
 365
 366         ret = mt6370_regualtor_register(priv);
 367         if (ret)
 368                 return ret;
 369
 370         return mt6370_regulator_irq_register(priv);
 371 }
 372
 373 static const struct platform_device_id mt6370_devid_table[] = {
 374         { "mt6370-regulator", 0},
 375         {}
 376 };
 377 MODULE_DEVICE_TABLE(platform, mt6370_devid_table);
 378
 379 static struct platform_driver mt6370_regulator_driver = {
 380         .driver = {
 381                 .name = "mt6370-regulator",
 382                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 383         },
 384         .id_table = mt6370_devid_table,
 385         .probe = mt6370_regulator_probe,
 386 };
 387 module_platform_driver(mt6370_regulator_driver);
 388
 389 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
 390 MODULE_DESCRIPTION("Mediatek MT6370 Regulator Driver");
 391 MODULE_LICENSE("GPL v2");