drivers/regulator/rt5759-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include <linux/bits.h>
   4 #include <linux/i2c.h>
   5 #include <linux/kernel.h>
   6 #include <linux/module.h>
   7 #include <linux/of.h>
   8 #include <linux/regmap.h>
   9 #include <linux/regulator/driver.h>
  10 #include <linux/regulator/of_regulator.h>
  11
  12 #define RT5759_REG_VENDORINFO   0x00
  13 #define RT5759_REG_FREQ         0x01
  14 #define RT5759_REG_VSEL         0x02
  15 #define RT5759_REG_DCDCCTRL     0x03
  16 #define RT5759_REG_STATUS       0x04
  17 #define RT5759_REG_DCDCSET      0x05
  18 #define RT5759A_REG_WDTEN       0x42
  19
  20 #define RT5759_TSTEP_MASK       GENMASK(3, 2)
  21 #define RT5759_VSEL_MASK        GENMASK(6, 0)
  22 #define RT5759_DISCHARGE_MASK   BIT(3)
  23 #define RT5759_FPWM_MASK        BIT(2)
  24 #define RT5759_ENABLE_MASK      BIT(1)
  25 #define RT5759_OT_MASK          BIT(1)
  26 #define RT5759_UV_MASK          BIT(0)
  27 #define RT5957_OCLVL_MASK       GENMASK(7, 6)
  28 #define RT5759_OCLVL_SHIFT      6
  29 #define RT5957_OTLVL_MASK       GENMASK(5, 4)
  30 #define RT5759_OTLVL_SHIFT      4
  31 #define RT5759A_WDTEN_MASK      BIT(1)
  32
  33 #define RT5759_MANUFACTURER_ID  0x82
  34 /* vsel range 0x00 ~ 0x5A */
  35 #define RT5759_NUM_VOLTS        91
  36 #define RT5759_MIN_UV           600000
  37 #define RT5759_STEP_UV          10000
  38 #define RT5759A_STEP_UV         12500
  39 #define RT5759_MINSS_TIMEUS     1500
  40
  41 #define RT5759_PSKIP_MODE       0
  42 #define RT5759_FPWM_MODE        1
  43
  44 enum {
  45         CHIP_TYPE_RT5759 = 0,
  46         CHIP_TYPE_RT5759A,
  47         CHIP_TYPE_MAX
  48 };
  49
  50 struct rt5759_priv {
  51         struct device *dev;
  52         struct regmap *regmap;
  53         struct regulator_desc desc;
  54         unsigned long chip_type;
  55 };
  56
  57 static int rt5759_set_mode(struct regulator_dev *rdev, unsigned int mode)
  58 {
  59         struct regmap *regmap = rdev_get_regmap(rdev);
  60         unsigned int mode_val;
  61
  62         switch (mode) {
  63         case REGULATOR_MODE_NORMAL:
  64                 mode_val = 0;
  65                 break;
  66         case REGULATOR_MODE_FAST:
  67                 mode_val = RT5759_FPWM_MASK;
  68                 break;
  69         default:
  70                 return -EINVAL;
  71         }
  72
  73         return regmap_update_bits(regmap, RT5759_REG_STATUS, RT5759_FPWM_MASK,
  74                                   mode_val);
  75 }
  76
  77 static unsigned int rt5759_get_mode(struct regulator_dev *rdev)
  78 {
  79         struct regmap *regmap = rdev_get_regmap(rdev);
  80         unsigned int regval;
  81         int ret;
  82
  83         ret = regmap_read(regmap, RT5759_REG_DCDCCTRL, &regval);
  84         if (ret)
  85                 return REGULATOR_MODE_INVALID;
  86
  87         if (regval & RT5759_FPWM_MASK)
  88                 return REGULATOR_MODE_FAST;
  89
  90         return REGULATOR_MODE_NORMAL;
  91 }
  92
  93 static int rt5759_get_error_flags(struct regulator_dev *rdev,
  94                                   unsigned int *flags)
  95 {
  96         struct regmap *regmap = rdev_get_regmap(rdev);
  97         unsigned int status, events = 0;
  98         int ret;
  99
 100         ret = regmap_read(regmap, RT5759_REG_STATUS, &status);
 101         if (ret)
 102                 return ret;
 103
 104         if (status & RT5759_OT_MASK)
 105                 events |= REGULATOR_ERROR_OVER_TEMP;
 106
 107         if (status & RT5759_UV_MASK)
 108                 events |= REGULATOR_ERROR_UNDER_VOLTAGE;
 109
 110         *flags = events;
 111         return 0;
 112 }
 113
 114 static int rt5759_set_ocp(struct regulator_dev *rdev, int lim_uA, int severity,
 115                           bool enable)
 116 {
 117         struct regmap *regmap = rdev_get_regmap(rdev);
 118         int ocp_lvl[] = { 9800000, 10800000, 11800000 };
 119         unsigned int ocp_regval;
 120         int i;
 121
 122         /* Only support over current protection parameter */
 123         if (severity != REGULATOR_SEVERITY_PROT)
 124                 return 0;
 125
 126         if (enable) {
 127                 /* Default ocp level is 10.8A */
 128                 if (lim_uA == 0)
 129                         lim_uA = 10800000;
 130
 131                 for (i = 0; i < ARRAY_SIZE(ocp_lvl); i++) {
 132                         if (lim_uA <= ocp_lvl[i])
 133                                 break;
 134                 }
 135
 136                 if (i == ARRAY_SIZE(ocp_lvl))
 137                         i = ARRAY_SIZE(ocp_lvl) - 1;
 138
 139                 ocp_regval = i + 1;
 140         } else
 141                 ocp_regval = 0;
 142
 143         return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OCLVL_MASK,
 144                                   ocp_regval << RT5759_OCLVL_SHIFT);
 145 }
 146
 147 static int rt5759_set_otp(struct regulator_dev *rdev, int lim, int severity,
 148                           bool enable)
 149 {
 150         struct regmap *regmap = rdev_get_regmap(rdev);
 151         int otp_lvl[] = { 140, 150, 170 };
 152         unsigned int otp_regval;
 153         int i;
 154
 155         /* Only support over temperature protection parameter */
 156         if (severity != REGULATOR_SEVERITY_PROT)
 157                 return 0;
 158
 159         if (enable) {
 160                 /* Default otp level is 150'c */
 161                 if (lim == 0)
 162                         lim = 150;
 163
 164                 for (i = 0; i < ARRAY_SIZE(otp_lvl); i++) {
 165                         if (lim <= otp_lvl[i])
 166                                 break;
 167                 }
 168
 169                 if (i == ARRAY_SIZE(otp_lvl))
 170                         i = ARRAY_SIZE(otp_lvl) - 1;
 171
 172                 otp_regval = i + 1;
 173         } else
 174                 otp_regval = 0;
 175
 176         return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OTLVL_MASK,
 177                                   otp_regval << RT5759_OTLVL_SHIFT);
 178 }
 179
 180 static const struct regulator_ops rt5759_regulator_ops = {
 181         .list_voltage = regulator_list_voltage_linear,
 182         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 183         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 184         .enable = regulator_enable_regmap,
 185         .disable = regulator_disable_regmap,
 186         .is_enabled = regulator_is_enabled_regmap,
 187         .set_active_discharge = regulator_set_active_discharge_regmap,
 188         .set_mode = rt5759_set_mode,
 189         .get_mode = rt5759_get_mode,
 190         .set_ramp_delay = regulator_set_ramp_delay_regmap,
 191         .get_error_flags = rt5759_get_error_flags,
 192         .set_over_current_protection = rt5759_set_ocp,
 193         .set_thermal_protection = rt5759_set_otp,
 194 };
 195
 196 static unsigned int rt5759_of_map_mode(unsigned int mode)
 197 {
 198         switch (mode) {
 199         case RT5759_FPWM_MODE:
 200                 return REGULATOR_MODE_FAST;
 201         case RT5759_PSKIP_MODE:
 202                 return REGULATOR_MODE_NORMAL;
 203         default:
 204                 return REGULATOR_MODE_INVALID;
 205         }
 206 }
 207
 208 static const unsigned int rt5759_ramp_table[] = { 20000, 15000, 10000, 5000 };
 209
 210 static int rt5759_regulator_register(struct rt5759_priv *priv)
 211 {
 212         struct device_node *np = priv->dev->of_node;
 213         struct regulator_desc *reg_desc = &priv->desc;
 214         struct regulator_config reg_cfg;
 215         struct regulator_dev *rdev;
 216         int ret;
 217
 218         reg_desc->name = "rt5759-buck";
 219         reg_desc->type = REGULATOR_VOLTAGE;
 220         reg_desc->owner = THIS_MODULE;
 221         reg_desc->ops = &rt5759_regulator_ops;
 222         reg_desc->n_voltages = RT5759_NUM_VOLTS;
 223         reg_desc->min_uV = RT5759_MIN_UV;
 224         reg_desc->uV_step = RT5759_STEP_UV;
 225         reg_desc->vsel_reg = RT5759_REG_VSEL;
 226         reg_desc->vsel_mask = RT5759_VSEL_MASK;
 227         reg_desc->enable_reg = RT5759_REG_DCDCCTRL;
 228         reg_desc->enable_mask = RT5759_ENABLE_MASK;
 229         reg_desc->active_discharge_reg = RT5759_REG_DCDCCTRL;
 230         reg_desc->active_discharge_mask = RT5759_DISCHARGE_MASK;
 231         reg_desc->active_discharge_on = RT5759_DISCHARGE_MASK;
 232         reg_desc->ramp_reg = RT5759_REG_FREQ;
 233         reg_desc->ramp_mask = RT5759_TSTEP_MASK;
 234         reg_desc->ramp_delay_table = rt5759_ramp_table;
 235         reg_desc->n_ramp_values = ARRAY_SIZE(rt5759_ramp_table);
 236         reg_desc->enable_time = RT5759_MINSS_TIMEUS;
 237         reg_desc->of_map_mode = rt5759_of_map_mode;
 238
 239         /*
 240          * RT5759 step uV = 10000
 241          * RT5759A step uV = 12500
 242          */
 243         if (priv->chip_type == CHIP_TYPE_RT5759A)
 244                 reg_desc->uV_step = RT5759A_STEP_UV;
 245
 246         memset(&reg_cfg, 0, sizeof(reg_cfg));
 247         reg_cfg.dev = priv->dev;
 248         reg_cfg.of_node = np;
 249         reg_cfg.init_data = of_get_regulator_init_data(priv->dev, np, reg_desc);
 250         reg_cfg.regmap = priv->regmap;
 251
 252         rdev = devm_regulator_register(priv->dev, reg_desc, &reg_cfg);
 253         if (IS_ERR(rdev)) {
 254                 ret = PTR_ERR(rdev);
 255                 dev_err(priv->dev, "Failed to register regulator (%d)\n", ret);
 256                 return ret;
 257         }
 258
 259         return 0;
 260 }
 261
 262 static int rt5759_init_device_property(struct rt5759_priv *priv)
 263 {
 264         unsigned int val = 0;
 265
 266         /*
 267          * Only RT5759A support external watchdog input
 268          */
 269         if (priv->chip_type != CHIP_TYPE_RT5759A)
 270                 return 0;
 271
 272         if (device_property_read_bool(priv->dev, "richtek,watchdog-enable"))
 273                 val = RT5759A_WDTEN_MASK;
 274
 275         return regmap_update_bits(priv->regmap, RT5759A_REG_WDTEN,
 276                                   RT5759A_WDTEN_MASK, val);
 277 }
 278
 279 static int rt5759_manufacturer_check(struct rt5759_priv *priv)
 280 {
 281         unsigned int vendor;
 282         int ret;
 283
 284         ret = regmap_read(priv->regmap, RT5759_REG_VENDORINFO, &vendor);
 285         if (ret)
 286                 return ret;
 287
 288         if (vendor != RT5759_MANUFACTURER_ID) {
 289                 dev_err(priv->dev, "vendor info not correct (%d)\n", vendor);
 290                 return -EINVAL;
 291         }
 292
 293         return 0;
 294 }
 295
 296 static bool rt5759_is_accessible_reg(struct device *dev, unsigned int reg)
 297 {
 298         struct rt5759_priv *priv = dev_get_drvdata(dev);
 299
 300         if (reg <= RT5759_REG_DCDCSET)
 301                 return true;
 302
 303         if (priv->chip_type == CHIP_TYPE_RT5759A && reg == RT5759A_REG_WDTEN)
 304                 return true;
 305
 306         return false;
 307 }
 308
 309 static const struct regmap_config rt5759_regmap_config = {
 310         .reg_bits = 8,
 311         .val_bits = 8,
 312         .max_register = RT5759A_REG_WDTEN,
 313         .readable_reg = rt5759_is_accessible_reg,
 314         .writeable_reg = rt5759_is_accessible_reg,
 315 };
 316
 317 static int rt5759_probe(struct i2c_client *i2c)
 318 {
 319         struct rt5759_priv *priv;
 320         int ret;
 321
 322         priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
 323         if (!priv)
 324                 return -ENOMEM;
 325
 326         priv->dev = &i2c->dev;
 327         priv->chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
 328         i2c_set_clientdata(i2c, priv);
 329
 330         priv->regmap = devm_regmap_init_i2c(i2c, &rt5759_regmap_config);
 331         if (IS_ERR(priv->regmap)) {
 332                 ret = PTR_ERR(priv->regmap);
 333                 dev_err(&i2c->dev, "Failed to allocate regmap (%d)\n", ret);
 334                 return ret;
 335         }
 336
 337         ret = rt5759_manufacturer_check(priv);
 338         if (ret) {
 339                 dev_err(&i2c->dev, "Failed to check device (%d)\n", ret);
 340                 return ret;
 341         }
 342
 343         ret = rt5759_init_device_property(priv);
 344         if (ret) {
 345                 dev_err(&i2c->dev, "Failed to init device (%d)\n", ret);
 346                 return ret;
 347         }
 348
 349         return rt5759_regulator_register(priv);
 350 }
 351
 352 static const struct of_device_id __maybe_unused rt5759_device_table[] = {
 353         { .compatible = "richtek,rt5759", .data = (void *)CHIP_TYPE_RT5759 },
 354         { .compatible = "richtek,rt5759a", .data = (void *)CHIP_TYPE_RT5759A },
 355         {}
 356 };
 357 MODULE_DEVICE_TABLE(of, rt5759_device_table);
 358
 359 static struct i2c_driver rt5759_driver = {
 360         .driver = {
 361                 .name = "rt5759",
 362                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 363                 .of_match_table = of_match_ptr(rt5759_device_table),
 364         },
 365         .probe = rt5759_probe,
 366 };
 367 module_i2c_driver(rt5759_driver);
 368
 369 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
 370 MODULE_DESCRIPTION("Richtek RT5759 Regulator Driver");
 371 MODULE_LICENSE("GPL v2");