drivers/regulator/rtq6752-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include <linux/bitops.h>
   4 #include <linux/delay.h>
   5 #include <linux/gpio/consumer.h>
   6 #include <linux/i2c.h>
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/mutex.h>
  10 #include <linux/regmap.h>
  11 #include <linux/regulator/driver.h>
  12
  13 enum {
  14         RTQ6752_IDX_PAVDD = 0,
  15         RTQ6752_IDX_NAVDD = 1,
  16         RTQ6752_IDX_MAX
  17 };
  18
  19 #define RTQ6752_REG_PAVDD       0x00
  20 #define RTQ6752_REG_NAVDD       0x01
  21 #define RTQ6752_REG_PAVDDONDLY  0x07
  22 #define RTQ6752_REG_PAVDDSSTIME 0x08
  23 #define RTQ6752_REG_NAVDDONDLY  0x0D
  24 #define RTQ6752_REG_NAVDDSSTIME 0x0E
  25 #define RTQ6752_REG_OPTION1     0x12
  26 #define RTQ6752_REG_CHSWITCH    0x16
  27 #define RTQ6752_REG_FAULT       0x1D
  28
  29 #define RTQ6752_VOUT_MASK       GENMASK(5, 0)
  30 #define RTQ6752_NAVDDEN_MASK    BIT(3)
  31 #define RTQ6752_PAVDDEN_MASK    BIT(0)
  32 #define RTQ6752_PAVDDAD_MASK    BIT(4)
  33 #define RTQ6752_NAVDDAD_MASK    BIT(3)
  34 #define RTQ6752_PAVDDF_MASK     BIT(3)
  35 #define RTQ6752_NAVDDF_MASK     BIT(0)
  36 #define RTQ6752_ENABLE_MASK     (BIT(RTQ6752_IDX_MAX) - 1)
  37
  38 #define RTQ6752_VOUT_MINUV      5000000
  39 #define RTQ6752_VOUT_STEPUV     50000
  40 #define RTQ6752_VOUT_NUM        47
  41 #define RTQ6752_I2CRDY_TIMEUS   1000
  42 #define RTQ6752_MINSS_TIMEUS    5000
  43
  44 struct rtq6752_priv {
  45         struct regmap *regmap;
  46         struct gpio_desc *enable_gpio;
  47         struct mutex lock;
  48         unsigned char enable_flag;
  49 };
  50
  51 static int rtq6752_set_vdd_enable(struct regulator_dev *rdev)
  52 {
  53         struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
  54         int rid = rdev_get_id(rdev), ret;
  55
  56         mutex_lock(&priv->lock);
  57         if (priv->enable_gpio) {
  58                 gpiod_set_value(priv->enable_gpio, 1);
  59
  60                 usleep_range(RTQ6752_I2CRDY_TIMEUS,
  61                              RTQ6752_I2CRDY_TIMEUS + 100);
  62         }
  63
  64         if (!priv->enable_flag) {
  65                 regcache_cache_only(priv->regmap, false);
  66                 ret = regcache_sync(priv->regmap);
  67                 if (ret) {
  68                         mutex_unlock(&priv->lock);
  69                         return ret;
  70                 }
  71         }
  72
  73         priv->enable_flag |= BIT(rid);
  74         mutex_unlock(&priv->lock);
  75
  76         return regulator_enable_regmap(rdev);
  77 }
  78
  79 static int rtq6752_set_vdd_disable(struct regulator_dev *rdev)
  80 {
  81         struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
  82         int rid = rdev_get_id(rdev), ret;
  83
  84         ret = regulator_disable_regmap(rdev);
  85         if (ret)
  86                 return ret;
  87
  88         mutex_lock(&priv->lock);
  89         priv->enable_flag &= ~BIT(rid);
  90
  91         if (!priv->enable_flag) {
  92                 regcache_cache_only(priv->regmap, true);
  93                 regcache_mark_dirty(priv->regmap);
  94         }
  95
  96         if (priv->enable_gpio)
  97                 gpiod_set_value(priv->enable_gpio, 0);
  98
  99         mutex_unlock(&priv->lock);
 100
 101         return 0;
 102 }
 103
 104 static int rtq6752_get_error_flags(struct regulator_dev *rdev,
 105                                    unsigned int *flags)
 106 {
 107         unsigned int val, events = 0;
 108         const unsigned int fault_mask[] = {
 109                 RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK };
 110         int rid = rdev_get_id(rdev), ret;
 111
 112         ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val);
 113         if (ret)
 114                 return ret;
 115
 116         if (val & fault_mask[rid])
 117                 events = REGULATOR_ERROR_REGULATION_OUT;
 118
 119         *flags = events;
 120         return 0;
 121 }
 122
 123 static const struct regulator_ops rtq6752_regulator_ops = {
 124         .list_voltage = regulator_list_voltage_linear,
 125         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 126         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 127         .enable = rtq6752_set_vdd_enable,
 128         .disable = rtq6752_set_vdd_disable,
 129         .is_enabled = regulator_is_enabled_regmap,
 130         .set_active_discharge = regulator_set_active_discharge_regmap,
 131         .get_error_flags = rtq6752_get_error_flags,
 132 };
 133
 134 static const struct regulator_desc rtq6752_regulator_descs[] = {
 135         {
 136                 .name = "rtq6752-pavdd",
 137                 .of_match = of_match_ptr("pavdd"),
 138                 .regulators_node = of_match_ptr("regulators"),
 139                 .id = RTQ6752_IDX_PAVDD,
 140                 .n_voltages = RTQ6752_VOUT_NUM,
 141                 .ops = &rtq6752_regulator_ops,
 142                 .owner = THIS_MODULE,
 143                 .min_uV = RTQ6752_VOUT_MINUV,
 144                 .uV_step = RTQ6752_VOUT_STEPUV,
 145                 .enable_time = RTQ6752_MINSS_TIMEUS,
 146                 .vsel_reg = RTQ6752_REG_PAVDD,
 147                 .vsel_mask = RTQ6752_VOUT_MASK,
 148                 .enable_reg = RTQ6752_REG_CHSWITCH,
 149                 .enable_mask = RTQ6752_PAVDDEN_MASK,
 150                 .active_discharge_reg = RTQ6752_REG_OPTION1,
 151                 .active_discharge_mask = RTQ6752_PAVDDAD_MASK,
 152                 .active_discharge_off = RTQ6752_PAVDDAD_MASK,
 153         },
 154         {
 155                 .name = "rtq6752-navdd",
 156                 .of_match = of_match_ptr("navdd"),
 157                 .regulators_node = of_match_ptr("regulators"),
 158                 .id = RTQ6752_IDX_NAVDD,
 159                 .n_voltages = RTQ6752_VOUT_NUM,
 160                 .ops = &rtq6752_regulator_ops,
 161                 .owner = THIS_MODULE,
 162                 .min_uV = RTQ6752_VOUT_MINUV,
 163                 .uV_step = RTQ6752_VOUT_STEPUV,
 164                 .enable_time = RTQ6752_MINSS_TIMEUS,
 165                 .vsel_reg = RTQ6752_REG_NAVDD,
 166                 .vsel_mask = RTQ6752_VOUT_MASK,
 167                 .enable_reg = RTQ6752_REG_CHSWITCH,
 168                 .enable_mask = RTQ6752_NAVDDEN_MASK,
 169                 .active_discharge_reg = RTQ6752_REG_OPTION1,
 170                 .active_discharge_mask = RTQ6752_NAVDDAD_MASK,
 171                 .active_discharge_off = RTQ6752_NAVDDAD_MASK,
 172         }
 173 };
 174
 175 static int rtq6752_init_device_properties(struct rtq6752_priv *priv)
 176 {
 177         u8 raw_vals[] = { 0, 0 };
 178         int ret;
 179
 180         /* Configure PAVDD on and softstart delay time to the minimum */
 181         ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals,
 182                                ARRAY_SIZE(raw_vals));
 183         if (ret)
 184                 return ret;
 185
 186         /* Configure NAVDD on and softstart delay time to the minimum */
 187         return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals,
 188                                 ARRAY_SIZE(raw_vals));
 189 }
 190
 191 static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg)
 192 {
 193         if (reg == RTQ6752_REG_FAULT)
 194                 return true;
 195         return false;
 196 }
 197
 198 static const struct reg_default rtq6752_reg_defaults[] = {
 199         { RTQ6752_REG_PAVDD, 0x14 },
 200         { RTQ6752_REG_NAVDD, 0x14 },
 201         { RTQ6752_REG_PAVDDONDLY, 0x01 },
 202         { RTQ6752_REG_PAVDDSSTIME, 0x01 },
 203         { RTQ6752_REG_NAVDDONDLY, 0x01 },
 204         { RTQ6752_REG_NAVDDSSTIME, 0x01 },
 205         { RTQ6752_REG_OPTION1, 0x07 },
 206         { RTQ6752_REG_CHSWITCH, 0x29 },
 207 };
 208
 209 static const struct regmap_config rtq6752_regmap_config = {
 210         .reg_bits = 8,
 211         .val_bits = 8,
 212         .cache_type = REGCACHE_RBTREE,
 213         .max_register = RTQ6752_REG_FAULT,
 214         .reg_defaults = rtq6752_reg_defaults,
 215         .num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults),
 216         .volatile_reg = rtq6752_is_volatile_reg,
 217 };
 218
 219 static int rtq6752_probe(struct i2c_client *i2c)
 220 {
 221         struct rtq6752_priv *priv;
 222         struct regulator_config reg_cfg = {};
 223         struct regulator_dev *rdev;
 224         int i, ret;
 225
 226         priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
 227         if (!priv)
 228                 return -ENOMEM;
 229
 230         mutex_init(&priv->lock);
 231
 232         priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable",
 233                                                     GPIOD_OUT_HIGH);
 234         if (IS_ERR(priv->enable_gpio)) {
 235                 dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
 236                 return PTR_ERR(priv->enable_gpio);
 237         }
 238
 239         usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100);
 240         /* Default EN pin to high, PAVDD and NAVDD will be on */
 241         priv->enable_flag = RTQ6752_ENABLE_MASK;
 242
 243         priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config);
 244         if (IS_ERR(priv->regmap)) {
 245                 dev_err(&i2c->dev, "Failed to init regmap\n");
 246                 return PTR_ERR(priv->regmap);
 247         }
 248
 249         ret = rtq6752_init_device_properties(priv);
 250         if (ret) {
 251                 dev_err(&i2c->dev, "Failed to init device properties\n");
 252                 return ret;
 253         }
 254
 255         reg_cfg.dev = &i2c->dev;
 256         reg_cfg.regmap = priv->regmap;
 257         reg_cfg.driver_data = priv;
 258
 259         for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) {
 260                 rdev = devm_regulator_register(&i2c->dev,
 261                                                rtq6752_regulator_descs + i,
 262                                                &reg_cfg);
 263                 if (IS_ERR(rdev)) {
 264                         dev_err(&i2c->dev, "Failed to init %d regulator\n", i);
 265                         return PTR_ERR(rdev);
 266                 }
 267         }
 268
 269         return 0;
 270 }
 271
 272 static const struct of_device_id __maybe_unused rtq6752_device_table[] = {
 273         { .compatible = "richtek,rtq6752", },
 274         {}
 275 };
 276 MODULE_DEVICE_TABLE(of, rtq6752_device_table);
 277
 278 static struct i2c_driver rtq6752_driver = {
 279         .driver = {
 280                 .name = "rtq6752",
 281                 .of_match_table = rtq6752_device_table,
 282         },
 283         .probe_new = rtq6752_probe,
 284 };
 285 module_i2c_driver(rtq6752_driver);
 286
 287 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
 288 MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver");
 289 MODULE_LICENSE("GPL v2");