drivers/regulator/rt4803.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2023 Richtek Technology Corp.
   4  *
   5  * Author: ChiYuan Huang <cy_huang@richtek.com>
   6  */
   7
   8 #include <linux/i2c.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mod_devicetable.h>
  11 #include <linux/module.h>
  12 #include <linux/property.h>
  13 #include <linux/regmap.h>
  14 #include <linux/regulator/driver.h>
  15 #include <linux/regulator/of_regulator.h>
  16
  17 #define RT4803_AUTO_MODE        1
  18 #define RT4803_FPWM_MODE        2
  19
  20 #define RT4803_REG_CONFIG       0x01
  21 #define RT4803_REG_VSELL        0x02
  22 #define RT4803_REG_VSELH        0x03
  23 #define RT4803_REG_ILIM         0x04
  24 #define RT4803_REG_STAT         0x05
  25
  26 #define RT4803_MODE_MASK        GENMASK(1, 0)
  27 #define RT4803_VSEL_MASK        GENMASK(4, 0)
  28 #define RT4803_ILIM_MASK        GENMASK(3, 0)
  29 #define RT4803_TSD_MASK         BIT(7)
  30 #define RT4803_HOTDIE_MASK      BIT(6)
  31 #define RT4803_FAULT_MASK       BIT(1)
  32 #define RT4803_PGOOD_MASK       BIT(0)
  33
  34 #define RT4803_VOUT_MINUV       2850000
  35 #define RT4803_VOUT_STEPUV      50000
  36 #define RT4803_VOUT_NUM         32
  37
  38 static int rt4803_set_mode(struct regulator_dev *rdev, unsigned int mode)
  39 {
  40         struct regmap *regmap = rdev_get_regmap(rdev);
  41         unsigned int modeval;
  42
  43         switch (mode) {
  44         case REGULATOR_MODE_NORMAL:
  45                 modeval = RT4803_AUTO_MODE;
  46                 break;
  47         case REGULATOR_MODE_FAST:
  48                 modeval = RT4803_FPWM_MODE;
  49                 break;
  50         default:
  51                 return -EINVAL;
  52         }
  53
  54         modeval <<= ffs(RT4803_MODE_MASK) - 1;
  55
  56         return regmap_update_bits(regmap, RT4803_REG_CONFIG, RT4803_MODE_MASK, modeval);
  57 }
  58
  59 static unsigned int rt4803_get_mode(struct regulator_dev *rdev)
  60 {
  61         struct regmap *regmap = rdev_get_regmap(rdev);
  62         unsigned int modeval;
  63         int ret;
  64
  65         ret = regmap_read(regmap, RT4803_REG_CONFIG, &modeval);
  66         if (ret)
  67                 return REGULATOR_MODE_INVALID;
  68
  69         modeval >>= ffs(RT4803_MODE_MASK) - 1;
  70
  71         switch (modeval) {
  72         case RT4803_AUTO_MODE:
  73                 return REGULATOR_MODE_NORMAL;
  74         case RT4803_FPWM_MODE:
  75                 return REGULATOR_MODE_FAST;
  76         default:
  77                 return REGULATOR_MODE_INVALID;
  78         }
  79 }
  80
  81 static int rt4803_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
  82 {
  83         struct regmap *regmap = rdev_get_regmap(rdev);
  84         unsigned int state, events = 0;
  85         int ret;
  86
  87         ret = regmap_read(regmap, RT4803_REG_STAT, &state);
  88         if (ret)
  89                 return ret;
  90
  91         if (state & RT4803_PGOOD_MASK)
  92                 goto out_error_flag;
  93
  94         if (state & RT4803_FAULT_MASK)
  95                 events |= REGULATOR_ERROR_FAIL;
  96
  97         if (state & RT4803_HOTDIE_MASK)
  98                 events |= REGULATOR_ERROR_OVER_TEMP_WARN;
  99
 100         if (state & RT4803_TSD_MASK)
 101                 events |= REGULATOR_ERROR_OVER_TEMP;
 102
 103 out_error_flag:
 104         *flags = events;
 105         return 0;
 106 }
 107
 108 static int rt4803_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 109 {
 110         struct regmap *regmap = rdev_get_regmap(rdev);
 111         unsigned int reg, vsel;
 112
 113         if (rdev->desc->vsel_reg == RT4803_REG_VSELL)
 114                 reg = RT4803_REG_VSELH;
 115         else
 116                 reg = RT4803_REG_VSELL;
 117
 118         vsel = (uV - rdev->desc->min_uV) / rdev->desc->uV_step;
 119         vsel <<= ffs(RT4803_VSEL_MASK) - 1;
 120
 121         return regmap_update_bits(regmap, reg, RT4803_VSEL_MASK, vsel);
 122 }
 123
 124 static const struct regulator_ops rt4803_regulator_ops = {
 125         .list_voltage = regulator_list_voltage_linear,
 126         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 127         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 128         .set_mode = rt4803_set_mode,
 129         .get_mode = rt4803_get_mode,
 130         .get_error_flags = rt4803_get_error_flags,
 131         .set_suspend_voltage = rt4803_set_suspend_voltage,
 132 };
 133
 134 static unsigned int rt4803_of_map_mode(unsigned int mode)
 135 {
 136         switch (mode) {
 137         case RT4803_AUTO_MODE:
 138                 return REGULATOR_MODE_NORMAL;
 139         case RT4803_FPWM_MODE:
 140                 return REGULATOR_MODE_FAST;
 141         default:
 142                 return REGULATOR_MODE_INVALID;
 143         }
 144 }
 145
 146 static const struct regmap_config rt4803_regmap_config = {
 147         .reg_bits = 8,
 148         .val_bits = 8,
 149         .max_register = RT4803_REG_STAT,
 150 };
 151
 152 static int rt4803_probe(struct i2c_client *i2c)
 153 {
 154         struct device *dev = &i2c->dev;
 155         struct regmap *regmap;
 156         struct regulator_desc *desc;
 157         struct regulator_config cfg = {};
 158         struct regulator_dev *rdev;
 159         bool vsel_act_high;
 160         int ret;
 161
 162         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 163         if (!desc)
 164                 return -ENOMEM;
 165
 166         regmap = devm_regmap_init_i2c(i2c, &rt4803_regmap_config);
 167         if (IS_ERR(regmap))
 168                 return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
 169
 170         /* Always configure the input current limit to max 5A at initial */
 171         ret = regmap_update_bits(regmap, RT4803_REG_ILIM, RT4803_ILIM_MASK, 0xff);
 172         if (ret)
 173                 return dev_err_probe(dev, ret, "Failed to config ILIM to max\n");
 174
 175         vsel_act_high = device_property_read_bool(dev, "richtek,vsel-active-high");
 176
 177         desc->name = "rt4803-regulator";
 178         desc->type = REGULATOR_VOLTAGE;
 179         desc->owner = THIS_MODULE;
 180         desc->ops = &rt4803_regulator_ops;
 181         desc->min_uV = RT4803_VOUT_MINUV;
 182         desc->uV_step = RT4803_VOUT_STEPUV;
 183         desc->n_voltages = RT4803_VOUT_NUM;
 184         desc->vsel_mask = RT4803_VSEL_MASK;
 185         desc->of_map_mode = rt4803_of_map_mode;
 186         if (vsel_act_high)
 187                 desc->vsel_reg = RT4803_REG_VSELH;
 188         else
 189                 desc->vsel_reg = RT4803_REG_VSELL;
 190
 191         cfg.dev = dev;
 192         cfg.of_node = dev_of_node(dev);
 193         cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc);
 194
 195         rdev = devm_regulator_register(dev, desc, &cfg);
 196         return PTR_ERR_OR_ZERO(rdev);
 197 }
 198
 199 static const struct of_device_id rt4803_device_match_table[] = {
 200         { .compatible = "richtek,rt4803" },
 201         {}
 202 };
 203 MODULE_DEVICE_TABLE(of, rt4803_device_match_table);
 204
 205 static struct i2c_driver rt4803_driver = {
 206         .driver = {
 207                 .name = "rt4803",
 208                 .of_match_table = rt4803_device_match_table,
 209         },
 210         .probe = rt4803_probe,
 211 };
 212 module_i2c_driver(rt4803_driver);
 213
 214 MODULE_DESCRIPTION("Richtek RT4803 voltage regulator driver");
 215 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
 216 MODULE_LICENSE("GPL");