drivers/regulator/mp886x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // MP8869 regulator driver
   4 //
   5 // Copyright (C) 2020 Synaptics Incorporated
   6 //
   7 // Author: Jisheng Zhang <jszhang@kernel.org>
   8
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/i2c.h>
  11 #include <linux/module.h>
  12 #include <linux/of_device.h>
  13 #include <linux/regmap.h>
  14 #include <linux/regulator/driver.h>
  15 #include <linux/regulator/of_regulator.h>
  16
  17 #define MP886X_VSEL             0x00
  18 #define  MP886X_V_BOOT          (1 << 7)
  19 #define MP886X_SYSCNTLREG1      0x01
  20 #define  MP886X_MODE            (1 << 0)
  21 #define  MP886X_GO              (1 << 6)
  22 #define  MP886X_EN              (1 << 7)
  23
  24 struct mp886x_device_info {
  25         struct device *dev;
  26         struct regulator_desc desc;
  27         struct regulator_init_data *regulator;
  28         struct gpio_desc *en_gpio;
  29         u32 r[2];
  30         unsigned int sel;
  31 };
  32
  33 static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
  34 {
  35         switch (mode) {
  36         case REGULATOR_MODE_FAST:
  37                 regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
  38                                    MP886X_MODE, MP886X_MODE);
  39                 break;
  40         case REGULATOR_MODE_NORMAL:
  41                 regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
  42                                    MP886X_MODE, 0);
  43                 break;
  44         default:
  45                 return -EINVAL;
  46         }
  47         return 0;
  48 }
  49
  50 static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
  51 {
  52         u32 val;
  53         int ret;
  54
  55         ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
  56         if (ret < 0)
  57                 return ret;
  58         if (val & MP886X_MODE)
  59                 return REGULATOR_MODE_FAST;
  60         else
  61                 return REGULATOR_MODE_NORMAL;
  62 }
  63
  64 static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
  65 {
  66         int ret;
  67
  68         ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
  69                                  MP886X_GO, MP886X_GO);
  70         if (ret < 0)
  71                 return ret;
  72
  73         sel <<= ffs(rdev->desc->vsel_mask) - 1;
  74         return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
  75                                   MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
  76 }
  77
  78 static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
  79 {
  80         u32 tmp = uv * r1 / r2;
  81
  82         return uv + tmp;
  83 }
  84
  85 static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
  86 {
  87         struct mp886x_device_info *di = rdev_get_drvdata(rdev);
  88         int ret, uv;
  89         unsigned int val;
  90         bool fbloop;
  91
  92         ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
  93         if (ret)
  94                 return ret;
  95
  96         fbloop = val & MP886X_V_BOOT;
  97         if (fbloop) {
  98                 uv = rdev->desc->min_uV;
  99                 uv = mp8869_scale(uv, di->r[0], di->r[1]);
 100                 return regulator_map_voltage_linear(rdev, uv, uv);
 101         }
 102
 103         val &= rdev->desc->vsel_mask;
 104         val >>= ffs(rdev->desc->vsel_mask) - 1;
 105
 106         return val;
 107 }
 108
 109 static const struct regulator_ops mp8869_regulator_ops = {
 110         .set_voltage_sel = mp8869_set_voltage_sel,
 111         .get_voltage_sel = mp8869_get_voltage_sel,
 112         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 113         .map_voltage = regulator_map_voltage_linear,
 114         .list_voltage = regulator_list_voltage_linear,
 115         .enable = regulator_enable_regmap,
 116         .disable = regulator_disable_regmap,
 117         .is_enabled = regulator_is_enabled_regmap,
 118         .set_mode = mp886x_set_mode,
 119         .get_mode = mp886x_get_mode,
 120 };
 121
 122 static int mp886x_regulator_register(struct mp886x_device_info *di,
 123                                      struct regulator_config *config)
 124 {
 125         struct regulator_desc *rdesc = &di->desc;
 126         struct regulator_dev *rdev;
 127
 128         rdesc->name = "mp886x-reg";
 129         rdesc->supply_name = "vin";
 130         rdesc->ops = of_device_get_match_data(di->dev);
 131         rdesc->type = REGULATOR_VOLTAGE;
 132         rdesc->n_voltages = 128;
 133         rdesc->enable_reg = MP886X_SYSCNTLREG1;
 134         rdesc->enable_mask = MP886X_EN;
 135         rdesc->min_uV = 600000;
 136         rdesc->uV_step = 10000;
 137         rdesc->vsel_reg = MP886X_VSEL;
 138         rdesc->vsel_mask = 0x3f;
 139         rdesc->owner = THIS_MODULE;
 140
 141         rdev = devm_regulator_register(di->dev, &di->desc, config);
 142         if (IS_ERR(rdev))
 143                 return PTR_ERR(rdev);
 144         di->sel = rdesc->ops->get_voltage_sel(rdev);
 145         return 0;
 146 }
 147
 148 static const struct regmap_config mp886x_regmap_config = {
 149         .reg_bits = 8,
 150         .val_bits = 8,
 151 };
 152
 153 static int mp886x_i2c_probe(struct i2c_client *client,
 154                             const struct i2c_device_id *id)
 155 {
 156         struct device *dev = &client->dev;
 157         struct device_node *np = dev->of_node;
 158         struct mp886x_device_info *di;
 159         struct regulator_config config = { };
 160         struct regmap *regmap;
 161         int ret;
 162
 163         di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL);
 164         if (!di)
 165                 return -ENOMEM;
 166
 167         di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
 168         if (!di->regulator) {
 169                 dev_err(dev, "Platform data not found!\n");
 170                 return -EINVAL;
 171         }
 172
 173         ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
 174                                          di->r, 2);
 175         if (ret)
 176                 return ret;
 177
 178         di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
 179         if (IS_ERR(di->en_gpio))
 180                 return PTR_ERR(di->en_gpio);
 181
 182         di->dev = dev;
 183
 184         regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
 185         if (IS_ERR(regmap)) {
 186                 dev_err(dev, "Failed to allocate regmap!\n");
 187                 return PTR_ERR(regmap);
 188         }
 189         i2c_set_clientdata(client, di);
 190
 191         config.dev = di->dev;
 192         config.init_data = di->regulator;
 193         config.regmap = regmap;
 194         config.driver_data = di;
 195         config.of_node = np;
 196
 197         ret = mp886x_regulator_register(di, &config);
 198         if (ret < 0)
 199                 dev_err(dev, "Failed to register regulator!\n");
 200         return ret;
 201 }
 202
 203 static const struct of_device_id mp886x_dt_ids[] = {
 204         {
 205                 .compatible = "mps,mp8869",
 206                 .data = &mp8869_regulator_ops
 207         },
 208         { }
 209 };
 210 MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
 211
 212 static const struct i2c_device_id mp886x_id[] = {
 213         { "mp886x", },
 214         { },
 215 };
 216 MODULE_DEVICE_TABLE(i2c, mp886x_id);
 217
 218 static struct i2c_driver mp886x_regulator_driver = {
 219         .driver = {
 220                 .name = "mp886x-regulator",
 221                 .of_match_table = of_match_ptr(mp886x_dt_ids),
 222         },
 223         .probe = mp886x_i2c_probe,
 224         .id_table = mp886x_id,
 225 };
 226 module_i2c_driver(mp886x_regulator_driver);
 227
 228 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
 229 MODULE_DESCRIPTION("MP886x regulator driver");
 230 MODULE_LICENSE("GPL v2");