drivers/regulator/sy8824x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // SY8824C/SY8824E regulator driver
   4 //
   5 // Copyright (C) 2019 Synaptics Incorporated
   6 //
   7 // Author: Jisheng Zhang <jszhang@kernel.org>
   8
   9 #include <linux/module.h>
  10 #include <linux/i2c.h>
  11 #include <linux/of_device.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/of_regulator.h>
  15
  16 #define BUCK_EN         (1 << 7)
  17 #define MODE            (1 << 6)
  18
  19 struct sy8824_config {
  20         /* registers */
  21         unsigned int vol_reg;
  22         unsigned int mode_reg;
  23         unsigned int enable_reg;
  24         /* Voltage range and step(linear) */
  25         unsigned int vsel_min;
  26         unsigned int vsel_step;
  27         unsigned int vsel_count;
  28 };
  29
  30 struct sy8824_device_info {
  31         struct device *dev;
  32         struct regulator_desc desc;
  33         struct regulator_init_data *regulator;
  34         const struct sy8824_config *cfg;
  35 };
  36
  37 static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
  38 {
  39         struct sy8824_device_info *di = rdev_get_drvdata(rdev);
  40         const struct sy8824_config *cfg = di->cfg;
  41
  42         switch (mode) {
  43         case REGULATOR_MODE_FAST:
  44                 regmap_update_bits(rdev->regmap, cfg->mode_reg, MODE, MODE);
  45                 break;
  46         case REGULATOR_MODE_NORMAL:
  47                 regmap_update_bits(rdev->regmap, cfg->mode_reg, MODE, 0);
  48                 break;
  49         default:
  50                 return -EINVAL;
  51         }
  52         return 0;
  53 }
  54
  55 static unsigned int sy8824_get_mode(struct regulator_dev *rdev)
  56 {
  57         struct sy8824_device_info *di = rdev_get_drvdata(rdev);
  58         const struct sy8824_config *cfg = di->cfg;
  59         u32 val;
  60         int ret = 0;
  61
  62         ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
  63         if (ret < 0)
  64                 return ret;
  65         if (val & MODE)
  66                 return REGULATOR_MODE_FAST;
  67         else
  68                 return REGULATOR_MODE_NORMAL;
  69 }
  70
  71 static const struct regulator_ops sy8824_regulator_ops = {
  72         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  73         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  74         .set_voltage_time_sel = regulator_set_voltage_time_sel,
  75         .map_voltage = regulator_map_voltage_linear,
  76         .list_voltage = regulator_list_voltage_linear,
  77         .enable = regulator_enable_regmap,
  78         .disable = regulator_disable_regmap,
  79         .is_enabled = regulator_is_enabled_regmap,
  80         .set_mode = sy8824_set_mode,
  81         .get_mode = sy8824_get_mode,
  82 };
  83
  84 static int sy8824_regulator_register(struct sy8824_device_info *di,
  85                         struct regulator_config *config)
  86 {
  87         struct regulator_desc *rdesc = &di->desc;
  88         const struct sy8824_config *cfg = di->cfg;
  89         struct regulator_dev *rdev;
  90
  91         rdesc->name = "sy8824-reg";
  92         rdesc->supply_name = "vin";
  93         rdesc->ops = &sy8824_regulator_ops;
  94         rdesc->type = REGULATOR_VOLTAGE;
  95         rdesc->n_voltages = cfg->vsel_count;
  96         rdesc->enable_reg = cfg->enable_reg;
  97         rdesc->enable_mask = BUCK_EN;
  98         rdesc->min_uV = cfg->vsel_min;
  99         rdesc->uV_step = cfg->vsel_step;
 100         rdesc->vsel_reg = cfg->vol_reg;
 101         rdesc->vsel_mask = cfg->vsel_count - 1;
 102         rdesc->owner = THIS_MODULE;
 103
 104         rdev = devm_regulator_register(di->dev, &di->desc, config);
 105         return PTR_ERR_OR_ZERO(rdev);
 106 }
 107
 108 static const struct regmap_config sy8824_regmap_config = {
 109         .reg_bits = 8,
 110         .val_bits = 8,
 111 };
 112
 113 static int sy8824_i2c_probe(struct i2c_client *client,
 114                             const struct i2c_device_id *id)
 115 {
 116         struct device *dev = &client->dev;
 117         struct device_node *np = dev->of_node;
 118         struct sy8824_device_info *di;
 119         struct regulator_config config = { };
 120         struct regmap *regmap;
 121         int ret;
 122
 123         di = devm_kzalloc(dev, sizeof(struct sy8824_device_info), GFP_KERNEL);
 124         if (!di)
 125                 return -ENOMEM;
 126
 127         di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
 128         if (!di->regulator) {
 129                 dev_err(dev, "Platform data not found!\n");
 130                 return -EINVAL;
 131         }
 132
 133         di->dev = dev;
 134         di->cfg = of_device_get_match_data(dev);
 135
 136         regmap = devm_regmap_init_i2c(client, &sy8824_regmap_config);
 137         if (IS_ERR(regmap)) {
 138                 dev_err(dev, "Failed to allocate regmap!\n");
 139                 return PTR_ERR(regmap);
 140         }
 141         i2c_set_clientdata(client, di);
 142
 143         config.dev = di->dev;
 144         config.init_data = di->regulator;
 145         config.regmap = regmap;
 146         config.driver_data = di;
 147         config.of_node = np;
 148
 149         ret = sy8824_regulator_register(di, &config);
 150         if (ret < 0)
 151                 dev_err(dev, "Failed to register regulator!\n");
 152         return ret;
 153 }
 154
 155 static const struct sy8824_config sy8824c_cfg = {
 156         .vol_reg = 0x00,
 157         .mode_reg = 0x00,
 158         .enable_reg = 0x00,
 159         .vsel_min = 762500,
 160         .vsel_step = 12500,
 161         .vsel_count = 64,
 162 };
 163
 164 static const struct sy8824_config sy8824e_cfg = {
 165         .vol_reg = 0x00,
 166         .mode_reg = 0x00,
 167         .enable_reg = 0x00,
 168         .vsel_min = 700000,
 169         .vsel_step = 12500,
 170         .vsel_count = 64,
 171 };
 172
 173 static const struct sy8824_config sy20276_cfg = {
 174         .vol_reg = 0x00,
 175         .mode_reg = 0x01,
 176         .enable_reg = 0x01,
 177         .vsel_min = 600000,
 178         .vsel_step = 10000,
 179         .vsel_count = 128,
 180 };
 181
 182 static const struct sy8824_config sy20278_cfg = {
 183         .vol_reg = 0x00,
 184         .mode_reg = 0x01,
 185         .enable_reg = 0x01,
 186         .vsel_min = 762500,
 187         .vsel_step = 12500,
 188         .vsel_count = 64,
 189 };
 190
 191 static const struct of_device_id sy8824_dt_ids[] = {
 192         {
 193                 .compatible = "silergy,sy8824c",
 194                 .data = &sy8824c_cfg
 195         },
 196         {
 197                 .compatible = "silergy,sy8824e",
 198                 .data = &sy8824e_cfg
 199         },
 200         {
 201                 .compatible = "silergy,sy20276",
 202                 .data = &sy20276_cfg
 203         },
 204         {
 205                 .compatible = "silergy,sy20278",
 206                 .data = &sy20278_cfg
 207         },
 208         { }
 209 };
 210 MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
 211
 212 static const struct i2c_device_id sy8824_id[] = {
 213         { "sy8824", },
 214         { },
 215 };
 216 MODULE_DEVICE_TABLE(i2c, sy8824_id);
 217
 218 static struct i2c_driver sy8824_regulator_driver = {
 219         .driver = {
 220                 .name = "sy8824-regulator",
 221                 .of_match_table = of_match_ptr(sy8824_dt_ids),
 222         },
 223         .probe = sy8824_i2c_probe,
 224         .id_table = sy8824_id,
 225 };
 226 module_i2c_driver(sy8824_regulator_driver);
 227
 228 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
 229 MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
 230 MODULE_LICENSE("GPL v2");