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.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/of_regulator.h>
  15
  16 #define SY8824C_BUCK_EN         (1 << 7)
  17 #define SY8824C_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         const struct regmap_config *config;
  29 };
  30
  31 struct sy8824_device_info {
  32         struct device *dev;
  33         struct regulator_desc desc;
  34         struct regulator_init_data *regulator;
  35         const struct sy8824_config *cfg;
  36 };
  37
  38 static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
  39 {
  40         struct sy8824_device_info *di = rdev_get_drvdata(rdev);
  41         const struct sy8824_config *cfg = di->cfg;
  42
  43         switch (mode) {
  44         case REGULATOR_MODE_FAST:
  45                 regmap_update_bits(rdev->regmap, cfg->mode_reg,
  46                                    SY8824C_MODE, SY8824C_MODE);
  47                 break;
  48         case REGULATOR_MODE_NORMAL:
  49                 regmap_update_bits(rdev->regmap, cfg->mode_reg,
  50                                    SY8824C_MODE, 0);
  51                 break;
  52         default:
  53                 return -EINVAL;
  54         }
  55         return 0;
  56 }
  57
  58 static unsigned int sy8824_get_mode(struct regulator_dev *rdev)
  59 {
  60         struct sy8824_device_info *di = rdev_get_drvdata(rdev);
  61         const struct sy8824_config *cfg = di->cfg;
  62         u32 val;
  63         int ret = 0;
  64
  65         ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
  66         if (ret < 0)
  67                 return ret;
  68         if (val & SY8824C_MODE)
  69                 return REGULATOR_MODE_FAST;
  70         else
  71                 return REGULATOR_MODE_NORMAL;
  72 }
  73
  74 static const struct regulator_ops sy8824_regulator_ops = {
  75         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  76         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  77         .set_voltage_time_sel = regulator_set_voltage_time_sel,
  78         .map_voltage = regulator_map_voltage_linear,
  79         .list_voltage = regulator_list_voltage_linear,
  80         .enable = regulator_enable_regmap,
  81         .disable = regulator_disable_regmap,
  82         .is_enabled = regulator_is_enabled_regmap,
  83         .set_mode = sy8824_set_mode,
  84         .get_mode = sy8824_get_mode,
  85 };
  86
  87 static int sy8824_regulator_register(struct sy8824_device_info *di,
  88                         struct regulator_config *config)
  89 {
  90         struct regulator_desc *rdesc = &di->desc;
  91         const struct sy8824_config *cfg = di->cfg;
  92         struct regulator_dev *rdev;
  93
  94         rdesc->name = "sy8824-reg";
  95         rdesc->supply_name = "vin";
  96         rdesc->ops = &sy8824_regulator_ops;
  97         rdesc->type = REGULATOR_VOLTAGE;
  98         rdesc->n_voltages = cfg->vsel_count;
  99         rdesc->enable_reg = cfg->enable_reg;
 100         rdesc->enable_mask = SY8824C_BUCK_EN;
 101         rdesc->min_uV = cfg->vsel_min;
 102         rdesc->uV_step = cfg->vsel_step;
 103         rdesc->vsel_reg = cfg->vol_reg;
 104         rdesc->vsel_mask = cfg->vsel_count - 1;
 105         rdesc->owner = THIS_MODULE;
 106
 107         rdev = devm_regulator_register(di->dev, &di->desc, config);
 108         return PTR_ERR_OR_ZERO(rdev);
 109 }
 110
 111 static const struct regmap_config sy8824_regmap_config = {
 112         .reg_bits = 8,
 113         .val_bits = 8,
 114         .num_reg_defaults_raw = 1,
 115         .cache_type = REGCACHE_FLAT,
 116 };
 117
 118 static const struct regmap_config sy20276_regmap_config = {
 119         .reg_bits = 8,
 120         .val_bits = 8,
 121         .num_reg_defaults_raw = 2,
 122         .cache_type = REGCACHE_FLAT,
 123 };
 124
 125 static int sy8824_i2c_probe(struct i2c_client *client)
 126 {
 127         struct device *dev = &client->dev;
 128         struct device_node *np = dev->of_node;
 129         struct sy8824_device_info *di;
 130         struct regulator_config config = { };
 131         struct regmap *regmap;
 132         int ret;
 133
 134         di = devm_kzalloc(dev, sizeof(struct sy8824_device_info), GFP_KERNEL);
 135         if (!di)
 136                 return -ENOMEM;
 137
 138         di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
 139         if (!di->regulator) {
 140                 dev_err(dev, "Platform data not found!\n");
 141                 return -EINVAL;
 142         }
 143
 144         di->dev = dev;
 145         di->cfg = i2c_get_match_data(client);
 146
 147         regmap = devm_regmap_init_i2c(client, di->cfg->config);
 148         if (IS_ERR(regmap)) {
 149                 dev_err(dev, "Failed to allocate regmap!\n");
 150                 return PTR_ERR(regmap);
 151         }
 152         i2c_set_clientdata(client, di);
 153
 154         config.dev = di->dev;
 155         config.init_data = di->regulator;
 156         config.regmap = regmap;
 157         config.driver_data = di;
 158         config.of_node = np;
 159
 160         ret = sy8824_regulator_register(di, &config);
 161         if (ret < 0)
 162                 dev_err(dev, "Failed to register regulator!\n");
 163         return ret;
 164 }
 165
 166 static const struct sy8824_config sy8824c_cfg = {
 167         .vol_reg = 0x00,
 168         .mode_reg = 0x00,
 169         .enable_reg = 0x00,
 170         .vsel_min = 762500,
 171         .vsel_step = 12500,
 172         .vsel_count = 64,
 173         .config = &sy8824_regmap_config,
 174 };
 175
 176 static const struct sy8824_config sy8824e_cfg = {
 177         .vol_reg = 0x00,
 178         .mode_reg = 0x00,
 179         .enable_reg = 0x00,
 180         .vsel_min = 700000,
 181         .vsel_step = 12500,
 182         .vsel_count = 64,
 183         .config = &sy8824_regmap_config,
 184 };
 185
 186 static const struct sy8824_config sy20276_cfg = {
 187         .vol_reg = 0x00,
 188         .mode_reg = 0x01,
 189         .enable_reg = 0x01,
 190         .vsel_min = 600000,
 191         .vsel_step = 10000,
 192         .vsel_count = 128,
 193         .config = &sy20276_regmap_config,
 194 };
 195
 196 static const struct sy8824_config sy20278_cfg = {
 197         .vol_reg = 0x00,
 198         .mode_reg = 0x01,
 199         .enable_reg = 0x01,
 200         .vsel_min = 762500,
 201         .vsel_step = 12500,
 202         .vsel_count = 64,
 203         .config = &sy20276_regmap_config,
 204 };
 205
 206 static const struct of_device_id sy8824_dt_ids[] = {
 207         { .compatible = "silergy,sy8824c", .data = &sy8824c_cfg },
 208         { .compatible = "silergy,sy8824e", .data = &sy8824e_cfg },
 209         { .compatible = "silergy,sy20276", .data = &sy20276_cfg },
 210         { .compatible = "silergy,sy20278", .data = &sy20278_cfg },
 211         { }
 212 };
 213 MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
 214
 215 static const struct i2c_device_id sy8824_id[] = {
 216         { "sy8824", (kernel_ulong_t)&sy8824c_cfg },
 217         { }
 218 };
 219 MODULE_DEVICE_TABLE(i2c, sy8824_id);
 220
 221 static struct i2c_driver sy8824_regulator_driver = {
 222         .driver = {
 223                 .name = "sy8824-regulator",
 224                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 225                 .of_match_table = sy8824_dt_ids,
 226         },
 227         .probe = sy8824_i2c_probe,
 228         .id_table = sy8824_id,
 229 };
 230 module_i2c_driver(sy8824_regulator_driver);
 231
 232 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
 233 MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
 234 MODULE_LICENSE("GPL v2");