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0001 // SPDX-License-Identifier: GPL-2.0
0002 //
0003 // SY8824C/SY8824E regulator driver
0004 //
0005 // Copyright (C) 2019 Synaptics Incorporated
0006 //
0007 // Author: Jisheng Zhang <jszhang@kernel.org>
0008 
0009 #include <linux/module.h>
0010 #include <linux/i2c.h>
0011 #include <linux/of_device.h>
0012 #include <linux/regmap.h>
0013 #include <linux/regulator/driver.h>
0014 #include <linux/regulator/of_regulator.h>
0015 
0016 #define SY8824C_BUCK_EN     (1 << 7)
0017 #define SY8824C_MODE        (1 << 6)
0018 
0019 struct sy8824_config {
0020     /* registers */
0021     unsigned int vol_reg;
0022     unsigned int mode_reg;
0023     unsigned int enable_reg;
0024     /* Voltage range and step(linear) */
0025     unsigned int vsel_min;
0026     unsigned int vsel_step;
0027     unsigned int vsel_count;
0028     const struct regmap_config *config;
0029 };
0030 
0031 struct sy8824_device_info {
0032     struct device *dev;
0033     struct regulator_desc desc;
0034     struct regulator_init_data *regulator;
0035     const struct sy8824_config *cfg;
0036 };
0037 
0038 static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
0039 {
0040     struct sy8824_device_info *di = rdev_get_drvdata(rdev);
0041     const struct sy8824_config *cfg = di->cfg;
0042 
0043     switch (mode) {
0044     case REGULATOR_MODE_FAST:
0045         regmap_update_bits(rdev->regmap, cfg->mode_reg,
0046                    SY8824C_MODE, SY8824C_MODE);
0047         break;
0048     case REGULATOR_MODE_NORMAL:
0049         regmap_update_bits(rdev->regmap, cfg->mode_reg,
0050                    SY8824C_MODE, 0);
0051         break;
0052     default:
0053         return -EINVAL;
0054     }
0055     return 0;
0056 }
0057 
0058 static unsigned int sy8824_get_mode(struct regulator_dev *rdev)
0059 {
0060     struct sy8824_device_info *di = rdev_get_drvdata(rdev);
0061     const struct sy8824_config *cfg = di->cfg;
0062     u32 val;
0063     int ret = 0;
0064 
0065     ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
0066     if (ret < 0)
0067         return ret;
0068     if (val & SY8824C_MODE)
0069         return REGULATOR_MODE_FAST;
0070     else
0071         return REGULATOR_MODE_NORMAL;
0072 }
0073 
0074 static const struct regulator_ops sy8824_regulator_ops = {
0075     .set_voltage_sel = regulator_set_voltage_sel_regmap,
0076     .get_voltage_sel = regulator_get_voltage_sel_regmap,
0077     .set_voltage_time_sel = regulator_set_voltage_time_sel,
0078     .map_voltage = regulator_map_voltage_linear,
0079     .list_voltage = regulator_list_voltage_linear,
0080     .enable = regulator_enable_regmap,
0081     .disable = regulator_disable_regmap,
0082     .is_enabled = regulator_is_enabled_regmap,
0083     .set_mode = sy8824_set_mode,
0084     .get_mode = sy8824_get_mode,
0085 };
0086 
0087 static int sy8824_regulator_register(struct sy8824_device_info *di,
0088             struct regulator_config *config)
0089 {
0090     struct regulator_desc *rdesc = &di->desc;
0091     const struct sy8824_config *cfg = di->cfg;
0092     struct regulator_dev *rdev;
0093 
0094     rdesc->name = "sy8824-reg";
0095     rdesc->supply_name = "vin";
0096     rdesc->ops = &sy8824_regulator_ops;
0097     rdesc->type = REGULATOR_VOLTAGE;
0098     rdesc->n_voltages = cfg->vsel_count;
0099     rdesc->enable_reg = cfg->enable_reg;
0100     rdesc->enable_mask = SY8824C_BUCK_EN;
0101     rdesc->min_uV = cfg->vsel_min;
0102     rdesc->uV_step = cfg->vsel_step;
0103     rdesc->vsel_reg = cfg->vol_reg;
0104     rdesc->vsel_mask = cfg->vsel_count - 1;
0105     rdesc->owner = THIS_MODULE;
0106 
0107     rdev = devm_regulator_register(di->dev, &di->desc, config);
0108     return PTR_ERR_OR_ZERO(rdev);
0109 }
0110 
0111 static const struct regmap_config sy8824_regmap_config = {
0112     .reg_bits = 8,
0113     .val_bits = 8,
0114     .num_reg_defaults_raw = 1,
0115     .cache_type = REGCACHE_FLAT,
0116 };
0117 
0118 static const struct regmap_config sy20276_regmap_config = {
0119     .reg_bits = 8,
0120     .val_bits = 8,
0121     .num_reg_defaults_raw = 2,
0122     .cache_type = REGCACHE_FLAT,
0123 };
0124 
0125 static int sy8824_i2c_probe(struct i2c_client *client)
0126 {
0127     struct device *dev = &client->dev;
0128     struct device_node *np = dev->of_node;
0129     struct sy8824_device_info *di;
0130     struct regulator_config config = { };
0131     struct regmap *regmap;
0132     int ret;
0133 
0134     di = devm_kzalloc(dev, sizeof(struct sy8824_device_info), GFP_KERNEL);
0135     if (!di)
0136         return -ENOMEM;
0137 
0138     di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
0139     if (!di->regulator) {
0140         dev_err(dev, "Platform data not found!\n");
0141         return -EINVAL;
0142     }
0143 
0144     di->dev = dev;
0145     di->cfg = of_device_get_match_data(dev);
0146 
0147     regmap = devm_regmap_init_i2c(client, di->cfg->config);
0148     if (IS_ERR(regmap)) {
0149         dev_err(dev, "Failed to allocate regmap!\n");
0150         return PTR_ERR(regmap);
0151     }
0152     i2c_set_clientdata(client, di);
0153 
0154     config.dev = di->dev;
0155     config.init_data = di->regulator;
0156     config.regmap = regmap;
0157     config.driver_data = di;
0158     config.of_node = np;
0159 
0160     ret = sy8824_regulator_register(di, &config);
0161     if (ret < 0)
0162         dev_err(dev, "Failed to register regulator!\n");
0163     return ret;
0164 }
0165 
0166 static const struct sy8824_config sy8824c_cfg = {
0167     .vol_reg = 0x00,
0168     .mode_reg = 0x00,
0169     .enable_reg = 0x00,
0170     .vsel_min = 762500,
0171     .vsel_step = 12500,
0172     .vsel_count = 64,
0173     .config = &sy8824_regmap_config,
0174 };
0175 
0176 static const struct sy8824_config sy8824e_cfg = {
0177     .vol_reg = 0x00,
0178     .mode_reg = 0x00,
0179     .enable_reg = 0x00,
0180     .vsel_min = 700000,
0181     .vsel_step = 12500,
0182     .vsel_count = 64,
0183     .config = &sy8824_regmap_config,
0184 };
0185 
0186 static const struct sy8824_config sy20276_cfg = {
0187     .vol_reg = 0x00,
0188     .mode_reg = 0x01,
0189     .enable_reg = 0x01,
0190     .vsel_min = 600000,
0191     .vsel_step = 10000,
0192     .vsel_count = 128,
0193     .config = &sy20276_regmap_config,
0194 };
0195 
0196 static const struct sy8824_config sy20278_cfg = {
0197     .vol_reg = 0x00,
0198     .mode_reg = 0x01,
0199     .enable_reg = 0x01,
0200     .vsel_min = 762500,
0201     .vsel_step = 12500,
0202     .vsel_count = 64,
0203     .config = &sy20276_regmap_config,
0204 };
0205 
0206 static const struct of_device_id sy8824_dt_ids[] = {
0207     {
0208         .compatible = "silergy,sy8824c",
0209         .data = &sy8824c_cfg
0210     },
0211     {
0212         .compatible = "silergy,sy8824e",
0213         .data = &sy8824e_cfg
0214     },
0215     {
0216         .compatible = "silergy,sy20276",
0217         .data = &sy20276_cfg
0218     },
0219     {
0220         .compatible = "silergy,sy20278",
0221         .data = &sy20278_cfg
0222     },
0223     { }
0224 };
0225 MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
0226 
0227 static const struct i2c_device_id sy8824_id[] = {
0228     { "sy8824", },
0229     { },
0230 };
0231 MODULE_DEVICE_TABLE(i2c, sy8824_id);
0232 
0233 static struct i2c_driver sy8824_regulator_driver = {
0234     .driver = {
0235         .name = "sy8824-regulator",
0236         .of_match_table = of_match_ptr(sy8824_dt_ids),
0237     },
0238     .probe_new = sy8824_i2c_probe,
0239     .id_table = sy8824_id,
0240 };
0241 module_i2c_driver(sy8824_regulator_driver);
0242 
0243 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
0244 MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
0245 MODULE_LICENSE("GPL v2");
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