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1// SPDX-License-Identifier: GPL-2.02//3// SY8824C/SY8824E regulator driver4//5// Copyright (C) 2019 Synaptics Incorporated6//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 19struct 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 31struct 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 38static 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 58static 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 else71 return REGULATOR_MODE_NORMAL;72}73 74static 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 87static 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 111static 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 118static 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 125static 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 166static 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 176static 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 186static 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 196static 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 206static 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};213MODULE_DEVICE_TABLE(of, sy8824_dt_ids);214 215static const struct i2c_device_id sy8824_id[] = {216 { "sy8824", (kernel_ulong_t)&sy8824c_cfg },217 { }218};219MODULE_DEVICE_TABLE(i2c, sy8824_id);220 221static 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};230module_i2c_driver(sy8824_regulator_driver);231 232MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");233MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");234MODULE_LICENSE("GPL v2");235