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1// SPDX-License-Identifier: GPL-2.02//3// SY8827N regulator driver4//5// Copyright (C) 2020 Synaptics Incorporated6//7// Author: Jisheng Zhang <jszhang@kernel.org>8 9#include <linux/gpio/consumer.h>10#include <linux/module.h>11#include <linux/i2c.h>12#include <linux/of.h>13#include <linux/regmap.h>14#include <linux/regulator/driver.h>15#include <linux/regulator/of_regulator.h>16 17#define SY8827N_VSEL0 018#define SY8827N_BUCK_EN (1 << 7)19#define SY8827N_MODE (1 << 6)20#define SY8827N_VSEL1 121#define SY8827N_CTRL 222#define SY8827N_ID1 323#define SY8827N_ID2 424#define SY8827N_PGOOD 525#define SY8827N_MAX (SY8827N_PGOOD + 1)26 27#define SY8827N_NVOLTAGES 6428#define SY8827N_VSELMIN 60000029#define SY8827N_VSELSTEP 1250030 31struct sy8827n_device_info {32 struct device *dev;33 struct regulator_desc desc;34 struct regulator_init_data *regulator;35 struct gpio_desc *en_gpio;36 unsigned int vsel_reg;37};38 39static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)40{41 struct sy8827n_device_info *di = rdev_get_drvdata(rdev);42 43 switch (mode) {44 case REGULATOR_MODE_FAST:45 regmap_update_bits(rdev->regmap, di->vsel_reg,46 SY8827N_MODE, SY8827N_MODE);47 break;48 case REGULATOR_MODE_NORMAL:49 regmap_update_bits(rdev->regmap, di->vsel_reg,50 SY8827N_MODE, 0);51 break;52 default:53 return -EINVAL;54 }55 return 0;56}57 58static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)59{60 struct sy8827n_device_info *di = rdev_get_drvdata(rdev);61 u32 val;62 int ret = 0;63 64 ret = regmap_read(rdev->regmap, di->vsel_reg, &val);65 if (ret < 0)66 return ret;67 if (val & SY8827N_MODE)68 return REGULATOR_MODE_FAST;69 else70 return REGULATOR_MODE_NORMAL;71}72 73static const struct regulator_ops sy8827n_regulator_ops = {74 .set_voltage_sel = regulator_set_voltage_sel_regmap,75 .get_voltage_sel = regulator_get_voltage_sel_regmap,76 .set_voltage_time_sel = regulator_set_voltage_time_sel,77 .map_voltage = regulator_map_voltage_linear,78 .list_voltage = regulator_list_voltage_linear,79 .enable = regulator_enable_regmap,80 .disable = regulator_disable_regmap,81 .is_enabled = regulator_is_enabled_regmap,82 .set_mode = sy8827n_set_mode,83 .get_mode = sy8827n_get_mode,84};85 86static int sy8827n_regulator_register(struct sy8827n_device_info *di,87 struct regulator_config *config)88{89 struct regulator_desc *rdesc = &di->desc;90 struct regulator_dev *rdev;91 92 rdesc->name = "sy8827n-reg";93 rdesc->supply_name = "vin";94 rdesc->ops = &sy8827n_regulator_ops;95 rdesc->type = REGULATOR_VOLTAGE;96 rdesc->n_voltages = SY8827N_NVOLTAGES;97 rdesc->enable_reg = di->vsel_reg;98 rdesc->enable_mask = SY8827N_BUCK_EN;99 rdesc->min_uV = SY8827N_VSELMIN;100 rdesc->uV_step = SY8827N_VSELSTEP;101 rdesc->vsel_reg = di->vsel_reg;102 rdesc->vsel_mask = rdesc->n_voltages - 1;103 rdesc->owner = THIS_MODULE;104 105 rdev = devm_regulator_register(di->dev, &di->desc, config);106 return PTR_ERR_OR_ZERO(rdev);107}108 109static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)110{111 if (reg == SY8827N_PGOOD)112 return true;113 return false;114}115 116static const struct regmap_config sy8827n_regmap_config = {117 .reg_bits = 8,118 .val_bits = 8,119 .volatile_reg = sy8827n_volatile_reg,120 .num_reg_defaults_raw = SY8827N_MAX,121 .cache_type = REGCACHE_FLAT,122};123 124static int sy8827n_i2c_probe(struct i2c_client *client)125{126 struct device *dev = &client->dev;127 struct device_node *np = dev->of_node;128 struct sy8827n_device_info *di;129 struct regulator_config config = { };130 struct regmap *regmap;131 int ret;132 133 di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);134 if (!di)135 return -ENOMEM;136 137 di->regulator = of_get_regulator_init_data(dev, np, &di->desc);138 if (!di->regulator) {139 dev_err(dev, "Platform data not found!\n");140 return -EINVAL;141 }142 143 di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);144 if (IS_ERR(di->en_gpio))145 return PTR_ERR(di->en_gpio);146 147 if (of_property_read_bool(np, "silergy,vsel-state-high"))148 di->vsel_reg = SY8827N_VSEL1;149 else150 di->vsel_reg = SY8827N_VSEL0;151 152 di->dev = dev;153 154 regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);155 if (IS_ERR(regmap)) {156 dev_err(dev, "Failed to allocate regmap!\n");157 return PTR_ERR(regmap);158 }159 i2c_set_clientdata(client, di);160 161 config.dev = di->dev;162 config.init_data = di->regulator;163 config.regmap = regmap;164 config.driver_data = di;165 config.of_node = np;166 167 ret = sy8827n_regulator_register(di, &config);168 if (ret < 0)169 dev_err(dev, "Failed to register regulator!\n");170 return ret;171}172 173static const struct of_device_id sy8827n_dt_ids[] = {174 {175 .compatible = "silergy,sy8827n",176 },177 { }178};179MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);180 181static const struct i2c_device_id sy8827n_id[] = {182 { "sy8827n", },183 { },184};185MODULE_DEVICE_TABLE(i2c, sy8827n_id);186 187static struct i2c_driver sy8827n_regulator_driver = {188 .driver = {189 .name = "sy8827n-regulator",190 .probe_type = PROBE_PREFER_ASYNCHRONOUS,191 .of_match_table = sy8827n_dt_ids,192 },193 .probe = sy8827n_i2c_probe,194 .id_table = sy8827n_id,195};196module_i2c_driver(sy8827n_regulator_driver);197 198MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");199MODULE_DESCRIPTION("SY8827N regulator driver");200MODULE_LICENSE("GPL v2");201