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1// SPDX-License-Identifier: GPL-2.0+2 3#include <linux/gpio/consumer.h>4#include <linux/i2c.h>5#include <linux/kernel.h>6#include <linux/module.h>7#include <linux/of.h>8#include <linux/regmap.h>9#include <linux/regulator/driver.h>10 11#define RT4801_REG_VOP 0x0012#define RT4801_REG_VON 0x0113#define RT4801_REG_APPS 0x0314 15#define VOUT_MASK 0x1F16 17#define MIN_UV 400000018#define STEP_UV 10000019#define MAX_UV 600000020#define N_VOLTAGES ((MAX_UV - MIN_UV) / STEP_UV + 1)21 22#define DSV_OUT_POS 023#define DSV_OUT_NEG 124#define DSV_OUT_MAX 225 26#define DSVP_ENABLE BIT(0)27#define DSVN_ENABLE BIT(1)28#define DSVALL_ENABLE (DSVP_ENABLE | DSVN_ENABLE)29 30struct rt4801_priv {31 struct device *dev;32 struct gpio_desc *enable_gpios[DSV_OUT_MAX];33 unsigned int enable_flag;34 unsigned int volt_sel[DSV_OUT_MAX];35};36 37static int rt4801_of_parse_cb(struct device_node *np,38 const struct regulator_desc *desc,39 struct regulator_config *config)40{41 struct rt4801_priv *priv = config->driver_data;42 int id = desc->id;43 44 if (priv->enable_gpios[id]) {45 dev_warn(priv->dev, "duplicated enable-gpios property\n");46 return 0;47 }48 priv->enable_gpios[id] = devm_fwnode_gpiod_get_index(priv->dev,49 of_fwnode_handle(np),50 "enable", 0,51 GPIOD_OUT_HIGH,52 "rt4801");53 if (IS_ERR(priv->enable_gpios[id]))54 priv->enable_gpios[id] = NULL;55 56 return 0;57}58 59static int rt4801_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector)60{61 struct rt4801_priv *priv = rdev_get_drvdata(rdev);62 int id = rdev_get_id(rdev), ret;63 64 if (priv->enable_flag & BIT(id)) {65 ret = regulator_set_voltage_sel_regmap(rdev, selector);66 if (ret)67 return ret;68 }69 70 priv->volt_sel[id] = selector;71 return 0;72}73 74static int rt4801_get_voltage_sel(struct regulator_dev *rdev)75{76 struct rt4801_priv *priv = rdev_get_drvdata(rdev);77 int id = rdev_get_id(rdev);78 79 if (priv->enable_flag & BIT(id))80 return regulator_get_voltage_sel_regmap(rdev);81 82 return priv->volt_sel[id];83}84 85static int rt4801_enable(struct regulator_dev *rdev)86{87 struct rt4801_priv *priv = rdev_get_drvdata(rdev);88 int id = rdev_get_id(rdev), ret;89 90 if (!priv->enable_gpios[id]) {91 dev_warn(&rdev->dev, "no dedicated gpio can control\n");92 goto bypass_gpio;93 }94 95 gpiod_set_value(priv->enable_gpios[id], 1);96 97bypass_gpio:98 ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, priv->volt_sel[id]);99 if (ret)100 return ret;101 102 priv->enable_flag |= BIT(id);103 return 0;104}105 106static int rt4801_disable(struct regulator_dev *rdev)107{108 struct rt4801_priv *priv = rdev_get_drvdata(rdev);109 int id = rdev_get_id(rdev);110 111 if (!priv->enable_gpios[id]) {112 dev_warn(&rdev->dev, "no dedicated gpio can control\n");113 goto bypass_gpio;114 }115 116 gpiod_set_value(priv->enable_gpios[id], 0);117 118bypass_gpio:119 priv->enable_flag &= ~BIT(id);120 return 0;121}122 123static int rt4801_is_enabled(struct regulator_dev *rdev)124{125 struct rt4801_priv *priv = rdev_get_drvdata(rdev);126 int id = rdev_get_id(rdev);127 128 return !!(priv->enable_flag & BIT(id));129}130 131static const struct regulator_ops rt4801_regulator_ops = {132 .list_voltage = regulator_list_voltage_linear,133 .set_voltage_sel = rt4801_set_voltage_sel,134 .get_voltage_sel = rt4801_get_voltage_sel,135 .enable = rt4801_enable,136 .disable = rt4801_disable,137 .is_enabled = rt4801_is_enabled,138};139 140static const struct regulator_desc rt4801_regulator_descs[] = {141 {142 .name = "DSVP",143 .ops = &rt4801_regulator_ops,144 .of_match = of_match_ptr("DSVP"),145 .of_parse_cb = rt4801_of_parse_cb,146 .type = REGULATOR_VOLTAGE,147 .id = DSV_OUT_POS,148 .min_uV = MIN_UV,149 .uV_step = STEP_UV,150 .n_voltages = N_VOLTAGES,151 .owner = THIS_MODULE,152 .vsel_reg = RT4801_REG_VOP,153 .vsel_mask = VOUT_MASK,154 },155 {156 .name = "DSVN",157 .ops = &rt4801_regulator_ops,158 .of_match = of_match_ptr("DSVN"),159 .of_parse_cb = rt4801_of_parse_cb,160 .type = REGULATOR_VOLTAGE,161 .id = DSV_OUT_NEG,162 .min_uV = MIN_UV,163 .uV_step = STEP_UV,164 .n_voltages = N_VOLTAGES,165 .owner = THIS_MODULE,166 .vsel_reg = RT4801_REG_VON,167 .vsel_mask = VOUT_MASK,168 },169};170 171static const struct regmap_config rt4801_regmap_config = {172 .reg_bits = 8,173 .val_bits = 8,174 .max_register = RT4801_REG_APPS,175};176 177static int rt4801_probe(struct i2c_client *i2c)178{179 struct rt4801_priv *priv;180 struct regmap *regmap;181 int i;182 183 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);184 if (!priv)185 return -ENOMEM;186 187 priv->dev = &i2c->dev;188 /* bootloader will on, driver only reconfigure enable to all output high */189 priv->enable_flag = DSVALL_ENABLE;190 191 regmap = devm_regmap_init_i2c(i2c, &rt4801_regmap_config);192 if (IS_ERR(regmap)) {193 dev_err(&i2c->dev, "Failed to init regmap\n");194 return PTR_ERR(regmap);195 }196 197 for (i = 0; i < DSV_OUT_MAX; i++) {198 priv->enable_gpios[i] = devm_gpiod_get_index_optional(&i2c->dev,199 "enable",200 i,201 GPIOD_OUT_HIGH);202 if (IS_ERR(priv->enable_gpios[i])) {203 dev_err(&i2c->dev, "Failed to get gpios\n");204 return PTR_ERR(priv->enable_gpios[i]);205 }206 }207 208 for (i = 0; i < DSV_OUT_MAX; i++) {209 const struct regulator_desc *desc = rt4801_regulator_descs + i;210 struct regulator_config config = { .dev = &i2c->dev, .driver_data = priv,211 .regmap = regmap, };212 struct regulator_dev *rdev;213 unsigned int val;214 int ret;215 216 /* initialize volt_sel variable */217 ret = regmap_read(regmap, desc->vsel_reg, &val);218 if (ret)219 return ret;220 221 priv->volt_sel[i] = val & desc->vsel_mask;222 223 rdev = devm_regulator_register(&i2c->dev, desc, &config);224 if (IS_ERR(rdev)) {225 dev_err(&i2c->dev, "Failed to register [%d] regulator\n", i);226 return PTR_ERR(rdev);227 }228 }229 230 return 0;231}232 233static const struct of_device_id __maybe_unused rt4801_of_id[] = {234 { .compatible = "richtek,rt4801", },235 { },236};237MODULE_DEVICE_TABLE(of, rt4801_of_id);238 239static struct i2c_driver rt4801_driver = {240 .driver = {241 .name = "rt4801",242 .probe_type = PROBE_PREFER_ASYNCHRONOUS,243 .of_match_table = of_match_ptr(rt4801_of_id),244 },245 .probe = rt4801_probe,246};247module_i2c_driver(rt4801_driver);248 249MODULE_AUTHOR("ChiYuan Hwang <cy_huang@richtek.com>");250MODULE_DESCRIPTION("Richtek RT4801 Display Bias Driver");251MODULE_LICENSE("GPL v2");252