diff options
Diffstat (limited to 'drivers/regulator/rt4801-regulator.c')
| -rw-r--r-- | drivers/regulator/rt4801-regulator.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/drivers/regulator/rt4801-regulator.c b/drivers/regulator/rt4801-regulator.c new file mode 100644 index 000000000..7a87788d3 --- /dev/null +++ b/drivers/regulator/rt4801-regulator.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> + +#define RT4801_REG_VOP 0x00 +#define RT4801_REG_VON 0x01 +#define RT4801_REG_APPS 0x03 + +#define VOUT_MASK 0x1F + +#define MIN_UV 4000000 +#define STEP_UV 100000 +#define MAX_UV 6000000 +#define N_VOLTAGES ((MAX_UV - MIN_UV) / STEP_UV + 1) + +#define DSV_OUT_POS 0 +#define DSV_OUT_NEG 1 +#define DSV_OUT_MAX 2 + +#define DSVP_ENABLE BIT(0) +#define DSVN_ENABLE BIT(1) +#define DSVALL_ENABLE (DSVP_ENABLE | DSVN_ENABLE) + +struct rt4801_priv { + struct device *dev; + struct gpio_descs *enable_gpios; + unsigned int enable_flag; + unsigned int volt_sel[DSV_OUT_MAX]; +}; + +static int rt4801_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector) +{ + struct rt4801_priv *priv = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev), ret; + + if (priv->enable_flag & BIT(id)) { + ret = regulator_set_voltage_sel_regmap(rdev, selector); + if (ret) + return ret; + } + + priv->volt_sel[id] = selector; + return 0; +} + +static int rt4801_get_voltage_sel(struct regulator_dev *rdev) +{ + struct rt4801_priv *priv = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + + if (priv->enable_flag & BIT(id)) + return regulator_get_voltage_sel_regmap(rdev); + + return priv->volt_sel[id]; +} + +static int rt4801_enable(struct regulator_dev *rdev) +{ + struct rt4801_priv *priv = rdev_get_drvdata(rdev); + struct gpio_descs *gpios = priv->enable_gpios; + int id = rdev_get_id(rdev), ret; + + if (!gpios || gpios->ndescs <= id) { + dev_warn(&rdev->dev, "no dedicated gpio can control\n"); + goto bypass_gpio; + } + + gpiod_set_value(gpios->desc[id], 1); + +bypass_gpio: + ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, priv->volt_sel[id]); + if (ret) + return ret; + + priv->enable_flag |= BIT(id); + return 0; +} + +static int rt4801_disable(struct regulator_dev *rdev) +{ + struct rt4801_priv *priv = rdev_get_drvdata(rdev); + struct gpio_descs *gpios = priv->enable_gpios; + int id = rdev_get_id(rdev); + + if (!gpios || gpios->ndescs <= id) { + dev_warn(&rdev->dev, "no dedicated gpio can control\n"); + goto bypass_gpio; + } + + gpiod_set_value(gpios->desc[id], 0); + +bypass_gpio: + priv->enable_flag &= ~BIT(id); + return 0; +} + +static int rt4801_is_enabled(struct regulator_dev *rdev) +{ + struct rt4801_priv *priv = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + + return !!(priv->enable_flag & BIT(id)); +} + +static const struct regulator_ops rt4801_regulator_ops = { + .list_voltage = regulator_list_voltage_linear, + .set_voltage_sel = rt4801_set_voltage_sel, + .get_voltage_sel = rt4801_get_voltage_sel, + .enable = rt4801_enable, + .disable = rt4801_disable, + .is_enabled = rt4801_is_enabled, +}; + +static const struct regulator_desc rt4801_regulator_descs[] = { + { + .name = "DSVP", + .ops = &rt4801_regulator_ops, + .of_match = of_match_ptr("DSVP"), + .type = REGULATOR_VOLTAGE, + .id = DSV_OUT_POS, + .min_uV = MIN_UV, + .uV_step = STEP_UV, + .n_voltages = N_VOLTAGES, + .owner = THIS_MODULE, + .vsel_reg = RT4801_REG_VOP, + .vsel_mask = VOUT_MASK, + }, + { + .name = "DSVN", + .ops = &rt4801_regulator_ops, + .of_match = of_match_ptr("DSVN"), + .type = REGULATOR_VOLTAGE, + .id = DSV_OUT_NEG, + .min_uV = MIN_UV, + .uV_step = STEP_UV, + .n_voltages = N_VOLTAGES, + .owner = THIS_MODULE, + .vsel_reg = RT4801_REG_VON, + .vsel_mask = VOUT_MASK, + }, +}; + +static const struct regmap_config rt4801_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT4801_REG_APPS, +}; + +static int rt4801_probe(struct i2c_client *i2c) +{ + struct rt4801_priv *priv; + struct regmap *regmap; + int i; + + priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &i2c->dev; + /* bootloader will on, driver only reconfigure enable to all output high */ + priv->enable_flag = DSVALL_ENABLE; + + regmap = devm_regmap_init_i2c(i2c, &rt4801_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&i2c->dev, "Failed to init regmap\n"); + return PTR_ERR(regmap); + } + + priv->enable_gpios = devm_gpiod_get_array_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(priv->enable_gpios)) { + dev_err(&i2c->dev, "Failed to get gpios\n"); + return PTR_ERR(priv->enable_gpios); + } + + for (i = 0; i < DSV_OUT_MAX; i++) { + const struct regulator_desc *desc = rt4801_regulator_descs + i; + struct regulator_config config = { .dev = &i2c->dev, .driver_data = priv, + .regmap = regmap, }; + struct regulator_dev *rdev; + unsigned int val; + int ret; + + /* initialize volt_sel variable */ + ret = regmap_read(regmap, desc->vsel_reg, &val); + if (ret) + return ret; + + priv->volt_sel[i] = val & desc->vsel_mask; + + rdev = devm_regulator_register(&i2c->dev, desc, &config); + if (IS_ERR(rdev)) { + dev_err(&i2c->dev, "Failed to register [%d] regulator\n", i); + return PTR_ERR(rdev); + } + } + + return 0; +} + +static const struct of_device_id __maybe_unused rt4801_of_id[] = { + { .compatible = "richtek,rt4801", }, + { }, +}; +MODULE_DEVICE_TABLE(of, rt4801_of_id); + +static struct i2c_driver rt4801_driver = { + .driver = { + .name = "rt4801", + .of_match_table = of_match_ptr(rt4801_of_id), + }, + .probe_new = rt4801_probe, +}; +module_i2c_driver(rt4801_driver); + +MODULE_AUTHOR("ChiYuan Hwang <cy_huang@richtek.com>"); +MODULE_DESCRIPTION("Richtek RT4801 Display Bias Driver"); +MODULE_LICENSE("GPL v2"); |