| // SPDX-License-Identifier: GPL-2.0 |
| // |
| // SY8827N regulator driver |
| // |
| // Copyright (C) 2020 Synaptics Incorporated |
| // |
| // Author: Jisheng Zhang <jszhang@kernel.org> |
| |
| #include <linux/gpio/consumer.h> |
| #include <linux/module.h> |
| #include <linux/i2c.h> |
| #include <linux/of_device.h> |
| #include <linux/regmap.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/of_regulator.h> |
| |
| #define SY8827N_VSEL0 0 |
| #define SY8827N_BUCK_EN (1 << 7) |
| #define SY8827N_MODE (1 << 6) |
| #define SY8827N_VSEL1 1 |
| #define SY8827N_CTRL 2 |
| |
| #define SY8827N_NVOLTAGES 64 |
| #define SY8827N_VSELMIN 600000 |
| #define SY8827N_VSELSTEP 12500 |
| |
| struct sy8827n_device_info { |
| struct device *dev; |
| struct regulator_desc desc; |
| struct regulator_init_data *regulator; |
| struct gpio_desc *en_gpio; |
| unsigned int vsel_reg; |
| }; |
| |
| static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode) |
| { |
| struct sy8827n_device_info *di = rdev_get_drvdata(rdev); |
| |
| switch (mode) { |
| case REGULATOR_MODE_FAST: |
| regmap_update_bits(rdev->regmap, di->vsel_reg, |
| SY8827N_MODE, SY8827N_MODE); |
| break; |
| case REGULATOR_MODE_NORMAL: |
| regmap_update_bits(rdev->regmap, di->vsel_reg, |
| SY8827N_MODE, 0); |
| break; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static unsigned int sy8827n_get_mode(struct regulator_dev *rdev) |
| { |
| struct sy8827n_device_info *di = rdev_get_drvdata(rdev); |
| u32 val; |
| int ret = 0; |
| |
| ret = regmap_read(rdev->regmap, di->vsel_reg, &val); |
| if (ret < 0) |
| return ret; |
| if (val & SY8827N_MODE) |
| return REGULATOR_MODE_FAST; |
| else |
| return REGULATOR_MODE_NORMAL; |
| } |
| |
| static const struct regulator_ops sy8827n_regulator_ops = { |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| .set_voltage_time_sel = regulator_set_voltage_time_sel, |
| .map_voltage = regulator_map_voltage_linear, |
| .list_voltage = regulator_list_voltage_linear, |
| .enable = regulator_enable_regmap, |
| .disable = regulator_disable_regmap, |
| .is_enabled = regulator_is_enabled_regmap, |
| .set_mode = sy8827n_set_mode, |
| .get_mode = sy8827n_get_mode, |
| }; |
| |
| static int sy8827n_regulator_register(struct sy8827n_device_info *di, |
| struct regulator_config *config) |
| { |
| struct regulator_desc *rdesc = &di->desc; |
| struct regulator_dev *rdev; |
| |
| rdesc->name = "sy8827n-reg"; |
| rdesc->supply_name = "vin"; |
| rdesc->ops = &sy8827n_regulator_ops; |
| rdesc->type = REGULATOR_VOLTAGE; |
| rdesc->n_voltages = SY8827N_NVOLTAGES; |
| rdesc->enable_reg = di->vsel_reg; |
| rdesc->enable_mask = SY8827N_BUCK_EN; |
| rdesc->min_uV = SY8827N_VSELMIN; |
| rdesc->uV_step = SY8827N_VSELSTEP; |
| rdesc->vsel_reg = di->vsel_reg; |
| rdesc->vsel_mask = rdesc->n_voltages - 1; |
| rdesc->owner = THIS_MODULE; |
| |
| rdev = devm_regulator_register(di->dev, &di->desc, config); |
| return PTR_ERR_OR_ZERO(rdev); |
| } |
| |
| static const struct regmap_config sy8827n_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| }; |
| |
| static int sy8827n_i2c_probe(struct i2c_client *client) |
| { |
| struct device *dev = &client->dev; |
| struct device_node *np = dev->of_node; |
| struct sy8827n_device_info *di; |
| struct regulator_config config = { }; |
| struct regmap *regmap; |
| int ret; |
| |
| di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL); |
| if (!di) |
| return -ENOMEM; |
| |
| di->regulator = of_get_regulator_init_data(dev, np, &di->desc); |
| if (!di->regulator) { |
| dev_err(dev, "Platform data not found!\n"); |
| return -EINVAL; |
| } |
| |
| di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); |
| if (IS_ERR(di->en_gpio)) |
| return PTR_ERR(di->en_gpio); |
| |
| if (of_property_read_bool(np, "silergy,vsel-state-high")) |
| di->vsel_reg = SY8827N_VSEL1; |
| else |
| di->vsel_reg = SY8827N_VSEL0; |
| |
| di->dev = dev; |
| |
| regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config); |
| if (IS_ERR(regmap)) { |
| dev_err(dev, "Failed to allocate regmap!\n"); |
| return PTR_ERR(regmap); |
| } |
| i2c_set_clientdata(client, di); |
| |
| config.dev = di->dev; |
| config.init_data = di->regulator; |
| config.regmap = regmap; |
| config.driver_data = di; |
| config.of_node = np; |
| |
| ret = sy8827n_regulator_register(di, &config); |
| if (ret < 0) |
| dev_err(dev, "Failed to register regulator!\n"); |
| return ret; |
| } |
| |
| static const struct of_device_id sy8827n_dt_ids[] = { |
| { |
| .compatible = "silergy,sy8827n", |
| }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, sy8827n_dt_ids); |
| |
| static const struct i2c_device_id sy8827n_id[] = { |
| { "sy8827n", }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(i2c, sy8827n_id); |
| |
| static struct i2c_driver sy8827n_regulator_driver = { |
| .driver = { |
| .name = "sy8827n-regulator", |
| .of_match_table = of_match_ptr(sy8827n_dt_ids), |
| }, |
| .probe_new = sy8827n_i2c_probe, |
| .id_table = sy8827n_id, |
| }; |
| module_i2c_driver(sy8827n_regulator_driver); |
| |
| MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>"); |
| MODULE_DESCRIPTION("SY8827N regulator driver"); |
| MODULE_LICENSE("GPL v2"); |