diff options
Diffstat (limited to 'drivers/regulator/sy8827n.c')
| -rw-r--r-- | drivers/regulator/sy8827n.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/regulator/sy8827n.c b/drivers/regulator/sy8827n.c new file mode 100644 index 0000000000..f11ff38b36 --- /dev/null +++ b/drivers/regulator/sy8827n.c @@ -0,0 +1,200 @@ +// 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.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_ID1 3 +#define SY8827N_ID2 4 +#define SY8827N_PGOOD 5 +#define SY8827N_MAX (SY8827N_PGOOD + 1) + +#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 bool sy8827n_volatile_reg(struct device *dev, unsigned int reg) +{ + if (reg == SY8827N_PGOOD) + return true; + return false; +} + +static const struct regmap_config sy8827n_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .volatile_reg = sy8827n_volatile_reg, + .num_reg_defaults_raw = SY8827N_MAX, + .cache_type = REGCACHE_FLAT, +}; + +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", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .of_match_table = sy8827n_dt_ids, + }, + .probe = 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"); |