diff options
Diffstat (limited to 'drivers/regulator/aw37503-regulator.c')
| -rw-r--r-- | drivers/regulator/aw37503-regulator.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/drivers/regulator/aw37503-regulator.c b/drivers/regulator/aw37503-regulator.c new file mode 100644 index 0000000000..a5ff6dfd29 --- /dev/null +++ b/drivers/regulator/aw37503-regulator.c @@ -0,0 +1,240 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// AWINIC AW37503 Regulator Driver +// +// Copyright (C) 2023 awinic. All Rights Reserved +// +// Author: <like@awinic.com> + +#include <linux/err.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> + +#define AW37503_REG_VPOS 0x00 +#define AW37503_REG_VNEG 0x01 +#define AW37503_REG_APPS 0x03 +#define AW37503_REG_CONTROL 0x04 +#define AW37503_REG_WPRTEN 0x21 + +#define AW37503_VOUT_MASK 0x1F +#define AW37503_VOUT_N_VOLTAGE 0x15 +#define AW37503_VOUT_VMIN 4000000 +#define AW37503_VOUT_VMAX 6000000 +#define AW37503_VOUT_STEP 100000 + +#define AW37503_REG_APPS_DIS_VPOS BIT(1) +#define AW37503_REG_APPS_DIS_VNEG BIT(0) + +#define AW37503_REGULATOR_ID_VPOS 0 +#define AW37503_REGULATOR_ID_VNEG 1 +#define AW37503_MAX_REGULATORS 2 + +struct aw37503_reg_pdata { + struct gpio_desc *en_gpiod; + int ena_gpio_state; +}; + +struct aw37503_regulator { + struct device *dev; + struct aw37503_reg_pdata reg_pdata[AW37503_MAX_REGULATORS]; +}; + +static int aw37503_regulator_enable(struct regulator_dev *rdev) +{ + struct aw37503_regulator *chip = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id]; + int ret; + + if (!IS_ERR(rpdata->en_gpiod)) { + gpiod_set_value_cansleep(rpdata->en_gpiod, 1); + rpdata->ena_gpio_state = 1; + } + + /* Hardware automatically enable discharge bit in enable */ + if (rdev->constraints->active_discharge == + REGULATOR_ACTIVE_DISCHARGE_DISABLE) { + ret = regulator_set_active_discharge_regmap(rdev, false); + if (ret < 0) { + dev_err(chip->dev, "Failed to disable active discharge: %d\n", + ret); + return ret; + } + } + + return 0; +} + +static int aw37503_regulator_disable(struct regulator_dev *rdev) +{ + struct aw37503_regulator *chip = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id]; + + if (!IS_ERR(rpdata->en_gpiod)) { + gpiod_set_value_cansleep(rpdata->en_gpiod, 0); + rpdata->ena_gpio_state = 0; + } + + return 0; +} + +static int aw37503_regulator_is_enabled(struct regulator_dev *rdev) +{ + struct aw37503_regulator *chip = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id]; + + if (!IS_ERR(rpdata->en_gpiod)) + return rpdata->ena_gpio_state; + + return 1; +} + +static const struct regulator_ops aw37503_regulator_ops = { + .enable = aw37503_regulator_enable, + .disable = aw37503_regulator_disable, + .is_enabled = aw37503_regulator_is_enabled, + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .set_active_discharge = regulator_set_active_discharge_regmap, +}; + +static int aw37503_of_parse_cb(struct device_node *np, + const struct regulator_desc *desc, + struct regulator_config *config) +{ + struct aw37503_regulator *chip = config->driver_data; + struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[desc->id]; + int ret; + + rpdata->en_gpiod = devm_fwnode_gpiod_get(chip->dev, of_fwnode_handle(np), + "enable", GPIOD_OUT_LOW, + "enable"); + + if (IS_ERR(rpdata->en_gpiod)) { + ret = PTR_ERR(rpdata->en_gpiod); + + /* Ignore the error other than probe defer */ + if (ret == -EPROBE_DEFER) + return ret; + return 0; + } + + return 0; +} + +#define AW37503_REGULATOR_DESC(_id, _name) \ + [AW37503_REGULATOR_ID_##_id] = { \ + .name = "aw37503-"#_name, \ + .supply_name = "vin", \ + .id = AW37503_REGULATOR_ID_##_id, \ + .of_match = of_match_ptr(#_name), \ + .of_parse_cb = aw37503_of_parse_cb, \ + .ops = &aw37503_regulator_ops, \ + .n_voltages = AW37503_VOUT_N_VOLTAGE, \ + .min_uV = AW37503_VOUT_VMIN, \ + .uV_step = AW37503_VOUT_STEP, \ + .enable_time = 500, \ + .vsel_mask = AW37503_VOUT_MASK, \ + .vsel_reg = AW37503_REG_##_id, \ + .active_discharge_off = 0, \ + .active_discharge_on = AW37503_REG_APPS_DIS_##_id, \ + .active_discharge_mask = AW37503_REG_APPS_DIS_##_id, \ + .active_discharge_reg = AW37503_REG_APPS, \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ + } + +static const struct regulator_desc aw_regs_desc[AW37503_MAX_REGULATORS] = { + AW37503_REGULATOR_DESC(VPOS, outp), + AW37503_REGULATOR_DESC(VNEG, outn), +}; + +static const struct regmap_range aw37503_no_reg_ranges[] = { + regmap_reg_range(AW37503_REG_CONTROL + 1, + AW37503_REG_WPRTEN - 1), +}; + +static const struct regmap_access_table aw37503_no_reg_table = { + .no_ranges = aw37503_no_reg_ranges, + .n_no_ranges = ARRAY_SIZE(aw37503_no_reg_ranges), +}; + +static const struct regmap_config aw37503_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = AW37503_REG_WPRTEN, + .rd_table = &aw37503_no_reg_table, + .wr_table = &aw37503_no_reg_table, +}; + +static int aw37503_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct aw37503_regulator *chip; + struct regulator_dev *rdev; + struct regmap *regmap; + struct regulator_config config = { }; + int id; + + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(client, &aw37503_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), + "Failed to init regmap\n"); + + i2c_set_clientdata(client, chip); + chip->dev = dev; + + config.regmap = regmap; + config.dev = dev; + config.driver_data = chip; + + for (id = 0; id < AW37503_MAX_REGULATORS; ++id) { + rdev = devm_regulator_register(dev, &aw_regs_desc[id], + &config); + if (IS_ERR(rdev)) + return dev_err_probe(dev, PTR_ERR(rdev), + "Failed to register regulator %s\n", + aw_regs_desc[id].name); + } + return 0; +} + +static const struct i2c_device_id aw37503_id[] = { + {.name = "aw37503",}, + {}, +}; +MODULE_DEVICE_TABLE(i2c, aw37503_id); + +static const struct of_device_id aw37503_of_match[] = { + {.compatible = "awinic,aw37503",}, + { /* Sentinel */ }, +}; + +MODULE_DEVICE_TABLE(of, aw37503_of_match); + +static struct i2c_driver aw37503_i2c_driver = { + .driver = { + .name = "aw37503", + .of_match_table = aw37503_of_match, + }, + .probe = aw37503_probe, + .id_table = aw37503_id, +}; + +module_i2c_driver(aw37503_i2c_driver); + +MODULE_DESCRIPTION("aw37503 regulator driver"); +MODULE_AUTHOR("Alec Li <like@awinic.com>"); +MODULE_LICENSE("GPL"); |