diff options
Diffstat (limited to 'drivers/regulator/fp9931.c')
| -rw-r--r-- | drivers/regulator/fp9931.c | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/drivers/regulator/fp9931.c b/drivers/regulator/fp9931.c new file mode 100644 index 000000000000..fef0bb07fd5d --- /dev/null +++ b/drivers/regulator/fp9931.c @@ -0,0 +1,551 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright (C) 2025 Andreas Kemnade + +/* Datasheet: https://www.fitipower.com/dl/file/flXa6hIchVeu0W3K */ + +#include <linux/cleanup.h> +#include <linux/completion.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/hwmon.h> +#include <linux/pm_runtime.h> +#include <linux/property.h> +#include <linux/regulator/consumer.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regmap.h> + +#define FP9931_REG_TMST_VALUE 0 +#define FP9931_REG_VCOM_SETTING 1 +#define FP9931_REG_VPOSNEG_SETTING 2 +#define FP9931_REG_PWRON_DELAY 3 +#define FP9931_REG_CONTROL_REG1 11 + +#define PGOOD_TIMEOUT_MSECS 200 + +struct fp9931_data { + struct device *dev; + struct regmap *regmap; + struct regulator *vin_reg; + struct gpio_desc *pgood_gpio; + struct gpio_desc *en_gpio; + struct gpio_desc *en_ts_gpio; + struct completion pgood_completion; + int pgood_irq; +}; + +static const unsigned int VPOSNEG_table[] = { + 7040000, + 7040000, + 7040000, + 7040000, + 7040000, + 7040000, + 7260000, + 7490000, + 7710000, + 7930000, + 8150000, + 8380000, + 8600000, + 8820000, + 9040000, + 9270000, + 9490000, + 9710000, + 9940000, + 10160000, + 10380000, + 10600000, + 10830000, + 11050000, + 11270000, + 11490000, + 11720000, + 11940000, + 12160000, + 12380000, + 12610000, + 12830000, + 13050000, + 13280000, + 13500000, + 13720000, + 13940000, + 14170000, + 14390000, + 14610000, + 14830000, + 15060000, +}; + +static const struct hwmon_channel_info *fp9931_info[] = { + HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), + HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT), + NULL +}; + +static int setup_timings(struct fp9931_data *data) +{ + u32 tdly[4]; + u8 tdlys = 0; + int i; + int ret; + + ret = device_property_count_u32(data->dev, "fitipower,tdly-ms"); + if (ret == -EINVAL) /* property is optional */ + return 0; + + if (ret < 0) + return ret; + + if (ret != ARRAY_SIZE(tdly)) { + dev_err(data->dev, "invalid delay specification"); + return -EINVAL; + } + + ret = device_property_read_u32_array(data->dev, "fitipower,tdly-ms", + tdly, ARRAY_SIZE(tdly)); + if (ret) + return ret; + + for (i = ARRAY_SIZE(tdly) - 1; i >= 0; i--) { + if (tdly[i] > 4 || tdly[i] == 3) + return -EINVAL; + + if (tdly[i] == 4) /* convert from ms */ + tdly[i] = 3; + + tdlys <<= 2; + tdlys |= tdly[i]; + } + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return ret; + + ret = regmap_write(data->regmap, FP9931_REG_PWRON_DELAY, tdlys); + pm_runtime_put_autosuspend(data->dev); + + return ret; +} + +static int fp9931_hwmon_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *temp) +{ + struct fp9931_data *data = dev_get_drvdata(dev); + unsigned int val; + int ret; + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, FP9931_REG_TMST_VALUE, &val); + if (ret) + return ret; + + pm_runtime_put_autosuspend(data->dev); + *temp = (s8)val * 1000; + + return 0; +} + +static umode_t fp9931_hwmon_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + return 0444; +} + +static const struct hwmon_ops fp9931_hwmon_ops = { + .is_visible = fp9931_hwmon_is_visible, + .read = fp9931_hwmon_read, +}; + +static const struct hwmon_chip_info fp9931_chip_info = { + .ops = &fp9931_hwmon_ops, + .info = fp9931_info, +}; + +static int fp9931_runtime_suspend(struct device *dev) +{ + int ret = 0; + struct fp9931_data *data = dev_get_drvdata(dev); + + if (data->en_ts_gpio) + gpiod_set_value_cansleep(data->en_ts_gpio, 0); + + if (data->vin_reg) { + ret = regulator_disable(data->vin_reg); + regcache_mark_dirty(data->regmap); + } + + return ret; +} + +static int fp9931_runtime_resume(struct device *dev) +{ + int ret = 0; + struct fp9931_data *data = dev_get_drvdata(dev); + + if (data->vin_reg) + ret = regulator_enable(data->vin_reg); + + if (ret) + return ret; + + if (data->en_ts_gpio) { + gpiod_set_value_cansleep(data->en_ts_gpio, 1); + /* wait for one ADC conversion to have sane temperature */ + usleep_range(10000, 15000); + } + + ret = regcache_sync(data->regmap); + + return ret; +} + +static bool fp9931_volatile_reg(struct device *dev, unsigned int reg) +{ + return reg == FP9931_REG_TMST_VALUE; +} + +static const struct reg_default fp9931_reg_default = { + .reg = FP9931_REG_VCOM_SETTING, + .def = 0x80, +}; + +static const struct regmap_config regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 12, + .cache_type = REGCACHE_FLAT, + .volatile_reg = fp9931_volatile_reg, + .reg_defaults = &fp9931_reg_default, + .num_reg_defaults = 1, +}; + +static void disable_nopm(void *d) +{ + struct fp9931_data *data = d; + + fp9931_runtime_suspend(data->dev); +} + +static int fp9931_v3p3_enable(struct regulator_dev *rdev) +{ + struct fp9931_data *data = rdev_get_drvdata(rdev); + int ret; + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return ret; + + ret = regulator_enable_regmap(rdev); + if (ret < 0) + pm_runtime_put_autosuspend(data->dev); + + return ret; +} + +static int fp9931_v3p3_disable(struct regulator_dev *rdev) +{ + struct fp9931_data *data = rdev_get_drvdata(rdev); + int ret; + + ret = regulator_disable_regmap(rdev); + pm_runtime_put_autosuspend(data->dev); + + return ret; +} + +static int fp9931_v3p3_is_enabled(struct regulator_dev *rdev) +{ + struct fp9931_data *data = rdev_get_drvdata(rdev); + int ret; + + if (pm_runtime_status_suspended(data->dev)) + return 0; + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return 0; + + ret = regulator_is_enabled_regmap(rdev); + + pm_runtime_put_autosuspend(data->dev); + return ret; +} + +static const struct regulator_ops fp9931_v3p3ops = { + .list_voltage = regulator_list_voltage_linear, + .enable = fp9931_v3p3_enable, + .disable = fp9931_v3p3_disable, + .is_enabled = fp9931_v3p3_is_enabled, +}; + +static int fp9931_check_powergood(struct regulator_dev *rdev) +{ + struct fp9931_data *data = rdev_get_drvdata(rdev); + + if (pm_runtime_status_suspended(data->dev)) + return 0; + + return gpiod_get_value_cansleep(data->pgood_gpio); +} + +static int fp9931_get_voltage_sel(struct regulator_dev *rdev) +{ + struct fp9931_data *data = rdev_get_drvdata(rdev); + int ret; + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return ret; + + ret = regulator_get_voltage_sel_regmap(rdev); + pm_runtime_put_autosuspend(data->dev); + + return ret; +} + +static int fp9931_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector) +{ + struct fp9931_data *data = rdev_get_drvdata(rdev); + int ret; + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return ret; + + ret = regulator_set_voltage_sel_regmap(rdev, selector); + pm_runtime_put_autosuspend(data->dev); + + return ret; +} + +static irqreturn_t pgood_handler(int irq, void *dev_id) +{ + struct fp9931_data *data = dev_id; + + complete(&data->pgood_completion); + + return IRQ_HANDLED; +} + +static int fp9931_set_enable(struct regulator_dev *rdev) +{ + struct fp9931_data *data = rdev_get_drvdata(rdev); + int ret; + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return ret; + + reinit_completion(&data->pgood_completion); + gpiod_set_value_cansleep(data->en_gpio, 1); + dev_dbg(data->dev, "turning on..."); + wait_for_completion_timeout(&data->pgood_completion, + msecs_to_jiffies(PGOOD_TIMEOUT_MSECS)); + dev_dbg(data->dev, "turned on"); + if (gpiod_get_value_cansleep(data->pgood_gpio) != 1) { + pm_runtime_put_autosuspend(data->dev); + return -ETIMEDOUT; + } + + return 0; +} + +static int fp9931_clear_enable(struct regulator_dev *rdev) +{ + struct fp9931_data *data = rdev_get_drvdata(rdev); + + gpiod_set_value_cansleep(data->en_gpio, 0); + pm_runtime_put_autosuspend(data->dev); + return 0; +} + +static const struct regulator_ops fp9931_vcom_ops = { + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, + .enable = fp9931_set_enable, + .disable = fp9931_clear_enable, + .is_enabled = fp9931_check_powergood, + .set_voltage_sel = fp9931_set_voltage_sel, + .get_voltage_sel = fp9931_get_voltage_sel, +}; + +static const struct regulator_ops fp9931_vposneg_ops = { + .list_voltage = regulator_list_voltage_table, + .map_voltage = regulator_map_voltage_ascend, + /* gets enabled by enabling vcom, too */ + .is_enabled = fp9931_check_powergood, + .set_voltage_sel = fp9931_set_voltage_sel, + .get_voltage_sel = fp9931_get_voltage_sel, +}; + +static const struct regulator_desc regulators[] = { + { + .name = "v3p3", + .of_match = of_match_ptr("v3p3"), + .id = 0, + .ops = &fp9931_v3p3ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .enable_reg = FP9931_REG_CONTROL_REG1, + .enable_mask = BIT(1), + .n_voltages = 1, + .min_uV = 3300000 + }, + { + .name = "vposneg", + .of_match = of_match_ptr("vposneg"), + .id = 1, + .ops = &fp9931_vposneg_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .n_voltages = ARRAY_SIZE(VPOSNEG_table), + .vsel_reg = FP9931_REG_VPOSNEG_SETTING, + .vsel_mask = 0x3F, + .volt_table = VPOSNEG_table, + }, + { + .name = "vcom", + .of_match = of_match_ptr("vcom"), + .id = 2, + .ops = &fp9931_vcom_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .n_voltages = 255, + .min_uV = 0, + .uV_step = 5000000 / 255, + .vsel_reg = FP9931_REG_VCOM_SETTING, + .vsel_mask = 0xFF + }, +}; + +static int fp9931_probe(struct i2c_client *client) +{ + struct fp9931_data *data; + struct regulator_config config = { }; + struct regulator_dev *rdev; + int ret = 0; + int i; + + data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); + data->regmap = devm_regmap_init_i2c(client, ®map_config); + if (IS_ERR(data->regmap)) + return dev_err_probe(&client->dev, PTR_ERR(data->regmap), + "failed to allocate regmap!\n"); + + data->vin_reg = devm_regulator_get_optional(&client->dev, "vin"); + if (IS_ERR(data->vin_reg)) + return dev_err_probe(&client->dev, PTR_ERR(data->vin_reg), + "failed to get vin regulator\n"); + + data->pgood_gpio = devm_gpiod_get(&client->dev, "pg", GPIOD_IN); + if (IS_ERR(data->pgood_gpio)) + return dev_err_probe(&client->dev, + PTR_ERR(data->pgood_gpio), + "failed to get power good gpio\n"); + + data->pgood_irq = gpiod_to_irq(data->pgood_gpio); + if (data->pgood_irq < 0) + return data->pgood_irq; + + data->en_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(data->en_gpio)) + return dev_err_probe(&client->dev, PTR_ERR(data->en_gpio), + "failed to get en gpio\n"); + + data->en_ts_gpio = devm_gpiod_get_optional(&client->dev, "en-ts", GPIOD_OUT_LOW); + if (IS_ERR(data->en_ts_gpio)) + return dev_err_probe(&client->dev, + PTR_ERR(data->en_ts_gpio), + "failed to get en gpio\n"); + + data->dev = &client->dev; + i2c_set_clientdata(client, data); + + init_completion(&data->pgood_completion); + + ret = devm_request_threaded_irq(&client->dev, data->pgood_irq, NULL, + pgood_handler, + IRQF_TRIGGER_RISING | IRQF_ONESHOT, + "PGOOD", data); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to request irq\n"); + + if (IS_ENABLED(CONFIG_PM)) { + devm_pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, 4000); + pm_runtime_use_autosuspend(&client->dev); + } else { + ret = fp9931_runtime_resume(&client->dev); + if (ret < 0) + return ret; + + devm_add_action_or_reset(&client->dev, disable_nopm, data); + } + + ret = setup_timings(data); + if (ret) + return dev_err_probe(&client->dev, ret, "failed to setup timings\n"); + + config.driver_data = data; + config.dev = &client->dev; + config.regmap = data->regmap; + + for (i = 0; i < ARRAY_SIZE(regulators); i++) { + rdev = devm_regulator_register(&client->dev, ®ulators[i], + &config); + if (IS_ERR(rdev)) + return dev_err_probe(&client->dev, PTR_ERR(rdev), + "failed to register %s regulator\n", + regulators[i].name); + } + + if (IS_REACHABLE(CONFIG_HWMON)) { + struct device *hwmon_dev; + + hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, "fp9931", data, + &fp9931_chip_info, NULL); + if (IS_ERR(hwmon_dev)) + dev_notice(&client->dev, "failed to register hwmon\n"); + } + + return 0; +} + +static const struct dev_pm_ops fp9931_pm_ops = { + SET_RUNTIME_PM_OPS(fp9931_runtime_suspend, fp9931_runtime_resume, NULL) +}; + +static const struct of_device_id fp9931_dt_ids[] = { + { + .compatible = "fitipower,fp9931", + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, fp9931_dt_ids); + +static struct i2c_driver fp9931_i2c_driver = { + .driver = { + .name = "fp9931", + .of_match_table = fp9931_dt_ids, + .pm = &fp9931_pm_ops, + }, + .probe = fp9931_probe, +}; + +module_i2c_driver(fp9931_i2c_driver); + +/* Module information */ +MODULE_DESCRIPTION("FP9931 regulator driver"); +MODULE_LICENSE("GPL"); + |