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Diffstat (limited to '')
| -rw-r--r-- | drivers/power/supply/axp20x_ac_power.c | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/drivers/power/supply/axp20x_ac_power.c b/drivers/power/supply/axp20x_ac_power.c new file mode 100644 index 000000000..57e50208d --- /dev/null +++ b/drivers/power/supply/axp20x_ac_power.c @@ -0,0 +1,424 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * AXP20X and AXP22X PMICs' ACIN power supply driver + * + * Copyright (C) 2016 Free Electrons + * Quentin Schulz <quentin.schulz@free-electrons.com> + */ + +#include <linux/device.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/mfd/axp20x.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/power_supply.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/iio/consumer.h> + +#define AXP20X_PWR_STATUS_ACIN_PRESENT BIT(7) +#define AXP20X_PWR_STATUS_ACIN_AVAIL BIT(6) + +#define AXP813_ACIN_PATH_SEL BIT(7) +#define AXP813_ACIN_PATH_SEL_TO_BIT(x) (!!(x) << 7) + +#define AXP813_VHOLD_MASK GENMASK(5, 3) +#define AXP813_VHOLD_UV_TO_BIT(x) ((((x) / 100000) - 40) << 3) +#define AXP813_VHOLD_REG_TO_UV(x) \ + (((((x) & AXP813_VHOLD_MASK) >> 3) + 40) * 100000) + +#define AXP813_CURR_LIMIT_MASK GENMASK(2, 0) +#define AXP813_CURR_LIMIT_UA_TO_BIT(x) (((x) / 500000) - 3) +#define AXP813_CURR_LIMIT_REG_TO_UA(x) \ + ((((x) & AXP813_CURR_LIMIT_MASK) + 3) * 500000) + +#define DRVNAME "axp20x-ac-power-supply" + +struct axp20x_ac_power { + struct regmap *regmap; + struct power_supply *supply; + struct iio_channel *acin_v; + struct iio_channel *acin_i; + bool has_acin_path_sel; + unsigned int num_irqs; + unsigned int irqs[]; +}; + +static irqreturn_t axp20x_ac_power_irq(int irq, void *devid) +{ + struct axp20x_ac_power *power = devid; + + power_supply_changed(power->supply); + + return IRQ_HANDLED; +} + +static int axp20x_ac_power_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct axp20x_ac_power *power = power_supply_get_drvdata(psy); + int ret, reg; + + switch (psp) { + case POWER_SUPPLY_PROP_HEALTH: + ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, ®); + if (ret) + return ret; + + if (reg & AXP20X_PWR_STATUS_ACIN_PRESENT) { + val->intval = POWER_SUPPLY_HEALTH_GOOD; + return 0; + } + + val->intval = POWER_SUPPLY_HEALTH_UNKNOWN; + return 0; + + case POWER_SUPPLY_PROP_PRESENT: + ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, ®); + if (ret) + return ret; + + val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_PRESENT); + return 0; + + case POWER_SUPPLY_PROP_ONLINE: + ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, ®); + if (ret) + return ret; + + val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_AVAIL); + + /* ACIN_PATH_SEL disables ACIN even if ACIN_AVAIL is set. */ + if (val->intval && power->has_acin_path_sel) { + ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, + ®); + if (ret) + return ret; + + val->intval = !!(reg & AXP813_ACIN_PATH_SEL); + } + + return 0; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = iio_read_channel_processed(power->acin_v, &val->intval); + if (ret) + return ret; + + /* IIO framework gives mV but Power Supply framework gives uV */ + val->intval *= 1000; + + return 0; + + case POWER_SUPPLY_PROP_CURRENT_NOW: + ret = iio_read_channel_processed(power->acin_i, &val->intval); + if (ret) + return ret; + + /* IIO framework gives mA but Power Supply framework gives uA */ + val->intval *= 1000; + + return 0; + + case POWER_SUPPLY_PROP_VOLTAGE_MIN: + ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, ®); + if (ret) + return ret; + + val->intval = AXP813_VHOLD_REG_TO_UV(reg); + + return 0; + + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, ®); + if (ret) + return ret; + + val->intval = AXP813_CURR_LIMIT_REG_TO_UA(reg); + /* AXP813 datasheet defines values 11x as 4000mA */ + if (val->intval > 4000000) + val->intval = 4000000; + + return 0; + + default: + return -EINVAL; + } + + return -EINVAL; +} + +static int axp813_ac_power_set_property(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct axp20x_ac_power *power = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL, + AXP813_ACIN_PATH_SEL, + AXP813_ACIN_PATH_SEL_TO_BIT(val->intval)); + + case POWER_SUPPLY_PROP_VOLTAGE_MIN: + if (val->intval < 4000000 || val->intval > 4700000) + return -EINVAL; + + return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL, + AXP813_VHOLD_MASK, + AXP813_VHOLD_UV_TO_BIT(val->intval)); + + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + if (val->intval < 1500000 || val->intval > 4000000) + return -EINVAL; + + return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL, + AXP813_CURR_LIMIT_MASK, + AXP813_CURR_LIMIT_UA_TO_BIT(val->intval)); + + default: + return -EINVAL; + } + + return -EINVAL; +} + +static int axp813_ac_power_prop_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + return psp == POWER_SUPPLY_PROP_ONLINE || + psp == POWER_SUPPLY_PROP_VOLTAGE_MIN || + psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT; +} + +static enum power_supply_property axp20x_ac_power_properties[] = { + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, +}; + +static enum power_supply_property axp22x_ac_power_properties[] = { + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_ONLINE, +}; + +static enum power_supply_property axp813_ac_power_properties[] = { + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_VOLTAGE_MIN, + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, +}; + +static const struct power_supply_desc axp20x_ac_power_desc = { + .name = "axp20x-ac", + .type = POWER_SUPPLY_TYPE_MAINS, + .properties = axp20x_ac_power_properties, + .num_properties = ARRAY_SIZE(axp20x_ac_power_properties), + .get_property = axp20x_ac_power_get_property, +}; + +static const struct power_supply_desc axp22x_ac_power_desc = { + .name = "axp22x-ac", + .type = POWER_SUPPLY_TYPE_MAINS, + .properties = axp22x_ac_power_properties, + .num_properties = ARRAY_SIZE(axp22x_ac_power_properties), + .get_property = axp20x_ac_power_get_property, +}; + +static const struct power_supply_desc axp813_ac_power_desc = { + .name = "axp813-ac", + .type = POWER_SUPPLY_TYPE_MAINS, + .properties = axp813_ac_power_properties, + .num_properties = ARRAY_SIZE(axp813_ac_power_properties), + .property_is_writeable = axp813_ac_power_prop_writeable, + .get_property = axp20x_ac_power_get_property, + .set_property = axp813_ac_power_set_property, +}; + +static const char * const axp20x_irq_names[] = { + "ACIN_PLUGIN", + "ACIN_REMOVAL", +}; + +struct axp_data { + const struct power_supply_desc *power_desc; + const char * const *irq_names; + unsigned int num_irq_names; + bool acin_adc; + bool acin_path_sel; +}; + +static const struct axp_data axp20x_data = { + .power_desc = &axp20x_ac_power_desc, + .irq_names = axp20x_irq_names, + .num_irq_names = ARRAY_SIZE(axp20x_irq_names), + .acin_adc = true, + .acin_path_sel = false, +}; + +static const struct axp_data axp22x_data = { + .power_desc = &axp22x_ac_power_desc, + .irq_names = axp20x_irq_names, + .num_irq_names = ARRAY_SIZE(axp20x_irq_names), + .acin_adc = false, + .acin_path_sel = false, +}; + +static const struct axp_data axp813_data = { + .power_desc = &axp813_ac_power_desc, + .irq_names = axp20x_irq_names, + .num_irq_names = ARRAY_SIZE(axp20x_irq_names), + .acin_adc = false, + .acin_path_sel = true, +}; + +#ifdef CONFIG_PM_SLEEP +static int axp20x_ac_power_suspend(struct device *dev) +{ + struct axp20x_ac_power *power = dev_get_drvdata(dev); + int i = 0; + + /* + * Allow wake via ACIN_PLUGIN only. + * + * As nested threaded IRQs are not automatically disabled during + * suspend, we must explicitly disable the remainder of the IRQs. + */ + if (device_may_wakeup(&power->supply->dev)) + enable_irq_wake(power->irqs[i++]); + while (i < power->num_irqs) + disable_irq(power->irqs[i++]); + + return 0; +} + +static int axp20x_ac_power_resume(struct device *dev) +{ + struct axp20x_ac_power *power = dev_get_drvdata(dev); + int i = 0; + + if (device_may_wakeup(&power->supply->dev)) + disable_irq_wake(power->irqs[i++]); + while (i < power->num_irqs) + enable_irq(power->irqs[i++]); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(axp20x_ac_power_pm_ops, axp20x_ac_power_suspend, + axp20x_ac_power_resume); + +static int axp20x_ac_power_probe(struct platform_device *pdev) +{ + struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); + struct power_supply_config psy_cfg = {}; + struct axp20x_ac_power *power; + const struct axp_data *axp_data; + int i, irq, ret; + + if (!of_device_is_available(pdev->dev.of_node)) + return -ENODEV; + + if (!axp20x) { + dev_err(&pdev->dev, "Parent drvdata not set\n"); + return -EINVAL; + } + + axp_data = of_device_get_match_data(&pdev->dev); + + power = devm_kzalloc(&pdev->dev, + struct_size(power, irqs, axp_data->num_irq_names), + GFP_KERNEL); + if (!power) + return -ENOMEM; + + if (axp_data->acin_adc) { + power->acin_v = devm_iio_channel_get(&pdev->dev, "acin_v"); + if (IS_ERR(power->acin_v)) { + if (PTR_ERR(power->acin_v) == -ENODEV) + return -EPROBE_DEFER; + return PTR_ERR(power->acin_v); + } + + power->acin_i = devm_iio_channel_get(&pdev->dev, "acin_i"); + if (IS_ERR(power->acin_i)) { + if (PTR_ERR(power->acin_i) == -ENODEV) + return -EPROBE_DEFER; + return PTR_ERR(power->acin_i); + } + } + + power->regmap = dev_get_regmap(pdev->dev.parent, NULL); + power->has_acin_path_sel = axp_data->acin_path_sel; + power->num_irqs = axp_data->num_irq_names; + + platform_set_drvdata(pdev, power); + + psy_cfg.of_node = pdev->dev.of_node; + psy_cfg.drv_data = power; + + power->supply = devm_power_supply_register(&pdev->dev, + axp_data->power_desc, + &psy_cfg); + if (IS_ERR(power->supply)) + return PTR_ERR(power->supply); + + /* Request irqs after registering, as irqs may trigger immediately */ + for (i = 0; i < axp_data->num_irq_names; i++) { + irq = platform_get_irq_byname(pdev, axp_data->irq_names[i]); + if (irq < 0) + return irq; + + power->irqs[i] = regmap_irq_get_virq(axp20x->regmap_irqc, irq); + ret = devm_request_any_context_irq(&pdev->dev, power->irqs[i], + axp20x_ac_power_irq, 0, + DRVNAME, power); + if (ret < 0) { + dev_err(&pdev->dev, "Error requesting %s IRQ: %d\n", + axp_data->irq_names[i], ret); + return ret; + } + } + + return 0; +} + +static const struct of_device_id axp20x_ac_power_match[] = { + { + .compatible = "x-powers,axp202-ac-power-supply", + .data = &axp20x_data, + }, { + .compatible = "x-powers,axp221-ac-power-supply", + .data = &axp22x_data, + }, { + .compatible = "x-powers,axp813-ac-power-supply", + .data = &axp813_data, + }, { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, axp20x_ac_power_match); + +static struct platform_driver axp20x_ac_power_driver = { + .probe = axp20x_ac_power_probe, + .driver = { + .name = DRVNAME, + .of_match_table = axp20x_ac_power_match, + .pm = &axp20x_ac_power_pm_ops, + }, +}; + +module_platform_driver(axp20x_ac_power_driver); + +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); +MODULE_DESCRIPTION("AXP20X and AXP22X PMICs' AC power supply driver"); +MODULE_LICENSE("GPL"); |