/* * AXP20x PMIC USB power supply status driver * * Copyright (C) 2015 Hans de Goede * Copyright (C) 2014 Bruno Prémont * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #define DRVNAME "axp20x-usb-power-supply" #define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5) #define AXP20X_PWR_STATUS_VBUS_USED BIT(4) #define AXP20X_USB_STATUS_VBUS_VALID BIT(2) #define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000) #define AXP20X_VBUS_CLIMIT_MASK 3 #define AXP20X_VBUC_CLIMIT_900mA 0 #define AXP20X_VBUC_CLIMIT_500mA 1 #define AXP20X_VBUC_CLIMIT_100mA 2 #define AXP20X_VBUC_CLIMIT_NONE 3 #define AXP20X_ADC_EN1_VBUS_CURR BIT(2) #define AXP20X_ADC_EN1_VBUS_VOLT BIT(3) #define AXP20X_VBUS_MON_VBUS_VALID BIT(3) struct axp20x_usb_power { struct regmap *regmap; struct power_supply *supply; }; static irqreturn_t axp20x_usb_power_irq(int irq, void *devid) { struct axp20x_usb_power *power = devid; power_supply_changed(power->supply); return IRQ_HANDLED; } static int axp20x_usb_power_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct axp20x_usb_power *power = power_supply_get_drvdata(psy); unsigned int input, v; int ret; switch (psp) { case POWER_SUPPLY_PROP_VOLTAGE_MIN: ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v); if (ret) return ret; val->intval = AXP20X_VBUS_VHOLD_uV(v); return 0; case POWER_SUPPLY_PROP_VOLTAGE_NOW: ret = axp20x_read_variable_width(power->regmap, AXP20X_VBUS_V_ADC_H, 12); if (ret < 0) return ret; val->intval = ret * 1700; /* 1 step = 1.7 mV */ return 0; case POWER_SUPPLY_PROP_CURRENT_MAX: ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v); if (ret) return ret; switch (v & AXP20X_VBUS_CLIMIT_MASK) { case AXP20X_VBUC_CLIMIT_100mA: val->intval = 100000; break; case AXP20X_VBUC_CLIMIT_500mA: val->intval = 500000; break; case AXP20X_VBUC_CLIMIT_900mA: val->intval = 900000; break; case AXP20X_VBUC_CLIMIT_NONE: val->intval = -1; break; } return 0; case POWER_SUPPLY_PROP_CURRENT_NOW: ret = axp20x_read_variable_width(power->regmap, AXP20X_VBUS_I_ADC_H, 12); if (ret < 0) return ret; val->intval = ret * 375; /* 1 step = 0.375 mA */ return 0; default: break; } /* All the properties below need the input-status reg value */ ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input); if (ret) return ret; switch (psp) { case POWER_SUPPLY_PROP_HEALTH: if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) { val->intval = POWER_SUPPLY_HEALTH_UNKNOWN; break; } ret = regmap_read(power->regmap, AXP20X_USB_OTG_STATUS, &v); if (ret) return ret; if (!(v & AXP20X_USB_STATUS_VBUS_VALID)) { val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; break; } val->intval = POWER_SUPPLY_HEALTH_GOOD; break; case POWER_SUPPLY_PROP_PRESENT: val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT); break; case POWER_SUPPLY_PROP_ONLINE: val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED); break; default: return -EINVAL; } return 0; } static enum power_supply_property axp20x_usb_power_properties[] = { POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_MIN, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_CURRENT_MAX, POWER_SUPPLY_PROP_CURRENT_NOW, }; static const struct power_supply_desc axp20x_usb_power_desc = { .name = "axp20x-usb", .type = POWER_SUPPLY_TYPE_USB, .properties = axp20x_usb_power_properties, .num_properties = ARRAY_SIZE(axp20x_usb_power_properties), .get_property = axp20x_usb_power_get_property, }; static int axp20x_usb_power_probe(struct platform_device *pdev) { struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); struct power_supply_config psy_cfg = {}; struct axp20x_usb_power *power; static const char * const irq_names[] = { "VBUS_PLUGIN", "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID" }; 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; } power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL); if (!power) return -ENOMEM; power->regmap = axp20x->regmap; /* Enable vbus valid checking */ ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON, AXP20X_VBUS_MON_VBUS_VALID, AXP20X_VBUS_MON_VBUS_VALID); if (ret) return ret; /* Enable vbus voltage and current measurement */ ret = regmap_update_bits(power->regmap, AXP20X_ADC_EN1, AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT, AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT); if (ret) return ret; psy_cfg.of_node = pdev->dev.of_node; psy_cfg.drv_data = power; power->supply = devm_power_supply_register(&pdev->dev, &axp20x_usb_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 < ARRAY_SIZE(irq_names); i++) { irq = platform_get_irq_byname(pdev, irq_names[i]); if (irq < 0) { dev_warn(&pdev->dev, "No IRQ for %s: %d\n", irq_names[i], irq); continue; } irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq); ret = devm_request_any_context_irq(&pdev->dev, irq, axp20x_usb_power_irq, 0, DRVNAME, power); if (ret < 0) dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n", irq_names[i], ret); } return 0; } static const struct of_device_id axp20x_usb_power_match[] = { { .compatible = "x-powers,axp202-usb-power-supply" }, { } }; MODULE_DEVICE_TABLE(of, axp20x_usb_power_match); static struct platform_driver axp20x_usb_power_driver = { .probe = axp20x_usb_power_probe, .driver = { .name = DRVNAME, .of_match_table = axp20x_usb_power_match, }, }; module_platform_driver(axp20x_usb_power_driver); MODULE_AUTHOR("Hans de Goede "); MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver"); MODULE_LICENSE("GPL");