// SPDX-License-Identifier: GPL-2.0-or-later /* * AXP20x PMIC USB power supply status driver * * Copyright (C) 2015 Hans de Goede * Copyright (C) 2014 Bruno PrĂ©mont */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRVNAME "axp20x-usb-power-supply" #define AXP192_USB_OTG_STATUS 0x04 #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_VHOLD_MASK GENMASK(5, 3) #define AXP20X_VBUS_VHOLD_OFFSET 3 #define AXP20X_ADC_EN1_VBUS_CURR BIT(2) #define AXP20X_ADC_EN1_VBUS_VOLT BIT(3) /* * Note do not raise the debounce time, we must report Vusb high within * 100ms otherwise we get Vbus errors in musb. */ #define DEBOUNCE_TIME msecs_to_jiffies(50) struct axp_data { const struct power_supply_desc *power_desc; const char * const *irq_names; unsigned int num_irq_names; const int *curr_lim_table; int curr_lim_table_size; struct reg_field curr_lim_fld; struct reg_field vbus_valid_bit; struct reg_field vbus_mon_bit; struct reg_field usb_bc_en_bit; struct reg_field usb_bc_det_fld; struct reg_field vbus_disable_bit; bool vbus_needs_polling: 1; }; struct axp20x_usb_power { struct device *dev; struct regmap *regmap; struct regmap_field *curr_lim_fld; struct regmap_field *vbus_valid_bit; struct regmap_field *vbus_mon_bit; struct regmap_field *usb_bc_en_bit; struct regmap_field *usb_bc_det_fld; struct regmap_field *vbus_disable_bit; struct power_supply *supply; const struct axp_data *axp_data; struct iio_channel *vbus_v; struct iio_channel *vbus_i; struct delayed_work vbus_detect; unsigned int old_status; unsigned int online; unsigned int num_irqs; unsigned int irqs[] __counted_by(num_irqs); }; static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power) { /* * Polling is only necessary while VBUS is offline. While online, a * present->absent transition implies an online->offline transition * and will trigger the VBUS_REMOVAL IRQ. */ if (power->axp_data->vbus_needs_polling && !power->online) return true; return false; } static irqreturn_t axp20x_usb_power_irq(int irq, void *devid) { struct axp20x_usb_power *power = devid; power_supply_changed(power->supply); mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME); return IRQ_HANDLED; } static void axp20x_usb_power_poll_vbus(struct work_struct *work) { struct axp20x_usb_power *power = container_of(work, struct axp20x_usb_power, vbus_detect.work); unsigned int val; int ret; ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val); if (ret) goto out; val &= (AXP20X_PWR_STATUS_VBUS_PRESENT | AXP20X_PWR_STATUS_VBUS_USED); if (val != power->old_status) power_supply_changed(power->supply); if (power->usb_bc_en_bit && (val & AXP20X_PWR_STATUS_VBUS_PRESENT) != (power->old_status & AXP20X_PWR_STATUS_VBUS_PRESENT)) { dev_dbg(power->dev, "Cable status changed, re-enabling USB BC"); ret = regmap_field_write(power->usb_bc_en_bit, 1); if (ret) dev_err(power->dev, "failed to enable USB BC: errno %d", ret); } power->old_status = val; power->online = val & AXP20X_PWR_STATUS_VBUS_USED; out: if (axp20x_usb_vbus_needs_polling(power)) mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME); } static int axp20x_get_usb_type(struct axp20x_usb_power *power, union power_supply_propval *val) { unsigned int reg; int ret; if (!power->usb_bc_det_fld) return -EINVAL; ret = regmap_field_read(power->usb_bc_det_fld, ®); if (ret) return ret; switch (reg) { case 1: val->intval = POWER_SUPPLY_USB_TYPE_SDP; break; case 2: val->intval = POWER_SUPPLY_USB_TYPE_CDP; break; case 3: val->intval = POWER_SUPPLY_USB_TYPE_DCP; break; default: val->intval = POWER_SUPPLY_USB_TYPE_UNKNOWN; break; } return 0; } 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: if (IS_ENABLED(CONFIG_AXP20X_ADC)) { ret = iio_read_channel_processed(power->vbus_v, &val->intval); if (ret) return ret; /* * IIO framework gives mV but Power Supply framework * gives uV. */ val->intval *= 1000; return 0; } 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_INPUT_CURRENT_LIMIT: ret = regmap_field_read(power->curr_lim_fld, &v); if (ret) return ret; if (v < power->axp_data->curr_lim_table_size) val->intval = power->axp_data->curr_lim_table[v]; else val->intval = power->axp_data->curr_lim_table[ power->axp_data->curr_lim_table_size - 1]; return 0; case POWER_SUPPLY_PROP_CURRENT_NOW: if (IS_ENABLED(CONFIG_AXP20X_ADC)) { ret = iio_read_channel_processed(power->vbus_i, &val->intval); if (ret) return ret; /* * IIO framework gives mA but Power Supply framework * gives uA. */ val->intval *= 1000; return 0; } 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; case POWER_SUPPLY_PROP_USB_TYPE: return axp20x_get_usb_type(power, val); 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; } val->intval = POWER_SUPPLY_HEALTH_GOOD; if (power->vbus_valid_bit) { ret = regmap_field_read(power->vbus_valid_bit, &v); if (ret) return ret; if (v == 0) val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; } 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 int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power, int intval) { int val; switch (intval) { case 4000000: case 4100000: case 4200000: case 4300000: case 4400000: case 4500000: case 4600000: case 4700000: val = (intval - 4000000) / 100000; return regmap_update_bits(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, AXP20X_VBUS_VHOLD_MASK, val << AXP20X_VBUS_VHOLD_OFFSET); default: return -EINVAL; } return -EINVAL; } static int axp20x_usb_power_set_input_current_limit(struct axp20x_usb_power *power, int intval) { int ret; unsigned int reg; const unsigned int max = power->axp_data->curr_lim_table_size; if (intval == -1) return -EINVAL; /* * BC1.2 detection can cause a race condition if we try to set a current * limit while it's in progress. When it finishes it will overwrite the * current limit we just set. */ if (power->usb_bc_en_bit) { dev_dbg(power->dev, "disabling BC1.2 detection because current limit was set"); ret = regmap_field_write(power->usb_bc_en_bit, 0); if (ret) return ret; } for (reg = max - 1; reg > 0; reg--) if (power->axp_data->curr_lim_table[reg] <= intval) break; dev_dbg(power->dev, "setting input current limit reg to %d (%d uA), requested %d uA", reg, power->axp_data->curr_lim_table[reg], intval); return regmap_field_write(power->curr_lim_fld, reg); } static int axp20x_usb_power_set_property(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val) { struct axp20x_usb_power *power = power_supply_get_drvdata(psy); switch (psp) { case POWER_SUPPLY_PROP_ONLINE: if (!power->vbus_disable_bit) return -EINVAL; return regmap_field_write(power->vbus_disable_bit, !val->intval); case POWER_SUPPLY_PROP_VOLTAGE_MIN: return axp20x_usb_power_set_voltage_min(power, val->intval); case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: return axp20x_usb_power_set_input_current_limit(power, val->intval); default: return -EINVAL; } return -EINVAL; } static int axp20x_usb_power_prop_writeable(struct power_supply *psy, enum power_supply_property psp) { struct axp20x_usb_power *power = power_supply_get_drvdata(psy); /* * The VBUS path select flag works differently on AXP288 and newer: * - On AXP20x and AXP22x, the flag enables VBUS (ignoring N_VBUSEN). * - On AXP288 and AXP8xx, the flag disables VBUS (ignoring N_VBUSEN). * We only expose the control on variants where it can be used to force * the VBUS input offline. */ if (psp == POWER_SUPPLY_PROP_ONLINE) return power->vbus_disable_bit != NULL; return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN || psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT; } 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_INPUT_CURRENT_LIMIT, POWER_SUPPLY_PROP_CURRENT_NOW, }; static enum power_supply_property axp22x_usb_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 enum power_supply_property axp813_usb_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, POWER_SUPPLY_PROP_USB_TYPE, }; static enum power_supply_usb_type axp813_usb_types[] = { POWER_SUPPLY_USB_TYPE_SDP, POWER_SUPPLY_USB_TYPE_DCP, POWER_SUPPLY_USB_TYPE_CDP, POWER_SUPPLY_USB_TYPE_UNKNOWN, }; 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), .property_is_writeable = axp20x_usb_power_prop_writeable, .get_property = axp20x_usb_power_get_property, .set_property = axp20x_usb_power_set_property, }; static const struct power_supply_desc axp22x_usb_power_desc = { .name = "axp20x-usb", .type = POWER_SUPPLY_TYPE_USB, .properties = axp22x_usb_power_properties, .num_properties = ARRAY_SIZE(axp22x_usb_power_properties), .property_is_writeable = axp20x_usb_power_prop_writeable, .get_property = axp20x_usb_power_get_property, .set_property = axp20x_usb_power_set_property, }; static const struct power_supply_desc axp813_usb_power_desc = { .name = "axp20x-usb", .type = POWER_SUPPLY_TYPE_USB, .properties = axp813_usb_power_properties, .num_properties = ARRAY_SIZE(axp813_usb_power_properties), .property_is_writeable = axp20x_usb_power_prop_writeable, .get_property = axp20x_usb_power_get_property, .set_property = axp20x_usb_power_set_property, .usb_types = axp813_usb_types, .num_usb_types = ARRAY_SIZE(axp813_usb_types), }; static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN", "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", }; static const char * const axp22x_irq_names[] = { "VBUS_PLUGIN", "VBUS_REMOVAL", }; static int axp192_usb_curr_lim_table[] = { -1, -1, 500000, 100000, }; static int axp20x_usb_curr_lim_table[] = { 900000, 500000, 100000, -1, }; static int axp221_usb_curr_lim_table[] = { 900000, 500000, -1, -1, }; static int axp813_usb_curr_lim_table[] = { 100000, 500000, 900000, 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, }; static const struct axp_data axp192_data = { .power_desc = &axp20x_usb_power_desc, .irq_names = axp20x_irq_names, .num_irq_names = ARRAY_SIZE(axp20x_irq_names), .curr_lim_table = axp192_usb_curr_lim_table, .curr_lim_table_size = ARRAY_SIZE(axp192_usb_curr_lim_table), .curr_lim_fld = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 0, 1), .vbus_valid_bit = REG_FIELD(AXP192_USB_OTG_STATUS, 2, 2), .vbus_mon_bit = REG_FIELD(AXP20X_VBUS_MON, 3, 3), }; static const struct axp_data axp202_data = { .power_desc = &axp20x_usb_power_desc, .irq_names = axp20x_irq_names, .num_irq_names = ARRAY_SIZE(axp20x_irq_names), .curr_lim_table = axp20x_usb_curr_lim_table, .curr_lim_table_size = ARRAY_SIZE(axp20x_usb_curr_lim_table), .curr_lim_fld = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 0, 1), .vbus_valid_bit = REG_FIELD(AXP20X_USB_OTG_STATUS, 2, 2), .vbus_mon_bit = REG_FIELD(AXP20X_VBUS_MON, 3, 3), }; static const struct axp_data axp221_data = { .power_desc = &axp22x_usb_power_desc, .irq_names = axp22x_irq_names, .num_irq_names = ARRAY_SIZE(axp22x_irq_names), .curr_lim_table = axp221_usb_curr_lim_table, .curr_lim_table_size = ARRAY_SIZE(axp221_usb_curr_lim_table), .curr_lim_fld = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 0, 1), .vbus_needs_polling = true, }; static const struct axp_data axp223_data = { .power_desc = &axp22x_usb_power_desc, .irq_names = axp22x_irq_names, .num_irq_names = ARRAY_SIZE(axp22x_irq_names), .curr_lim_table = axp20x_usb_curr_lim_table, .curr_lim_table_size = ARRAY_SIZE(axp20x_usb_curr_lim_table), .curr_lim_fld = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 0, 1), .vbus_needs_polling = true, }; static const struct axp_data axp813_data = { .power_desc = &axp813_usb_power_desc, .irq_names = axp22x_irq_names, .num_irq_names = ARRAY_SIZE(axp22x_irq_names), .curr_lim_table = axp813_usb_curr_lim_table, .curr_lim_table_size = ARRAY_SIZE(axp813_usb_curr_lim_table), .curr_lim_fld = REG_FIELD(AXP22X_CHRG_CTRL3, 4, 7), .usb_bc_en_bit = REG_FIELD(AXP288_BC_GLOBAL, 0, 0), .usb_bc_det_fld = REG_FIELD(AXP288_BC_DET_STAT, 5, 7), .vbus_disable_bit = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 7, 7), .vbus_needs_polling = true, }; #ifdef CONFIG_PM_SLEEP static int axp20x_usb_power_suspend(struct device *dev) { struct axp20x_usb_power *power = dev_get_drvdata(dev); int i = 0; /* * Allow wake via VBUS_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_usb_power_resume(struct device *dev) { struct axp20x_usb_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++]); mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME); return 0; } #endif static SIMPLE_DEV_PM_OPS(axp20x_usb_power_pm_ops, axp20x_usb_power_suspend, axp20x_usb_power_resume); static int configure_iio_channels(struct platform_device *pdev, struct axp20x_usb_power *power) { power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v"); if (IS_ERR(power->vbus_v)) { if (PTR_ERR(power->vbus_v) == -ENODEV) return -EPROBE_DEFER; return PTR_ERR(power->vbus_v); } power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i"); if (IS_ERR(power->vbus_i)) { if (PTR_ERR(power->vbus_i) == -ENODEV) return -EPROBE_DEFER; return PTR_ERR(power->vbus_i); } return 0; } static int configure_adc_registers(struct axp20x_usb_power *power) { /* Enable vbus voltage and current measurement */ return 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); } static int axp20x_regmap_field_alloc_optional(struct device *dev, struct regmap *regmap, struct reg_field fdesc, struct regmap_field **fieldp) { struct regmap_field *field; if (fdesc.reg == 0) { *fieldp = NULL; return 0; } field = devm_regmap_field_alloc(dev, regmap, fdesc); if (IS_ERR(field)) return PTR_ERR(field); *fieldp = field; return 0; } 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; 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; platform_set_drvdata(pdev, power); power->dev = &pdev->dev; power->axp_data = axp_data; power->regmap = axp20x->regmap; power->num_irqs = axp_data->num_irq_names; power->curr_lim_fld = devm_regmap_field_alloc(&pdev->dev, power->regmap, axp_data->curr_lim_fld); if (IS_ERR(power->curr_lim_fld)) return PTR_ERR(power->curr_lim_fld); ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap, axp_data->vbus_valid_bit, &power->vbus_valid_bit); if (ret) return ret; ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap, axp_data->vbus_mon_bit, &power->vbus_mon_bit); if (ret) return ret; ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap, axp_data->usb_bc_en_bit, &power->usb_bc_en_bit); if (ret) return ret; ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap, axp_data->usb_bc_det_fld, &power->usb_bc_det_fld); if (ret) return ret; ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap, axp_data->vbus_disable_bit, &power->vbus_disable_bit); if (ret) return ret; ret = devm_delayed_work_autocancel(&pdev->dev, &power->vbus_detect, axp20x_usb_power_poll_vbus); if (ret) return ret; if (power->vbus_mon_bit) { /* Enable vbus valid checking */ ret = regmap_field_write(power->vbus_mon_bit, 1); if (ret) return ret; if (IS_ENABLED(CONFIG_AXP20X_ADC)) ret = configure_iio_channels(pdev, power); else ret = configure_adc_registers(power); if (ret) return ret; } if (power->usb_bc_en_bit) { /* Enable USB Battery Charging specification detection */ ret = regmap_field_write(power->usb_bc_en_bit, 1); 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, 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_usb_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; } } if (axp20x_usb_vbus_needs_polling(power)) queue_delayed_work(system_power_efficient_wq, &power->vbus_detect, 0); return 0; } static const struct of_device_id axp20x_usb_power_match[] = { { .compatible = "x-powers,axp192-usb-power-supply", .data = &axp192_data, }, { .compatible = "x-powers,axp202-usb-power-supply", .data = &axp202_data, }, { .compatible = "x-powers,axp221-usb-power-supply", .data = &axp221_data, }, { .compatible = "x-powers,axp223-usb-power-supply", .data = &axp223_data, }, { .compatible = "x-powers,axp813-usb-power-supply", .data = &axp813_data, }, { /* sentinel */ } }; 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, .pm = &axp20x_usb_power_pm_ops, }, }; module_platform_driver(axp20x_usb_power_driver); MODULE_AUTHOR("Hans de Goede "); MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver"); MODULE_LICENSE("GPL");