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Wed, 04 Nov 2026 04:26:40 -0800 (PST) Received: from xeon ([188.163.112.62]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b43da9825bsm50492415e9.15.2026.11.04.04.26.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Nov 2026 04:26:38 -0800 (PST) From: Svyatoslav Ryhel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dmitry Torokhov , Lee Jones , Pavel Machek , Griffin Kroah-Hartman , Sebastian Reichel , Svyatoslav Ryhel , Ion Agorria , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= , Florian Krischer Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, mfd@lists.linux.dev, linux-leds@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v13 7/7] power: supply: Add charger driver for Asus Transformers Date: Wed, 4 Nov 2026 14:26:06 +0200 Message-ID: <20261104122606.215629-8-clamor95@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261104122606.215629-1-clamor95@gmail.com> References: <20261104122606.215629-1-clamor95@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Michał Mirosław Add support for charger detection capabilities found in the embedded controller of ASUS Transformer devices. Suggested-by: Maxim Schwalm Suggested-by: Svyatoslav Ryhel Signed-off-by: Michał Mirosław Signed-off-by: Svyatoslav Ryhel Reviewed-by: Sebastian Reichel --- drivers/power/supply/Kconfig | 11 + drivers/power/supply/Makefile | 1 + .../supply/asus-transformer-ec-charger.c | 208 ++++++++++++++++++ 3 files changed, 220 insertions(+) create mode 100644 drivers/power/supply/asus-transformer-ec-charger.c diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index 856eb81c97ae9..16d0a38b41b7e 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -508,6 +508,17 @@ config CHARGER_88PM860X help Say Y here to enable charger for Marvell 88PM860x chip. +config CHARGER_ASUS_TRANSFORMER_EC + tristate "Asus Transformer's charger driver" + depends on MFD_ASUS_TRANSFORMER_EC + help + Say Y here to enable support AC plug detection on Asus Transformer + Dock. + + This sub-driver supports charger detection mechanism found in Asus + Transformer tablets and mobile docks and controlled by special + embedded controller. + config CHARGER_PF1550 tristate "NXP PF1550 battery charger driver" depends on MFD_PF1550 diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index bec4a6263048c..cd3640f4b7480 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_CHARGER_RT9471) += rt9471.o obj-$(CONFIG_CHARGER_RT9756) += rt9756.o obj-$(CONFIG_BATTERY_TWL4030_MADC) += twl4030_madc_battery.o obj-$(CONFIG_CHARGER_88PM860X) += 88pm860x_charger.o +obj-$(CONFIG_CHARGER_ASUS_TRANSFORMER_EC) += asus-transformer-ec-charger.o obj-$(CONFIG_CHARGER_PF1550) += pf1550-charger.o obj-$(CONFIG_BATTERY_RX51) += rx51_battery.o obj-$(CONFIG_AB8500_BM) += ab8500_bmdata.o ab8500_charger.o ab8500_fg.o ab8500_btemp.o ab8500_chargalg.o diff --git a/drivers/power/supply/asus-transformer-ec-charger.c b/drivers/power/supply/asus-transformer-ec-charger.c new file mode 100644 index 0000000000000..c7a6bd2ba533f --- /dev/null +++ b/drivers/power/supply/asus-transformer-ec-charger.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include +#include + +struct asus_ec_charger_data { + struct notifier_block nb; + struct asusec_core *ec; + struct power_supply *psy; + struct power_supply_desc psy_desc; +}; + +static enum power_supply_property asus_ec_charger_properties[] = { + POWER_SUPPLY_PROP_USB_TYPE, + POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_MODEL_NAME, +}; + +static int asus_ec_charger_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct asus_ec_charger_data *priv = power_supply_get_drvdata(psy); + enum power_supply_usb_type psu; + int ret; + u64 ctl; + + /* Check if model name is requested first since it needs no hw access */ + if (psp == POWER_SUPPLY_PROP_MODEL_NAME) { + val->strval = priv->ec->model; + return 0; + } + + ret = asus_dockram_access_ctl(priv->ec->dockram, &ctl, 0, 0); + if (ret) + return ret; + + switch (ctl & (ASUSEC_CTL_FULL_POWER_SOURCE | ASUSEC_CTL_DIRECT_POWER_SOURCE)) { + case ASUSEC_CTL_FULL_POWER_SOURCE: + psu = POWER_SUPPLY_USB_TYPE_CDP; /* DOCK */ + break; + case ASUSEC_CTL_DIRECT_POWER_SOURCE: + psu = POWER_SUPPLY_USB_TYPE_SDP; /* USB */ + break; + case 0: + psu = POWER_SUPPLY_USB_TYPE_UNKNOWN; /* no power source connected */ + break; + default: + psu = POWER_SUPPLY_USB_TYPE_ACA; /* power adapter */ + break; + } + + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + val->intval = psu != POWER_SUPPLY_USB_TYPE_UNKNOWN; + return 0; + + case POWER_SUPPLY_PROP_USB_TYPE: + val->intval = psu; + return 0; + + case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: + if (ctl & ASUSEC_CTL_TEST_DISCHARGE) + val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE; + else if (ctl & ASUSEC_CTL_USB_CHARGE) + val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO; + else + val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE; + return 0; + + default: + return -EINVAL; + } +} + +static int asus_ec_charger_set_property(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct asus_ec_charger_data *priv = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: + switch ((enum power_supply_charge_behaviour)val->intval) { + case POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO: + return asus_dockram_access_ctl(priv->ec->dockram, NULL, + ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE, + ASUSEC_CTL_USB_CHARGE); + + case POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE: + return asus_dockram_access_ctl(priv->ec->dockram, NULL, + ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE, 0); + + case POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE: + return asus_dockram_access_ctl(priv->ec->dockram, NULL, + ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE, + ASUSEC_CTL_TEST_DISCHARGE); + default: + return -EINVAL; + } + + default: + return -EINVAL; + } +} + +static int asus_ec_charger_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + switch (psp) { + case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: + return true; + default: + return false; + } +} + +static const struct power_supply_desc asus_ec_charger_desc = { + .name = "asus-ec-charger", + .type = POWER_SUPPLY_TYPE_USB, + .charge_behaviours = BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO) | + BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE) | + BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE), + .usb_types = BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN) | + BIT(POWER_SUPPLY_USB_TYPE_SDP) | + BIT(POWER_SUPPLY_USB_TYPE_CDP) | + BIT(POWER_SUPPLY_USB_TYPE_ACA), + .properties = asus_ec_charger_properties, + .num_properties = ARRAY_SIZE(asus_ec_charger_properties), + .get_property = asus_ec_charger_get_property, + .set_property = asus_ec_charger_set_property, + .property_is_writeable = asus_ec_charger_property_is_writeable, + .no_thermal = true, +}; + +static int asus_ec_charger_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct asus_ec_charger_data *priv = + container_of(nb, struct asus_ec_charger_data, nb); + + switch (action) { + case ASUSEC_SMI_ACTION(POWER_NOTIFY): + case ASUSEC_SMI_ACTION(ADAPTER_EVENT): + power_supply_changed(priv->psy); + break; + } + + return NOTIFY_DONE; +} + +static int asus_ec_charger_probe(struct platform_device *pdev) +{ + struct asusec_core *ec = dev_get_drvdata(pdev->dev.parent); + struct asus_ec_charger_data *priv; + struct device *dev = &pdev->dev; + struct power_supply_config cfg = { }; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + priv->ec = ec; + + cfg.fwnode = dev_fwnode(dev->parent); + cfg.drv_data = priv; + + memcpy(&priv->psy_desc, &asus_ec_charger_desc, sizeof(priv->psy_desc)); + priv->psy_desc.name = devm_kasprintf(dev, GFP_KERNEL, "%s-charger", + priv->ec->name); + if (!priv->psy_desc.name) + return -ENOMEM; + + priv->psy = devm_power_supply_register(dev, &priv->psy_desc, &cfg); + if (IS_ERR(priv->psy)) + return dev_err_probe(dev, PTR_ERR(priv->psy), + "Failed to register power supply\n"); + + priv->nb.notifier_call = asus_ec_charger_notify; + + return blocking_notifier_chain_register(&ec->notify_list, &priv->nb); +} + +static void asus_ec_charger_remove(struct platform_device *pdev) +{ + struct asus_ec_charger_data *priv = platform_get_drvdata(pdev); + struct asusec_core *ec = priv->ec; + + blocking_notifier_chain_unregister(&ec->notify_list, &priv->nb); +} + +static struct platform_driver asus_ec_charger_driver = { + .driver.name = "asus-transformer-ec-charger", + .probe = asus_ec_charger_probe, + .remove = asus_ec_charger_remove, +}; +module_platform_driver(asus_ec_charger_driver); + +MODULE_ALIAS("platform:asus-transformer-ec-charger"); +MODULE_AUTHOR("Michał Mirosław "); +MODULE_DESCRIPTION("ASUS Transformer Pad battery charger driver"); +MODULE_LICENSE("GPL"); -- 2.53.0