From nobody Thu Apr 2 15:41:43 2026 Received: from mail-lj1-f177.google.com (mail-lj1-f177.google.com [209.85.208.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 083E73DFC85 for ; Wed, 4 Mar 2026 18:58:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772650697; cv=none; b=J2FlwYhyytlvL+DRAvUGoxPaVND7I0ZhC57syrwl3x7LgoNrkX6CdG7uHiadLHwO0rwet6ExN9hGBt7hD5d4KW79eqPclldN3AaNcwS4fglVPbM7krI0gZj8j/mbm5/ME5AnOY10SiBwt049ts80YgpUSQNr9fgkHOktPeIHmvc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772650697; c=relaxed/simple; bh=kH6IxGWU9/YPnlpdIv152C9oL2JnvfglKibkmH2D9yc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=mS9fs47gPx51TWRqfDqopwbL8ztoKOmZ8B/oqe7grRlpO0afk6oGEH4AZV0+QThS/XO3IPSpF0d1s4RRW7CT9CMBt93fZazti3aB3G8ii3Es//kGldJpUlzaznWd+T5JwXgJlPxg2Hnh3FHV30pSxyuOdlkEiLpMdL66gedWDuA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=XL5TlMiC; arc=none smtp.client-ip=209.85.208.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XL5TlMiC" Received: by mail-lj1-f177.google.com with SMTP id 38308e7fff4ca-389e139ee5eso125989541fa.0 for ; Wed, 04 Mar 2026 10:58:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1772650692; x=1773255492; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=o3TwQJXKVq1pyC7HWfeudplW5CQQTbeaEyQZUhCqwB8=; b=XL5TlMiCpVWuKJzyj7siq+BkZ6jh2U1zvoKYFkMNcumO9QhRKD4i4S7nEdjsQuM1oP HKuCIC7i3fHV8FYMgVNUrqK7HpZJKuCroe4qvv97KLvccRsjkTxIUTTpsYJ+mfL0pf7A EfwIsvXAQAw/25bmANk2lZOeOM5c9I+S+IJxH67DGcmJi6+/fxcg4t72HKr+uCqquGvz 1haRHRlp6rnVHvkSnr9oPBPG449yUFlzBpMkxGxb9z90FjCdnSzuqqCb3C1XLUnJ9e2J Yr7yNYo6/aaZjqZhQVbbJ5rh6en2kaQTeL668pe7zLue3/D2NfUPGimPnXNkUd1xgNd/ vIpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772650692; x=1773255492; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=o3TwQJXKVq1pyC7HWfeudplW5CQQTbeaEyQZUhCqwB8=; b=arjLjlLDuL2z/o6thyAuvJnL/OWuIvSs2HsB5kf00EgV+nlpTIZzGUgZniiRljzu3Y I8a4Aw23Lk9c5RHj5+kPVu2hhkyUPkR3pBbdhRlTS+TJxE0UM6HNl74q40ncmFgUGlPW pJJRLNHJ/iE/ZB63GASlk4aKczHoeaLwEKTvm88QSduviMxlIdrliumcztZuFEXEpl+r /lFyMK3soVHDWT5f4xTFBYDdkaPS+AM/R+wfq6H3n86yu633dSi/foq/4s20cufsAku6 ykx5ddiq3Q3mzij4XEVgleBvB7nVooRSsHc/vIjWl9t6EYKuLKy01ev1HJhl9UXQSvZR pH0A== X-Forwarded-Encrypted: i=1; AJvYcCXQOJTmRITmlilvwhCE3EClJ1A0W00wwsJ5rSVVQt+vTUDnxG0D9aA5gAxdjR0lETR5UrnzrR+9vpUw6Mc=@vger.kernel.org X-Gm-Message-State: AOJu0Yw7YeKY0XnrfcK2rBf9IQFicN6uGsh4GzDmCX4FvEEXdcLSiQAe dhsGrihNk7KsoUOGP69kkaFYTD2aiXrwEAUuxIqbhqgdS+KuSSQcCJ+s X-Gm-Gg: ATEYQzywkDPNe6vWZfRhWEXdbqAwJezwCfW/dHg3WijkYtC6PGVOiqrKCYsmO07P3r4 4y+TifHtclJAio1Vom1k/pJgKIpCfTh4i2eUgKwKOp3RKcpF7kkpxokubwCQWxSVvnpVmkH0SKx zUZLWR8RUIk8noSmBdrNOMiquEO68y9pV5iPwFhBUgUyROZyCi5QcJO7UJmeOxHM7uo05pa4dNI neyJQUMzovfODPZfdytJZRVneSwPhGwMi5KwdRttbLWeHGCmbfZldwI41yJRU2qQ2F+Cvld27zw 1I4TWbxYMQKymxtyrj5p39HhwUerpcOC2Dx42NlfLat8aUayHzvibGIWz/e2p0gfMeP7QmDCdag 6sjwOs3oCmOfCRY1BgUdJ4Gm/IkMUhczzvJ+gkBWG3jYtdExR1TrNEhnG7zrkDq4oQlniKey+4i tiI7V4JLQMdQ3P X-Received: by 2002:a05:651c:f04:b0:389:fc69:45e8 with SMTP id 38308e7fff4ca-38a2c597194mr30443421fa.13.1772650691885; Wed, 04 Mar 2026 10:58:11 -0800 (PST) Received: from xeon ([188.163.112.72]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a12a6ddd3bsm704985e87.0.2026.03.04.10.58.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Mar 2026 10:58:11 -0800 (PST) From: Svyatoslav Ryhel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dmitry Torokhov , Lee Jones , Pavel Machek , Sebastian Reichel , Svyatoslav Ryhel , Ion Agorria , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v5 7/7] power: supply: Add charger driver for Asus Transformers Date: Wed, 4 Mar 2026 20:57:51 +0200 Message-ID: <20260304185751.83494-8-clamor95@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260304185751.83494-1-clamor95@gmail.com> References: <20260304185751.83494-1-clamor95@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Micha=C5=82 Miros=C5=82aw 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: Micha=C5=82 Miros=C5=82aw 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 | 193 ++++++++++++++++++ 3 files changed, 205 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 3c46b412632d..56800aab82f9 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -497,6 +497,17 @@ config CHARGER_88PM860X help Say Y here to enable charger for Marvell 88PM860x chip. =20 +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 aa5e6b05b018..24679f09bb61 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -68,6 +68,7 @@ obj-$(CONFIG_CHARGER_RT9471) +=3D rt9471.o obj-$(CONFIG_CHARGER_RT9756) +=3D rt9756.o obj-$(CONFIG_BATTERY_TWL4030_MADC) +=3D twl4030_madc_battery.o obj-$(CONFIG_CHARGER_88PM860X) +=3D 88pm860x_charger.o +obj-$(CONFIG_CHARGER_ASUS_TRANSFORMER_EC) +=3D asus-transformer-ec-charger= .o obj-$(CONFIG_CHARGER_PF1550) +=3D pf1550-charger.o obj-$(CONFIG_BATTERY_RX51) +=3D rx51_battery.o obj-$(CONFIG_AB8500_BM) +=3D 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/p= ower/supply/asus-transformer-ec-charger.c new file mode 100644 index 000000000000..de01f0bf2fd7 --- /dev/null +++ b/drivers/power/supply/asus-transformer-ec-charger.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include +#include + +struct asus_ec_charger_data { + struct notifier_block nb; + const struct asusec_info *ec; + struct power_supply *psy; + struct power_supply_desc psy_desc; +}; + +static enum power_supply_property asus_ec_charger_properties[] =3D { + 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 =3D power_supply_get_drvdata(psy); + enum power_supply_usb_type psu; + int ret; + u64 ctl; + + ret =3D asus_ec_get_ctl(priv->ec, &ctl); + if (ret) + return ret; + + switch (ctl & (ASUSEC_CTL_FULL_POWER_SOURCE | ASUSEC_CTL_DIRECT_POWER_SOU= RCE)) { + case ASUSEC_CTL_FULL_POWER_SOURCE: + psu =3D POWER_SUPPLY_USB_TYPE_CDP; /* DOCK */ + break; + case ASUSEC_CTL_DIRECT_POWER_SOURCE: + psu =3D POWER_SUPPLY_USB_TYPE_SDP; /* USB */ + break; + case 0: + psu =3D POWER_SUPPLY_USB_TYPE_UNKNOWN; /* no power source connected */ + break; + default: + psu =3D POWER_SUPPLY_USB_TYPE_ACA; /* power adapter */ + break; + } + + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + val->intval =3D psu !=3D POWER_SUPPLY_USB_TYPE_UNKNOWN; + return 0; + + case POWER_SUPPLY_PROP_USB_TYPE: + val->intval =3D psu; + return 0; + + case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: + if (ctl & ASUSEC_CTL_TEST_DISCHARGE) + val->intval =3D POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE; + else if (ctl & ASUSEC_CTL_USB_CHARGE) + val->intval =3D POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO; + else + val->intval =3D POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE; + return 0; + + case POWER_SUPPLY_PROP_MODEL_NAME: + val->strval =3D priv->ec->model; + 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 =3D 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_ec_update_ctl(priv->ec, + ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE, + ASUSEC_CTL_USB_CHARGE); + + case POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE: + return asus_ec_clear_ctl_bits(priv->ec, + ASUSEC_CTL_TEST_DISCHARGE | ASUSEC_CTL_USB_CHARGE); + + case POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE: + return asus_ec_update_ctl(priv->ec, + 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 =3D { + .name =3D "asus-ec-charger", + .type =3D POWER_SUPPLY_TYPE_USB, + .charge_behaviours =3D BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO) | + BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE) | + BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE), + .usb_types =3D 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 =3D asus_ec_charger_properties, + .num_properties =3D ARRAY_SIZE(asus_ec_charger_properties), + .get_property =3D asus_ec_charger_get_property, + .set_property =3D asus_ec_charger_set_property, + .property_is_writeable =3D asus_ec_charger_property_is_writeable, + .no_thermal =3D true, +}; + +static int asus_ec_charger_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct asus_ec_charger_data *priv =3D + 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 asus_ec_charger_data *priv; + struct device *dev =3D &pdev->dev; + struct power_supply_config cfg =3D { }; + + priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + priv->ec =3D cell_to_ec(pdev); + + cfg.fwnode =3D dev_fwnode(dev->parent); + cfg.drv_data =3D priv; + + memcpy(&priv->psy_desc, &asus_ec_charger_desc, sizeof(priv->psy_desc)); + priv->psy_desc.name =3D devm_kasprintf(dev, GFP_KERNEL, "%s-charger", + priv->ec->name); + + priv->psy =3D 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 =3D asus_ec_charger_notify; + + return devm_asus_ec_register_notifier(pdev, &priv->nb); +} + +static struct platform_driver asus_ec_charger_driver =3D { + .driver.name =3D "asus-transformer-ec-charger", + .probe =3D asus_ec_charger_probe, +}; +module_platform_driver(asus_ec_charger_driver); + +MODULE_AUTHOR("Micha=C5=82 Miros=C5=82aw "); +MODULE_DESCRIPTION("ASUS Transformer Pad battery charger driver"); +MODULE_LICENSE("GPL"); --=20 2.51.0