From nobody Mon Feb 9 23:03:39 2026 Received: from mail-oi1-f182.google.com (mail-oi1-f182.google.com [209.85.167.182]) (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 A44F715B10E for ; Fri, 22 Nov 2024 03:47:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732247259; cv=none; b=AzOOnN3df1fJJTEEa2/gh0JDgJ5fvWMaOtiz0ev8tEhaF88lFsuMI8I88OIA0H2YDVNEi4XS4lcRYGu7NoH06mV5sWrC6wNfnEyluUJzRKqkH3+qJoVsdZ3Q8JV3hNdUZTrMur7jN7mQha8P97TLEc+X5DOhhxzzV6X3YxH16JE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732247259; c=relaxed/simple; bh=0NAcyLrHHDhRn82WN0izrFPbVZrkw97X7FSs9cPtqXA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=S8hqfPOdTBmIwwPOa7aHXxHFg8eFqFTF+lP4iKLUtpZE+IxOoJTTF6hwO9FVQ0q+g3uqAkWuuq2u/FwxR9VtcKLG5m3jXUKvFi9R7d/H9kt0+uRkYjyIHQlVDPd6ZPhU3h6Nepw1cZOuVhebVaeFoQctowvW/R1L4+z26lEVlZc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=ldm3BVuK; arc=none smtp.client-ip=209.85.167.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="ldm3BVuK" Received: by mail-oi1-f182.google.com with SMTP id 5614622812f47-3e5fb8a4e53so977177b6e.1 for ; Thu, 21 Nov 2024 19:47:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1732247257; x=1732852057; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=d5LY5RXpPtd9Rkf3ibKsfLHvQo7hHTlxcwyEUNtbdks=; b=ldm3BVuKcKz0tbeR1U7DEVCZrbFmFBHgKAmqtzW+UCdmnBol8RdEwkh/8NV4nDEEQM ZqUpOFo8IvzsH5McV57SOr6QKc/7wwNGRK1U9MwwPzEuN9eZSFj83i92mPXxyuaUJKcE kmtkvUATTjqZptD6gAuiYEKcb1YL76nTeRfcQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732247257; x=1732852057; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=d5LY5RXpPtd9Rkf3ibKsfLHvQo7hHTlxcwyEUNtbdks=; b=A0LFaYivYdtzVx8G3fHinFJQg4IaiTDfD3X9tQBZGhNxTJDW30cGb61DHMFIlVjolN COr3aRbbf06vjUJwAFrFqcl/5Qi/gD5C7LZtT0zc6IrvnJQh1XR222LJZIV71I3BiCAC 5GrpN+yzDQGpvkILOiHh66GvTNMn2vZXsCPlD1v/gcGz8z3OzM0ZQgVJkaIk8q3QQhz4 3F2ns4S1RD8mn/cDR6caG/jGTEAQ2hpgxkp4i8m9THoj2gcq7t0nQx0En4hj6QDP8mC+ cmtcgPUoPq+J/5FTLW3vlgkF2buKw6W03Xnrvc8H5w7xoZLbARfURBGzfCNGq8ICi9X8 ka9g== X-Forwarded-Encrypted: i=1; AJvYcCUrKlKo+qdshaAVv7gBe9MH+sXYdE5PM5vq+K7ViCn0c2mOdk1LBebOL2oKNBVuuFby881FwA3asVIBUqM=@vger.kernel.org X-Gm-Message-State: AOJu0YwYKoUeGMRb+208UWLXTi1jzzWgE1Lew0QvGdDLO1jOLO2oF871 KqVS603VItaerbLbcIXm3NwGdMGSCHe6lEz5jbQDdyFjvDuxzp7jSdJMscnry9zwNF2XHs8oB3g = X-Gm-Gg: ASbGncubiDoVZih5My486NzbOZyL19J7xsaFWiVnU1bZnWcYnx/Q2QcqOS7kAx6HsL0 MhprpgOOQD1jtxgwnIYMNrwQQx5U6d9yuTAut2uIbr97Yp7fheQx4mXPBykRU3o9GCE3VNZqU+D uhJmQQsKkcoN6wtSbxQZUAcyeRNfirv4Kr/nIduNo+1jLJfmyia0F8KJtboHSVA9kykuuEPAqM0 KpmDrCo3Dc+2UmTk60ZSbeA4XAHEGLBZviMJF5Zt/aaMasqWrW8ijQQL8QqZZTUZUtX9ds= X-Google-Smtp-Source: AGHT+IHryHek2XRVYS94YH2r4x03SqrwmBMFwfNHTimqb3KpUJr+MKVD5jT0i5y4nF7OMpy8M9x55A== X-Received: by 2002:a05:6808:2205:b0:3e7:60b1:1f49 with SMTP id 5614622812f47-3e9157a1595mr1527992b6e.4.1732247256800; Thu, 21 Nov 2024 19:47:36 -0800 (PST) Received: from lschyi-p920.tpe.corp.google.com ([2401:fa00:1:10:533e:26bf:b63:973a]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-724de554b11sm550174b3a.133.2024.11.21.19.47.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Nov 2024 19:47:36 -0800 (PST) From: Sung-Chi Li Date: Fri, 22 Nov 2024 11:47:21 +0800 Subject: [PATCH 1/2] power: supply: cros_usbpd-charger: extend as a thermal of cooling device 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 Message-Id: <20241122-extend_power_limit-v1-1-a3ecd87afa76@chromium.org> References: <20241122-extend_power_limit-v1-0-a3ecd87afa76@chromium.org> In-Reply-To: <20241122-extend_power_limit-v1-0-a3ecd87afa76@chromium.org> To: Benson Leung , Guenter Roeck , Sebastian Reichel , Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: chrome-platform@lists.linux.dev, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Sung-Chi Li X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1732247251; l=5457; i=lschyi@chromium.org; s=20241113; h=from:subject:message-id; bh=0NAcyLrHHDhRn82WN0izrFPbVZrkw97X7FSs9cPtqXA=; b=5RorBRojsc5DW6lyjii3KCfqlhvUkvwWPGbGmaVKEbwGjzsUje+27mQCbi8dCQMkBIUiTJa7T qCyOSvMN0GDAcumVzpM//xx+QPNcqSTpAAZ42bBWRr5S0yxWN39oTIi X-Developer-Key: i=lschyi@chromium.org; a=ed25519; pk=nE3PJlqSK35GdWfB4oVLOwi4njfaUZRhM66HGos9P6o= cros_usbpd-charger is the driver that takes care the system input power from the pd charger. This driver also exposes the functionality to limit input current. We can extend this driver to make it as a passive thermal cooling device by limiting the input current. As such, this commit implements the required cooling methods and OF style registration. Signed-off-by: Sung-Chi Li --- drivers/power/supply/cros_usbpd-charger.c | 98 +++++++++++++++++++++++++++= ++-- 1 file changed, 93 insertions(+), 5 deletions(-) diff --git a/drivers/power/supply/cros_usbpd-charger.c b/drivers/power/supp= ly/cros_usbpd-charger.c index 47d3f58aa15c..a0451630cdd7 100644 --- a/drivers/power/supply/cros_usbpd-charger.c +++ b/drivers/power/supply/cros_usbpd-charger.c @@ -13,6 +13,9 @@ #include #include #include +#ifdef CONFIG_THERMAL_OF +#include +#endif /* CONFIG_THERMAL_OF */ =20 #define CHARGER_USBPD_DIR_NAME "CROS_USBPD_CHARGER%d" #define CHARGER_DEDICATED_DIR_NAME "CROS_DEDICATED_CHARGER" @@ -22,6 +25,7 @@ sizeof(CHARGER_DEDICATED_DIR_NAME)) #define CHARGER_CACHE_UPDATE_DELAY msecs_to_jiffies(500) #define CHARGER_MANUFACTURER_MODEL_LENGTH 32 +#define CHARGER_COOLING_INTERVALS 10 =20 #define DRV_NAME "cros-usbpd-charger" =20 @@ -76,6 +80,8 @@ static enum power_supply_property cros_usbpd_dedicated_ch= arger_props[] =3D { /* Input voltage/current limit in mV/mA. Default to none. */ static u16 input_voltage_limit =3D EC_POWER_LIMIT_NONE; static u16 input_current_limit =3D EC_POWER_LIMIT_NONE; +/* Cooling level interns of current limit */ +static u16 input_current_cooling_level; =20 static bool cros_usbpd_charger_port_is_dedicated(struct port_data *port) { @@ -459,13 +465,20 @@ static int cros_usbpd_charger_set_prop(struct power_s= upply *psy, break; =20 input_current_limit =3D intval; - if (input_current_limit =3D=3D EC_POWER_LIMIT_NONE) + if (input_current_limit =3D=3D EC_POWER_LIMIT_NONE) { dev_info(dev, "External Current Limit cleared for all ports\n"); - else - dev_info(dev, - "External Current Limit set to %dmA for all ports\n", - input_current_limit); + input_current_cooling_level =3D 0; + } else { + dev_info( + dev, + "External Current Limit set to %dmA for all ports\n", + input_current_limit); + input_current_cooling_level =3D + input_current_limit * + CHARGER_COOLING_INTERVALS / + port->psy_current_max; + } break; case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT: ret =3D cros_usbpd_charger_set_ext_power_limit(charger, @@ -525,6 +538,66 @@ static void cros_usbpd_charger_unregister_notifier(voi= d *data) cros_usbpd_unregister_notify(&charger->notifier); } =20 +#ifdef CONFIG_THERMAL_OF +static int +cros_usbpd_charger_get_max_cooling_state(struct thermal_cooling_device *cd= ev, + unsigned long *cooling_level) +{ + *cooling_level =3D CHARGER_COOLING_INTERVALS; + return 0; +} + +static int +cros_usbpd_charger_get_cur_cooling_state(struct thermal_cooling_device *cd= ev, + unsigned long *cooling_level) +{ + *cooling_level =3D input_current_cooling_level; + return 0; +} + +static int +cros_usbpd_charger_set_cur_cooling_state(struct thermal_cooling_device *cd= ev, + unsigned long cooling_level) +{ + struct charger_data *charger =3D cdev->devdata; + struct port_data *port; + int current_limit; + int idx =3D -1; + int ret; + + for (int i =3D 0; i < charger->num_registered_psy; i++) { + port =3D charger->ports[i]; + if (port->psy_status =3D=3D POWER_SUPPLY_STATUS_CHARGING) { + idx =3D i; + break; + } + } + + if (idx =3D=3D -1) + return -EINVAL; + + current_limit =3D + port->psy_current_max - (cooling_level * port->psy_current_max / + CHARGER_COOLING_INTERVALS); + ret =3D cros_usbpd_charger_set_ext_power_limit(charger, current_limit, + input_voltage_limit); + if (ret < 0) + return ret; + + input_current_limit =3D (current_limit =3D=3D port->psy_current_max) ? + EC_POWER_LIMIT_NONE : + current_limit; + input_current_cooling_level =3D cooling_level; + return 0; +} + +static struct thermal_cooling_device_ops cros_usbpd_charger_cooling_ops = =3D { + .get_max_state =3D cros_usbpd_charger_get_max_cooling_state, + .get_cur_state =3D cros_usbpd_charger_get_cur_cooling_state, + .set_cur_state =3D cros_usbpd_charger_set_cur_cooling_state, +}; +#endif /* CONFIG_THERMAL_OF */ + static int cros_usbpd_charger_probe(struct platform_device *pd) { struct cros_ec_dev *ec_dev =3D dev_get_drvdata(pd->dev.parent); @@ -534,6 +607,9 @@ static int cros_usbpd_charger_probe(struct platform_dev= ice *pd) struct charger_data *charger; struct power_supply *psy; struct port_data *port; +#ifdef CONFIG_THERMAL_OF + struct thermal_cooling_device *cdev; +#endif /* CONFIG_THERMAL_OF */ int ret =3D -EINVAL; int i; =20 @@ -674,6 +750,18 @@ static int cros_usbpd_charger_probe(struct platform_de= vice *pd) goto fail; } =20 +#ifdef CONFIG_THERMAL_OF + cdev =3D devm_thermal_of_cooling_device_register( + dev, ec_device->dev->of_node, DRV_NAME, charger, + &cros_usbpd_charger_cooling_ops); + if (IS_ERR(cdev)) { + dev_err(dev, + "Failing register thermal cooling device (err:%pe)\n", + cdev); + goto fail; + } +#endif /* CONFIG_THERMAL_OF */ + return 0; =20 fail: --=20 2.47.0.371.ga323438b13-goog