From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50BBA3F074A; Wed, 22 Apr 2026 19:09:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776884993; cv=none; b=o/5/yplHFj/T45WxlLhtapyJ8XNfCSU0HRAAOZoD1J+4M+YrTwsaZSHEVI6lWi8g0sfz/GQdF/VX/B02bh/zxX7sDhbHG2qG1XOYUcpZIcKzYcYtSr8Ca+N+/llucSEGSEFd0UAjpyqWFzo1rs58/wB6kr6xDec71wV7VFKdZzg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776884993; c=relaxed/simple; bh=Cq9ntGuniLpfxw15CP8xJiYmwt7Mrtt3HRmb0vxAfxs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JUi5Ku5rtta6uSnWt7mL4EgSeq8oonEMJkroD6F+ALktbdcvlggLbGg4TR43YGYPqmMbICa6918Ja5HGnU4/QAhLlL/AJ4MsXz9Fd9oY8kMlgmwrxJma4hmUsYVNyZI9H4Eu4Fqv6LaGEHDQ71DfJRFeQgwCo2nTuGMPTVG9xcY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JcFk5j9i; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JcFk5j9i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 19DB3C19425; Wed, 22 Apr 2026 19:09:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776884989; bh=Cq9ntGuniLpfxw15CP8xJiYmwt7Mrtt3HRmb0vxAfxs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JcFk5j9i5pPz/F6lIHNNSJIqwTbNKUZc9zUfRMAV1apZRit+QYN0WKr+FpgIrZ1Rd AH7eKpMkWyUAVdzRfIz+0tvcelulxE19DxG4vuU83MlNvi5gnIyFGjsa+Y8sYwX2cA OEjQwfKZBrE4MR9qbLJNYRdiU/LXEkJHGp1Y4uXbD2QZjpQyFH1NCp9BscRKS0iG3V 9XulxNrlM2/W84Qg5HJLfq+jfxs6wJYhZE9yJiR2As6zXNapnuK6jvEGpulFlZO5hS AR528ykwd8jj/taje9nLC6NG1XPetesFFeb1Lkeu+1Kr322Bg1dApE926ciQseBmxr HIBGy8M15HZRQ== From: "Rafael J. Wysocki" To: Linux PM Cc: Daniel Lezcano , LKML , Lukasz Luba , Armin Wolf , Jiajia Liu , Marc Zyngier , Enric Balletbo i Serra , linux-hwmon@vger.kernel.org, Guenter Roeck Subject: [PATCH v1 2/2] thermal: hwmon: Use extra_groups for adding temperature attributes Date: Wed, 22 Apr 2026 21:09:33 +0200 Message-ID: <2267033.irdbgypaU6@rafael.j.wysocki> Organization: Linux Kernel Development In-Reply-To: <5100596.31r3eYUQgx@rafael.j.wysocki> References: <5100596.31r3eYUQgx@rafael.j.wysocki> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="UTF-8" From: Rafael J. Wysocki Instead of passing NULL as the last argument to __hwmon_device_register() in hwmon_device_register_for_thermal() and then adding each temperature sysfs attribute to the hwmon device via device_create_file(), redefine hwmon_device_register_for_thermal() to take an extra_groups argument that will be passed to __hwmon_device_register(), define an attribute group with a proper .is_visible() callback for the temperature attributes and a related attribute groups pointer, and pass the latter to hwmon_device_register_for_thermal(). This causes the code to be way more straightforward and closer to what the other users of the hwmon subsystem do. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/hwmon/hwmon.c | 6 +- drivers/thermal/thermal_hwmon.c | 112 ++++++++++++++++------------------------ include/linux/hwmon.h | 3 - 3 files changed, 51 insertions(+), 70 deletions(-) --- a/drivers/hwmon/hwmon.c +++ b/drivers/hwmon/hwmon.c @@ -1081,6 +1081,7 @@ EXPORT_SYMBOL_GPL(hwmon_device_register_ * @dev: the parent device * @name: hwmon name attribute * @drvdata: driver data to attach to created device + * @extra_groups: pointer to list of additional non-standard attribute groups * * The use of this function is restricted. It is provided for legacy reasons * and must only be called from the thermal subsystem. @@ -1092,12 +1093,13 @@ EXPORT_SYMBOL_GPL(hwmon_device_register_ */ struct device * hwmon_device_register_for_thermal(struct device *dev, const char *name, - void *drvdata) + void *drvdata, + const struct attribute_group **extra_groups) { if (!name || !dev) return ERR_PTR(-EINVAL); - return __hwmon_device_register(dev, name, drvdata, NULL, NULL); + return __hwmon_device_register(dev, name, drvdata, NULL, extra_groups); } EXPORT_SYMBOL_NS_GPL(hwmon_device_register_for_thermal, "HWMON_THERMAL"); --- a/drivers/thermal/thermal_hwmon.c +++ b/drivers/thermal/thermal_hwmon.c @@ -19,16 +19,12 @@ #include "thermal_hwmon.h" #include "thermal_core.h" -struct thermal_hwmon_attr { - struct device_attribute attr; -}; - /* one temperature input for each thermal zone */ struct thermal_hwmon_temp { struct list_head hwmon_node; struct thermal_zone_device *tz; - struct thermal_hwmon_attr temp_input; /* hwmon sys attr */ - struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */ + struct device_attribute temp_input; /* hwmon sys attr */ + struct device_attribute temp_crit; /* hwmon sys attr */ }; /* hwmon sys I/F */ @@ -45,19 +41,14 @@ static LIST_HEAD(thermal_hwmon_list); static DEFINE_MUTEX(thermal_hwmon_list_lock); static ssize_t -temp_input_show(struct device *dev, struct device_attribute *attr, char *buf) +temp1_input_show(struct device *dev, struct device_attribute *attr, char *buf) { + struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev); + struct thermal_zone_device *tz = hwmon->tz_temp.tz; int temperature; int ret; - struct thermal_hwmon_attr *hwmon_attr - = container_of(attr, struct thermal_hwmon_attr, attr); - struct thermal_hwmon_temp *temp - = container_of(hwmon_attr, struct thermal_hwmon_temp, - temp_input); - struct thermal_zone_device *tz = temp->tz; ret = thermal_zone_get_temp(tz, &temperature); - if (ret) return ret; @@ -65,14 +56,10 @@ temp_input_show(struct device *dev, stru } static ssize_t -temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf) +temp1_crit_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct thermal_hwmon_attr *hwmon_attr - = container_of(attr, struct thermal_hwmon_attr, attr); - struct thermal_hwmon_temp *temp - = container_of(hwmon_attr, struct thermal_hwmon_temp, - temp_crit); - struct thermal_zone_device *tz = temp->tz; + struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev); + struct thermal_zone_device *tz = hwmon->tz_temp.tz; int temperature; int ret; @@ -85,22 +72,49 @@ temp_crit_show(struct device *dev, struc return sysfs_emit(buf, "%d\n", temperature); } -static bool thermal_zone_crit_temp_valid(struct thermal_zone_device *tz) +static DEVICE_ATTR_RO(temp1_input); +static DEVICE_ATTR_RO(temp1_crit); + +static struct attribute *thermal_hwmon_attrs[] = { + &dev_attr_temp1_input.attr, + &dev_attr_temp1_crit.attr, + NULL, +}; + +static umode_t thermal_hwmon_attr_is_visible(struct kobject *kobj, + struct attribute *a, int n) { - int temp; - return tz->ops.get_crit_temp && !tz->ops.get_crit_temp(tz, &temp); + if (a == &dev_attr_temp1_input.attr) + return a->mode; + + if (a == &dev_attr_temp1_crit.attr) { + struct thermal_hwmon_device *hwmon = dev_get_drvdata(kobj_to_dev(kobj)); + struct thermal_zone_device *tz = hwmon->tz_temp.tz; + int dummy; + + if (tz->ops.get_crit_temp && !tz->ops.get_crit_temp(tz, &dummy)) + return a->mode; + } + + return 0; } +static const struct attribute_group thermal_hwmon_group = { + .attrs = thermal_hwmon_attrs, + .is_visible = thermal_hwmon_attr_is_visible, +}; + +__ATTRIBUTE_GROUPS(thermal_hwmon); + int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) { struct thermal_hwmon_device *hwmon; - struct thermal_hwmon_temp *temp; - int result; hwmon = kzalloc_obj(*hwmon); if (!hwmon) return -ENOMEM; + hwmon->tz_temp.tz = tz; /* * Append the thermal zone ID preceded by an underline character to the * type to disambiguate the sensors command output. @@ -108,33 +122,13 @@ int thermal_add_hwmon_sysfs(struct therm scnprintf(hwmon->type, THERMAL_NAME_LENGTH, "%s_%d", tz->type, tz->id); strreplace(hwmon->type, '-', '_'); hwmon->device = hwmon_device_register_for_thermal(&tz->device, - hwmon->type, hwmon); + hwmon->type, hwmon, + thermal_hwmon_groups); if (IS_ERR(hwmon->device)) { - result = PTR_ERR(hwmon->device); - goto free_mem; - } + int result = PTR_ERR(hwmon->device); - temp = &hwmon->tz_temp; - - temp->tz = tz; - - temp->temp_input.attr.attr.name = "temp1_input"; - temp->temp_input.attr.attr.mode = 0444; - temp->temp_input.attr.show = temp_input_show; - sysfs_attr_init(&temp->temp_input.attr.attr); - result = device_create_file(hwmon->device, &temp->temp_input.attr); - if (result) - goto unregister_name; - - if (thermal_zone_crit_temp_valid(tz)) { - temp->temp_crit.attr.attr.name = "temp1_crit"; - temp->temp_crit.attr.attr.mode = 0444; - temp->temp_crit.attr.show = temp_crit_show; - sysfs_attr_init(&temp->temp_crit.attr.attr); - result = device_create_file(hwmon->device, - &temp->temp_crit.attr); - if (result) - goto unregister_input; + kfree(hwmon); + return result; } /* The list is needed for hwmon lookup during removal. */ @@ -143,15 +137,6 @@ int thermal_add_hwmon_sysfs(struct therm } return 0; - - unregister_input: - device_remove_file(hwmon->device, &temp->temp_input.attr); - unregister_name: - hwmon_device_unregister(hwmon->device); - free_mem: - kfree(hwmon); - - return result; } EXPORT_SYMBOL_GPL(thermal_add_hwmon_sysfs); @@ -170,7 +155,6 @@ thermal_hwmon_lookup(const struct therma void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) { struct thermal_hwmon_device *hwmon; - struct thermal_hwmon_temp *temp; scoped_guard(mutex, &thermal_hwmon_list_lock) { hwmon = thermal_hwmon_lookup(tz); @@ -180,12 +164,6 @@ void thermal_remove_hwmon_sysfs(struct t list_del(&hwmon->node); } - temp = &hwmon->tz_temp; - - device_remove_file(hwmon->device, &temp->temp_input.attr); - if (thermal_zone_crit_temp_valid(tz)) - device_remove_file(hwmon->device, &temp->temp_crit.attr); - hwmon_device_unregister(hwmon->device); kfree(hwmon); } --- a/include/linux/hwmon.h +++ b/include/linux/hwmon.h @@ -477,7 +477,8 @@ hwmon_device_register_with_info(struct d const struct attribute_group **extra_groups); struct device * hwmon_device_register_for_thermal(struct device *dev, const char *name, - void *drvdata); + void *drvdata, + const struct attribute_group **extra_groups); struct device * devm_hwmon_device_register_with_info(struct device *dev, const char *name, void *drvdata,