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Message-ID: <20241105153316.378-13-mario.limonciello@amd.com>
Date: Tue, 5 Nov 2024 09:33:08 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Hans de Goede <hdegoede@...hat.com>, Ilpo Järvinen
<ilpo.jarvinen@...ux.intel.com>
CC: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
Maximilian Luz <luzmaximilian@...il.com>, Lee Chun-Yi <jlee@...e.com>, "Shyam
Sundar S K" <Shyam-sundar.S-k@....com>, Corentin Chary
<corentin.chary@...il.com>, "Luke D . Jones" <luke@...nes.dev>, Ike Panhc
<ike.pan@...onical.com>, Henrique de Moraes Holschuh <hmh@....eng.br>,
"Alexis Belmonte" <alexbelm48@...il.com>, Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>, Ai Chao <aichao@...inos.cn>, Gergo Koteles
<soyer@....hu>, open list <linux-kernel@...r.kernel.org>, "open list:ACPI"
<linux-acpi@...r.kernel.org>, "open list:MICROSOFT SURFACE PLATFORM PROFILE
DRIVER" <platform-driver-x86@...r.kernel.org>, "open list:THINKPAD ACPI
EXTRAS DRIVER" <ibm-acpi-devel@...ts.sourceforge.net>, Mark Pearson
<mpearson-lenovo@...ebb.ca>, Matthew Schwartz <matthew.schwartz@...ux.dev>,
Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v4 12/20] ACPI: platform_profile: Add profile attribute for class interface
Reading and writing the `profile` sysfs file will use the callbacks for
the platform profile handler to read or set the given profile.
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
drivers/acpi/platform_profile.c | 118 ++++++++++++++++++++++++++++++++
1 file changed, 118 insertions(+)
diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index e1b6569c4ee70..79083d0bb22e3 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -65,6 +65,78 @@ static int _get_class_choices(struct device *dev, unsigned long *choices)
return 0;
}
+/**
+ * _store_class_profile - Set the profile for a class device
+ * @dev: The class device
+ * @data: The profile to set
+ */
+static int _store_class_profile(struct device *dev, void *data)
+{
+ enum platform_profile_option profile;
+ unsigned long choices;
+ int *i = (int *)data;
+ int err;
+
+ err = _get_class_choices(dev, &choices);
+ if (err)
+ return err;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
+ struct platform_profile_handler *handler;
+
+ if (!test_bit(*i, &choices))
+ return -EOPNOTSUPP;
+
+ handler = dev_get_drvdata(dev);
+ err = handler->profile_get(handler, &profile);
+ if (err)
+ return err;
+
+ err = handler->profile_set(handler, *i);
+ if (err) {
+ int recover_err;
+
+ dev_err(dev, "Failed to set profile: %d\n", err);
+ recover_err = handler->profile_set(handler, profile);
+ if (recover_err)
+ dev_err(dev, "Failed to reset profile: %d\n", recover_err);
+ }
+ sysfs_notify(&handler->class_dev->kobj, NULL, "platform_profile");
+ kobject_uevent(&handler->class_dev->kobj, KOBJ_CHANGE);
+ }
+
+ sysfs_notify(acpi_kobj, NULL, "platform_profile");
+ return err ? err : 0;
+}
+
+/**
+ * get_class_profile - Show the current profile for a class device
+ * @dev: The class device
+ * @profile: The profile to return
+ * Return: 0 on success, -errno on failure
+ */
+static int get_class_profile(struct device *dev,
+ enum platform_profile_option *profile)
+{
+ struct platform_profile_handler *handler;
+ enum platform_profile_option val;
+ int err;
+
+ scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
+ handler = dev_get_drvdata(dev);
+ err = handler->profile_get(handler, &val);
+ if (err) {
+ pr_err("Failed to get profile for handler %s\n", handler->name);
+ return err;
+ }
+ }
+
+ if (WARN_ON(val >= PLATFORM_PROFILE_LAST))
+ return -EINVAL;
+ *profile = val;
+
+ return 0;
+}
/**
* name_show - Show the name of the profile handler
@@ -102,12 +174,58 @@ static ssize_t choices_show(struct device *dev,
return _commmon_choices_show(choices, buf);
}
+/**
+ * profile_show - Show the current profile for a class device
+ * @dev: The device
+ * @attr: The attribute
+ * @buf: The buffer to write to
+ * Return: The number of bytes written
+ */
+static ssize_t profile_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ enum platform_profile_option profile = PLATFORM_PROFILE_LAST;
+ int err;
+
+ err = get_class_profile(dev, &profile);
+ if (err)
+ return err;
+
+ return sysfs_emit(buf, "%s\n", profile_names[profile]);
+}
+
+/**
+ * profile_store - Set the profile for a class device
+ * @dev: The device
+ * @attr: The attribute
+ * @buf: The buffer to read from
+ * @count: The number of bytes to read
+ * Return: The number of bytes read
+ */
+static ssize_t profile_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int i, ret;
+
+ i = sysfs_match_string(profile_names, buf);
+ if (i < 0)
+ return -EINVAL;
+
+ ret = _store_class_profile(dev, (void *)(long)&i);
+
+ return ret ? ret : count;
+}
static DEVICE_ATTR_RO(name);
static DEVICE_ATTR_RO(choices);
+static DEVICE_ATTR_RW(profile);
+
static struct attribute *profile_attrs[] = {
&dev_attr_name.attr,
&dev_attr_choices.attr,
+ &dev_attr_profile.attr,
NULL
};
ATTRIBUTE_GROUPS(profile);
--
2.43.0
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