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Message-ID: <20241105153316.378-10-mario.limonciello@amd.com>
Date: Tue, 5 Nov 2024 09:33:05 -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 09/20] ACPI: platform_profile: Create class for ACPI platform profile
When registering a platform profile handler create a class device
that will allow changing a single platform profile handler.
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
drivers/acpi/platform_profile.c | 42 +++++++++++++++++++++++++++++---
include/linux/platform_profile.h | 2 ++
2 files changed, 41 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index fd1c4e9dccf0a..f8e9dc9a10d54 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -5,6 +5,7 @@
#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/init.h>
+#include <linux/kdev_t.h>
#include <linux/mutex.h>
#include <linux/platform_profile.h>
#include <linux/sysfs.h>
@@ -22,6 +23,12 @@ static const char * const profile_names[] = {
};
static_assert(ARRAY_SIZE(profile_names) == PLATFORM_PROFILE_LAST);
+static DEFINE_IDR(platform_profile_minor_idr);
+
+static const struct class platform_profile_class = {
+ .name = "platform-profile",
+};
+
static ssize_t platform_profile_choices_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -113,6 +120,8 @@ void platform_profile_notify(void)
{
if (!cur_profile)
return;
+ if (!class_is_registered(&platform_profile_class))
+ return;
sysfs_notify(acpi_kobj, NULL, "platform_profile");
}
EXPORT_SYMBOL_GPL(platform_profile_notify);
@@ -123,6 +132,9 @@ int platform_profile_cycle(void)
enum platform_profile_option next;
int err;
+ if (!class_is_registered(&platform_profile_class))
+ return -ENODEV;
+
scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
if (!cur_profile)
return -ENODEV;
@@ -167,12 +179,33 @@ int platform_profile_register(struct platform_profile_handler *pprof)
if (cur_profile)
return -EEXIST;
- err = sysfs_create_group(acpi_kobj, &platform_profile_group);
- if (err)
- return err;
+ if (!class_is_registered(&platform_profile_class)) {
+ /* class for individual handlers */
+ err = class_register(&platform_profile_class);
+ if (err)
+ return err;
+ /* legacy sysfs files */
+ err = sysfs_create_group(acpi_kobj, &platform_profile_group);
+ if (err)
+ goto cleanup_class;
+ }
+
+ /* create class interface for individual handler */
+ pprof->minor = idr_alloc(&platform_profile_minor_idr, pprof, 0, 0, GFP_KERNEL);
+ pprof->class_dev = device_create(&platform_profile_class, pprof->dev,
+ MKDEV(0, pprof->minor), NULL, "platform-profile-%d",
+ pprof->minor);
+ if (IS_ERR(pprof->class_dev))
+ return PTR_ERR(pprof->class_dev);
+ dev_set_drvdata(pprof->class_dev, pprof);
cur_profile = pprof;
return 0;
+
+cleanup_class:
+ class_unregister(&platform_profile_class);
+
+ return err;
}
EXPORT_SYMBOL_GPL(platform_profile_register);
@@ -181,6 +214,9 @@ int platform_profile_remove(struct platform_profile_handler *pprof)
guard(mutex)(&profile_lock);
sysfs_remove_group(acpi_kobj, &platform_profile_group);
+
+ device_destroy(&platform_profile_class, MKDEV(0, pprof->minor));
+
cur_profile = NULL;
return 0;
}
diff --git a/include/linux/platform_profile.h b/include/linux/platform_profile.h
index bcaf3aa39160f..f81c3afcb7575 100644
--- a/include/linux/platform_profile.h
+++ b/include/linux/platform_profile.h
@@ -29,6 +29,8 @@ enum platform_profile_option {
struct platform_profile_handler {
const char *name;
struct device *dev;
+ struct device *class_dev;
+ int minor;
unsigned long choices[BITS_TO_LONGS(PLATFORM_PROFILE_LAST)];
int (*profile_get)(struct platform_profile_handler *pprof,
enum platform_profile_option *profile);
--
2.43.0
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