This is the initial implementation of the platform-profile feature. It provides the details discussed and outlined in the sysfs-platform_profile document. Many modern systems have the ability to modify the operating profile to control aspects like fan speed, temperature and power levels. This module provides a common sysfs interface that platform modules can register against to control their individual profile options. Signed-off-by: Mark Pearson <markpearson@xxxxxxxxxx> --- MAINTAINERS | 8 ++ drivers/acpi/Kconfig | 19 ++++ drivers/acpi/Makefile | 1 + drivers/acpi/platform_profile.c | 172 +++++++++++++++++++++++++++++++ include/linux/platform_profile.h | 36 +++++++ 5 files changed, 236 insertions(+) create mode 100644 drivers/acpi/platform_profile.c create mode 100644 include/linux/platform_profile.h diff --git a/MAINTAINERS b/MAINTAINERS index 9a54806ebf02..e731ac1c4447 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -436,6 +436,14 @@ S: Orphan F: drivers/platform/x86/wmi.c F: include/uapi/linux/wmi.h +ACPI PLATFORM PROFILE DRIVER +M: Mark Pearson <markpearons@xxxxxxxxxx> +L: linux-acpi@xxxxxxxxxxxxxxx +S: Supported +W: https://01.org/linux-acpi +B: https://bugzilla.kernel.org +F: drivers/acpi/platform_profile.c + AD1889 ALSA SOUND DRIVER L: linux-parisc@xxxxxxxxxxxxxxx S: Maintained diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 7540a5179a47..b10a8e0863cf 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -601,3 +601,22 @@ config X86_PM_TIMER You should nearly always say Y here because many modern systems require this timer. + +config ACPI_PLATFORM_PROFILE + tristate "ACPI Platform Profile Driver" + default y + help + This driver adds support for platform-profiles on platforms that + support it. + + Platform-profiles can be used to control the platform behaviour. For + example whether to operate in a lower power mode, in a higher + power performance mode or between the two. + + This driver provides the sysfs interface and is used as the registration + point for platform specific drivers. + + Which profiles are supported is determined on a per-platform basis and + should be obtained from the platform specific driver. + + diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 9a957544e357..82dbdc0300ed 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -93,6 +93,7 @@ obj-$(CONFIG_ACPI_CPPC_LIB) += cppc_acpi.o obj-$(CONFIG_ACPI_SPCR_TABLE) += spcr.o obj-$(CONFIG_ACPI_DEBUGGER_USER) += acpi_dbg.o obj-$(CONFIG_ACPI_PPTT) += pptt.o +obj-$(CONFIG_ACPI_PLATFORM_PROFILE) += platform_profile.o # processor has its own "processor." module_param namespace processor-y := processor_driver.o diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c new file mode 100644 index 000000000000..3c460c0a3857 --- /dev/null +++ b/drivers/acpi/platform_profile.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +/* + * platform_profile.c - Platform profile sysfs interface + */ + +#include <linux/module.h> +#include <linux/printk.h> +#include <linux/kobject.h> +#include <linux/sysfs.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/string.h> +#include <linux/device.h> +#include <linux/acpi.h> +#include <linux/mutex.h> +#include <acpi/acpi_bus.h> +#include <linux/platform_profile.h> + +struct platform_profile *cur_profile; +DEFINE_MUTEX(profile_lock); + +/* Ensure the first char of each profile is unique */ +static char *profile_str[] = { + "Low-power", + "Cool", + "Quiet", + "Balance", + "Performance", + "Unknown" +}; + +static ssize_t platform_profile_choices_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int i; + int ret, count = 0; + + mutex_lock(&profile_lock); + if (!cur_profile) { + mutex_unlock(&profile_lock); + return -ENODEV; + } + + if (!cur_profile->choices) { + mutex_unlock(&profile_lock); + return snprintf(buf, PAGE_SIZE, "None"); + } + + for (i = profile_low; i < profile_unknown; i++) { + if (cur_profile->choices & (1 << i)) { + ret = snprintf(buf+count, PAGE_SIZE, "%s ", profile_str[i]); + if (ret < 0) + break; + count += ret; + } + } + mutex_unlock(&profile_lock); + return count; +} + +static ssize_t platform_profile_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + enum profile_option profile = profile_unknown; + + mutex_lock(&profile_lock); + if (!cur_profile) { + mutex_unlock(&profile_lock); + return -ENODEV; + } + if (cur_profile->profile_get) + profile = cur_profile->profile_get(); + mutex_unlock(&profile_lock); + + return snprintf(buf, PAGE_SIZE, "%s", profile_str[profile]); +} + +static ssize_t platform_profile_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + enum profile_option profile; + + mutex_lock(&profile_lock); + if (!cur_profile) { + mutex_unlock(&profile_lock); + return -ENODEV; + } + + /* Scan for a matching profile */ + for (profile = profile_low; profile < profile_unknown; profile++) { + if (toupper(buf[0]) == profile_str[profile][0]) + break; + } + if (profile == profile_unknown) { + mutex_unlock(&profile_lock); + return -EINVAL; + } + + if (cur_profile->profile_set) + cur_profile->profile_set(profile); + + mutex_unlock(&profile_lock); + return count; +} + +static DEVICE_ATTR_RO(platform_profile_choices); +static DEVICE_ATTR_RW(platform_profile); + +static struct attribute *platform_profile_attributes[] = { + &dev_attr_platform_profile_choices.attr, + &dev_attr_platform_profile.attr, + NULL, +}; + +static const struct attribute_group platform_profile_attr_group = { + .attrs = platform_profile_attributes, +}; + +int platform_profile_notify(void) +{ + if (!cur_profile) + return -ENODEV; + sysfs_notify(acpi_kobj, NULL, "platform_profile"); + return 0; +} +EXPORT_SYMBOL_GPL(platform_profile_notify); + +int platform_profile_register(struct platform_profile *pprof) +{ + mutex_lock(&profile_lock); + /* We can only have one active profile */ + if (cur_profile) { + mutex_unlock(&profile_lock); + return -EEXIST; + } + cur_profile = pprof; + mutex_unlock(&profile_lock); + return sysfs_create_group(acpi_kobj, &platform_profile_attr_group); +} +EXPORT_SYMBOL_GPL(platform_profile_register); + +int platform_profile_unregister(void) +{ + mutex_lock(&profile_lock); + sysfs_remove_group(acpi_kobj, &platform_profile_attr_group); + cur_profile = NULL; + mutex_unlock(&profile_lock); + return 0; +} +EXPORT_SYMBOL_GPL(platform_profile_unregister); + +static int __init platform_profile_init(void) +{ + cur_profile = NULL; + return 0; +} + +static void platform_profile_exit(void) +{ + sysfs_remove_group(acpi_kobj, &platform_profile_attr_group); + cur_profile = NULL; +} + +MODULE_AUTHOR("Mark Pearson <markpearson@xxxxxxxxxx>"); +MODULE_LICENSE("GPL"); + +module_init(platform_profile_init); +module_exit(platform_profile_exit); diff --git a/include/linux/platform_profile.h b/include/linux/platform_profile.h new file mode 100644 index 000000000000..347a12172c09 --- /dev/null +++ b/include/linux/platform_profile.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * platform_profile.h - platform profile sysfs interface + * + * See Documentation/ABI/testing/sysfs-platform_profile for more information. + */ + +#ifndef _PLATFORM_PROFILE_H_ +#define _PLATFORM_PROFILE_H_ + +/* + * If more options are added please update profile_str + * array in platform-profile.c + */ + +enum profile_option { + profile_low, + profile_cool, + profile_quiet, + profile_balance, + profile_perform, + profile_unknown /* Must always be last */ +}; + +struct platform_profile { + unsigned int choices; /* bitmap of available choices */ + int cur_profile; /* Current active profile */ + int (*profile_get)(void); + int (*profile_set)(int profile); +}; + +extern int platform_profile_register(struct platform_profile *pprof); +extern int platform_profile_unregister(void); +extern int platform_profile_notify(void); + +#endif /*_PLATFORM_PROFILE_H_*/ -- 2.28.0
