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ACPI: add support for configfs

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Register the ACPI subsystem with configfs.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Octavian Purdila 2016-07-08 19:13:13 +03:00 committed by Rafael J. Wysocki
parent 475fb4e8b2
commit 0bf54fcd95
5 changed files with 70 additions and 0 deletions
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7
Documentation/ABI/testing/configfs-acpi Normal file
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@ -0,0 +1,7 @@
What: /config/acpi
Date: July 2016
KernelVersion: 4.8
Contact: linux-acpi@vger.kernel.org
Description:
This represents the ACPI subsystem entry point directory. It
contains sub-groups corresponding to ACPI configurable options.

1
MAINTAINERS
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@ -288,6 +288,7 @@ F: include/linux/acpi.h
F: include/acpi/
F: Documentation/acpi/
F: Documentation/ABI/testing/sysfs-bus-acpi
F: Documentation/ABI/testing/configfs-acpi
F: drivers/pci/*acpi*
F: drivers/pci/*/*acpi*
F: drivers/pci/*/*/*acpi*

8
drivers/acpi/Kconfig
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@ -524,4 +524,12 @@ config XPOWER_PMIC_OPREGION
endif
config ACPI_CONFIGFS
tristate "ACPI configfs support"
select CONFIGFS_FS
help
Select this option to enable support for ACPI configuration from
userspace. The configurable ACPI groups will be visible under
/config/acpi, assuming configfs is mounted under /config.
endif # ACPI

1
drivers/acpi/Makefile
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@ -99,5 +99,6 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o
obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o
obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o
obj-$(CONFIG_ACPI_CONFIGFS) += configfs.o
video-objs += acpi_video.o video_detect.o

53
drivers/acpi/configfs.c Normal file
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@ -0,0 +1,53 @@
/*
* ACPI configfs support
*
* Copyright (c) 2016 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/configfs.h>
#include <linux/acpi.h>
static struct config_item_type acpi_root_group_type = {
.ct_owner = THIS_MODULE,
};
static struct configfs_subsystem acpi_configfs = {
.su_group = {
.cg_item = {
.ci_namebuf = "acpi",
.ci_type = &acpi_root_group_type,
},
},
.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
};
static int __init acpi_configfs_init(void)
{
int ret;
struct config_group *root = &acpi_configfs.su_group;
config_group_init(root);
ret = configfs_register_subsystem(&acpi_configfs);
if (ret)
return ret;
return 0;
}
module_init(acpi_configfs_init);
static void __exit acpi_configfs_exit(void)
{
configfs_unregister_subsystem(&acpi_configfs);
}
module_exit(acpi_configfs_exit);
MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
MODULE_DESCRIPTION("ACPI configfs support");
MODULE_LICENSE("GPL v2");