Commit 17b707fe authored by Mark Pearson's avatar Mark Pearson Committed by Hans de Goede
Browse files

platform/x86: firmware_attributes_class: Create helper file for handling... 


platform/x86: firmware_attributes_class: Create helper file for handling firmware-attributes class registration events

This offers shared code for registering the firmware_attributes_class,
which is used by the Dell and Lenovo WMI management drivers.

Reported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarMark Pearson <markpearson@lenovo.com>
Link: https://lore.kernel.org/r/20210530223111.25929-1-markpearson@lenovo.com


Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 6cbaee2e

drivers/platform/x86/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -1077,6 +1077,10 @@ config TOUCHSCREEN_DMI 
	  the OS-image for the device. This option supplies the missing info.

	  Enable this for x86 tablets with Silead or Chipone touchscreens.



config FW_ATTR_CLASS

	tristate

	default n



config INTEL_IMR

	bool "Intel Isolated Memory Region support"

	depends on X86_INTEL_QUARK && IOSF_MBI

drivers/platform/x86/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -111,6 +111,7 @@ obj-$(CONFIG_SYSTEM76_ACPI) += system76_acpi.o 
obj-$(CONFIG_TOPSTAR_LAPTOP)	+= topstar-laptop.o



# Platform drivers

obj-$(CONFIG_FW_ATTR_CLASS)		+= firmware_attributes_class.o

obj-$(CONFIG_I2C_MULTI_INSTANTIATE)	+= i2c-multi-instantiate.o

obj-$(CONFIG_MLX_PLATFORM)		+= mlx-platform.o

obj-$(CONFIG_TOUCHSCREEN_DMI)		+= touchscreen_dmi.o

drivers/platform/x86/firmware_attributes_class.c

0 → 100644
+52 −0
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// SPDX-License-Identifier: GPL-2.0-or-later



/* Firmware attributes class helper module */



#include <linux/mutex.h>

#include <linux/device/class.h>

#include <linux/module.h>

#include "firmware_attributes_class.h"



static DEFINE_MUTEX(fw_attr_lock);

int fw_attr_inuse;



static struct class firmware_attributes_class = {

	.name = "firmware-attributes",

};



int fw_attributes_class_get(struct class **fw_attr_class)

{

	int err;



	mutex_lock(&fw_attr_lock);

	if (!fw_attr_inuse) { /*first time class is being used*/

		err = class_register(&firmware_attributes_class);

		if (err) {

			mutex_unlock(&fw_attr_lock);

			return err;

		}

	}

	fw_attr_inuse++;

	*fw_attr_class = &firmware_attributes_class;

	mutex_unlock(&fw_attr_lock);

	return 0;

}

EXPORT_SYMBOL_GPL(fw_attributes_class_get);



int fw_attributes_class_put(void)

{

	mutex_lock(&fw_attr_lock);

	if (!fw_attr_inuse) {

		mutex_unlock(&fw_attr_lock);

		return -EINVAL;

	}

	fw_attr_inuse--;

	if (!fw_attr_inuse) /* No more consumers */

		class_unregister(&firmware_attributes_class);

	mutex_unlock(&fw_attr_lock);

	return 0;

}

EXPORT_SYMBOL_GPL(fw_attributes_class_put);



MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>");

MODULE_LICENSE("GPL");

drivers/platform/x86/firmware_attributes_class.h

0 → 100644
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/* SPDX-License-Identifier: GPL-2.0 */



/* Firmware attributes class helper module */



#ifndef FW_ATTR_CLASS_H

#define FW_ATTR_CLASS_H



int fw_attributes_class_get(struct class **fw_attr_class);

int fw_attributes_class_put(void);



#endif /* FW_ATTR_CLASS_H */