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

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

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Mark Pearson <markpearson@lenovo.com>
Link: https://lore.kernel.org/r/20210530223111.25929-1-markpearson@lenovo.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Mark Pearson 2021-05-30 18:31:09 -04:00 committed by Hans de Goede
parent 6cbaee2e10
commit 17b707fe5f
4 changed files with 68 additions and 0 deletions
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4
drivers/platform/x86/Kconfig
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@ -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

1
drivers/platform/x86/Makefile
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@ -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

52
drivers/platform/x86/firmware_attributes_class.c Normal file
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@ -0,0 +1,52 @@
// 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");

11
drivers/platform/x86/firmware_attributes_class.h Normal file
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@ -0,0 +1,11 @@
/* 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 */