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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/platform/x86/firmware_attributes_class.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/platform/x86/firmware_attributes_class.c')
-rw-r--r-- | drivers/platform/x86/firmware_attributes_class.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/platform/x86/firmware_attributes_class.c b/drivers/platform/x86/firmware_attributes_class.c new file mode 100644 index 000000000..fafe8eaf6 --- /dev/null +++ b/drivers/platform/x86/firmware_attributes_class.c @@ -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); +static 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"); |