diff options
author | Mark Pearson <markpearson@lenovo.com> | 2021-05-31 01:31:09 +0300 |
---|---|---|
committer | Hans de Goede <hdegoede@redhat.com> | 2021-06-16 18:47:51 +0300 |
commit | 17b707fe5fbd3c019691873c1c11bddb0e0f7225 (patch) | |
tree | f3a84c8296fc4c32e5c8cdf6b2e9978f086c353c /drivers/platform | |
parent | 6cbaee2e109ed0f7327a2d3cbb412f36fd8873e0 (diff) | |
download | linux-17b707fe5fbd3c019691873c1c11bddb0e0f7225.tar.xz |
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: 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>
Diffstat (limited to 'drivers/platform')
-rw-r--r-- | drivers/platform/x86/Kconfig | 4 | ||||
-rw-r--r-- | drivers/platform/x86/Makefile | 1 | ||||
-rw-r--r-- | drivers/platform/x86/firmware_attributes_class.c | 52 | ||||
-rw-r--r-- | drivers/platform/x86/firmware_attributes_class.h | 11 |
4 files changed, 68 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 9a668dae2738..d6fa071d78de 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -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 diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 415bec18ece2..98c776967fa0 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -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 diff --git a/drivers/platform/x86/firmware_attributes_class.c b/drivers/platform/x86/firmware_attributes_class.c new file mode 100644 index 000000000000..d62ec3d71ede --- /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); +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"); diff --git a/drivers/platform/x86/firmware_attributes_class.h b/drivers/platform/x86/firmware_attributes_class.h new file mode 100644 index 000000000000..486485cb1f54 --- /dev/null +++ b/drivers/platform/x86/firmware_attributes_class.h @@ -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 */ |