This will be used by the Dell and Lenovo WMI management drivers to
prevent both drivers being active.
Signed-off-by: Mark Pearson <markpearson@xxxxxxxxxx>
---
Changes in v2:
- This is a new file requested as part of the review of the proposed
think_lmi.c driver. Labeling as V2 to keep series consistent
Changes in v3:
- Set default in Kconfig, and removed help text
- Allow multiple modules to register with module. Change API names to
better reflect this.
Changes in v4:
- version bump for consistency in series
drivers/platform/x86/Kconfig | 4 ++
drivers/platform/x86/Makefile | 1 +
.../platform/x86/firmware_attributes_class.c | 53 +++++++++++++++++++
.../platform/x86/firmware_attributes_class.h | 13 +++++
4 files changed, 71 insertions(+)
create mode 100644 drivers/platform/x86/firmware_attributes_class.c
create mode 100644 drivers/platform/x86/firmware_attributes_class.h
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 2714f7c38..57da8352d 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1076,6 +1076,10 @@ 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 "Firmware attributes class helper module"
+ 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 dcc8cdb95..147573f69 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -115,6 +115,7 @@ obj-$(CONFIG_TOPSTAR_LAPTOP) += topstar-laptop.o
obj-$(CONFIG_I2C_MULTI_INSTANTIATE) += i2c-multi-instantiate.o
obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
obj-$(CONFIG_TOUCHSCREEN_DMI) += touchscreen_dmi.o
+obj-$(CONFIG_FW_ATTR_CLASS) += firmware_attributes_class.o
# Intel uncore drivers
obj-$(CONFIG_INTEL_IPS) += intel_ips.o
diff --git a/drivers/platform/x86/firmware_attributes_class.c b/drivers/platform/x86/firmware_attributes_class.c
new file mode 100644
index 000000000..31393ce4d
--- /dev/null
+++ b/drivers/platform/x86/firmware_attributes_class.c
@@ -0,0 +1,53 @@
+// 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>
+
+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@xxxxxxxxxx>");
+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 000000000..802f12b45
--- /dev/null
+++ b/drivers/platform/x86/firmware_attributes_class.h
@@ -0,0 +1,13 @@
+/* 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 */
+
+
--
2.31.1
