firmware: split firmware fallback functionality into its own file
The firmware fallback code is optional. Split that code out to help
distinguish the fallback functionlity from othere core firmware loader
features. This should make it easier to maintain and review code
changes.
The reason for keeping the configuration onto a table which is built-in
if you enable firmware loading is so that we can later enable the kernel
after subsequent patches to tweak this configuration, even if the
firmware loader is modular.
This introduces no functional changes.
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/base/firmware_fallback.h b/drivers/base/firmware_fallback.h
new file mode 100644
index 0000000..550498c
--- /dev/null
+++ b/drivers/base/firmware_fallback.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __FIRMWARE_FALLBACK_H
+#define __FIRMWARE_FALLBACK_H
+
+#include <linux/firmware.h>
+#include <linux/device.h>
+
+/**
+ * struct firmware_fallback_config - firmware fallback configuratioon settings
+ *
+ * Helps describe and fine tune the fallback mechanism.
+ *
+ * @force_sysfs_fallback: force the sysfs fallback mechanism to be used
+ * as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
+ * @old_timeout: for internal use
+ * @loading_timeout: the timeout to wait for the fallback mechanism before
+ * giving up, in seconds.
+ */
+struct firmware_fallback_config {
+ const bool force_sysfs_fallback;
+ int old_timeout;
+ int loading_timeout;
+};
+
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+int fw_sysfs_fallback(struct firmware *fw, const char *name,
+ struct device *device,
+ unsigned int opt_flags,
+ int ret);
+void kill_pending_fw_fallback_reqs(bool only_kill_custom);
+
+void fw_fallback_set_cache_timeout(void);
+void fw_fallback_set_default_timeout(void);
+
+int register_sysfs_loader(void);
+void unregister_sysfs_loader(void);
+#else /* CONFIG_FW_LOADER_USER_HELPER */
+static inline int fw_sysfs_fallback(struct firmware *fw, const char *name,
+ struct device *device,
+ unsigned int opt_flags,
+ int ret)
+{
+ /* Keep carrying over the same error */
+ return ret;
+}
+
+static inline void kill_pending_fw_fallback_reqs(bool only_kill_custom) { }
+static inline void fw_fallback_set_cache_timeout(void) { }
+static inline void fw_fallback_set_default_timeout(void) { }
+
+static inline int register_sysfs_loader(void)
+{
+ return 0;
+}
+
+static inline void unregister_sysfs_loader(void)
+{
+}
+#endif /* CONFIG_FW_LOADER_USER_HELPER */
+
+#endif /* __FIRMWARE_FALLBACK_H */