Camera: Bring over camera driver changes

Bring over camera driver changes as of msm-4.19
commit  5a5551a7 (Merge "msm: camera: reqmgr: Fix CRM
shift one req issue").

Change-Id: Ic0c2b2d74d1b3470c1c51d98228e312fb13c501a
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>

drivers/cam_sync/cam_sync_api.h

@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __CAM_SYNC_API_H__
+#define __CAM_SYNC_API_H__
+
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/completion.h>
+#include <linux/videodev2.h>
+#include <media/cam_sync.h>
+
+#define SYNC_DEBUG_NAME_LEN 63
+typedef void (*sync_callback)(int32_t sync_obj, int status, void *data);
+
+/* Kernel APIs */
+
+/**
+ * @brief: Creates a sync object
+ *
+ *  The newly created sync obj is assigned to sync_obj.
+ *  sync object.
+ *
+ * @param sync_obj   : Pointer to int referencing the sync object.
+ * @param name : Optional parameter associating a name with the sync object for
+ * debug purposes. Only first SYNC_DEBUG_NAME_LEN bytes are accepted,
+ * rest will be ignored.
+ *
+ * @return Status of operation. Zero in case of success.
+ * -EINVAL will be returned if sync_obj is an invalid pointer.
+ * -ENOMEM will be returned if the kernel can't allocate space for
+ * sync object.
+ */
+int cam_sync_create(int32_t *sync_obj, const char *name);
+
+/**
+ * @brief: Registers a callback with a sync object
+ *
+ * @param cb_func:  Pointer to callback to be registered
+ * @param userdata: Opaque pointer which will be passed back with callback.
+ * @param sync_obj: int referencing the sync object.
+ *
+ * @return Status of operation. Zero in case of success.
+ * -EINVAL will be returned if userdata is invalid.
+ * -ENOMEM will be returned if cb_func is invalid.
+ *
+ */
+int cam_sync_register_callback(sync_callback cb_func,
+	void *userdata, int32_t sync_obj);
+
+/**
+ * @brief: De-registers a callback with a sync object
+ *
+ * @param cb_func:  Pointer to callback to be de-registered
+ * @param userdata: Opaque pointer which will be passed back with callback.
+ * @param sync_obj: int referencing the sync object.
+ *
+ * @return Status of operation. Zero in case of success.
+ * -EINVAL will be returned if userdata is invalid.
+ * -ENOMEM will be returned if cb_func is invalid.
+ */
+int cam_sync_deregister_callback(sync_callback cb_func,
+	void *userdata, int32_t sync_obj);
+
+/**
+ * @brief: Signals a sync object with the status argument.
+ *
+ * This function will signal the sync object referenced by the sync_obj
+ * parameter and when doing so, will trigger callbacks in both user space and
+ * kernel. Callbacks will triggered asynchronously and their order of execution
+ * is not guaranteed. The status parameter will indicate whether the entity
+ * performing the signaling wants to convey an error case or a success case.
+ *
+ * @param sync_obj: int referencing the sync object.
+ * @param status: Status of the signaling. Can be either SYNC_SIGNAL_ERROR or
+ * SYNC_SIGNAL_SUCCESS.
+ *
+ * @return Status of operation. Negative in case of error. Zero otherwise.
+ */
+int cam_sync_signal(int32_t sync_obj, uint32_t status);
+
+/**
+ * @brief: Merges multiple sync objects
+ *
+ * This function will merge multiple sync objects into a sync group.
+ *
+ * @param sync_obj: pointer to a block of ints to be merged
+ * @param num_objs: Number of ints in the block
+ *
+ * @return Status of operation. Negative in case of error. Zero otherwise.
+ */
+int cam_sync_merge(int32_t *sync_obj, uint32_t num_objs, int32_t *merged_obj);
+
+/**
+ * @brief: get ref count of sync obj
+ *
+ * This function will increment ref count for the sync object, and the ref
+ * count will be decremented when this sync object is signaled.
+ *
+ * @param sync_obj: sync object
+ *
+ * @return Status of operation. Negative in case of error. Zero otherwise.
+ */
+int cam_sync_get_obj_ref(int32_t sync_obj);
+
+/**
+ * @brief: put ref count of sync obj
+ *
+ * This function will decrement ref count for the sync object.
+ *
+ * @param sync_obj: sync object
+ *
+ * @return Status of operation. Negative in case of error. Zero otherwise.
+ */
+int cam_sync_put_obj_ref(int32_t sync_obj);
+
+/**
+ * @brief: Destroys a sync object
+ *
+ * @param sync_obj: int referencing the sync object to be destroyed
+ *
+ * @return Status of operation. Negative in case of error. Zero otherwise.
+ */
+int cam_sync_destroy(int32_t sync_obj);
+
+/**
+ * @brief: Waits for a sync object synchronously
+ *
+ * Does a wait on the sync object identified by sync_obj for a maximum
+ * of timeout_ms milliseconds. Must not be called from interrupt context as
+ * this API can sleep. Should be called from process context only.
+ *
+ * @param sync_obj: int referencing the sync object to be waited upon
+ * @timeout_ms sync_obj: Timeout in ms.
+ *
+ * @return 0 upon success, -EINVAL if sync object is in bad state or arguments
+ * are invalid, -ETIMEDOUT if wait times out.
+ */
+int cam_sync_wait(int32_t sync_obj, uint64_t timeout_ms);
+
+
+#endif /* __CAM_SYNC_API_H__ */