drivers/media/platform/msm/camera/cam_jpeg/cam_jpeg_context.c

/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/debugfs.h>
#include <linux/videodev2.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include "cam_mem_mgr.h"
#include "cam_sync_api.h"
#include "cam_jpeg_context.h"
#include "cam_context_utils.h"
#include "cam_debug_util.h"

static int __cam_jpeg_ctx_acquire_dev_in_available(struct cam_context *ctx,
	struct cam_acquire_dev_cmd *cmd)
{
	int rc;

	rc = cam_context_acquire_dev_to_hw(ctx, cmd);
	if (rc)
		CAM_ERR(CAM_JPEG, "Unable to Acquire device %d", rc);
	else
		ctx->state = CAM_CTX_ACQUIRED;

	return rc;
}

static int __cam_jpeg_ctx_release_dev_in_acquired(struct cam_context *ctx,
	struct cam_release_dev_cmd *cmd)
{
	int rc;

	rc = cam_context_release_dev_to_hw(ctx, cmd);
	if (rc)
		CAM_ERR(CAM_JPEG, "Unable to release device %d", rc);

	ctx->state = CAM_CTX_AVAILABLE;

	return rc;
}

static int __cam_jpeg_ctx_config_dev_in_acquired(struct cam_context *ctx,
	struct cam_config_dev_cmd *cmd)
{
	return cam_context_prepare_dev_to_hw(ctx, cmd);
}

static int __cam_jpeg_ctx_handle_buf_done_in_acquired(void *ctx,
	uint32_t evt_id, void *done)
{
	return cam_context_buf_done_from_hw(ctx, done, evt_id);
}

/* top state machine */
static struct cam_ctx_ops
	cam_jpeg_ctx_state_machine[CAM_CTX_STATE_MAX] = {
	/* Uninit */
	{
		.ioctl_ops = { },
		.crm_ops = { },
		.irq_ops = NULL,
	},
	/* Available */
	{
		.ioctl_ops = {
			.acquire_dev = __cam_jpeg_ctx_acquire_dev_in_available,
		},
		.crm_ops = { },
		.irq_ops = NULL,
	},
	/* Acquired */
	{
		.ioctl_ops = {
			.release_dev = __cam_jpeg_ctx_release_dev_in_acquired,
			.config_dev = __cam_jpeg_ctx_config_dev_in_acquired,
		},
		.crm_ops = { },
		.irq_ops = __cam_jpeg_ctx_handle_buf_done_in_acquired,
	},
};

int cam_jpeg_context_init(struct cam_jpeg_context *ctx,
	struct cam_context *ctx_base,
	struct cam_hw_mgr_intf *hw_intf)
{
	int rc;
	int i;

	if (!ctx || !ctx_base) {
		CAM_ERR(CAM_JPEG, "Invalid Context");
		rc = -EFAULT;
		goto err;
	}

	memset(ctx, 0, sizeof(*ctx));

	ctx->base = ctx_base;

	for (i = 0; i < CAM_CTX_REQ_MAX; i++)
		ctx->req_base[i].req_priv = ctx;

	rc = cam_context_init(ctx_base, NULL, hw_intf, ctx->req_base,
		CAM_CTX_REQ_MAX);
	if (rc) {
		CAM_ERR(CAM_JPEG, "Camera Context Base init failed");
		goto err;
	}

	ctx_base->state_machine = cam_jpeg_ctx_state_machine;
	ctx_base->ctx_priv = ctx;

err:
	return rc;
}

int cam_jpeg_context_deinit(struct cam_jpeg_context *ctx)
{
	if (!ctx || !ctx->base) {
		CAM_ERR(CAM_JPEG, "Invalid params: %pK", ctx);
		return -EINVAL;
	}

	cam_context_deinit(ctx->base);

	memset(ctx, 0, sizeof(*ctx));

	return 0;
}