path: root/drivers/media/video/s5p-fimc/fimc-capture.c

/*
 * Samsung S5P SoC series camera interface (camera capture) driver
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd
 * Author: Sylwester Nawrocki, <s.nawrocki@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/bug.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/i2c.h>

#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>

#include "fimc-core.h"

static struct v4l2_subdev *fimc_subdev_register(struct fimc_dev *fimc,
					    struct s5p_fimc_isp_info *isp_info)
{
	struct i2c_adapter *i2c_adap;
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct v4l2_subdev *sd = NULL;

	i2c_adap = i2c_get_adapter(isp_info->i2c_bus_num);
	if (!i2c_adap)
		return ERR_PTR(-ENOMEM);

	sd = v4l2_i2c_new_subdev_board(&vid_cap->v4l2_dev, i2c_adap,
				       isp_info->board_info, NULL);
	if (!sd) {
		v4l2_err(&vid_cap->v4l2_dev, "failed to acquire subdev\n");
		return NULL;
	}

	v4l2_info(&vid_cap->v4l2_dev, "subdevice %s registered successfuly\n",
		isp_info->board_info->type);

	return sd;
}

static void fimc_subdev_unregister(struct fimc_dev *fimc)
{
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct i2c_client *client;

	if (vid_cap->input_index < 0)
		return;	/* Subdevice already released or not registered. */

	if (vid_cap->sd) {
		v4l2_device_unregister_subdev(vid_cap->sd);
		client = v4l2_get_subdevdata(vid_cap->sd);
		i2c_unregister_device(client);
		i2c_put_adapter(client->adapter);
		vid_cap->sd = NULL;
	}

	vid_cap->input_index = -1;
}

/**
 * fimc_subdev_attach - attach v4l2_subdev to camera host interface
 *
 * @fimc: FIMC device information
 * @index: index to the array of available subdevices,
 *	   -1 for full array search or non negative value
 *	   to select specific subdevice
 */
static int fimc_subdev_attach(struct fimc_dev *fimc, int index)
{
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct s5p_platform_fimc *pdata = fimc->pdata;
	struct s5p_fimc_isp_info *isp_info;
	struct v4l2_subdev *sd;
	int i;

	for (i = 0; i < FIMC_MAX_CAMIF_CLIENTS; ++i) {
		isp_info = pdata->isp_info[i];

		if (!isp_info || (index >= 0 && i != index))
			continue;

		sd = fimc_subdev_register(fimc, isp_info);
		if (!IS_ERR_OR_NULL(sd)) {
			vid_cap->sd = sd;
			vid_cap->input_index = i;

			return 0;
		}
	}

	vid_cap->input_index = -1;
	vid_cap->sd = NULL;
	v4l2_err(&vid_cap->v4l2_dev, "fimc%d: sensor attach failed\n",
		 fimc->id);
	return -ENODEV;
}

static int fimc_isp_subdev_init(struct fimc_dev *fimc, unsigned int index)
{
	struct s5p_fimc_isp_info *isp_info;
	int ret;

	if (index >= FIMC_MAX_CAMIF_CLIENTS)
		return -EINVAL;

	isp_info = fimc->pdata->isp_info[index];
	if (!isp_info)
		return -EINVAL;

	if (isp_info->clk_frequency)
		clk_set_rate(fimc->clock[CLK_CAM], isp_info->clk_frequency);

	ret = clk_enable(fimc->clock[CLK_CAM]);
	if (ret)
		return ret;

	ret = fimc_subdev_attach(fimc, index);
	if (ret)
		return ret;

	ret = fimc_hw_set_camera_polarity(fimc, isp_info);
	if (ret)
		return ret;

	ret = v4l2_subdev_call(fimc->vid_cap.sd, core, s_power, 1);
	if (!ret)
		return ret;

	/* enabling power failed so unregister subdev */
	fimc_subdev_unregister(fimc);

	v4l2_err(&fimc->vid_cap.v4l2_dev, "ISP initialization failed: %d\n",
		 ret);

	return ret;
}

static int fimc_stop_capture(struct fimc_dev *fimc)
{
	unsigned long flags;
	struct fimc_vid_cap *cap;
	struct fimc_vid_buffer *buf;

	cap = &fimc->vid_cap;

	if (!fimc_capture_active(fimc))
		return 0;

	spin_lock_irqsave(&fimc->slock, flags);
	set_bit(ST_CAPT_SHUT, &fimc->state);
	fimc_deactivate_capture(fimc);
	spin_unlock_irqrestore(&fimc->slock, <