output.c

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/*
 * Copyright (C) 2012 Texas Instruments Ltd
 * Author: Archit Taneja <[email protected]>
 *
 * 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.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <video/omapdss.h>

#include "dss.h"

static LIST_HEAD(output_list);
static DEFINE_MUTEX(output_lock);

int omapdss_output_set_device(struct omap_dss_output *out,
        struct omap_dss_device *dssdev)
{
    int r;

    mutex_lock(&output_lock);

    if (out->device) {
        DSSERR("output already has device %s connected to it\n",
            out->device->name);
        r = -EINVAL;
        goto err;
    }

    if (out->type != dssdev->type) {
        DSSERR("output type and display type don't match\n");
        r = -EINVAL;
        goto err;
    }

    out->device = dssdev;
    dssdev->output = out;

    mutex_unlock(&output_lock);

    return 0;
err:
    mutex_unlock(&output_lock);

    return r;
}
EXPORT_SYMBOL(omapdss_output_set_device);

int omapdss_output_unset_device(struct omap_dss_output *out)
{
    int r;

    mutex_lock(&output_lock);

    if (!out->device) {
        DSSERR("output doesn't have a device connected to it\n");
        r = -EINVAL;
        goto err;
    }

    if (out->device->state != OMAP_DSS_DISPLAY_DISABLED) {
        DSSERR("device %s is not disabled, cannot unset device\n",
                out->device->name);
        r = -EINVAL;
        goto err;
    }

    out->device->output = NULL;
    out->device = NULL;

    mutex_unlock(&output_lock);

    return 0;
err:
    mutex_unlock(&output_lock);

    return r;
}
EXPORT_SYMBOL(omapdss_output_unset_device);

void dss_register_output(struct omap_dss_output *out)
{
    list_add_tail(&out->list, &output_list);
}

void dss_unregister_output(struct omap_dss_output *out)
{
    list_del(&out->list);
}

struct omap_dss_output *omap_dss_get_output(enum omap_dss_output_id id)
{
    struct omap_dss_output *out;

    list_for_each_entry(out, &output_list, list) {
        if (out->id == id)
            return out;
    }

    return NULL;
}

struct omap_dss_output *omapdss_get_output_from_dssdev(struct omap_dss_device *dssdev)
{
    struct omap_dss_output *out = NULL;
    enum omap_dss_output_id id;

    switch (dssdev->type) {
    case OMAP_DISPLAY_TYPE_DPI:
        out = omap_dss_get_output(OMAP_DSS_OUTPUT_DPI);
        break;
    case OMAP_DISPLAY_TYPE_DBI:
        out = omap_dss_get_output(OMAP_DSS_OUTPUT_DBI);
        break;
    case OMAP_DISPLAY_TYPE_SDI:
        out = omap_dss_get_output(OMAP_DSS_OUTPUT_SDI);
        break;
    case OMAP_DISPLAY_TYPE_VENC:
        out = omap_dss_get_output(OMAP_DSS_OUTPUT_VENC);
        break;
    case OMAP_DISPLAY_TYPE_HDMI:
        out = omap_dss_get_output(OMAP_DSS_OUTPUT_HDMI);
        break;
    case OMAP_DISPLAY_TYPE_DSI:
        id = dssdev->phy.dsi.module == 0 ? OMAP_DSS_OUTPUT_DSI1 :
                    OMAP_DSS_OUTPUT_DSI2;
        out = omap_dss_get_output(id);
        break;
    default:
        break;
    }

    return out;
}