parallel-display.c

Go to the documentation of this file.

/*
 * i.MX drm driver - parallel display implementation
 *
 * Copyright (C) 2012 Sascha Hauer, Pengutronix
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#include <linux/module.h>
#include <drm/drmP.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>
#include <linux/videodev2.h>

#include "imx-drm.h"

#define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
#define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)

struct imx_parallel_display {
    struct drm_connector connector;
    struct imx_drm_connector *imx_drm_connector;
    struct drm_encoder encoder;
    struct imx_drm_encoder *imx_drm_encoder;
    struct device *dev;
    void *edid;
    int edid_len;
    u32 interface_pix_fmt;
    int mode_valid;
    struct drm_display_mode mode;
};

static enum drm_connector_status imx_pd_connector_detect(
        struct drm_connector *connector, bool force)
{
    return connector_status_connected;
}

static void imx_pd_connector_destroy(struct drm_connector *connector)
{
    /* do not free here */
}

static int imx_pd_connector_get_modes(struct drm_connector *connector)
{
    struct imx_parallel_display *imxpd = con_to_imxpd(connector);
    int num_modes = 0;

    if (imxpd->edid) {
        drm_mode_connector_update_edid_property(connector, imxpd->edid);
        num_modes = drm_add_edid_modes(connector, imxpd->edid);
    }

    if (imxpd->mode_valid) {
        struct drm_display_mode *mode = drm_mode_create(connector->dev);
        drm_mode_copy(mode, &imxpd->mode);
        mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
        drm_mode_probed_add(connector, mode);
        num_modes++;
    }

    return num_modes;
}

static int imx_pd_connector_mode_valid(struct drm_connector *connector,
              struct drm_display_mode *mode)
{
    return 0;
}

static struct drm_encoder *imx_pd_connector_best_encoder(
        struct drm_connector *connector)
{
    struct imx_parallel_display *imxpd = con_to_imxpd(connector);

    return &imxpd->encoder;
}

static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
{
}

static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
               const struct drm_display_mode *mode,
               struct drm_display_mode *adjusted_mode)
{
    return true;
}

static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
{
    struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);

    imx_drm_crtc_panel_format(encoder->crtc, DRM_MODE_ENCODER_NONE,
            imxpd->interface_pix_fmt);
}

static void imx_pd_encoder_commit(struct drm_encoder *encoder)
{
}

static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
             struct drm_display_mode *mode,
             struct drm_display_mode *adjusted_mode)
{
}

static void imx_pd_encoder_disable(struct drm_encoder *encoder)
{
}

static void imx_pd_encoder_destroy(struct drm_encoder *encoder)
{
    /* do not free here */
}

static struct drm_connector_funcs imx_pd_connector_funcs = {
    .dpms = drm_helper_connector_dpms,
    .fill_modes = drm_helper_probe_single_connector_modes,
    .detect = imx_pd_connector_detect,
    .destroy = imx_pd_connector_destroy,
};

static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
    .get_modes = imx_pd_connector_get_modes,
    .best_encoder = imx_pd_connector_best_encoder,
    .mode_valid = imx_pd_connector_mode_valid,
};

static struct drm_encoder_funcs imx_pd_encoder_funcs = {
    .destroy = imx_pd_encoder_destroy,
};

static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
    .dpms = imx_pd_encoder_dpms,
    .mode_fixup = imx_pd_encoder_mode_fixup,
    .prepare = imx_pd_encoder_prepare,
    .commit = imx_pd_encoder_commit,
    .mode_set = imx_pd_encoder_mode_set,
    .disable = imx_pd_encoder_disable,
};

static int imx_pd_register(struct imx_parallel_display *imxpd)
{
    int ret;

    drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);

    imxpd->connector.funcs = &imx_pd_connector_funcs;
    imxpd->encoder.funcs = &imx_pd_encoder_funcs;

    imxpd->encoder.encoder_type = DRM_MODE_ENCODER_NONE;
    imxpd->connector.connector_type = DRM_MODE_CONNECTOR_VGA;

    drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
    ret = imx_drm_add_encoder(&imxpd->encoder, &imxpd->imx_drm_encoder,
            THIS_MODULE);
    if (ret) {
        dev_err(imxpd->dev, "adding encoder failed with %d\n", ret);
        return ret;
    }

    drm_connector_helper_add(&imxpd->connector,
            &imx_pd_connector_helper_funcs);

    ret = imx_drm_add_connector(&imxpd->connector,
            &imxpd->imx_drm_connector, THIS_MODULE);
    if (ret) {
        imx_drm_remove_encoder(imxpd->imx_drm_encoder);
        dev_err(imxpd->dev, "adding connector failed with %d\n", ret);
        return ret;
    }

    imxpd->connector.encoder = &imxpd->encoder;

    return 0;
}

static int __devinit imx_pd_probe(struct platform_device *pdev)
{
    struct device_node *np = pdev->dev.of_node;
    const u8 *edidp;
    struct imx_parallel_display *imxpd;
    int ret;
    const char *fmt;

    imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
    if (!imxpd)
        return -ENOMEM;

    edidp = of_get_property(np, "edid", &imxpd->edid_len);
    if (edidp)
        imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);

    ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
    if (!ret) {
        if (!strcmp(fmt, "rgb24"))
            imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
        else if (!strcmp(fmt, "rgb565"))
            imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
    }

    imxpd->dev = &pdev->dev;

    ret = imx_pd_register(imxpd);
    if (ret)
        return ret;

    ret = imx_drm_encoder_add_possible_crtcs(imxpd->imx_drm_encoder, np);

    platform_set_drvdata(pdev, imxpd);

    return 0;
}

static int __devexit imx_pd_remove(struct platform_device *pdev)
{
    struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);
    struct drm_connector *connector = &imxpd->connector;
    struct drm_encoder *encoder = &imxpd->encoder;

    drm_mode_connector_detach_encoder(connector, encoder);

    imx_drm_remove_connector(imxpd->imx_drm_connector);
    imx_drm_remove_encoder(imxpd->imx_drm_encoder);

    return 0;
}

static const struct of_device_id imx_pd_dt_ids[] = {
    { .compatible = "fsl,imx-parallel-display", },
    { /* sentinel */ }
};

static struct platform_driver imx_pd_driver = {
    .probe      = imx_pd_probe,
    .remove     = __devexit_p(imx_pd_remove),
    .driver     = {
        .of_match_table = imx_pd_dt_ids,
        .name   = "imx-parallel-display",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(imx_pd_driver);

MODULE_DESCRIPTION("i.MX parallel display driver");
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_LICENSE("GPL");