/*
 * drivers/gpu/drm/omapdrm/omap_connector.c
 *
 * Copyright (C) 2011 Texas Instruments
 * Author: Rob Clark <rob@ti.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.
 *
 * 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 <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>

#include "omap_drv.h"

/*
 * connector funcs
 */

#define to_omap_connector(x) container_of(x, struct omap_connector, base)

struct omap_connector {
        struct drm_connector base;
        struct omap_dss_device *dssdev;
        struct drm_encoder *encoder;
        bool hdmi_mode;
};

bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
{
        struct omap_connector *omap_connector = to_omap_connector(connector);

        return omap_connector->hdmi_mode;
}

void copy_timings_omap_to_drm(struct drm_display_mode *mode,
                struct omap_video_timings *timings)
{
        mode->clock = timings->pixelclock / 1000;

        mode->hdisplay = timings->x_res;
        mode->hsync_start = mode->hdisplay + timings->hfp;
        mode->hsync_end = mode->hsync_start + timings->hsw;
        mode->htotal = mode->hsync_end + timings->hbp;

        mode->vdisplay = timings->y_res;
        mode->vsync_start = mode->vdisplay + timings->vfp;
        mode->vsync_end = mode->vsync_start + timings->vsw;
        mode->vtotal = mode->vsync_end + timings->vbp;

        mode->flags = 0;

        if (timings->interlace)
                mode->flags |= DRM_MODE_FLAG_INTERLACE;

        if (timings->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
                mode->flags |= DRM_MODE_FLAG_PHSYNC;
        else
                mode->flags |= DRM_MODE_FLAG_NHSYNC;

        if (timings->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
                mode->flags |= DRM_MODE_FLAG_PVSYNC;
        else
                mode->flags |= DRM_MODE_FLAG_NVSYNC;
}

void copy_timings_drm_to_omap(struct omap_video_timings *timings,
                struct drm_display_mode *mode)
{
        timings->pixelclock = mode->clock * 1000;

        timings->x_res = mode->hdisplay;
        timings->hfp = mode->hsync_start - mode->hdisplay;
        timings->hsw = mode->hsync_end - mode->hsync_start;
        timings->hbp = mode->htotal - mode->hsync_end;

        timings->y_res = mode->vdisplay;
        timings->vfp = mode->vsync_start - mode->vdisplay;
        timings->vsw = mode->vsync_end - mode->vsync_start;
        timings->vbp = mode->vtotal - mode->vsync_end;

        timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);

        if (mode->flags & DRM_MODE_FLAG_PHSYNC)
                timings->hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
        else
                timings->hsync_level = OMAPDSS_SIG_ACTIVE_LOW;

        if (mode->flags & DRM_MODE_FLAG_PVSYNC)
                timings->vsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
        else
                timings->vsync_level = OMAPDSS_SIG_ACTIVE_LOW;

        timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
        timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
        timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE;
}

static enum drm_connector_status omap_connector_detect(
                struct drm_connector *connector, bool force)
{
        struct omap_connector *omap_connector = to_omap_connector(connector);
        struct omap_dss_device *dssdev = omap_connector->dssdev;
        struct omap_dss_driver *dssdrv = dssdev->driver;
        enum drm_connector_status ret;

        if (dssdrv->detect) {
                if (dssdrv->detect(dssdev))
                        ret = connector_status_connected;
                else
                        ret = connector_status_disconnected;
        } else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
                        dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
                        dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
                        dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
                ret = connector_status_connected;
        } else {
                ret = connector_status_unknown;
        }

        VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);

        return ret;
}

static void omap_connector_destroy(struct drm_connector *connector)
{
        struct omap_connector *omap_connector = to_omap_connector(connector);
        struct omap_dss_device *dssdev = omap_connector->dssdev;

        DBG("%s", omap_connector->dssdev->name);
        drm_connector_unregister(connector);
        drm_connector_cleanup(connector);
        kfree(omap_connector);

        omap_dss_put_device(dssdev);
}

#define MAX_EDID  512

static int omap_connector_get_modes(struct drm_connector *connector)
{
        struct omap_connector *omap_connector = to_omap_connector(connector);
        struct omap_dss_device *dssdev = omap_connector->dssdev;
        struct omap_dss_driver *dssdrv = dssdev->driver;
        struct drm_device *dev = connector->dev;
        int n = 0;

        DBG("%s", omap_connector->dssdev->name);

        /* if display exposes EDID, then we parse that in the normal way to
         * build table of supported modes.. otherwise (ie. fixed resolution
         * LCD panels) we just return a single mode corresponding to the
         * currently configured timings:
         */
        if (dssdrv->read_edid) {
                void *edid = kzalloc(MAX_EDID, GFP_KERNEL);

                if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
                                drm_edid_is_valid(edid)) {
                        drm_mode_connector_update_edid_property(
                                        connector, edid);
                        n = drm_add_edid_modes(connector, edid);

                        omap_connector->hdmi_mode =
                                drm_detect_hdmi_monitor(edid);
                } else {
                        drm_mode_connector_update_edid_property(
                                        connector, NULL);
                }

                kfree(edid);
        } else {
                struct drm_display_mode *mode = drm_mode_create(dev);
                struct omap_video_timings timings = {0};

                dssdrv->get_timings(dssdev, &timings);

                copy_timings_omap_to_drm(mode, &timings);

                mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
                drm_mode_set_name(mode);
                drm_mode_probed_add(connector, mode);

                n = 1;
        }

        return n;
}

static int omap_connector_mode_valid(struct drm_connector *connector,
                                 struct drm_display_mode *mode)
{
        struct omap_connector *omap_connector = to_omap_connector(connector);
        struct omap_dss_device *dssdev = omap_connector->dssdev;
        struct omap_dss_driver *dssdrv = dssdev->driver;
        struct omap_video_timings timings = {0};
        struct drm_device *dev = connector->dev;
        struct drm_display_mode *new_mode;
        int r, ret = MODE_BAD;

        copy_timings_drm_to_omap(&timings, mode);
        mode->vrefresh = drm_mode_vrefresh(mode);

        /*
         * if the panel driver doesn't have a check_timings, it's most likely
         * a fixed resolution panel, check if the timings match with the
         * panel's timings
         */
        if (dssdrv->check_timings) {
                r = dssdrv->check_timings(dssdev, &timings);
        } else {
                struct omap_video_timings t = {0};

                dssdrv->get_timings(dssdev, &t);

                if (memcmp(&timings, &t, sizeof(struct omap_video_timings)))
                        r = -EINVAL;
                else
                        r = 0;
        }

        if (!r) {
                /* check if vrefresh is still valid */
                new_mode = drm_mode_duplicate(dev, mode);
                new_mode->clock = timings.pixelclock / 1000;
                new_mode->vrefresh = 0;
                if (mode->vrefresh == drm_mode_vrefresh(new_mode))
                        ret = MODE_OK;
                drm_mode_destroy(dev, new_mode);
        }

        DBG("connector: mode %s: "
                        "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
                        (ret == MODE_OK) ? "valid" : "invalid",
                        mode->base.id, mode->name, mode->vrefresh, mode->clock,
                        mode->hdisplay, mode->hsync_start,
                        mode->hsync_end, mode->htotal,
                        mode->vdisplay, mode->vsync_start,
                        mode->vsync_end, mode->vtotal, mode->type, mode->flags);

        return ret;
}

struct drm_encoder *omap_connector_attached_encoder(
                struct drm_connector *connector)
{
        struct omap_connector *omap_connector = to_omap_connector(connector);
        return omap_connector->encoder;
}

static const struct drm_connector_funcs omap_connector_funcs = {
        .dpms = drm_atomic_helper_connector_dpms,
        .reset = drm_atomic_helper_connector_reset,
        .detect = omap_connector_detect,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .destroy = omap_connector_destroy,
        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
        .get_modes = omap_connector_get_modes,
        .mode_valid = omap_connector_mode_valid,
        .best_encoder = omap_connector_attached_encoder,
};

/* initialize connector */
struct drm_connector *omap_connector_init(struct drm_device *dev,
                int connector_type, struct omap_dss_device *dssdev,
                struct drm_encoder *encoder)
{
        struct drm_connector *connector = NULL;
        struct omap_connector *omap_connector;

        DBG("%s", dssdev->name);

        omap_dss_get_device(dssdev);

        omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
        if (!omap_connector)
                goto fail;

        omap_connector->dssdev = dssdev;
        omap_connector->encoder = encoder;

        connector = &omap_connector->base;

        drm_connector_init(dev, connector, &omap_connector_funcs,
                                connector_type);
        drm_connector_helper_add(connector, &omap_connector_helper_funcs);

#if 0 /* enable when dss2 supports hotplug */
        if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
                connector->polled = 0;
        else
#endif
                connector->polled = DRM_CONNECTOR_POLL_CONNECT |
                                DRM_CONNECTOR_POLL_DISCONNECT;

        connector->interlace_allowed = 1;
        connector->doublescan_allowed = 0;

        drm_connector_register(connector);

        return connector;

fail:
        if (connector)
                omap_connector_destroy(connector);

        return NULL;
}