/*
 * Copyright © 2006-2011 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *      jim liu <jim.liu@intel.com>
 */

#include <linux/pm_runtime.h>

#include <drm/drm.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_print.h>
#include <drm/drm_simple_kms_helper.h>

#include "cdv_device.h"
#include "psb_drv.h"
#include "psb_intel_drv.h"
#include "psb_intel_reg.h"

/* hdmi control bits */
#define HDMI_NULL_PACKETS_DURING_VSYNC  (1 << 9)
#define HDMI_BORDER_ENABLE              (1 << 7)
#define HDMI_AUDIO_ENABLE               (1 << 6)
#define HDMI_VSYNC_ACTIVE_HIGH          (1 << 4)
#define HDMI_HSYNC_ACTIVE_HIGH          (1 << 3)
/* hdmi-b control bits */
#define HDMIB_PIPE_B_SELECT             (1 << 30)


struct mid_intel_hdmi_priv {
        u32 hdmi_reg;
        u32 save_HDMIB;
        bool has_hdmi_sink;
        bool has_hdmi_audio;
        /* Should set this when detect hotplug */
        bool hdmi_device_connected;
        struct drm_device *dev;
};

static void cdv_hdmi_mode_set(struct drm_encoder *encoder,
                        struct drm_display_mode *mode,
                        struct drm_display_mode *adjusted_mode)
{
        struct drm_device *dev = encoder->dev;
        struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
        struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
        u32 hdmib;
        struct drm_crtc *crtc = encoder->crtc;
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);

        hdmib = (2 << 10);

        if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                hdmib |= HDMI_VSYNC_ACTIVE_HIGH;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                hdmib |= HDMI_HSYNC_ACTIVE_HIGH;

        if (gma_crtc->pipe == 1)
                hdmib |= HDMIB_PIPE_B_SELECT;

        if (hdmi_priv->has_hdmi_audio) {
                hdmib |= HDMI_AUDIO_ENABLE;
                hdmib |= HDMI_NULL_PACKETS_DURING_VSYNC;
        }

        REG_WRITE(hdmi_priv->hdmi_reg, hdmib);
        REG_READ(hdmi_priv->hdmi_reg);
}

static void cdv_hdmi_dpms(struct drm_encoder *encoder, int mode)
{
        struct drm_device *dev = encoder->dev;
        struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
        struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
        u32 hdmib;

        hdmib = REG_READ(hdmi_priv->hdmi_reg);

        if (mode != DRM_MODE_DPMS_ON)
                REG_WRITE(hdmi_priv->hdmi_reg, hdmib & ~HDMIB_PORT_EN);
        else
                REG_WRITE(hdmi_priv->hdmi_reg, hdmib | HDMIB_PORT_EN);
        REG_READ(hdmi_priv->hdmi_reg);
}

static void cdv_hdmi_save(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
        struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;

        hdmi_priv->save_HDMIB = REG_READ(hdmi_priv->hdmi_reg);
}

static void cdv_hdmi_restore(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
        struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;

        REG_WRITE(hdmi_priv->hdmi_reg, hdmi_priv->save_HDMIB);
        REG_READ(hdmi_priv->hdmi_reg);
}

static enum drm_connector_status cdv_hdmi_detect(
                                struct drm_connector *connector, bool force)
{
        struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
        struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
        struct edid *edid = NULL;
        enum drm_connector_status status = connector_status_disconnected;

        edid = drm_get_edid(connector, connector->ddc);

        hdmi_priv->has_hdmi_sink = false;
        hdmi_priv->has_hdmi_audio = false;
        if (edid) {
                if (edid->input & DRM_EDID_INPUT_DIGITAL) {
                        status = connector_status_connected;
                        hdmi_priv->has_hdmi_sink =
                                                drm_detect_hdmi_monitor(edid);
                        hdmi_priv->has_hdmi_audio =
                                                drm_detect_monitor_audio(edid);
                }
                kfree(edid);
        }
        return status;
}

static int cdv_hdmi_set_property(struct drm_connector *connector,
                                       struct drm_property *property,
                                       uint64_t value)
{
        struct drm_encoder *encoder = connector->encoder;

        if (!strcmp(property->name, "scaling mode") && encoder) {
                struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
                bool centre;
                uint64_t curValue;

                if (!crtc)
                        return -1;

                switch (value) {
                case DRM_MODE_SCALE_FULLSCREEN:
                        break;
                case DRM_MODE_SCALE_NO_SCALE:
                        break;
                case DRM_MODE_SCALE_ASPECT:
                        break;
                default:
                        return -1;
                }

                if (drm_object_property_get_value(&connector->base,
                                                        property, &curValue))
                        return -1;

                if (curValue == value)
                        return 0;

                if (drm_object_property_set_value(&connector->base,
                                                        property, value))
                        return -1;

                centre = (curValue == DRM_MODE_SCALE_NO_SCALE) ||
                        (value == DRM_MODE_SCALE_NO_SCALE);

                if (crtc->saved_mode.hdisplay != 0 &&
                    crtc->saved_mode.vdisplay != 0) {
                        if (centre) {
                                if (!drm_crtc_helper_set_mode(encoder->crtc, &crtc->saved_mode,
                                            encoder->crtc->x, encoder->crtc->y, encoder->crtc->primary->fb))
                                        return -1;
                        } else {
                                const struct drm_encoder_helper_funcs *helpers
                                                    = encoder->helper_private;
                                helpers->mode_set(encoder, &crtc->saved_mode,
                                             &crtc->saved_adjusted_mode);
                        }
                }
        }
        return 0;
}

/*
 * Return the list of HDMI DDC modes if available.
 */
static int cdv_hdmi_get_modes(struct drm_connector *connector)
{
        struct edid *edid = NULL;
        int ret = 0;

        edid = drm_get_edid(connector, connector->ddc);
        if (edid) {
                drm_connector_update_edid_property(connector, edid);
                ret = drm_add_edid_modes(connector, edid);
                kfree(edid);
        }
        return ret;
}

static enum drm_mode_status cdv_hdmi_mode_valid(struct drm_connector *connector,
                                 const struct drm_display_mode *mode)
{
        if (mode->clock > 165000)
                return MODE_CLOCK_HIGH;
        if (mode->clock < 20000)
                return MODE_CLOCK_HIGH;

        /* just in case */
        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
                return MODE_NO_DBLESCAN;

        /* just in case */
        if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                return MODE_NO_INTERLACE;

        return MODE_OK;
}

static void cdv_hdmi_destroy(struct drm_connector *connector)
{
        struct gma_connector *gma_connector = to_gma_connector(connector);
        struct gma_i2c_chan *ddc_bus = to_gma_i2c_chan(connector->ddc);

        gma_i2c_destroy(ddc_bus);
        drm_connector_cleanup(connector);
        kfree(gma_connector);
}

static const struct drm_encoder_helper_funcs cdv_hdmi_helper_funcs = {
        .dpms = cdv_hdmi_dpms,
        .prepare = gma_encoder_prepare,
        .mode_set = cdv_hdmi_mode_set,
        .commit = gma_encoder_commit,
};

static const struct drm_connector_helper_funcs
                                        cdv_hdmi_connector_helper_funcs = {
        .get_modes = cdv_hdmi_get_modes,
        .mode_valid = cdv_hdmi_mode_valid,
        .best_encoder = gma_best_encoder,
};

static const struct drm_connector_funcs cdv_hdmi_connector_funcs = {
        .dpms = drm_helper_connector_dpms,
        .detect = cdv_hdmi_detect,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .set_property = cdv_hdmi_set_property,
        .destroy = cdv_hdmi_destroy,
};

void cdv_hdmi_init(struct drm_device *dev,
                        struct psb_intel_mode_device *mode_dev, int reg)
{
        struct gma_encoder *gma_encoder;
        struct gma_connector *gma_connector;
        struct drm_connector *connector;
        struct mid_intel_hdmi_priv *hdmi_priv;
        struct gma_i2c_chan *ddc_bus;
        int ddc_reg;
        int ret;

        gma_encoder = kzalloc_obj(struct gma_encoder);
        if (!gma_encoder)
                return;

        gma_connector = kzalloc_obj(struct gma_connector);
        if (!gma_connector)
                goto err_free_encoder;

        hdmi_priv = kzalloc_obj(struct mid_intel_hdmi_priv);
        if (!hdmi_priv)
                goto err_free_connector;

        connector = &gma_connector->base;
        connector->polled = DRM_CONNECTOR_POLL_HPD;
        gma_connector->save = cdv_hdmi_save;
        gma_connector->restore = cdv_hdmi_restore;

        switch (reg) {
        case SDVOB:
                ddc_reg = GPIOE;
                gma_encoder->ddi_select = DDI0_SELECT;
                break;
        case SDVOC:
                ddc_reg = GPIOD;
                gma_encoder->ddi_select = DDI1_SELECT;
                break;
        default:
                DRM_ERROR("unknown reg 0x%x for HDMI\n", reg);
                goto err_free_hdmi_priv;
        }

        ddc_bus = gma_i2c_create(dev, ddc_reg,
                                 (reg == SDVOB) ? "HDMIB" : "HDMIC");
        if (!ddc_bus) {
                dev_err(dev->dev, "No ddc adapter available!\n");
                goto err_free_hdmi_priv;
        }

        ret = drm_connector_init_with_ddc(dev, connector,
                                          &cdv_hdmi_connector_funcs,
                                          DRM_MODE_CONNECTOR_DVID,
                                          &ddc_bus->base);
        if (ret)
                goto err_ddc_destroy;

        ret = drm_simple_encoder_init(dev, &gma_encoder->base,
                                      DRM_MODE_ENCODER_TMDS);
        if (ret)
                goto err_connector_cleanup;

        gma_connector_attach_encoder(gma_connector, gma_encoder);
        gma_encoder->type = INTEL_OUTPUT_HDMI;
        hdmi_priv->hdmi_reg = reg;
        hdmi_priv->has_hdmi_sink = false;
        gma_encoder->dev_priv = hdmi_priv;

        drm_encoder_helper_add(&gma_encoder->base, &cdv_hdmi_helper_funcs);
        drm_connector_helper_add(connector,
                                 &cdv_hdmi_connector_helper_funcs);
        connector->display_info.subpixel_order = SubPixelHorizontalRGB;
        connector->interlace_allowed = false;
        connector->doublescan_allowed = false;

        drm_object_attach_property(&connector->base,
                                      dev->mode_config.scaling_mode_property,
                                      DRM_MODE_SCALE_FULLSCREEN);

        hdmi_priv->dev = dev;
        return;

err_connector_cleanup:
        drm_connector_cleanup(connector);
err_ddc_destroy:
        gma_i2c_destroy(ddc_bus);
err_free_hdmi_priv:
        kfree(hdmi_priv);
err_free_connector:
        kfree(gma_connector);
err_free_encoder:
        kfree(gma_encoder);
}