/*
 * Copyright 2006 Dave Airlie <airlied@linux.ie>
 * Copyright © 2006-2007 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:
 *      Eric Anholt <eric@anholt.net>
 */
#include <linux/i2c.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include "dvo.h"

#define SIL164_ADDR     0x38
#define CH7xxx_ADDR     0x76
#define TFP410_ADDR     0x38

static struct intel_dvo_device intel_dvo_devices[] = {
        {
                .type = INTEL_DVO_CHIP_TMDS,
                .name = "sil164",
                .dvo_reg = DVOC,
                .slave_addr = SIL164_ADDR,
                .dev_ops = &sil164_ops,
        },
        {
                .type = INTEL_DVO_CHIP_TMDS,
                .name = "ch7xxx",
                .dvo_reg = DVOC,
                .slave_addr = CH7xxx_ADDR,
                .dev_ops = &ch7xxx_ops,
        },
        {
                .type = INTEL_DVO_CHIP_LVDS,
                .name = "ivch",
                .dvo_reg = DVOA,
                .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
                .dev_ops = &ivch_ops,
        },
        {
                .type = INTEL_DVO_CHIP_TMDS,
                .name = "tfp410",
                .dvo_reg = DVOC,
                .slave_addr = TFP410_ADDR,
                .dev_ops = &tfp410_ops,
        },
        {
                .type = INTEL_DVO_CHIP_LVDS,
                .name = "ch7017",
                .dvo_reg = DVOC,
                .slave_addr = 0x75,
                .gpio = GPIOE,
                .dev_ops = &ch7017_ops,
        }
};

static void intel_dvo_dpms(struct drm_encoder *encoder, int mode)
{
        struct drm_i915_private *dev_priv = encoder->dev->dev_private;
        struct intel_output *intel_output = enc_to_intel_output(encoder);
        struct intel_dvo_device *dvo = intel_output->dev_priv;
        u32 dvo_reg = dvo->dvo_reg;
        u32 temp = I915_READ(dvo_reg);

        if (mode == DRM_MODE_DPMS_ON) {
                I915_WRITE(dvo_reg, temp | DVO_ENABLE);
                I915_READ(dvo_reg);
                dvo->dev_ops->dpms(dvo, mode);
        } else {
                dvo->dev_ops->dpms(dvo, mode);
                I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
                I915_READ(dvo_reg);
        }
}

static void intel_dvo_save(struct drm_connector *connector)
{
        struct drm_i915_private *dev_priv = connector->dev->dev_private;
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_dvo_device *dvo = intel_output->dev_priv;

        /* Each output should probably just save the registers it touches,
         * but for now, use more overkill.
         */
        dev_priv->saveDVOA = I915_READ(DVOA);
        dev_priv->saveDVOB = I915_READ(DVOB);
        dev_priv->saveDVOC = I915_READ(DVOC);

        dvo->dev_ops->save(dvo);
}

static void intel_dvo_restore(struct drm_connector *connector)
{
        struct drm_i915_private *dev_priv = connector->dev->dev_private;
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_dvo_device *dvo = intel_output->dev_priv;

        dvo->dev_ops->restore(dvo);

        I915_WRITE(DVOA, dev_priv->saveDVOA);
        I915_WRITE(DVOB, dev_priv->saveDVOB);
        I915_WRITE(DVOC, dev_priv->saveDVOC);
}

static int intel_dvo_mode_valid(struct drm_connector *connector,
                                struct drm_display_mode *mode)
{
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_dvo_device *dvo = intel_output->dev_priv;

        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
                return MODE_NO_DBLESCAN;

        /* XXX: Validate clock range */

        if (dvo->panel_fixed_mode) {
                if (mode->hdisplay > dvo->panel_fixed_mode->hdisplay)
                        return MODE_PANEL;
                if (mode->vdisplay > dvo->panel_fixed_mode->vdisplay)
                        return MODE_PANEL;
        }

        return dvo->dev_ops->mode_valid(dvo, mode);
}

static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
                                 struct drm_display_mode *mode,
                                 struct drm_display_mode *adjusted_mode)
{
        struct intel_output *intel_output = enc_to_intel_output(encoder);
        struct intel_dvo_device *dvo = intel_output->dev_priv;

        /* If we have timings from the BIOS for the panel, put them in
         * to the adjusted mode.  The CRTC will be set up for this mode,
         * with the panel scaling set up to source from the H/VDisplay
         * of the original mode.
         */
        if (dvo->panel_fixed_mode != NULL) {
#define C(x) adjusted_mode->x = dvo->panel_fixed_mode->x
                C(hdisplay);
                C(hsync_start);
                C(hsync_end);
                C(htotal);
                C(vdisplay);
                C(vsync_start);
                C(vsync_end);
                C(vtotal);
                C(clock);
                drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
#undef C
        }

        if (dvo->dev_ops->mode_fixup)
                return dvo->dev_ops->mode_fixup(dvo, mode, adjusted_mode);

        return true;
}

static void intel_dvo_mode_set(struct drm_encoder *encoder,
                               struct drm_display_mode *mode,
                               struct drm_display_mode *adjusted_mode)
{
        struct drm_device *dev = encoder->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
        struct intel_output *intel_output = enc_to_intel_output(encoder);
        struct intel_dvo_device *dvo = intel_output->dev_priv;
        int pipe = intel_crtc->pipe;
        u32 dvo_val;
        u32 dvo_reg = dvo->dvo_reg, dvo_srcdim_reg;
        int dpll_reg = (pipe == 0) ? DPLL_A : DPLL_B;

        switch (dvo_reg) {
        case DVOA:
        default:
                dvo_srcdim_reg = DVOA_SRCDIM;
                break;
        case DVOB:
                dvo_srcdim_reg = DVOB_SRCDIM;
                break;
        case DVOC:
                dvo_srcdim_reg = DVOC_SRCDIM;
                break;
        }

        dvo->dev_ops->mode_set(dvo, mode, adjusted_mode);

        /* Save the data order, since I don't know what it should be set to. */
        dvo_val = I915_READ(dvo_reg) &
                  (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
        dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
                   DVO_BLANK_ACTIVE_HIGH;

        if (pipe == 1)
                dvo_val |= DVO_PIPE_B_SELECT;
        dvo_val |= DVO_PIPE_STALL;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                dvo_val |= DVO_VSYNC_ACTIVE_HIGH;

        I915_WRITE(dpll_reg, I915_READ(dpll_reg) | DPLL_DVO_HIGH_SPEED);

        /*I915_WRITE(DVOB_SRCDIM,
          (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
          (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
        I915_WRITE(dvo_srcdim_reg,
                   (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
                   (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
        /*I915_WRITE(DVOB, dvo_val);*/
        I915_WRITE(dvo_reg, dvo_val);
}

/**
 * Detect the output connection on our DVO device.
 *
 * Unimplemented.
 */
static enum drm_connector_status intel_dvo_detect(struct drm_connector *connector)
{
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_dvo_device *dvo = intel_output->dev_priv;

        return dvo->dev_ops->detect(dvo);
}

static int intel_dvo_get_modes(struct drm_connector *connector)
{
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_dvo_device *dvo = intel_output->dev_priv;

        /* We should probably have an i2c driver get_modes function for those
         * devices which will have a fixed set of modes determined by the chip
         * (TV-out, for example), but for now with just TMDS and LVDS,
         * that's not the case.
         */
        intel_ddc_get_modes(intel_output);
        if (!list_empty(&connector->probed_modes))
                return 1;


        if (dvo->panel_fixed_mode != NULL) {
                struct drm_display_mode *mode;
                mode = drm_mode_duplicate(connector->dev, dvo->panel_fixed_mode);
                if (mode) {
                        drm_mode_probed_add(connector, mode);
                        return 1;
                }
        }
        return 0;
}

static void intel_dvo_destroy (struct drm_connector *connector)
{
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_dvo_device *dvo = intel_output->dev_priv;

        if (dvo) {
                if (dvo->dev_ops->destroy)
                        dvo->dev_ops->destroy(dvo);
                if (dvo->panel_fixed_mode)
                        kfree(dvo->panel_fixed_mode);
                /* no need, in i830_dvoices[] now */
                //kfree(dvo);
        }
        if (intel_output->i2c_bus)
                intel_i2c_destroy(intel_output->i2c_bus);
        if (intel_output->ddc_bus)
                intel_i2c_destroy(intel_output->ddc_bus);
        drm_sysfs_connector_remove(connector);
        drm_connector_cleanup(connector);
        kfree(intel_output);
}

#ifdef RANDR_GET_CRTC_INTERFACE
static struct drm_crtc *intel_dvo_get_crtc(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_dvo_device *dvo = intel_output->dev_priv;
        int pipe = !!(I915_READ(dvo->dvo_reg) & SDVO_PIPE_B_SELECT);

        return intel_pipe_to_crtc(pScrn, pipe);
}
#endif

static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
        .dpms = intel_dvo_dpms,
        .mode_fixup = intel_dvo_mode_fixup,
        .prepare = intel_encoder_prepare,
        .mode_set = intel_dvo_mode_set,
        .commit = intel_encoder_commit,
};

static const struct drm_connector_funcs intel_dvo_connector_funcs = {
        .dpms = drm_helper_connector_dpms,
        .save = intel_dvo_save,
        .restore = intel_dvo_restore,
        .detect = intel_dvo_detect,
        .destroy = intel_dvo_destroy,
        .fill_modes = drm_helper_probe_single_connector_modes,
};

static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
        .mode_valid = intel_dvo_mode_valid,
        .get_modes = intel_dvo_get_modes,
        .best_encoder = intel_best_encoder,
};

static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
{
        drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
        .destroy = intel_dvo_enc_destroy,
};


/**
 * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 *
 * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 * chip being on DVOB/C and having multiple pipes.
 */
static struct drm_display_mode *
intel_dvo_get_current_mode (struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_output *intel_output = to_intel_output(connector);
        struct intel_dvo_device *dvo = intel_output->dev_priv;
        uint32_t dvo_reg = dvo->dvo_reg;
        uint32_t dvo_val = I915_READ(dvo_reg);
        struct drm_display_mode *mode = NULL;

        /* If the DVO port is active, that'll be the LVDS, so we can pull out
         * its timings to get how the BIOS set up the panel.
         */
        if (dvo_val & DVO_ENABLE) {
                struct drm_crtc *crtc;
                int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;

                crtc = intel_get_crtc_from_pipe(dev, pipe);
                if (crtc) {
                        mode = intel_crtc_mode_get(dev, crtc);

                        if (mode) {
                                mode->type |= DRM_MODE_TYPE_PREFERRED;
                                if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
                                        mode->flags |= DRM_MODE_FLAG_PHSYNC;
                                if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
                                        mode->flags |= DRM_MODE_FLAG_PVSYNC;
                        }
                }
        }
        return mode;
}

void intel_dvo_init(struct drm_device *dev)
{
        struct intel_output *intel_output;
        struct intel_dvo_device *dvo;
        struct i2c_adapter *i2cbus = NULL;
        int ret = 0;
        int i;
        int encoder_type = DRM_MODE_ENCODER_NONE;
        intel_output = kzalloc (sizeof(struct intel_output), GFP_KERNEL);
        if (!intel_output)
                return;

        /* Set up the DDC bus */
        intel_output->ddc_bus = intel_i2c_create(dev, GPIOD, "DVODDC_D");
        if (!intel_output->ddc_bus)
                goto free_intel;

        /* Now, try to find a controller */
        for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
                struct drm_connector *connector = &intel_output->base;
                int gpio;

                dvo = &intel_dvo_devices[i];

                /* Allow the I2C driver info to specify the GPIO to be used in
                 * special cases, but otherwise default to what's defined
                 * in the spec.
                 */
                if (dvo->gpio != 0)
                        gpio = dvo->gpio;
                else if (dvo->type == INTEL_DVO_CHIP_LVDS)
                        gpio = GPIOB;
                else
                        gpio = GPIOE;

                /* Set up the I2C bus necessary for the chip we're probing.
                 * It appears that everything is on GPIOE except for panels
                 * on i830 laptops, which are on GPIOB (DVOA).
                 */
                if (i2cbus != NULL)
                        intel_i2c_destroy(i2cbus);
                if (!(i2cbus = intel_i2c_create(dev, gpio,
                        gpio == GPIOB ? "DVOI2C_B" : "DVOI2C_E"))) {
                        continue;
                }

                if (dvo->dev_ops!= NULL)
                        ret = dvo->dev_ops->init(dvo, i2cbus);
                else
                        ret = false;

                if (!ret)
                        continue;

                intel_output->type = INTEL_OUTPUT_DVO;
                intel_output->crtc_mask = (1 << 0) | (1 << 1);
                switch (dvo->type) {
                case INTEL_DVO_CHIP_TMDS:
                        intel_output->clone_mask =
                                (1 << INTEL_DVO_TMDS_CLONE_BIT) |
                                (1 << INTEL_ANALOG_CLONE_BIT);
                        drm_connector_init(dev, connector,
                                           &intel_dvo_connector_funcs,
                                           DRM_MODE_CONNECTOR_DVII);
                        encoder_type = DRM_MODE_ENCODER_TMDS;
                        break;
                case INTEL_DVO_CHIP_LVDS:
                        intel_output->clone_mask =
                                (1 << INTEL_DVO_LVDS_CLONE_BIT);
                        drm_connector_init(dev, connector,
                                           &intel_dvo_connector_funcs,
                                           DRM_MODE_CONNECTOR_LVDS);
                        encoder_type = DRM_MODE_ENCODER_LVDS;
                        break;
                }

                drm_connector_helper_add(connector,
                                         &intel_dvo_connector_helper_funcs);
                connector->display_info.subpixel_order = SubPixelHorizontalRGB;
                connector->interlace_allowed = false;
                connector->doublescan_allowed = false;

                intel_output->dev_priv = dvo;
                intel_output->i2c_bus = i2cbus;

                drm_encoder_init(dev, &intel_output->enc,
                                 &intel_dvo_enc_funcs, encoder_type);
                drm_encoder_helper_add(&intel_output->enc,
                                       &intel_dvo_helper_funcs);

                drm_mode_connector_attach_encoder(&intel_output->base,
                                                  &intel_output->enc);
                if (dvo->type == INTEL_DVO_CHIP_LVDS) {
                        /* For our LVDS chipsets, we should hopefully be able
                         * to dig the fixed panel mode out of the BIOS data.
                         * However, it's in a different format from the BIOS
                         * data on chipsets with integrated LVDS (stored in AIM
                         * headers, likely), so for now, just get the current
                         * mode being output through DVO.
                         */
                        dvo->panel_fixed_mode =
                                intel_dvo_get_current_mode(connector);
                        dvo->panel_wants_dither = true;
                }

                drm_sysfs_connector_add(connector);
                return;
        }

        intel_i2c_destroy(intel_output->ddc_bus);
        /* Didn't find a chip, so tear down. */
        if (i2cbus != NULL)
                intel_i2c_destroy(i2cbus);
free_intel:
        kfree(intel_output);
}