/*
 * shmob_drm_crtc.c  --  SH Mobile DRM CRTCs
 *
 * Copyright (C) 2012 Renesas Corporation
 *
 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 *
 * 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.
 */

#include <linux/backlight.h>
#include <linux/clk.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>

#include <video/sh_mobile_meram.h>

#include "shmob_drm_backlight.h"
#include "shmob_drm_crtc.h"
#include "shmob_drm_drv.h"
#include "shmob_drm_kms.h"
#include "shmob_drm_plane.h"
#include "shmob_drm_regs.h"

/*
 * TODO: panel support
 */

/* -----------------------------------------------------------------------------
 * Clock management
 */

static void shmob_drm_clk_on(struct shmob_drm_device *sdev)
{
        if (sdev->clock)
                clk_enable(sdev->clock);
#if 0
        if (sdev->meram_dev && sdev->meram_dev->pdev)
                pm_runtime_get_sync(&sdev->meram_dev->pdev->dev);
#endif
}

static void shmob_drm_clk_off(struct shmob_drm_device *sdev)
{
#if 0
        if (sdev->meram_dev && sdev->meram_dev->pdev)
                pm_runtime_put_sync(&sdev->meram_dev->pdev->dev);
#endif
        if (sdev->clock)
                clk_disable(sdev->clock);
}

/* -----------------------------------------------------------------------------
 * CRTC
 */

static void shmob_drm_crtc_setup_geometry(struct shmob_drm_crtc *scrtc)
{
        struct drm_crtc *crtc = &scrtc->crtc;
        struct shmob_drm_device *sdev = crtc->dev->dev_private;
        const struct shmob_drm_interface_data *idata = &sdev->pdata->iface;
        const struct drm_display_mode *mode = &crtc->mode;
        u32 value;

        value = sdev->ldmt1r
              | ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? 0 : LDMT1R_VPOL)
              | ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? 0 : LDMT1R_HPOL)
              | ((idata->flags & SHMOB_DRM_IFACE_FL_DWPOL) ? LDMT1R_DWPOL : 0)
              | ((idata->flags & SHMOB_DRM_IFACE_FL_DIPOL) ? LDMT1R_DIPOL : 0)
              | ((idata->flags & SHMOB_DRM_IFACE_FL_DAPOL) ? LDMT1R_DAPOL : 0)
              | ((idata->flags & SHMOB_DRM_IFACE_FL_HSCNT) ? LDMT1R_HSCNT : 0)
              | ((idata->flags & SHMOB_DRM_IFACE_FL_DWCNT) ? LDMT1R_DWCNT : 0);
        lcdc_write(sdev, LDMT1R, value);

        if (idata->interface >= SHMOB_DRM_IFACE_SYS8A &&
            idata->interface <= SHMOB_DRM_IFACE_SYS24) {
                /* Setup SYS bus. */
                value = (idata->sys.cs_setup << LDMT2R_CSUP_SHIFT)
                      | (idata->sys.vsync_active_high ? LDMT2R_RSV : 0)
                      | (idata->sys.vsync_dir_input ? LDMT2R_VSEL : 0)
                      | (idata->sys.write_setup << LDMT2R_WCSC_SHIFT)
                      | (idata->sys.write_cycle << LDMT2R_WCEC_SHIFT)
                      | (idata->sys.write_strobe << LDMT2R_WCLW_SHIFT);
                lcdc_write(sdev, LDMT2R, value);

                value = (idata->sys.read_latch << LDMT3R_RDLC_SHIFT)
                      | (idata->sys.read_setup << LDMT3R_RCSC_SHIFT)
                      | (idata->sys.read_cycle << LDMT3R_RCEC_SHIFT)
                      | (idata->sys.read_strobe << LDMT3R_RCLW_SHIFT);
                lcdc_write(sdev, LDMT3R, value);
        }

        value = ((mode->hdisplay / 8) << 16)                    /* HDCN */
              | (mode->htotal / 8);                             /* HTCN */
        lcdc_write(sdev, LDHCNR, value);

        value = (((mode->hsync_end - mode->hsync_start) / 8) << 16) /* HSYNW */
              | (mode->hsync_start / 8);                        /* HSYNP */
        lcdc_write(sdev, LDHSYNR, value);

        value = ((mode->hdisplay & 7) << 24) | ((mode->htotal & 7) << 16)
              | (((mode->hsync_end - mode->hsync_start) & 7) << 8)
              | (mode->hsync_start & 7);
        lcdc_write(sdev, LDHAJR, value);

        value = ((mode->vdisplay) << 16)                        /* VDLN */
              | mode->vtotal;                                   /* VTLN */
        lcdc_write(sdev, LDVLNR, value);

        value = ((mode->vsync_end - mode->vsync_start) << 16)   /* VSYNW */
              | mode->vsync_start;                              /* VSYNP */
        lcdc_write(sdev, LDVSYNR, value);
}

static void shmob_drm_crtc_start_stop(struct shmob_drm_crtc *scrtc, bool start)
{
        struct shmob_drm_device *sdev = scrtc->crtc.dev->dev_private;
        u32 value;

        value = lcdc_read(sdev, LDCNT2R);
        if (start)
                lcdc_write(sdev, LDCNT2R, value | LDCNT2R_DO);
        else
                lcdc_write(sdev, LDCNT2R, value & ~LDCNT2R_DO);

        /* Wait until power is applied/stopped. */
        while (1) {
                value = lcdc_read(sdev, LDPMR) & LDPMR_LPS;
                if ((start && value) || (!start && !value))
                        break;

                cpu_relax();
        }

        if (!start) {
                /* Stop the dot clock. */
                lcdc_write(sdev, LDDCKSTPR, LDDCKSTPR_DCKSTP);
        }
}

/*
 * shmob_drm_crtc_start - Configure and start the LCDC
 * @scrtc: the SH Mobile CRTC
 *
 * Configure and start the LCDC device. External devices (clocks, MERAM, panels,
 * ...) are not touched by this function.
 */
static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc)
{
        struct drm_crtc *crtc = &scrtc->crtc;
        struct shmob_drm_device *sdev = crtc->dev->dev_private;
        const struct shmob_drm_interface_data *idata = &sdev->pdata->iface;
        const struct shmob_drm_format_info *format;
        struct drm_device *dev = sdev->ddev;
        struct drm_plane *plane;
        u32 value;

        if (scrtc->started)
                return;

        format = shmob_drm_format_info(crtc->fb->pixel_format);
        if (WARN_ON(format == NULL))
                return;

        /* Enable clocks before accessing the hardware. */
        shmob_drm_clk_on(sdev);

        /* Reset and enable the LCDC. */
        lcdc_write(sdev, LDCNT2R, lcdc_read(sdev, LDCNT2R) | LDCNT2R_BR);
        lcdc_wait_bit(sdev, LDCNT2R, LDCNT2R_BR, 0);
        lcdc_write(sdev, LDCNT2R, LDCNT2R_ME);

        /* Stop the LCDC first and disable all interrupts. */
        shmob_drm_crtc_start_stop(scrtc, false);
        lcdc_write(sdev, LDINTR, 0);

        /* Configure power supply, dot clocks and start them. */
        lcdc_write(sdev, LDPMR, 0);

        value = sdev->lddckr;
        if (idata->clk_div) {
                /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
                 * denominator.
                 */
                lcdc_write(sdev, LDDCKPAT1R, 0);
                lcdc_write(sdev, LDDCKPAT2R, (1 << (idata->clk_div / 2)) - 1);

                if (idata->clk_div == 1)
                        value |= LDDCKR_MOSEL;
                else
                        value |= idata->clk_div;
        }

        lcdc_write(sdev, LDDCKR, value);
        lcdc_write(sdev, LDDCKSTPR, 0);
        lcdc_wait_bit(sdev, LDDCKSTPR, ~0, 0);

        /* TODO: Setup SYS panel */

        /* Setup geometry, format, frame buffer memory and operation mode. */
        shmob_drm_crtc_setup_geometry(scrtc);

        /* TODO: Handle YUV colorspaces. Hardcode REC709 for now. */
        lcdc_write(sdev, LDDFR, format->lddfr | LDDFR_CF1);
        lcdc_write(sdev, LDMLSR, scrtc->line_size);
        lcdc_write(sdev, LDSA1R, scrtc->dma[0]);
        if (format->yuv)
                lcdc_write(sdev, LDSA2R, scrtc->dma[1]);
        lcdc_write(sdev, LDSM1R, 0);

        /* Word and long word swap. */
        switch (format->fourcc) {
        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_NV21:
        case DRM_FORMAT_NV61:
        case DRM_FORMAT_NV42:
                value = LDDDSR_LS | LDDDSR_WS;
                break;
        case DRM_FORMAT_RGB888:
        case DRM_FORMAT_NV12:
        case DRM_FORMAT_NV16:
        case DRM_FORMAT_NV24:
                value = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS;
                break;
        case DRM_FORMAT_ARGB8888:
        default:
                value = LDDDSR_LS;
                break;
        }
        lcdc_write(sdev, LDDDSR, value);

        /* Setup planes. */
        list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
                if (plane->crtc == crtc)
                        shmob_drm_plane_setup(plane);
        }

        /* Enable the display output. */
        lcdc_write(sdev, LDCNT1R, LDCNT1R_DE);

        shmob_drm_crtc_start_stop(scrtc, true);

        scrtc->started = true;
}

static void shmob_drm_crtc_stop(struct shmob_drm_crtc *scrtc)
{
        struct drm_crtc *crtc = &scrtc->crtc;
        struct shmob_drm_device *sdev = crtc->dev->dev_private;

        if (!scrtc->started)
                return;

        /* Disable the MERAM cache. */
        if (scrtc->cache) {
                sh_mobile_meram_cache_free(sdev->meram, scrtc->cache);
                scrtc->cache = NULL;
        }

        /* Stop the LCDC. */
        shmob_drm_crtc_start_stop(scrtc, false);

        /* Disable the display output. */
        lcdc_write(sdev, LDCNT1R, 0);

        /* Stop clocks. */
        shmob_drm_clk_off(sdev);

        scrtc->started = false;
}

void shmob_drm_crtc_suspend(struct shmob_drm_crtc *scrtc)
{
        shmob_drm_crtc_stop(scrtc);
}

void shmob_drm_crtc_resume(struct shmob_drm_crtc *scrtc)
{
        if (scrtc->dpms != DRM_MODE_DPMS_ON)
                return;

        shmob_drm_crtc_start(scrtc);
}

static void shmob_drm_crtc_compute_base(struct shmob_drm_crtc *scrtc,
                                        int x, int y)
{
        struct drm_crtc *crtc = &scrtc->crtc;
        struct drm_framebuffer *fb = crtc->fb;
        struct shmob_drm_device *sdev = crtc->dev->dev_private;
        struct drm_gem_cma_object *gem;
        unsigned int bpp;

        bpp = scrtc->format->yuv ? 8 : scrtc->format->bpp;
        gem = drm_fb_cma_get_gem_obj(fb, 0);
        scrtc->dma[0] = gem->paddr + fb->offsets[0]
                      + y * fb->pitches[0] + x * bpp / 8;

        if (scrtc->format->yuv) {
                bpp = scrtc->format->bpp - 8;
                gem = drm_fb_cma_get_gem_obj(fb, 1);
                scrtc->dma[1] = gem->paddr + fb->offsets[1]
                              + y / (bpp == 4 ? 2 : 1) * fb->pitches[1]
                              + x * (bpp == 16 ? 2 : 1);
        }

        if (scrtc->cache)
                sh_mobile_meram_cache_update(sdev->meram, scrtc->cache,
                                             scrtc->dma[0], scrtc->dma[1],
                                             &scrtc->dma[0], &scrtc->dma[1]);
}

static void shmob_drm_crtc_update_base(struct shmob_drm_crtc *scrtc)
{
        struct drm_crtc *crtc = &scrtc->crtc;
        struct shmob_drm_device *sdev = crtc->dev->dev_private;

        shmob_drm_crtc_compute_base(scrtc, crtc->x, crtc->y);

        lcdc_write_mirror(sdev, LDSA1R, scrtc->dma[0]);
        if (scrtc->format->yuv)
                lcdc_write_mirror(sdev, LDSA2R, scrtc->dma[1]);

        lcdc_write(sdev, LDRCNTR, lcdc_read(sdev, LDRCNTR) ^ LDRCNTR_MRS);
}

#define to_shmob_crtc(c)        container_of(c, struct shmob_drm_crtc, crtc)

static void shmob_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
{
        struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);

        if (scrtc->dpms == mode)
                return;

        if (mode == DRM_MODE_DPMS_ON)
                shmob_drm_crtc_start(scrtc);
        else
                shmob_drm_crtc_stop(scrtc);

        scrtc->dpms = mode;
}

static bool shmob_drm_crtc_mode_fixup(struct drm_crtc *crtc,
                                      const struct drm_display_mode *mode,
                                      struct drm_display_mode *adjusted_mode)
{
        return true;
}

static void shmob_drm_crtc_mode_prepare(struct drm_crtc *crtc)
{
        shmob_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
}

static int shmob_drm_crtc_mode_set(struct drm_crtc *crtc,
                                   struct drm_display_mode *mode,
                                   struct drm_display_mode *adjusted_mode,
                                   int x, int y,
                                   struct drm_framebuffer *old_fb)
{
        struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
        struct shmob_drm_device *sdev = crtc->dev->dev_private;
        const struct sh_mobile_meram_cfg *mdata = sdev->pdata->meram;
        const struct shmob_drm_format_info *format;
        void *cache;

        format = shmob_drm_format_info(crtc->fb->pixel_format);
        if (format == NULL) {
                dev_dbg(sdev->dev, "mode_set: unsupported format %08x\n",
                        crtc->fb->pixel_format);
                return -EINVAL;
        }

        scrtc->format = format;
        scrtc->line_size = crtc->fb->pitches[0];

        if (sdev->meram) {
                /* Enable MERAM cache if configured. We need to de-init
                 * configured ICBs before we can re-initialize them.
                 */
                if (scrtc->cache) {
                        sh_mobile_meram_cache_free(sdev->meram, scrtc->cache);
                        scrtc->cache = NULL;
                }

                cache = sh_mobile_meram_cache_alloc(sdev->meram, mdata,
                                                    crtc->fb->pitches[0],
                                                    adjusted_mode->vdisplay,
                                                    format->meram,
                                                    &scrtc->line_size);
                if (!IS_ERR(cache))
                        scrtc->cache = cache;
        }

        shmob_drm_crtc_compute_base(scrtc, x, y);

        return 0;
}

static void shmob_drm_crtc_mode_commit(struct drm_crtc *crtc)
{
        shmob_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
}

static int shmob_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
                                        struct drm_framebuffer *old_fb)
{
        shmob_drm_crtc_update_base(to_shmob_crtc(crtc));

        return 0;
}

static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
        .dpms = shmob_drm_crtc_dpms,
        .mode_fixup = shmob_drm_crtc_mode_fixup,
        .prepare = shmob_drm_crtc_mode_prepare,
        .commit = shmob_drm_crtc_mode_commit,
        .mode_set = shmob_drm_crtc_mode_set,
        .mode_set_base = shmob_drm_crtc_mode_set_base,
};

void shmob_drm_crtc_cancel_page_flip(struct shmob_drm_crtc *scrtc,
                                     struct drm_file *file)
{
        struct drm_pending_vblank_event *event;
        struct drm_device *dev = scrtc->crtc.dev;
        unsigned long flags;

        /* Destroy the pending vertical blanking event associated with the
         * pending page flip, if any, and disable vertical blanking interrupts.
         */
        spin_lock_irqsave(&dev->event_lock, flags);
        event = scrtc->event;
        if (event && event->base.file_priv == file) {
                scrtc->event = NULL;
                event->base.destroy(&event->base);
                drm_vblank_put(dev, 0);
        }
        spin_unlock_irqrestore(&dev->event_lock, flags);
}

void shmob_drm_crtc_finish_page_flip(struct shmob_drm_crtc *scrtc)
{
        struct drm_pending_vblank_event *event;
        struct drm_device *dev = scrtc->crtc.dev;
        unsigned long flags;

        spin_lock_irqsave(&dev->event_lock, flags);
        event = scrtc->event;
        scrtc->event = NULL;
        if (event) {
                drm_send_vblank_event(dev, 0, event);
                drm_vblank_put(dev, 0);
        }
        spin_unlock_irqrestore(&dev->event_lock, flags);
}

static int shmob_drm_crtc_page_flip(struct drm_crtc *crtc,
                                    struct drm_framebuffer *fb,
                                    struct drm_pending_vblank_event *event,
                                    uint32_t page_flip_flags)
{
        struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
        struct drm_device *dev = scrtc->crtc.dev;
        unsigned long flags;

        spin_lock_irqsave(&dev->event_lock, flags);
        if (scrtc->event != NULL) {
                spin_unlock_irqrestore(&dev->event_lock, flags);
                return -EBUSY;
        }
        spin_unlock_irqrestore(&dev->event_lock, flags);

        crtc->fb = fb;
        shmob_drm_crtc_update_base(scrtc);

        if (event) {
                event->pipe = 0;
                drm_vblank_get(dev, 0);
                spin_lock_irqsave(&dev->event_lock, flags);
                scrtc->event = event;
                spin_unlock_irqrestore(&dev->event_lock, flags);
        }

        return 0;
}

static const struct drm_crtc_funcs crtc_funcs = {
        .destroy = drm_crtc_cleanup,
        .set_config = drm_crtc_helper_set_config,
        .page_flip = shmob_drm_crtc_page_flip,
};

int shmob_drm_crtc_create(struct shmob_drm_device *sdev)
{
        struct drm_crtc *crtc = &sdev->crtc.crtc;
        int ret;

        sdev->crtc.dpms = DRM_MODE_DPMS_OFF;

        ret = drm_crtc_init(sdev->ddev, crtc, &crtc_funcs);
        if (ret < 0)
                return ret;

        drm_crtc_helper_add(crtc, &crtc_helper_funcs);

        return 0;
}

/* -----------------------------------------------------------------------------
 * Encoder
 */

#define to_shmob_encoder(e) \
        container_of(e, struct shmob_drm_encoder, encoder)

static void shmob_drm_encoder_dpms(struct drm_encoder *encoder, int mode)
{
        struct shmob_drm_encoder *senc = to_shmob_encoder(encoder);
        struct shmob_drm_device *sdev = encoder->dev->dev_private;
        struct shmob_drm_connector *scon = &sdev->connector;

        if (senc->dpms == mode)
                return;

        shmob_drm_backlight_dpms(scon, mode);

        senc->dpms = mode;
}

static bool shmob_drm_encoder_mode_fixup(struct drm_encoder *encoder,
                                         const struct drm_display_mode *mode,
                                         struct drm_display_mode *adjusted_mode)
{
        struct drm_device *dev = encoder->dev;
        struct shmob_drm_device *sdev = dev->dev_private;
        struct drm_connector *connector = &sdev->connector.connector;
        const struct drm_display_mode *panel_mode;

        if (list_empty(&connector->modes)) {
                dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
                return false;
        }

        /* The flat panel mode is fixed, just copy it to the adjusted mode. */
        panel_mode = list_first_entry(&connector->modes,
                                      struct drm_display_mode, head);
        drm_mode_copy(adjusted_mode, panel_mode);

        return true;
}

static void shmob_drm_encoder_mode_prepare(struct drm_encoder *encoder)
{
        /* No-op, everything is handled in the CRTC code. */
}

static void shmob_drm_encoder_mode_set(struct drm_encoder *encoder,
                                       struct drm_display_mode *mode,
                                       struct drm_display_mode *adjusted_mode)
{
        /* No-op, everything is handled in the CRTC code. */
}

static void shmob_drm_encoder_mode_commit(struct drm_encoder *encoder)
{
        /* No-op, everything is handled in the CRTC code. */
}

static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
        .dpms = shmob_drm_encoder_dpms,
        .mode_fixup = shmob_drm_encoder_mode_fixup,
        .prepare = shmob_drm_encoder_mode_prepare,
        .commit = shmob_drm_encoder_mode_commit,
        .mode_set = shmob_drm_encoder_mode_set,
};

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

static const struct drm_encoder_funcs encoder_funcs = {
        .destroy = shmob_drm_encoder_destroy,
};

int shmob_drm_encoder_create(struct shmob_drm_device *sdev)
{
        struct drm_encoder *encoder = &sdev->encoder.encoder;
        int ret;

        sdev->encoder.dpms = DRM_MODE_DPMS_OFF;

        encoder->possible_crtcs = 1;

        ret = drm_encoder_init(sdev->ddev, encoder, &encoder_funcs,
                               DRM_MODE_ENCODER_LVDS);
        if (ret < 0)
                return ret;

        drm_encoder_helper_add(encoder, &encoder_helper_funcs);

        return 0;
}

void shmob_drm_crtc_enable_vblank(struct shmob_drm_device *sdev, bool enable)
{
        unsigned long flags;
        u32 ldintr;

        /* Be careful not to acknowledge any pending interrupt. */
        spin_lock_irqsave(&sdev->irq_lock, flags);
        ldintr = lcdc_read(sdev, LDINTR) | LDINTR_STATUS_MASK;
        if (enable)
                ldintr |= LDINTR_VEE;
        else
                ldintr &= ~LDINTR_VEE;
        lcdc_write(sdev, LDINTR, ldintr);
        spin_unlock_irqrestore(&sdev->irq_lock, flags);
}

/* -----------------------------------------------------------------------------
 * Connector
 */

#define to_shmob_connector(c) \
        container_of(c, struct shmob_drm_connector, connector)

static int shmob_drm_connector_get_modes(struct drm_connector *connector)
{
        struct shmob_drm_device *sdev = connector->dev->dev_private;
        struct drm_display_mode *mode;

        mode = drm_mode_create(connector->dev);
        if (mode == NULL)
                return 0;

        mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
        mode->clock = sdev->pdata->panel.mode.clock;
        mode->hdisplay = sdev->pdata->panel.mode.hdisplay;
        mode->hsync_start = sdev->pdata->panel.mode.hsync_start;
        mode->hsync_end = sdev->pdata->panel.mode.hsync_end;
        mode->htotal = sdev->pdata->panel.mode.htotal;
        mode->vdisplay = sdev->pdata->panel.mode.vdisplay;
        mode->vsync_start = sdev->pdata->panel.mode.vsync_start;
        mode->vsync_end = sdev->pdata->panel.mode.vsync_end;
        mode->vtotal = sdev->pdata->panel.mode.vtotal;
        mode->flags = sdev->pdata->panel.mode.flags;

        drm_mode_set_name(mode);
        drm_mode_probed_add(connector, mode);

        connector->display_info.width_mm = sdev->pdata->panel.width_mm;
        connector->display_info.height_mm = sdev->pdata->panel.height_mm;

        return 1;
}

static int shmob_drm_connector_mode_valid(struct drm_connector *connector,
                                          struct drm_display_mode *mode)
{
        return MODE_OK;
}

static struct drm_encoder *
shmob_drm_connector_best_encoder(struct drm_connector *connector)
{
        struct shmob_drm_connector *scon = to_shmob_connector(connector);

        return scon->encoder;
}

static const struct drm_connector_helper_funcs connector_helper_funcs = {
        .get_modes = shmob_drm_connector_get_modes,
        .mode_valid = shmob_drm_connector_mode_valid,
        .best_encoder = shmob_drm_connector_best_encoder,
};

static void shmob_drm_connector_destroy(struct drm_connector *connector)
{
        struct shmob_drm_connector *scon = to_shmob_connector(connector);

        shmob_drm_backlight_exit(scon);
        drm_sysfs_connector_remove(connector);
        drm_connector_cleanup(connector);
}

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

static const struct drm_connector_funcs connector_funcs = {
        .dpms = drm_helper_connector_dpms,
        .detect = shmob_drm_connector_detect,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .destroy = shmob_drm_connector_destroy,
};

int shmob_drm_connector_create(struct shmob_drm_device *sdev,
                               struct drm_encoder *encoder)
{
        struct drm_connector *connector = &sdev->connector.connector;
        int ret;

        sdev->connector.encoder = encoder;

        connector->display_info.width_mm = sdev->pdata->panel.width_mm;
        connector->display_info.height_mm = sdev->pdata->panel.height_mm;

        ret = drm_connector_init(sdev->ddev, connector, &connector_funcs,
                                 DRM_MODE_CONNECTOR_LVDS);
        if (ret < 0)
                return ret;

        drm_connector_helper_add(connector, &connector_helper_funcs);
        ret = drm_sysfs_connector_add(connector);
        if (ret < 0)
                goto err_cleanup;

        ret = shmob_drm_backlight_init(&sdev->connector);
        if (ret < 0)
                goto err_sysfs;

        ret = drm_mode_connector_attach_encoder(connector, encoder);
        if (ret < 0)
                goto err_backlight;

        connector->encoder = encoder;

        drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
        drm_object_property_set_value(&connector->base,
                sdev->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);

        return 0;

err_backlight:
        shmob_drm_backlight_exit(&sdev->connector);
err_sysfs:
        drm_sysfs_connector_remove(connector);
err_cleanup:
        drm_connector_cleanup(connector);
        return ret;
}