psb_intel_modes.c

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/*
 * Copyright (c) 2007 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Authers: Jesse Barnes <[email protected]>
 */

#include <linux/i2c.h>
#include <linux/fb.h>
#include <drm/drmP.h>
#include "psb_intel_drv.h"

bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
{
    u8 out_buf[] = { 0x0, 0x0 };
    u8 buf[2];
    int ret;
    struct i2c_msg msgs[] = {
        {
         .addr = 0x50,
         .flags = 0,
         .len = 1,
         .buf = out_buf,
         },
        {
         .addr = 0x50,
         .flags = I2C_M_RD,
         .len = 1,
         .buf = buf,
         }
    };

    ret = i2c_transfer(adapter, msgs, 2);
    if (ret == 2)
        return true;

    return false;
}

int psb_intel_ddc_get_modes(struct drm_connector *connector,
                struct i2c_adapter *adapter)
{
    struct edid *edid;
    int ret = 0;

    edid = drm_get_edid(connector, adapter);
    if (edid) {
        drm_mode_connector_update_edid_property(connector, edid);
        ret = drm_add_edid_modes(connector, edid);
        kfree(edid);
    }
    return ret;
}