LXR linux/drivers/gpu/drm/gma500/psb_intel

   1/*
   2 * Copyright (c) 2007 Intel Corporation
   3 *
   4 * This program is free software; you can redistribute it and/or modify it
   5 * under the terms and conditions of the GNU General Public License,
   6 * version 2, as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope it will be useful, but WITHOUT
   9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11 * more details.
  12 *
  13 * You should have received a copy of the GNU General Public License along with
  14 * this program; if not, write to the Free Software Foundation, Inc.,
  15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16 *
  17 * Authers: Jesse Barnes <jesse.barnes@intel.com>
  18 */
  19
  20#include <linux/i2c.h>
  21#include <drm/drmP.h>
  22#include "psb_intel_drv.h"
  23
  24/**
  25 * psb_intel_ddc_probe
  26 *
  27 */
  28bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
  29{
  30        u8 out_buf[] = { 0x0, 0x0 };
  31        u8 buf[2];
  32        int ret;
  33        struct i2c_msg msgs[] = {
  34                {
  35                 .addr = 0x50,
  36                 .flags = 0,
  37                 .len = 1,
  38                 .buf = out_buf,
  39                 },
  40                {
  41                 .addr = 0x50,
  42                 .flags = I2C_M_RD,
  43                 .len = 1,
  44                 .buf = buf,
  45                 }
  46        };
  47
  48        ret = i2c_transfer(adapter, msgs, 2);
  49        if (ret == 2)
  50                return true;
  51
  52        return false;
  53}
  54
  55/**
  56 * psb_intel_ddc_get_modes - get modelist from monitor
  57 * @connector: DRM connector device to use
  58 *
  59 * Fetch the EDID information from @connector using the DDC bus.
  60 */
  61int psb_intel_ddc_get_modes(struct drm_connector *connector,
  62                            struct i2c_adapter *adapter)
  63{
  64        struct edid *edid;
  65        int ret = 0;
  66
  67        edid = drm_get_edid(connector, adapter);
  68        if (edid) {
  69                drm_connector_update_edid_property(connector, edid);
  70                ret = drm_add_edid_modes(connector, edid);
  71                kfree(edid);
  72        }
  73        return ret;
  74}
  75