drivers/gpu/drm/gma500/psb_intel_modes.c

   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  */
  28 bool 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  */
  61 int 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 }