drivers/staging/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 <linux/fb.h>
  22 #include <drm/drmP.h>
  23 #include "psb_intel_drv.h"
  24
  25 /**
  26  * psb_intel_ddc_probe
  27  *
  28  */
  29 bool psb_intel_ddc_probe(struct psb_intel_output *psb_intel_output)
  30 {
  31         u8 out_buf[] = { 0x0, 0x0 };
  32         u8 buf[2];
  33         int ret;
  34         struct i2c_msg msgs[] = {
  35                 {
  36                  .addr = 0x50,
  37                  .flags = 0,
  38                  .len = 1,
  39                  .buf = out_buf,
  40                  },
  41                 {
  42                  .addr = 0x50,
  43                  .flags = I2C_M_RD,
  44                  .len = 1,
  45                  .buf = buf,
  46                  }
  47         };
  48
  49         ret = i2c_transfer(&psb_intel_output->ddc_bus->adapter, msgs, 2);
  50         if (ret == 2)
  51                 return true;
  52
  53         return false;
  54 }
  55
  56 /**
  57  * psb_intel_ddc_get_modes - get modelist from monitor
  58  * @connector: DRM connector device to use
  59  *
  60  * Fetch the EDID information from @connector using the DDC bus.
  61  */
  62 int psb_intel_ddc_get_modes(struct psb_intel_output *psb_intel_output)
  63 {
  64         struct edid *edid;
  65         int ret = 0;
  66
  67         edid =
  68             drm_get_edid(&psb_intel_output->base,
  69                          &psb_intel_output->ddc_bus->adapter);
  70         if (edid) {
  71                 drm_mode_connector_update_edid_property(&psb_intel_output->
  72                                                         base, edid);
  73                 ret = drm_add_edid_modes(&psb_intel_output->base, edid);
  74                 kfree(edid);
  75         }
  76         return ret;
  77 }