kernel/2.6.29.6-aldebaran-rt/drivers/gpu/drm/i915/intel_modes.c

   1 /*
   2  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   3  * Copyright (c) 2007 Intel Corporation
   4  *   Jesse Barnes <jesse.barnes@intel.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include <linux/i2c.h>
  27 #include <linux/fb.h>
  28 #include "drmP.h"
  29 #include "intel_drv.h"
  30
  31 /**
  32  * intel_ddc_probe
  33  *
  34  */
  35 bool intel_ddc_probe(struct intel_output *intel_output)
  36 {
  37         u8 out_buf[] = { 0x0, 0x0};
  38         u8 buf[2];
  39         int ret;
  40         struct i2c_msg msgs[] = {
  41                 {
  42                         .addr = 0x50,
  43                         .flags = 0,
  44                         .len = 1,
  45                         .buf = out_buf,
  46                 },
  47                 {
  48                         .addr = 0x50,
  49                         .flags = I2C_M_RD,
  50                         .len = 1,
  51                         .buf = buf,
  52                 }
  53         };
  54
  55         ret = i2c_transfer(&intel_output->ddc_bus->adapter, msgs, 2);
  56         if (ret == 2)
  57                 return true;
  58
  59         return false;
  60 }
  61
  62 /**
  63  * intel_ddc_get_modes - get modelist from monitor
  64  * @connector: DRM connector device to use
  65  *
  66  * Fetch the EDID information from @connector using the DDC bus.
  67  */
  68 int intel_ddc_get_modes(struct intel_output *intel_output)
  69 {
  70         struct edid *edid;
  71         int ret = 0;
  72
  73         edid = drm_get_edid(&intel_output->base,
  74                             &intel_output->ddc_bus->adapter);
  75         if (edid) {
  76                 drm_mode_connector_update_edid_property(&intel_output->base,
  77                                                         edid);
  78                 ret = drm_add_edid_modes(&intel_output->base, edid);
  79                 kfree(edid);
  80         }
  81
  82         return ret;
  83 }