release/src-rt-6.x.4708/linux/linux-2.6.36/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/slab.h>
  27 #include <linux/i2c.h>
  28 #include <linux/fb.h>
  29 #include "drmP.h"
  30 #include "intel_drv.h"
  31 #include "i915_drv.h"
  32
  33 /**
  34  * intel_ddc_probe
  35  *
  36  */
  37 bool intel_ddc_probe(struct intel_encoder *intel_encoder)
  38 {
  39         u8 out_buf[] = { 0x0, 0x0};
  40         u8 buf[2];
  41         int ret;
  42         struct i2c_msg msgs[] = {
  43                 {
  44                         .addr = 0x50,
  45                         .flags = 0,
  46                         .len = 1,
  47                         .buf = out_buf,
  48                 },
  49                 {
  50                         .addr = 0x50,
  51                         .flags = I2C_M_RD,
  52                         .len = 1,
  53                         .buf = buf,
  54                 }
  55         };
  56
  57         intel_i2c_quirk_set(intel_encoder->enc.dev, true);
  58         ret = i2c_transfer(intel_encoder->ddc_bus, msgs, 2);
  59         intel_i2c_quirk_set(intel_encoder->enc.dev, false);
  60         if (ret == 2)
  61                 return true;
  62
  63         return false;
  64 }
  65
  66 /**
  67  * intel_ddc_get_modes - get modelist from monitor
  68  * @connector: DRM connector device to use
  69  * @adapter: i2c adapter
  70  *
  71  * Fetch the EDID information from @connector using the DDC bus.
  72  */
  73 int intel_ddc_get_modes(struct drm_connector *connector,
  74                         struct i2c_adapter *adapter)
  75 {
  76         struct edid *edid;
  77         int ret = 0;
  78
  79         intel_i2c_quirk_set(connector->dev, true);
  80         edid = drm_get_edid(connector, adapter);
  81         intel_i2c_quirk_set(connector->dev, false);
  82         if (edid) {
  83                 drm_mode_connector_update_edid_property(connector, edid);
  84                 ret = drm_add_edid_modes(connector, edid);
  85                 connector->display_info.raw_edid = NULL;
  86                 kfree(edid);
  87         }
  88
  89         return ret;
  90 }