linux-core/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
   7 #include <linux/i2c.h>
   8 #include <linux/fb.h>
   9 #include "drmP.h"
  10 #include "intel_drv.h"
  11
  12 /**
  13  * intel_ddc_probe
  14  *
  15  */
  16 bool intel_ddc_probe(struct intel_output *intel_output)
  17 {
  18         u8 out_buf[] = { 0x0, 0x0};
  19         u8 buf[2];
  20         int ret;
  21         struct i2c_msg msgs[] = {
  22                 {
  23                         .addr = 0x50,
  24                         .flags = 0,
  25                         .len = 1,
  26                         .buf = out_buf,
  27                 },
  28                 {
  29                         .addr = 0x50,
  30                         .flags = I2C_M_RD,
  31                         .len = 1,
  32                         .buf = buf,
  33                 }
  34         };
  35
  36         ret = i2c_transfer(&intel_output->ddc_bus->adapter, msgs, 2);
  37         if (ret == 2)
  38                 return true;
  39
  40         return false;
  41 }
  42
  43 /**
  44  * intel_ddc_get_modes - get modelist from monitor
  45  * @connector: DRM connector device to use
  46  *
  47  * Fetch the EDID information from @connector using the DDC bus.
  48  */
  49 int intel_ddc_get_modes(struct intel_output *intel_output)
  50 {
  51         struct edid *edid;
  52         int ret = 0;
  53
  54         edid = drm_get_edid(&intel_output->base, &intel_output->ddc_bus->adapter);
  55         if (edid) {
  56                 drm_mode_connector_update_edid_property(&intel_output->base, edid);
  57                 ret = drm_add_edid_modes(&intel_output->base, edid);
  58                 kfree(edid);
  59         }
  60         return ret;
  61 }