LXR linux/drivers/gpu/drm/gma500/psb_intel

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2007 Intel Corporation
   4 *
   5 * Authers: Jesse Barnes <jesse.barnes@intel.com>
   6 */
   7
   8#include <linux/i2c.h>
   9
  10#include "psb_intel_drv.h"
  11
  12/**
  13 * psb_intel_ddc_probe
  14 * @adapter:   Associated I2C adaptor
  15 */
  16bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
  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(adapter, msgs, 2);
  37        if (ret == 2)
  38                return true;
  39
  40        return false;
  41}
  42
  43/**
  44 * psb_intel_ddc_get_modes - get modelist from monitor
  45 * @connector: DRM connector device to use
  46 * @adapter:   Associated I2C adaptor
  47 *
  48 * Fetch the EDID information from @connector using the DDC bus.
  49 */
  50int psb_intel_ddc_get_modes(struct drm_connector *connector,
  51                            struct i2c_adapter *adapter)
  52{
  53        struct edid *edid;
  54        int ret = 0;
  55
  56        edid = drm_get_edid(connector, adapter);
  57        if (edid) {
  58                drm_connector_update_edid_property(connector, edid);
  59                ret = drm_add_edid_modes(connector, edid);
  60                kfree(edid);
  61        }
  62        return ret;
  63}
  64