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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2007 Intel Corporation4 *5 * Authers: Jesse Barnes <jesse.barnes@intel.com>6 */7 8#include <linux/i2c.h>9 10#include <drm/drm_edid.h>11 12#include "psb_intel_drv.h"13 14/**15 * psb_intel_ddc_probe16 * @adapter: Associated I2C adaptor17 */18bool psb_intel_ddc_probe(struct i2c_adapter *adapter)19{20 u8 out_buf[] = { 0x0, 0x0 };21 u8 buf[2];22 int ret;23 struct i2c_msg msgs[] = {24 {25 .addr = 0x50,26 .flags = 0,27 .len = 1,28 .buf = out_buf,29 },30 {31 .addr = 0x50,32 .flags = I2C_M_RD,33 .len = 1,34 .buf = buf,35 }36 };37 38 ret = i2c_transfer(adapter, msgs, 2);39 if (ret == 2)40 return true;41 42 return false;43}44 45/**46 * psb_intel_ddc_get_modes - get modelist from monitor47 * @connector: DRM connector device to use48 * @adapter: Associated I2C adaptor49 *50 * Fetch the EDID information from @connector using the DDC bus.51 */52int psb_intel_ddc_get_modes(struct drm_connector *connector,53 struct i2c_adapter *adapter)54{55 struct edid *edid;56 int ret = 0;57 58 edid = drm_get_edid(connector, adapter);59 if (edid) {60 drm_connector_update_edid_property(connector, edid);61 ret = drm_add_edid_modes(connector, edid);62 kfree(edid);63 }64 return ret;65}66