66 lines
1.2 KiB
C
66 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2007 Intel Corporation
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*
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* Authers: Jesse Barnes <jesse.barnes@intel.com>
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*/
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#include <linux/i2c.h>
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#include <drm/drm_edid.h>
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#include "psb_intel_drv.h"
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/**
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* psb_intel_ddc_probe
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* @adapter: Associated I2C adaptor
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*/
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bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
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{
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u8 out_buf[] = { 0x0, 0x0 };
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u8 buf[2];
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int ret;
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struct i2c_msg msgs[] = {
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{
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.addr = 0x50,
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.flags = 0,
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.len = 1,
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.buf = out_buf,
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},
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{
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.addr = 0x50,
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.flags = I2C_M_RD,
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.len = 1,
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.buf = buf,
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}
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};
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ret = i2c_transfer(adapter, msgs, 2);
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if (ret == 2)
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return true;
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return false;
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}
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/**
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* psb_intel_ddc_get_modes - get modelist from monitor
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* @connector: DRM connector device to use
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* @adapter: Associated I2C adaptor
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*
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* Fetch the EDID information from @connector using the DDC bus.
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*/
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int psb_intel_ddc_get_modes(struct drm_connector *connector,
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struct i2c_adapter *adapter)
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{
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struct edid *edid;
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int ret = 0;
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edid = drm_get_edid(connector, adapter);
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if (edid) {
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drm_connector_update_edid_property(connector, edid);
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ret = drm_add_edid_modes(connector, edid);
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kfree(edid);
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}
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return ret;
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}
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