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Brightness (macOS): detect brightness of external monitors with DDC/CI

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This commit is contained in:
李通洲
2023-07-08 23:56:44 +08:00
parent faf6d139d1
commit 30afe7e86b
1 changed files with 65 additions and 30 deletions
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src/detection/brightness/brightness_apple.c
+65 -30
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@@ -1,50 +1,85 @@
#include "brightness.h"
#include "detection/displayserver/displayserver.h"
#include "util/apple/cf_helpers.h"
#include <CoreGraphics/CoreGraphics.h>
extern int DisplayServicesGetBrightness(CGDirectDisplayID display, float *brightness) __attribute__((weak_import));
extern CFDictionaryRef CoreDisplay_DisplayCreateInfoDictionary(CGDirectDisplayID display) __attribute__((weak_import));
// DDC/CI
typedef CFTypeRef IOAVServiceRef;
extern IOAVServiceRef IOAVServiceCreate(CFAllocatorRef allocator);
extern IOAVServiceRef IOAVServiceCreateWithService(CFAllocatorRef allocator, io_service_t service);
extern IOReturn IOAVServiceCopyEDID(IOAVServiceRef service, CFDataRef* x2);
extern IOReturn IOAVServiceReadI2C(IOAVServiceRef service, uint32_t chipAddress, uint32_t offset, void* outputBuffer, uint32_t outputBufferSize);
extern IOReturn IOAVServiceWriteI2C(IOAVServiceRef service, uint32_t chipAddress, uint32_t dataAddress, void* inputBuffer, uint32_t inputBufferSize);
static void getNameFromEdid(uint8_t edid[128], FFstrbuf* name)
{
// https://github.com/jinksong/read_edid/blob/master/parse-edid/parse-edid.c
for (uint32_t i = 0x36; i < 0x7E; i += 0x12)
{ // read through descriptor blocks...
if (edid[i] == 0x00)
{ // not a timing descriptor
if (edid[i+3] == 0xfc)
{ // Model Name tag
for (uint32_t j = 0; j < 13; j++)
{
if (edid[i + 5 + j] == 0x0a)
return;
ffStrbufAppendC(name, (char) edid[i + 5 + j]);
}
}
}
}
}
const char* ffDetectBrightness(FFlist* result)
{
if(DisplayServicesGetBrightness == NULL)
return "DisplayServices function DisplayServicesGetBrightness is not available";
CGDirectDisplayID screens[128];
uint32_t screenCount;
if(CGGetOnlineDisplayList(sizeof(screens) / sizeof(screens[0]), screens, &screenCount) != kCGErrorSuccess)
return "CGGetOnlineDisplayList() failed";
const FFDisplayServerResult* displayServer = ffConnectDisplayServer();
for(uint32_t i = 0; i < screenCount; i++)
FF_LIST_FOR_EACH(FFDisplayResult, display, displayServer->displays)
{
CGDirectDisplayID screen = screens[i];
float brightness;
if(DisplayServicesGetBrightness(screen, &brightness) != kCGErrorSuccess)
continue;
FFBrightnessResult* display = (FFBrightnessResult*) ffListAdd(result);
display->value = brightness * 100;
ffStrbufInit(&display->name);
if(CoreDisplay_DisplayCreateInfoDictionary)
float value;
if(DisplayServicesGetBrightness((CGDirectDisplayID) display->id, &value) == kCGErrorSuccess)
{
CFDictionaryRef FF_CFTYPE_AUTO_RELEASE displayInfo = CoreDisplay_DisplayCreateInfoDictionary(screen);
if(displayInfo)
{
CFDictionaryRef productNames;
if(!ffCfDictGetDict(displayInfo, CFSTR(kDisplayProductName), &productNames))
{
if(!ffCfDictGetString(productNames, CFSTR("en_US"), &display->name))
continue;
}
}
FFBrightnessResult* brightness = (FFBrightnessResult*) ffListAdd(result);
brightness->value = value * 100;
ffStrbufInitCopy(&brightness->name, &display->name);
continue;
}
}
if(CGDisplayIsBuiltin(screen))
ffStrbufAppendS(&display->name, "built-in");
else
ffStrbufAppendF(&display->name, "external-%u", (unsigned) screen);
if (!instance.config.allowSlowOperations)
return NULL;
// https://github.com/waydabber/m1ddc
// This only works for Apple Silicon and USB-C adapter connection ( but not HTMI )
FF_CFTYPE_AUTO_RELEASE IOAVServiceRef service = IOAVServiceCreate(kCFAllocatorDefault);
uint8_t i2cData[12] = { 0x82, 0x01, 0x00 };
i2cData[3] = 0x6e ^ i2cData[0] ^ i2cData[1] ^ i2cData[2] ^ i2cData[3];
for (uint32_t i = 0; i < 3; ++i)
{
IOAVServiceWriteI2C(service, 0x37, 0x51, i2cData, 4);
usleep(10000);
}
memset(i2cData, 0, sizeof(i2cData));
if (IOAVServiceReadI2C(service, 0x37, 0x51, i2cData, sizeof(i2cData)) == KERN_SUCCESS)
{
uint8_t current = i2cData[9], max = i2cData[7];
FFBrightnessResult* brightness = (FFBrightnessResult*) ffListAdd(result);
brightness->value = (float) current * 100.f / max;
ffStrbufInit(&brightness->name);
uint8_t edid[128] = {};
if (IOAVServiceReadI2C(service, 0x50, 0x00, edid, sizeof(edid)) == KERN_SUCCESS)
getNameFromEdid(edid, &brightness->name);
}
return NULL;