136 lines
3.8 KiB
C++
136 lines
3.8 KiB
C++
/*-----------------------------------------*\
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| i2c_smbus_nvapi.cpp |
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| NVidia NvAPI I2C driver for Windows |
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| Adam Honse (CalcProgrammer1) 2/21/2020 |
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\*-----------------------------------------*/
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#include "i2c_smbus_nvapi.h"
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i2c_smbus_nvapi::i2c_smbus_nvapi(NV_PHYSICAL_GPU_HANDLE handle)
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{
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this->handle = handle;
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}
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s32 i2c_smbus_nvapi::i2c_smbus_xfer(u8 addr, char read_write, u8 command, int size, i2c_smbus_data* data)
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{
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NV_STATUS ret;
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unsigned int unknown = 0;
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NV_I2C_INFO_V3 i2c_data;
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uint8_t data_buf[8];
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uint8_t chip_addr;
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// Set up chip register address to command, one byte in length
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chip_addr = command;
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i2c_data.i2c_reg_address = &chip_addr;
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i2c_data.reg_addr_size = 1;
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// Set up data buffer, zero bytes in length
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i2c_data.data = data_buf;
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i2c_data.size = 0;
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// Always use GPU port 1 - this is where RGB controllers are attached
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i2c_data.is_ddc_port = 0;
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i2c_data.port_id = 1;
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i2c_data.is_port_id_set = 1;
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// Use default speed
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i2c_data.i2c_speed = 0xFFFF;
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i2c_data.i2c_speed_khz = NV_I2C_SPEED::NVAPI_I2C_SPEED_DEFAULT;
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// Load device address
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i2c_data.i2c_dev_address = (addr << 1);
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switch (size)
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{
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case I2C_SMBUS_BYTE:
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// One byte of data with no register address
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i2c_data.reg_addr_size = 0;
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data_buf[0] = command;
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i2c_data.size = 1;
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break;
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case I2C_SMBUS_BYTE_DATA:
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// One byte of data with one byte of register address
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data_buf[0] = data->byte;
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i2c_data.size = 1;
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break;
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case I2C_SMBUS_WORD_DATA:
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// One word of data with one byte of register address
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data_buf[0] = (data->word & 0x00ff);
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data_buf[1] = (data->word & 0xff00) >> 8;
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i2c_data.size = 2;
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break;
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// Not supported
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case I2C_SMBUS_QUICK:
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case I2C_SMBUS_BLOCK_DATA:
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return -1;
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break;
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default:
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return -1;
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}
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// Perform read or write
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if(read_write == I2C_SMBUS_WRITE)
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{
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ret = NvAPI_I2CWriteEx(handle, &i2c_data, &unknown);
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}
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else
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{
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ret = NvAPI_I2CReadEx(handle, &i2c_data, &unknown);
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if(i2c_data.size == 1)
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{
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data->byte = i2c_data.data[0];
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}
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else
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{
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data->word = (i2c_data.data[0] | (i2c_data.data[1] << 8));
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}
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}
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return(ret);
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}
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#include "Detector.h"
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void i2c_smbus_nvapi_detect()
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{
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static NV_PHYSICAL_GPU_HANDLE gpu_handles[64];
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static NV_S32 gpu_count = 0;
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NV_U32 device_id;
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NV_U32 ext_device_id;
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NV_STATUS res;
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NV_U32 revision_id;
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NV_U32 sub_system_id;
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NV_STATUS initialize = NvAPI_Initialize();
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NvAPI_EnumPhysicalGPUs(gpu_handles, &gpu_count);
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for(NV_S32 gpu_idx = 0; gpu_idx < gpu_count; gpu_idx++)
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{
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i2c_smbus_nvapi * nvapi_bus = new i2c_smbus_nvapi(gpu_handles[gpu_idx]);
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sprintf(nvapi_bus->device_name, "NVidia NvAPI I2C on GPU %d", gpu_idx);
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res = NvAPI_GPU_GetPCIIdentifiers(gpu_handles[gpu_idx], &device_id, &sub_system_id, &revision_id, &ext_device_id);
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if (res == 0)
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{
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nvapi_bus->pci_device = device_id >> 16;
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nvapi_bus->pci_vendor = device_id & 0xffff;
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nvapi_bus->pci_subsystem_device = sub_system_id >> 16;
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nvapi_bus->pci_subsystem_vendor = sub_system_id & 0xffff;
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nvapi_bus->port_id = 1;
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}
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ResourceManager::get()->RegisterI2CBus(nvapi_bus);
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}
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} /* DetectNvAPII2CBusses() */
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REGISTER_I2C_BUS_DETECTOR(i2c_smbus_nvapi_detect);
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