// SPDX-License-Identifier: GPL-2.0 /* * Nvidia GPU I2C controller Driver * * Copyright (C) 2018 NVIDIA Corporation. All rights reserved. * Author: Ajay Gupta <[email protected]> */ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/platform_device.h> #include <linux/pm.h> #include <linux/pm_runtime.h> #include <linux/power_supply.h> #include <asm/unaligned.h> #include "i2c-ccgx-ucsi.h" /* I2C definitions */ #define I2C_MST_CNTL … #define I2C_MST_CNTL_GEN_START … #define I2C_MST_CNTL_GEN_STOP … #define I2C_MST_CNTL_CMD_READ … #define I2C_MST_CNTL_CMD_WRITE … #define I2C_MST_CNTL_BURST_SIZE_SHIFT … #define I2C_MST_CNTL_GEN_NACK … #define I2C_MST_CNTL_STATUS … #define I2C_MST_CNTL_STATUS_OKAY … #define I2C_MST_CNTL_STATUS_NO_ACK … #define I2C_MST_CNTL_STATUS_TIMEOUT … #define I2C_MST_CNTL_STATUS_BUS_BUSY … #define I2C_MST_CNTL_CYCLE_TRIGGER … #define I2C_MST_ADDR … #define I2C_MST_I2C0_TIMING … #define I2C_MST_I2C0_TIMING_SCL_PERIOD_100KHZ … #define I2C_MST_I2C0_TIMING_TIMEOUT_CLK_CNT … #define I2C_MST_I2C0_TIMING_TIMEOUT_CLK_CNT_MAX … #define I2C_MST_I2C0_TIMING_TIMEOUT_CHECK … #define I2C_MST_DATA … #define I2C_MST_HYBRID_PADCTL … #define I2C_MST_HYBRID_PADCTL_MODE_I2C … #define I2C_MST_HYBRID_PADCTL_I2C_SCL_INPUT_RCV … #define I2C_MST_HYBRID_PADCTL_I2C_SDA_INPUT_RCV … struct gpu_i2c_dev { … }; static void gpu_enable_i2c_bus(struct gpu_i2c_dev *i2cd) { … } static int gpu_i2c_check_status(struct gpu_i2c_dev *i2cd) { … } static int gpu_i2c_read(struct gpu_i2c_dev *i2cd, u8 *data, u16 len) { … } static int gpu_i2c_start(struct gpu_i2c_dev *i2cd) { … } static int gpu_i2c_stop(struct gpu_i2c_dev *i2cd) { … } static int gpu_i2c_write(struct gpu_i2c_dev *i2cd, u8 data) { … } static int gpu_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { … } static const struct i2c_adapter_quirks gpu_i2c_quirks = …; static u32 gpu_i2c_functionality(struct i2c_adapter *adap) { … } static const struct i2c_algorithm gpu_i2c_algorithm = …; /* * This driver is for Nvidia GPU cards with USB Type-C interface. * We want to identify the cards using vendor ID and class code only * to avoid dependency of adding product id for any new card which * requires this driver. * Currently there is no class code defined for UCSI device over PCI * so using UNKNOWN class for now and it will be updated when UCSI * over PCI gets a class code. * There is no other NVIDIA cards with UNKNOWN class code. Even if the * driver gets loaded for an undesired card then eventually i2c_read() * (initiated from UCSI i2c_client) will timeout or UCSI commands will * timeout. */ #define PCI_CLASS_SERIAL_UNKNOWN … static const struct pci_device_id gpu_i2c_ids[] = …; MODULE_DEVICE_TABLE(pci, gpu_i2c_ids); static const struct property_entry ccgx_props[] = …; static const struct software_node ccgx_node = …; static int gpu_i2c_probe(struct pci_dev *pdev, const struct pci_device_id *id) { … } static void gpu_i2c_remove(struct pci_dev *pdev) { … } #define gpu_i2c_suspend … static __maybe_unused int gpu_i2c_resume(struct device *dev) { … } static UNIVERSAL_DEV_PM_OPS(gpu_i2c_driver_pm, gpu_i2c_suspend, gpu_i2c_resume, NULL); static struct pci_driver gpu_i2c_driver = …; module_pci_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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