// SPDX-License-Identifier: GPL-2.0-only /* i2c-isch.c - Linux kernel driver for Intel SCH chipset SMBus - Based on i2c-piix4.c Copyright (c) 1998 - 2002 Frodo Looijaard <[email protected]> and Philip Edelbrock <[email protected]> - Intel SCH support Copyright (c) 2007 - 2008 Jacob Jun Pan <[email protected]> */ /* Supports: Intel SCH chipsets (AF82US15W, AF82US15L, AF82UL11L) Note: we assume there can only be one device, with one SMBus interface. */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/stddef.h> #include <linux/ioport.h> #include <linux/i2c.h> #include <linux/io.h> /* SCH SMBus address offsets */ #define SMBHSTCNT … #define SMBHSTSTS … #define SMBHSTCLK … #define SMBHSTADD … #define SMBHSTCMD … #define SMBHSTDAT0 … #define SMBHSTDAT1 … #define SMBBLKDAT … /* Other settings */ #define MAX_RETRIES … /* I2C constants */ #define SCH_QUICK … #define SCH_BYTE … #define SCH_BYTE_DATA … #define SCH_WORD_DATA … #define SCH_BLOCK_DATA … static unsigned short sch_smba; static struct i2c_adapter sch_adapter; static int backbone_speed = …; /* backbone speed in kHz */ module_param(backbone_speed, int, S_IRUSR | S_IWUSR); MODULE_PARM_DESC(…) …; /* * Start the i2c transaction -- the i2c_access will prepare the transaction * and this function will execute it. * return 0 for success and others for failure. */ static int sch_transaction(void) { … } /* * This is the main access entry for i2c-sch access * adap is i2c_adapter pointer, addr is the i2c device bus address, read_write * (0 for read and 1 for write), size is i2c transaction type and data is the * union of transaction for data to be transferred or data read from bus. * return 0 for success and others for failure. */ static s32 sch_access(struct i2c_adapter *adap, u16 addr, unsigned short flags, char read_write, u8 command, int size, union i2c_smbus_data *data) { … } static u32 sch_func(struct i2c_adapter *adapter) { … } static const struct i2c_algorithm smbus_algorithm = …; static struct i2c_adapter sch_adapter = …; static int smbus_sch_probe(struct platform_device *dev) { … } static void smbus_sch_remove(struct platform_device *pdev) { … } static struct platform_driver smbus_sch_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
Codebase Browser
linux