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linux-headers-6.8.0-36
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pmac_low_i2c.h
/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * include/asm-ppc/pmac_low_i2c.h * * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org) */ #ifndef __PMAC_LOW_I2C_H__ #define __PMAC_LOW_I2C_H__ #ifdef __KERNEL__ /* i2c mode (based on the platform functions format) */ enum { pmac_i2c_mode_dumb = 1, pmac_i2c_mode_std = 2, pmac_i2c_mode_stdsub = 3, pmac_i2c_mode_combined = 4, }; /* RW bit in address */ enum { pmac_i2c_read = 0x01, pmac_i2c_write = 0x00 }; /* i2c bus type */ enum { pmac_i2c_bus_keywest = 0, pmac_i2c_bus_pmu = 1, pmac_i2c_bus_smu = 2, }; /* i2c bus features */ enum { /* can_largesub : supports >1 byte subaddresses (SMU only) */ pmac_i2c_can_largesub = 0x00000001u, /* multibus : device node holds multiple busses, bus number is * encoded in bits 0xff00 of "reg" of a given device */ pmac_i2c_multibus = 0x00000002u, }; /* i2c busses in the system */ struct pmac_i2c_bus; struct i2c_adapter; /* Init, called early during boot */ extern int pmac_i2c_init(void); /* Lookup an i2c bus for a device-node. The node can be either the bus * node itself or a device below it. In the case of a multibus, the bus * node itself is the controller node, else, it's a child of the controller * node */ extern struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node); /* Get the address for an i2c device. This strips the bus number if * necessary. The 7 bits address is returned 1 bit right shifted so that the * direction can be directly ored in */ extern u8 pmac_i2c_get_dev_addr(struct device_node *device); /* Get infos about a bus */ extern struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus); extern struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus); extern int pmac_i2c_get_type(struct pmac_i2c_bus *bus); extern int pmac_i2c_get_flags(struct pmac_i2c_bus *bus); extern int pmac_i2c_get_channel(struct pmac_i2c_bus *bus); /* i2c layer adapter helpers */ extern struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus); extern struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter); /* March a device or bus with an i2c adapter structure, to be used by drivers * to match device-tree nodes with i2c adapters during adapter discovery * callbacks */ extern int pmac_i2c_match_adapter(struct device_node *dev, struct i2c_adapter *adapter); /* (legacy) Locking functions exposed to i2c-keywest */ extern int pmac_low_i2c_lock(struct device_node *np); extern int pmac_low_i2c_unlock(struct device_node *np); /* Access functions for platform code */ extern int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled); extern void pmac_i2c_close(struct pmac_i2c_bus *bus); extern int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode); extern int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, u32 subaddr, u8 *data, int len); /* Suspend/resume code called by via-pmu directly for now */ extern void pmac_pfunc_i2c_suspend(void); extern void pmac_pfunc_i2c_resume(void); #endif /* __KERNEL__ */ #endif /* __PMAC_LOW_I2C_H__ */
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