| /* | |
| * include/asm-ppc/pmac_low_i2c.h | |
| * | |
| * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org) | |
| * | |
| * This program is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU General Public License | |
| * as published by the Free Software Foundation; either version | |
| * 2 of the License, or (at your option) any later version. | |
| * | |
| */ | |
| #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__ */ |