https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 9f4ad9e425a1d3b6a34617b8ea226d56a119a717 authored by Linus Torvalds on 25 April 2021, 20:49:08 UTC
Linux 5.12
Linux 5.12
Tip revision: 9f4ad9e
i2c-mux.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
*
* i2c-mux.h - functions for the i2c-bus mux support
*
* Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it>
* Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
* Michael Lawnick <michael.lawnick.ext@nsn.com>
*/
#ifndef _LINUX_I2C_MUX_H
#define _LINUX_I2C_MUX_H
#ifdef __KERNEL__
#include <linux/bitops.h>
struct i2c_mux_core {
struct i2c_adapter *parent;
struct device *dev;
unsigned int mux_locked:1;
unsigned int arbitrator:1;
unsigned int gate:1;
void *priv;
int (*select)(struct i2c_mux_core *, u32 chan_id);
int (*deselect)(struct i2c_mux_core *, u32 chan_id);
int num_adapters;
int max_adapters;
struct i2c_adapter *adapter[];
};
struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent,
struct device *dev, int max_adapters,
int sizeof_priv, u32 flags,
int (*select)(struct i2c_mux_core *, u32),
int (*deselect)(struct i2c_mux_core *, u32));
/* flags for i2c_mux_alloc */
#define I2C_MUX_LOCKED BIT(0)
#define I2C_MUX_ARBITRATOR BIT(1)
#define I2C_MUX_GATE BIT(2)
static inline void *i2c_mux_priv(struct i2c_mux_core *muxc)
{
return muxc->priv;
}
struct i2c_adapter *i2c_root_adapter(struct device *dev);
/*
* Called to create an i2c bus on a multiplexed bus segment.
* The chan_id parameter is passed to the select and deselect
* callback functions to perform hardware-specific mux control.
*/
int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
u32 force_nr, u32 chan_id,
unsigned int class);
void i2c_mux_del_adapters(struct i2c_mux_core *muxc);
#endif /* __KERNEL__ */
#endif /* _LINUX_I2C_MUX_H */