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- /* SPDX-License-Identifier: GPL-2.0-or-later */
- /*
- *
- * i2c-mux.h - functions for the i2c-bus mux support
- *
- * Copyright (c) 2008-2009 Rodolfo Giometti <[email protected]>
- * Copyright (c) 2008-2009 Eurotech S.p.A. <[email protected]>
- * Michael Lawnick <[email protected]>
- */
- #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 */
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