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Linux/include/linux/i2c-mux.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  *
  4  * i2c-mux.h - functions for the i2c-bus mux support
  5  *
  6  * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it>
  7  * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
  8  * Michael Lawnick <michael.lawnick.ext@nsn.com>
  9  */
 10 
 11 #ifndef _LINUX_I2C_MUX_H
 12 #define _LINUX_I2C_MUX_H
 13 
 14 #ifdef __KERNEL__
 15 
 16 #include <linux/bitops.h>
 17 
 18 struct i2c_mux_core {
 19         struct i2c_adapter *parent;
 20         struct device *dev;
 21         unsigned int mux_locked:1;
 22         unsigned int arbitrator:1;
 23         unsigned int gate:1;
 24 
 25         void *priv;
 26 
 27         int (*select)(struct i2c_mux_core *, u32 chan_id);
 28         int (*deselect)(struct i2c_mux_core *, u32 chan_id);
 29 
 30         int num_adapters;
 31         int max_adapters;
 32         struct i2c_adapter *adapter[0];
 33 };
 34 
 35 struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent,
 36                                    struct device *dev, int max_adapters,
 37                                    int sizeof_priv, u32 flags,
 38                                    int (*select)(struct i2c_mux_core *, u32),
 39                                    int (*deselect)(struct i2c_mux_core *, u32));
 40 
 41 /* flags for i2c_mux_alloc */
 42 #define I2C_MUX_LOCKED     BIT(0)
 43 #define I2C_MUX_ARBITRATOR BIT(1)
 44 #define I2C_MUX_GATE       BIT(2)
 45 
 46 static inline void *i2c_mux_priv(struct i2c_mux_core *muxc)
 47 {
 48         return muxc->priv;
 49 }
 50 
 51 struct i2c_adapter *i2c_root_adapter(struct device *dev);
 52 
 53 /*
 54  * Called to create an i2c bus on a multiplexed bus segment.
 55  * The chan_id parameter is passed to the select and deselect
 56  * callback functions to perform hardware-specific mux control.
 57  */
 58 int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
 59                         u32 force_nr, u32 chan_id,
 60                         unsigned int class);
 61 
 62 void i2c_mux_del_adapters(struct i2c_mux_core *muxc);
 63 
 64 #endif /* __KERNEL__ */
 65 
 66 #endif /* _LINUX_I2C_MUX_H */
 67 

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