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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/linux/i2c-mux.h
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
4 * i2c-mux.h - functions for the i2c-bus mux support
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>
11 #ifndef _LINUX_I2C_MUX_H
12 #define _LINUX_I2C_MUX_H
16 #include <linux/bitops.h>
19 struct i2c_adapter
*parent
;
21 unsigned int mux_locked
:1;
22 unsigned int arbitrator
:1;
27 int (*select
)(struct i2c_mux_core
*, u32 chan_id
);
28 int (*deselect
)(struct i2c_mux_core
*, u32 chan_id
);
32 struct i2c_adapter
*adapter
[0];
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
));
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)
46 static inline void *i2c_mux_priv(struct i2c_mux_core
*muxc
)
51 struct i2c_adapter
*i2c_root_adapter(struct device
*dev
);
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.
58 int i2c_mux_add_adapter(struct i2c_mux_core
*muxc
,
59 u32 force_nr
, u32 chan_id
,
62 void i2c_mux_del_adapters(struct i2c_mux_core
*muxc
);
64 #endif /* __KERNEL__ */
66 #endif /* _LINUX_I2C_MUX_H */