]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/i2c-mux.h
3 * i2c-mux.h - functions for the i2c-bus mux support
5 * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it>
6 * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
7 * Michael Lawnick <michael.lawnick.ext@nsn.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
25 #ifndef _LINUX_I2C_MUX_H
26 #define _LINUX_I2C_MUX_H
30 #include <linux/bitops.h>
33 struct i2c_adapter
*parent
;
35 unsigned int mux_locked
:1;
36 unsigned int arbitrator
:1;
41 int (*select
)(struct i2c_mux_core
*, u32 chan_id
);
42 int (*deselect
)(struct i2c_mux_core
*, u32 chan_id
);
46 struct i2c_adapter
*adapter
[0];
49 struct i2c_mux_core
*i2c_mux_alloc(struct i2c_adapter
*parent
,
50 struct device
*dev
, int max_adapters
,
51 int sizeof_priv
, u32 flags
,
52 int (*select
)(struct i2c_mux_core
*, u32
),
53 int (*deselect
)(struct i2c_mux_core
*, u32
));
55 /* flags for i2c_mux_alloc */
56 #define I2C_MUX_LOCKED BIT(0)
57 #define I2C_MUX_ARBITRATOR BIT(1)
58 #define I2C_MUX_GATE BIT(2)
60 static inline void *i2c_mux_priv(struct i2c_mux_core
*muxc
)
65 struct i2c_adapter
*i2c_root_adapter(struct device
*dev
);
68 * Called to create an i2c bus on a multiplexed bus segment.
69 * The chan_id parameter is passed to the select and deselect
70 * callback functions to perform hardware-specific mux control.
72 int i2c_mux_add_adapter(struct i2c_mux_core
*muxc
,
73 u32 force_nr
, u32 chan_id
,
76 void i2c_mux_del_adapters(struct i2c_mux_core
*muxc
);
78 #endif /* __KERNEL__ */
80 #endif /* _LINUX_I2C_MUX_H */