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1 | /* | |
2 | * | |
3 | * i2c-mux.h - functions for the i2c-bus mux support | |
4 | * | |
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> | |
8 | * | |
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. | |
13 | * | |
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. | |
18 | * | |
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, | |
22 | * MA 02110-1301 USA. | |
23 | */ | |
24 | ||
25 | #ifndef _LINUX_I2C_MUX_H | |
26 | #define _LINUX_I2C_MUX_H | |
27 | ||
28 | #ifdef __KERNEL__ | |
29 | ||
30 | struct i2c_mux_core { | |
31 | struct i2c_adapter *parent; | |
32 | struct device *dev; | |
33 | ||
34 | void *priv; | |
35 | ||
36 | int (*select)(struct i2c_mux_core *, u32 chan_id); | |
37 | int (*deselect)(struct i2c_mux_core *, u32 chan_id); | |
38 | ||
39 | int num_adapters; | |
40 | int max_adapters; | |
41 | struct i2c_adapter *adapter[0]; | |
42 | }; | |
43 | ||
44 | struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, | |
45 | struct device *dev, int max_adapters, | |
46 | int sizeof_priv, u32 flags, | |
47 | int (*select)(struct i2c_mux_core *, u32), | |
48 | int (*deselect)(struct i2c_mux_core *, u32)); | |
49 | ||
50 | static inline void *i2c_mux_priv(struct i2c_mux_core *muxc) | |
51 | { | |
52 | return muxc->priv; | |
53 | } | |
54 | ||
55 | /* | |
56 | * Called to create a i2c bus on a multiplexed bus segment. | |
57 | * The mux_dev and chan_id parameters are passed to the select | |
58 | * and deselect callback functions to perform hardware-specific | |
59 | * mux control. | |
60 | */ | |
61 | struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, | |
62 | struct device *mux_dev, | |
63 | void *mux_priv, u32 force_nr, u32 chan_id, | |
64 | unsigned int class, | |
65 | int (*select) (struct i2c_adapter *, | |
66 | void *mux_dev, u32 chan_id), | |
67 | int (*deselect) (struct i2c_adapter *, | |
68 | void *mux_dev, u32 chan_id)); | |
69 | /* | |
70 | * Called to create an i2c bus on a multiplexed bus segment. | |
71 | * The chan_id parameter is passed to the select and deselect | |
72 | * callback functions to perform hardware-specific mux control. | |
73 | */ | |
74 | int i2c_mux_add_adapter(struct i2c_mux_core *muxc, | |
75 | u32 force_nr, u32 chan_id, | |
76 | unsigned int class); | |
77 | ||
78 | void i2c_del_mux_adapter(struct i2c_adapter *adap); | |
79 | void i2c_mux_del_adapters(struct i2c_mux_core *muxc); | |
80 | ||
81 | #endif /* __KERNEL__ */ | |
82 | ||
83 | #endif /* _LINUX_I2C_MUX_H */ |