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0826374b ML |
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 | |
5694f8a8 JD |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
22 | * MA 02110-1301 USA. | |
0826374b ML |
23 | */ |
24 | ||
25 | #ifndef _LINUX_I2C_MUX_H | |
26 | #define _LINUX_I2C_MUX_H | |
27 | ||
28 | #ifdef __KERNEL__ | |
29 | ||
6ef91fcc PR |
30 | #include <linux/bitops.h> |
31 | ||
a7ab7239 PR |
32 | struct i2c_mux_core { |
33 | struct i2c_adapter *parent; | |
34 | struct device *dev; | |
b2d57b56 PR |
35 | unsigned int mux_locked:1; |
36 | unsigned int arbitrator:1; | |
37 | unsigned int gate:1; | |
a7ab7239 PR |
38 | |
39 | void *priv; | |
40 | ||
41 | int (*select)(struct i2c_mux_core *, u32 chan_id); | |
42 | int (*deselect)(struct i2c_mux_core *, u32 chan_id); | |
43 | ||
44 | int num_adapters; | |
45 | int max_adapters; | |
46 | struct i2c_adapter *adapter[0]; | |
47 | }; | |
48 | ||
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)); | |
54 | ||
6ef91fcc | 55 | /* flags for i2c_mux_alloc */ |
b2d57b56 PR |
56 | #define I2C_MUX_LOCKED BIT(0) |
57 | #define I2C_MUX_ARBITRATOR BIT(1) | |
58 | #define I2C_MUX_GATE BIT(2) | |
6ef91fcc | 59 | |
a7ab7239 PR |
60 | static inline void *i2c_mux_priv(struct i2c_mux_core *muxc) |
61 | { | |
62 | return muxc->priv; | |
63 | } | |
64 | ||
6ef91fcc PR |
65 | struct i2c_adapter *i2c_root_adapter(struct device *dev); |
66 | ||
a7ab7239 PR |
67 | /* |
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. | |
71 | */ | |
72 | int i2c_mux_add_adapter(struct i2c_mux_core *muxc, | |
73 | u32 force_nr, u32 chan_id, | |
74 | unsigned int class); | |
0826374b | 75 | |
a7ab7239 | 76 | void i2c_mux_del_adapters(struct i2c_mux_core *muxc); |
0826374b ML |
77 | |
78 | #endif /* __KERNEL__ */ | |
79 | ||
80 | #endif /* _LINUX_I2C_MUX_H */ |