projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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; | |
| 6ef91fcc | 35 | bool mux_locked; |
| a7ab7239 PR |
36 | |
| 37 | void *priv; | |
| 38 | ||
| 39 | int (*select)(struct i2c_mux_core *, u32 chan_id); | |
| 40 | int (*deselect)(struct i2c_mux_core *, u32 chan_id); | |
| 41 | ||
| 42 | int num_adapters; | |
| 43 | int max_adapters; | |
| 44 | struct i2c_adapter *adapter[0]; | |
| 45 | }; | |
| 46 | ||
| 47 | struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, | |
| 48 | struct device *dev, int max_adapters, | |
| 49 | int sizeof_priv, u32 flags, | |
| 50 | int (*select)(struct i2c_mux_core *, u32), | |
| 51 | int (*deselect)(struct i2c_mux_core *, u32)); | |
| 52 | ||
| 6ef91fcc PR |
53 | /* flags for i2c_mux_alloc */ |
| 54 | #define I2C_MUX_LOCKED BIT(0) | |
| 55 | ||
| a7ab7239 PR |
56 | static inline void *i2c_mux_priv(struct i2c_mux_core *muxc) |
| 57 | { | |
| 58 | return muxc->priv; | |
| 59 | } | |
| 60 | ||
| 6ef91fcc PR |
61 | struct i2c_adapter *i2c_root_adapter(struct device *dev); |
| 62 | ||
| a7ab7239 PR |
63 | /* |
| 64 | * Called to create an i2c bus on a multiplexed bus segment. | |
| 65 | * The chan_id parameter is passed to the select and deselect | |
| 66 | * callback functions to perform hardware-specific mux control. | |
| 67 | */ | |
| 68 | int i2c_mux_add_adapter(struct i2c_mux_core *muxc, | |
| 69 | u32 force_nr, u32 chan_id, | |
| 70 | unsigned int class); | |
| 0826374b | 71 | |
| a7ab7239 | 72 | void i2c_mux_del_adapters(struct i2c_mux_core *muxc); |
| 0826374b ML |
73 | |
| 74 | #endif /* __KERNEL__ */ | |
| 75 | ||
| 76 | #endif /* _LINUX_I2C_MUX_H */ |