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80 lines
2.3 KiB
80 lines
2.3 KiB
/* |
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* |
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* i2c-mux.h - functions for the i2c-bus mux support |
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* |
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* Copyright (c) 2008-2009 Rodolfo Giometti <[email protected]> |
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* Copyright (c) 2008-2009 Eurotech S.p.A. <[email protected]> |
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* Michael Lawnick <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
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* MA 02110-1301 USA. |
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*/ |
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#ifndef _LINUX_I2C_MUX_H |
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#define _LINUX_I2C_MUX_H |
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#ifdef __KERNEL__ |
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#include <linux/bitops.h> |
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struct i2c_mux_core { |
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struct i2c_adapter *parent; |
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struct device *dev; |
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unsigned int mux_locked:1; |
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unsigned int arbitrator:1; |
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unsigned int gate:1; |
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void *priv; |
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int (*select)(struct i2c_mux_core *, u32 chan_id); |
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int (*deselect)(struct i2c_mux_core *, u32 chan_id); |
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int num_adapters; |
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int max_adapters; |
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struct i2c_adapter *adapter[0]; |
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}; |
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struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, |
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struct device *dev, int max_adapters, |
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int sizeof_priv, u32 flags, |
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int (*select)(struct i2c_mux_core *, u32), |
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int (*deselect)(struct i2c_mux_core *, u32)); |
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/* flags for i2c_mux_alloc */ |
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#define I2C_MUX_LOCKED BIT(0) |
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#define I2C_MUX_ARBITRATOR BIT(1) |
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#define I2C_MUX_GATE BIT(2) |
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static inline void *i2c_mux_priv(struct i2c_mux_core *muxc) |
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{ |
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return muxc->priv; |
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} |
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struct i2c_adapter *i2c_root_adapter(struct device *dev); |
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/* |
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* Called to create an i2c bus on a multiplexed bus segment. |
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* The chan_id parameter is passed to the select and deselect |
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* callback functions to perform hardware-specific mux control. |
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*/ |
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int i2c_mux_add_adapter(struct i2c_mux_core *muxc, |
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u32 force_nr, u32 chan_id, |
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unsigned int class); |
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void i2c_mux_del_adapters(struct i2c_mux_core *muxc); |
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#endif /* __KERNEL__ */ |
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#endif /* _LINUX_I2C_MUX_H */
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