a7ab72390b
All i2c-muxes have a parent adapter and one or many child adapters. A mux also has some means of selection. Previously, this was stored per child adapter, but it is only needed to keep track of this per mux. Add an i2c mux core, that keeps track of this consistently. Also add some glue for users of the old interface, which will create one implicit mux core per child adapter. Signed-off-by: Peter Rosin <peda@axentia.se> Tested-by: Antti Palosaari <crope@iki.fi> Tested-by: Crestez Dan Leonard <leonard.crestez@intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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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 <giometti@linux.it>
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* Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
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* Michael Lawnick <michael.lawnick.ext@nsn.com>
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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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struct i2c_mux_core {
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struct i2c_adapter *parent;
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struct device *dev;
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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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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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/*
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* Called to create a i2c bus on a multiplexed bus segment.
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* The mux_dev and chan_id parameters are passed to the select
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* and deselect callback functions to perform hardware-specific
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* mux control.
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*/
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struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
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struct device *mux_dev,
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void *mux_priv, u32 force_nr, u32 chan_id,
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unsigned int class,
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int (*select) (struct i2c_adapter *,
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void *mux_dev, u32 chan_id),
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int (*deselect) (struct i2c_adapter *,
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void *mux_dev, u32 chan_id));
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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_del_mux_adapter(struct i2c_adapter *adap);
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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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