forked from mirrors/linux
eee543e824
Let I2C bus segments behind multiplexers have a class. This allows for device auto-detection on these segments. As long as parent segments don't share the same class, it should be fine. I implemented support in drivers i2c-mux-gpio and i2c-mux-pca954x. I left i2c-mux-pca9541 and i2c-mux-pinctrl alone for the moment as I don't know if this feature makes sense for the use cases of these drivers. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Peter Korsgaard <peter.korsgaard@barco.com> Cc: David Daney <david.daney@cavium.com> Cc: Michael Lawnick <ml.lawnick@gmx.de> Cc: Rodolfo Giometti <giometti@linux.it>
49 lines
1.6 KiB
C
49 lines
1.6 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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/*
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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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int i2c_del_mux_adapter(struct i2c_adapter *adap);
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#endif /* __KERNEL__ */
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#endif /* _LINUX_I2C_MUX_H */
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