[mirror_ubuntu-bionic-kernel.git] / include / linux / i2c-mux.h

/*
 *
 * i2c-mux.h - functions for the i2c-bus mux support
 *
 * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it>
 * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
 * Michael Lawnick <michael.lawnick.ext@nsn.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA.
 */

#ifndef _LINUX_I2C_MUX_H
#define _LINUX_I2C_MUX_H

#ifdef __KERNEL__

struct i2c_mux_core {
	struct i2c_adapter *parent;
	struct device *dev;

	void *priv;

	int (*select)(struct i2c_mux_core *, u32 chan_id);
	int (*deselect)(struct i2c_mux_core *, u32 chan_id);

	int num_adapters;
	int max_adapters;
	struct i2c_adapter *adapter[0];
};

struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent,
				   struct device *dev, int max_adapters,
				   int sizeof_priv, u32 flags,
				   int (*select)(struct i2c_mux_core *, u32),
				   int (*deselect)(struct i2c_mux_core *, u32));

static inline void *i2c_mux_priv(struct i2c_mux_core *muxc)
{
	return muxc->priv;
}

/*
 * Called to create a i2c bus on a multiplexed bus segment.
 * The mux_dev and chan_id parameters are passed to the select
 * and deselect callback functions to perform hardware-specific
 * mux control.
 */
struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
				struct device *mux_dev,
				void *mux_priv, u32 force_nr, u32 chan_id,
				unsigned int class,
				int (*select) (struct i2c_adapter *,
					       void *mux_dev, u32 chan_id),
				int (*deselect) (struct i2c_adapter *,
						 void *mux_dev, u32 chan_id));
/*
 * Called to create an i2c bus on a multiplexed bus segment.
 * The chan_id parameter is passed to the select and deselect
 * callback functions to perform hardware-specific mux control.
 */
int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
			u32 force_nr, u32 chan_id,
			unsigned int class);

void i2c_del_mux_adapter(struct i2c_adapter *adap);
void i2c_mux_del_adapters(struct i2c_mux_core *muxc);

#endif /* __KERNEL__ */

#endif /* _LINUX_I2C_MUX_H */
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,
5694f8a8 JD	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
a7ab7239 PR	30	struct i2c_mux_core {
	31	struct i2c_adapter *parent;
	32	struct device *dev;
	33
	34	void *priv;
	35
	36	int (select)(struct i2c_mux_core , u32 chan_id);
	37	int (deselect)(struct i2c_mux_core , u32 chan_id);
	38
	39	int num_adapters;
	40	int max_adapters;
	41	struct i2c_adapter *adapter[0];
	42	};
	43
	44	struct i2c_mux_core i2c_mux_alloc(struct i2c_adapter parent,
	45	struct device *dev, int max_adapters,
	46	int sizeof_priv, u32 flags,
	47	int (select)(struct i2c_mux_core , u32),
	48	int (deselect)(struct i2c_mux_core , u32));
	49
	50	static inline void i2c_mux_priv(struct i2c_mux_core muxc)
	51	{
	52	return muxc->priv;
	53	}
	54
0826374b ML	55	/*
	56	* Called to create a i2c bus on a multiplexed bus segment.
	57	* The mux_dev and chan_id parameters are passed to the select
	58	* and deselect callback functions to perform hardware-specific
	59	* mux control.
	60	*/
	61	struct i2c_adapter i2c_add_mux_adapter(struct i2c_adapter parent,
5a3ecd5f DD	62	struct device *mux_dev,
5a3ecd5f DD	63	void *mux_priv, u32 force_nr, u32 chan_id,
eee543e8	64	unsigned int class,
0826374b ML	65	int (select) (struct i2c_adapter ,
	66	void *mux_dev, u32 chan_id),
	67	int (deselect) (struct i2c_adapter ,
	68	void *mux_dev, u32 chan_id));
a7ab7239 PR	69	/*
	70	* Called to create an i2c bus on a multiplexed bus segment.
	71	* The chan_id parameter is passed to the select and deselect
	72	* callback functions to perform hardware-specific mux control.
	73	*/
	74	int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
	75	u32 force_nr, u32 chan_id,
	76	unsigned int class);
0826374b	77
51d95709	78	void i2c_del_mux_adapter(struct i2c_adapter *adap);
a7ab7239	79	void i2c_mux_del_adapters(struct i2c_mux_core *muxc);
0826374b ML	80
	81	#endif /* __KERNEL__ */
	82
	83	#endif /* _LINUX_I2C_MUX_H */