81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
|
|
*
|
|
* 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__
|
|
|
|
#include <linux/bitops.h>
|
|
|
|
struct i2c_mux_core {
|
|
struct i2c_adapter *parent;
|
|
struct device *dev;
|
|
unsigned int mux_locked:1;
|
|
unsigned int arbitrator:1;
|
|
unsigned int gate:1;
|
|
|
|
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));
|
|
|
|
/* flags for i2c_mux_alloc */
|
|
#define I2C_MUX_LOCKED BIT(0)
|
|
#define I2C_MUX_ARBITRATOR BIT(1)
|
|
#define I2C_MUX_GATE BIT(2)
|
|
|
|
static inline void *i2c_mux_priv(struct i2c_mux_core *muxc)
|
|
{
|
|
return muxc->priv;
|
|
}
|
|
|
|
struct i2c_adapter *i2c_root_adapter(struct device *dev);
|
|
|
|
/*
|
|
* 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_mux_del_adapters(struct i2c_mux_core *muxc);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _LINUX_I2C_MUX_H */
|