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* Copyright 2011 Florian Tobias Schandinat <>
* 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, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* infrastructure for devices connected via I2C
#ifndef __VIA_AUX_H__
#define __VIA_AUX_H__
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/fb.h>
struct via_aux_bus {
struct i2c_adapter *adap; /* the I2C device to access the bus */
struct list_head drivers; /* drivers for devices on this bus */
struct via_aux_drv {
struct list_head chain; /* chain to support multiple drivers */
struct via_aux_bus *bus; /* the I2C bus used */
u8 addr; /* the I2C slave address */
const char *name; /* human readable name of the driver */
void *data; /* private data of this driver */
void (*cleanup)(struct via_aux_drv *drv);
const struct fb_videomode* (*get_preferred_mode)
(struct via_aux_drv *drv);
struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
void via_aux_free(struct via_aux_bus *bus);
const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
static inline bool via_aux_add(struct via_aux_drv *drv)
struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return false;
*data = *drv;
list_add_tail(&data->chain, &data->bus->drivers);
return true;
static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf,
u8 len)
struct i2c_msg msg[2] = {
{.addr = drv->addr, .flags = 0, .len = 1, .buf = &start},
{.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} };
return i2c_transfer(drv->bus->adap, msg, 2) == 2;
/* probe functions of existing drivers - should only be called in via_aux.c */
void via_aux_ch7301_probe(struct via_aux_bus *bus);
void via_aux_edid_probe(struct via_aux_bus *bus);
void via_aux_sii164_probe(struct via_aux_bus *bus);
void via_aux_vt1636_probe(struct via_aux_bus *bus);
void via_aux_vt1632_probe(struct via_aux_bus *bus);
void via_aux_vt1631_probe(struct via_aux_bus *bus);
void via_aux_vt1625_probe(struct via_aux_bus *bus);
void via_aux_vt1622_probe(struct via_aux_bus *bus);
void via_aux_vt1621_probe(struct via_aux_bus *bus);
#endif /* __VIA_AUX_H__ */