94 строки
2.8 KiB
C
94 строки
2.8 KiB
C
/*
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* Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation;
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* either version 2, or (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 WARRANTIES OR REPRESENTATIONS; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE.See the GNU General Public License
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* 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.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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* infrastructure for devices connected via I2C
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*/
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#ifndef __VIA_AUX_H__
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#define __VIA_AUX_H__
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#include <linux/list.h>
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#include <linux/i2c.h>
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#include <linux/fb.h>
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struct via_aux_bus {
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struct i2c_adapter *adap; /* the I2C device to access the bus */
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struct list_head drivers; /* drivers for devices on this bus */
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};
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struct via_aux_drv {
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struct list_head chain; /* chain to support multiple drivers */
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struct via_aux_bus *bus; /* the I2C bus used */
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u8 addr; /* the I2C slave address */
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const char *name; /* human readable name of the driver */
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void *data; /* private data of this driver */
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void (*cleanup)(struct via_aux_drv *drv);
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const struct fb_videomode* (*get_preferred_mode)
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(struct via_aux_drv *drv);
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};
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struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
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void via_aux_free(struct via_aux_bus *bus);
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const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
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static inline bool via_aux_add(struct via_aux_drv *drv)
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{
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struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return false;
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*data = *drv;
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list_add_tail(&data->chain, &data->bus->drivers);
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return true;
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}
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static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf,
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u8 len)
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{
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struct i2c_msg msg[2] = {
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{.addr = drv->addr, .flags = 0, .len = 1, .buf = &start},
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{.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} };
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return i2c_transfer(drv->bus->adap, msg, 2) == 2;
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}
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/* probe functions of existing drivers - should only be called in via_aux.c */
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void via_aux_ch7301_probe(struct via_aux_bus *bus);
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void via_aux_edid_probe(struct via_aux_bus *bus);
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void via_aux_sii164_probe(struct via_aux_bus *bus);
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void via_aux_vt1636_probe(struct via_aux_bus *bus);
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void via_aux_vt1632_probe(struct via_aux_bus *bus);
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void via_aux_vt1631_probe(struct via_aux_bus *bus);
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void via_aux_vt1625_probe(struct via_aux_bus *bus);
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void via_aux_vt1622_probe(struct via_aux_bus *bus);
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void via_aux_vt1621_probe(struct via_aux_bus *bus);
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#endif /* __VIA_AUX_H__ */
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