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Florian Tobias Schandinate7589272011-07-30 01:25:29 +00001/*
2 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License as published by the Free Software Foundation;
7 * either version 2, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
11 * the implied warranty of MERCHANTABILITY or FITNESS FOR
12 * A PARTICULAR PURPOSE.See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20/*
21 * infrastructure for devices connected via I2C
22 */
23
24#ifndef __VIA_AUX_H__
25#define __VIA_AUX_H__
26
27
28#include <linux/list.h>
29#include <linux/i2c.h>
Florian Tobias Schandinat5dc5f612012-01-12 12:52:37 +000030#include <linux/fb.h>
Florian Tobias Schandinate7589272011-07-30 01:25:29 +000031
32
33struct via_aux_bus {
34 struct i2c_adapter *adap; /* the I2C device to access the bus */
35 struct list_head drivers; /* drivers for devices on this bus */
36};
37
38struct via_aux_drv {
39 struct list_head chain; /* chain to support multiple drivers */
40
41 struct via_aux_bus *bus; /* the I2C bus used */
42 u8 addr; /* the I2C slave address */
43
44 const char *name; /* human readable name of the driver */
45 void *data; /* private data of this driver */
Florian Tobias Schandinat5dc5f612012-01-12 12:52:37 +000046
47 void (*cleanup)(struct via_aux_drv *drv);
48 const struct fb_videomode* (*get_preferred_mode)
49 (struct via_aux_drv *drv);
Florian Tobias Schandinate7589272011-07-30 01:25:29 +000050};
51
52
53struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
54void via_aux_free(struct via_aux_bus *bus);
Florian Tobias Schandinat5dc5f612012-01-12 12:52:37 +000055const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
Florian Tobias Schandinate7589272011-07-30 01:25:29 +000056
57
58static inline bool via_aux_add(struct via_aux_drv *drv)
59{
60 struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL);
61
62 if (!data)
63 return false;
64
65 *data = *drv;
66 list_add_tail(&data->chain, &data->bus->drivers);
67 return true;
68}
69
70static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf,
71 u8 len)
72{
73 struct i2c_msg msg[2] = {
74 {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start},
75 {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} };
76
77 return i2c_transfer(drv->bus->adap, msg, 2) == 2;
78}
79
80
81/* probe functions of existing drivers - should only be called in via_aux.c */
82void via_aux_ch7301_probe(struct via_aux_bus *bus);
83void via_aux_edid_probe(struct via_aux_bus *bus);
84void via_aux_sii164_probe(struct via_aux_bus *bus);
85void via_aux_vt1636_probe(struct via_aux_bus *bus);
86void via_aux_vt1632_probe(struct via_aux_bus *bus);
87void via_aux_vt1631_probe(struct via_aux_bus *bus);
88void via_aux_vt1625_probe(struct via_aux_bus *bus);
89void via_aux_vt1622_probe(struct via_aux_bus *bus);
90void via_aux_vt1621_probe(struct via_aux_bus *bus);
91
92
93#endif /* __VIA_AUX_H__ */