1 /*
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>
30 #include <linux/fb.h>
31
32
33 struct 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
38 struct 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 */
46
47 void (*cleanup)(struct via_aux_drv *drv);
48 const struct fb_videomode* (*get_preferred_mode)
49 (struct via_aux_drv *drv);
50 };
51
52
53 struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
54 void via_aux_free(struct via_aux_bus *bus);
55 const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
56
57
via_aux_add(struct via_aux_drv * drv)58 static 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
via_aux_read(struct via_aux_drv * drv,u8 start,u8 * buf,u8 len)70 static 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 */
82 void via_aux_ch7301_probe(struct via_aux_bus *bus);
83 void via_aux_edid_probe(struct via_aux_bus *bus);
84 void via_aux_sii164_probe(struct via_aux_bus *bus);
85 void via_aux_vt1636_probe(struct via_aux_bus *bus);
86 void via_aux_vt1632_probe(struct via_aux_bus *bus);
87 void via_aux_vt1631_probe(struct via_aux_bus *bus);
88 void via_aux_vt1625_probe(struct via_aux_bus *bus);
89 void via_aux_vt1622_probe(struct via_aux_bus *bus);
90 void via_aux_vt1621_probe(struct via_aux_bus *bus);
91
92
93 #endif /* __VIA_AUX_H__ */
94