1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
4 */
5/*
6 * infrastructure for devices connected via I2C
7 */
8
9#ifndef __VIA_AUX_H__
10#define __VIA_AUX_H__
11
12
13#include <linux/list.h>
14#include <linux/i2c.h>
15#include <linux/fb.h>
16
17
18struct via_aux_bus {
19 struct i2c_adapter *adap; /* the I2C device to access the bus */
20 struct list_head drivers; /* drivers for devices on this bus */
21};
22
23struct via_aux_drv {
24 struct list_head chain; /* chain to support multiple drivers */
25
26 struct via_aux_bus *bus; /* the I2C bus used */
27 u8 addr; /* the I2C slave address */
28
29 const char *name; /* human readable name of the driver */
30 void *data; /* private data of this driver */
31
32 void (*cleanup)(struct via_aux_drv *drv);
33 const struct fb_videomode* (*get_preferred_mode)
34 (struct via_aux_drv *drv);
35};
36
37
38struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
39void via_aux_free(struct via_aux_bus *bus);
40const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
41
42
43static inline bool via_aux_add(struct via_aux_drv *drv)
44{
45 struct via_aux_drv *data = kmalloc(size: sizeof(*data), GFP_KERNEL);
46
47 if (!data)
48 return false;
49
50 *data = *drv;
51 list_add_tail(new: &data->chain, head: &data->bus->drivers);
52 return true;
53}
54
55static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf,
56 u8 len)
57{
58 struct i2c_msg msg[2] = {
59 {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start},
60 {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} };
61
62 return i2c_transfer(adap: drv->bus->adap, msgs: msg, num: 2) == 2;
63}
64
65
66/* probe functions of existing drivers - should only be called in via_aux.c */
67void via_aux_ch7301_probe(struct via_aux_bus *bus);
68void via_aux_edid_probe(struct via_aux_bus *bus);
69void via_aux_sii164_probe(struct via_aux_bus *bus);
70void via_aux_vt1636_probe(struct via_aux_bus *bus);
71void via_aux_vt1632_probe(struct via_aux_bus *bus);
72void via_aux_vt1631_probe(struct via_aux_bus *bus);
73void via_aux_vt1625_probe(struct via_aux_bus *bus);
74void via_aux_vt1622_probe(struct via_aux_bus *bus);
75void via_aux_vt1621_probe(struct via_aux_bus *bus);
76
77
78#endif /* __VIA_AUX_H__ */
79

source code of linux/drivers/video/fbdev/via/via_aux.h