1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun /*
6*4882a593Smuzhiyun * infrastructure for devices connected via I2C
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #ifndef __VIA_AUX_H__
10*4882a593Smuzhiyun #define __VIA_AUX_H__
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/list.h>
14*4882a593Smuzhiyun #include <linux/i2c.h>
15*4882a593Smuzhiyun #include <linux/fb.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun struct via_aux_bus {
19*4882a593Smuzhiyun struct i2c_adapter *adap; /* the I2C device to access the bus */
20*4882a593Smuzhiyun struct list_head drivers; /* drivers for devices on this bus */
21*4882a593Smuzhiyun };
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun struct via_aux_drv {
24*4882a593Smuzhiyun struct list_head chain; /* chain to support multiple drivers */
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun struct via_aux_bus *bus; /* the I2C bus used */
27*4882a593Smuzhiyun u8 addr; /* the I2C slave address */
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun const char *name; /* human readable name of the driver */
30*4882a593Smuzhiyun void *data; /* private data of this driver */
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun void (*cleanup)(struct via_aux_drv *drv);
33*4882a593Smuzhiyun const struct fb_videomode* (*get_preferred_mode)
34*4882a593Smuzhiyun (struct via_aux_drv *drv);
35*4882a593Smuzhiyun };
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap);
39*4882a593Smuzhiyun void via_aux_free(struct via_aux_bus *bus);
40*4882a593Smuzhiyun const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun
via_aux_add(struct via_aux_drv * drv)43*4882a593Smuzhiyun static inline bool via_aux_add(struct via_aux_drv *drv)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun if (!data)
48*4882a593Smuzhiyun return false;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun *data = *drv;
51*4882a593Smuzhiyun list_add_tail(&data->chain, &data->bus->drivers);
52*4882a593Smuzhiyun return true;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
via_aux_read(struct via_aux_drv * drv,u8 start,u8 * buf,u8 len)55*4882a593Smuzhiyun static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf,
56*4882a593Smuzhiyun u8 len)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun struct i2c_msg msg[2] = {
59*4882a593Smuzhiyun {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start},
60*4882a593Smuzhiyun {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} };
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun return i2c_transfer(drv->bus->adap, msg, 2) == 2;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun /* probe functions of existing drivers - should only be called in via_aux.c */
67*4882a593Smuzhiyun void via_aux_ch7301_probe(struct via_aux_bus *bus);
68*4882a593Smuzhiyun void via_aux_edid_probe(struct via_aux_bus *bus);
69*4882a593Smuzhiyun void via_aux_sii164_probe(struct via_aux_bus *bus);
70*4882a593Smuzhiyun void via_aux_vt1636_probe(struct via_aux_bus *bus);
71*4882a593Smuzhiyun void via_aux_vt1632_probe(struct via_aux_bus *bus);
72*4882a593Smuzhiyun void via_aux_vt1631_probe(struct via_aux_bus *bus);
73*4882a593Smuzhiyun void via_aux_vt1625_probe(struct via_aux_bus *bus);
74*4882a593Smuzhiyun void via_aux_vt1622_probe(struct via_aux_bus *bus);
75*4882a593Smuzhiyun void via_aux_vt1621_probe(struct via_aux_bus *bus);
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun #endif /* __VIA_AUX_H__ */
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