1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/*-
* Copyright (c) 2016 The FreeBSD Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/errno.h>
#include <sys/bus.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h>
/*
* Driver that attaches I2C devices.
*/
static struct {
uint32_t pci_id;
const char *name;
uint8_t addr;
} slaves[] = {
{ 0x9c628086, "isl", 0x88 },
{ 0x9c618086, "cyapa", 0xce },
};
static void
chromebook_i2c_identify(driver_t *driver, device_t bus)
{
device_t controller;
device_t child;
int i;
/*
* A stopgap approach to preserve the status quo.
* A more intelligent approach is required to correctly
* identify a machine model and hardware available on it.
* For instance, DMI could be used.
* See http://lxr.free-electrons.com/source/drivers/platform/chrome/chromeos_laptop.c
*/
controller = device_get_parent(bus);
if (strcmp(device_get_name(controller), "ig4iic") != 0)
return;
for (i = 0; i < nitems(slaves); i++) {
if (device_find_child(bus, slaves[i].name, -1) != NULL)
continue;
if (slaves[i].pci_id != pci_get_devid(controller))
continue;
child = BUS_ADD_CHILD(bus, 0, slaves[i].name, -1);
if (child != NULL)
iicbus_set_addr(child, slaves[i].addr);
}
}
static device_method_t chromebook_i2c_methods[] = {
DEVMETHOD(device_identify, chromebook_i2c_identify),
{ 0, 0 }
};
static driver_t chromebook_i2c_driver = {
"chromebook_i2c",
chromebook_i2c_methods,
0 /* no softc */
};
DRIVER_MODULE(chromebook_i2c, iicbus, chromebook_i2c_driver, 0, 0);
MODULE_VERSION(chromebook_i2c, 1);
|
