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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
i2c-via.c - Part of lm_sensors, Linux kernel modules
for hardware monitoring
i2c Support for Via Technologies 82C586B South Bridge
Copyright (c) 1998, 1999 Ky�sti M�lkki <kmalkki@cc.hut.fi>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <asm/io.h>
/* Power management registers */
#define PM_CFG_REVID 0x08 /* silicon revision code */
#define PM_CFG_IOBASE0 0x20
#define PM_CFG_IOBASE1 0x48
#define I2C_DIR (pm_io_base+0x40)
#define I2C_OUT (pm_io_base+0x42)
#define I2C_IN (pm_io_base+0x44)
#define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */
#define I2C_SDA 0x04
/* io-region reservation */
#define IOSPACE 0x06
static struct pci_driver vt586b_driver;
static u16 pm_io_base;
/*
It does not appear from the datasheet that the GPIO pins are
open drain. So a we set a low value by setting the direction to
output and a high value by setting the direction to input and
relying on the required I2C pullup. The data value is initialized
to 0 in via_init() and never changed.
*/
static void bit_via_setscl(void *data, int state)
{
outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR);
}
static void bit_via_setsda(void *data, int state)
{
outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR);
}
static int bit_via_getscl(void *data)
{
return (0 != (inb(I2C_IN) & I2C_SCL));
}
static int bit_via_getsda(void *data)
{
return (0 != (inb(I2C_IN) & I2C_SDA));
}
static struct i2c_algo_bit_data bit_data = {
.setsda = bit_via_setsda,
.setscl = bit_via_setscl,
.getsda = bit_via_getsda,
.getscl = bit_via_getscl,
.udelay = 5,
.mdelay = 5,
.timeout = HZ
};
static struct i2c_adapter vt586b_adapter = {
.owner = THIS_MODULE,
.class = I2C_CLASS_HWMON,
.name = "VIA i2c",
.algo_data = &bit_data,
};
static struct pci_device_id vt586b_ids[] __devinitdata = {
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) },
{ 0, }
};
MODULE_DEVICE_TABLE (pci, vt586b_ids);
static int __devinit vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
u16 base;
u8 rev;
int res;
if (pm_io_base) {
dev_err(&dev->dev, "i2c-via: Will only support one host\n");
return -ENODEV;
}
pci_read_config_byte(dev, PM_CFG_REVID, &rev);
switch (rev) {
case 0x00:
base = PM_CFG_IOBASE0;
break;
case 0x01:
case 0x10:
base = PM_CFG_IOBASE1;
break;
default:
base = PM_CFG_IOBASE1;
/* later revision */
}
pci_read_config_word(dev, base, &pm_io_base);
pm_io_base &= (0xff << 8);
if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) {
dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE);
return -ENODEV;
}
outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR);
outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT);
/* set up the driverfs linkage to our parent device */
vt586b_adapter.dev.parent = &dev->dev;
res = i2c_bit_add_bus(&vt586b_adapter);
if ( res < 0 ) {
release_region(I2C_DIR, IOSPACE);
pm_io_base = 0;
return res;
}
return 0;
}
static void __devexit vt586b_remove(struct pci_dev *dev)
{
i2c_bit_del_bus(&vt586b_adapter);
release_region(I2C_DIR, IOSPACE);
pm_io_base = 0;
}
static struct pci_driver vt586b_driver = {
.name = "vt586b_smbus",
.id_table = vt586b_ids,
.probe = vt586b_probe,
.remove = __devexit_p(vt586b_remove),
};
static int __init i2c_vt586b_init(void)
{
return pci_register_driver(&vt586b_driver);
}
static void __exit i2c_vt586b_exit(void)
{
pci_unregister_driver(&vt586b_driver);
}
MODULE_AUTHOR("Ky�sti M�lkki <kmalkki@cc.hut.fi>");
MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge");
MODULE_LICENSE("GPL");
module_init(i2c_vt586b_init);
module_exit(i2c_vt586b_exit);
|
