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
|
/*-
* Copyright (c) 2006 Sam Leffler. 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 AUTHOR ``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 AUTHOR 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("$FreeBSD$");
/*
* Dallas Semiconductor DS1672 RTC sitting on the I2C bus.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/clock.h>
#include <sys/time.h>
#include <sys/bus.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/frame.h>
#include <machine/resource.h>
#include <machine/intr.h>
#include <dev/iicbus/iiconf.h>
#include "iicbus_if.h"
#include "clock_if.h"
#define IIC_M_WR 0 /* write operation */
#define DS1672_ADDR 0xd0 /* slave address */
#define DS1672_COUNTER 0 /* counter (bytes 0-3) */
#define DS1672_CTRL 4 /* control (1 byte) */
#define DS1672_TRICKLE 5 /* trickle charger (1 byte) */
#define NANOSEC 1000000000
struct ds1672_softc {
device_t sc_dev;
};
static int
ds1672_probe(device_t dev)
{
/* XXX really probe? */
device_set_desc(dev, "Dallas Semiconductor DS1672 RTC");
return (0);
}
static int
ds1672_attach(device_t dev)
{
struct ds1672_softc *sc = device_get_softc(dev);
sc->sc_dev = dev;
clock_register(dev, 1000);
return (0);
}
static int
ds1672_gettime(device_t dev, struct timespec *ts)
{
uint8_t addr[1] = { DS1672_COUNTER };
uint8_t secs[4];
struct iic_msg msgs[2] = {
{ DS1672_ADDR, IIC_M_WR, 1, addr },
{ DS1672_ADDR, IIC_M_RD, 4, secs },
};
int error;
error = iicbus_transfer(dev, msgs, 2);
if (error == 0) {
/* counter has seconds since epoch */
ts->tv_sec = (secs[3] << 24) | (secs[2] << 16)
| (secs[1] << 8) | (secs[0] << 0);
ts->tv_nsec = NANOSEC / 2;
}
return error;
}
static int
ds1672_settime(device_t dev, struct timespec *ts)
{
/* NB: register pointer precedes actual data */
uint8_t data[5] = { DS1672_COUNTER };
struct iic_msg msgs[1] = {
{ DS1672_ADDR, IIC_M_WR, 5, data },
};
data[1] = (ts->tv_sec >> 0) & 0xff;
data[2] = (ts->tv_sec >> 8) & 0xff;
data[3] = (ts->tv_sec >> 16) & 0xff;
data[4] = (ts->tv_sec >> 24) & 0xff;
return iicbus_transfer(dev, msgs, 1);
}
static device_method_t ds1672_methods[] = {
DEVMETHOD(device_probe, ds1672_probe),
DEVMETHOD(device_attach, ds1672_attach),
DEVMETHOD(clock_gettime, ds1672_gettime),
DEVMETHOD(clock_settime, ds1672_settime),
{0, 0},
};
static driver_t ds1672_driver = {
"ds1672",
ds1672_methods,
sizeof(struct ds1672_softc),
};
static devclass_t ds1672_devclass;
DRIVER_MODULE(ds1672, iicbus, ds1672_driver, ds1672_devclass, 0, 0);
MODULE_VERSION(ds1672, 1);
MODULE_DEPEND(ds1672, iicbus, 1, 1, 1);
|
