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
|
/* $OpenBSD: gpiosim.c,v 1.1 2008/11/23 18:46:49 mbalmer Exp $ */
/*
* Copyright (c) 2007 Marc Balmer <mbalmer@openbsd.org>
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* 32 bit wide GPIO simulator */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <sys/ioccom.h>
#include <dev/gpio/gpiovar.h>
#include <dev/biovar.h>
#define GPIOSIM_NPINS 32
struct gpiosim_softc {
struct device sc_dev;
u_int32_t sc_state;
struct gpio_chipset_tag sc_gpio_gc;
gpio_pin_t sc_gpio_pins[GPIOSIM_NPINS];
};
struct gpiosim_op {
void *cookie;
u_int32_t mask;
u_int32_t state;
};
#define GPIOSIMREAD _IOWR('G', 0, struct gpiosim_op)
#define GPIOSIMWRITE _IOW('G', 1, struct gpiosim_op)
int gpiosim_match(struct device *, void *, void *);
void gpiosim_attach(struct device *, struct device *, void *);
int gpiosim_ioctl(struct device *, u_long cmd, caddr_t data);
int gpiosim_pin_read(void *, int);
void gpiosim_pin_write(void *, int, int);
void gpiosim_pin_ctl(void *, int, int);
struct cfattach gpiosim_ca = {
sizeof(struct gpiosim_softc), gpiosim_match, gpiosim_attach
};
struct cfdriver gpiosim_cd = {
NULL, "gpiosim", DV_DULL
};
int
gpiosim_match(struct device *parent, void *match, void *aux)
{
return 1;
}
void
gpiosim_attach(struct device *parent, struct device *self, void *aux)
{
struct gpiosim_softc *sc = (void *)self;
struct gpiobus_attach_args gba;
int i;
/* initialize pin array */
for (i = 0; i < GPIOSIM_NPINS; i++) {
sc->sc_gpio_pins[i].pin_num = i;
sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT |
GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN |
GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN |
GPIO_PIN_INVIN | GPIO_PIN_INVOUT;
/* read initial state */
sc->sc_gpio_pins[i].pin_flags = GPIO_PIN_INPUT;
sc->sc_state = 0;
/* create controller tag */
sc->sc_gpio_gc.gp_cookie = sc;
sc->sc_gpio_gc.gp_pin_read = gpiosim_pin_read;
sc->sc_gpio_gc.gp_pin_write = gpiosim_pin_write;
sc->sc_gpio_gc.gp_pin_ctl = gpiosim_pin_ctl;
gba.gba_name = "gpio";
gba.gba_gc = &sc->sc_gpio_gc;
gba.gba_pins = sc->sc_gpio_pins;
gba.gba_npins = GPIOSIM_NPINS;
}
printf("\n");
config_found(&sc->sc_dev, &gba, gpiobus_print);
bio_register(&sc->sc_dev, gpiosim_ioctl);
}
int
gpiosim_ioctl(struct device *self, u_long cmd, caddr_t data)
{
struct gpiosim_softc *sc = (void *)self;
struct gpiosim_op *op = (void *)data;
switch (cmd) {
case GPIOSIMREAD:
op->state = sc->sc_state;
break;
case GPIOSIMWRITE:
sc->sc_state = (sc->sc_state & ~op->mask) |
(op->state & op->mask);
break;
}
return 0;
}
int
gpiosim_pin_read(void *arg, int pin)
{
struct gpiosim_softc *sc = (struct gpiosim_softc *)arg;
if (sc->sc_state & (1 << pin))
return GPIO_PIN_HIGH;
else
return GPIO_PIN_LOW;
}
void
gpiosim_pin_write(void *arg, int pin, int value)
{
struct gpiosim_softc *sc = (struct gpiosim_softc *)arg;
if (value == 0)
sc->sc_state &= ~(1 << pin);
else
sc->sc_state |= (1 << pin);
}
void
gpiosim_pin_ctl(void *arg, int pin, int flags)
{
struct gpiosim_softc *sc = (struct gpiosim_softc *)arg;
sc->sc_gpio_pins[pin].pin_flags = flags;
}
|
