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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/* $NetBSD: gpiosim.c,v 1.7 2009/12/06 22:33:44 dyoung Exp $ */
/* $OpenBSD: gpiosim.c,v 1.1 2008/11/23 18:46:49 mbalmer Exp $ */
/*
* Copyright (c) 2007, 2008, 2009 Marc Balmer <marc@msys.ch>
* 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>
#define GPIOSIM_NPINS 32
struct gpiosim_softc {
device_t sc_dev;
device_t sc_gdev; /* gpio that attaches here */
u_int32_t sc_state;
struct gpio_chipset_tag sc_gpio_gc;
gpio_pin_t sc_gpio_pins[GPIOSIM_NPINS];
struct sysctllog *sc_log;
};
int gpiosim_match(device_t, cfdata_t, void *);
void gpiosimattach(int);
void gpiosim_attach(device_t, device_t, void *);
int gpiosim_detach(device_t, int);
int gpiosim_sysctl(SYSCTLFN_PROTO);
int gpiosim_pin_read(void *, int);
void gpiosim_pin_write(void *, int, int);
void gpiosim_pin_ctl(void *, int, int);
CFATTACH_DECL_NEW(gpiosim, sizeof(struct gpiosim_softc), gpiosim_match,
gpiosim_attach, gpiosim_detach, NULL);
extern struct cfdriver gpiosim_cd;
int
gpiosim_match(device_t parent, cfdata_t match, void *aux)
{
return 1;
}
void
gpiosimattach(int num)
{
cfdata_t cf;
int n, err;
err = config_cfattach_attach(gpiosim_cd.cd_name, &gpiosim_ca);
if (err)
printf("%s: unable to register cfattach\n", gpiosim_cd.cd_name);
for (n = 0; n < num; n++) {
cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK);
cf->cf_name = "gpiosim";
cf->cf_atname = "gpiosim";
cf->cf_unit = n;
cf->cf_fstate = FSTATE_NOTFOUND;
config_attach_pseudo(cf);
}
}
void
gpiosim_attach(device_t parent, device_t self, void *aux)
{
struct gpiosim_softc *sc = device_private(self);
struct gpiobus_attach_args gba;
const struct sysctlnode *node;
int i;
sc->sc_dev = self;
printf("%s", device_xname(sc->sc_dev));
/* 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;
}
pmf_device_register(self, NULL, NULL);
sysctl_createv(NULL, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "hw", NULL,
NULL, 0, NULL, 0,
CTL_HW, CTL_EOL);
sysctl_createv(&sc->sc_log, 0, NULL, &node,
0,
CTLTYPE_NODE, device_xname(sc->sc_dev),
SYSCTL_DESCR("GPIO simulator"),
NULL, 0, NULL, 0,
CTL_HW, CTL_CREATE, CTL_EOL);
if (node == NULL) {
printf(": can't create sysctl node\n");
return;
}
sysctl_createv(&sc->sc_log, 0, &node, NULL,
CTLFLAG_READWRITE,
CTLTYPE_INT, "value",
SYSCTL_DESCR("Current GPIO simulator value"),
gpiosim_sysctl, 0, sc, 0,
CTL_CREATE, CTL_EOL);
printf(": simulating %d pins\n", GPIOSIM_NPINS);
sc->sc_gdev = config_found_ia(self, "gpiobus", &gba, gpiobus_print);
}
int
gpiosim_detach(device_t self, int flags)
{
struct gpiosim_softc *sc = device_private(self);
/* Detach the gpio driver that attached here */
if (sc->sc_gdev != NULL)
config_detach(sc->sc_gdev, 0);
pmf_device_deregister(self);
if (sc->sc_log != NULL) {
sysctl_teardown(&sc->sc_log);
sc->sc_log = NULL;
}
return 0;
}
int
gpiosim_sysctl(SYSCTLFN_ARGS)
{
struct sysctlnode node;
struct gpiosim_softc *sc;
int val, error;
node = *rnode;
sc = node.sysctl_data;
node.sysctl_data = &val;
val = sc->sc_state;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
sc->sc_state = val;
return 0;
}
int
gpiosim_pin_read(void *arg, int pin)
{
struct gpiosim_softc *sc = 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 = 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 = arg;
sc->sc_gpio_pins[pin].pin_flags = flags;
}
|