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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/* $OpenBSD: gpioow.c,v 1.3 2008/11/24 12:12:12 mbalmer Exp $ */
/*
* Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
*
* 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 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.
*/
/*
* 1-Wire bus bit-banging through GPIO pin.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <dev/gpio/gpiovar.h>
#include <dev/onewire/onewirevar.h>
#define GPIOOW_NPINS 1
#define GPIOOW_PIN_DATA 0
struct gpioow_softc {
struct device sc_dev;
void * sc_gpio;
struct gpio_pinmap sc_map;
int __map[GPIOOW_NPINS];
struct onewire_bus sc_ow_bus;
struct device * sc_ow_dev;
int sc_data;
int sc_dying;
};
int gpioow_match(struct device *, void *, void *);
void gpioow_attach(struct device *, struct device *, void *);
int gpioow_detach(struct device *, int);
int gpioow_activate(struct device *, enum devact);
int gpioow_ow_reset(void *);
int gpioow_ow_bit(void *, int);
void gpioow_bb_rx(void *);
void gpioow_bb_tx(void *);
int gpioow_bb_get(void *);
void gpioow_bb_set(void *, int);
struct cfattach gpioow_ca = {
sizeof(struct gpioow_softc),
gpioow_match,
gpioow_attach,
gpioow_detach,
gpioow_activate
};
struct cfdriver gpioow_cd = {
NULL, "gpioow", DV_DULL
};
static const struct onewire_bbops gpioow_bbops = {
gpioow_bb_rx,
gpioow_bb_tx,
gpioow_bb_get,
gpioow_bb_set
};
int
gpioow_match(struct device *parent, void *match, void *aux)
{
struct cfdata *cf = match;
struct gpio_attach_args *ga = aux;
if (ga->ga_offset == -1)
return 0;
return (strcmp(cf->cf_driver->cd_name, "gpioow") == 0);
}
void
gpioow_attach(struct device *parent, struct device *self, void *aux)
{
struct gpioow_softc *sc = (struct gpioow_softc *)self;
struct gpio_attach_args *ga = aux;
struct onewirebus_attach_args oba;
int caps;
/* Check that we have enough pins */
if (gpio_npins(ga->ga_mask) != GPIOOW_NPINS) {
printf(": invalid pin mask\n");
return;
}
/* Map pins */
sc->sc_gpio = ga->ga_gpio;
sc->sc_map.pm_map = sc->__map;
if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask,
&sc->sc_map)) {
printf(": can't map pins\n");
return;
}
/* Configure data pin */
caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA);
if (!(caps & GPIO_PIN_OUTPUT)) {
printf(": data pin is unable to drive output\n");
goto fail;
}
if (!(caps & GPIO_PIN_INPUT)) {
printf(": data pin is unable to read input\n");
goto fail;
}
printf(": DATA[%d]", sc->sc_map.pm_map[GPIOOW_PIN_DATA]);
sc->sc_data = GPIO_PIN_OUTPUT;
if (caps & GPIO_PIN_OPENDRAIN) {
printf(" open-drain");
sc->sc_data |= GPIO_PIN_OPENDRAIN;
} else if ((caps & GPIO_PIN_PUSHPULL) && (caps & GPIO_PIN_TRISTATE)) {
printf(" push-pull tri-state");
sc->sc_data |= GPIO_PIN_PUSHPULL;
}
if (caps & GPIO_PIN_PULLUP) {
printf(" pull-up");
sc->sc_data |= GPIO_PIN_PULLUP;
}
gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, sc->sc_data);
printf("\n");
/* Attach 1-Wire bus */
sc->sc_ow_bus.bus_cookie = sc;
sc->sc_ow_bus.bus_reset = gpioow_ow_reset;
sc->sc_ow_bus.bus_bit = gpioow_ow_bit;
bzero(&oba, sizeof(oba));
oba.oba_bus = &sc->sc_ow_bus;
sc->sc_ow_dev = config_found(self, &oba, onewirebus_print);
return;
fail:
gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
}
int
gpioow_detach(struct device *self, int flags)
{
struct gpioow_softc *sc = (struct gpioow_softc *)self;
int rv = 0;
gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
if (sc->sc_ow_dev != NULL)
rv = config_detach(sc->sc_ow_dev, flags);
return (rv);
}
int
gpioow_activate(struct device *self, enum devact act)
{
struct gpioow_softc *sc = (struct gpioow_softc *)self;
int rv = 0;
switch (act) {
case DVACT_ACTIVATE:
break;
case DVACT_DEACTIVATE:
sc->sc_dying = 1;
if (sc->sc_ow_dev != NULL)
rv = config_deactivate(sc->sc_ow_dev);
break;
}
return (rv);
}
int
gpioow_ow_reset(void *arg)
{
return (onewire_bb_reset(&gpioow_bbops, arg));
}
int
gpioow_ow_bit(void *arg, int value)
{
return (onewire_bb_bit(&gpioow_bbops, arg, value));
}
void
gpioow_bb_rx(void *arg)
{
struct gpioow_softc *sc = arg;
int data = sc->sc_data;
data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE);
data |= GPIO_PIN_INPUT;
if (data & GPIO_PIN_PUSHPULL)
data |= GPIO_PIN_TRISTATE;
if (sc->sc_data != data) {
sc->sc_data = data;
gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA,
sc->sc_data);
}
}
void
gpioow_bb_tx(void *arg)
{
struct gpioow_softc *sc = arg;
int data = sc->sc_data;
data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE);
data |= GPIO_PIN_OUTPUT;
if (sc->sc_data != data) {
sc->sc_data = data;
gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA,
sc->sc_data);
}
}
int
gpioow_bb_get(void *arg)
{
struct gpioow_softc *sc = arg;
return (gpio_pin_read(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA) ==
GPIO_PIN_HIGH ? 1 : 0);
}
void
gpioow_bb_set(void *arg, int value)
{
struct gpioow_softc *sc = arg;
gpio_pin_write(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA,
value ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
}
|
