1 | /* $NetBSD: gpioow.c,v 1.14 2011/09/07 07:43:05 mbalmer Exp $ */ |
2 | /* $OpenBSD: gpioow.c,v 1.1 2006/03/04 16:27:03 grange Exp $ */ |
3 | |
4 | /* |
5 | * Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org> |
6 | * |
7 | * Permission to use, copy, modify, and distribute this software for any |
8 | * purpose with or without fee is hereby granted, provided that the above |
9 | * copyright notice and this permission notice appear in all copies. |
10 | * |
11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
18 | */ |
19 | |
20 | #include <sys/cdefs.h> |
21 | __KERNEL_RCSID(0, "$NetBSD: gpioow.c,v 1.14 2011/09/07 07:43:05 mbalmer Exp $" ); |
22 | |
23 | /* |
24 | * 1-Wire bus bit-banging through GPIO pin. |
25 | */ |
26 | |
27 | #include <sys/param.h> |
28 | #include <sys/systm.h> |
29 | #include <sys/device.h> |
30 | #include <sys/gpio.h> |
31 | #include <sys/module.h> |
32 | |
33 | #include <dev/gpio/gpiovar.h> |
34 | |
35 | #include <dev/onewire/onewirevar.h> |
36 | |
37 | #define GPIOOW_NPINS 1 |
38 | #define GPIOOW_PIN_DATA 0 |
39 | |
40 | struct gpioow_softc { |
41 | void * sc_gpio; |
42 | struct gpio_pinmap sc_map; |
43 | int _map[GPIOOW_NPINS]; |
44 | |
45 | struct onewire_bus sc_ow_bus; |
46 | device_t sc_ow_dev; |
47 | |
48 | int sc_data; |
49 | int sc_dying; |
50 | }; |
51 | |
52 | int gpioow_match(device_t, cfdata_t, void *); |
53 | void gpioow_attach(device_t, device_t, void *); |
54 | int gpioow_detach(device_t, int); |
55 | int gpioow_activate(device_t, enum devact); |
56 | |
57 | int gpioow_ow_reset(void *); |
58 | int gpioow_ow_bit(void *, int); |
59 | |
60 | void gpioow_bb_rx(void *); |
61 | void gpioow_bb_tx(void *); |
62 | int gpioow_bb_get(void *); |
63 | void gpioow_bb_set(void *, int); |
64 | |
65 | CFATTACH_DECL_NEW(gpioow, sizeof(struct gpioow_softc), |
66 | gpioow_match, gpioow_attach, gpioow_detach, gpioow_activate); |
67 | |
68 | extern struct cfdriver gpioow_cd; |
69 | |
70 | static const struct onewire_bbops gpioow_bbops = { |
71 | gpioow_bb_rx, |
72 | gpioow_bb_tx, |
73 | gpioow_bb_get, |
74 | gpioow_bb_set |
75 | }; |
76 | |
77 | int |
78 | gpioow_match(device_t parent, cfdata_t cf, void *aux) |
79 | { |
80 | struct gpio_attach_args *ga = aux; |
81 | |
82 | if (strcmp(ga->ga_dvname, cf->cf_name)) |
83 | return 0; |
84 | |
85 | if (ga->ga_offset == -1) |
86 | return 0; |
87 | |
88 | /* Check that we have enough pins */ |
89 | if (gpio_npins(ga->ga_mask) != GPIOOW_NPINS) { |
90 | aprint_debug("%s: invalid pin mask 0x%02x\n" , cf->cf_name, |
91 | ga->ga_mask); |
92 | return 0; |
93 | } |
94 | return 1; |
95 | } |
96 | |
97 | void |
98 | gpioow_attach(device_t parent, device_t self, void *aux) |
99 | { |
100 | struct gpioow_softc *sc = device_private(self); |
101 | struct gpio_attach_args *ga = aux; |
102 | struct onewirebus_attach_args oba; |
103 | int caps; |
104 | |
105 | /* Map pins */ |
106 | sc->sc_gpio = ga->ga_gpio; |
107 | sc->sc_map.pm_map = sc->_map; |
108 | if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask, |
109 | &sc->sc_map)) { |
110 | aprint_error(": can't map pins\n" ); |
111 | goto finish; |
112 | } |
113 | |
114 | /* Configure data pin */ |
115 | caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA); |
116 | if (!(caps & GPIO_PIN_OUTPUT)) { |
117 | aprint_error(": data pin is unable to drive output\n" ); |
118 | gpio_pin_unmap(sc->sc_gpio, &sc->sc_map); |
119 | goto finish; |
120 | } |
121 | if (!(caps & GPIO_PIN_INPUT)) { |
122 | aprint_error(": data pin is unable to read input\n" ); |
123 | gpio_pin_unmap(sc->sc_gpio, &sc->sc_map); |
124 | goto finish; |
125 | } |
126 | aprint_normal(": DATA[%d]" , sc->sc_map.pm_map[GPIOOW_PIN_DATA]); |
127 | sc->sc_data = GPIO_PIN_OUTPUT; |
128 | if (caps & GPIO_PIN_OPENDRAIN) { |
129 | aprint_normal(" open-drain" ); |
130 | sc->sc_data |= GPIO_PIN_OPENDRAIN; |
131 | } else if ((caps & GPIO_PIN_PUSHPULL) && (caps & GPIO_PIN_TRISTATE)) { |
132 | aprint_normal(" push-pull tri-state" ); |
133 | sc->sc_data |= GPIO_PIN_PUSHPULL; |
134 | } |
135 | if (caps & GPIO_PIN_PULLUP) { |
136 | aprint_normal(" pull-up" ); |
137 | sc->sc_data |= GPIO_PIN_PULLUP; |
138 | } |
139 | gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, sc->sc_data); |
140 | |
141 | aprint_normal("\n" ); |
142 | |
143 | /* Attach 1-Wire bus */ |
144 | sc->sc_ow_bus.bus_cookie = sc; |
145 | sc->sc_ow_bus.bus_reset = gpioow_ow_reset; |
146 | sc->sc_ow_bus.bus_bit = gpioow_ow_bit; |
147 | |
148 | memset(&oba, 0, sizeof(oba)); |
149 | oba.oba_bus = &sc->sc_ow_bus; |
150 | sc->sc_ow_dev = config_found(self, &oba, onewirebus_print); |
151 | |
152 | if (!pmf_device_register(self, NULL, NULL)) |
153 | aprint_error("%s: could not establish power handler\n" , |
154 | device_xname(self)); |
155 | finish: |
156 | return; |
157 | } |
158 | |
159 | int |
160 | gpioow_detach(device_t self, int flags) |
161 | { |
162 | struct gpioow_softc *sc = device_private(self); |
163 | int rv = 0; |
164 | |
165 | if (sc->sc_ow_dev != NULL) |
166 | rv = config_detach(sc->sc_ow_dev, flags); |
167 | |
168 | if (!rv) { |
169 | gpio_pin_unmap(sc->sc_gpio, &sc->sc_map); |
170 | pmf_device_deregister(self); |
171 | } |
172 | return rv; |
173 | } |
174 | |
175 | int |
176 | gpioow_activate(device_t self, enum devact act) |
177 | { |
178 | struct gpioow_softc *sc = device_private(self); |
179 | |
180 | switch (act) { |
181 | case DVACT_DEACTIVATE: |
182 | sc->sc_dying = 1; |
183 | return 0; |
184 | default: |
185 | return EOPNOTSUPP; |
186 | } |
187 | } |
188 | |
189 | int |
190 | gpioow_ow_reset(void *arg) |
191 | { |
192 | return (onewire_bb_reset(&gpioow_bbops, arg)); |
193 | } |
194 | |
195 | int |
196 | gpioow_ow_bit(void *arg, int value) |
197 | { |
198 | return (onewire_bb_bit(&gpioow_bbops, arg, value)); |
199 | } |
200 | |
201 | void |
202 | gpioow_bb_rx(void *arg) |
203 | { |
204 | struct gpioow_softc *sc = arg; |
205 | int data = sc->sc_data; |
206 | |
207 | data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); |
208 | data |= GPIO_PIN_INPUT; |
209 | if (data & GPIO_PIN_PUSHPULL) |
210 | data |= GPIO_PIN_TRISTATE; |
211 | if (sc->sc_data != data) { |
212 | sc->sc_data = data; |
213 | gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, |
214 | sc->sc_data); |
215 | } |
216 | } |
217 | |
218 | void |
219 | gpioow_bb_tx(void *arg) |
220 | { |
221 | struct gpioow_softc *sc = arg; |
222 | int data = sc->sc_data; |
223 | |
224 | data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); |
225 | data |= GPIO_PIN_OUTPUT; |
226 | if (sc->sc_data != data) { |
227 | sc->sc_data = data; |
228 | gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, |
229 | sc->sc_data); |
230 | } |
231 | } |
232 | |
233 | int |
234 | gpioow_bb_get(void *arg) |
235 | { |
236 | struct gpioow_softc *sc = arg; |
237 | |
238 | return (gpio_pin_read(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA) == |
239 | GPIO_PIN_HIGH ? 1 : 0); |
240 | } |
241 | |
242 | void |
243 | gpioow_bb_set(void *arg, int value) |
244 | { |
245 | struct gpioow_softc *sc = arg; |
246 | |
247 | gpio_pin_write(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, |
248 | value ? GPIO_PIN_HIGH : GPIO_PIN_LOW); |
249 | } |
250 | |
251 | MODULE(MODULE_CLASS_DRIVER, gpioow, "gpio,onewire" ); |
252 | |
253 | #ifdef _MODULE |
254 | #include "ioconf.c" |
255 | #endif |
256 | |
257 | static int |
258 | gpioow_modcmd(modcmd_t cmd, void *opaque) |
259 | { |
260 | int error; |
261 | |
262 | error = 0; |
263 | switch (cmd) { |
264 | case MODULE_CMD_INIT: |
265 | #ifdef _MODULE |
266 | error = config_init_component(cfdriver_ioconf_gpioow, |
267 | cfattach_ioconf_gpioow, cfdata_ioconf_gpioow); |
268 | if (error) |
269 | aprint_error("%s: unable to init component\n" , |
270 | gpioow_cd.cd_name); |
271 | #endif |
272 | break; |
273 | case MODULE_CMD_FINI: |
274 | #ifdef _MODULE |
275 | config_fini_component(cfdriver_ioconf_gpioow, |
276 | cfattach_ioconf_gpioow, cfdata_ioconf_gpioow); |
277 | #endif |
278 | break; |
279 | default: |
280 | error = ENOTTY; |
281 | } |
282 | return error; |
283 | } |
284 | |