1 /*-
2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 #include "opt_platform.h"
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33 #include <sys/gpio.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/mutex.h>
39
40 #include <dev/fdt/fdt_common.h>
41 #include <dev/ofw/ofw_bus.h>
42
43 #include <dev/gpio/gpiobusvar.h>
44 #include <dev/led/led.h>
45
46 #include "gpiobus_if.h"
47
48 struct gpioled
49 {
50 struct gpioleds_softc *parent_sc;
51 gpio_pin_t pin;
52 struct cdev *leddev;
53 };
54
55 struct gpioleds_softc
56 {
57 device_t sc_dev;
58 device_t sc_busdev;
59 struct gpioled *sc_leds;
60 int sc_total_leds;
61 };
62
63 static void gpioled_control(void *, int);
64 static int gpioled_probe(device_t);
65 static int gpioled_attach(device_t);
66 static int gpioled_detach(device_t);
67
68 static void
gpioled_control(void * priv,int onoff)69 gpioled_control(void *priv, int onoff)
70 {
71 struct gpioled *led;
72
73 led = (struct gpioled *)priv;
74 if (led->pin)
75 gpio_pin_set_active(led->pin, onoff);
76 }
77
78 static void
gpioleds_attach_led(struct gpioleds_softc * sc,phandle_t node,struct gpioled * led)79 gpioleds_attach_led(struct gpioleds_softc *sc, phandle_t node,
80 struct gpioled *led)
81 {
82 char *name;
83 int state, err;
84 char *default_state;
85
86 led->parent_sc = sc;
87
88 state = 0;
89 if (OF_getprop_alloc(node, "default-state",
90 (void **)&default_state) != -1) {
91 if (strcasecmp(default_state, "on") == 0)
92 state = 1;
93 else if (strcasecmp(default_state, "off") == 0)
94 state = 0;
95 else if (strcasecmp(default_state, "keep") == 0)
96 state = -1;
97 else {
98 state = -1;
99 device_printf(sc->sc_dev,
100 "unknown value for default-state in FDT\n");
101 }
102 OF_prop_free(default_state);
103 }
104
105 name = NULL;
106 if (OF_getprop_alloc(node, "label", (void **)&name) == -1)
107 OF_getprop_alloc(node, "name", (void **)&name);
108
109 if (name == NULL) {
110 device_printf(sc->sc_dev,
111 "no name provided for gpio LED, skipping\n");
112 return;
113 }
114
115 err = gpio_pin_get_by_ofw_idx(sc->sc_dev, node, 0, &led->pin);
116 if (err) {
117 device_printf(sc->sc_dev, "<%s> failed to map pin\n", name);
118 if (name)
119 OF_prop_free(name);
120 return;
121 }
122 gpio_pin_setflags(led->pin, GPIO_PIN_OUTPUT);
123
124 led->leddev = led_create_state(gpioled_control, led, name,
125 state);
126
127 if (name != NULL)
128 OF_prop_free(name);
129 }
130
131 static void
gpioleds_detach_led(struct gpioled * led)132 gpioleds_detach_led(struct gpioled *led)
133 {
134
135 if (led->leddev != NULL)
136 led_destroy(led->leddev);
137
138 if (led->pin)
139 gpio_pin_release(led->pin);
140 }
141
142 static int
gpioled_probe(device_t dev)143 gpioled_probe(device_t dev)
144 {
145 if (!ofw_bus_status_okay(dev))
146 return (ENXIO);
147 if (!ofw_bus_is_compatible(dev, "gpio-leds"))
148 return (ENXIO);
149
150 device_set_desc(dev, "GPIO LEDs");
151
152 return (BUS_PROBE_DEFAULT);
153 }
154
155 static int
gpioled_attach(device_t dev)156 gpioled_attach(device_t dev)
157 {
158 struct gpioleds_softc *sc;
159 phandle_t child, leds;
160 int total_leds;
161
162 if ((leds = ofw_bus_get_node(dev)) == -1)
163 return (ENXIO);
164
165 sc = device_get_softc(dev);
166 sc->sc_dev = dev;
167 sc->sc_busdev = device_get_parent(dev);
168
169 /* Traverse the 'gpio-leds' node and count leds */
170 total_leds = 0;
171 for (child = OF_child(leds); child != 0; child = OF_peer(child)) {
172 if (!OF_hasprop(child, "gpios"))
173 continue;
174 total_leds++;
175 }
176
177 if (total_leds) {
178 sc->sc_leds = malloc(sizeof(struct gpioled) * total_leds,
179 M_DEVBUF, M_WAITOK | M_ZERO);
180
181 sc->sc_total_leds = 0;
182 /* Traverse the 'gpio-leds' node and count leds */
183 for (child = OF_child(leds); child != 0; child = OF_peer(child)) {
184 if (!OF_hasprop(child, "gpios"))
185 continue;
186 gpioleds_attach_led(sc, child, &sc->sc_leds[sc->sc_total_leds]);
187 sc->sc_total_leds++;
188 }
189 }
190
191 return (0);
192 }
193
194 static int
gpioled_detach(device_t dev)195 gpioled_detach(device_t dev)
196 {
197 struct gpioleds_softc *sc;
198 int i;
199
200 sc = device_get_softc(dev);
201
202 for (i = 0; i < sc->sc_total_leds; i++)
203 gpioleds_detach_led(&sc->sc_leds[i]);
204
205 if (sc->sc_leds)
206 free(sc->sc_leds, M_DEVBUF);
207
208 return (0);
209 }
210
211 static device_method_t gpioled_methods[] = {
212 /* Device interface */
213 DEVMETHOD(device_probe, gpioled_probe),
214 DEVMETHOD(device_attach, gpioled_attach),
215 DEVMETHOD(device_detach, gpioled_detach),
216
217 DEVMETHOD_END
218 };
219
220 static driver_t gpioled_driver = {
221 "gpioled",
222 gpioled_methods,
223 sizeof(struct gpioleds_softc),
224 };
225
226 DRIVER_MODULE(gpioled, ofwbus, gpioled_driver, 0, 0);
227 DRIVER_MODULE(gpioled, simplebus, gpioled_driver, 0, 0);
228 MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);
229