2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "opt_platform.h"
32 #include <sys/param.h>
33 #include <sys/systm.h>
36 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
43 #include <dev/fdt/fdt_common.h>
44 #include <dev/ofw/ofw_bus.h>
47 #include <dev/gpio/gpiobusvar.h>
48 #include <dev/led/led.h>
50 #include "gpiobus_if.h"
53 * Only one pin for led
57 #define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
58 #define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
59 #define GPIOLED_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
60 device_get_nameunit((_sc)->sc_dev), "gpioled", MTX_DEF)
61 #define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
68 struct cdev *sc_leddev;
71 static void gpioled_control(void *, int);
72 static int gpioled_probe(device_t);
73 static int gpioled_attach(device_t);
74 static int gpioled_detach(device_t);
77 gpioled_control(void *priv, int onoff)
79 struct gpioled_softc *sc;
81 sc = (struct gpioled_softc *)priv;
83 if (GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
84 GPIO_PIN_OUTPUT) == 0) {
85 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
86 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
93 gpioled_identify(driver_t *driver, device_t bus)
95 phandle_t child, leds, root;
97 root = OF_finddevice("/");
100 for (leds = OF_child(root); leds != 0; leds = OF_peer(leds)) {
101 if (!fdt_is_compatible_strict(leds, "gpio-leds"))
103 /* Traverse the 'gpio-leds' node and add its children. */
104 for (child = OF_child(leds); child != 0; child = OF_peer(child)) {
105 if (!OF_hasprop(child, "gpios"))
107 if (ofw_gpiobus_add_fdt_child(bus, driver->name, child) == NULL)
115 gpioled_probe(device_t dev)
123 * We can match against our own node compatible string and also against
124 * our parent node compatible string. The first is normally used to
125 * describe leds on a gpiobus and the later when there is a common node
126 * compatible with 'gpio-leds' which is used to concentrate all the
127 * leds nodes on the dts.
130 if (ofw_bus_is_compatible(dev, "gpioled"))
134 if ((node = ofw_bus_get_node(dev)) == -1)
136 if ((node = OF_parent(node)) == -1)
138 if (OF_getprop_alloc(node, "compatible", 1,
139 (void **)&compat) == -1)
142 if (strcasecmp(compat, "gpio-leds") == 0)
145 OF_prop_free(compat);
151 device_set_desc(dev, "GPIO led");
153 return (BUS_PROBE_DEFAULT);
157 gpioled_attach(device_t dev)
159 struct gpioled_softc *sc;
169 sc = device_get_softc(dev);
171 sc->sc_busdev = device_get_parent(dev);
172 GPIOLED_LOCK_INIT(sc);
177 if ((node = ofw_bus_get_node(dev)) == -1)
180 if (OF_getprop_alloc(node, "default-state",
181 sizeof(char), (void **)&default_state) != -1) {
182 if (strcasecmp(default_state, "on") == 0)
184 else if (strcasecmp(default_state, "off") == 0)
186 else if (strcasecmp(default_state, "keep") == 0)
190 "unknown value for default-state in FDT\n");
192 OF_prop_free(default_state);
196 if (OF_getprop_alloc(node, "label", 1, (void **)&name) == -1)
197 OF_getprop_alloc(node, "name", 1, (void **)&name);
199 if (resource_string_value(device_get_name(dev),
200 device_get_unit(dev), "name", &name))
204 sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name :
205 device_get_nameunit(dev), state);
215 gpioled_detach(device_t dev)
217 struct gpioled_softc *sc;
219 sc = device_get_softc(dev);
221 led_destroy(sc->sc_leddev);
222 sc->sc_leddev = NULL;
224 GPIOLED_LOCK_DESTROY(sc);
228 static devclass_t gpioled_devclass;
230 static device_method_t gpioled_methods[] = {
231 /* Device interface */
233 DEVMETHOD(device_identify, gpioled_identify),
235 DEVMETHOD(device_probe, gpioled_probe),
236 DEVMETHOD(device_attach, gpioled_attach),
237 DEVMETHOD(device_detach, gpioled_detach),
242 static driver_t gpioled_driver = {
245 sizeof(struct gpioled_softc),
248 DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0);
249 MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);