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__FBSDID("$FreeBSD$"); 29 30#include "opt_platform.h" 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/bus.h> 35#include <sys/gpio.h> 36#include <sys/kernel.h> 37#include <sys/lock.h> 38#include <sys/malloc.h> 39#include <sys/module.h> 40#include <sys/mutex.h> 41 42#ifdef FDT 43#include <dev/fdt/fdt_common.h> 44#include <dev/ofw/ofw_bus.h> 45#endif 46 47#include <dev/gpio/gpiobusvar.h> 48#include <dev/led/led.h> 49 50#include "gpiobus_if.h" 51 52/* 53 * Only one pin for led 54 */ 55#define GPIOLED_PIN 0 56 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) \ 60 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 61 "gpioled", MTX_DEF) 62#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 63 64struct gpioled_softc 65{ 66 device_t sc_dev; 67 device_t sc_busdev; 68 struct mtx sc_mtx; 69 struct cdev *sc_leddev; 70}; 71 72static void gpioled_control(void *, int); 73static int gpioled_probe(device_t); 74static int gpioled_attach(device_t); 75static int gpioled_detach(device_t); 76 77static void 78gpioled_control(void *priv, int onoff) 79{ 80 int error; 81 struct gpioled_softc *sc; 82 83 sc = (struct gpioled_softc *)priv; 84 GPIOLED_LOCK(sc); 85 error = GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev, 86 GPIOBUS_DONTWAIT); 87 if (error != 0) { 88 GPIOLED_UNLOCK(sc); 89 return; 90 } 91 error = GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, 92 GPIOLED_PIN, GPIO_PIN_OUTPUT); 93 if (error == 0) 94 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 95 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW); 96 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev); 97 GPIOLED_UNLOCK(sc); 98} 99 100#ifdef FDT 101static void 102gpioled_identify(driver_t *driver, device_t bus) 103{ 104 phandle_t child, leds, root; 105 106 root = OF_finddevice("/"); 107 if (root == 0) 108 return; 109 leds = fdt_find_compatible(root, "gpio-leds", 1); 110 if (leds == 0) 111 return; 112 113 /* Traverse the 'gpio-leds' node and add its children. */ 114 for (child = OF_child(leds); child != 0; child = OF_peer(child)) 115 if (ofw_gpiobus_add_fdt_child(bus, child) == NULL) 116 continue; 117} 118#endif 119 120static int 121gpioled_probe(device_t dev) 122{ 123#ifdef FDT 124 int match; 125 phandle_t node; 126 char *compat; 127 128 /* 129 * We can match against our own node compatible string and also against 130 * our parent node compatible string. The first is normally used to 131 * describe leds on a gpiobus and the later when there is a common node 132 * compatible with 'gpio-leds' which is used to concentrate all the 133 * leds nodes on the dts. 134 */ 135 match = 0; 136 if (ofw_bus_is_compatible(dev, "gpioled")) 137 match = 1; 138 139 if (match == 0) { 140 if ((node = ofw_bus_get_node(dev)) == -1) 141 return (ENXIO); 142 if ((node = OF_parent(node)) == -1) 143 return (ENXIO); 144 if (OF_getprop_alloc(node, "compatible", 1, 145 (void **)&compat) == -1) 146 return (ENXIO); 147 148 if (strcasecmp(compat, "gpio-leds") == 0) 149 match = 1; 150 151 free(compat, M_OFWPROP); 152 } 153 154 if (match == 0) 155 return (ENXIO); 156#endif 157 device_set_desc(dev, "GPIO led"); 158 159 return (0); 160} 161 162static int 163gpioled_attach(device_t dev) 164{ 165 struct gpioled_softc *sc; 166#ifdef FDT 167 phandle_t node; 168 char *name; 169#else 170 const char *name; 171#endif 172 173 sc = device_get_softc(dev); 174 sc->sc_dev = dev; 175 sc->sc_busdev = device_get_parent(dev); 176 GPIOLED_LOCK_INIT(sc); 177#ifdef FDT 178 name = NULL; 179 if ((node = ofw_bus_get_node(dev)) == -1) 180 return (ENXIO); 181 if (OF_getprop_alloc(node, "label", 1, (void **)&name) == -1) 182 OF_getprop_alloc(node, "name", 1, (void **)&name); 183#else 184 if (resource_string_value(device_get_name(dev), 185 device_get_unit(dev), "name", &name)) 186 name = NULL; 187#endif 188 189 sc->sc_leddev = led_create(gpioled_control, sc, name ? name : 190 device_get_nameunit(dev)); 191#ifdef FDT 192 if (name != NULL) 193 free(name, M_OFWPROP); 194#endif 195 196 return (0); 197} 198 199static int 200gpioled_detach(device_t dev) 201{ 202 struct gpioled_softc *sc; 203 204 sc = device_get_softc(dev); 205 if (sc->sc_leddev) { 206 led_destroy(sc->sc_leddev); 207 sc->sc_leddev = NULL; 208 } 209 GPIOLED_LOCK_DESTROY(sc); 210 return (0); 211} 212 213static devclass_t gpioled_devclass; 214 215static device_method_t gpioled_methods[] = { 216 /* Device interface */ 217#ifdef FDT 218 DEVMETHOD(device_identify, gpioled_identify), 219#endif 220 DEVMETHOD(device_probe, gpioled_probe), 221 DEVMETHOD(device_attach, gpioled_attach), 222 DEVMETHOD(device_detach, gpioled_detach), 223 224 { 0, 0 } 225}; 226 227static driver_t gpioled_driver = { 228 "gpioled", 229 gpioled_methods, 230 sizeof(struct gpioled_softc), 231}; 232 233DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0); 234