gpioled.c revision 273917
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: head/sys/dev/gpio/gpioled.c 273917 2014-10-31 19:15:14Z loos $"); 29 30#include "opt_platform.h" 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/bio.h> 35#include <sys/bus.h> 36#include <sys/conf.h> 37#include <sys/kernel.h> 38#include <sys/kthread.h> 39#include <sys/lock.h> 40#include <sys/malloc.h> 41#include <sys/module.h> 42#include <sys/mutex.h> 43 44#ifdef FDT 45#include <dev/fdt/fdt_common.h> 46#include <dev/gpio/gpiobusvar.h> 47#include <dev/ofw/ofw_bus.h> 48#endif 49 50#include <dev/led/led.h> 51#include <sys/gpio.h> 52#include "gpiobus_if.h" 53 54/* 55 * Only one pin for led 56 */ 57#define GPIOLED_PIN 0 58 59#define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 60#define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 61#define GPIOLED_LOCK_INIT(_sc) \ 62 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 63 "gpioled", MTX_DEF) 64#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 65 66struct gpioled_softc 67{ 68 device_t sc_dev; 69 device_t sc_busdev; 70 struct mtx sc_mtx; 71 struct cdev *sc_leddev; 72}; 73 74static void gpioled_control(void *, int); 75static int gpioled_probe(device_t); 76static int gpioled_attach(device_t); 77static int gpioled_detach(device_t); 78 79static void 80gpioled_control(void *priv, int onoff) 81{ 82 int error; 83 struct gpioled_softc *sc; 84 85 sc = (struct gpioled_softc *)priv; 86 GPIOLED_LOCK(sc); 87 error = GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev, 88 GPIOBUS_DONTWAIT); 89 if (error != 0) { 90 GPIOLED_UNLOCK(sc); 91 return; 92 } 93 error = GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, 94 GPIOLED_PIN, GPIO_PIN_OUTPUT); 95 if (error == 0) 96 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 97 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW); 98 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev); 99 GPIOLED_UNLOCK(sc); 100} 101 102#ifdef FDT 103static void 104gpioled_identify(driver_t *driver, device_t bus) 105{ 106 phandle_t child, leds, root; 107 108 root = OF_finddevice("/"); 109 if (root == 0) 110 return; 111 leds = fdt_find_compatible(root, "gpio-leds", 1); 112 if (leds == 0) 113 return; 114 115 /* Traverse the 'gpio-leds' node and add its children. */ 116 for (child = OF_child(leds); child != 0; child = OF_peer(child)) 117 if (ofw_gpiobus_add_fdt_child(bus, child) == NULL) 118 continue; 119} 120#endif 121 122static int 123gpioled_probe(device_t dev) 124{ 125#ifdef FDT 126 int match; 127 phandle_t node; 128 char *compat; 129 130 /* 131 * We can match against our own node compatible string and also against 132 * our parent node compatible string. The first is normally used to 133 * describe leds on a gpiobus and the later when there is a common node 134 * compatible with 'gpio-leds' which is used to concentrate all the 135 * leds nodes on the dts. 136 */ 137 match = 0; 138 if (ofw_bus_is_compatible(dev, "gpioled")) 139 match = 1; 140 141 if (match == 0) { 142 if ((node = ofw_bus_get_node(dev)) == -1) 143 return (ENXIO); 144 if ((node = OF_parent(node)) == -1) 145 return (ENXIO); 146 if (OF_getprop_alloc(node, "compatible", 1, 147 (void **)&compat) == -1) 148 return (ENXIO); 149 150 if (strcasecmp(compat, "gpio-leds") == 0) 151 match = 1; 152 153 free(compat, M_OFWPROP); 154 } 155 156 if (match == 0) 157 return (ENXIO); 158#endif 159 device_set_desc(dev, "GPIO led"); 160 161 return (0); 162} 163 164static int 165gpioled_attach(device_t dev) 166{ 167 struct gpioled_softc *sc; 168#ifdef FDT 169 phandle_t node; 170 char *name; 171#else 172 const char *name; 173#endif 174 175 sc = device_get_softc(dev); 176 sc->sc_dev = dev; 177 sc->sc_busdev = device_get_parent(dev); 178 GPIOLED_LOCK_INIT(sc); 179#ifdef FDT 180 name = NULL; 181 if ((node = ofw_bus_get_node(dev)) == -1) 182 return (ENXIO); 183 if (OF_getprop_alloc(node, "label", 1, (void **)&name) == -1) 184 OF_getprop_alloc(node, "name", 1, (void **)&name); 185#else 186 if (resource_string_value(device_get_name(dev), 187 device_get_unit(dev), "name", &name)) 188 name = NULL; 189#endif 190 191 sc->sc_leddev = led_create(gpioled_control, sc, name ? name : 192 device_get_nameunit(dev)); 193#ifdef FDT 194 if (name != NULL) 195 free(name, M_OFWPROP); 196#endif 197 198 return (0); 199} 200 201static int 202gpioled_detach(device_t dev) 203{ 204 struct gpioled_softc *sc; 205 206 sc = device_get_softc(dev); 207 if (sc->sc_leddev) { 208 led_destroy(sc->sc_leddev); 209 sc->sc_leddev = NULL; 210 } 211 GPIOLED_LOCK_DESTROY(sc); 212 return (0); 213} 214 215static devclass_t gpioled_devclass; 216 217static device_method_t gpioled_methods[] = { 218 /* Device interface */ 219#ifdef FDT 220 DEVMETHOD(device_identify, gpioled_identify), 221#endif 222 DEVMETHOD(device_probe, gpioled_probe), 223 DEVMETHOD(device_attach, gpioled_attach), 224 DEVMETHOD(device_detach, gpioled_detach), 225 226 { 0, 0 } 227}; 228 229static driver_t gpioled_driver = { 230 "gpioled", 231 gpioled_methods, 232 sizeof(struct gpioled_softc), 233}; 234 235DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0); 236