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 64 struct 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 72 static void gpioled_control(void *, int); 73 static int gpioled_probe(device_t); 74 static int gpioled_attach(device_t); 75 static int gpioled_detach(device_t); 76 77 static void 78 gpioled_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 101 static void 102 gpioled_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 for (leds = OF_child(root); leds != 0; leds = OF_peer(leds)) { 110 if (!fdt_is_compatible_strict(leds, "gpio-leds")) 111 continue; 112 /* Traverse the 'gpio-leds' node and add its children. */ 113 for (child = OF_child(leds); child != 0; child = OF_peer(child)) { 114 if (!OF_hasprop(child, "gpios")) 115 continue; 116 if (ofw_gpiobus_add_fdt_child(bus, driver->name, child) == NULL) 117 continue; 118 } 119 } 120 } 121 #endif 122 123 static int 124 gpioled_probe(device_t dev) 125 { 126 #ifdef FDT 127 int match; 128 phandle_t node; 129 char *compat; 130 131 /* 132 * We can match against our own node compatible string and also against 133 * our parent node compatible string. The first is normally used to 134 * describe leds on a gpiobus and the later when there is a common node 135 * compatible with 'gpio-leds' which is used to concentrate all the 136 * leds nodes on the dts. 137 */ 138 match = 0; 139 if (ofw_bus_is_compatible(dev, "gpioled")) 140 match = 1; 141 142 if (match == 0) { 143 if ((node = ofw_bus_get_node(dev)) == -1) 144 return (ENXIO); 145 if ((node = OF_parent(node)) == -1) 146 return (ENXIO); 147 if (OF_getprop_alloc(node, "compatible", 1, 148 (void **)&compat) == -1) 149 return (ENXIO); 150 151 if (strcasecmp(compat, "gpio-leds") == 0) 152 match = 1; 153 154 OF_prop_free(compat); 155 } 156 157 if (match == 0) 158 return (ENXIO); 159 #endif 160 device_set_desc(dev, "GPIO led"); 161 162 return (0); 163 } 164 165 static int 166 gpioled_attach(device_t dev) 167 { 168 struct gpioled_softc *sc; 169 int state; 170 #ifdef FDT 171 phandle_t node; 172 char *default_state; 173 char *name; 174 #else 175 const char *name; 176 #endif 177 178 sc = device_get_softc(dev); 179 sc->sc_dev = dev; 180 sc->sc_busdev = device_get_parent(dev); 181 GPIOLED_LOCK_INIT(sc); 182 183 state = 0; 184 185 #ifdef FDT 186 if ((node = ofw_bus_get_node(dev)) == -1) 187 return (ENXIO); 188 189 if (OF_getprop_alloc(node, "default-state", 190 sizeof(char), (void **)&default_state) != -1) { 191 if (strcasecmp(default_state, "on") == 0) 192 state = 1; 193 else if (strcasecmp(default_state, "off") == 0) 194 state = 0; 195 else if (strcasecmp(default_state, "keep") == 0) 196 state = -1; 197 else { 198 device_printf(dev, 199 "unknown value for default-state in FDT\n"); 200 } 201 OF_prop_free(default_state); 202 } 203 204 name = NULL; 205 if (OF_getprop_alloc(node, "label", 1, (void **)&name) == -1) 206 OF_getprop_alloc(node, "name", 1, (void **)&name); 207 #else 208 if (resource_string_value(device_get_name(dev), 209 device_get_unit(dev), "name", &name)) 210 name = NULL; 211 #endif 212 213 sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name : 214 device_get_nameunit(dev), state); 215 #ifdef FDT 216 if (name != NULL) 217 OF_prop_free(name); 218 #endif 219 220 return (0); 221 } 222 223 static int 224 gpioled_detach(device_t dev) 225 { 226 struct gpioled_softc *sc; 227 228 sc = device_get_softc(dev); 229 if (sc->sc_leddev) { 230 led_destroy(sc->sc_leddev); 231 sc->sc_leddev = NULL; 232 } 233 GPIOLED_LOCK_DESTROY(sc); 234 return (0); 235 } 236 237 static devclass_t gpioled_devclass; 238 239 static device_method_t gpioled_methods[] = { 240 /* Device interface */ 241 #ifdef FDT 242 DEVMETHOD(device_identify, gpioled_identify), 243 #endif 244 DEVMETHOD(device_probe, gpioled_probe), 245 DEVMETHOD(device_attach, gpioled_attach), 246 DEVMETHOD(device_detach, gpioled_detach), 247 248 DEVMETHOD_END 249 }; 250 251 static driver_t gpioled_driver = { 252 "gpioled", 253 gpioled_methods, 254 sizeof(struct gpioled_softc), 255 }; 256 257 DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0); 258 MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1); 259