1 /* $NetBSD: gpioleds.c,v 1.1 2017/07/08 00:55:02 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: gpioleds.c,v 1.1 2017/07/08 00:55:02 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/systm.h> 35 #include <sys/device.h> 36 #include <sys/kmem.h> 37 #include <sys/bus.h> 38 #include <sys/gpio.h> 39 40 #include <dev/led.h> 41 42 #include <dev/fdt/fdtvar.h> 43 44 static int gpioleds_match(device_t, cfdata_t, void *); 45 static void gpioleds_attach(device_t, device_t, void *); 46 47 CFATTACH_DECL_NEW(gpioleds, 0, gpioleds_match, gpioleds_attach, NULL, NULL); 48 49 static int 50 gpioleds_get(void *priv) 51 { 52 struct fdtbus_gpio_pin *pin = priv; 53 54 return fdtbus_gpio_read(pin); 55 } 56 57 static void 58 gpioleds_set(void *priv, int state) 59 { 60 struct fdtbus_gpio_pin *pin = priv; 61 62 fdtbus_gpio_write(pin, state); 63 } 64 65 static int 66 gpioleds_match(device_t parent, cfdata_t cf, void *aux) 67 { 68 const char * const compatible[] = { "gpio-leds", NULL }; 69 const struct fdt_attach_args *faa = aux; 70 71 return of_match_compatible(faa->faa_phandle, compatible); 72 } 73 74 static void 75 gpioleds_attach(device_t parent, device_t self, void *aux) 76 { 77 const struct fdt_attach_args *faa = aux; 78 const int phandle = faa->faa_phandle; 79 struct fdtbus_gpio_pin *pin; 80 const char *default_state; 81 char label[64]; 82 int child; 83 84 aprint_naive("\n"); 85 aprint_normal(":"); 86 87 for (child = OF_child(phandle); child; child = OF_peer(child)) { 88 /* Get the label, fallback to node name */ 89 if (OF_getprop(child, "label", label, sizeof(label)) <= 0 && 90 OF_getprop(child, "name", label, sizeof(label)) <= 0) 91 continue; 92 93 /* Get the output pin */ 94 pin = fdtbus_gpio_acquire(child, "gpios", GPIO_PIN_OUTPUT); 95 if (pin == NULL) 96 continue; 97 98 /* Attach the LED */ 99 if (led_attach(label, pin, gpioleds_get, gpioleds_set) == NULL) 100 continue; 101 102 aprint_normal(" %s", label); 103 104 /* Set default state */ 105 default_state = fdtbus_get_string(child, "default-state"); 106 if (default_state && strcmp(default_state, "on") == 0) 107 gpioleds_set(pin, LED_STATE_ON); 108 else if (default_state && strcmp(default_state, "off") == 0) 109 gpioleds_set(pin, LED_STATE_OFF); 110 } 111 112 aprint_normal("\n"); 113 } 114