1 /* $NetBSD: gpioleds.c,v 1.2 2021/01/27 03:10:21 thorpej 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 1.2 2021/01/27 03:10:21 thorpej 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 const struct device_compatible_entry compat_data[] = { 66 { .compat = "gpio-leds" }, 67 DEVICE_COMPAT_EOL 68 }; 69 70 static int 71 gpioleds_match(device_t parent, cfdata_t cf, void *aux) 72 { 73 const struct fdt_attach_args *faa = aux; 74 75 return of_compatible_match(faa->faa_phandle, compat_data); 76 } 77 78 static void 79 gpioleds_attach(device_t parent, device_t self, void *aux) 80 { 81 const struct fdt_attach_args *faa = aux; 82 const int phandle = faa->faa_phandle; 83 struct fdtbus_gpio_pin *pin; 84 const char *default_state; 85 char label[64]; 86 int child; 87 88 aprint_naive("\n"); 89 aprint_normal(":"); 90 91 for (child = OF_child(phandle); child; child = OF_peer(child)) { 92 /* Get the label, fallback to node name */ 93 if (OF_getprop(child, "label", label, sizeof(label)) <= 0 && 94 OF_getprop(child, "name", label, sizeof(label)) <= 0) 95 continue; 96 97 /* Get the output pin */ 98 pin = fdtbus_gpio_acquire(child, "gpios", GPIO_PIN_OUTPUT); 99 if (pin == NULL) 100 continue; 101 102 /* Attach the LED */ 103 if (led_attach(label, pin, gpioleds_get, gpioleds_set) == NULL) 104 continue; 105 106 aprint_normal(" %s", label); 107 108 /* Set default state */ 109 default_state = fdtbus_get_string(child, "default-state"); 110 if (default_state && strcmp(default_state, "on") == 0) 111 gpioleds_set(pin, LED_STATE_ON); 112 else if (default_state && strcmp(default_state, "off") == 0) 113 gpioleds_set(pin, LED_STATE_OFF); 114 } 115 116 aprint_normal("\n"); 117 } 118