Home | History | Annotate | Line # | Download | only in fdt 
      1 /* $NetBSD: gpioleds.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared McNeill <jmcneill (at) 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