ofw_regulator.c revision 1.1 
1/*	$OpenBSD: ofw_regulator.c,v 1.1 2016/08/13 10:52:21 kettenis Exp $	*/
2/*
3 * Copyright (c) 2016 Mark Kettenis
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <sys/types.h>
19#include <sys/systm.h>
20#include <sys/malloc.h>
21
22#include <dev/ofw/openfirm.h>
23#include <dev/ofw/ofw_gpio.h>
24#include <dev/ofw/ofw_pinctrl.h>
25#include <dev/ofw/ofw_regulator.h>
26
27int
28regulator_set(uint32_t phandle, int enable)
29{
30	uint32_t *gpio;
31	uint32_t startup_delay;
32	int active;
33	int node;
34	int len;
35
36	node = OF_getnodebyphandle(phandle);
37	if (node == 0)
38		return -1;
39
40	if (!OF_is_compatible(node, "regulator-fixed"))
41		return -1;
42
43	pinctrl_byname(node, "default");
44
45	if (OF_getproplen(node, "enable-active-high") == 0)
46		active = 1;
47	else
48		active = 0;
49
50	/* The "gpio" property is optional. */
51	len = OF_getproplen(node, "gpio");
52	if (len < 0)
53		return 0;
54
55	gpio = malloc(len, M_TEMP, M_WAITOK);
56	OF_getpropintarray(node, "gpio", gpio, len);
57	gpio_controller_config_pin(gpio, GPIO_CONFIG_OUTPUT);
58	if (enable)
59		gpio_controller_set_pin(gpio, active);
60	else
61		gpio_controller_set_pin(gpio, !active);
62	free(gpio, M_TEMP, len);
63
64	startup_delay = OF_getpropint(node, "startup-delay-us", 0);
65	if (enable && startup_delay > 0)
66		delay(startup_delay);
67
68	return 0;
69}
70
71int
72regulator_enable(uint32_t phandle)
73{
74	return regulator_set(phandle, 1);
75}
76
77int
78regulator_disable(uint32_t phandle)
79{
80	return regulator_set(phandle, 0);
81}
82