fdt_regulator.c revision 1.1 
1/* $NetBSD: fdt_regulator.c,v 1.1 2015/12/16 12:03:44 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2015 Jared D. 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: fdt_regulator.c,v 1.1 2015/12/16 12:03:44 jmcneill Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/kmem.h>
35
36#include <libfdt.h>
37#include <dev/ofw/openfirm.h>
38#include <dev/fdt/fdt_openfirm.h>
39#include <dev/fdt/fdtvar.h>
40
41struct fdtbus_regulator_controller {
42	device_t rc_dev;
43	int rc_phandle;
44	const struct fdtbus_regulator_controller_func *rc_funcs;
45
46	struct fdtbus_regulator_controller *rc_next;
47};
48
49static struct fdtbus_regulator_controller *fdtbus_rc = NULL;
50
51int
52fdtbus_register_regulator_controller(device_t dev, int phandle,
53    const struct fdtbus_regulator_controller_func *funcs)
54{
55	struct fdtbus_regulator_controller *rc;
56
57	rc = kmem_alloc(sizeof(*rc), KM_SLEEP);
58	rc->rc_dev = dev;
59	rc->rc_phandle = phandle;
60	rc->rc_funcs = funcs;
61
62	rc->rc_next = fdtbus_rc;
63	fdtbus_rc = rc;
64
65	return 0;
66}
67
68static struct fdtbus_regulator_controller *
69fdtbus_get_regulator_controller(int phandle)
70{
71	struct fdtbus_regulator_controller *rc;
72
73	for (rc = fdtbus_rc; rc; rc = rc->rc_next) {
74		if (rc->rc_phandle == phandle) {
75			return rc;
76		}
77	}
78
79	return NULL;
80}
81
82struct fdtbus_regulator *
83fdtbus_regulator_acquire(int phandle, const char *prop)
84{
85	struct fdtbus_regulator_controller *rc;
86	struct fdtbus_regulator *reg;
87	int regulator_phandle;
88	int error;
89
90	regulator_phandle = fdtbus_get_phandle(phandle, prop);
91	if (regulator_phandle == -1) {
92		return NULL;
93	}
94
95	rc = fdtbus_get_regulator_controller(regulator_phandle);
96	if (rc == NULL) {
97		return NULL;
98	}
99
100	error = rc->rc_funcs->acquire(rc->rc_dev);
101	if (error) {
102		return NULL;
103	}
104
105	reg = kmem_alloc(sizeof(*reg), KM_SLEEP);
106	reg->reg_rc = rc;
107
108	return reg;
109}
110
111void
112fdtbus_regulator_release(struct fdtbus_regulator *reg)
113{
114	struct fdtbus_regulator_controller *rc = reg->reg_rc;
115
116	rc->rc_funcs->release(rc->rc_dev);
117
118	kmem_free(reg, sizeof(*reg));
119}
120
121int
122fdtbus_regulator_enable(struct fdtbus_regulator *reg)
123{
124	struct fdtbus_regulator_controller *rc = reg->reg_rc;
125
126	return rc->rc_funcs->enable(rc->rc_dev, true);
127}
128
129int
130fdtbus_regulator_disable(struct fdtbus_regulator *reg)
131{
132	struct fdtbus_regulator_controller *rc = reg->reg_rc;
133
134	return rc->rc_funcs->enable(rc->rc_dev, false);
135}
136