fdt_regulator.c revision 1.2 
1/* $NetBSD: fdt_regulator.c,v 1.2 2015/12/16 12:17:45 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 1.2 2015/12/16 12:17:45 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/fdt/fdtvar.h>
38
39struct fdtbus_regulator_controller {
40	device_t rc_dev;
41	int rc_phandle;
42	const struct fdtbus_regulator_controller_func *rc_funcs;
43
44	struct fdtbus_regulator_controller *rc_next;
45};
46
47static struct fdtbus_regulator_controller *fdtbus_rc = NULL;
48
49int
50fdtbus_register_regulator_controller(device_t dev, int phandle,
51    const struct fdtbus_regulator_controller_func *funcs)
52{
53	struct fdtbus_regulator_controller *rc;
54
55	rc = kmem_alloc(sizeof(*rc), KM_SLEEP);
56	rc->rc_dev = dev;
57	rc->rc_phandle = phandle;
58	rc->rc_funcs = funcs;
59
60	rc->rc_next = fdtbus_rc;
61	fdtbus_rc = rc;
62
63	return 0;
64}
65
66static struct fdtbus_regulator_controller *
67fdtbus_get_regulator_controller(int phandle)
68{
69	struct fdtbus_regulator_controller *rc;
70
71	for (rc = fdtbus_rc; rc; rc = rc->rc_next) {
72		if (rc->rc_phandle == phandle) {
73			return rc;
74		}
75	}
76
77	return NULL;
78}
79
80struct fdtbus_regulator *
81fdtbus_regulator_acquire(int phandle, const char *prop)
82{
83	struct fdtbus_regulator_controller *rc;
84	struct fdtbus_regulator *reg;
85	int regulator_phandle;
86	int error;
87
88	regulator_phandle = fdtbus_get_phandle(phandle, prop);
89	if (regulator_phandle == -1) {
90		return NULL;
91	}
92
93	rc = fdtbus_get_regulator_controller(regulator_phandle);
94	if (rc == NULL) {
95		return NULL;
96	}
97
98	error = rc->rc_funcs->acquire(rc->rc_dev);
99	if (error) {
100		return NULL;
101	}
102
103	reg = kmem_alloc(sizeof(*reg), KM_SLEEP);
104	reg->reg_rc = rc;
105
106	return reg;
107}
108
109void
110fdtbus_regulator_release(struct fdtbus_regulator *reg)
111{
112	struct fdtbus_regulator_controller *rc = reg->reg_rc;
113
114	rc->rc_funcs->release(rc->rc_dev);
115
116	kmem_free(reg, sizeof(*reg));
117}
118
119int
120fdtbus_regulator_enable(struct fdtbus_regulator *reg)
121{
122	struct fdtbus_regulator_controller *rc = reg->reg_rc;
123
124	return rc->rc_funcs->enable(rc->rc_dev, true);
125}
126
127int
128fdtbus_regulator_disable(struct fdtbus_regulator *reg)
129{
130	struct fdtbus_regulator_controller *rc = reg->reg_rc;
131
132	return rc->rc_funcs->enable(rc->rc_dev, false);
133}
134