fdt_regulator.c revision 1.6 
1/* $NetBSD: fdt_regulator.c,v 1.6 2018/06/30 20:34:43 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 1.6 2018/06/30 20:34:43 jmcneill Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/kmem.h>
35#include <sys/queue.h>
36
37#include <libfdt.h>
38#include <dev/fdt/fdtvar.h>
39
40struct fdtbus_regulator_controller {
41	device_t rc_dev;
42	int rc_phandle;
43	const struct fdtbus_regulator_controller_func *rc_funcs;
44
45	LIST_ENTRY(fdtbus_regulator_controller) rc_next;
46};
47
48static LIST_HEAD(, fdtbus_regulator_controller) fdtbus_regulator_controllers =
49    LIST_HEAD_INITIALIZER(fdtbus_regulator_controllers);
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	LIST_INSERT_HEAD(&fdtbus_regulator_controllers, rc, rc_next);
63
64	return 0;
65}
66
67static struct fdtbus_regulator_controller *
68fdtbus_get_regulator_controller(int phandle)
69{
70	struct fdtbus_regulator_controller *rc;
71
72	LIST_FOREACH(rc, &fdtbus_regulator_controllers, rc_next) {
73		if (rc->rc_phandle == phandle)
74			return rc;
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		aprint_error_dev(rc->rc_dev, "failed to acquire regulator: %d\n", error);
101		return NULL;
102	}
103
104	reg = kmem_alloc(sizeof(*reg), KM_SLEEP);
105	reg->reg_rc = rc;
106
107	return reg;
108}
109
110void
111fdtbus_regulator_release(struct fdtbus_regulator *reg)
112{
113	struct fdtbus_regulator_controller *rc = reg->reg_rc;
114
115	rc->rc_funcs->release(rc->rc_dev);
116
117	kmem_free(reg, sizeof(*reg));
118}
119
120int
121fdtbus_regulator_enable(struct fdtbus_regulator *reg)
122{
123	struct fdtbus_regulator_controller *rc = reg->reg_rc;
124
125	return rc->rc_funcs->enable(rc->rc_dev, true);
126}
127
128int
129fdtbus_regulator_disable(struct fdtbus_regulator *reg)
130{
131	struct fdtbus_regulator_controller *rc = reg->reg_rc;
132
133	return rc->rc_funcs->enable(rc->rc_dev, false);
134}
135
136int
137fdtbus_regulator_set_voltage(struct fdtbus_regulator *reg, u_int min_uvol,
138    u_int max_uvol)
139{
140	struct fdtbus_regulator_controller *rc = reg->reg_rc;
141
142	if (rc->rc_funcs->set_voltage == NULL)
143		return EINVAL;
144
145	return rc->rc_funcs->set_voltage(rc->rc_dev, min_uvol, max_uvol);
146}
147
148int
149fdtbus_regulator_get_voltage(struct fdtbus_regulator *reg, u_int *puvol)
150{
151	struct fdtbus_regulator_controller *rc = reg->reg_rc;
152
153	if (rc->rc_funcs->get_voltage == NULL)
154		return EINVAL;
155
156	return rc->rc_funcs->get_voltage(rc->rc_dev, puvol);
157}
158