1 /* $NetBSD: pwm.c,v 1.1 2018/05/06 10:32:33 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2018 Jared 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: pwm.c,v 1.1 2018/05/06 10:32:33 jmcneill Exp $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/device.h>
35
36 #include <dev/pwm/pwmvar.h>
37
38 int
pwm_enable(pwm_tag_t pwm)39 pwm_enable(pwm_tag_t pwm)
40 {
41 return pwm->pwm_enable(pwm, true);
42 }
43
44 int
pwm_disable(pwm_tag_t pwm)45 pwm_disable(pwm_tag_t pwm)
46 {
47 return pwm->pwm_enable(pwm, false);
48 }
49
50 int
pwm_get_config(pwm_tag_t pwm,struct pwm_config * conf)51 pwm_get_config(pwm_tag_t pwm, struct pwm_config *conf)
52 {
53 return pwm->pwm_get_config(pwm, conf);
54 }
55
56 int
pwm_set_config(pwm_tag_t pwm,const struct pwm_config * conf)57 pwm_set_config(pwm_tag_t pwm, const struct pwm_config *conf)
58 {
59 if (conf->period < conf->duty_cycle)
60 return EINVAL;
61
62 return pwm->pwm_set_config(pwm, conf);
63 }
64