2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/types.h>
31 #include <sys/ioctl.h>
33 #include <sys/capsicum.h>
34 #include <dev/pwm/pwmc.h>
44 #include <capsicum_helpers.h>
46 #define PWM_ENABLE 0x0001
47 #define PWM_DISABLE 0x0002
48 #define PWM_SHOW_CONFIG 0x0004
49 #define PWM_PERIOD 0x0008
50 #define PWM_DUTY 0x0010
51 #define PWM_INVERTED 0x0020
53 static char device_name[PATH_MAX] = "/dev/pwm/pwmc0.0";
56 set_device_name(const char *name)
60 strlcpy(device_name, name, sizeof(device_name));
62 snprintf(device_name, sizeof(device_name), "/dev/pwm/%s", name);
68 fprintf(stderr, "Usage:\n");
69 fprintf(stderr, "\tpwm [-f dev] -C\n");
70 fprintf(stderr, "\tpwm [-f dev] [-D | -E] [-I] [-p period] [-d duty[%%]]\n");
75 main(int argc, char *argv[])
77 struct pwm_state state;
81 cap_rights_t right_ioctl;
82 const unsigned long pwm_ioctls[] = {PWMGETSTATE, PWMSETSTATE};
91 while ((ch = getopt(argc, argv, "f:EDCIp:d:")) != -1) {
94 if (action & (PWM_DISABLE | PWM_SHOW_CONFIG))
99 if (action & (PWM_ENABLE | PWM_SHOW_CONFIG))
101 action |= PWM_DISABLE;
106 action = PWM_SHOW_CONFIG;
109 if (action & PWM_SHOW_CONFIG)
111 action |= PWM_INVERTED;
114 if (action & PWM_SHOW_CONFIG)
116 action |= PWM_PERIOD;
117 period = strtoul(optarg, NULL, 10);
120 if (action & PWM_SHOW_CONFIG)
123 duty = strtoul(optarg, &percent, 10);
124 if (*percent == '%') {
127 "Invalid duty percentage\n");
130 } else if (*percent != '\0')
135 set_device_name(optarg);
146 if ((fd = open(device_name, O_RDWR)) == -1) {
147 fprintf(stderr, "pwm: cannot open %s: %s\n",
148 device_name, strerror(errno));
155 if (caph_limit_stdio() < 0) {
156 fprintf(stderr, "can't limit stdio rights");
159 caph_cache_catpages();
160 cap_rights_init(&right_ioctl, CAP_IOCTL);
161 if (caph_rights_limit(fd, &right_ioctl) < 0) {
162 fprintf(stderr, "cap_right_limit() failed\n");
165 if (caph_ioctls_limit(fd, pwm_ioctls, nitems(pwm_ioctls)) < 0) {
166 fprintf(stderr, "caph_ioctls_limit() failed\n");
169 if (caph_enter() < 0) {
170 fprintf(stderr, "failed to enter capability mode\n");
174 /* Fill the common args */
175 if (ioctl(fd, PWMGETSTATE, &state) == -1) {
176 fprintf(stderr, "Cannot get current state of the pwm controller\n");
180 if (action == PWM_SHOW_CONFIG) {
181 printf("period: %u\nduty: %u\nenabled:%d\ninverted:%d\n",
185 state.flags & PWM_POLARITY_INVERTED);
187 if (action & PWM_ENABLE)
189 if (action & PWM_DISABLE)
190 state.enable = false;
191 if (action & PWM_PERIOD)
192 state.period = period;
193 if (action & PWM_INVERTED)
194 state.flags |= PWM_POLARITY_INVERTED;
196 state.flags &= ~PWM_POLARITY_INVERTED;
197 if (action & PWM_DUTY) {
198 if (*percent != '\0')
199 state.duty = (uint64_t)state.period * duty / 100;
204 if (ioctl(fd, PWMSETSTATE, &state) == -1) {
206 "Cannot configure the pwm controller\n");