2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, 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
31 #include <sys/types.h>
32 #include <sys/ioctl.h>
34 #include <sys/capsicum.h>
35 #include <dev/pwm/pwmc.h>
45 #include <capsicum_helpers.h>
47 #define PWM_ENABLE 0x0001
48 #define PWM_DISABLE 0x0002
49 #define PWM_SHOW_CONFIG 0x0004
50 #define PWM_PERIOD 0x0008
51 #define PWM_DUTY 0x0010
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] [-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:EDCp: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_PERIOD;
112 period = strtoul(optarg, NULL, 10);
115 if (action & PWM_SHOW_CONFIG)
118 duty = strtoul(optarg, &percent, 10);
119 if (*percent == '%') {
122 "Invalid duty percentage\n");
125 } else if (*percent != '\0')
130 set_device_name(optarg);
141 if ((fd = open(device_name, O_RDWR)) == -1) {
142 fprintf(stderr, "pwm: cannot open %s: %s\n",
143 device_name, strerror(errno));
150 if (caph_limit_stdio() < 0) {
151 fprintf(stderr, "can't limit stdio rights");
154 caph_cache_catpages();
155 cap_rights_init(&right_ioctl, CAP_IOCTL);
156 if (caph_rights_limit(fd, &right_ioctl) < 0) {
157 fprintf(stderr, "cap_right_limit() failed\n");
160 if (caph_ioctls_limit(fd, pwm_ioctls, nitems(pwm_ioctls)) < 0) {
161 fprintf(stderr, "caph_ioctls_limit() failed\n");
164 if (caph_enter() < 0) {
165 fprintf(stderr, "failed to enter capability mode\n");
169 /* Fill the common args */
170 if (ioctl(fd, PWMGETSTATE, &state) == -1) {
171 fprintf(stderr, "Cannot get current state of the pwm controller\n");
175 if (action == PWM_SHOW_CONFIG) {
176 printf("period: %u\nduty: %u\nenabled:%d\n",
181 if (action & PWM_ENABLE)
183 if (action & PWM_DISABLE)
184 state.enable = false;
185 if (action & PWM_PERIOD)
186 state.period = period;
187 if (action & PWM_DUTY) {
188 if (*percent != '\0')
189 state.duty = (uint64_t)state.period * duty / 100;
194 if (ioctl(fd, PWMSETSTATE, &state) == -1) {
196 "Cannot configure the pwm controller\n");