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91daddcb7c
Since Linux kernel 6.0, PPPS capable USB hubs expose a simple sysfs attribute for power control. Allow overwriting the usb control callback to use PPPS hub control instead. Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/*
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* Copyright (c) 2023, Linaro Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define _GNU_SOURCE /* for asprintf */
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include "device.h"
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#define PPPS_BASE_PATH "/sys/bus/usb/devices"
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#define PPPS_BASE_PATH_LEN strlen(PPPS_BASE_PATH)
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void ppps_power(struct device *dev, bool on)
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{
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static char *path = NULL;
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int rc, fd;
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/* Only need to figure out the whole string once */
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if (!path) {
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/* ppps_path should be like "2-2:1.0/2-2-port2" */
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asprintf(&path, "%s/%s/disable", PPPS_BASE_PATH, dev->ppps_path);
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}
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// fprintf(stderr, "ppps_power: %-3s %s\n", on ? "on" : "off", path);
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fd = open(path, O_WRONLY);
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if (fd < 0) {
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fprintf(stderr, "failed to open %s: %s\n", path, strerror(errno));
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if (errno != ENOENT)
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fprintf(stderr, "Maybe missing permissions (see https://git.io/JIB2Z)\n");
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return;
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}
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rc = write(fd, on ? "0" : "1", 1);
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if (rc < 0)
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fprintf(stderr, "failed to write to %s: %s\n", path, strerror(errno));
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close(fd);
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}
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