devctl.c revision 295131 
1/*-
2 * Copyright (c) 2014 John Baldwin <jhb@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/lib/libdevctl/devctl.c 295131 2016-02-01 23:07:31Z jhb $");
29
30#include <sys/types.h>
31#include <sys/bus.h>
32#include <errno.h>
33#include <fcntl.h>
34#include <string.h>
35#include "devctl.h"
36
37static int
38devctl_request(u_long cmd, struct devreq *req)
39{
40	static int devctl2_fd = -1;
41
42	if (devctl2_fd == -1) {
43		devctl2_fd = open("/dev/devctl2", O_RDONLY);
44		if (devctl2_fd == -1)
45			return (-1);
46	}
47	return (ioctl(devctl2_fd, cmd, req));
48}
49
50static int
51devctl_simple_request(u_long cmd, const char *name, int flags)
52{
53	struct devreq req;
54
55	memset(&req, 0, sizeof(req));
56	if (strlcpy(req.dr_name, name, sizeof(req.dr_name)) >=
57	    sizeof(req.dr_name)) {
58		errno = EINVAL;
59		return (-1);
60	}
61	req.dr_flags = flags;
62	return (devctl_request(cmd, &req));
63}
64
65int
66devctl_attach(const char *device)
67{
68
69	return (devctl_simple_request(DEV_ATTACH, device, 0));
70}
71
72int
73devctl_detach(const char *device, bool force)
74{
75
76	return (devctl_simple_request(DEV_DETACH, device, force ?
77	    DEVF_FORCE_DETACH : 0));
78}
79
80int
81devctl_enable(const char *device)
82{
83
84	return (devctl_simple_request(DEV_ENABLE, device, 0));
85}
86
87int
88devctl_disable(const char *device, bool force_detach)
89{
90
91	return (devctl_simple_request(DEV_DISABLE, device, force_detach ?
92	    DEVF_FORCE_DETACH : 0));
93}
94
95int
96devctl_set_driver(const char *device, const char *driver, bool force)
97{
98	struct devreq req;
99
100	memset(&req, 0, sizeof(req));
101	if (strlcpy(req.dr_name, device, sizeof(req.dr_name)) >=
102	    sizeof(req.dr_name)) {
103		errno = EINVAL;
104		return (-1);
105	}
106	req.dr_data = __DECONST(char *, driver);
107	if (force)
108		req.dr_flags |= DEVF_SET_DRIVER_DETACH;
109	return (devctl_request(DEV_SET_DRIVER, &req));
110}
111