1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2022 Oxide Computer Company
14 */
15
16 /*
17 * Our goal is to create the /dev/dpio/%s links that need to exist for each
18 * dpio(7) related entry. The kgpio driver creates a minor node for each dpio of
19 * the form 'dpio:<name>' and uses the type DDI_NT_GPIO_DPIO. For exmaple, the
20 * name 'dpio:foobar' would cause us to create /dev/dpio/foobar.
21 */
22
23 #include <devfsadm.h>
24 #include <string.h>
25
26 static int
dpio_link(di_minor_t minor,di_node_t node)27 dpio_link(di_minor_t minor, di_node_t node)
28 {
29 const char *name, *colon;
30 char buf[PATH_MAX];
31
32 name = di_minor_name(minor);
33 if (name == NULL) {
34 return (DEVFSADM_CONTINUE);
35 }
36
37 colon = strchr(name, ':');
38 if (colon == NULL) {
39 return (DEVFSADM_CONTINUE);
40 }
41
42 if (snprintf(buf, sizeof (buf), "dpio/%s", colon + 1) < sizeof (buf)) {
43 (void) devfsadm_mklink(buf, node, minor, 0);
44 }
45
46 return (DEVFSADM_CONTINUE);
47 }
48
49 static devfsadm_create_t dpio_create_cbt[] = {
50 { "pseudo", DDI_NT_GPIO_DPIO, "kgpio", TYPE_EXACT | DRV_EXACT, ILEVEL_0,
51 dpio_link }
52 };
53
54 static devfsadm_remove_t dpio_remove_cbt[] = {
55 { "pseudo", "^dpio/[A-Za-z0-9]+$", RM_POST | RM_HOT | RM_ALWAYS,
56 ILEVEL_0, devfsadm_rm_all },
57 };
58
59 DEVFSADM_CREATE_INIT_V0(dpio_create_cbt);
60 DEVFSADM_REMOVE_INIT_V0(dpio_remove_cbt);
61