fdt_pinctrl.c revision 1.1 
1/* $NetBSD: fdt_pinctrl.c,v 1.1 2015/12/30 04:23:39 marty Exp $ */
2
3/*-
4 * Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * 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
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: fdt_pinctrl.c,v 1.1 2015/12/30 04:23:39 marty Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/kmem.h>
35
36#include <libfdt.h>
37#include <dev/fdt/fdtvar.h>
38
39struct fdtbus_pinctrl_controller {
40	device_t pc_dev;
41	int pc_phandle;
42	const struct fdtbus_pinctrl_controller_func *pc_funcs;
43
44	struct fdtbus_pinctrl_controller *pc_next;
45};
46
47static struct fdtbus_pinctrl_controller *fdtbus_pc = NULL;
48
49int
50fdtbus_register_pinctrl_controller(device_t dev, int phandle,
51    const struct fdtbus_pinctrl_controller_func *funcs)
52{
53	struct fdtbus_pinctrl_controller *pc;
54
55	pc = kmem_alloc(sizeof(*pc), KM_SLEEP);
56	pc->pc_dev = dev;
57	pc->pc_phandle = phandle;
58	pc->pc_funcs = funcs;
59
60	pc->pc_next = fdtbus_pc;
61	fdtbus_pc = pc;
62
63	return 0;
64}
65
66struct fdtbus_pinctrl_pin *
67fdtbus_pinctrl_acquire(int phandle, const char *prop)
68{
69	struct fdtbus_pinctrl_controller *pc;
70	struct fdtbus_pinctrl_pin *gp;
71
72	gp = kmem_alloc(sizeof(*gp), KM_SLEEP);
73	for (pc = fdtbus_pc; pc; pc = pc->pc_next) {
74		gp->pp_pc = pc;
75		gp->pp_priv = pc->pc_funcs->acquire(pc->pc_dev, prop);
76		if (gp->pp_priv != NULL)
77			break;
78	}
79
80	if (gp->pp_priv == NULL) {
81		kmem_free(gp, sizeof(*gp));
82		return NULL;
83	}
84
85	return gp;
86}
87
88void
89fdtbus_pinctrl_release(struct fdtbus_pinctrl_pin *gp)
90{
91	struct fdtbus_pinctrl_controller *pc = gp->pp_pc;
92
93	pc->pc_funcs->release(pc->pc_dev, gp->pp_priv);
94	kmem_free(gp, sizeof(*gp));
95}
96
97void
98fdtbus_pinctrl_get_cfg(struct fdtbus_pinctrl_pin *gp, void *cookie)
99{
100	struct fdtbus_pinctrl_controller *pc = gp->pp_pc;
101
102	pc->pc_funcs->get(gp, cookie);
103}
104
105void
106fdtbus_pinctrl_set_cfg(struct fdtbus_pinctrl_pin *gp, void *cookie)
107{
108	struct fdtbus_pinctrl_controller *pc = gp->pp_pc;
109
110	pc->pc_funcs->set(gp, cookie);
111}
112