pccard_device.c revision 150362 
1/*-
2 * Copyright (c) 2005, M. Warner Losh
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 unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/dev/pccard/pccard_device.c 150362 2005-09-20 06:47:33Z imp $");
30
31#include <sys/param.h>
32#include <sys/conf.h>
33#include <sys/malloc.h>
34#include <sys/systm.h>
35#include <sys/uio.h>
36
37#include <sys/bus.h>
38#include <machine/bus.h>
39#include <sys/rman.h>
40#include <machine/resource.h>
41
42#include <dev/pccard/pccardreg.h>
43#include <dev/pccard/pccardvar.h>
44#include <dev/pccard/pccardvarp.h>
45#include <dev/pccard/pccard_cis.h>
46
47static	d_open_t	pccard_open;
48static	d_close_t	pccard_close;
49static	d_read_t	pccard_read;
50static	d_ioctl_t	pccard_ioctl;
51
52static struct cdevsw pccard_cdevsw = {
53	.d_version =	D_VERSION,
54	.d_open =	pccard_open,
55	.d_close =	pccard_close,
56	.d_read =	pccard_read,
57	.d_ioctl =	pccard_ioctl,
58	.d_name =	"pccard"
59};
60
61int
62pccard_device_create(struct pccard_softc *sc)
63{
64	sc->cisdev = make_dev(&pccard_cdevsw, 0, 0, 0, 0666, "pccard%u.cis",
65	    device_get_unit(sc->dev));
66	sc->cisdev->si_drv1 = sc;
67	return (0);
68}
69
70int
71pccard_device_destroy(struct pccard_softc *sc)
72{
73	destroy_dev(sc->cisdev);
74	return (0);
75}
76
77static int
78pccard_build_cis(const struct pccard_tuple *tuple, void *argp)
79{
80	struct cis_buffer *cis;
81	int i;
82	uint8_t ch;
83
84	cis = (struct cis_buffer *)argp;
85	/*
86	 * CISTPL_END is a special case, it has no length field.
87	 */
88	if (tuple->code == CISTPL_END) {
89		if (cis->len + 1 > sizeof(cis->buffer))
90			return (ENOSPC);
91		cis->buffer[cis->len++] = tuple->code;
92		return (0);
93	}
94	if (cis->len + 2 + tuple->code > sizeof(cis->buffer))
95		return (ENOSPC);
96	cis->buffer[cis->len++] = tuple->code;
97	cis->buffer[cis->len++] = tuple->length;
98	for (i = 0; i < tuple->length; i++) {
99		ch = pccard_tuple_read_1(tuple, i);
100		cis->buffer[cis->len++] = ch;
101	}
102	return (0);
103}
104
105static	int
106pccard_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
107{
108	device_t parent, child;
109	device_t *kids;
110	int cnt, err;
111	struct pccard_softc *sc;
112
113	sc = dev->si_drv1;
114	if (sc->cis_open)
115		return (EBUSY);
116	parent = sc->dev;
117	err = device_get_children(parent, &kids, &cnt);
118	if (err)
119		return err;
120	if (cnt == 0) {
121		free(kids, M_TEMP);
122		sc->cis_open++;
123		sc->cis = NULL;
124		return (0);
125	}
126	child = kids[0];
127	free(kids, M_TEMP);
128	sc->cis = malloc(sizeof(*sc->cis), M_TEMP, M_ZERO | M_WAITOK);
129	err = pccard_scan_cis(parent, child, pccard_build_cis, sc->cis);
130	if (err) {
131		free(sc->cis, M_TEMP);
132		sc->cis = NULL;
133		return (err);
134	}
135	sc->cis_open++;
136	return (0);
137}
138
139static	int
140pccard_close(struct cdev *dev, int fflags, int devtype, struct thread *td)
141{
142	struct pccard_softc *sc;
143
144	sc = dev->si_drv1;
145	free(sc->cis, M_TEMP);
146	sc->cis = NULL;
147	sc->cis_open = 0;
148	return (0);
149}
150
151static	int
152pccard_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
153    struct thread *td)
154{
155	return (ENOTTY);
156}
157
158static	int
159pccard_read(struct cdev *dev, struct uio *uio, int ioflag)
160{
161	struct pccard_softc *sc;
162
163	sc = dev->si_drv1;
164	/* EOF */
165	if (sc->cis == NULL || uio->uio_offset > sc->cis->len)
166		return (0);
167	return (uiomove(sc->cis->buffer + uio->uio_offset,
168	  MIN(uio->uio_resid, sc->cis->len - uio->uio_offset), uio));
169}
170