fbd.c revision 271117 
1/*-
2 * Copyright (c) 2013 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Aleksandr Rybalko under sponsorship from the
6 * FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: stable/10/sys/dev/fb/fbd.c 271117 2014-09-04 18:43:40Z emaste $
30 */
31
32/* Generic framebuffer */
33/* TODO unlink from VT(9) */
34/* TODO done normal /dev/fb methods */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: stable/10/sys/dev/fb/fbd.c 271117 2014-09-04 18:43:40Z emaste $");
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/bus.h>
42#include <sys/conf.h>
43#include <sys/kernel.h>
44#include <sys/malloc.h>
45#include <sys/module.h>
46#include <sys/queue.h>
47#include <sys/fbio.h>
48
49#include <machine/bus.h>
50
51#include <dev/vt/vt.h>
52#include <dev/vt/hw/fb/vt_fb.h>
53
54#include "fb_if.h"
55
56LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
57    LIST_HEAD_INITIALIZER(fb_list_head);
58struct fb_list_entry {
59	struct fb_info	*fb_info;
60	struct cdev	*fb_si;
61	LIST_ENTRY(fb_list_entry) fb_list;
62};
63
64struct fbd_softc {
65	device_t	sc_dev;
66	struct fb_info	*sc_info;
67};
68
69static void fbd_evh_init(void *);
70/* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
71SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
72
73static d_open_t		fb_open;
74static d_close_t	fb_close;
75static d_read_t		fb_read;
76static d_write_t	fb_write;
77static d_ioctl_t	fb_ioctl;
78static d_mmap_t		fb_mmap;
79
80static struct cdevsw fb_cdevsw = {
81	.d_version =	D_VERSION,
82	.d_flags =	D_NEEDGIANT,
83	.d_open =	fb_open,
84	.d_close =	fb_close,
85	.d_read =	fb_read,
86	.d_write =	fb_write,
87	.d_ioctl =	fb_ioctl,
88	.d_mmap =	fb_mmap,
89	.d_name =	"fb",
90};
91
92static int framebuffer_dev_unit = 0;
93
94static int
95fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
96{
97
98	return (0);
99}
100
101static int
102fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
103{
104
105	return (0);
106}
107
108static int
109fb_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
110    struct thread *td)
111{
112	struct fb_info *info;
113	int error;
114
115	error = 0;
116	info = dev->si_drv1;
117
118	switch (cmd) {
119	case FBIOGTYPE:
120		bcopy(info, (struct fbtype *)data, sizeof(struct fbtype));
121		break;
122
123	case FBIO_GETWINORG:	/* get frame buffer window origin */
124		*(u_int *)data = 0;
125		break;
126
127	case FBIO_GETDISPSTART:	/* get display start address */
128		((video_display_start_t *)data)->x = 0;
129		((video_display_start_t *)data)->y = 0;
130		break;
131
132	case FBIO_GETLINEWIDTH:	/* get scan line width in bytes */
133		*(u_int *)data = info->fb_stride;
134		break;
135
136	case FBIO_BLANK:	/* blank display */
137		error = 0;	/* TODO */
138		break;
139
140	default:
141		error = ENOIOCTL;
142		break;
143	}
144	return (error);
145}
146
147static int
148fb_read(struct cdev *dev, struct uio *uio, int ioflag)
149{
150
151	return (0); /* XXX nothing to read, yet */
152}
153
154static int
155fb_write(struct cdev *dev, struct uio *uio, int ioflag)
156{
157
158	return (0); /* XXX nothing written */
159}
160
161static int
162fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
163    vm_memattr_t *memattr)
164{
165	struct fb_info *info;
166
167	info = dev->si_drv1;
168
169	if ((info->fb_flags & FB_FLAG_NOMMAP) || info->fb_pbase == 0)
170		return (ENODEV);
171
172	if (offset < info->fb_size) {
173		*paddr = info->fb_pbase + offset;
174		return (0);
175	}
176	return (EINVAL);
177}
178
179static int
180fb_init(struct fb_list_entry *entry, int unit)
181{
182	struct fb_info *info;
183
184	info = entry->fb_info;
185	entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
186	    0600, "fb%d", unit);
187	entry->fb_si->si_drv1 = info;
188	info->fb_cdev = entry->fb_si;
189
190	return (0);
191}
192
193int
194fbd_list()
195{
196	struct fb_list_entry *entry;
197
198	if (LIST_EMPTY(&fb_list_head))
199		return (ENOENT);
200
201	LIST_FOREACH(entry, &fb_list_head, fb_list) {
202		printf("FB %s @%p\n", entry->fb_info->fb_name,
203		    (void *)entry->fb_info->fb_pbase);
204	}
205
206	return (0);
207}
208
209static struct fb_list_entry *
210fbd_find(struct fb_info* info)
211{
212	struct fb_list_entry *entry, *tmp;
213
214	LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
215		if (entry->fb_info == info) {
216			return (entry);
217		}
218	}
219
220	return (NULL);
221}
222
223int
224fbd_register(struct fb_info* info)
225{
226	struct fb_list_entry *entry;
227	int err, first;
228
229	first = 0;
230	if (LIST_EMPTY(&fb_list_head))
231		first++;
232
233	entry = fbd_find(info);
234	if (entry != NULL) {
235		/* XXX Update framebuffer params */
236		return (0);
237	}
238
239	entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
240	entry->fb_info = info;
241
242	LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
243
244	err = fb_init(entry, framebuffer_dev_unit++);
245	if (err)
246		return (err);
247
248	if (first) {
249		if (vt_fb_attach(info) == CN_DEAD)
250			return (ENXIO);
251	}
252
253	return (0);
254}
255
256int
257fbd_unregister(struct fb_info* info)
258{
259	struct fb_list_entry *entry, *tmp;
260
261	LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
262		if (entry->fb_info == info) {
263			LIST_REMOVE(entry, fb_list);
264			free(entry, M_DEVBUF);
265			return (0);
266		}
267	}
268
269	return (ENOENT);
270}
271
272static void
273register_fb_wrap(void *arg, void *ptr)
274{
275
276	fbd_register((struct fb_info *)ptr);
277}
278
279static void
280unregister_fb_wrap(void *arg, void *ptr)
281{
282
283	fbd_unregister((struct fb_info *)ptr);
284}
285
286static void
287fbd_evh_init(void *ctx)
288{
289
290	EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
291	    EVENTHANDLER_PRI_ANY);
292	EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
293	    EVENTHANDLER_PRI_ANY);
294}
295
296/* Newbus methods. */
297static int
298fbd_probe(device_t dev)
299{
300
301	return (BUS_PROBE_NOWILDCARD);
302}
303
304static int
305fbd_attach(device_t dev)
306{
307	struct fbd_softc *sc;
308	int err;
309
310	sc = device_get_softc(dev);
311
312	sc->sc_dev = dev;
313	sc->sc_info = FB_GETINFO(device_get_parent(dev));
314	if (sc->sc_info == NULL)
315		return (ENXIO);
316	err = fbd_register(sc->sc_info);
317
318	return (err);
319}
320
321static int
322fbd_detach(device_t dev)
323{
324	struct fbd_softc *sc;
325	int err;
326
327	sc = device_get_softc(dev);
328
329	err = fbd_unregister(sc->sc_info);
330
331	return (err);
332}
333
334static int
335fbd_suspend(device_t dev)
336{
337
338	vt_fb_suspend();
339	return (bus_generic_suspend(dev));
340}
341
342static int
343fbd_resume(device_t dev)
344{
345
346	vt_fb_resume();
347	return (bus_generic_resume(dev));
348}
349
350static device_method_t fbd_methods[] = {
351	/* Device interface */
352	DEVMETHOD(device_probe,		fbd_probe),
353	DEVMETHOD(device_attach,	fbd_attach),
354	DEVMETHOD(device_detach,	fbd_detach),
355
356	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
357	DEVMETHOD(device_suspend,	fbd_suspend),
358	DEVMETHOD(device_resume,	fbd_resume),
359
360	{ 0, 0 }
361};
362
363driver_t fbd_driver = {
364	"fbd",
365	fbd_methods,
366	sizeof(struct fbd_softc)
367};
368
369devclass_t	fbd_devclass;
370
371DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
372DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
373MODULE_VERSION(fbd, 1);
374
375