fbd.c revision 279488 
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: head/sys/dev/fb/fbd.c 279488 2015-03-01 12:54:22Z dumbbell $
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: head/sys/dev/fb/fbd.c 279488 2015-03-01 12:54:22Z dumbbell $");
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		if (info->setblankmode != NULL)
138			error = info->setblankmode(info->fb_priv, *(int *)data);
139		break;
140
141	default:
142		error = ENOIOCTL;
143		break;
144	}
145	return (error);
146}
147
148static int
149fb_read(struct cdev *dev, struct uio *uio, int ioflag)
150{
151
152	return (0); /* XXX nothing to read, yet */
153}
154
155static int
156fb_write(struct cdev *dev, struct uio *uio, int ioflag)
157{
158
159	return (0); /* XXX nothing written */
160}
161
162static int
163fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
164    vm_memattr_t *memattr)
165{
166	struct fb_info *info;
167
168	info = dev->si_drv1;
169
170	if ((info->fb_flags & FB_FLAG_NOMMAP) || info->fb_pbase == 0)
171		return (ENODEV);
172
173	if (offset < info->fb_size) {
174		*paddr = info->fb_pbase + offset;
175		return (0);
176	}
177	return (EINVAL);
178}
179
180static int
181fb_init(struct fb_list_entry *entry, int unit)
182{
183	struct fb_info *info;
184
185	info = entry->fb_info;
186	entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
187	    0600, "fb%d", unit);
188	entry->fb_si->si_drv1 = info;
189	info->fb_cdev = entry->fb_si;
190
191	return (0);
192}
193
194int
195fbd_list()
196{
197	struct fb_list_entry *entry;
198
199	if (LIST_EMPTY(&fb_list_head))
200		return (ENOENT);
201
202	LIST_FOREACH(entry, &fb_list_head, fb_list) {
203		printf("FB %s @%p\n", entry->fb_info->fb_name,
204		    (void *)entry->fb_info->fb_pbase);
205	}
206
207	return (0);
208}
209
210static struct fb_list_entry *
211fbd_find(struct fb_info* info)
212{
213	struct fb_list_entry *entry, *tmp;
214
215	LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
216		if (entry->fb_info == info) {
217			return (entry);
218		}
219	}
220
221	return (NULL);
222}
223
224int
225fbd_register(struct fb_info* info)
226{
227	struct fb_list_entry *entry;
228	int err, first;
229
230	first = 0;
231	if (LIST_EMPTY(&fb_list_head))
232		first++;
233
234	entry = fbd_find(info);
235	if (entry != NULL) {
236		/* XXX Update framebuffer params */
237		return (0);
238	}
239
240	entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
241	entry->fb_info = info;
242
243	LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
244
245	err = fb_init(entry, framebuffer_dev_unit++);
246	if (err)
247		return (err);
248
249	if (first) {
250		err = vt_fb_attach(info);
251		if (err)
252			return (err);
253	}
254
255	return (0);
256}
257
258int
259fbd_unregister(struct fb_info* info)
260{
261	struct fb_list_entry *entry, *tmp;
262
263	LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
264		if (entry->fb_info == info) {
265			LIST_REMOVE(entry, fb_list);
266			if (LIST_EMPTY(&fb_list_head))
267				vt_fb_detach(info);
268			free(entry, M_DEVBUF);
269			return (0);
270		}
271	}
272
273	return (ENOENT);
274}
275
276static void
277register_fb_wrap(void *arg, void *ptr)
278{
279
280	fbd_register((struct fb_info *)ptr);
281}
282
283static void
284unregister_fb_wrap(void *arg, void *ptr)
285{
286
287	fbd_unregister((struct fb_info *)ptr);
288}
289
290static void
291fbd_evh_init(void *ctx)
292{
293
294	EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
295	    EVENTHANDLER_PRI_ANY);
296	EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
297	    EVENTHANDLER_PRI_ANY);
298}
299
300/* Newbus methods. */
301static int
302fbd_probe(device_t dev)
303{
304
305	return (BUS_PROBE_NOWILDCARD);
306}
307
308static int
309fbd_attach(device_t dev)
310{
311	struct fbd_softc *sc;
312	int err;
313
314	sc = device_get_softc(dev);
315
316	sc->sc_dev = dev;
317	sc->sc_info = FB_GETINFO(device_get_parent(dev));
318	if (sc->sc_info == NULL)
319		return (ENXIO);
320	err = fbd_register(sc->sc_info);
321
322	return (err);
323}
324
325static int
326fbd_detach(device_t dev)
327{
328	struct fbd_softc *sc;
329	int err;
330
331	sc = device_get_softc(dev);
332
333	err = fbd_unregister(sc->sc_info);
334
335	return (err);
336}
337
338static device_method_t fbd_methods[] = {
339	/* Device interface */
340	DEVMETHOD(device_probe,		fbd_probe),
341	DEVMETHOD(device_attach,	fbd_attach),
342	DEVMETHOD(device_detach,	fbd_detach),
343
344	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
345
346	{ 0, 0 }
347};
348
349driver_t fbd_driver = {
350	"fbd",
351	fbd_methods,
352	sizeof(struct fbd_softc)
353};
354
355devclass_t	fbd_devclass;
356
357DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
358DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
359MODULE_VERSION(fbd, 1);
360
361