xref: /freebsd/sys/dev/fb/fbd.c (revision 4ce386ff25d77954b8cfa11534f632172e848244)
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  * $FreeBSD$
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("$FreeBSD$");
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 
56 LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
57     LIST_HEAD_INITIALIZER(fb_list_head);
58 struct fb_list_entry {
59 	struct fb_info	*fb_info;
60 	struct cdev	*fb_si;
61 	LIST_ENTRY(fb_list_entry) fb_list;
62 };
63 
64 struct fbd_softc {
65 	device_t	sc_dev;
66 	struct fb_info	*sc_info;
67 };
68 
69 static void fbd_evh_init(void *);
70 /* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
71 SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
72 
73 static d_open_t		fb_open;
74 static d_close_t	fb_close;
75 static d_read_t		fb_read;
76 static d_write_t	fb_write;
77 static d_ioctl_t	fb_ioctl;
78 static d_mmap_t		fb_mmap;
79 
80 static 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 
92 static int framebuffer_dev_unit = 0;
93 
94 static int
95 fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
96 {
97 
98 	return (0);
99 }
100 
101 static int
102 fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
103 {
104 
105 	return (0);
106 }
107 
108 static int
109 fb_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 
148 static int
149 fb_read(struct cdev *dev, struct uio *uio, int ioflag)
150 {
151 
152 	return (0); /* XXX nothing to read, yet */
153 }
154 
155 static int
156 fb_write(struct cdev *dev, struct uio *uio, int ioflag)
157 {
158 
159 	return (0); /* XXX nothing written */
160 }
161 
162 static int
163 fb_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 
180 static int
181 fb_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 
194 int
195 fbd_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 
210 static struct fb_list_entry *
211 fbd_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 
224 int
225 fbd_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 
258 int
259 fbd_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 
276 static void
277 register_fb_wrap(void *arg, void *ptr)
278 {
279 
280 	fbd_register((struct fb_info *)ptr);
281 }
282 
283 static void
284 unregister_fb_wrap(void *arg, void *ptr)
285 {
286 
287 	fbd_unregister((struct fb_info *)ptr);
288 }
289 
290 static void
291 fbd_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. */
301 static int
302 fbd_probe(device_t dev)
303 {
304 
305 	return (BUS_PROBE_NOWILDCARD);
306 }
307 
308 static int
309 fbd_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 
325 static int
326 fbd_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 
338 static 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 
349 driver_t fbd_driver = {
350 	"fbd",
351 	fbd_methods,
352 	sizeof(struct fbd_softc)
353 };
354 
355 devclass_t	fbd_devclass;
356 
357 DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
358 DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
359 MODULE_VERSION(fbd, 1);
360 
361