[sdl_omap.git] / src / video / omapdss / linux / fbdev.c

/*
 * (C) Gražvydas "notaz" Ignotas, 2009-2010
 *
 * This work is licensed under the terms of any of these licenses
 * (at your option):
 *  - GNU GPL, version 2 or later.
 *  - GNU LGPL, version 2.1 or later.
 * See the COPYING file in the top-level directory.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <linux/fb.h>
#include <linux/matroxfb.h>

#include "fbdev.h"

#define PFX "fbdev: "

#ifndef OMAPFB_WAITFORVSYNC_FRAME
#define OMAPFB_WAITFORVSYNC_FRAME _IOWR('O', 70, int)
#endif

struct vout_fbdev {
	int	fd;
	void	*mem;
	size_t	mem_size;
	struct	fb_var_screeninfo fbvar_old;
	struct	fb_var_screeninfo fbvar_new;
	int	buffer_write;
	int	fb_size;
	int	buffer_count;
	int	top_border, bottom_border;
	void	*mem_saved;
	size_t	mem_saved_size;
	unsigned long vsync_ioctl;
	int	vsync_arg;
};

void *vout_fbdev_flip(struct vout_fbdev *fbdev)
{
	int draw_buf;

	if (fbdev->buffer_count < 2)
		return fbdev->mem;

	draw_buf = fbdev->buffer_write;
	fbdev->buffer_write++;
	if (fbdev->buffer_write >= fbdev->buffer_count)
		fbdev->buffer_write = 0;

	fbdev->fbvar_new.yoffset = 
		(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
		fbdev->top_border;

	ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);

	return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
}

void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
{
	if (fbdev->vsync_ioctl != 0)
		ioctl(fbdev->fd, fbdev->vsync_ioctl, &fbdev->vsync_arg);
}

/* it is recommended to call vout_fbdev_clear() before this */
void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
		      int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
{
	int w_total = left_border + w + right_border;
	int h_total = top_border + h + bottom_border;
	size_t mem_size;
	int ret;

	// unblank to be sure the mode is really accepted
	ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);

	if (fbdev->fbvar_new.bits_per_pixel != bpp ||
			fbdev->fbvar_new.xres != w ||
			fbdev->fbvar_new.yres != h ||
			fbdev->fbvar_new.xres_virtual != w_total||
			fbdev->fbvar_new.yres_virtual < h_total ||
			fbdev->fbvar_new.xoffset != left_border ||
			fbdev->buffer_count != buffer_cnt)
	{
		if (fbdev->fbvar_new.bits_per_pixel != bpp ||
				w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
			printf(PFX "switching to %dx%d@%d\n", w, h, bpp);

		fbdev->fbvar_new.xres = w;
		fbdev->fbvar_new.yres = h;
		fbdev->fbvar_new.xres_virtual = w_total;
		fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
		fbdev->fbvar_new.xoffset = left_border;
		fbdev->fbvar_new.yoffset = top_border;
		fbdev->fbvar_new.bits_per_pixel = bpp;
		fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
		fbdev->buffer_count = buffer_cnt;
		fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0;

		// seems to help a bit to avoid glitches
		vout_fbdev_wait_vsync(fbdev);

		ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
		if (ret == -1) {
			// retry with no multibuffering
			fbdev->fbvar_new.yres_virtual = h_total;
			ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
			if (ret == -1) {
				perror(PFX "FBIOPUT_VSCREENINFO ioctl");
				return NULL;
			}
			fbdev->buffer_count = 1;
			fbdev->buffer_write = 0;
			fprintf(stderr, PFX "Warning: failed to increase virtual resolution, "
					"multibuffering disabled\n");
		}

	}

	fbdev->fb_size = w_total * h_total * bpp / 8;
	fbdev->top_border = top_border;
	fbdev->bottom_border = bottom_border;

	mem_size = fbdev->fb_size * fbdev->buffer_count;
	if (fbdev->mem_size >= mem_size)
		goto out;

	if (fbdev->mem != NULL)
		munmap(fbdev->mem, fbdev->mem_size);

	fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
		fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
		fbdev->buffer_count = 1;
		fbdev->buffer_write = 0;
		mem_size = fbdev->fb_size;
		fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	}
	if (fbdev->mem == MAP_FAILED) {
		fbdev->mem = NULL;
		fbdev->mem_size = 0;
		perror(PFX "mmap framebuffer");
		return NULL;
	}

	fbdev->mem_size = mem_size;

out:
	return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
}

void vout_fbdev_clear(struct vout_fbdev *fbdev)
{
	memset(fbdev->mem, 0, fbdev->mem_size);
}

void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
{
	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
	int i;

	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
		count = fbdev->top_border + fbdev->fbvar_new.yres - y;

	if (y >= 0 && count > 0)
		for (i = 0; i < fbdev->buffer_count; i++)
			memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
}

int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
{
	return fbdev->fd;
}

void *vout_fbdev_get_active_mem(struct vout_fbdev *fbdev)
{
	int i;

	i = fbdev->buffer_write - 1;
	if (i < 0)
		i = fbdev->buffer_count - 1;

	return (char *)fbdev->mem + fbdev->fb_size * i;
}

struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
{
	struct vout_fbdev *fbdev;
	int req_w, req_h;
	void *pret;
	int ret;

	fbdev = calloc(1, sizeof(*fbdev));
	if (fbdev == NULL)
		return NULL;

	fbdev->fd = open(fbdev_name, O_RDWR);
	if (fbdev->fd == -1) {
		fprintf(stderr, PFX "%s: ", fbdev_name);
		perror("open");
		goto fail_open;
	}

	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
	if (ret == -1) {
		perror(PFX "FBIOGET_VSCREENINFO ioctl");
		goto fail;
	}

	fbdev->fbvar_new = fbdev->fbvar_old;

	req_w = fbdev->fbvar_new.xres;
	if (*w != 0)
		req_w = *w;
	req_h = fbdev->fbvar_new.yres;
	if (*h != 0)
		req_h = *h;

	pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
	if (pret == NULL)
		goto fail;

	printf(PFX "%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres,
		fbdev->fbvar_new.yres, fbdev->fbvar_new.bits_per_pixel);
	*w = fbdev->fbvar_new.xres;
	*h = fbdev->fbvar_new.yres;

	memset(fbdev->mem, 0, fbdev->mem_size);

	// some checks
	// screen was unblanked by vout_fbdev_resize(), so vsync should work
	// first try pandora's adaptive vsync hack, then the default one
	ret = 0;
	ret = ioctl(fbdev->fd, OMAPFB_WAITFORVSYNC_FRAME, &ret);
	if (ret == 0)
		fbdev->vsync_ioctl = OMAPFB_WAITFORVSYNC_FRAME;
	if (ret != 0) {
		ret = 0;
		ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
		if (ret == 0)
			fbdev->vsync_ioctl = FBIO_WAITFORVSYNC;
	}
	if (ret != 0)
		fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n");

	if (fbdev->buffer_count > 1) {
		fbdev->buffer_write = 0;
		fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
		ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
		if (ret != 0) {
			fbdev->buffer_count = 1;
			fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n");
		}
	}

	printf("fbdev initialized.\n");
	return fbdev;

fail:
	close(fbdev->fd);
fail_open:
	free(fbdev);
	return NULL;
}

static void vout_fbdev_release(struct vout_fbdev *fbdev)
{
	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
	if (fbdev->mem != MAP_FAILED)
		munmap(fbdev->mem, fbdev->mem_size);
	fbdev->mem = NULL;
}

int vout_fbdev_save(struct vout_fbdev *fbdev)
{
	void *tmp;

	if (fbdev == NULL || fbdev->mem == NULL || fbdev->mem == MAP_FAILED) {
		fprintf(stderr, PFX "bad args for save\n");
		return -1;
	}

	if (fbdev->mem_saved_size < fbdev->mem_size) {
		tmp = realloc(fbdev->mem_saved, fbdev->mem_size);
		if (tmp == NULL)
			return -1;
		fbdev->mem_saved = tmp;
	}
	memcpy(fbdev->mem_saved, fbdev->mem, fbdev->mem_size);
	fbdev->mem_saved_size = fbdev->mem_size;

	vout_fbdev_release(fbdev);
	return 0;
}

int vout_fbdev_restore(struct vout_fbdev *fbdev)
{
	int ret;

	if (fbdev == NULL || fbdev->mem != NULL) {
		fprintf(stderr, PFX "bad args/state for restore\n");
		return -1;
	}

	fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	if (fbdev->mem == MAP_FAILED) {
		perror(PFX "restore: memory restore failed");
		return -1;
	}
	memcpy(fbdev->mem, fbdev->mem_saved, fbdev->mem_size);

	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	if (ret == -1) {
		perror(PFX "restore: FBIOPUT_VSCREENINFO");
		return -1;
	}

	return 0;
}

void vout_fbdev_finish(struct vout_fbdev *fbdev)
{
	vout_fbdev_release(fbdev);
	if (fbdev->fd >= 0)
		close(fbdev->fd);
	fbdev->fd = -1;
	free(fbdev);
}
Commit	Line	Data
83b5751b	1	/*
	2	* (C) Gražvydas "notaz" Ignotas, 2009-2010
	3	*
f9b3f440	4	* This work is licensed under the terms of any of these licenses
	5	* (at your option):
	6	* - GNU GPL, version 2 or later.
	7	* - GNU LGPL, version 2.1 or later.
83b5751b	8	* See the COPYING file in the top-level directory.
	9	*/
	10
	11	#include <stdio.h>
	12	#include <stdlib.h>
	13	#include <string.h>
	14	#include <sys/types.h>
	15	#include <sys/stat.h>
	16	#include <fcntl.h>
	17	#include <sys/ioctl.h>
	18	#include <sys/mman.h>
	19	#include <unistd.h>
	20	#include <linux/fb.h>
	21	#include <linux/matroxfb.h>
	22
	23	#include "fbdev.h"
	24
090bcb85	25	#define PFX "fbdev: "
090bcb85	26
d45df001	27	#ifndef OMAPFB_WAITFORVSYNC_FRAME
	28	#define OMAPFB_WAITFORVSYNC_FRAME _IOWR('O', 70, int)
	29	#endif
	30
83b5751b	31	struct vout_fbdev {
	32	int fd;
	33	void *mem;
	34	size_t mem_size;
	35	struct fb_var_screeninfo fbvar_old;
	36	struct fb_var_screeninfo fbvar_new;
	37	int buffer_write;
	38	int fb_size;
	39	int buffer_count;
	40	int top_border, bottom_border;
090bcb85	41	void *mem_saved;
090bcb85	42	size_t mem_saved_size;
d45df001	43	unsigned long vsync_ioctl;
d45df001	44	int vsync_arg;
83b5751b	45	};
	46
	47	void vout_fbdev_flip(struct vout_fbdev fbdev)
	48	{
	49	int draw_buf;
	50
	51	if (fbdev->buffer_count < 2)
	52	return fbdev->mem;
	53
	54	draw_buf = fbdev->buffer_write;
	55	fbdev->buffer_write++;
	56	if (fbdev->buffer_write >= fbdev->buffer_count)
	57	fbdev->buffer_write = 0;
	58
	59	fbdev->fbvar_new.yoffset =
	60	(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
	61	fbdev->top_border;
	62
	63	ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
	64
	65	return (char )fbdev->mem + fbdev->fb_size fbdev->buffer_write;
	66	}
	67
	68	void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
	69	{
d45df001	70	if (fbdev->vsync_ioctl != 0)
d45df001	71	ioctl(fbdev->fd, fbdev->vsync_ioctl, &fbdev->vsync_arg);
83b5751b	72	}
83b5751b	73
f9b3f440	74	/* it is recommended to call vout_fbdev_clear() before this */
	75	void vout_fbdev_resize(struct vout_fbdev fbdev, int w, int h, int bpp,
	76	int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
83b5751b	77	{
	78	int w_total = left_border + w + right_border;
	79	int h_total = top_border + h + bottom_border;
	80	size_t mem_size;
	81	int ret;
	82
	83	// unblank to be sure the mode is really accepted
	84	ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
	85
f9b3f440	86	if (fbdev->fbvar_new.bits_per_pixel != bpp \|\|
	87	fbdev->fbvar_new.xres != w \|\|
	88	fbdev->fbvar_new.yres != h \|\|
	89	fbdev->fbvar_new.xres_virtual != w_total\|\|
	90	fbdev->fbvar_new.yres_virtual < h_total \|\|
	91	fbdev->fbvar_new.xoffset != left_border \|\|
	92	fbdev->buffer_count != buffer_cnt)
	93	{
	94	if (fbdev->fbvar_new.bits_per_pixel != bpp \|\|
	95	w != fbdev->fbvar_new.xres \|\| h != fbdev->fbvar_new.yres)
090bcb85	96	printf(PFX "switching to %dx%d@%d\n", w, h, bpp);
f9b3f440	97
83b5751b	98	fbdev->fbvar_new.xres = w;
	99	fbdev->fbvar_new.yres = h;
	100	fbdev->fbvar_new.xres_virtual = w_total;
f9b3f440	101	fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
83b5751b	102	fbdev->fbvar_new.xoffset = left_border;
f9b3f440	103	fbdev->fbvar_new.yoffset = top_border;
	104	fbdev->fbvar_new.bits_per_pixel = bpp;
	105	fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
	106	fbdev->buffer_count = buffer_cnt;
455c8c43	107	fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0;
83b5751b	108
f9b3f440	109	// seems to help a bit to avoid glitches
f9b3f440	110	vout_fbdev_wait_vsync(fbdev);
83b5751b	111
83b5751b	112	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
83b5751b	113	if (ret == -1) {
f9b3f440	114	// retry with no multibuffering
	115	fbdev->fbvar_new.yres_virtual = h_total;
	116	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	117	if (ret == -1) {
090bcb85	118	perror(PFX "FBIOPUT_VSCREENINFO ioctl");
f9b3f440	119	return NULL;
f9b3f440	120	}
83b5751b	121	fbdev->buffer_count = 1;
f9b3f440	122	fbdev->buffer_write = 0;
090bcb85	123	fprintf(stderr, PFX "Warning: failed to increase virtual resolution, "
f9b3f440	124	"multibuffering disabled\n");
83b5751b	125	}
f9b3f440	126
83b5751b	127	}
83b5751b	128
f9b3f440	129	fbdev->fb_size = w_total * h_total * bpp / 8;
83b5751b	130	fbdev->top_border = top_border;
	131	fbdev->bottom_border = bottom_border;
	132
	133	mem_size = fbdev->fb_size * fbdev->buffer_count;
	134	if (fbdev->mem_size >= mem_size)
f9b3f440	135	goto out;
83b5751b	136
	137	if (fbdev->mem != NULL)
	138	munmap(fbdev->mem, fbdev->mem_size);
	139
	140	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	141	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
090bcb85	142	fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
83b5751b	143	fbdev->buffer_count = 1;
f9b3f440	144	fbdev->buffer_write = 0;
83b5751b	145	mem_size = fbdev->fb_size;
	146	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	147	}
	148	if (fbdev->mem == MAP_FAILED) {
	149	fbdev->mem = NULL;
	150	fbdev->mem_size = 0;
090bcb85	151	perror(PFX "mmap framebuffer");
f9b3f440	152	return NULL;
83b5751b	153	}
	154
	155	fbdev->mem_size = mem_size;
f9b3f440	156
	157	out:
	158	return (char )fbdev->mem + fbdev->fb_size fbdev->buffer_write;
83b5751b	159	}
	160
	161	void vout_fbdev_clear(struct vout_fbdev *fbdev)
	162	{
	163	memset(fbdev->mem, 0, fbdev->mem_size);
	164	}
	165
	166	void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
	167	{
	168	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
	169	int i;
	170
	171	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
	172	count = fbdev->top_border + fbdev->fbvar_new.yres - y;
	173
	174	if (y >= 0 && count > 0)
	175	for (i = 0; i < fbdev->buffer_count; i++)
	176	memset((char )fbdev->mem + fbdev->fb_size i + y * stride, 0, stride * count);
	177	}
	178
	179	int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
	180	{
	181	return fbdev->fd;
	182	}
	183
5cc6dcb7	184	void vout_fbdev_get_active_mem(struct vout_fbdev fbdev)
	185	{
	186	int i;
	187
	188	i = fbdev->buffer_write - 1;
	189	if (i < 0)
	190	i = fbdev->buffer_count - 1;
	191
	192	return (char )fbdev->mem + fbdev->fb_size i;
	193	}
	194
f9b3f440	195	struct vout_fbdev vout_fbdev_init(const char fbdev_name, int w, int h, int bpp, int buffer_cnt)
83b5751b	196	{
	197	struct vout_fbdev *fbdev;
	198	int req_w, req_h;
f9b3f440	199	void *pret;
83b5751b	200	int ret;
	201
	202	fbdev = calloc(1, sizeof(*fbdev));
	203	if (fbdev == NULL)
	204	return NULL;
	205
	206	fbdev->fd = open(fbdev_name, O_RDWR);
	207	if (fbdev->fd == -1) {
090bcb85	208	fprintf(stderr, PFX "%s: ", fbdev_name);
83b5751b	209	perror("open");
	210	goto fail_open;
	211	}
	212
	213	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
	214	if (ret == -1) {
090bcb85	215	perror(PFX "FBIOGET_VSCREENINFO ioctl");
83b5751b	216	goto fail;
	217	}
	218
	219	fbdev->fbvar_new = fbdev->fbvar_old;
	220
	221	req_w = fbdev->fbvar_new.xres;
	222	if (*w != 0)
	223	req_w = *w;
	224	req_h = fbdev->fbvar_new.yres;
	225	if (*h != 0)
	226	req_h = *h;
	227
f9b3f440	228	pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
f9b3f440	229	if (pret == NULL)
83b5751b	230	goto fail;
83b5751b	231
090bcb85	232	printf(PFX "%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres,
090bcb85	233	fbdev->fbvar_new.yres, fbdev->fbvar_new.bits_per_pixel);
83b5751b	234	*w = fbdev->fbvar_new.xres;
	235	*h = fbdev->fbvar_new.yres;
	236
	237	memset(fbdev->mem, 0, fbdev->mem_size);
	238
	239	// some checks
d45df001	240	// screen was unblanked by vout_fbdev_resize(), so vsync should work
d45df001	241	// first try pandora's adaptive vsync hack, then the default one
83b5751b	242	ret = 0;
d45df001	243	ret = ioctl(fbdev->fd, OMAPFB_WAITFORVSYNC_FRAME, &ret);
	244	if (ret == 0)
	245	fbdev->vsync_ioctl = OMAPFB_WAITFORVSYNC_FRAME;
	246	if (ret != 0) {
	247	ret = 0;
	248	ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
	249	if (ret == 0)
	250	fbdev->vsync_ioctl = FBIO_WAITFORVSYNC;
	251	}
83b5751b	252	if (ret != 0)
090bcb85	253	fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n");
83b5751b	254
	255	if (fbdev->buffer_count > 1) {
	256	fbdev->buffer_write = 0;
	257	fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
	258	ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
	259	if (ret != 0) {
	260	fbdev->buffer_count = 1;
090bcb85	261	fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n");
83b5751b	262	}
	263	}
	264
	265	printf("fbdev initialized.\n");
	266	return fbdev;
	267
	268	fail:
	269	close(fbdev->fd);
	270	fail_open:
	271	free(fbdev);
	272	return NULL;
	273	}
	274
090bcb85	275	static void vout_fbdev_release(struct vout_fbdev *fbdev)
83b5751b	276	{
	277	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
	278	if (fbdev->mem != MAP_FAILED)
	279	munmap(fbdev->mem, fbdev->mem_size);
090bcb85	280	fbdev->mem = NULL;
	281	}
	282
	283	int vout_fbdev_save(struct vout_fbdev *fbdev)
	284	{
	285	void *tmp;
	286
	287	if (fbdev == NULL \|\| fbdev->mem == NULL \|\| fbdev->mem == MAP_FAILED) {
	288	fprintf(stderr, PFX "bad args for save\n");
	289	return -1;
	290	}
	291
	292	if (fbdev->mem_saved_size < fbdev->mem_size) {
	293	tmp = realloc(fbdev->mem_saved, fbdev->mem_size);
	294	if (tmp == NULL)
	295	return -1;
	296	fbdev->mem_saved = tmp;
	297	}
	298	memcpy(fbdev->mem_saved, fbdev->mem, fbdev->mem_size);
	299	fbdev->mem_saved_size = fbdev->mem_size;
	300
	301	vout_fbdev_release(fbdev);
	302	return 0;
	303	}
	304
	305	int vout_fbdev_restore(struct vout_fbdev *fbdev)
	306	{
	307	int ret;
	308
	309	if (fbdev == NULL \|\| fbdev->mem != NULL) {
	310	fprintf(stderr, PFX "bad args/state for restore\n");
	311	return -1;
	312	}
	313
	314	fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	315	if (fbdev->mem == MAP_FAILED) {
	316	perror(PFX "restore: memory restore failed");
	317	return -1;
	318	}
	319	memcpy(fbdev->mem, fbdev->mem_saved, fbdev->mem_size);
	320
	321	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	322	if (ret == -1) {
	323	perror(PFX "restore: FBIOPUT_VSCREENINFO");
	324	return -1;
	325	}
	326
	327	return 0;
	328	}
	329
	330	void vout_fbdev_finish(struct vout_fbdev *fbdev)
	331	{
	332	vout_fbdev_release(fbdev);
83b5751b	333	if (fbdev->fd >= 0)
83b5751b	334	close(fbdev->fd);
83b5751b	335	fbdev->fd = -1;
	336	free(fbdev);
	337	}
	338