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[PATCH] fbdev: colormap fixes 

Color maps have up to 256 entries.  4096/256 allows for 16 characters per
line.  The format for a cmap entry is "%02x%c%4x%4x%4x\n" %02x entry %c
transp %4x red %4x blue %4x green

You can read the color_map with cat fb0/color_map.

Signed-off-by: Jon Smirl <jonsmirl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Jon Smirl 2005-07-27 11:46:05 -07:00 committed by Linus Torvalds
parent 3ca34fcbfb
commit d210224732
1 changed files with 72 additions and 10 deletions
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82
drivers/video/fbsysfs.c
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@ -242,10 +242,68 @@ static ssize_t show_virtual(struct class_device *class_device, char *buf)
fb_info->var.yres_virtual);
}
static ssize_t store_cmap(struct class_device *class_device, const char * buf,
/* Format for cmap is "%02x%c%4x%4x%4x\n" */
/* %02x entry %c transp %4x red %4x blue %4x green \n */
/* 255 rows at 16 chars equals 4096 */
/* PAGE_SIZE can be 4096 or larger */
static ssize_t store_cmap(struct class_device *class_device, const char *buf,
size_t count)
{
// struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
int rc, i, start, length, transp = 0;
if ((count > 4096) || ((count % 16) != 0) || (PAGE_SIZE < 4096))
return -EINVAL;
if (!fb_info->fbops->fb_setcolreg && !fb_info->fbops->fb_setcmap)
return -EINVAL;
sscanf(buf, "%02x", &start);
length = count / 16;
for (i = 0; i < length; i++)
if (buf[i * 16 + 2] != ' ')
transp = 1;
/* If we can batch, do it */
if (fb_info->fbops->fb_setcmap && length > 1) {
struct fb_cmap umap;
memset(&umap, 0, sizeof(umap));
if ((rc = fb_alloc_cmap(&umap, length, transp)))
return rc;
umap.start = start;
for (i = 0; i < length; i++) {
sscanf(&buf[i * 16 + 3], "%4hx", &umap.red[i]);
sscanf(&buf[i * 16 + 7], "%4hx", &umap.blue[i]);
sscanf(&buf[i * 16 + 11], "%4hx", &umap.green[i]);
if (transp)
umap.transp[i] = (buf[i * 16 + 2] != ' ');
}
rc = fb_info->fbops->fb_setcmap(&umap, fb_info);
fb_copy_cmap(&umap, &fb_info->cmap);
fb_dealloc_cmap(&umap);
return rc;
}
for (i = 0; i < length; i++) {
u16 red, blue, green, tsp;
sscanf(&buf[i * 16 + 3], "%4hx", &red);
sscanf(&buf[i * 16 + 7], "%4hx", &blue);
sscanf(&buf[i * 16 + 11], "%4hx", &green);
tsp = (buf[i * 16 + 2] != ' ');
if ((rc = fb_info->fbops->fb_setcolreg(start++,
red, green, blue, tsp, fb_info)))
return rc;
fb_info->cmap.red[i] = red;
fb_info->cmap.blue[i] = blue;
fb_info->cmap.green[i] = green;
if (transp)
fb_info->cmap.transp[i] = tsp;
}
return 0;
}
@ -253,20 +311,24 @@ static ssize_t show_cmap(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info =
(struct fb_info *)class_get_devdata(class_device);
unsigned int offset = 0, i;
unsigned int i;
if (!fb_info->cmap.red || !fb_info->cmap.blue ||
!fb_info->cmap.green || !fb_info->cmap.transp)
!fb_info->cmap.green)
return -EINVAL;
if (PAGE_SIZE < 4096)
return -EINVAL;
/* don't mess with the format, the buffer is PAGE_SIZE */
/* 255 entries at 16 chars per line equals 4096 = PAGE_SIZE */
for (i = 0; i < fb_info->cmap.len; i++) {
offset += snprintf(buf, PAGE_SIZE - offset,
"%d,%d,%d,%d,%d\n", i + fb_info->cmap.start,
fb_info->cmap.red[i], fb_info->cmap.blue[i],
fb_info->cmap.green[i],
fb_info->cmap.transp[i]);
sprintf(&buf[ i * 16], "%02x%c%4x%4x%4x\n", i + fb_info->cmap.start,
((fb_info->cmap.transp && fb_info->cmap.transp[i]) ? '*' : ' '),
fb_info->cmap.red[i], fb_info->cmap.blue[i],
fb_info->cmap.green[i]);
}
return offset;
return 4096;
}
static ssize_t store_blank(struct class_device *class_device, const char * buf,