HT16K33_FB_SIZE
while (pos < HT16K33_FB_SIZE && first < 0) {
len = HT16K33_FB_SIZE - first;
p1 = fbdev->cache + HT16K33_FB_SIZE - 1;
p2 = fbdev->buffer + HT16K33_FB_SIZE - 1;
uint8_t data[HT16K33_FB_SIZE];
BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE);
fbdev->cache = devm_kmalloc(dev, HT16K33_FB_SIZE, GFP_KERNEL);
fbdev->info->screen_size = HT16K33_FB_SIZE;