[PATCH] Return the line length via sysfs for fbdev

This small patch returns the stride/line length of the framebuffer via
sysfs.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/video/fbsysfs.c b/drivers/video/fbsysfs.c
index 1147b899f007..007c8e9b2b39 100644
--- a/drivers/video/fbsysfs.c
+++ b/drivers/video/fbsysfs.c
@@ -242,6 +242,13 @@ static ssize_t show_virtual(struct class_device *class_device, char *buf)
                         fb_info->var.yres_virtual);
 }
 
+static ssize_t show_stride(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
+}
+
 /* Format for cmap is "%02x%c%4x%4x%4x\n" */
 /* %02x entry %c transp %4x red %4x blue %4x green \n */
 /* 256 rows at 16 chars equals 4096, the normal page size */
@@ -432,6 +439,7 @@ static struct class_device_attribute class_device_attrs[] = {
         __ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan),
         __ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual),
         __ATTR(name, S_IRUGO, show_name, NULL),
+        __ATTR(stride, S_IRUGO, show_stride, NULL),
 };
 
 int fb_init_class_device(struct fb_info *fb_info)