[PATCH] fbcon: Console Rotation - Add ability to control rotation via sysfs

Add ability to set rotation via sysfs.  The attributes are located in
/sys/class/graphics/fb[n] and accepts 0 - unrotated; 1 - clockwise; 2 - upside
down; 3 - counterclockwise.

The attributes are:

con_rotate (r/w) -   set rotation of the active console
con_rotate_all (w) - set rotation of all consoles
rotate (r/w) -       set rotation of the framebuffer, if supported.
Currently, none of the drivers support this.

This is probably temporary, since con_rotate and con_rotate_all are
console-specific and has no business being under the fb device.  However,
until the console layer acquires it's own sysfs class, these attributes will
temporarily reside here.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/video/fbsysfs.c b/drivers/video/fbsysfs.c
index 007c8e9b2b39..08dac9580d15 100644
--- a/drivers/video/fbsysfs.c
+++ b/drivers/video/fbsysfs.c
@@ -213,6 +213,70 @@ static ssize_t show_bpp(struct class_device *class_device, char *buf)
         return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
 }
 
+static ssize_t store_rotate(struct class_device *class_device, const char *buf,
+                            size_t count)
+{
+        struct fb_info *fb_info = class_get_devdata(class_device);
+        struct fb_var_screeninfo var;
+        char **last = NULL;
+        int err;
+
+        var = fb_info->var;
+        var.rotate = simple_strtoul(buf, last, 0);
+
+        if ((err = activate(fb_info, &var)))
+                return err;
+
+        return count;
+}
+
+
+static ssize_t show_rotate(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info = class_get_devdata(class_device);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
+}
+
+static ssize_t store_con_rotate(struct class_device *class_device,
+                                const char *buf, size_t count)
+{
+        struct fb_info *fb_info = class_get_devdata(class_device);
+        int rotate;
+        char **last = NULL;
+
+        acquire_console_sem();
+        rotate = simple_strtoul(buf, last, 0);
+        fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE, &rotate);
+        release_console_sem();
+        return count;
+}
+
+static ssize_t store_con_rotate_all(struct class_device *class_device,
+                                const char *buf, size_t count)
+{
+        struct fb_info *fb_info = class_get_devdata(class_device);
+        int rotate;
+        char **last = NULL;
+
+        acquire_console_sem();
+        rotate = simple_strtoul(buf, last, 0);
+        fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE_ALL, &rotate);
+        release_console_sem();
+        return count;
+}
+
+static ssize_t show_con_rotate(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info = class_get_devdata(class_device);
+        int rotate;
+
+        acquire_console_sem();
+        rotate = fb_con_duit(fb_info, FB_EVENT_GET_CON_ROTATE, NULL);
+        release_console_sem();
+        return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
+}
+
 static ssize_t store_virtual(struct class_device *class_device,
                              const char * buf, size_t count)
 {
@@ -440,6 +504,9 @@ static struct class_device_attribute class_device_attrs[] = {
         __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),
+        __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
+        __ATTR(con_rotate, S_IRUGO|S_IWUSR, show_con_rotate, store_con_rotate),
+        __ATTR(con_rotate_all, S_IWUSR, NULL, store_con_rotate_all),
 };
 
 int fb_init_class_device(struct fb_info *fb_info)