[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, 72 insertions, 0 deletions

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index e829ba18e0a5..e7802ffe549a 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -193,6 +193,8 @@ static void fbcon_preset_disp(struct fb_info *info, struct fb_var_screeninfo *va
                               int unit);
 static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
                               int line, int count, int dy);
+static void fbcon_modechanged(struct fb_info *info);
+static void fbcon_set_all_vcs(struct fb_info *info);
 
 #ifdef CONFIG_MAC
 /*
@@ -218,6 +220,51 @@ static inline void fbcon_set_rotation(struct fb_info *info, struct display *p)
         else
                 ops->rotate = 0;
 }
+
+static void fbcon_rotate(struct fb_info *info, u32 rotate)
+{
+        struct fbcon_ops *ops= info->fbcon_par;
+        struct fb_info *fb_info;
+
+        if (!ops || ops->currcon == -1)
+                return;
+
+        fb_info = registered_fb[con2fb_map[ops->currcon]];
+
+        if (info == fb_info) {
+                struct display *p = &fb_display[ops->currcon];
+
+                if (rotate < 4)
+                        p->con_rotate = rotate;
+                else
+                        p->con_rotate = 0;
+
+                fbcon_modechanged(info);
+        }
+}
+
+static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
+{
+        struct fbcon_ops *ops = info->fbcon_par;
+        struct vc_data *vc;
+        struct display *p;
+        int i;
+
+        if (!ops || ops->currcon < 0 || rotate > 3)
+                return;
+
+        for (i = 0; i < MAX_NR_CONSOLES; i++) {
+                vc = vc_cons[i].d;
+                if (!vc || vc->vc_mode != KD_TEXT ||
+                    registered_fb[con2fb_map[i]] != info)
+                        continue;
+
+                p = &fb_display[vc->vc_num];
+                p->con_rotate = rotate;
+        }
+
+        fbcon_set_all_vcs(info);
+}
 #else
 static inline void fbcon_set_rotation(struct fb_info *info, struct display *p)
 {
@@ -225,8 +272,25 @@ static inline void fbcon_set_rotation(struct fb_info *info, struct display *p)
 
         ops->rotate = FB_ROTATE_UR;
 }
+
+static void fbcon_rotate(struct fb_info *info, u32 rotate)
+{
+        return;
+}
+
+static void fbcon_rotate_all(struct fb_info *info, u32 rotate)
+{
+        return;
+}
 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 
+static int fbcon_get_rotate(struct fb_info *info)
+{
+        struct fbcon_ops *ops = info->fbcon_par;
+
+        return (ops) ? ops->rotate : 0;
+}
+
 static inline int fbcon_is_inactive(struct vc_data *vc, struct fb_info *info)
 {
         struct fbcon_ops *ops = info->fbcon_par;
@@ -2864,6 +2928,14 @@ static int fbcon_event_notify(struct notifier_block *self,
         case FB_EVENT_NEW_MODELIST:
                 fbcon_new_modelist(info);
                 break;
+        case FB_EVENT_SET_CON_ROTATE:
+                fbcon_rotate(info, *(int *)event->data);
+                break;
+        case FB_EVENT_GET_CON_ROTATE:
+                ret = fbcon_get_rotate(info);
+                break;
+        case FB_EVENT_SET_CON_ROTATE_ALL:
+                fbcon_rotate_all(info, *(int *)event->data);
         }
 
         return ret;