[PATCH 3/5] Video Mode Handling - Delete entries from mode list

["Antonino A. Daplas" <adaplas@hotpop.com>]

Hi,

This is optional but applying it should enhance fbdev functionality.

The patch allows removal of entries to the mode list.  This is done by setting the
var->activate field to FB_ACTIVATE_INV_MODE.  Only modes that are not in
use by any of the console or by the current var will be deleted.

The diff is against 2.6.8-rc3-mm1 but should apply cleanly to 2.6.8-rc3-mm2
as well.

Tony

Signed-off-by: Antonino Daplas <adaplas@pol.net>
---

 drivers/video/console/fbcon.c |   35 ++++++++++++++++++++++++++++++++++-
 drivers/video/fbmem.c         |   28 +++++++++++++++++++++++++---
 include/linux/fb.h            |    9 +++++++++
 3 files changed, 68 insertions(+), 4 deletions(-)

diff -uprN linux-2.6.8-rc3-mm1-orig/drivers/video/console/fbcon.c linux-2.6.8-rc3-mm1/drivers/video/console/fbcon.c
--- linux-2.6.8-rc3-mm1-orig/drivers/video/console/fbcon.c	2004-08-08 22:32:24.759309552 +0800
+++ linux-2.6.8-rc3-mm1/drivers/video/console/fbcon.c	2004-08-08 22:33:05.726081656 +0800
@@ -2671,10 +2671,39 @@ static void fbcon_modechanged(struct fb_
 	}
 }
 
+static void fbcon_mode_deleted(struct fb_info *info,
+			       struct fb_videomode *mode)
+{
+	struct fb_info *fb_info;
+	struct display *p;
+	int i, j, found = 0;
+
+	/* before deletion, ensure that mode is not in use */
+	for (i = first_fb_vc; i <= last_fb_vc; i++) {
+		j = (int) con2fb_map[i];
+		if (j == -1)
+			continue;
+		fb_info = registered_fb[j];
+		if (fb_info != info)
+			continue;
+		p = &fb_display[i];
+		if (!p || !p->mode)
+			continue;
+		if (fb_mode_is_equal(p->mode, mode)) {
+			found = 1;
+			break;
+		}
+	}
+	if (!found)
+		fb_delete_videomode(mode, &info->monspecs.modelist);
+}
+
 static int fbcon_event_notify(struct notifier_block *self, 
 			      unsigned long action, void *data)
 {
-	struct fb_info *info = (struct fb_info *) data;
+	struct fb_event *event = (struct fb_event *) data;
+	struct fb_info *info = event->info;
+	struct fb_videomode *mode;
 
 	switch(action) {
 	case FB_EVENT_SUSPEND:
@@ -2686,6 +2715,10 @@ static int fbcon_event_notify(struct not
 	case FB_EVENT_MODE_CHANGE:
 		fbcon_modechanged(info);
 		break;
+	case FB_EVENT_MODE_DELETE:
+		mode = (struct fb_videomode *) event->data;
+		fbcon_mode_deleted(info, mode);
+		break;
 	}
 
 	return 0;
diff -uprN linux-2.6.8-rc3-mm1-orig/drivers/video/fbmem.c linux-2.6.8-rc3-mm1/drivers/video/fbmem.c
--- linux-2.6.8-rc3-mm1-orig/drivers/video/fbmem.c	2004-08-08 22:32:24.784305752 +0800
+++ linux-2.6.8-rc3-mm1/drivers/video/fbmem.c	2004-08-08 22:32:57.384349792 +0800
@@ -1083,6 +1083,22 @@ fb_set_var(struct fb_info *info, struct 
 {
 	int err;
 
+	if (var->activate & FB_ACTIVATE_INV_MODE) {
+		struct fb_videomode mode1, mode2;
+		struct fb_event event;
+
+		fb_var_to_videomode(&mode1, var);
+		fb_var_to_videomode(&mode2, &info->var);
+		/* make sure we don't delete the videomode of current var */
+		if (fb_mode_is_equal(&mode1, &mode2))
+			return -EINVAL;
+		event.info = info;
+		event.data = &mode1;
+		notifier_call_chain(&fb_notifier_list, FB_EVENT_MODE_DELETE,
+				    &event);
+		return 0;
+	}
+
 	if ((var->activate & FB_ACTIVATE_FORCE) ||
 	    memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
 		if (!info->fbops->fb_check_var) {
@@ -1108,9 +1124,12 @@ fb_set_var(struct fb_info *info, struct 
 			fb_add_videomode(&mode, &info->monspecs.modelist);
 
 			if (info->flags & FBINFO_MISC_MODECHANGEUSER) {
+				struct fb_event event;
+
 				info->flags &= ~FBINFO_MISC_MODECHANGEUSER;
+				event.info = info;
 				notifier_call_chain(&fb_notifier_list,
-						    FB_EVENT_MODE_CHANGE, info);
+						    FB_EVENT_MODE_CHANGE, &event);
 			}
 		}
 	}
@@ -1520,12 +1539,15 @@ int fb_unregister_client(struct notifier
  */
 void fb_set_suspend(struct fb_info *info, int state)
 {
+	struct fb_event event;
+	
+	event.info = info;
 	if (state) {
-		notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, info);
+		notifier_call_chain(&fb_notifier_list, FB_EVENT_SUSPEND, &event);
 		info->state = FBINFO_STATE_SUSPENDED;
 	} else {
 		info->state = FBINFO_STATE_RUNNING;
-		notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, info);
+		notifier_call_chain(&fb_notifier_list, FB_EVENT_RESUME, &event);
 	}
 }
 
diff -uprN linux-2.6.8-rc3-mm1-orig/include/linux/fb.h linux-2.6.8-rc3-mm1/include/linux/fb.h
--- linux-2.6.8-rc3-mm1-orig/include/linux/fb.h	2004-08-08 22:32:24.827299216 +0800
+++ linux-2.6.8-rc3-mm1/include/linux/fb.h	2004-08-08 22:32:42.715579784 +0800
@@ -159,6 +159,7 @@ struct fb_bitfield {
 #define FB_CHANGE_CMAP_VBL     32	/* change colormap on vbl	*/
 #define FB_ACTIVATE_ALL	       64	/* change all VCs on this fb	*/
 #define FB_ACTIVATE_FORCE     128	/* force apply even when no change*/
+#define FB_ACTIVATE_INV_MODE  256       /* invalidate videomode */
 
 #define FB_ACCELF_TEXT		1	/* (OBSOLETE) see fb_info.flags and vc_mode */
 
@@ -449,6 +450,14 @@ struct fb_cursor_user {
  *	if you own it
  */
 #define FB_EVENT_RESUME			0x03
+/*      An entry from the modelist was removed */
+#define FB_EVENT_MODE_DELETE            0x04
+
+struct fb_event {
+	struct fb_info *info;
+	void *data;
+};
+
 
 extern int fb_register_client(struct notifier_block *nb);
 extern int fb_unregister_client(struct notifier_block *nb);




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