[PATCH] Detaching fbcon: sdd sysfs class device entry for fbcon

In order for this feature to work, an interface will be needed.  The most
appropriate is sysfs.  However, the framebuffer console has no sysfs entry
yet.  This will create a sysfs class device entry for fbcon under
/sys/class/graphics.

Add a class_device entry 'fbcon' under class 'graphics'.  Console-specific
attributes which where previously under class/graphics/fb[x] are moved to
class/graphics/fbcon.  These attributes, 'con_rotate' and 'con_rotate_all',
are also renamed to 'rotate' and 'rotate_all' respectively.

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

5 files changed, 112 insertions, 76 deletions

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index b7dfee2..c335e9b 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -4,15 +4,15 @@
 
 # Each configuration option enables a list of files.
 
-obj-$(CONFIG_VT)		  += console/
-obj-$(CONFIG_LOGO)		  += logo/
-obj-$(CONFIG_SYSFS)		  += backlight/
-
 obj-$(CONFIG_FB)                  += fb.o
 fb-y                              := fbmem.o fbmon.o fbcmap.o fbsysfs.o \
                                      modedb.o fbcvt.o
 fb-objs                           := $(fb-y)
 
+obj-$(CONFIG_VT)		  += console/
+obj-$(CONFIG_LOGO)		  += logo/
+obj-$(CONFIG_SYSFS)		  += backlight/
+
 obj-$(CONFIG_FB_CFB_FILLRECT)  += cfbfillrect.o
 obj-$(CONFIG_FB_CFB_COPYAREA)  += cfbcopyarea.o
 obj-$(CONFIG_FB_CFB_IMAGEBLIT) += cfbimgblt.o
diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index 47ba1a7..746225b 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -195,6 +195,8 @@ static void fbcon_redraw_move(struct vc_data *vc, struct display *p,
 static void fbcon_modechanged(struct fb_info *info);
 static void fbcon_set_all_vcs(struct fb_info *info);
 
+static struct class_device *fbcon_class_device;
+
 #ifdef CONFIG_MAC
 /*
  * On the Macintoy, there may or may not be a working VBL int. We need to probe
@@ -2945,14 +2947,6 @@ 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;
@@ -2992,6 +2986,81 @@ static struct notifier_block fbcon_event_notifier = {
 	.notifier_call	= fbcon_event_notify,
 };
 
+static ssize_t store_rotate(struct class_device *class_device,
+			    const char *buf, size_t count)
+{
+	struct fb_info *info;
+	int rotate, idx;
+	char **last = NULL;
+
+	acquire_console_sem();
+	idx = con2fb_map[fg_console];
+
+	if (idx == -1 || registered_fb[idx] == NULL)
+		goto err;
+
+	info = registered_fb[idx];
+	rotate = simple_strtoul(buf, last, 0);
+	fbcon_rotate(info, rotate);
+err:
+	release_console_sem();
+	return count;
+}
+
+static ssize_t store_rotate_all(struct class_device *class_device,
+				const char *buf, size_t count)
+{
+	struct fb_info *info;
+	int rotate, idx;
+	char **last = NULL;
+
+	acquire_console_sem();
+	idx = con2fb_map[fg_console];
+
+	if (idx == -1 || registered_fb[idx] == NULL)
+		goto err;
+
+	info = registered_fb[idx];
+	rotate = simple_strtoul(buf, last, 0);
+	fbcon_rotate_all(info, rotate);
+err:
+	release_console_sem();
+	return count;
+}
+
+static ssize_t show_rotate(struct class_device *class_device, char *buf)
+{
+	struct fb_info *info;
+	int rotate = 0, idx;
+
+	acquire_console_sem();
+	idx = con2fb_map[fg_console];
+
+	if (idx == -1 || registered_fb[idx] == NULL)
+		goto err;
+
+	info = registered_fb[idx];
+	rotate = fbcon_get_rotate(info);
+err:
+	release_console_sem();
+	return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
+}
+
+static struct class_device_attribute class_device_attrs[] = {
+	__ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
+	__ATTR(rotate_all, S_IWUSR, NULL, store_rotate_all),
+};
+
+static int fbcon_init_class_device(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
+		class_device_create_file(fbcon_class_device,
+					 &class_device_attrs[i]);
+	return 0;
+}
+
 static int __init fb_console_init(void)
 {
 	int i;
@@ -3000,6 +3069,18 @@ static int __init fb_console_init(void)
 	fb_register_client(&fbcon_event_notifier);
 	release_console_sem();
 
+	fbcon_class_device =
+	    class_device_create(fb_class, NULL,
+				MKDEV(FB_MAJOR, FB_MAX), NULL,
+				"fbcon");
+	if (IS_ERR(fbcon_class_device)) {
+	    printk(KERN_WARNING "Unable to create class_device "
+		   "for fbcon; errno = %ld\n",
+		   PTR_ERR(fbcon_class_device));
+	    fbcon_class_device = NULL;
+	} else
+	    fbcon_init_class_device();
+
 	for (i = 0; i < MAX_NR_CONSOLES; i++)
 		con2fb_map[i] = -1;
 
@@ -3020,10 +3101,26 @@ module_init(fb_console_init);
 
 #ifdef MODULE
 
+static void __exit fbcon_deinit_class_device(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
+		class_device_remove_file(fbcon_class_device,
+					 &class_device_attrs[i]);
+}
+
+static void __exit fbcon_exit(void)
+{
+	fbcon_deinit_class_device();
+	class_device_destroy(fb_class, MKDEV(FB_MAJOR, FB_MAX));
+}
+
 static void __exit fb_console_exit(void)
 {
 	acquire_console_sem();
 	fb_unregister_client(&fbcon_event_notifier);
+	fbcon_exit();
 	release_console_sem();
 	give_up_console(&fb_con);
 }	
diff --git a/drivers/video/console/fbcon.h b/drivers/video/console/fbcon.h
index c38c3d8..3487a63 100644
--- a/drivers/video/console/fbcon.h
+++ b/drivers/video/console/fbcon.h
@@ -175,6 +175,7 @@ extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
 #endif
 extern void fbcon_set_bitops(struct fbcon_ops *ops);
 extern int  soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
+extern struct class *fb_class;
 
 #define FBCON_ATTRIBUTE_UNDERLINE 1
 #define FBCON_ATTRIBUTE_REVERSE   2
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index e9af5e6..a2102a5 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1276,8 +1276,8 @@ static struct file_operations fb_fops = {
 #endif
 };
 
-static struct class *fb_class;
-
+struct class *fb_class;
+EXPORT_SYMBOL(fb_class);
 /**
  *	register_framebuffer - registers a frame buffer device
  *	@fb_info: frame buffer info structure
@@ -1489,27 +1489,6 @@ int fb_new_modelist(struct fb_info *info)
 	return err;
 }
 
-/**
- * fb_con_duit - user<->fbcon passthrough
- * @info: struct fb_info
- * @event: notification event to be passed to fbcon
- * @data: private data
- *
- * DESCRIPTION
- * This function is an fbcon-user event passing channel
- * which bypasses fbdev.  This is hopefully temporary
- * until a user interface for fbcon is created
- */
-int fb_con_duit(struct fb_info *info, int event, void *data)
-{
-	struct fb_event evnt;
-
-	evnt.info = info;
-	evnt.data = data;
-
-	return blocking_notifier_call_chain(&fb_notifier_list, event, &evnt);
-}
-
 static char *video_options[FB_MAX];
 static int ofonly;
 
diff --git a/drivers/video/fbsysfs.c b/drivers/video/fbsysfs.c
index 6de0218..4f78f23 100644
--- a/drivers/video/fbsysfs.c
+++ b/drivers/video/fbsysfs.c
@@ -247,45 +247,6 @@ static ssize_t show_rotate(struct class_device *class_device, char *buf)
 	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)
 {
@@ -502,8 +463,6 @@ static struct class_device_attribute class_device_attrs[] = {
 	__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),
 	__ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate),
 #ifdef CONFIG_FB_BACKLIGHT
 	__ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve),