From: Kronos <kronos@kronoz.cjb.net>
Teach fb to use class_simple. With this patch udev will automagically
create device nodes for each framebuffer registered. Once all drivers are
converted to framebuffer_{alloc,release} we can switch to our own class.
This is what sysfs dir looks like:
notebook:~# tree /sys/class/graphics/
/sys/class/graphics/
`-- fb0
`-- dev
---
25-akpm/drivers/video/fbmem.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+)
diff -puN drivers/video/fbmem.c~sysfs-for-framebuffer drivers/video/fbmem.c
--- 25/drivers/video/fbmem.c~sysfs-for-framebuffer 2004-03-23 22:59:52.850022104 -0800
+++ 25-akpm/drivers/video/fbmem.c 2004-03-23 22:59:52.853021648 -0800
@@ -32,6 +32,9 @@
#include <linux/kmod.h>
#endif
#include <linux/devfs_fs_kernel.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
#if defined(__mc68000__) || defined(CONFIG_APUS)
#include <asm/setup.h>
@@ -1249,6 +1252,8 @@ static struct file_operations fb_fops =
#endif
};
+static struct class_simple *fb_class;
+
/**
* register_framebuffer - registers a frame buffer device
* @fb_info: frame buffer info structure
@@ -1263,6 +1268,7 @@ int
register_framebuffer(struct fb_info *fb_info)
{
int i;
+ struct class_device *c;
if (num_registered_fb == FB_MAX)
return -ENXIO;
@@ -1271,6 +1277,12 @@ register_framebuffer(struct fb_info *fb_
if (!registered_fb[i])
break;
fb_info->node = i;
+
+ c = class_simple_device_add(fb_class, MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
+ if (IS_ERR(c)) {
+ /* Not fatal */
+ printk(KERN_WARNING "Unable to create class_device for framebuffer %d; errno = %ld\n", i, PTR_ERR(c));
+ }
if (fb_info->pixmap.addr == NULL) {
fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
@@ -1336,6 +1348,7 @@ unregister_framebuffer(struct fb_info *f
kfree(fb_info->sprite.addr);
registered_fb[i]=NULL;
num_registered_fb--;
+ class_simple_device_remove(MKDEV(FB_MAJOR, i));
return 0;
}
@@ -1397,6 +1410,12 @@ fbmem_init(void)
if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
printk("unable to get major %d for fb devs\n", FB_MAJOR);
+ fb_class = class_simple_create(THIS_MODULE, "graphics");
+ if (IS_ERR(fb_class)) {
+ printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
+ fb_class = NULL;
+ }
+
#ifdef CONFIG_FB_OF
if (ofonly) {
offb_init();
_