From: Greg KH <greg@kroah.com>
This adds /sys/class/mem which enables all mem char devices to show up
properly in udev.
Has been posted to linux-kernel every so often since last July, and
acked by a number of other kernel developers.
drivers/char/mem.c | 33 ++++++++++++++++++++++++++++++++-
1 files changed, 32 insertions(+), 1 deletion(-)
diff -puN drivers/char/mem.c~sysfs-mem-device-support drivers/char/mem.c
--- 25/drivers/char/mem.c~sysfs-mem-device-support 2003-12-22 20:19:04.000000000 -0800
+++ 25-akpm/drivers/char/mem.c 2003-12-22 20:19:04.000000000 -0800
@@ -24,6 +24,7 @@
#include <linux/smp_lock.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/ptrace.h>
+#include <linux/device.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -656,7 +657,7 @@ static struct file_operations memory_fop
.open = memory_open, /* just a selector for the real open */
};
-static const struct {
+static const struct mem_dev {
unsigned int minor;
char *name;
umode_t mode;
@@ -675,6 +676,23 @@ static const struct {
{11,"kmsg", S_IRUGO | S_IWUSR, &kmsg_fops},
};
+static void release_mem_dev(struct class_device *class_dev)
+{
+ kfree(class_dev);
+}
+
+static struct class mem_class = {
+ .name = "mem",
+ .release = &release_mem_dev,
+};
+
+static ssize_t show_dev(struct class_device *class_dev, char *buf)
+{
+ struct mem_dev *mem_dev = class_get_devdata(class_dev);
+ return print_dev_t(buf, MKDEV(MEM_MAJOR, mem_dev->minor));
+}
+static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
+
static int __init chr_dev_init(void)
{
int i;
@@ -682,7 +700,20 @@ static int __init chr_dev_init(void)
if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))
printk("unable to get major %d for memory devs\n", MEM_MAJOR);
+ class_register(&mem_class);
for (i = 0; i < ARRAY_SIZE(devlist); i++) {
+ struct class_device *class_dev;
+
+ class_dev = kmalloc(sizeof(*class_dev), GFP_KERNEL);
+ if (class_dev) {
+ memset(class_dev, 0x00, sizeof(*class_dev));
+ class_dev->class = &mem_class;
+ strncpy(class_dev->class_id, devlist[i].name, BUS_ID_SIZE);
+ class_set_devdata(class_dev, (void *)&devlist[i]);
+ if (!class_device_register(class_dev));
+ class_device_create_file(class_dev, &class_device_attr_dev);
+ }
+
devfs_mk_cdev(MKDEV(MEM_MAJOR, devlist[i].minor),
S_IFCHR | devlist[i].mode, devlist[i].name);
}
_