#include <linux/kobject.h>
#include <linux/kobj_map.h>
#include <linux/cdev.h>
+#include <linux/mutex.h>
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#define MAX_PROBE_HASH 255 /* random */
-static DECLARE_MUTEX(chrdevs_lock);
+static DEFINE_MUTEX(chrdevs_lock);
static struct char_device_struct {
struct char_device_struct *next;
unsigned int major;
unsigned int baseminor;
int minorct;
- const char *name;
+ char name[64];
struct file_operations *fops;
struct cdev *cdev; /* will die */
} *chrdevs[MAX_PROBE_HASH];
return major % MAX_PROBE_HASH;
}
-/* get char device names in somewhat random order */
-int get_chrdev_list(char *page)
+struct chrdev_info {
+ int index;
+ struct char_device_struct *cd;
+};
+
+void *get_next_chrdev(void *dev)
+{
+ struct chrdev_info *info;
+
+ if (dev == NULL) {
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ goto out;
+ info->index=0;
+ info->cd = chrdevs[info->index];
+ if (info->cd)
+ goto out;
+ } else {
+ info = dev;
+ }
+
+ while (info->index < ARRAY_SIZE(chrdevs)) {
+ if (info->cd)
+ info->cd = info->cd->next;
+ if (info->cd)
+ goto out;
+ /*
+ * No devices on this chain, move to the next
+ */
+ info->index++;
+ info->cd = (info->index < ARRAY_SIZE(chrdevs)) ?
+ chrdevs[info->index] : NULL;
+ if (info->cd)
+ goto out;
+ }
+
+out:
+ return info;
+}
+
+void *acquire_chrdev_list(void)
+{
+ mutex_lock(&chrdevs_lock);
+ return get_next_chrdev(NULL);
+}
+
+void release_chrdev_list(void *dev)
+{
+ mutex_unlock(&chrdevs_lock);
+ kfree(dev);
+}
+
+
+int count_chrdev_list(void)
{
struct char_device_struct *cd;
- int i, len;
+ int i, count;
- len = sprintf(page, "Character devices:\n");
+ count = 0;
- down(&chrdevs_lock);
for (i = 0; i < ARRAY_SIZE(chrdevs) ; i++) {
for (cd = chrdevs[i]; cd; cd = cd->next)
- len += sprintf(page+len, "%3d %s\n",
- cd->major, cd->name);
+ count++;
}
- up(&chrdevs_lock);
- return len;
+ return count;
+}
+
+int get_chrdev_info(void *dev, int *major, char **name)
+{
+ struct chrdev_info *info = dev;
+
+ if (info->cd == NULL)
+ return 1;
+
+ *major = info->cd->major;
+ *name = info->cd->name;
+ return 0;
}
/*
memset(cd, 0, sizeof(struct char_device_struct));
- down(&chrdevs_lock);
+ mutex_lock(&chrdevs_lock);
/* temporary */
if (major == 0) {
cd->major = major;
cd->baseminor = baseminor;
cd->minorct = minorct;
- cd->name = name;
+ strncpy(cd->name,name, 64);
i = major_to_index(major);
}
cd->next = *cp;
*cp = cd;
- up(&chrdevs_lock);
+ mutex_unlock(&chrdevs_lock);
return cd;
out:
- up(&chrdevs_lock);
+ mutex_unlock(&chrdevs_lock);
kfree(cd);
return ERR_PTR(ret);
}
struct char_device_struct *cd = NULL, **cp;
int i = major_to_index(major);
- up(&chrdevs_lock);
+ mutex_lock(&chrdevs_lock);
for (cp = &chrdevs[i]; *cp; cp = &(*cp)->next)
if ((*cp)->major == major &&
(*cp)->baseminor == baseminor &&
cd = *cp;
*cp = cd->next;
}
- up(&chrdevs_lock);
+ mutex_unlock(&chrdevs_lock);
return cd;
}
void cdev_put(struct cdev *p)
{
if (p) {
+ struct module *owner = p->owner;
kobject_put(&p->kobj);
- module_put(p->owner);
+ module_put(owner);
}
}