1 #include <linux/kernel.h>
2 #include <linux/spinlock.h>
3 #include <linux/device.h>
5 #include <linux/kdev_t.h>
9 static struct class *dca_class;
10 static struct idr dca_idr;
11 static spinlock_t dca_idr_lock;
13 int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
17 cd = device_create_drvdata(dca_class, dca->cd,
18 MKDEV(0, slot + 1), NULL,
25 void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
27 device_destroy(dca_class, MKDEV(0, slot + 1));
30 int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
36 if (!idr_pre_get(&dca_idr, GFP_KERNEL))
38 spin_lock(&dca_idr_lock);
39 err = idr_get_new(&dca_idr, dca, &dca->id);
40 spin_unlock(&dca_idr_lock);
50 cd = device_create_drvdata(dca_class, dev, MKDEV(0, 0), NULL,
53 spin_lock(&dca_idr_lock);
54 idr_remove(&dca_idr, dca->id);
55 spin_unlock(&dca_idr_lock);
62 void dca_sysfs_remove_provider(struct dca_provider *dca)
64 device_unregister(dca->cd);
66 spin_lock(&dca_idr_lock);
67 idr_remove(&dca_idr, dca->id);
68 spin_unlock(&dca_idr_lock);
71 int __init dca_sysfs_init(void)
74 spin_lock_init(&dca_idr_lock);
76 dca_class = class_create(THIS_MODULE, "dca");
77 if (IS_ERR(dca_class)) {
78 idr_destroy(&dca_idr);
79 return PTR_ERR(dca_class);
84 void __exit dca_sysfs_exit(void)
86 class_destroy(dca_class);
87 idr_destroy(&dca_idr);