DCA: Add Direct Cache Access driver

[pandora-kernel.git] / drivers / dca / dca-sysfs.c

diff --git a/drivers/dca/dca-sysfs.c b/drivers/dca/dca-sysfs.c
new file mode 100644 (file)
index 0000000..24a263b
--- /dev/null
+++ b/drivers/dca/dca-sysfs.c
@@ -0,0 +1,88 @@
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/idr.h>
+#include <linux/kdev_t.h>
+#include <linux/err.h>
+#include <linux/dca.h>
+
+static struct class *dca_class;
+static struct idr dca_idr;
+static spinlock_t dca_idr_lock;
+
+int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
+{
+       struct class_device *cd;
+
+       cd = class_device_create(dca_class, dca->cd, MKDEV(0, slot + 1),
+                                dev, "requester%d", slot);
+       if (IS_ERR(cd))
+               return PTR_ERR(cd);
+       return 0;
+}
+
+void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
+{
+       class_device_destroy(dca_class, MKDEV(0, slot + 1));
+}
+
+int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
+{
+       struct class_device *cd;
+       int err = 0;
+
+idr_try_again:
+       if (!idr_pre_get(&dca_idr, GFP_KERNEL))
+               return -ENOMEM;
+       spin_lock(&dca_idr_lock);
+       err = idr_get_new(&dca_idr, dca, &dca->id);
+       spin_unlock(&dca_idr_lock);
+       switch (err) {
+       case 0:
+               break;
+       case -EAGAIN:
+               goto idr_try_again;
+       default:
+               return err;
+       }
+
+       cd = class_device_create(dca_class, NULL, MKDEV(0, 0),
+                                dev, "dca%d", dca->id);
+       if (IS_ERR(cd)) {
+               spin_lock(&dca_idr_lock);
+               idr_remove(&dca_idr, dca->id);
+               spin_unlock(&dca_idr_lock);
+               return PTR_ERR(cd);
+       }
+       dca->cd = cd;
+       return 0;
+}
+
+void dca_sysfs_remove_provider(struct dca_provider *dca)
+{
+       class_device_unregister(dca->cd);
+       dca->cd = NULL;
+       spin_lock(&dca_idr_lock);
+       idr_remove(&dca_idr, dca->id);
+       spin_unlock(&dca_idr_lock);
+}
+
+int __init dca_sysfs_init(void)
+{
+       idr_init(&dca_idr);
+       spin_lock_init(&dca_idr_lock);
+
+       dca_class = class_create(THIS_MODULE, "dca");
+       if (IS_ERR(dca_class)) {
+               idr_destroy(&dca_idr);
+               return PTR_ERR(dca_class);
+       }
+       return 0;
+}
+
+void __exit dca_sysfs_exit(void)
+{
+       class_destroy(dca_class);
+       idr_destroy(&dca_idr);
+}
+