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dca-sysfs.c

#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);
}


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