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NFC: add nfc generic netlink interface

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The NFC generic netlink interface exports the NFC control operations
to the user space.

Signed-off-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Signed-off-by: Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Lauro Ramos Venancio
2011-07-01 19:31:34 -03:00
committed by John W. Linville
parent 3e256b8f8d
commit 4d12b8b129
6 changed files with 773 additions and 3 deletions
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93
net/nfc/core.c
View File

@ -233,12 +233,60 @@ struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp)
}
EXPORT_SYMBOL(nfc_alloc_skb);
/**
* nfc_targets_found - inform that targets were found
*
* @dev: The nfc device that found the targets
* @targets: array of nfc targets found
* @ntargets: targets array size
*
* The device driver must call this function when one or many nfc targets
* are found. After calling this function, the device driver must stop
* polling for targets.
*/
int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
int n_targets)
{
int i;
nfc_dbg("dev_name=%s n_targets=%d", dev_name(&dev->dev), n_targets);
dev->polling = false;
for (i = 0; i < n_targets; i++)
targets[i].idx = dev->target_idx++;
spin_lock_bh(&dev->targets_lock);
dev->targets_generation++;
kfree(dev->targets);
dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
GFP_ATOMIC);
if (!dev->targets) {
dev->n_targets = 0;
spin_unlock_bh(&dev->targets_lock);
return -ENOMEM;
}
dev->n_targets = n_targets;
spin_unlock_bh(&dev->targets_lock);
nfc_genl_targets_found(dev);
return 0;
}
EXPORT_SYMBOL(nfc_targets_found);
static void nfc_release(struct device *d)
{
struct nfc_dev *dev = to_nfc_dev(d);
nfc_dbg("dev_name=%s", dev_name(&dev->dev));
nfc_genl_data_exit(&dev->genl_data);
kfree(dev->targets);
kfree(dev);
}
@ -298,6 +346,12 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
dev->ops = ops;
dev->supported_protocols = supported_protocols;
spin_lock_init(&dev->targets_lock);
nfc_genl_data_init(&dev->genl_data);
/* first generation must not be 0 */
dev->targets_generation = 1;
return dev;
}
EXPORT_SYMBOL(nfc_allocate_device);
@ -318,7 +372,16 @@ int nfc_register_device(struct nfc_dev *dev)
rc = device_add(&dev->dev);
mutex_unlock(&nfc_devlist_mutex);
return rc;
if (rc < 0)
return rc;
rc = nfc_genl_device_added(dev);
if (rc)
nfc_dbg("The userspace won't be notified that the device %s was"
" added", dev_name(&dev->dev));
return 0;
}
EXPORT_SYMBOL(nfc_register_device);
@ -329,6 +392,8 @@ EXPORT_SYMBOL(nfc_register_device);
*/
void nfc_unregister_device(struct nfc_dev *dev)
{
int rc;
nfc_dbg("dev_name=%s", dev_name(&dev->dev));
mutex_lock(&nfc_devlist_mutex);
@ -341,18 +406,42 @@ void nfc_unregister_device(struct nfc_dev *dev)
device_unlock(&dev->dev);
mutex_unlock(&nfc_devlist_mutex);
rc = nfc_genl_device_removed(dev);
if (rc)
nfc_dbg("The userspace won't be notified that the device %s"
" was removed", dev_name(&dev->dev));
}
EXPORT_SYMBOL(nfc_unregister_device);
static int __init nfc_init(void)
{
int rc;
nfc_info("NFC Core ver %s", VERSION);
return class_register(&nfc_class);
rc = class_register(&nfc_class);
if (rc)
return rc;
rc = nfc_genl_init();
if (rc)
goto err_genl;
/* the first generation must not be 0 */
nfc_devlist_generation = 1;
return 0;
err_genl:
class_unregister(&nfc_class);
return rc;
}
static void __exit nfc_exit(void)
{
nfc_genl_exit();
class_unregister(&nfc_class);
}