From c531c9ec2969860c98a8a47f501c4874278388d3 Mon Sep 17 00:00:00 2001
From: Samuel Ortiz <sameo@linux.intel.com>
Date: Fri, 10 May 2013 16:15:32 +0200
Subject: [PATCH] NFC: Add secure element enablement internal API
Called via netlink, this API will enable or disable a specific secure
element. When a secure element is enabled, it will handle card emulation
and more generically ISO-DEP target mode, i.e. all target mode cases
except for p2p target mode.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
---
net/nfc/core.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++--
net/nfc/nfc.h | 3 ++
2 files changed, 109 insertions(+), 4 deletions(-)
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 5b60b9ddfc8f..dc96a83aa6ab 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -528,6 +528,108 @@ error:
return rc;
}
+static struct nfc_se *find_se(struct nfc_dev *dev, u32 se_idx)
+{
+ struct nfc_se *se, *n;
+
+ list_for_each_entry_safe(se, n, &dev->secure_elements, list)
+ if (se->idx == se_idx)
+ return se;
+
+ return NULL;
+}
+
+int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
+{
+
+ struct nfc_se *se;
+ int rc;
+
+ pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->dev_up) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->polling) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ if (!dev->ops->enable_se || !dev->ops->disable_se) {
+ rc = -EOPNOTSUPP;
+ goto error;
+ }
+
+ se = find_se(dev, se_idx);
+ if (!se) {
+ rc = -EINVAL;
+ goto error;
+ }
+
+ if (se->type == NFC_SE_ENABLED) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ rc = dev->ops->enable_se(dev, se_idx);
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
+{
+
+ struct nfc_se *se;
+ int rc;
+
+ pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->dev_up) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->ops->enable_se || !dev->ops->disable_se) {
+ rc = -EOPNOTSUPP;
+ goto error;
+ }
+
+ se = find_se(dev, se_idx);
+ if (!se) {
+ rc = -EINVAL;
+ goto error;
+ }
+
+ if (se->type == NFC_SE_DISABLED) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ rc = dev->ops->disable_se(dev, se_idx);
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
{
pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
@@ -762,14 +864,14 @@ EXPORT_SYMBOL(nfc_driver_failure);
int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
{
- struct nfc_se *se, *n;
+ struct nfc_se *se;
int rc;
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
- list_for_each_entry_safe(se, n, &dev->secure_elements, list)
- if (se->idx == se_idx)
- return -EALREADY;
+ se = find_se(dev, se_idx);
+ if (se)
+ return -EALREADY;
se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
if (!se)
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
index a6aeee094aa4..ee85a1fc1b24 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -147,4 +147,7 @@ int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx);
int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
data_exchange_cb_t cb, void *cb_context);
+int nfc_enable_se(struct nfc_dev *dev, u32 se_idx);
+int nfc_disable_se(struct nfc_dev *dev, u32 se_idx);
+
#endif /* __LOCAL_NFC_H */
--
2.20.1