Userspace gets a netlink event upon target mode activation.
The LLCP layer is also signaled when we get an ATR_REQ in order to get
the remote general bytes.
Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
---
drivers/nfc/pn533.c | 27 +++++++++++++++++++-
include/linux/nfc.h | 7 +++++
include/net/nfc/nfc.h | 4 +++
net/nfc/core.c | 35 +++++++++++++++++++++++++++
net/nfc/netlink.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
net/nfc/nfc.h | 3 ++
6 files changed, 136 insertions(+), 2 deletions(-)
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index 605a08a..c6b9bc5 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -260,6 +260,10 @@ struct pn533_cmd_jump_dep_response {
#define PN533_INIT_TARGET_PASSIVE 0x1
#define PN533_INIT_TARGET_DEP 0x2
+#define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
+#define PN533_INIT_TARGET_RESP_ACTIVE 0x1
+#define PN533_INIT_TARGET_RESP_DEP 0x4
+
struct pn533_cmd_init_target {
u8 mode;
u8 mifare[6];
@@ -1128,10 +1132,13 @@ static int pn533_init_target_frame(struct pn533_frame *frame,
return 0;
}
+#define ATR_REQ_GB_OFFSET 17
static int pn533_init_target_complete(struct pn533 *dev, void *arg,
u8 *params, int params_len)
{
struct pn533_cmd_init_target_response *resp;
+ u8 frame, comm_mode = NFC_COMM_PASSIVE, *gb;
+ size_t gb_len;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
@@ -1143,11 +1150,27 @@ static int pn533_init_target_complete(struct pn533 *dev, void *arg,
return params_len;
}
+ if (params_len < ATR_REQ_GB_OFFSET + 1)
+ return -EINVAL;
+
resp = (struct pn533_cmd_init_target_response *) params;
- nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x\n", resp->mode);
+ nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x param len %d\n",
+ resp->mode, params_len);
- return 0;
+ frame = resp->mode & PN533_INIT_TARGET_RESP_FRAME_MASK;
+ if (frame == PN533_INIT_TARGET_RESP_ACTIVE)
+ comm_mode = NFC_COMM_ACTIVE;
+
+ /* Again, only DEP */
+ if ((resp->mode & PN533_INIT_TARGET_RESP_DEP) == 0)
+ return -EOPNOTSUPP;
+
+ gb = resp->cmd + ATR_REQ_GB_OFFSET;
+ gb_len = params_len - (ATR_REQ_GB_OFFSET + 1);
+
+ return nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
+ comm_mode, gb, gb_len);
}
static int pn533_init_target(struct nfc_dev *nfc_dev, u32 protocols)
diff --git a/include/linux/nfc.h b/include/linux/nfc.h
index 5487158..d124e92 100644
--- a/include/linux/nfc.h
+++ b/include/linux/nfc.h
@@ -56,6 +56,10 @@
* %NFC_ATTR_PROTOCOLS)
* @NFC_EVENT_DEVICE_REMOVED: event emitted when a device is removed
* (it sends %NFC_ATTR_DEVICE_INDEX)
+ * @NFC_EVENT_TM_ACTIVATED: event emitted when the adapter is activated in
+ * target mode.
+ * @NFC_EVENT_DEVICE_DEACTIVATED: event emitted when the adapter is deactivated
+ * from target mode.
*/
enum nfc_commands {
NFC_CMD_UNSPEC,
@@ -71,6 +75,8 @@ enum nfc_commands {
NFC_EVENT_DEVICE_ADDED,
NFC_EVENT_DEVICE_REMOVED,
NFC_EVENT_TARGET_LOST,
+ NFC_EVENT_TM_ACTIVATED,
+ NFC_EVENT_TM_DEACTIVATED,
/* private: internal use only */
__NFC_CMD_AFTER_LAST
};
@@ -122,6 +128,7 @@ enum nfc_attrs {
#define NFC_NFCID1_MAXSIZE 10
#define NFC_SENSB_RES_MAXSIZE 12
#define NFC_SENSF_RES_MAXSIZE 18
+#define NFC_GB_MAXSIZE 48
/* NFC protocols */
#define NFC_PROTO_JEWEL 1
diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h
index 97aa0e8..41573b4b 100644
--- a/include/net/nfc/nfc.h
+++ b/include/net/nfc/nfc.h
@@ -198,4 +198,8 @@ int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
u8 comm_mode, u8 rf_mode);
+int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
+ u8 *gb, size_t gb_len);
+int nfc_tm_deactivated(struct nfc_dev *dev);
+
#endif /* __NET_NFC_H */
diff --git a/net/nfc/core.c b/net/nfc/core.c
index c83717b..17f1474 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -455,6 +455,41 @@ u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
}
EXPORT_SYMBOL(nfc_get_local_general_bytes);
+int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
+ u8 *gb, size_t gb_len)
+{
+ int rc;
+
+ device_lock(&dev->dev);
+
+ dev->polling = false;
+
+ if (gb != NULL) {
+ rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
+ if (rc < 0)
+ goto out;
+ }
+
+ if (protocol == NFC_PROTO_NFC_DEP_MASK)
+ nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
+
+ rc = nfc_genl_tm_activated(dev, protocol);
+
+out:
+ device_unlock(&dev->dev);
+
+ return rc;
+}
+EXPORT_SYMBOL(nfc_tm_activated);
+
+int nfc_tm_deactivated(struct nfc_dev *dev)
+{
+ dev->dep_link_up = false;
+
+ return nfc_genl_tm_deactivated(dev);
+}
+EXPORT_SYMBOL(nfc_tm_deactivated);
+
/**
* nfc_alloc_send_skb - allocate a skb for data exchange responses
*
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index a18fd56..21eaa9b 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -221,6 +221,68 @@ free_msg:
return -EMSGSIZE;
}
+int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
+{
+ struct sk_buff *msg;
+ void *hdr;
+
+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
+ NFC_EVENT_TM_ACTIVATED);
+ if (!hdr)
+ goto free_msg;
+
+ if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
+ goto nla_put_failure;
+ if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
+ goto nla_put_failure;
+
+ genlmsg_end(msg, hdr);
+
+ genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
+
+ return 0;
+
+nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+free_msg:
+ nlmsg_free(msg);
+ return -EMSGSIZE;
+}
+
+int nfc_genl_tm_deactivated(struct nfc_dev *dev)
+{
+ struct sk_buff *msg;
+ void *hdr;
+
+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
+ NFC_EVENT_TM_DEACTIVATED);
+ if (!hdr)
+ goto free_msg;
+
+ if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
+ goto nla_put_failure;
+
+ genlmsg_end(msg, hdr);
+
+ genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
+
+ return 0;
+
+nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+free_msg:
+ nlmsg_free(msg);
+ return -EMSGSIZE;
+}
+
int nfc_genl_device_added(struct nfc_dev *dev)
{
struct sk_buff *msg;
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
index 7d9708f..cd9fcbe 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -128,6 +128,9 @@ int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
u8 comm_mode, u8 rf_mode);
int nfc_genl_dep_link_down_event(struct nfc_dev *dev);
+int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol);
+int nfc_genl_tm_deactivated(struct nfc_dev *dev);
+
struct nfc_dev *nfc_get_device(unsigned int idx);
static inline void nfc_put_device(struct nfc_dev *dev)
--
1.7.9.1
--
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