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authorThierry Escande <thierry.escande@linux.intel.com>2013-09-19 19:55:29 +0400
committerSamuel Ortiz <sameo@linux.intel.com>2013-09-25 04:02:27 +0400
commit7d0911c02fa2a448a28d7844d2a0c439ff8397b1 (patch)
treec9638f5b6ebab6323c51037a8e871d6cf91d8efd /net/nfc/digital_technology.c
parent8c0695e4998dd268ff2a05951961247b7e015651 (diff)
downloadlinux-7d0911c02fa2a448a28d7844d2a0c439ff8397b1.tar.xz
NFC Digital: Add initiator NFC-DEP support
This adds support for NFC-DEP protocol in initiator mode for NFC-A and NFC-F technologies. When a target is detected, the process flow is as follow: For NFC-A technology: 1 - The digital stack receives a SEL_RES as the reply of the SEL_REQ command. 2 - If b7 of SEL_RES is set, the peer device is configure for NFC-DEP protocol. NFC core is notified through nfc_targets_found(). Execution continues at step 4. 3 - Otherwise, it's a tag and the NFC core is notified. Detection ends. 4 - The digital stacks sends an ATR_REQ command containing a randomly generated NFCID3 and the general bytes obtained from the LLCP layer of NFC core. For NFC-F technology: 1 - The digital stack receives a SENSF_RES as the reply of the SENSF_REQ command. 2 - If B1 and B2 of NFCID2 are 0x01 and 0xFE respectively, the peer device is configured for NFC-DEP protocol. NFC core is notified through nfc_targets_found(). Execution continues at step 4. 3 - Otherwise it's a type 3 tag. NFC core is notified. Detection ends. 4 - The digital stacks sends an ATR_REQ command containing the NFC-F NFCID2 as NFCID3 and the general bytes obtained from the LLCP layer of NFC core. For both technologies: 5 - The digital stacks receives the ATR_RES response containing the NFCID3 and the general bytes of the peer device. 6 - The digital stack notifies NFC core that the DEP link is up through nfc_dep_link_up(). 7 - The NFC core performs data exchange through tm_transceive(). 8 - The digital stack sends a DEP_REQ command containing an I PDU with the data from NFC core. 9 - The digital stack receives a DEP_RES command 10 - If the DEP_RES response contains a supervisor PDU with timeout extension request (RTOX) the digital stack sends a DEP_REQ command containing a supervisor PDU acknowledging the RTOX request. The execution continues at step 9. 11 - If the DEP_RES response contains an I PDU, the response data is passed back to NFC core through the response callback. The execution continues at step 8. Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'net/nfc/digital_technology.c')
-rw-r--r--net/nfc/digital_technology.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c
index bfe5ae17909e..0c28f600fd1c 100644
--- a/net/nfc/digital_technology.c
+++ b/net/nfc/digital_technology.c
@@ -28,6 +28,7 @@
#define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))
#define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
+#define DIGITAL_SEL_RES_IS_NFC_DEP(sel_res) ((sel_res) & 0x40)
#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x000C) == 0x000C)
#define DIGITAL_SENS_RES_IS_VALID(sens_res) \
@@ -121,6 +122,8 @@ static void digital_in_recv_sel_res(struct nfc_digital_dev *ddev, void *arg,
if (DIGITAL_SEL_RES_IS_T2T(sel_res)) {
nfc_proto = NFC_PROTO_MIFARE;
+ } else if (DIGITAL_SEL_RES_IS_NFC_DEP(sel_res)) {
+ nfc_proto = NFC_PROTO_NFC_DEP;
} else {
rc = -EOPNOTSUPP;
goto exit;
@@ -379,6 +382,7 @@ static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp)
{
int rc;
+ u8 proto;
struct nfc_target target;
struct digital_sensf_res *sensf_res;
@@ -413,7 +417,13 @@ static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg,
memcpy(target.nfcid2, sensf_res->nfcid2, NFC_NFCID2_MAXSIZE);
target.nfcid2_len = NFC_NFCID2_MAXSIZE;
- rc = digital_target_found(ddev, &target, NFC_PROTO_FELICA);
+ if (target.nfcid2[0] == DIGITAL_SENSF_NFCID2_NFC_DEP_B1 &&
+ target.nfcid2[1] == DIGITAL_SENSF_NFCID2_NFC_DEP_B2)
+ proto = NFC_PROTO_NFC_DEP;
+ else
+ proto = NFC_PROTO_FELICA;
+
+ rc = digital_target_found(ddev, &target, proto);
exit:
dev_kfree_skb(resp);