NFC Digital: Add NFC-F technology support
This adds polling support for NFC-F technology at 212 kbits/s and 424
kbits/s. A user space application like neard can send type 3 tag
commands through the NFC core.
Process flow for NFC-F detection is as follow:
1 - The digital stack sends the SENSF_REQ command to the NFC device.
2 - A peer device replies with a SENSF_RES response.
3 - The digital stack notifies the NFC core of the presence of a
target in the operation field and passes the target NFCID2.
This also adds support for CRC calculation of type CRC-F. The CRC
calculation is handled by the digital stack if the NFC device doesn't
support it.
Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/net/nfc/digital_core.c b/net/nfc/digital_core.c
index 4b3ceb4..25e5bcb 100644
--- a/net/nfc/digital_core.c
+++ b/net/nfc/digital_core.c
@@ -20,6 +20,8 @@
#define DIGITAL_PROTO_NFCA_RF_TECH \
(NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK)
+#define DIGITAL_PROTO_NFCF_RF_TECH (NFC_PROTO_FELICA_MASK)
+
struct digital_cmd {
struct list_head queue;
@@ -252,6 +254,12 @@
add_crc = digital_skb_add_crc_a;
break;
+ case NFC_PROTO_FELICA:
+ framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
+ check_crc = digital_skb_check_crc_f;
+ add_crc = digital_skb_add_crc_f;
+ break;
+
default:
PR_ERR("Invalid protocol %d", protocol);
return -EINVAL;
@@ -383,6 +391,14 @@
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
digital_in_send_sens_req);
+ if (im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
+ digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
+ digital_in_send_sensf_req);
+
+ digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
+ digital_in_send_sensf_req);
+ }
+
if (!ddev->poll_tech_count) {
PR_ERR("Unsupported protocols: im=0x%x, tm=0x%x",
matching_im_protocols, matching_tm_protocols);
@@ -560,6 +576,8 @@
ddev->protocols |= NFC_PROTO_JEWEL_MASK;
if (supported_protocols & NFC_PROTO_MIFARE_MASK)
ddev->protocols |= NFC_PROTO_MIFARE_MASK;
+ if (supported_protocols & NFC_PROTO_FELICA_MASK)
+ ddev->protocols |= NFC_PROTO_FELICA_MASK;
ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;