diff options
author | Mark A. Greer <mgreer@animalcreek.com> | 2014-09-23 23:38:14 (GMT) |
---|---|---|
committer | Samuel Ortiz <sameo@linux.intel.com> | 2014-11-28 11:40:38 (GMT) |
commit | 9b5ec0fd584df424c0541f631b7c1154697bf227 (patch) | |
tree | 69d7d946aae64c29846434d944987da74854f251 /net/nfc/digital_dep.c | |
parent | 384ab1d174a11292af63674a26eaa99864db9b48 (diff) | |
download | linux-9b5ec0fd584df424c0541f631b7c1154697bf227.tar.xz |
NFC: digital: Add NFC-DEP Target-side ATN Support
When an NFC-DEP target receives an ATN PDU, its
supposed to respond with a similar ATN PDU.
When the Target receives an I PDU with the PNI
one less than the current PNI and the last PDU
sent was an ATN PDU, the Target is to resend the
last non-ATN PDU that it has sent. This is
described in section 14.12.3.4 of the NFC Digital
Protocol Spec.
The digital layer's NFC-DEP code doesn't implement
this so add that support.
Reviewed-by: Thierry Escande <thierry.escande@linux.intel.com>
Tested-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'net/nfc/digital_dep.c')
-rw-r--r-- | net/nfc/digital_dep.c | 88 |
1 files changed, 83 insertions, 5 deletions
diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c index 8f1fefd..f72be74 100644 --- a/net/nfc/digital_dep.c +++ b/net/nfc/digital_dep.c @@ -970,6 +970,43 @@ static int digital_tg_send_ack(struct nfc_digital_dev *ddev, return rc; } +static int digital_tg_send_atn(struct nfc_digital_dev *ddev) +{ + struct digital_dep_req_res *dep_res; + struct sk_buff *skb; + int rc; + + skb = digital_skb_alloc(ddev, 1); + if (!skb) + return -ENOMEM; + + skb_push(skb, sizeof(struct digital_dep_req_res)); + + dep_res = (struct digital_dep_req_res *)skb->data; + + dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; + dep_res->cmd = DIGITAL_CMD_DEP_RES; + dep_res->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; + + if (ddev->did) { + dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; + + memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, + sizeof(ddev->did)); + } + + digital_skb_push_dep_sod(ddev, skb); + + ddev->skb_add_crc(skb); + + rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, + NULL); + if (rc) + kfree_skb(skb); + + return rc; +} + static int digital_tg_send_saved_skb(struct nfc_digital_dev *ddev) { skb_get(ddev->saved_skb); @@ -1049,12 +1086,24 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, case DIGITAL_NFC_DEP_PFB_I_PDU: pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); - if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { + if ((ddev->atn_count && (DIGITAL_NFC_DEP_PFB_PNI(pfb - 1) != + ddev->curr_nfc_dep_pni)) || + (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni)) { PROTOCOL_ERR("14.12.3.4"); rc = -EIO; goto exit; } + if (ddev->atn_count) { + ddev->atn_count = 0; + + rc = digital_tg_send_saved_skb(ddev); + if (rc) + goto exit; + + return; + } + kfree_skb(ddev->saved_skb); ddev->saved_skb = NULL; @@ -1077,13 +1126,26 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, break; case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: if (!DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { /* ACK */ - if ((DIGITAL_NFC_DEP_PFB_PNI(pfb) != + if ((ddev->atn_count && + (DIGITAL_NFC_DEP_PFB_PNI(pfb - 1) != + ddev->curr_nfc_dep_pni)) || + (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) || !ddev->chaining_skb || !ddev->saved_skb) { rc = -EIO; goto exit; } + if (ddev->atn_count) { + ddev->atn_count = 0; + + rc = digital_tg_send_saved_skb(ddev); + if (rc) + goto exit; + + return; + } + kfree_skb(ddev->saved_skb); ddev->saved_skb = NULL; @@ -1098,6 +1160,8 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, goto exit; } + ddev->atn_count = 0; + rc = digital_tg_send_saved_skb(ddev); if (rc) { kfree_skb(ddev->saved_skb); @@ -1107,9 +1171,19 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, return; case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: - pr_err("Received a SUPERVISOR PDU\n"); - rc = -EINVAL; - goto exit; + if (DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { + rc = -EINVAL; + goto exit; + } + + rc = digital_tg_send_atn(ddev); + if (rc) + goto exit; + + ddev->atn_count++; + + kfree_skb(resp); + return; } rc = nfc_tm_data_received(ddev->nfc_dev, resp); @@ -1118,6 +1192,8 @@ exit: kfree_skb(ddev->chaining_skb); ddev->chaining_skb = NULL; + ddev->atn_count = 0; + kfree_skb(ddev->saved_skb); ddev->saved_skb = NULL; @@ -1311,6 +1387,8 @@ static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) offset++; + ddev->atn_count = 0; + if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) digital_tg_recv_psl_req(ddev, arg, resp); else |