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NFC: digital: Fix RTOX supervisor PDU handling

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When the target needs more time to process the received PDU, it sends
Response Timeout Extension (RTOX) PDU.

When the initiator receives a RTOX PDU, it must reply with a RTOX PDU
and extends the current rwt value with the formula:
 rwt_int = rwt * rtox

This patch takes care of the rtox value passed by the target in the RTOX
PDU and extends the timeout for the next response accordingly.

Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Thierry Escande 2016-07-08 15:52:46 +02:00 committed by Samuel Ortiz
parent 1a09c56f54
commit d85a301c26
1 changed files with 24 additions and 2 deletions
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26
net/nfc/digital_dep.c
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@ -65,6 +65,9 @@
#define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT)
#define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
#define DIGITAL_NFC_DEP_RTOX_VALUE(data) ((data) & 0x3F)
#define DIGITAL_NFC_DEP_RTOX_MAX 59
#define DIGITAL_NFC_DEP_PFB_I_PDU 0x00
#define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40
#define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
@ -643,6 +646,11 @@ static int digital_in_send_rtox(struct nfc_digital_dev *ddev,
struct digital_dep_req_res *dep_req;
struct sk_buff *skb;
int rc;
u16 rwt_int;
rwt_int = ddev->dep_rwt * rtox;
if (rwt_int > digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT])
rwt_int = digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT];
skb = digital_skb_alloc(ddev, 1);
if (!skb)
@ -663,7 +671,7 @@ static int digital_in_send_rtox(struct nfc_digital_dev *ddev,
ddev->skb_add_crc(skb);
rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt,
rc = digital_in_send_cmd(ddev, skb, rwt_int,
digital_in_recv_dep_res, data_exch);
if (rc)
kfree_skb(skb);
@ -697,6 +705,7 @@ static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
u8 pfb;
uint size;
int rc;
u8 rtox;
if (IS_ERR(resp)) {
rc = PTR_ERR(resp);
@ -865,7 +874,20 @@ static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
goto free_resp;
}
rc = digital_in_send_rtox(ddev, data_exch, resp->data[0]);
if (ddev->atn_count || ddev->nack_count) {
PROTOCOL_ERR("14.12.4.4");
rc = -EIO;
goto error;
}
rtox = DIGITAL_NFC_DEP_RTOX_VALUE(resp->data[0]);
if (!rtox || rtox > DIGITAL_NFC_DEP_RTOX_MAX) {
PROTOCOL_ERR("14.8.4.1");
rc = -EIO;
goto error;
}
rc = digital_in_send_rtox(ddev, data_exch, rtox);
if (rc)
goto error;