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NFC: digital: Handle multiple SENSF_REQ frames

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According to section 5.15.1.3 of the NFC Activity
Specification, multiple SENSF_REQ commands can be
received by a target before it receives an ATR_REQ
command.  To handle this, add a routine that checks
whether a SENSF_REQ or ATR_REQ has been recieved.
If its a SENSF_REQ, respond appropriately and
continue waiting for a ATR_REQ.  If its an ATR_REQ,
handle it as before.

CC: 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>
This commit is contained in:
Mark A. Greer 2014-04-23 11:00:56 -07:00 committed by Samuel Ortiz
parent 96e829b433
commit 4b8b6267be
1 changed files with 13 additions and 1 deletions
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14
net/nfc/digital_technology.c
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@ -1091,6 +1091,18 @@ exit:
dev_kfree_skb(resp);
}
static void digital_tg_recv_atr_or_sensf_req(struct nfc_digital_dev *ddev,
void *arg, struct sk_buff *resp)
{
if (!IS_ERR(resp) && (resp->len >= 2) &&
(resp->data[1] == DIGITAL_CMD_SENSF_REQ))
digital_tg_recv_sensf_req(ddev, arg, resp);
else
digital_tg_recv_atr_req(ddev, arg, resp);
return;
}
static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev,
struct digital_sensf_req *sensf_req)
{
@ -1136,7 +1148,7 @@ static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev,
digital_skb_add_crc_f(skb);
rc = digital_tg_send_cmd(ddev, skb, 300,
digital_tg_recv_atr_req, NULL);
digital_tg_recv_atr_or_sensf_req, NULL);
if (rc)
kfree_skb(skb);