linux-kernel - [RFC 1/4] NFC: pn533: Send ATR_REQ only if NFC_PROTO_NFC_DEP bit is set in poll

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Date:	Fri, 25 Mar 2016 15:46:51 +0100
From:	Michael Thalmeier <michael.thalmeier@...e.at>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
	Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>
Cc:	linux-kernel@...r.kernel.org, linux-nfc@...ts.01.org,
	michael@...lmeier.at
Subject: [RFC 1/4] NFC: pn533: Send ATR_REQ only if NFC_PROTO_NFC_DEP bit is set in poll_protocols

Currently it is not possible to only poll for passive targets with the pn533
driver. To change this ATR_REQ is only sent when NFC_PROTO_NFC_DEP is
explicitly requested in poll_protocols.
As most implementations (e.g. neard) poll for all protocols that are reported
to be supported by the adapter, this should not have much of an effect for
current implementations.

Signed-off-by: Michael Thalmeier <michael.thalmeier@...e.at>
---
 drivers/nfc/pn533.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index bb3d5ea..a85830f 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -1540,7 +1540,8 @@ static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
 	int rc, tgdata_len;
 
 	/* Toggle the DEP polling */
-	dev->poll_dep = 1;
+	if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
+		dev->poll_dep = 1;
 
 	nbtg = resp->data[0];
 	tg = resp->data[1];
@@ -2054,7 +2055,7 @@ static int pn533_send_poll_frame(struct pn533 *dev)
 	dev_dbg(&dev->interface->dev, "%s mod len %d\n",
 		__func__, mod->len);
 
-	if (dev->poll_dep)  {
+	if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
 		dev->poll_dep = 0;
 		return pn533_poll_dep(dev->nfc_dev);
 	}
-- 
2.5.5