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path: root/drivers/nfc/pn533.c
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Diffstat (limited to 'drivers/nfc/pn533.c')
-rw-r--r--drivers/nfc/pn533.c35
1 files changed, 21 insertions, 14 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index 697f154331ed..22efb6a672c4 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -1113,6 +1113,23 @@ static void pn533_send_complete(struct urb *urb)
}
}
+static void pn533_abort_cmd(struct pn533 *dev, gfp_t flags)
+{
+ /* ACR122U does not support any command which aborts last
+ * issued command i.e. as ACK for standard PN533. Additionally,
+ * it behaves stange, sending broken or incorrect responses,
+ * when we cancel urb before the chip will send response.
+ */
+ if (dev->device_type == PN533_DEVICE_ACR122U)
+ return;
+
+ /* An ack will cancel the last issued command */
+ pn533_send_ack(dev, flags);
+
+ /* cancel the urb request */
+ usb_kill_urb(dev->in_urb);
+}
+
static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
{
struct sk_buff *skb;
@@ -1631,9 +1648,6 @@ static void pn533_listen_mode_timer(unsigned long data)
nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
- /* An ack will cancel the last issued command (poll) */
- pn533_send_ack(dev, GFP_ATOMIC);
-
dev->cancel_listen = 1;
pn533_poll_next_mod(dev);
@@ -1763,7 +1777,7 @@ static void pn533_wq_poll(struct work_struct *work)
if (dev->cancel_listen == 1) {
dev->cancel_listen = 0;
- usb_kill_urb(dev->in_urb);
+ pn533_abort_cmd(dev, GFP_ATOMIC);
}
rc = pn533_send_poll_frame(dev);
@@ -1825,12 +1839,7 @@ static void pn533_stop_poll(struct nfc_dev *nfc_dev)
return;
}
- /* An ack will cancel the last issued command (poll) */
- pn533_send_ack(dev, GFP_KERNEL);
-
- /* prevent pn533_start_poll_complete to issue a new poll meanwhile */
- usb_kill_urb(dev->in_urb);
-
+ pn533_abort_cmd(dev, GFP_KERNEL);
pn533_poll_reset_mod_list(dev);
}
@@ -2123,10 +2132,8 @@ static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
pn533_poll_reset_mod_list(dev);
- if (dev->tgt_mode || dev->tgt_active_prot) {
- pn533_send_ack(dev, GFP_KERNEL);
- usb_kill_urb(dev->in_urb);
- }
+ if (dev->tgt_mode || dev->tgt_active_prot)
+ pn533_abort_cmd(dev, GFP_KERNEL);
dev->tgt_active_prot = 0;
dev->tgt_mode = 0;