summaryrefslogtreecommitdiffstats
path: root/drivers/nfc
diff options
context:
space:
mode:
authorSamuel Ortiz <sameo@linux.intel.com>2013-06-26 18:16:21 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2013-08-14 00:35:17 +0200
commit17e9d9d437d1bb52077e562fae9457236dbaa76f (patch)
tree76af676423bbfb4873949ef9ffc911ed6c3093c8 /drivers/nfc
parentf1abed171fa565448d229afb814f66ab6d104d44 (diff)
downloadlinux-17e9d9d437d1bb52077e562fae9457236dbaa76f.tar.bz2
NFC: pn533: Fix the pn533 polling loop
By turning the radio off after each failed polling try, we dramatically improve the pn533 polling loop efficiency. Without this fix, all Android phones running the broadcom NFC stack are almost never detected. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/nfc')
-rw-r--r--drivers/nfc/pn533.c55
1 files changed, 54 insertions, 1 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index 3c169e3fdee1..fe9d4b7b6078 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -359,6 +359,7 @@ struct pn533 {
struct work_struct poll_work;
struct work_struct mi_work;
struct work_struct tg_work;
+ struct work_struct rf_work;
struct list_head cmd_queue;
struct pn533_cmd *cmd;
@@ -1660,6 +1661,53 @@ static void pn533_listen_mode_timer(unsigned long data)
queue_work(dev->wq, &dev->poll_work);
}
+static int pn533_rf_complete(struct pn533 *dev, void *arg,
+ struct sk_buff *resp)
+{
+ int rc = 0;
+
+ nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+ if (IS_ERR(resp)) {
+ rc = PTR_ERR(resp);
+
+ nfc_dev_err(&dev->interface->dev, "%s RF setting error %d",
+ __func__, rc);
+
+ return rc;
+ }
+
+ queue_work(dev->wq, &dev->poll_work);
+
+ dev_kfree_skb(resp);
+ return rc;
+}
+
+static void pn533_wq_rf(struct work_struct *work)
+{
+ struct pn533 *dev = container_of(work, struct pn533, rf_work);
+ struct sk_buff *skb;
+ int rc;
+
+ nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+ skb = pn533_alloc_skb(dev, 2);
+ if (!skb)
+ return;
+
+ *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
+ *skb_put(skb, 1) = 0;
+
+ rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
+ pn533_rf_complete, NULL);
+ if (rc < 0) {
+ dev_kfree_skb(skb);
+ nfc_dev_err(&dev->interface->dev, "RF setting error %d", rc);
+ }
+
+ return;
+}
+
static int pn533_poll_complete(struct pn533 *dev, void *arg,
struct sk_buff *resp)
{
@@ -1705,7 +1753,8 @@ static int pn533_poll_complete(struct pn533 *dev, void *arg,
}
pn533_poll_next_mod(dev);
- queue_work(dev->wq, &dev->poll_work);
+ /* Not target found, turn radio off */
+ queue_work(dev->wq, &dev->rf_work);
done:
dev_kfree_skb(resp);
@@ -2051,6 +2100,7 @@ static int pn533_mod_to_baud(struct pn533 *dev)
}
}
+static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
#define PASSIVE_DATA_LEN 5
static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
u8 comm_mode, u8 *gb, size_t gb_len)
@@ -2127,6 +2177,8 @@ static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
*arg = !comm_mode;
+ pn533_rf_field(dev->nfc_dev, 0);
+
rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
pn533_in_dep_link_up_complete, arg);
@@ -2721,6 +2773,7 @@ static int pn533_probe(struct usb_interface *interface,
INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
INIT_WORK(&dev->poll_work, pn533_wq_poll);
+ INIT_WORK(&dev->rf_work, pn533_wq_rf);
dev->wq = alloc_ordered_workqueue("pn533", 0);
if (dev->wq == NULL)
goto error;