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authorEric Lapuyade <eric.lapuyade@intel.com>2012-04-10 19:43:12 +0200
committerJohn W. Linville <linville@tuxdriver.com>2012-04-12 15:10:39 -0400
commitc8d56ae78653c02fc6e6f304a18f860302481c2d (patch)
treec60fce9156d96a746e809302ebeb1eab86e73f25 /net/nfc
parent144612cacc0b5c230f0b3aebc3a3a53854c332ee (diff)
downloadlinux-c8d56ae78653c02fc6e6f304a18f860302481c2d.tar.bz2
NFC: Add Core support to generate tag lost event
Some HW/drivers get notifications when a tag moves out of the radio field. This notification is now forwarded to user space through netlink. Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/core.c72
1 files changed, 71 insertions, 1 deletions
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 44a701806ba5..da353275fbc6 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -33,6 +33,8 @@
#define VERSION "0.1"
+#define NFC_CHECK_PRES_FREQ_MS 2000
+
int nfc_devlist_generation;
DEFINE_MUTEX(nfc_devlist_mutex);
@@ -292,9 +294,14 @@ int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
}
rc = dev->ops->activate_target(dev, target_idx, protocol);
- if (!rc)
+ if (!rc) {
dev->activated_target_idx = target_idx;
+ if (dev->ops->check_presence)
+ mod_timer(&dev->check_pres_timer, jiffies +
+ msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
+ }
+
error:
device_unlock(&dev->dev);
return rc;
@@ -320,6 +327,9 @@ int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx)
goto error;
}
+ if (dev->ops->check_presence)
+ del_timer_sync(&dev->check_pres_timer);
+
dev->ops->deactivate_target(dev, target_idx);
dev->activated_target_idx = NFC_TARGET_IDX_NONE;
@@ -367,8 +377,15 @@ int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
goto error;
}
+ if (dev->ops->check_presence)
+ del_timer_sync(&dev->check_pres_timer);
+
rc = dev->ops->data_exchange(dev, target_idx, skb, cb, cb_context);
+ if (!rc && dev->ops->check_presence)
+ mod_timer(&dev->check_pres_timer, jiffies +
+ msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
+
error:
device_unlock(&dev->dev);
return rc;
@@ -521,11 +538,46 @@ static void nfc_release(struct device *d)
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+ if (dev->ops->check_presence) {
+ del_timer_sync(&dev->check_pres_timer);
+ destroy_workqueue(dev->check_pres_wq);
+ }
+
nfc_genl_data_exit(&dev->genl_data);
kfree(dev->targets);
kfree(dev);
}
+static void nfc_check_pres_work(struct work_struct *work)
+{
+ struct nfc_dev *dev = container_of(work, struct nfc_dev,
+ check_pres_work);
+ int rc;
+
+ device_lock(&dev->dev);
+
+ if (dev->activated_target_idx != NFC_TARGET_IDX_NONE &&
+ timer_pending(&dev->check_pres_timer) == 0) {
+ rc = dev->ops->check_presence(dev, dev->activated_target_idx);
+ if (!rc) {
+ mod_timer(&dev->check_pres_timer, jiffies +
+ msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
+ } else {
+ nfc_target_lost(dev, dev->activated_target_idx);
+ dev->activated_target_idx = NFC_TARGET_IDX_NONE;
+ }
+ }
+
+ device_unlock(&dev->dev);
+}
+
+static void nfc_check_pres_timeout(unsigned long data)
+{
+ struct nfc_dev *dev = (struct nfc_dev *)data;
+
+ queue_work(dev->check_pres_wq, &dev->check_pres_work);
+}
+
struct class nfc_class = {
.name = "nfc",
.dev_release = nfc_release,
@@ -593,6 +645,24 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
dev->activated_target_idx = NFC_TARGET_IDX_NONE;
+ if (ops->check_presence) {
+ char name[32];
+ init_timer(&dev->check_pres_timer);
+ dev->check_pres_timer.data = (unsigned long)dev;
+ dev->check_pres_timer.function = nfc_check_pres_timeout;
+
+ INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
+ snprintf(name, sizeof(name), "nfc%d_check_pres_wq", dev->idx);
+ dev->check_pres_wq = alloc_workqueue(name, WQ_NON_REENTRANT |
+ WQ_UNBOUND |
+ WQ_MEM_RECLAIM, 1);
+ if (dev->check_pres_wq == NULL) {
+ kfree(dev);
+ return NULL;
+ }
+ }
+
+
return dev;
}
EXPORT_SYMBOL(nfc_allocate_device);