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authorThierry Escande <thierry.escande@collabora.com>2016-06-07 16:21:52 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2016-07-04 12:26:27 +0200
commit7854a44526de84142e367f08288c9f3a33c4c8ee (patch)
treebb06beaf8e3ff9803d4018bd2c41bd209b645fcb
parenta81ba50a89930a96e34862cf236b4f4461e741ae (diff)
NFC: digital: Add a delay between poll cycles
This replaces the polling work struct with a delayed work struct and add a 10 ms delay between 2 poll cycles. This avoids to flood the device with 'switch off'/'switch on' commands. Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r--include/net/nfc/digital.h2
-rw-r--r--net/nfc/digital_core.c16
2 files changed, 11 insertions, 7 deletions
diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h
index 0ae101e..506e3f6 100644
--- a/include/net/nfc/digital.h
+++ b/include/net/nfc/digital.h
@@ -220,7 +220,7 @@ struct nfc_digital_dev {
struct list_head cmd_queue;
struct mutex cmd_lock;
- struct work_struct poll_work;
+ struct delayed_work poll_work;
u8 curr_protocol;
u8 curr_rf_tech;
diff --git a/net/nfc/digital_core.c b/net/nfc/digital_core.c
index dd9003f..27769ac 100644
--- a/net/nfc/digital_core.c
+++ b/net/nfc/digital_core.c
@@ -30,6 +30,9 @@
#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
+/* Delay between each poll frame (ms) */
+#define DIGITAL_POLL_INTERVAL 10
+
struct digital_cmd {
struct list_head queue;
@@ -419,7 +422,8 @@ void digital_poll_next_tech(struct nfc_digital_dev *ddev)
mutex_unlock(&ddev->poll_lock);
- schedule_work(&ddev->poll_work);
+ schedule_delayed_work(&ddev->poll_work,
+ msecs_to_jiffies(DIGITAL_POLL_INTERVAL));
}
static void digital_wq_poll(struct work_struct *work)
@@ -428,7 +432,7 @@ static void digital_wq_poll(struct work_struct *work)
struct digital_poll_tech *poll_tech;
struct nfc_digital_dev *ddev = container_of(work,
struct nfc_digital_dev,
- poll_work);
+ poll_work.work);
mutex_lock(&ddev->poll_lock);
if (!ddev->poll_tech_count) {
@@ -543,7 +547,7 @@ static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
return -EINVAL;
}
- schedule_work(&ddev->poll_work);
+ schedule_delayed_work(&ddev->poll_work, 0);
return 0;
}
@@ -564,7 +568,7 @@ static void digital_stop_poll(struct nfc_dev *nfc_dev)
mutex_unlock(&ddev->poll_lock);
- cancel_work_sync(&ddev->poll_work);
+ cancel_delayed_work_sync(&ddev->poll_work);
digital_abort_cmd(ddev);
}
@@ -770,7 +774,7 @@ struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
mutex_init(&ddev->poll_lock);
- INIT_WORK(&ddev->poll_work, digital_wq_poll);
+ INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll);
if (supported_protocols & NFC_PROTO_JEWEL_MASK)
ddev->protocols |= NFC_PROTO_JEWEL_MASK;
@@ -832,7 +836,7 @@ void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
ddev->poll_tech_count = 0;
mutex_unlock(&ddev->poll_lock);
- cancel_work_sync(&ddev->poll_work);
+ cancel_delayed_work_sync(&ddev->poll_work);
cancel_work_sync(&ddev->cmd_work);
cancel_work_sync(&ddev->cmd_complete_work);