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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>
This commit is contained in:
Thierry Escande 2016-06-07 16:21:52 +02:00 committed by Samuel Ortiz
parent a81ba50a89
commit 7854a44526
2 changed files with 11 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/nfc/digital.h
View File

@ -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;

16
net/nfc/digital_core.c
View File

@ -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);