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NFC: Add NCI data exchange timer

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Add NCI data exchange timer to catch timeouts,
and call the data exchange callback with an error.

Signed-off-by: Ilan Elias <ilane@ti.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ilan Elias 2012-01-17 12:03:50 +02:00 committed by John W. Linville
parent 889cbb911a
commit c4bf98b220
3 changed files with 31 additions and 0 deletions
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3
include/net/nfc/nci_core.h
View file

@ -41,6 +41,7 @@ enum {
NCI_DISCOVERY,
NCI_POLL_ACTIVE,
NCI_DATA_EXCHANGE,
NCI_DATA_EXCHANGE_TO,
};
/* NCI timeouts */
@ -49,6 +50,7 @@ enum {
#define NCI_RF_DISC_TIMEOUT 5000
#define NCI_RF_DEACTIVATE_TIMEOUT 30000
#define NCI_CMD_TIMEOUT 5000
#define NCI_DATA_TIMEOUT 700
struct nci_dev;
@ -74,6 +76,7 @@ struct nci_dev {
atomic_t credits_cnt;
struct timer_list cmd_timer;
struct timer_list data_timer;
struct workqueue_struct *cmd_wq;
struct work_struct cmd_work;

24
net/nfc/nci/core.c
View file

@ -286,6 +286,7 @@ static int nci_close_device(struct nci_dev *ndev)
if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
del_timer_sync(&ndev->cmd_timer);
del_timer_sync(&ndev->data_timer);
mutex_unlock(&ndev->req_lock);
return 0;
}
@ -331,6 +332,15 @@ static void nci_cmd_timer(unsigned long arg)
queue_work(ndev->cmd_wq, &ndev->cmd_work);
}
/* NCI data exchange timer function */
static void nci_data_timer(unsigned long arg)
{
struct nci_dev *ndev = (void *) arg;
set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
queue_work(ndev->rx_wq, &ndev->rx_work);
}
static int nci_dev_up(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
@ -585,6 +595,8 @@ int nci_register_device(struct nci_dev *ndev)
setup_timer(&ndev->cmd_timer, nci_cmd_timer,
(unsigned long) ndev);
setup_timer(&ndev->data_timer, nci_data_timer,
(unsigned long) ndev);
mutex_init(&ndev->req_lock);
@ -722,6 +734,9 @@ static void nci_tx_work(struct work_struct *work)
nci_plen(skb->data));
nci_send_frame(skb);
mod_timer(&ndev->data_timer,
jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
}
}
@ -753,6 +768,15 @@ static void nci_rx_work(struct work_struct *work)
break;
}
}
/* check if a data exchange timout has occurred */
if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
/* complete the data exchange transaction, if exists */
if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
}
}
/* ----- NCI TX CMD worker thread ----- */

4
net/nfc/nci/data.c
View file

@ -44,6 +44,10 @@ void nci_data_exchange_complete(struct nci_dev *ndev,
pr_debug("len %d, err %d\n", skb ? skb->len : 0, err);
/* data exchange is complete, stop the data timer */
del_timer_sync(&ndev->data_timer);
clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
if (cb) {
ndev->data_exchange_cb = NULL;
ndev->data_exchange_cb_context = 0;