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NFC: pn533: Add delay between each poll frame 

It seems that some pn533 firmwares go belly up when being asked to send
poll frames too frequently. Adding a 10ms delay between each of them
calm the chip down and prevent it from crashing.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2013-07-03 14:50:36 +02:00
parent ac22ac466a
commit 46f793b041
1 changed files with 11 additions and 5 deletions
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16
drivers/nfc/pn533.c
View File

@ -83,6 +83,8 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
/* How much time we spend listening for initiators */
#define PN533_LISTEN_TIME 2
/* Delay between each poll frame (ms) */
#define PN533_POLL_INTERVAL 10
/* Standard pn533 frame definitions (standard and extended)*/
#define PN533_STD_FRAME_HEADER_LEN (sizeof(struct pn533_std_frame) \
@ -368,7 +370,7 @@ struct pn533 {
struct workqueue_struct *wq;
struct work_struct cmd_work;
struct work_struct cmd_complete_work;
struct work_struct poll_work;
struct delayed_work poll_work;
struct work_struct mi_rx_work;
struct work_struct mi_tx_work;
struct work_struct tg_work;
@ -1719,7 +1721,8 @@ static void pn533_listen_mode_timer(unsigned long data)
pn533_poll_next_mod(dev);
queue_work(dev->wq, &dev->poll_work);
queue_delayed_work(dev->wq, &dev->poll_work,
msecs_to_jiffies(PN533_POLL_INTERVAL));
}
static int pn533_rf_complete(struct pn533 *dev, void *arg,
@ -1738,7 +1741,8 @@ static int pn533_rf_complete(struct pn533 *dev, void *arg,
return rc;
}
queue_work(dev->wq, &dev->poll_work);
queue_delayed_work(dev->wq, &dev->poll_work,
msecs_to_jiffies(PN533_POLL_INTERVAL));
dev_kfree_skb(resp);
return rc;
@ -1880,7 +1884,7 @@ static int pn533_send_poll_frame(struct pn533 *dev)
static void pn533_wq_poll(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, poll_work);
struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
struct pn533_poll_modulations *cur_mod;
int rc;
@ -1955,6 +1959,7 @@ static void pn533_stop_poll(struct nfc_dev *nfc_dev)
}
pn533_abort_cmd(dev, GFP_KERNEL);
flush_delayed_work(&dev->poll_work);
pn533_poll_reset_mod_list(dev);
}
@ -2931,7 +2936,7 @@ static int pn533_probe(struct usb_interface *interface,
INIT_WORK(&dev->mi_rx_work, pn533_wq_mi_recv);
INIT_WORK(&dev->mi_tx_work, pn533_wq_mi_send);
INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
INIT_WORK(&dev->poll_work, pn533_wq_poll);
INIT_DELAYED_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)
@ -3044,6 +3049,7 @@ static void pn533_disconnect(struct usb_interface *interface)
usb_kill_urb(dev->in_urb);
usb_kill_urb(dev->out_urb);
flush_delayed_work(&dev->poll_work);
destroy_workqueue(dev->wq);
skb_queue_purge(&dev->resp_q);