Commit 93ad4202 authored by Olivier Guiter's avatar Olivier Guiter Committed by Samuel Ortiz
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NFC: pn533: Target mode Tx fragmentation support 



In target mode, when we want to send frames larger than the max length
(PN533_CMD_DATAEXCH_DATA_MAXLEN), we have to split the frame in smaller
chunks and send them, using a specific working queue, with the TgSetMetaData
command. TgSetMetaData sets his own MI bit in the PFB.
The last chunk is sent using the TgSetData command.

Signed-off-by: default avatarOlivier Guiter <olivier.guiter@linux.intel.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 3c13b244

drivers/nfc/pn533.c

+70 −7
Original line number Diff line number Diff line
@@ -150,6 +150,7 @@ MODULE_DEVICE_TABLE(usb, pn533_table); 
#define PN533_CMD_TG_INIT_AS_TARGET 0x8c

#define PN533_CMD_TG_GET_DATA 0x86

#define PN533_CMD_TG_SET_DATA 0x8e

#define PN533_CMD_TG_SET_META_DATA 0x94

#define PN533_CMD_UNDEF 0xff



#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
@@ -374,6 +375,7 @@ struct pn533 { 
	struct work_struct mi_rx_work;

	struct work_struct mi_tx_work;

	struct work_struct mi_tm_rx_work;

	struct work_struct mi_tm_tx_work;

	struct work_struct tg_work;

	struct work_struct rf_work;
@@ -1702,6 +1704,46 @@ static void pn533_wq_tm_mi_recv(struct work_struct *work) 
	return;

}



static int pn533_tm_send_complete(struct pn533 *dev, void *arg,

				  struct sk_buff *resp);

static void pn533_wq_tm_mi_send(struct work_struct *work)

{

	struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);

	struct sk_buff *skb;

	int rc;



	dev_dbg(&dev->interface->dev, "%s\n", __func__);



	/* Grab the first skb in the queue */

	skb = skb_dequeue(&dev->fragment_skb);

	if (skb == NULL) {	/* No more data */

		/* Reset the queue for future use */

		skb_queue_head_init(&dev->fragment_skb);

		goto error;

	}



	/* last entry - remove MI bit */

	if (skb_queue_len(&dev->fragment_skb) == 0) {

		rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,

					skb, pn533_tm_send_complete, NULL);

	} else

		rc = pn533_send_cmd_direct_async(dev,

					PN533_CMD_TG_SET_META_DATA,

					skb, pn533_tm_send_complete, NULL);



	if (rc == 0) /* success */

		return;



	dev_err(&dev->interface->dev,

		"Error %d when trying to perform set meta data_exchange", rc);



	dev_kfree_skb(skb);



error:

	pn533_send_ack(dev, GFP_KERNEL);

	queue_work(dev->wq, &dev->cmd_work);

}



static void pn533_wq_tg_get_data(struct work_struct *work)

{

	struct pn533 *dev = container_of(work, struct pn533, tg_work);
@@ -2668,6 +2710,11 @@ static int pn533_tm_send_complete(struct pn533 *dev, void *arg, 


	status = resp->data[0];



	/* Prepare for the next round */

	if (skb_queue_len(&dev->fragment_skb) > 0) {

		queue_work(dev->wq, &dev->mi_tm_tx_work);

		return -EINPROGRESS;

	}

	dev_kfree_skb(resp);



	if (status != 0) {
@@ -2690,17 +2737,32 @@ static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 


	dev_dbg(&dev->interface->dev, "%s\n", __func__);



	/* let's split in multiple chunks if size's too big */

	if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {

		nfc_err(&dev->interface->dev,

			"Data length greater than the max allowed: %d\n",

			PN533_CMD_DATAEXCH_DATA_MAXLEN);

		return -ENOSYS;

		rc = pn533_fill_fragment_skbs(dev, skb);

		if (rc <= 0)

			goto error;



		/* get the first skb */

		skb = skb_dequeue(&dev->fragment_skb);

		if (!skb) {

			rc = -EIO;

			goto error;

		}



		rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,

						pn533_tm_send_complete, NULL);

	} else {

		/* Send th skb */

		rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,

						pn533_tm_send_complete, NULL);

	if (rc < 0)

	}



error:

	if (rc < 0) {

		dev_kfree_skb(skb);

		skb_queue_purge(&dev->fragment_skb);

	}



	return rc;

}
@@ -3111,6 +3173,7 @@ static int pn533_probe(struct usb_interface *interface, 
	INIT_WORK(&dev->mi_tx_work, pn533_wq_mi_send);

	INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);

	INIT_WORK(&dev->mi_tm_rx_work, pn533_wq_tm_mi_recv);

	INIT_WORK(&dev->mi_tm_tx_work, pn533_wq_tm_mi_send);

	INIT_DELAYED_WORK(&dev->poll_work, pn533_wq_poll);

	INIT_WORK(&dev->rf_work, pn533_wq_rf);

	dev->wq = alloc_ordered_workqueue("pn533", 0);

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