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NFC: nfcmrvl: add support of HCI-based transport 

In some configuration NCI packet can be encapsulated in HCI
packets. This patch had the support of this.

Signed-off-by: Vincent Cuissard <cuissard@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Vincent Cuissard 2015-06-11 11:25:43 +02:00 committed by Samuel Ortiz
parent d18ee5a5b0
commit f1f1a7da2b
3 changed files with 52 additions and 4 deletions
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35
drivers/nfc/nfcmrvl/main.c
View File

@ -63,6 +63,17 @@ static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
if (!test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
return -EBUSY;
if (priv->hci_muxed) {
unsigned char *hdr;
unsigned char len = skb->len;
hdr = (char *) skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
hdr[1] = NFCMRVL_HCI_OGF;
hdr[2] = NFCMRVL_HCI_OCF;
hdr[3] = len;
}
return priv->if_ops->nci_send(priv, skb);
}
@ -80,10 +91,12 @@ static struct nci_ops nfcmrvl_nci_ops = {
struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
struct nfcmrvl_if_ops *ops,
struct device *dev)
struct device *dev,
unsigned int flags)
{
struct nfcmrvl_private *priv;
int rc;
int headroom = 0;
u32 protocols;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@ -93,6 +106,10 @@ struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
priv->drv_data = drv_data;
priv->if_ops = ops;
priv->dev = dev;
priv->hci_muxed = (flags & NFCMRVL_DEV_FLAG_HCI_MUXED) ? 1 : 0;
if (priv->hci_muxed)
headroom = NFCMRVL_HCI_EVENT_HEADER_SIZE;
protocols = NFC_PROTO_JEWEL_MASK
| NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
@ -100,7 +117,8 @@ struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
| NFC_PROTO_ISO14443_B_MASK
| NFC_PROTO_NFC_DEP_MASK;
priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols, 0, 0);
priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
headroom, 0);
if (!priv->ndev) {
nfc_err(dev, "nci_allocate_device failed\n");
rc = -ENOMEM;
@ -144,6 +162,19 @@ int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, void *data, int count)
return -ENOMEM;
memcpy(skb_put(skb, count), data, count);
if (priv->hci_muxed) {
if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
/* Data packet, let's extract NCI payload */
skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
} else {
/* Skip this packet */
kfree_skb(skb);
return 0;
}
}
nci_recv_frame(priv->ndev, skb);
return count;

19
drivers/nfc/nfcmrvl/nfcmrvl.h
View File

@ -27,7 +27,23 @@
#define NFCMRVL_GPIO_PIN_NFC_ACTIVE 0xB
#define NFCMRVL_NCI_MAX_EVENT_SIZE 260
/*
** HCI defines
*/
#define NFCMRVL_HCI_EVENT_HEADER_SIZE 0x04
#define NFCMRVL_HCI_EVENT_CODE 0x04
#define NFCMRVL_HCI_NFC_EVENT_CODE 0xFF
#define NFCMRVL_HCI_COMMAND_CODE 0x01
#define NFCMRVL_HCI_OGF 0x81
#define NFCMRVL_HCI_OCF 0xFE
#define NFCMRVL_DEV_FLAG_HCI_MUXED (1 << 0)
struct nfcmrvl_private {
/* Tell if NCI packets are encapsulated in HCI ones */
int hci_muxed;
struct nci_dev *ndev;
unsigned long flags;
void *drv_data;
@ -45,4 +61,5 @@ void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv);
int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, void *data, int count);
struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
struct nfcmrvl_if_ops *ops,
struct device *dev);
struct device *dev,
unsigned int flags);

2
drivers/nfc/nfcmrvl/usb.c
View File

@ -329,7 +329,7 @@ static int nfcmrvl_probe(struct usb_interface *intf,
init_usb_anchor(&drv_data->deferred);
priv = nfcmrvl_nci_register_dev(drv_data, &usb_ops,
&drv_data->udev->dev);
&drv_data->udev->dev, 0);
if (IS_ERR(priv))
return PTR_ERR(priv);