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NFC: digital: Add Digital Layer support for ISO/IEC 15693

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Add support for ISO/IEC 15693 to the digital layer.  The code
currently uses single-slot anticollision only since the digital
layer infrastructure only supports one tag per adapter (making
it pointless to do 16-slot anticollision).

The code uses two new framing types:
'NFC_DIGITAL_FRAMING_ISO15693_INVENTORY' and
'NFC_DIGITAL_FRAMING_ISO15693_TVT'.  The former is used to
tell the driver to prepare for an Inventory command and the
ensuing anticollision sequence.  The latter is used to tell
the driver that the anticollision sequence is over and to
prepare for non-inventory commands.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark A. Greer 2014-01-21 16:23:59 -07:00 • committed by Samuel Ortiz
parent e487e4dc2e
commit a381d48286
3 changed files with 124 additions and 0 deletions
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14
net/nfc/digital_core.c
View file

@ -25,6 +25,8 @@
#define DIGITAL_PROTO_NFCF_RF_TECH \
(NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
struct digital_cmd {
struct list_head queue;
@ -331,6 +333,12 @@ int digital_target_found(struct nfc_digital_dev *ddev,
}
break;
case NFC_PROTO_ISO15693:
framing = NFC_DIGITAL_FRAMING_ISO15693_TVT;
check_crc = digital_skb_check_crc_b;
add_crc = digital_skb_add_crc_b;
break;
default:
pr_err("Invalid protocol %d\n", protocol);
return -EINVAL;
@ -469,6 +477,10 @@ static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
digital_in_send_sensf_req);
}
if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
digital_in_send_iso15693_inv_req);
if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
if (ddev->ops->tg_listen_mdaa) {
digital_add_poll_tech(ddev, 0,
@ -700,6 +712,8 @@ struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
ddev->protocols |= NFC_PROTO_FELICA_MASK;
if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
if (supported_protocols & NFC_PROTO_ISO15693_MASK)
ddev->protocols |= NFC_PROTO_ISO15693_MASK;
ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;