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NFC Digital: Add initiator NFC-DEP support

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This adds support for NFC-DEP protocol in initiator mode for NFC-A and
NFC-F technologies.

When a target is detected, the process flow is as follow:

For NFC-A technology:
1 - The digital stack receives a SEL_RES as the reply of the SEL_REQ
    command.
2   - If b7 of SEL_RES is set, the peer device is configure for NFC-DEP
      protocol. NFC core is notified through nfc_targets_found().
      Execution continues at step 4.
3   - Otherwise, it's a tag and the NFC core is notified. Detection
      ends.
4 - The digital stacks sends an ATR_REQ command containing a randomly
    generated NFCID3 and the general bytes obtained from the LLCP layer
    of NFC core.

For NFC-F technology:
1 - The digital stack receives a SENSF_RES as the reply of the
    SENSF_REQ command.
2   - If B1 and B2 of NFCID2 are 0x01 and 0xFE respectively, the peer
      device is configured for NFC-DEP protocol. NFC core is notified
      through nfc_targets_found(). Execution continues at step 4.
3   - Otherwise it's a type 3 tag. NFC core is notified. Detection
      ends.
4 - The digital stacks sends an ATR_REQ command containing the NFC-F
    NFCID2 as NFCID3 and the general bytes obtained from the LLCP layer
    of NFC core.

For both technologies:
5 - The digital stacks receives the ATR_RES response containing the
    NFCID3 and the general bytes of the peer device.
6 - The digital stack notifies NFC core that the DEP link is up through
    nfc_dep_link_up().
7 - The NFC core performs data exchange through tm_transceive().
8 - The digital stack sends a DEP_REQ command containing an I PDU with
    the data from NFC core.
9 - The digital stack receives a DEP_RES command
10  - If the DEP_RES response contains a supervisor PDU with timeout
      extension request (RTOX) the digital stack sends a DEP_REQ
      command containing a supervisor PDU acknowledging the RTOX
      request. The execution continues at step 9.
11  - If the DEP_RES response contains an I PDU, the response data is
      passed back to NFC core through the response callback. The
      execution continues at step 8.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Thierry Escande 2013-09-19 17:55:29 +02:00 • committed by Samuel Ortiz
parent 8c0695e499
commit 7d0911c02f
5 changed files with 435 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

32
net/nfc/digital_core.c
View file

@ -18,9 +18,10 @@
#include "digital.h"
#define DIGITAL_PROTO_NFCA_RF_TECH \
(NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK)
(NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_NFC_DEP_MASK)
#define DIGITAL_PROTO_NFCF_RF_TECH (NFC_PROTO_FELICA_MASK)
#define DIGITAL_PROTO_NFCF_RF_TECH \
(NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
struct digital_cmd {
struct list_head queue;
@ -260,6 +261,18 @@ int digital_target_found(struct nfc_digital_dev *ddev,
add_crc = digital_skb_add_crc_f;
break;
case NFC_PROTO_NFC_DEP:
if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
check_crc = digital_skb_check_crc_a;
add_crc = digital_skb_add_crc_a;
} else {
framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
check_crc = digital_skb_check_crc_f;
add_crc = digital_skb_add_crc_f;
}
break;
default:
PR_ERR("Invalid protocol %d", protocol);
return -EINVAL;
@ -453,12 +466,18 @@ static int digital_dep_link_up(struct nfc_dev *nfc_dev,
struct nfc_target *target,
__u8 comm_mode, __u8 *gb, size_t gb_len)
{
return -EOPNOTSUPP;
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
return digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
}
static int digital_dep_link_down(struct nfc_dev *nfc_dev)
{
return -EOPNOTSUPP;
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
ddev->curr_protocol = 0;
return 0;
}
static int digital_activate_target(struct nfc_dev *nfc_dev,
@ -523,6 +542,9 @@ static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
data_exch->cb = cb;
data_exch->cb_context = cb_context;
if (ddev->curr_protocol == NFC_PROTO_NFC_DEP)
return digital_in_send_dep_req(ddev, target, skb, data_exch);
ddev->skb_add_crc(skb);
return digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
@ -578,6 +600,8 @@ struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
ddev->protocols |= NFC_PROTO_MIFARE_MASK;
if (supported_protocols & NFC_PROTO_FELICA_MASK)
ddev->protocols |= NFC_PROTO_FELICA_MASK;
if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;