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authorThierry Escande <thierry.escande@linux.intel.com>2013-09-19 17:55:28 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2013-09-25 02:02:25 +0200
commit8c0695e4998dd268ff2a05951961247b7e015651 (patch)
tree86087518d7435dbe788647ee04be2b460bab0ee8 /net/nfc
parent2c66daecc4092e6049673c281b2e6f0d5e59a94c (diff)
NFC Digital: Add NFC-F technology support
This adds polling support for NFC-F technology at 212 kbits/s and 424 kbits/s. A user space application like neard can send type 3 tag commands through the NFC core. Process flow for NFC-F detection is as follow: 1 - The digital stack sends the SENSF_REQ command to the NFC device. 2 - A peer device replies with a SENSF_RES response. 3 - The digital stack notifies the NFC core of the presence of a target in the operation field and passes the target NFCID2. This also adds support for CRC calculation of type CRC-F. The CRC calculation is handled by the digital stack if the NFC device doesn't support it. Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/Kconfig1
-rw-r--r--net/nfc/digital.h13
-rw-r--r--net/nfc/digital_core.c18
-rw-r--r--net/nfc/digital_technology.c121
4 files changed, 153 insertions, 0 deletions
diff --git a/net/nfc/Kconfig b/net/nfc/Kconfig
index 4f4d2481325a..6e0fa0cce198 100644
--- a/net/nfc/Kconfig
+++ b/net/nfc/Kconfig
@@ -17,6 +17,7 @@ menuconfig NFC
config NFC_DIGITAL
depends on NFC
select CRC_CCITT
+ select CRC_ITU_T
tristate "NFC Digital Protocol stack support"
default n
help
diff --git a/net/nfc/digital.h b/net/nfc/digital.h
index fb5324b792de..85bc74c988f8 100644
--- a/net/nfc/digital.h
+++ b/net/nfc/digital.h
@@ -20,6 +20,7 @@
#include <net/nfc/digital.h>
#include <linux/crc-ccitt.h>
+#include <linux/crc-itu-t.h>
#define PR_DBG(fmt, ...) pr_debug("%s: " fmt "\n", __func__, ##__VA_ARGS__)
#define PR_ERR(fmt, ...) pr_err("%s: " fmt "\n", __func__, ##__VA_ARGS__)
@@ -64,6 +65,7 @@ static inline int digital_in_send_cmd(struct nfc_digital_dev *ddev,
void digital_poll_next_tech(struct nfc_digital_dev *ddev);
int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
+int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech);
int digital_target_found(struct nfc_digital_dev *ddev,
struct nfc_target *target, u8 protocol);
@@ -74,6 +76,7 @@ typedef u16 (*crc_func_t)(u16, const u8 *, size_t);
#define CRC_A_INIT 0x6363
#define CRC_B_INIT 0xFFFF
+#define CRC_F_INIT 0x0000
void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
u8 bitwise_inv, u8 msb_first);
@@ -88,6 +91,11 @@ static inline void digital_skb_add_crc_b(struct sk_buff *skb)
digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
}
+static inline void digital_skb_add_crc_f(struct sk_buff *skb)
+{
+ digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
+}
+
static inline void digital_skb_add_crc_none(struct sk_buff *skb)
{
return;
@@ -106,6 +114,11 @@ static inline int digital_skb_check_crc_b(struct sk_buff *skb)
return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
}
+static inline int digital_skb_check_crc_f(struct sk_buff *skb)
+{
+ return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
+}
+
static inline int digital_skb_check_crc_none(struct sk_buff *skb)
{
return 0;
diff --git a/net/nfc/digital_core.c b/net/nfc/digital_core.c
index 4b3ceb45834b..25e5bcb946e0 100644
--- a/net/nfc/digital_core.c
+++ b/net/nfc/digital_core.c
@@ -20,6 +20,8 @@
#define DIGITAL_PROTO_NFCA_RF_TECH \
(NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK)
+#define DIGITAL_PROTO_NFCF_RF_TECH (NFC_PROTO_FELICA_MASK)
+
struct digital_cmd {
struct list_head queue;
@@ -252,6 +254,12 @@ int digital_target_found(struct nfc_digital_dev *ddev,
add_crc = digital_skb_add_crc_a;
break;
+ case NFC_PROTO_FELICA:
+ framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
+ check_crc = digital_skb_check_crc_f;
+ add_crc = digital_skb_add_crc_f;
+ break;
+
default:
PR_ERR("Invalid protocol %d", protocol);
return -EINVAL;
@@ -383,6 +391,14 @@ static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
digital_in_send_sens_req);
+ if (im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
+ digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
+ digital_in_send_sensf_req);
+
+ digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
+ digital_in_send_sensf_req);
+ }
+
if (!ddev->poll_tech_count) {
PR_ERR("Unsupported protocols: im=0x%x, tm=0x%x",
matching_im_protocols, matching_tm_protocols);
@@ -560,6 +576,8 @@ struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
ddev->protocols |= NFC_PROTO_JEWEL_MASK;
if (supported_protocols & NFC_PROTO_MIFARE_MASK)
ddev->protocols |= NFC_PROTO_MIFARE_MASK;
+ if (supported_protocols & NFC_PROTO_FELICA_MASK)
+ ddev->protocols |= NFC_PROTO_FELICA_MASK;
ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c
index 0cad38001c5f..bfe5ae17909e 100644
--- a/net/nfc/digital_technology.c
+++ b/net/nfc/digital_technology.c
@@ -37,6 +37,17 @@
#define DIGITAL_MIFARE_READ_RES_LEN 16
#define DIGITAL_MIFARE_ACK_RES 0x0A
+#define DIGITAL_CMD_SENSF_REQ 0x00
+#define DIGITAL_CMD_SENSF_RES 0x01
+
+#define DIGITAL_SENSF_RES_MIN_LENGTH 17
+#define DIGITAL_SENSF_RES_RD_AP_B1 0x00
+#define DIGITAL_SENSF_RES_RD_AP_B2 0x8F
+
+#define DIGITAL_SENSF_REQ_RC_NONE 0
+#define DIGITAL_SENSF_REQ_RC_SC 1
+#define DIGITAL_SENSF_REQ_RC_AP 2
+
struct digital_sdd_res {
u8 nfcid1[4];
u8 bcc;
@@ -49,6 +60,25 @@ struct digital_sel_req {
u8 bcc;
} __packed;
+struct digital_sensf_req {
+ u8 cmd;
+ u8 sc1;
+ u8 sc2;
+ u8 rc;
+ u8 tsn;
+} __packed;
+
+struct digital_sensf_res {
+ u8 cmd;
+ u8 nfcid2[8];
+ u8 pad0[2];
+ u8 pad1[3];
+ u8 mrti_check;
+ u8 mrti_update;
+ u8 pad2;
+ u8 rd[2];
+} __packed;
+
static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
struct nfc_target *target);
@@ -344,3 +374,94 @@ int digital_in_recv_mifare_res(struct sk_buff *resp)
/* NACK and any other responses are treated as error. */
return -EIO;
}
+
+static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg,
+ struct sk_buff *resp)
+{
+ int rc;
+ struct nfc_target target;
+ struct digital_sensf_res *sensf_res;
+
+ if (IS_ERR(resp)) {
+ rc = PTR_ERR(resp);
+ resp = NULL;
+ goto exit;
+ }
+
+ if (resp->len < DIGITAL_SENSF_RES_MIN_LENGTH) {
+ rc = -EIO;
+ goto exit;
+ }
+
+ if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
+ rc = digital_skb_check_crc_f(resp);
+ if (rc) {
+ PROTOCOL_ERR("6.4.1.8");
+ goto exit;
+ }
+ }
+
+ skb_pull(resp, 1);
+
+ memset(&target, 0, sizeof(struct nfc_target));
+
+ sensf_res = (struct digital_sensf_res *)resp->data;
+
+ memcpy(target.sensf_res, sensf_res, resp->len);
+ target.sensf_res_len = resp->len;
+
+ memcpy(target.nfcid2, sensf_res->nfcid2, NFC_NFCID2_MAXSIZE);
+ target.nfcid2_len = NFC_NFCID2_MAXSIZE;
+
+ rc = digital_target_found(ddev, &target, NFC_PROTO_FELICA);
+
+exit:
+ dev_kfree_skb(resp);
+
+ if (rc)
+ digital_poll_next_tech(ddev);
+}
+
+int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech)
+{
+ struct digital_sensf_req *sensf_req;
+ struct sk_buff *skb;
+ int rc;
+ u8 size;
+
+ rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
+ if (rc)
+ return rc;
+
+ rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
+ NFC_DIGITAL_FRAMING_NFCF);
+ if (rc)
+ return rc;
+
+ size = sizeof(struct digital_sensf_req);
+
+ skb = digital_skb_alloc(ddev, size);
+ if (!skb)
+ return -ENOMEM;
+
+ skb_put(skb, size);
+
+ sensf_req = (struct digital_sensf_req *)skb->data;
+ sensf_req->cmd = DIGITAL_CMD_SENSF_REQ;
+ sensf_req->sc1 = 0xFF;
+ sensf_req->sc2 = 0xFF;
+ sensf_req->rc = 0;
+ sensf_req->tsn = 0;
+
+ *skb_push(skb, 1) = size + 1;
+
+ if (!DIGITAL_DRV_CAPS_IN_CRC(ddev))
+ digital_skb_add_crc_f(skb);
+
+ rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensf_res,
+ NULL);
+ if (rc)
+ kfree_skb(skb);
+
+ return rc;
+}

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