diff options
| author | Thierry Escande <thierry.escande@linux.intel.com> | 2013-09-19 19:55:28 +0400 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2013-09-25 04:02:25 +0400 |
| commit | 8c0695e4998dd268ff2a05951961247b7e015651 (patch) | |
| tree | 86087518d7435dbe788647ee04be2b460bab0ee8 /net/nfc/digital.h | |
| parent | 2c66daecc4092e6049673c281b2e6f0d5e59a94c (diff) | |
| download | linux-8c0695e4998dd268ff2a05951961247b7e015651.tar.xz | |
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/digital.h')
| -rw-r--r-- | net/nfc/digital.h | 13 |
1 files changed, 13 insertions, 0 deletions
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; |