diff options
| author | Thierry Escande <thierry.escande@collabora.com> | 2016-07-08 15:52:45 +0200 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2016-07-11 02:01:14 +0200 |
| commit | 1a09c56f545c8ff8d338a38c7c40d79f4165a94c (patch) | |
| tree | b9324ff10a1ecd1432449a18c3aeba9de7b5c330 /include/net/nfc | |
| parent | e200f008ace69eebac0a1432dc9e24ab5cd0d029 (diff) | |
| download | lwn-1a09c56f545c8ff8d338a38c7c40d79f4165a94c.tar.gz lwn-1a09c56f545c8ff8d338a38c7c40d79f4165a94c.zip | |
NFC: digital: Add support for NFC DEP Response Waiting Time
When sending an ATR_REQ, the initiator must wait for the ATR_RES at
least 'RWT(nfcdep,activation) + dRWT(nfcdep)' and no more than
'RWT(nfcdep,activation) + dRWT(nfcdep) + dT(nfcdep,initiator)'. This
gives a timeout value between 1237 ms and 1337 ms. This patch defines
DIGITAL_ATR_RES_RWT to 1337 used for the timeout value of ATR_REQ
command.
For other DEP PDUs, the initiator must wait between 'RWT + dRWT(nfcdep)'
and 'RWT + dRWT(nfcdep) + dT(nfcdep,initiator)' where RWT is given by
the following formula: '(256 * 16 / f(c)) * 2^wt' where wt is the value
of the TO field in the ATR_RES response and is in the range between 0
and 14. This patch declares a mapping table for wt values and gives RWT
max values between 100 ms and 5049 ms.
This patch also defines DIGITAL_ATR_RES_TO_WT, the maximum wt value in
target mode, to 8.
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'include/net/nfc')
| -rw-r--r-- | include/net/nfc/digital.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h index f9a4e4771861..74fa7eb94e72 100644 --- a/include/net/nfc/digital.h +++ b/include/net/nfc/digital.h @@ -226,6 +226,7 @@ struct nfc_digital_dev { u8 curr_rf_tech; u8 curr_nfc_dep_pni; u8 did; + u16 dep_rwt; u8 local_payload_max; u8 remote_payload_max; |