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| author | Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com> | 2013-04-03 06:02:13 (GMT) |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2013-04-11 14:29:07 (GMT) |
| commit | 53cf48399ad3b08c9115b4fce73dee0b6e726c91 (patch) | |
| tree | 69048951e15fc273952de4c019f0f26c8a799bf8 /drivers/cpufreq | |
| parent | 58520373d8aff974f4b3f1bd9eb84c1ff3d6bd8b (diff) | |
| download | linux-fsl-qoriq-53cf48399ad3b08c9115b4fce73dee0b6e726c91.tar.xz | |
NFC: pn533: Add support for ACS ACR122U reader
ACS ACR122U is an USB NFC reader, PC/SC and CCID compilant, based
on NXP PN532 chip.
Internally, it's build of MCU, PN532 and an antenna. MCU makes the
device CCID and PC/SC compilant and provide USB connection.
In this achitecture, a host cannot talk directly to PN532 and must
rely on MCU. Luckily, MCU exposes pseud-APDU through PC/SC Escape
mechanism which let the host to transmit standard PN532 commands
directly to PN532 chip with some limitations.
The frame roughly looks like:
CCID header | APDU header | PN532 header
(pc_to_rdr_escape) | (pseudo apdu Direct Tramsmit) | (len, TFI, cmd, params)
Accordign to limitations, ACR122U does't provide any mechanism to
abort last issued command.
Signed-off-by: Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/cpufreq')
0 files changed, 0 insertions, 0 deletions