#17434: rt3052: missing tx/rx antenna selection and operating modes
------------------------------------------+--------------------------------
Reporter: braveheart_leo@… | Owner: developers
Type: enhancement | Status: new
Priority: normal | Milestone: Chaos Calmer
Component: kernel | (trunk)
Keywords: rt3052 rx tx antenna rt-n13u | Version: Trunk
------------------------------------------+--------------------------------
Per Ralink RT3050/52 datasheet, RT3052 SoC has an embedded 2T2R 2.4GHz
CMOS RF, with 1x1/1x2/2x2 operating modes. [#point1 (1)]
However, antenna selection appears to be missing, at least in CHAOS CALMER
(Bleeding Edge, r42041):
{{{
# iw phy0 info
Wiphy phy0
max # scan SSIDs: 4
max scan IEs length: 2257 bytes
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* AP/VLAN
* WDS
* monitor
* mesh point
Band 1:
Capabilities: 0x2f2
HT20/HT40
Static SM Power Save
RX Greenfield
RX HT20 SGI
RX HT40 SGI
TX STBC
RX STBC 2-streams
Max AMSDU length: 3839 bytes
No DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 2 usec (0x04)
HT RX MCS rate indexes supported: 0-15, 32
TX unequal modulation not supported
HT TX Max spatial streams: 2
HT TX MCS rate indexes supported may differ
Frequencies:
* 2412 MHz [1] (20.0 dBm)
* 2417 MHz [2] (20.0 dBm)
* 2422 MHz [3] (20.0 dBm)
* 2427 MHz [4] (20.0 dBm)
* 2432 MHz [5] (20.0 dBm)
* 2437 MHz [6] (20.0 dBm)
* 2442 MHz [7] (20.0 dBm)
* 2447 MHz [8] (20.0 dBm)
* 2452 MHz [9] (20.0 dBm)
* 2457 MHz [10] (20.0 dBm)
* 2462 MHz [11] (20.0 dBm)
* 2467 MHz [12] (20.0 dBm)
* 2472 MHz [13] (20.0 dBm)
* 2484 MHz [14] (disabled)
valid interface combinations:
* #{ managed, AP, mesh point } <= 8,
total <= 8, #channels <= 1
HT Capability overrides:
* MCS: ff ff ff ff ff ff ff ff ff ff
* maximum A-MSDU length
* supported channel width
* short GI for 40 MHz
* max A-MPDU length exponent
* min MPDU start spacing
}}}
''Available Antennas: TX 0 RX 0'' indicates that there are no tx/rx
antennas available for selection, even though the datasheet tells
otherwise. Perhaps this is just a matter of the kernel driver not exposing
the antennas to the OS?
This is the system, for reference:
{{{
# cat /proc/cpuinfo
system type : Ralink RT3052 id:1 rev:3
machine : Asus RT-N13U
processor : 0
cpu model : MIPS 24KEc V4.12
BogoMIPS : 255.59
wait instruction : yes
microsecond timers : yes
tlb_entries : 32
extra interrupt vector : yes
hardware watchpoint : yes, count: 4, address/irw mask: [0x0000,
0x0ff8, 0x0ff8, 0x0ff8]
isa : mips1 mips2 mips32r1 mips32r2
ASEs implemented : mips16 dsp
shadow register sets : 1
kscratch registers : 0
core : 0
VCED exceptions : not available
VCEI exceptions : not available
}}}
And before someone points out that the device only has internal antennas
(though I plan to do an antenna mod to the device to add external
antennas.), I have an older Atheros-based, D-Link DIR-300 router that has
both 1x internal and 1x external antennas, and I can control antenna
selection via ''/proc/sys/dev/wifi0/[rx|tx]antenna''.
There is no ''/proc/sys/dev/wlan0/'' for RT-N13U, which is why the missing
antenna selection. Can antenna selection be enabled for the ralink
wireless driver in the kernel, or am I missing something else that
prevents antenna selection for this particular device?
[=#point1 (1)]
http://www.tracermcc.ru/foto/bender/RT3050_5x_V2.0_081408_0902.pdf
--
Ticket URL: <https://dev.openwrt.org/ticket/17434>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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