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EC20 Linux » History » Version 6

laforge, 12/26/2016 09:22 PM
qescape mechanism

1 3 laforge 
{{>toc}}
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h1. EC20 Linux





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h2. Kernel Version





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It is using a modified version of a [[Qualcomm_Kernel]] which is available from https://source.codeaurora.org/quic/femto/kernel/msm





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<pre>





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$ for rev in `git tag | grep \^LNX.LE.2`; do patchsize=$(git diff -w $rev | wc -l); echo $patchsize $rev; done





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19247 LNX.LE.2.0-23056-9x15





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19188 LNX.LE.2.0-23060-9x15





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19188 LNX.LE.2.0-23061-9x15





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127972 LNX.LE.2.0-23115-9x15





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</pre>





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based on this we can see that the EC20 is using a @LNX.LE.2.0-23060-9x15@ derived version with about 19k lines of residual diff of Quectel specific changes.





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h2. SMD





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<pre>





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root@9615-cdp:/sys/kernel/debug/smd# cat tbl





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name=DS cid=0 ch type=0 xfer type=1 ref_count=2





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name= cid=0 ch type=0 xfer type=0 ref_count=0





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name= cid=0 ch type=0 xfer type=0 ref_count=0





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name= cid=0 ch type=0 xfer type=0 ref_count=0





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name=MSGR_SMD_P1 cid=4 ch type=11 xfer type=2 ref_count=2





    28
    
    
    
name=MSGR_SMD_P0 cid=5 ch type=11 xfer type=2 ref_count=2





    29
    
    
    
name=IPCRTR cid=6 ch type=1 xfer type=2 ref_count=1





    30
    
    
    
name=IPCRTR cid=7 ch type=2 xfer type=2 ref_count=1





    31
    
    
    
name=sys_mon cid=8 ch type=1 xfer type=2 ref_count=1





    32
    
    
    
name=DIAG_CNTL cid=9 ch type=1 xfer type=2 ref_count=2





    33
    
    
    
name=DIAG cid=10 ch type=1 xfer type=2 ref_count=2





    34
    
    
    
name=apr_audio_svc cid=11 ch type=1 xfer type=2 ref_count=1





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name=apr_voice_svc cid=12 ch type=2 xfer type=2 ref_count=2





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name=apr_apps2 cid=13 ch type=1 xfer type=2 ref_count=1





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name=RPCRPY_CNTL cid=14 ch type=0 xfer type=2 ref_count=2





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name=IPCROUTER cid=15 ch type=0 xfer type=0 ref_count=1





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name=SSM_RTR cid=16 ch type=0 xfer type=2 ref_count=1





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name=sys_mon cid=17 ch type=0 xfer type=2 ref_count=1





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name=DIAG_2 cid=18 ch type=0 xfer type=2 ref_count=2





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name=DIAG_CNTL cid=19 ch type=0 xfer type=2 ref_count=2





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name=DIAG cid=20 ch type=0 xfer type=2 ref_count=2





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name=apr_voice_svc cid=21 ch type=0 xfer type=2 ref_count=1





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name=DATA1 cid=22 ch type=0 xfer type=2 ref_count=2





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name=DATA2 cid=23 ch type=0 xfer type=2 ref_count=2





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name=DATA3 cid=24 ch type=0 xfer type=2 ref_count=2





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name=DATA4 cid=25 ch type=0 xfer type=2 ref_count=2





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name=DATA11 cid=26 ch type=0 xfer type=1 ref_count=2





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name=DATA40 cid=27 ch type=0 xfer type=2 ref_count=2





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name=DATA40_CNTL cid=28 ch type=0 xfer type=2 ref_count=2





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name=DATA8 cid=29 ch type=0 xfer type=2 ref_count=2





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name=DATA5_CNTL cid=30 ch type=0 xfer type=2 ref_count=2





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name=DATA6_CNTL cid=31 ch type=0 xfer type=2 ref_count=2





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name=DATA7_CNTL cid=32 ch type=0 xfer type=2 ref_count=2





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name=DATA8_CNTL cid=33 ch type=0 xfer type=2 ref_count=2





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name=GPSNMEA cid=34 ch type=0 xfer type=2 ref_count=2





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</pre>





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<pre>





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root@9615-cdp:/sys/kernel/debug/smd# cat ch 





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ch00:   OPENED(0000/0000) dcCiwrsb <->   OPENED(0000/0000) dCciwrsB :  2000





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ch04:   OPENED(12944/12944) DCCiwrsB <->   OPENED(12312/12312) DCCiwrsB :  8000





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ch05:   OPENED(0000/0000) DCCiwrsb <->   OPENED(28712/28712) DCCiwrsB : 10000





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ch06:   OPENED(1872/1872) DCCiwrsB <->   OPENED(0216/0216) DCCiwrsB :  2000





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ch07:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000





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ch08:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :   400





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ch09:   OPENED(0952/0952) DCCiwrsb <->   OPENED(0438/0438) DCCiwrsB :   400





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ch10:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsb :  2000





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ch11:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000





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ch12:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsb :  2000





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ch13:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000





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ch14:   OPENED(0412/0412) DCCiwrsB <->   OPENED(0140/0140) DCCiwrsB :   400





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ch15:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000





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ch16:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000





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ch17:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :   400





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ch18:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsb :  2000





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ch19:   OPENED(0952/0952) DCCiwrsb <->   OPENED(0370/0370) DCCiwrsB :   400





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ch20:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsb :  2000





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ch21:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000





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ch22:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dCciwrSb :  2000





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ch23:   OPENED(0000/0000) dcCiwrsb <->   OPENED(0000/0000) dCciwrsb :  2000





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ch24:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) dCciwrsb :  2000





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ch25:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dCciwrSb :  2000





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ch26:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dCciwrSb :  2000





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ch27:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dcciwrSb :  2000





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ch28:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsB :  2000





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ch29:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dcciwrSb :  2000





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ch30:   OPENED(0266/0266) DCCiwrsB <->   OPENED(0807/0807) DCCiwrsB :   400





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ch31:   OPENED(0237/0237) DCCiwrsB <->   OPENED(0415/0415) DCCiwrsB :   400





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ch32:   OPENED(0237/0237) DCCiwrsB <->   OPENED(0415/0415) DCCiwrsB :   400





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ch33:   OPENED(0237/0237) DCCiwrsB <->   OPENED(0415/0415) DCCiwrsB :   400





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ch34:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) dCciwrsb :  2000





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</pre>





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h2. ASOC





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<pre>





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root@9615-cdp:/sys/kernel/debug/asoc# cat dais





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rt5616-aif1





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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null-codec-dai





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msm-dai-stub





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DTMF_RX_HOSTLESS





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SEC_I2S_RX_HOSTLESS





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MI2S_TX_HOSTLESS





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VoLTE





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VOICE_STUB





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AUXPCM_HOSTLESS





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HDMI_HOSTLESS





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AFE-PROXY





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INT_FM_HOSTLESS





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SLIMBUS0_HOSTLESS





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MultiMedia4





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MultiMedia3





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VoIP





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CS-VOICE





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MultiMedia2





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MultiMedia1





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msm-dai-q6.32771





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msm-dai-q6.32772





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msm-dai-q6.32773





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msm-dai-q6.13





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msm-dai-q6.12





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msm-dai-q6.3





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msm-dai-q6.2





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msm-dai-q6.225





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msm-dai-q6.241





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msm-dai-q6.240





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msm-dai-q6.224





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msm-dai-q6.5





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msm-dai-q6.4





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msm-dai-q6.1





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msm-dai-q6.0





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msm-dai-q6.12289





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msm-dai-q6.12288





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msm-dai-q6.16385





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msm-dai-q6.16384





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msm-stub-tx





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msm-stub-rx





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</pre>





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<pre>





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root@9615-cdp:/sys/kernel/debug/asoc# cat platforms 





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msm-pcm-hostless





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msm-pcm-afe





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msm-pcm-routing





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msm-multi-ch-pcm-dsp





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msm-pcm-dsp





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msm-host-pcm-voice





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msm-pcm-dtmf





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msm-voip-dsp





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msm-pcm-voice





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snd-soc-dummy





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</pre>





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h2. BAM





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<pre>





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root@9615-cdp:/sys/kernel/debug/bam_dmux# cat tbl





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ch00  local open=Y  remote open=Y





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ch01  local open=Y  remote open=Y





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ch02  local open=Y  remote open=Y





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ch03  local open=Y  remote open=Y





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ch04  local open=N  remote open=N





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ch05  local open=N  remote open=N





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ch06  local open=N  remote open=N





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ch07  local open=N  remote open=N





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ch08  local open=N  remote open=N





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</pre>





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<pre>





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root@9615-cdp:/sys/kernel/debug/bam_dmux# cat log





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<DMUX> timestamp FLAGS [Message]





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FLAGS:





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        D: 1 = Power collapse disabled





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        R: 1 = in global reset





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        P: 1 = BAM is powered up





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        A: 1 = BAM initialized and ready for data





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        V: 1 = Uplink vote for power





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        U: 1 = Uplink active





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        W: 1 = Uplink Wait-for-ack





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        A: 1 = Uplink ACK received





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        #: >=1 On-demand uplink vote





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        D: 1 = Disconnect ACK active





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<DMUX> 2.068151990 drPa vuwa0D bam_dmux_smsm_cb: 0x00000000 -> 0x0800802b





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<DMUX> 2.068182511 drPa vuwa0D bam_dmux_smsm_cb: init





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<DMUX> 2.068213031 drPa vuwa0D grab_wakelock: ref count = 0





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<DMUX> 2.068213031 drPa vuwa0D vote_dfab





    204
    
    
    
<DMUX> 2.072150159 drPa vuwa0D toggle_apps_ack: apps ack 0->1





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<DMUX> 2.072333281 drPA vuwa0D grab_wakelock: ref count = 1





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<DMUX> 2.072363802 drPA vuwa0D handle_bam_mux_cmd: opening cid 0 PC disabled





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<DMUX> 2.072913168 DrPA vUwa0D handle_bam_mux_cmd: opening cid 1 PC disabled





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<DMUX> 2.073157331 DrPA vUwa0D handle_bam_mux_cmd: opening cid 2 PC disabled





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<DMUX> 2.073401494 DrPA vUwa0D handle_bam_mux_cmd: opening cid 3 PC disabled





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<DMUX> 2.135632534 DrPA vUwa0D release_wakelock: ref count = 2





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<DMUX> 3.072424842 DrPA vUwa0D ul_powerdown: powerdown





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<DMUX> 3.072455363 DrPA vUwa0D release_wakelock: ref count = 1





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<DMUX> 3.072455363 DrPA vuwa0D unvote_dfab





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<DMUX> 4.041233022 DrPA vuwa0D bam_dmux_smsm_cb: 0x08008029 -> 0x0800a02b





    215
    
    
    
<DMUX> 4.041263542 DrPA vuwa0D bam_dmux_smsm_cb: already processed this state





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<DMUX> 10.602899433 DrPA vuwa0D grab_wakelock: ref count = 0





    217
    
    
    
<DMUX> 10.602929954 DrPA vuwa0D vote_dfab





    218
    
    
    
<DMUX> 10.603479320 DrPA vUwa0D notify_all: cid=0, event=2, data=0





    219
    
    
    
<DMUX> 11.603815044 DrPA vUwa0D ul_timeout: pkt written 1





    220
    
    
    
<DMUX> 12.606409276 DrPA vUwa0D ul_powerdown: powerdown





    221
    
    
    
<DMUX> 12.606439796 DrPA vUwa0D release_wakelock: ref count = 1





    222
    
    
    
<DMUX> 12.606439796 DrPA vuwa0D notify_all: cid=0, event=3, data=0





    223
    
    
    
<DMUX> 12.606470317 DrPA vuwa0D notify_all: cid=1, event=3, data=0





    224
    
    
    
<DMUX> 12.606470317 DrPA vuwa0D notify_all: cid=2, event=3, data=0





    225
    
    
    
<DMUX> 12.606500837 DrPA vuwa0D notify_all: cid=3, event=3, data=0





    226
    
    
    
<DMUX> 12.606500837 DrPA vuwa0D unvote_dfab





    227
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</pre>/





    228
    
    
    





    229
    
    
    
h2. QESCAPE





    230
    
    
    





    231
    
    
    
* the u_smd.c file of the USB Gadget for SMD-based serial port forwarding is extended by Quectel.





    232
    
    
    
* it introduces a work queue that is scheduled in case of +++ detction on the AT command port: @qescape_handle()@





    233
    
    
    
* whenever +++ escaping is detected, a sysfs property @/proc/sys/kernel/qmodem_mode@ is set





    234
    
    
    
* this property is picked up in userspace by @quec_bridge@ and @quectel_daemon@








        
        

    














  

  
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