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AKM8976A » History » Version 10

Paul Kocialkowski, 07/03/2011 11:21 AM

1 1 Paul Kocialkowski 
=  AKM8976A =
2 





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The goal here is to add support for AKM8976A to akmd-free (a free rewrite of akmd, the daemon that deals with the accelerometer/magnetometer data for a few chips, including AKM ones). 





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This page is to coordinate the work around this goal.





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== Current status ==





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=== Global tasks achievement ===





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|| Task || Achievement ||





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|| Modifying the kernel driver to print the requests akmd makes (ioctl, etc) || [[span(Done , style=background: green; color: white; display: inline-block; width: 100%;)]] ||





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|| Get an idea of how it works (what akmd does after what) || [[span(Done , style=background: green; color: white; display: inline-block; width: 100%;)]] ||





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|| Define the exact steps that akmd follows || [[span(Done , style=background: green; color: white; display: inline-block; width: 100%;)]] ||





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|| Implement AKM8976A in akmd-free without any data treatment yet || [[span(Done , style=background: green; color: white; display: inline-block; width: 100%;)]] ||





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|| Understand how the data is treated (algorithms, etc) || [[span(Work in progress , style=background: orange; color: white; display: inline-block; width: 100%;)]] ||





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|| Reproduce the data treatment with standard C code || [[span(Work in progress , style=background: orange; color: white; display: inline-block; width: 100%;)]] ||





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|| Include the data treatment code in akmd-free || [[span(TODO , style=background: red; color: white; display: inline-block; width: 100%;)]] ||





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|| Check that everything is OK on different devices || [[span(TODO , style=background: red; color: white; display: inline-block; width: 100%;)]] ||





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=== Specific tasks achievement ===





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==== Initialization/calibration sequence ====





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|| Task || Global achievement || Understood || Reproduced || Implemented ||





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|| Before the first ECS_IOCTL_GETDATA || [[span(Mostly done , style=background: orange; color: white; display: inline-block; width: 100%;)]] || [[span(Done , style=background: green; color: white; display: inline-block; width: 100%;)]] || [[span(Done , style=background: green; color: white; display: inline-block; width: 100%;)]] || [[span(TODO , style=background: red; color: white; display: inline-block; width: 100%;)]]





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== Getting started ==





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Note that before everything, coming on our IRC channel [https://www.jappix.com/?r=replicant%25irc.freenode.net@irc.jappix.com #replicant on irc.freenode.net] and introducing yourself is essential: you'll be able to get help there and, of course, if you want to join the effort, communication is fundamental. 





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If you plan to join the effort to achieve this goal, here are the steps: 





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 * Downloading and setting up the akm8976a-dev branch for kernel-msm (which contains a modified version of ''drivers/misc/akm8976.c'')





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 * Downloading some scripts that are useful to debug fast





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 * Download and build the re_set_data tool (to inject some data to the kernel)





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 * Generate the file containing the "phone" button pressed sequence. 





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 * Get the non-free akmd. 





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== Using the scripts/tools ==





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First of all, you need to know that the kernel-side driver that is used for AKM8976A is located at ''drivers/misc/akm8976.c''.





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This file has been modified in order to:





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 * make it trace (print) all the ioctl





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 * make it possible to inject data 





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Note that before you run any of the scripts, you need to start adb server as root:





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{{{ # adb start-server }}}





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Here is a list of the scripts, what they do and how to use them:





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 * '''replicant_kern_debug.sh''': this one is to get the debug messages from the kernel. It requires no special parameter, nor any specific location to be lunched in. 





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 * '''replicant_calib_kern.sh''': this script should be used while working on the calibration part. The 2 remaining initialisation sequences we miss start with { 4, 235 } and { 4, 241 } and this script is to print the calibration values for these sequences (when the kernel printk the values, so when akmd sends them). To use it, pass 235 or 241 as first argument to the script, for the first or 2nd initialisation sequence we miss. 





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 * '''replicant_calib_adb.sh''': this script should be used while working on the calibration part. This script has to be ran in the directory containing ''akmd_set_dev.txt'' and ''re_set_data.txt''. You can also pass the directory containing these files as first argument to the script. In the correct order, this script: 





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  * copies the ''akmd_set_dev.txt'' file to ''/data/misc/akmd_set.txt'' (akmd calibration file)





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  * copies the ''re_set_data.txt'' file to ''/data/re_set_data.txt'' (retro engineering file, which contains the values to force as ECS_IOCTL_GETDATA returning values)





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  * lunches ''/data/re_set_data load'' to inject the values from ''/data/re_set_data.txt'' to the kernel





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  * lunches ''akmd'', which won't do anything if the phone is in sleep mode (black screen).





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  * inject ''/data/suspend_wake'' to ''/dev/input/event4'' (the buttons event node) to wakeup the phone





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  * wait for akmd to perform the initialisation sequence, that you should see with '''replicant_calib_kern.sh'''.





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  * kill akmd





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  * inject ''/data/suspend_wake'' to ''/dev/input/event4'' (the buttons event node) to put the phone in sleep mode





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You can also avoid the use of the scripts and directly run the needed commands:





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 * '''adb push akmd_set_dev.txt /data/misc/akmd_set.txt''': this is to copy ''akmd_set_dev.txt'' (akmd calibration file) to its correct location on the device. You need to run that in the directory where ''akmd_set_dev.txt'' is.





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 * '''adb push re_set_data.txt /data/re_set_data.txt''': this is to copy ''re_set_data.txt'' (retro engineering file, which contains the values to force as ECS_IOCTL_GETDATA returning values)to its correct location on the device. You need to run that in the directory where ''re_set_data.txt'' is.





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 * '''adb shell "/data/re_set_data load"''': this is to inject the values from ''/data/re_set_data.txt'' to the kernel driver.





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 * '''adb shell /data/akmd''': this is to start the non-free akmd daemon.





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 * '''adb shell "cat /data/suspend_wake  > /dev/input/event4"''': this is to inject the "phone" button pressed event, so it will either wakeup the phone or set it in sleep mode. 





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 * '''adb shell "killall akmd"''': this is to kill the non-free akmd daemon.





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 * '''adb shell "echo 8 > /proc/sys/kernel/printk && cat /proc/kmsg"''': this is to set the verbosity level of the kernel messages to high and print the messages.





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== Conclusions on how it works ==





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To begin with, here is the trace of the requests akmd does to the kernel driver (using the ioctl system call):





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{{{





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<6>[ 2066.362670] --> ECS_IOCTL_SET_MODE #1





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<6>[ 2066.363220] --> ECS_IOCTL_SET_MODE





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<6>[ 2066.364074]  --> AKECS_MODE_E2P_READ





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<6>[ 2066.381042] --> ECS_IOCTL_READ #1





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<6>[ 2066.381317] what is in rwbuf?





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<6>[ 2066.381744] --------------------





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<6>[ 2066.382019] |	index	|	hdata	|	ddata	|





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<6>[ 2066.382263] |	0	|	0x1	|	1	|





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<6>[ 2066.382507] |	1	|	0x42	|	66	|





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<6>[ 2066.382934] |	2	|	0x0	|	0	|





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<6>[ 2066.383178] |	3	|	0x0	|	0	|





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<6>[ 2066.383392] |	4	|	0x0	|	0	|





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<6>[ 2066.383636] ----------





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<6>[ 2066.384063] --> ECS_IOCTL_READ





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<6>[ 2066.384979] --> ECS_IOCTL_READ #3





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<6>[ 2066.385253] --------------------





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<6>[ 2066.385498] |	index	|	hdata	|	ddata	|





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<6>[ 2066.385925] |	0	|	0x1	|	1	|





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<6>[ 2066.386169] |	1	|	0x66	|	102	|





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<6>[ 2066.386383] |	2	|	0x0	|	0	|





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<6>[ 2066.386627] |	3	|	0x0	|	0	|





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<6>[ 2066.387054] |	4	|	0x0	|	0	|





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<6>[ 2066.387268] ----------





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<6>[ 2066.387542] --> ECS_IOCTL_SET_MODE #1





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<6>[ 2066.387786] --> ECS_IOCTL_SET_MODE





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<6>[ 2066.388214]  --> AKECS_MODE_POWERDOWN





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<6>[ 2066.401031] --> ECS_IOCTL_GET_OPEN_STATUS





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<6>[ 2066.401306] --> ECS_IOCTL_GET_OPEN_STATUS #3





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<6>[ 2066.407135] --> ECS_IOCTL_INIT





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<6>[ 2066.408020] --> ECS_IOCTL_SET_MODE #1





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<6>[ 2066.408294] --> ECS_IOCTL_SET_MODE





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<6>[ 2066.408721]  --> AKECS_MODE_E2P_READ





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<6>[ 2066.421234] --> ECS_IOCTL_READ #1





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<6>[ 2066.421630] what is in rwbuf?





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<6>[ 2066.422302] --------------------





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<6>[ 2066.422637] |	index	|	hdata	|	ddata	|





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<6>[ 2066.423004] |	0	|	0x3	|	3	|





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<6>[ 2066.423339] |	1	|	0x46	|	70	|





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<6>[ 2066.423950] |	2	|	0x0	|	0	|





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<6>[ 2066.424285] |	3	|	0x0	|	0	|





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<6>[ 2066.424621] |	4	|	0x0	|	0	|





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<6>[ 2066.424957] ----------





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<6>[ 2066.425567] --> ECS_IOCTL_READ





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<6>[ 2066.426696] --> ECS_IOCTL_READ #3





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<6>[ 2066.427062] --------------------





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<6>[ 2066.427398] |	index	|	hdata	|	ddata	|





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<6>[ 2066.428039] |	0	|	0x3	|	3	|





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<6>[ 2066.428375] |	1	|	0x97	|	151	|





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<6>[ 2066.428710] |	2	|	0x87	|	135	|





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<6>[ 2066.429321] |	3	|	0x19	|	25	|





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<6>[ 2066.429656] |	4	|	0x0	|	0	|





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<6>[ 2066.429992] ----------





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<6>[ 2066.431243] --> ECS_IOCTL_SET_MODE #1





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<6>[ 2066.431915] --> ECS_IOCTL_SET_MODE





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<6>[ 2066.432250]  --> AKECS_MODE_POWERDOWN





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<6>[ 2066.450866] --> ECS_IOCTL_WRITE #1





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<6>[ 2066.451385] what is in rwbuf?





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<6>[ 2066.452239] --------------------





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<6>[ 2066.452697] |	index	|	hdata	|	ddata	|





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<6>[ 2066.453186] |	0	|	0x4	|	4	|





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<6>[ 2066.454040] |	1	|	0xe8	|	232	|





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<6>[ 2066.454498] |	2	|	0x7	|	7	|





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<6>[ 2066.454956] |	3	|	0x7	|	7	|





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<6>[ 2066.455413] |	4	|	0x9	|	9	|





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<6>[ 2066.456268] ----------





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<6>[ 2066.456726] --> ECS_IOCTL_WRITE





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<6>[ 2066.457916] --> ECS_IOCTL_WRITE #1





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<6>[ 2066.458374] what is in rwbuf?





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<6>[ 2066.459228] --------------------





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<6>[ 2066.459686] |	index	|	hdata	|	ddata	|





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<6>[ 2066.460174] |	0	|	0x4	|	4	|





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<6>[ 2066.460784] |	1	|	0xe5	|	229	|





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<6>[ 2066.461669] |	2	|	0x89	|	137	|





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<6>[ 2066.462127] |	3	|	0x0	|	0	|





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<6>[ 2066.462615] |	4	|	0x89	|	137	|





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<6>[ 2066.463073] ----------





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<6>[ 2066.463928] --> ECS_IOCTL_WRITE





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<6>[ 2066.465698] --> ECS_IOCTL_SET_MODE #1





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<6>[ 2066.466186] --> ECS_IOCTL_SET_MODE





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<6>[ 2066.467071]  --> AKECS_MODE_MEASURE_SNG





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<6>[ 2066.480468] --> ECS_IOCTL_GETDATA





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<6>[ 2066.480987] --> ECS_IOCTL_GETDATA #3





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<6>[ 2066.481445] --------------------





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<6>[ 2066.482299] |	index	|	hdata	|	ddata	|





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<6>[ 2066.482788] gflag1|	0	|	0x70	|	112	|





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<6>[ 2066.483245] gflag1|	1	|	0x7f	|	127	|





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<6>[ 2066.484588] gflag1|	3	|	0x5c	|	92	|





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    302
    
    
    
<6>[ 2066.500122] gflag1|	29	|	0x0	|	0	|





    303
    
    
    





    304
    
    
    
<6>[ 2066.500671] gflag1|	30	|	0x0	|	0	|





    305
    
    
    





    306
    
    
    
<6>[ 2066.501525] gflag1|	31	|	0x0	|	0	|





    307
    
    
    





    308
    
    
    
<6>[ 2066.501983] ----------





    309
    
    
    





    310
    
    
    
<6>[ 2066.509826] --> ECS_IOCTL_GET_NUMFRQ





    311
    
    
    





    312
    
    
    
<6>[ 2066.510559] --> ECS_IOCTL_GET_NUMFRQ #3





    313
    
    
    





    314
    
    
    
<6>[ 2066.511444] --------------------





    315
    
    
    





    316
    
    
    
<6>[ 2066.511901] |	index	|	hdata	|	ddata	|





    317
    
    
    





    318
    
    
    
<6>[ 2066.512390] |	0	|	0x1	|	1	|





    319
    
    
    





    320
    
    
    
<6>[ 2066.513244] |	1	|	0x0	|	0	|





    321
    
    
    





    322
    
    
    
<6>[ 2066.513702] ----------





    323
    
    
    





    324
    
    
    
<6>[ 2066.515655] --> ECS_IOCTL_WRITE #1





    325
    
    
    





    326
    
    
    
<6>[ 2066.516174] what is in rwbuf?





    327
    
    
    





    328
    
    
    
<6>[ 2066.517120] --------------------





    329
    
    
    





    330
    
    
    
<6>[ 2066.517578] |	index	|	hdata	|	ddata	|





    331
    
    
    





    332
    
    
    
<6>[ 2066.518066] |	0	|	0x4	|	4	|





    333
    
    
    





    334
    
    
    
<6>[ 2066.518524] |	1	|	0xee	|	238	|





    335
    
    
    





    336
    
    
    
<6>[ 2066.519378] |	2	|	0x10	|	16	|





    337
    
    
    





    338
    
    
    
<6>[ 2066.519836] |	3	|	0x10	|	16	|





    339
    
    
    





    340
    
    
    
<6>[ 2066.520324] |	4	|	0x10	|	16	|





    341
    
    
    





    342
    
    
    
<6>[ 2066.520904] ----------





    343
    
    
    





    344
    
    
    
<6>[ 2066.521789] --> ECS_IOCTL_WRITE





    345
    
    
    





    346
    
    
    
<6>[ 2066.524230] --> ECS_IOCTL_WRITE #1





    347
    
    
    





    348
    
    
    
<6>[ 2066.524749] what is in rwbuf?





    349
    
    
    





    350
    
    
    
<6>[ 2066.525299] --------------------





    351
    
    
    





    352
    
    
    
<6>[ 2066.526153] |	index	|	hdata	|	ddata	|





    353
    
    
    





    354
    
    
    
<6>[ 2066.526641] |	0	|	0x4	|	4	|





    355
    
    
    





    356
    
    
    
<6>[ 2066.527099] |	1	|	0xeb	|	235	|





    357
    
    
    





    358
    
    
    
<6>[ 2066.527954] |	2	|	0x3	|	3	|





    359
    
    
    





    360
    
    
    
<6>[ 2066.528411] |	3	|	0x7	|	7	|





    361
    
    
    





    362
    
    
    
<6>[ 2066.528869] |	4	|	0x8a	|	138	|





    363
    
    
    





    364
    
    
    
<6>[ 2066.529357] ----------





    365
    
    
    





    366
    
    
    
<6>[ 2066.529815] --> ECS_IOCTL_WRITE





    367
    
    
    





    368
    
    
    
<6>[ 2066.532836] --> ECS_IOCTL_WRITE #1





    369
    
    
    





    370
    
    
    
<6>[ 2066.533355] what is in rwbuf?





    371
    
    
    





    372
    
    
    
<6>[ 2066.533874] --------------------





    373
    
    
    





    374
    
    
    
<6>[ 2066.534729] |	index	|	hdata	|	ddata	|





    375
    
    
    





    376
    
    
    
<6>[ 2066.535186] |	0	|	0x2	|	2	|





    377
    
    
    





    378
    
    
    
<6>[ 2066.535675] |	1	|	0xf4	|	244	|





    379
    
    
    





    380
    
    
    
<6>[ 2066.536132] |	2	|	0x55	|	85	|





    381
    
    
    





    382
    
    
    
<6>[ 2066.537017] |	3	|	0x0	|	0	|





    383
    
    
    





    384
    
    
    
<6>[ 2066.537475] |	4	|	0x0	|	0	|





    385
    
    
    





    386
    
    
    
<6>[ 2066.537933] ----------





    387
    
    
    





    388
    
    
    
<6>[ 2066.538391] --> ECS_IOCTL_WRITE





    389
    
    
    





    390
    
    
    
<6>[ 2066.539947] --> ECS_IOCTL_WRITE #1





    391
    
    
    





    392
    
    
    
<6>[ 2066.540618] what is in rwbuf?





    393
    
    
    





    394
    
    
    
<6>[ 2066.541107] --------------------





    395
    
    
    





    396
    
    
    
<6>[ 2066.541534] |	index	|	hdata	|	ddata	|





    397
    
    
    





    398
    
    
    
<6>[ 2066.542388] |	0	|	0x2	|	2	|





    399
    
    
    





    400
    
    
    
<6>[ 2066.542877] |	1	|	0xf5	|	245	|





    401
    
    
    





    402
    
    
    
<6>[ 2066.543334] |	2	|	0x1b	|	27	|





    403
    
    
    





    404
    
    
    
<6>[ 2066.544219] |	3	|	0x0	|	0	|





    405
    
    
    





    406
    
    
    
<6>[ 2066.544677] |	4	|	0x0	|	0	|





    407
    
    
    





    408
    
    
    
<6>[ 2066.545135] ----------





    409
    
    
    





    410
    
    
    
<6>[ 2066.545623] --> ECS_IOCTL_WRITE





    411
    
    
    





    412
    
    
    
<6>[ 2066.548126] --> ECS_IOCTL_WRITE #1





    413
    
    
    





    414
    
    
    
<6>[ 2066.548370] what is in rwbuf?





    415
    
    
    





    416
    
    
    
<6>[ 2066.548614] --------------------





    417
    
    
    





    418
    
    
    
<6>[ 2066.548858] |	index	|	hdata	|	ddata	|





    419
    
    
    





    420
    
    
    
<6>[ 2066.549285] |	0	|	0x2	|	2	|





    421
    
    
    





    422
    
    
    
<6>[ 2066.549530] |	1	|	0xf6	|	246	|





    423
    
    
    





    424
    
    
    
<6>[ 2066.549743] |	2	|	0x8	|	8	|





    425
    
    
    





    426
    
    
    
<6>[ 2066.549987] |	3	|	0x0	|	0	|





    427
    
    
    





    428
    
    
    
<6>[ 2066.550537] |	4	|	0x0	|	0	|





    429
    
    
    





    430
    
    
    
<6>[ 2066.550781] ----------





    431
    
    
    





    432
    
    
    
<6>[ 2066.551025] --> ECS_IOCTL_WRITE





    433
    
    
    





    434
    
    
    
<6>[ 2066.552398] --> ECS_IOCTL_WRITE #1





    435
    
    
    





    436
    
    
    
<6>[ 2066.552856] what is in rwbuf?





    437
    
    
    





    438
    
    
    
<6>[ 2066.553131] --------------------





    439
    
    
    





    440
    
    
    
<6>[ 2066.553375] |	index	|	hdata	|	ddata	|





    441
    
    
    





    442
    
    
    
<6>[ 2066.553802] |	0	|	0x4	|	4	|





    443
    
    
    





    444
    
    
    
<6>[ 2066.554046] |	1	|	0xf1	|	241	|





    445
    
    
    





    446
    
    
    
<6>[ 2066.554260] |	2	|	0x84	|	132	|





    447
    
    
    





    448
    
    
    
<6>[ 2066.554504] |	3	|	0x87	|	135	|





    449
    
    
    





    450
    
    
    
<6>[ 2066.554931] |	4	|	0x83	|	131	|





    451
    
    
    





    452
    
    
    
<6>[ 2066.555145] ----------





    453
    
    
    





    454
    
    
    
<6>[ 2066.555389] --> ECS_IOCTL_WRITE





    455
    
    
    





    456
    
    
    
<6>[ 2066.557525] --> ECS_IOCTL_GET_CLOSE_STATUS





    457
    
    
    





    458
    
    
    
<6>[ 2066.558074] --> ECS_IOCTL_GET_DELAY





    459
    
    
    





    460
    
    
    
<6>[ 2066.558319] --> ECS_IOCTL_GET_DELAY #3





    461
    
    
    





    462
    
    
    
<6>[ 2066.761016] --> ECS_IOCTL_SET_MODE #1





    463
    
    
    





    464
    
    
    
<6>[ 2066.761932] --> ECS_IOCTL_SET_MODE





    465
    
    
    





    466
    
    
    
<6>[ 2066.762420]  --> AKECS_MODE_MEASURE_SNG





    467
    
    
    





    468
    
    
    
<6>[ 2066.781555] --> ECS_IOCTL_GETDATA





    469
    
    
    





    470
    
    
    
<6>[ 2066.782531] --> ECS_IOCTL_GETDATA #3





    471
    
    
    





    472
    
    
    
<6>[ 2066.783020] --------------------





    473
    
    
    





    474
    
    
    
<6>[ 2066.783477] |	index	|	hdata	|	ddata	|





    475
    
    
    





    476
    
    
    
<6>[ 2066.783935] gflag1|	0	|	0x70	|	112	|





    477
    
    
    





    478
    
    
    
<6>[ 2066.784820] gflag1|	1	|	0x7f	|	127	|





    479
    
    
    





    480
    
    
    
<6>[ 2066.785278] gflag1|	2	|	0xa3	|	163	|





    481
    
    
    





    482
    
    
    
<6>[ 2066.785766] gflag1|	3	|	0x5d	|	93	|





    483
    
    
    





    484
    
    
    
<6>[ 2066.786621] gflag1|	4	|	0x68	|	104	|





    485
    
    
    





    486
    
    
    
<6>[ 2066.787078] gflag1|	5	|	0x86	|	134	|





    487
    
    
    





    488
    
    
    
<6>[ 2066.787567] gflag1|	6	|	0x5c	|	92	|





    489
    
    
    





    490
    
    
    
<6>[ 2066.788421] gflag1|	7	|	0x85	|	133	|





    491
    
    
    





    492
    
    
    
<6>[ 2066.788879] gflag1|	8	|	0x0	|	0	|





    493
    
    
    





    494
    
    
    
<6>[ 2066.789367] gflag1|	9	|	0x0	|	0	|





    495
    
    
    





    496
    
    
    
<6>[ 2066.790222] gflag1|	10	|	0x0	|	0	|





    497
    
    
    





    498
    
    
    
<6>[ 2066.790832] gflag1|	11	|	0x0	|	0	|





    499
    
    
    





    500
    
    
    
<6>[ 2066.791320] gflag1|	12	|	0x0	|	0	|





    501
    
    
    





    502
    
    
    
<6>[ 2066.791778] gflag1|	13	|	0x0	|	0	|





    503
    
    
    





    504
    
    
    
<6>[ 2066.792663] gflag1|	14	|	0x0	|	0	|





    505
    
    
    





    506
    
    
    
<6>[ 2066.793121] gflag1|	15	|	0x0	|	0	|





    507
    
    
    





    508
    
    
    
<6>[ 2066.793579] gflag1|	16	|	0x0	|	0	|





    509
    
    
    





    510
    
    
    
<6>[ 2066.794464] gflag1|	17	|	0xa3	|	163	|





    511
    
    
    





    512
    
    
    
<6>[ 2066.794921] gflag1|	18	|	0x5d	|	93	|





    513
    
    
    





    514
    
    
    
<6>[ 2066.795379] gflag1|	19	|	0x68	|	104	|





    515
    
    
    





    516
    
    
    
<6>[ 2066.796264] gflag1|	20	|	0x86	|	134	|





    517
    
    
    





    518
    
    
    
<6>[ 2066.796722] gflag1|	21	|	0x5c	|	92	|





    519
    
    
    





    520
    
    
    
<6>[ 2066.797210] gflag1|	22	|	0x85	|	133	|





    521
    
    
    





    522
    
    
    
<6>[ 2066.798065] gflag1|	23	|	0x0	|	0	|





    523
    
    
    





    524
    
    
    
<6>[ 2066.798553] gflag1|	24	|	0x0	|	0	|





    525
    
    
    





    526
    
    
    
<6>[ 2066.799041] gflag1|	25	|	0x0	|	0	|





    527
    
    
    





    528
    
    
    
<6>[ 2066.799499] gflag1|	26	|	0x0	|	0	|





    529
    
    
    





    530
    
    
    
<6>[ 2066.800354] gflag1|	27	|	0x0	|	0	|





    531
    
    
    





    532
    
    
    
<6>[ 2066.800903] gflag1|	28	|	0x0	|	0	|





    533
    
    
    





    534
    
    
    
<6>[ 2066.801391] gflag1|	29	|	0x0	|	0	|





    535
    
    
    





    536
    
    
    
<6>[ 2066.802246] gflag1|	30	|	0x0	|	0	|





    537
    
    
    





    538
    
    
    
<6>[ 2066.802703] gflag1|	31	|	0x0	|	0	|





    539
    
    
    





    540
    
    
    
<6>[ 2066.803161] ----------





    541
    
    
    





    542
    
    
    
<6>[ 2066.807067] --> ECS_IOCTL_GET_NUMFRQ





    543
    
    
    





    544
    
    
    
<6>[ 2066.808044] --> ECS_IOCTL_GET_NUMFRQ #3





    545
    
    
    





    546
    
    
    
<6>[ 2066.808502] --------------------





    547
    
    
    





    548
    
    
    
<6>[ 2066.808959] |	index	|	hdata	|	ddata	|





    549
    
    
    





    550
    
    
    
<6>[ 2066.809814] |	0	|	0x1	|	1	|





    551
    
    
    





    552
    
    
    
<6>[ 2066.810302] |	1	|	0x0	|	0	|





    553
    
    
    





    554
    
    
    
<6>[ 2066.810943] ----------





    555
    
    
    





    556
    
    
    
<6>[ 2066.813629] --> ECS_IOCTL_SET_YPR #1





    557
    
    
    





    558
    
    
    
<6>[ 2066.814636] --------------------





    559
    
    
    





    560
    
    
    
<6>[ 2066.815093] |	index	|	hdata	|	ddata	|





    561
    
    
    





    562
    
    
    
<6>[ 2066.815582] gflag2|	0	|	0x55	|	85	|





    563
    
    
    





    564
    
    
    
<6>[ 2066.816467] gflag2|	1	|	0xffffffff	|	-1	|





    565
    
    
    





    566
    
    
    
<6>[ 2066.816925] gflag2|	2	|	0x2	|	2	|





    567
    
    
    





    568
    
    
    
<6>[ 2066.817382] gflag2|	3	|	0x1e	|	30	|





    569
    
    
    





    570
    
    
    
<6>[ 2066.817840] gflag2|	4	|	0x1	|	1	|





    571
    
    
    





    572
    
    
    
<6>[ 2066.818328] gflag2|	5	|	0x0	|	0	|





    573
    
    
    





    574
    
    
    
<6>[ 2066.818786] gflag2|	6	|	0x14	|	20	|





    575
    
    
    





    576
    
    
    
<6>[ 2066.819244] gflag2|	7	|	0xfffffd3b	|	-709	|





    577
    
    
    





    578
    
    
    
<6>[ 2066.820129] gflag2|	8	|	0x11	|	17	|





    579
    
    
    





    580
    
    
    
<6>[ 2066.820770] gflag2|	9	|	0x185	|	389	|





    581
    
    
    





    582
    
    
    
<6>[ 2066.821258] gflag2|	10	|	0xffffffe7	|	-25	|





    583
    
    
    





    584
    
    
    
<6>[ 2066.822113] gflag2|	11	|	0xfffffe20	|	-480	|





    585
    
    
    





    586
    
    
    
<6>[ 2066.822570] ----------





    587
    
    
    





    588
    
    
    
<6>[ 2066.823028] --> ECS_IOCTL_SET_YPR





    589
    
    
    





    590
    
    
    
<6>[ 2066.823913] AKECS_Report_Value: yaw = 85, pitch = -1, roll = 2





    591
    
    
    





    592
    
    
    
<6>[ 2066.824401]                     tmp = 30, m_stat= 1, g_stat=0





    593
    
    
    





    594
    
    
    
<6>[ 2066.825286]           G_Sensor:   x = 20 LSB, y = -709 LSB, z = 17 LSB





    595
    
    
    





    596
    
    
    
<6>[ 2066.825744]                MAG:   MAGV_X = 389, MAGV_Y = -25, MAGV_Z = -480





    597
    
    
    





    598
    
    
    
<6>[ 2066.829833] --> ECS_IOCTL_GET_DELAY





    599
    
    
    





    600
    
    
    
<6>[ 2066.830352] --> ECS_IOCTL_GET_DELAY #3





    601
    
    
    





    602
    
    
    
<6>[ 2067.034759] --> ECS_IOCTL_SET_MODE #1





    603
    
    
    





    604
    
    
    
<6>[ 2067.035705] --> ECS_IOCTL_SET_MODE





    605
    
    
    





    606
    
    
    
<6>[ 2067.036163]  --> AKECS_MODE_MEASURE_SNG





    607
    
    
    





    608
    
    
    
<6>[ 2067.051818] --> ECS_IOCTL_GETDATA





    609
    
    
    





    610
    
    
    
<6>[ 2067.052764] --> ECS_IOCTL_GETDATA #3





    611
    
    
    





    612
    
    
    
<6>[ 2067.053253] --------------------





    613
    
    
    





    614
    
    
    
<6>[ 2067.053741] |	index	|	hdata	|	ddata	|





    615
    
    
    





    616
    
    
    
<6>[ 2067.054595] gflag1|	0	|	0x70	|	112	|





    617
    
    
    





    618
    
    
    
<6>[ 2067.055084] gflag1|	1	|	0x7f	|	127	|





    619
    
    
    





    620
    
    
    
<6>[ 2067.055572] gflag1|	2	|	0xa2	|	162	|





    621
    
    
    





    622
    
    
    
<6>[ 2067.056427] gflag1|	3	|	0x5d	|	93	|





    623
    
    
    





    624
    
    
    
<6>[ 2067.056915] gflag1|	4	|	0x65	|	101	|





    625
    
    
    





    626
    
    
    
<6>[ 2067.057373] gflag1|	5	|	0x86	|	134	|





    627
    
    
    





    628
    
    
    
<6>[ 2067.057861] gflag1|	6	|	0x5b	|	91	|





    629
    
    
    





    630
    
    
    
<6>[ 2067.058715] gflag1|	7	|	0x85	|	133	|





    631
    
    
    





    632
    
    
    
<6>[ 2067.059173] gflag1|	8	|	0x0	|	0	|





    633
    
    
    





    634
    
    
    
<6>[ 2067.059661] gflag1|	9	|	0x0	|	0	|





    635
    
    
    





    636
    
    
    
<6>[ 2067.060577] gflag1|	10	|	0x0	|	0	|





    637
    
    
    





    638
    
    
    
<6>[ 2067.061157] gflag1|	11	|	0x0	|	0	|





    639
    
    
    





    640
    
    
    
<6>[ 2067.061645] gflag1|	12	|	0x0	|	0	|





    641
    
    
    





    642
    
    
    
<6>[ 2067.062500] gflag1|	13	|	0x0	|	0	|





    643
    
    
    





    644
    
    
    
<6>[ 2067.062957] gflag1|	14	|	0x0	|	0	|





    645
    
    
    





    646
    
    
    
<6>[ 2067.063415] gflag1|	15	|	0x0	|	0	|





    647
    
    
    





    648
    
    
    
<6>[ 2067.063873] gflag1|	16	|	0x0	|	0	|





    649
    
    
    





    650
    
    
    
<6>[ 2067.064727] gflag1|	17	|	0xa2	|	162	|





    651
    
    
    





    652
    
    
    
<6>[ 2067.065185] gflag1|	18	|	0x5d	|	93	|





    653
    
    
    





    654
    
    
    
<6>[ 2067.065673] gflag1|	19	|	0x65	|	101	|





    655
    
    
    





    656
    
    
    
<6>[ 2067.066528] gflag1|	20	|	0x86	|	134	|





    657
    
    
    





    658
    
    
    
<6>[ 2067.067016] gflag1|	21	|	0x5b	|	91	|





    659
    
    
    





    660
    
    
    
<6>[ 2067.067474] gflag1|	22	|	0x85	|	133	|





    661
    
    
    





    662
    
    
    
<6>[ 2067.068328] gflag1|	23	|	0x0	|	0	|





    663
    
    
    





    664
    
    
    
<6>[ 2067.068817] gflag1|	24	|	0x0	|	0	|





    665
    
    
    





    666
    
    
    
<6>[ 2067.069274] gflag1|	25	|	0x0	|	0	|





    667
    
    
    





    668
    
    
    
<6>[ 2067.070129] gflag1|	26	|	0x0	|	0	|





    669
    
    
    





    670
    
    
    
<6>[ 2067.070587] gflag1|	27	|	0x0	|	0	|





    671
    
    
    





    672
    
    
    
<6>[ 2067.071136] gflag1|	28	|	0x0	|	0	|





    673
    
    
    





    674
    
    
    
<6>[ 2067.071624] gflag1|	29	|	0x0	|	0	|





    675
    
    
    





    676
    
    
    
<6>[ 2067.072479] gflag1|	30	|	0x0	|	0	|





    677
    
    
    





    678
    
    
    
<6>[ 2067.072937] gflag1|	31	|	0x0	|	0	|





    679
    
    
    





    680
    
    
    
<6>[ 2067.073394] ----------





    681
    
    
    





    682
    
    
    
<6>[ 2067.077880] --> ECS_IOCTL_GET_NUMFRQ





    683
    
    
    





    684
    
    
    
<6>[ 2067.078399] --> ECS_IOCTL_GET_NUMFRQ #3





    685
    
    
    





    686
    
    
    
<6>[ 2067.078857] --------------------





    687
    
    
    





    688
    
    
    
<6>[ 2067.079315] |	index	|	hdata	|	ddata	|





    689
    
    
    





    690
    
    
    
<6>[ 2067.080169] |	0	|	0x1	|	1	|





    691
    
    
    





    692
    
    
    
<6>[ 2067.080657] |	1	|	0x0	|	0	|





    693
    
    
    





    694
    
    
    
<6>[ 2067.081298] ----------





    695
    
    
    





    696
    
    
    
<6>[ 2067.083892] --> ECS_IOCTL_SET_YPR #1





    697
    
    
    





    698
    
    
    
<6>[ 2067.084869] --------------------





    699
    
    
    





    700
    
    
    
<6>[ 2067.085327] |	index	|	hdata	|	ddata	|





    701
    
    
    





    702
    
    
    
<6>[ 2067.085815] gflag2|	0	|	0x54	|	84	|





    703
    
    
    





    704
    
    
    
<6>[ 2067.086700] gflag2|	1	|	0xffffffff	|	-1	|





    705
    
    
    





    706
    
    
    
<6>[ 2067.087158] gflag2|	2	|	0x2	|	2	|





    707
    
    
    





    708
    
    
    
<6>[ 2067.087615] gflag2|	3	|	0x1e	|	30	|





    709
    
    
    





    710
    
    
    
<6>[ 2067.088470] gflag2|	4	|	0x1	|	1	|





    711
    
    
    





    712
    
    
    
<6>[ 2067.088928] gflag2|	5	|	0x0	|	0	|





    713
    
    
    





    714
    
    
    
<6>[ 2067.089416] gflag2|	6	|	0x14	|	20	|





    715
    
    
    





    716
    
    
    
<6>[ 2067.090270] gflag2|	7	|	0xfffffd2b	|	-725	|





    717
    
    
    





    718
    
    
    
<6>[ 2067.090728] gflag2|	8	|	0x11	|	17	|





    719
    
    
    





    720
    
    
    
<6>[ 2067.091400] gflag2|	9	|	0x175	|	373	|





    721
    
    
    





    722
    
    
    
<6>[ 2067.092254] gflag2|	10	|	0xffffffe7	|	-25	|





    723
    
    
    





    724
    
    
    
<6>[ 2067.092742] gflag2|	11	|	0xfffffdef	|	-529	|





    725
    
    
    





    726
    
    
    
<6>[ 2067.093231] ----------





    727
    
    
    





    728
    
    
    
<6>[ 2067.093688] --> ECS_IOCTL_SET_YPR





    729
    
    
    





    730
    
    
    
<6>[ 2067.094543] AKECS_Report_Value: yaw = 84, pitch = -1, roll = 2





    731
    
    
    





    732
    
    
    
<6>[ 2067.095031]                     tmp = 30, m_stat= 1, g_stat=0





    733
    
    
    





    734
    
    
    
<6>[ 2067.095916]           G_Sensor:   x = 20 LSB, y = -725 LSB, z = 17 LSB





    735
    
    
    





    736
    
    
    
<6>[ 2067.096405]                MAG:   MAGV_X = 373, MAGV_Y = -25, MAGV_Z = -529





    737
    
    
    
}}}





    738
    
    
    





    739
    
    
    





    740
    
    
    
=== Index of the things to know about the different ioctl commands ===





    741
    
    
    





    742
    
    
    
 * '''ECS_IOCTL_SET_MODE''': value is a short, must be one of the following values, as defined in akm8976.h:





    743
    
    
    
{{{





    744
    
    
    
#define AKECS_MODE_MEASURE	0x00	/* Starts measurement. Please use AKECS_MODE_MEASURE_SNG */





    745
    
    
    
					/* or AKECS_MODE_MEASURE_SEQ instead of this. */





    746
    
    
    
#define AKECS_MODE_PFFD		0x01	/* Start pedometer and free fall detect. */





    747
    
    
    
#define AKECS_MODE_E2P_READ	0x02	/* E2P access mode (read). */





    748
    
    
    
#define AKECS_MODE_POWERDOWN	0x03	/* Power down mode */





    749
    
    
    





    750
    
    
    
#define AKECS_MODE_MEASURE_SNG	0x10	/* Starts single measurement */





    751
    
    
    
#define AKECS_MODE_MEASURE_SEQ	0x11	/* Starts sequential measurement */





    752
    
    
    
}}}





    753
    
    
    
 * '''ECS_IOCTL_READ'''/'''ECS_IOCTL_WRITE''': value is a char table (called rwbuf on the kernel driver). rwbuf[0] is the length of the data and the data itself starts at rwbuf[1]. '''ECS_IOCTL_READ''' will give an answer to the request (on the same format) while '''ECS_IOCTL_WRITE''' won't. rwbuf is sent to the chip using I2C from the kernel driver.





    754
    
    
    





    755
    
    
    
=== Index of the files that are used by akmd or the kernel ===





    756
    
    
    





    757
    
    
    
 * '''/data/misc/akmd_set.txt''': it's the file containing the calibration values that akmd loads when it starts. If this file does not exist, akmd will re-create from the data it gets doing an ioctl system call to the kernel driver with ECS_IOCTL_GET_CALI_DATA. 





    758
    
    
    





    759
    
    
    
=== The initialization part ===





    760
    
    
    





    761
    
    
    
Let's take a look closer at the initialization part: this concerns everything before akmd starts reporting treated values.





    762
    
    
    





    763
    
    
    
So first of all, we have:





    764
    
    
    





    765
    
    
    
{{{





    766
    
    
    
<6>[ 2066.362670] --> ECS_IOCTL_SET_MODE #1





    767
    
    
    





    768
    
    
    
<6>[ 2066.363220] --> ECS_IOCTL_SET_MODE





    769
    
    
    





    770
    
    
    
<6>[ 2066.364074]  --> AKECS_MODE_E2P_READ





    771
    
    
    





    772
    
    
    
}}}





    773
    
    
    





    774
    
    
    
akmd sets the driver mode to AKECS_MODE_E2P_READ. It's not clear about why it's really necessary but it's there anyway, and it's quite easy to reproduce since there is no data treatment on that and that it's now clear that this call does not change depending of external values.





    775
    
    
    





    776
    
    
    
{{{





    777
    
    
    
<6>[ 2066.381042] --> ECS_IOCTL_READ #1





    778
    
    
    





    779
    
    
    
<6>[ 2066.381317] what is in rwbuf?





    780
    
    
    





    781
    
    
    
<6>[ 2066.381744] --------------------





    782
    
    
    





    783
    
    
    
<6>[ 2066.382019] |	index	|	hdata	|	ddata	|





    784
    
    
    





    785
    
    
    
<6>[ 2066.382263] |	0	|	0x1	|	1	|





    786
    
    
    





    787
    
    
    
<6>[ 2066.382507] |	1	|	0x42	|	66	|





    788
    
    
    





    789
    
    
    
<6>[ 2066.382934] |	2	|	0x0	|	0	|





    790
    
    
    





    791
    
    
    
<6>[ 2066.383178] |	3	|	0x0	|	0	|





    792
    
    
    





    793
    
    
    
<6>[ 2066.383392] |	4	|	0x0	|	0	|





    794
    
    
    





    795
    
    
    
<6>[ 2066.383636] ----------





    796
    
    
    





    797
    
    
    
<6>[ 2066.384063] --> ECS_IOCTL_READ





    798
    
    
    





    799
    
    
    
<6>[ 2066.384979] --> ECS_IOCTL_READ #3





    800
    
    
    





    801
    
    
    
<6>[ 2066.385253] --------------------





    802
    
    
    





    803
    
    
    
<6>[ 2066.385498] |	index	|	hdata	|	ddata	|





    804
    
    
    





    805
    
    
    
<6>[ 2066.385925] |	0	|	0x1	|	1	|





    806
    
    
    





    807
    
    
    
<6>[ 2066.386169] |	1	|	0x66	|	102	|





    808
    
    
    





    809
    
    
    
<6>[ 2066.386383] |	2	|	0x0	|	0	|





    810
    
    
    





    811
    
    
    
<6>[ 2066.386627] |	3	|	0x0	|	0	|





    812
    
    
    





    813
    
    
    
<6>[ 2066.387054] |	4	|	0x0	|	0	|





    814
    
    
    
}}}





    815
    
    
    





    816
    
    
    
This first part (ECS_IOCTL_READ #1) is the request (READ REQ #1) that akmd sends to the kernel and the second part (ECS_IOCTL_READ #3) is the answer (READ ASW #1) it gets. Its length is 1, so all the 0 values are not to be taken in count. 





    817
    
    
    
For this, the request is always { 1, 66 } but the answer may not be the same on different devices. 





    818
    
    
    





    819
    
    
    
Though, this value seems not to be used used for any of the next requests, but it may still be the case. 





    820
    
    
    





    821
    
    
    
{{{





    822
    
    
    
<6>[ 2066.387542] --> ECS_IOCTL_SET_MODE #1





    823
    
    
    





    824
    
    
    
<6>[ 2066.387786] --> ECS_IOCTL_SET_MODE





    825
    
    
    





    826
    
    
    
<6>[ 2066.388214]  --> AKECS_MODE_POWERDOWN





    827
    
    
    





    828
    
    
    
<6>[ 2066.401031] --> ECS_IOCTL_GET_OPEN_STATUS





    829
    
    
    





    830
    
    
    
<6>[ 2066.401306] --> ECS_IOCTL_GET_OPEN_STATUS #3





    831
    
    
    





    832
    
    
    
<6>[ 2066.407135] --> ECS_IOCTL_INIT





    833
    
    
    





    834
    
    
    
<6>[ 2066.408020] --> ECS_IOCTL_SET_MODE #1





    835
    
    
    





    836
    
    
    
<6>[ 2066.408294] --> ECS_IOCTL_SET_MODE





    837
    
    
    





    838
    
    
    
<6>[ 2066.408721]  --> AKECS_MODE_E2P_READ





    839
    
    
    
}}}





    840
    
    
    





    841
    
    
    
akmd sets the mode to AKECS_MODE_POWERDOWN, then waits for the kernel to have "open" status. This appears when the accelerometer/magnetometer is requested by the system, so if nothing requests the chip, ECS_IOCTL_GET_OPEN_STATUS





    842
    
    
    
 will block until the chip is requested. This also append when the phone is in "sleep" mode. 





    843
    
    
    





    844
    
    
    
When ECS_IOCTL_GET_OPEN_STATUS is not blocking (the chip is requested by the system), akmd asks the driver to init the chip, with ECS_IOCTL_INIT. Then, akmd sets the mode to AKECS_MODE_E2P_READ. The reason of that is still unclear.





    845
    
    
    





    846
    
    
    
All this is already implemented in akmd-free.





    847
    
    
    





    848
    
    
    
{{{





    849
    
    
    
<6>[ 2066.421234] --> ECS_IOCTL_READ #1





    850
    
    
    





    851
    
    
    
<6>[ 2066.421630] what is in rwbuf?





    852
    
    
    





    853
    
    
    
<6>[ 2066.422302] --------------------





    854
    
    
    





    855
    
    
    
<6>[ 2066.422637] |	index	|	hdata	|	ddata	|





    856
    
    
    





    857
    
    
    
<6>[ 2066.423004] |	0	|	0x3	|	3	|





    858
    
    
    





    859
    
    
    
<6>[ 2066.423339] |	1	|	0x46	|	70	|





    860
    
    
    





    861
    
    
    
<6>[ 2066.423950] |	2	|	0x0	|	0	|





    862
    
    
    





    863
    
    
    
<6>[ 2066.424285] |	3	|	0x0	|	0	|





    864
    
    
    





    865
    
    
    
<6>[ 2066.424621] |	4	|	0x0	|	0	|





    866
    
    
    





    867
    
    
    
<6>[ 2066.424957] ----------





    868
    
    
    





    869
    
    
    
<6>[ 2066.425567] --> ECS_IOCTL_READ





    870
    
    
    





    871
    
    
    
<6>[ 2066.426696] --> ECS_IOCTL_READ #3





    872
    
    
    





    873
    
    
    
<6>[ 2066.427062] --------------------





    874
    
    
    





    875
    
    
    
<6>[ 2066.427398] |	index	|	hdata	|	ddata	|





    876
    
    
    





    877
    
    
    
<6>[ 2066.428039] |	0	|	0x3	|	3	|





    878
    
    
    





    879
    
    
    
<6>[ 2066.428375] |	1	|	0x97	|	151	|





    880
    
    
    





    881
    
    
    
<6>[ 2066.428710] |	2	|	0x87	|	135	|





    882
    
    
    





    883
    
    
    
<6>[ 2066.429321] |	3	|	0x19	|	25	|





    884
    
    
    





    885
    
    
    
<6>[ 2066.429656] |	4	|	0x0	|	0	|





    886
    
    
    





    887
    
    
    
<6>[ 2066.429992] ----------





    888
    
    
    
}}}





    889
    
    
    





    890
    
    
    
Here we have a read request, with { 3, 70 } (READ REQ #2) that returns { 3, x, y, z } (READ ASW #2). The answer elements are called x, y, z since these are not constant and my change between devices. We'll refer to these values under the names: READ ASW #2's x, READ ASW #2's y and READ ASW #2's z.





    891
    
    
    





    892
    
    
    
{{{





    893
    
    
    
<6>[ 2066.431243] --> ECS_IOCTL_SET_MODE #1





    894
    
    
    





    895
    
    
    
<6>[ 2066.431915] --> ECS_IOCTL_SET_MODE





    896
    
    
    





    897
    
    
    
<6>[ 2066.432250]  --> AKECS_MODE_POWERDOWN





    898
    
    
    





    899
    
    
    
<6>[ 2066.450866] --> ECS_IOCTL_WRITE #1





    900
    
    
    





    901
    
    
    
<6>[ 2066.451385] what is in rwbuf?





    902
    
    
    





    903
    
    
    
<6>[ 2066.452239] --------------------





    904
    
    
    





    905
    
    
    
<6>[ 2066.452697] |	index	|	hdata	|	ddata	|





    906
    
    
    





    907
    
    
    
<6>[ 2066.453186] |	0	|	0x4	|	4	|





    908
    
    
    





    909
    
    
    
<6>[ 2066.454040] |	1	|	0xe8	|	232	|





    910
    
    
    





    911
    
    
    
<6>[ 2066.454498] |	2	|	0x7	|	7	|





    912
    
    
    





    913
    
    
    
<6>[ 2066.454956] |	3	|	0x7	|	7	|





    914
    
    
    





    915
    
    
    
<6>[ 2066.455413] |	4	|	0x9	|	9	|





    916
    
    
    





    917
    
    
    
<6>[ 2066.456268] ----------





    918
    
    
    





    919
    
    
    
<6>[ 2066.456726] --> ECS_IOCTL_WRITE





    920
    
    
    
}}}





    921
    
    
    





    922
    
    
    
Here akmd sets the mode to AKECS_MODE_POWERDOWN and writes 4 numbers { 4, 232, x, y, z } to the kernel driver. rwbuf[1] is always 232 but the other numbers are changing depending on READ ASW #2's values. The formula to get x, y and z from READ ASW #2's values is:





    923
    
    
    
x = (READ ASW #2's x) % 16





    924
    
    
    
y = (READ ASW #2's y) % 16





    925
    
    
    
z = (READ ASW #2's y) % 16





    926
    
    
    





    927
    
    
    
The way to discover that was to determine what makes these values change and how they change depending on READ ASW #2's values. This was easy since the values are also printed in hex format, so (READ ASW #2's x) % 16 is the last number of the hex representation of READ ASW #2's x. 





    928
    
    
    





    929
    
    
    
{{{





    930
    
    
    
<6>[ 2066.457916] --> ECS_IOCTL_WRITE #1





    931
    
    
    





    932
    
    
    
<6>[ 2066.458374] what is in rwbuf?





    933
    
    
    





    934
    
    
    
<6>[ 2066.459228] --------------------





    935
    
    
    





    936
    
    
    
<6>[ 2066.459686] |	index	|	hdata	|	ddata	|





    937
    
    
    





    938
    
    
    
<6>[ 2066.460174] |	0	|	0x4	|	4	|





    939
    
    
    





    940
    
    
    
<6>[ 2066.460784] |	1	|	0xe5	|	229	|





    941
    
    
    





    942
    
    
    
<6>[ 2066.461669] |	2	|	0x89	|	137	|





    943
    
    
    





    944
    
    
    
<6>[ 2066.462127] |	3	|	0x0	|	0	|





    945
    
    
    





    946
    
    
    
<6>[ 2066.462615] |	4	|	0x89	|	137	|





    947
    
    
    





    948
    
    
    
<6>[ 2066.463073] ----------





    949
    
    
    





    950
    
    
    
<6>[ 2066.463928] --> ECS_IOCTL_WRITE





    951
    
    
    
<6>[ 2066.465698] --> ECS_IOCTL_SET_MODE #1





    952
    
    
    





    953
    
    
    
<6>[ 2066.466186] --> ECS_IOCTL_SET_MODE





    954
    
    
    





    955
    
    
    
<6>[ 2066.467071]  --> AKECS_MODE_MEASURE_SNG





    956
    
    
    
}}}





    957
    
    
    





    958
    
    
    
Here is a write request of the type { 4, 229, x, y, z }. x, y and z values seem to be written to ''akmd_set_values.txt'' when akmd quits (this should be confirmed), so on the first start of akmd, x, y and z are 0 since there was no previous session to write the numbers on ''akmd_set_values.txt''.





    959
    
    
    





    960
    
    
    
Anyway, setting x, y and z to 0 doesn't prevent anything to work. 





    961
    
    
    





    962
    
    
    
Then akmd also sets the mode to AKECS_MODE_MEASURE_SNG.