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AKM8976A » History » Version 11

Paul Kocialkowski, 07/04/2011 09:16 PM

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>[ 2066.484100] gflag1|	2	|	0xa5	|	165	|





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





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<6>[ 2066.485046] gflag1|	4	|	0x66	|	102	|





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<6>[ 2066.485900] gflag1|	5	|	0x85	|	133	|





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<6>[ 2066.486450] gflag1|	6	|	0x5c	|	92	|





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<6>[ 2066.486938] gflag1|	7	|	0x85	|	133	|





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<6>[ 2066.487792] gflag1|	8	|	0x0	|	0	|





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<6>[ 2066.488250] gflag1|	9	|	0x0	|	0	|





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<6>[ 2066.488708] gflag1|	10	|	0x0	|	0	|





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<6>[ 2066.489196] gflag1|	11	|	0x0	|	0	|





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<6>[ 2066.490051] gflag1|	12	|	0x0	|	0	|





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<6>[ 2066.490631] gflag1|	13	|	0x0	|	0	|





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<6>[ 2066.491119] gflag1|	14	|	0x0	|	0	|





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<6>[ 2066.491973] gflag1|	15	|	0x0	|	0	|





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<6>[ 2066.492431] gflag1|	16	|	0x0	|	0	|





    178
    
    
    
<6>[ 2066.492919] gflag1|	17	|	0xa5	|	165	|





    179
    
    
    
<6>[ 2066.493774] gflag1|	18	|	0x5c	|	92	|





    180
    
    
    
<6>[ 2066.494262] gflag1|	19	|	0x66	|	102	|





    181
    
    
    
<6>[ 2066.494720] gflag1|	20	|	0x85	|	133	|





    182
    
    
    
<6>[ 2066.495574] gflag1|	21	|	0x5c	|	92	|





    183
    
    
    
<6>[ 2066.496032] gflag1|	22	|	0x85	|	133	|





    184
    
    
    
<6>[ 2066.496520] gflag1|	23	|	0x0	|	0	|





    185
    
    
    
<6>[ 2066.496978] gflag1|	24	|	0x0	|	0	|





    186
    
    
    
<6>[ 2066.497833] gflag1|	25	|	0x0	|	0	|





    187
    
    
    
<6>[ 2066.498291] gflag1|	26	|	0x0	|	0	|





    188
    
    
    
<6>[ 2066.498779] gflag1|	27	|	0x0	|	0	|





    189
    
    
    
<6>[ 2066.499633] gflag1|	28	|	0x0	|	0	|





    190
    
    
    
<6>[ 2066.500122] gflag1|	29	|	0x0	|	0	|





    191
    
    
    
<6>[ 2066.500671] gflag1|	30	|	0x0	|	0	|





    192
    
    
    
<6>[ 2066.501525] gflag1|	31	|	0x0	|	0	|





    193
    
    
    
<6>[ 2066.501983] ----------





    194
    
    
    
<6>[ 2066.509826] --> ECS_IOCTL_GET_NUMFRQ





    195
    
    
    
<6>[ 2066.510559] --> ECS_IOCTL_GET_NUMFRQ #3





    196
    
    
    
<6>[ 2066.511444] --------------------





    197
    
    
    
<6>[ 2066.511901] |	index	|	hdata	|	ddata	|





    198
    
    
    
<6>[ 2066.512390] |	0	|	0x1	|	1	|





    199
    
    
    
<6>[ 2066.513244] |	1	|	0x0	|	0	|





    200
    
    
    
<6>[ 2066.513702] ----------





    201
    
    
    
<6>[ 2066.515655] --> ECS_IOCTL_WRITE #1





    202
    
    
    
<6>[ 2066.516174] what is in rwbuf?





    203
    
    
    
<6>[ 2066.517120] --------------------





    204
    
    
    
<6>[ 2066.517578] |	index	|	hdata	|	ddata	|





    205
    
    
    
<6>[ 2066.518066] |	0	|	0x4	|	4	|





    206
    
    
    
<6>[ 2066.518524] |	1	|	0xee	|	238	|





    207
    
    
    
<6>[ 2066.519378] |	2	|	0x10	|	16	|





    208
    
    
    
<6>[ 2066.519836] |	3	|	0x10	|	16	|





    209
    
    
    
<6>[ 2066.520324] |	4	|	0x10	|	16	|





    210
    
    
    
<6>[ 2066.520904] ----------





    211
    
    
    
<6>[ 2066.521789] --> ECS_IOCTL_WRITE





    212
    
    
    
<6>[ 2066.524230] --> ECS_IOCTL_WRITE #1





    213
    
    
    
<6>[ 2066.524749] what is in rwbuf?





    214
    
    
    
<6>[ 2066.525299] --------------------





    215
    
    
    
<6>[ 2066.526153] |	index	|	hdata	|	ddata	|





    216
    
    
    
<6>[ 2066.526641] |	0	|	0x4	|	4	|





    217
    
    
    
<6>[ 2066.527099] |	1	|	0xeb	|	235	|





    218
    
    
    
<6>[ 2066.527954] |	2	|	0x3	|	3	|





    219
    
    
    
<6>[ 2066.528411] |	3	|	0x7	|	7	|





    220
    
    
    
<6>[ 2066.528869] |	4	|	0x8a	|	138	|





    221
    
    
    
<6>[ 2066.529357] ----------





    222
    
    
    
<6>[ 2066.529815] --> ECS_IOCTL_WRITE





    223
    
    
    
<6>[ 2066.532836] --> ECS_IOCTL_WRITE #1





    224
    
    
    
<6>[ 2066.533355] what is in rwbuf?





    225
    
    
    
<6>[ 2066.533874] --------------------





    226
    
    
    
<6>[ 2066.534729] |	index	|	hdata	|	ddata	|





    227
    
    
    
<6>[ 2066.535186] |	0	|	0x2	|	2	|





    228
    
    
    
<6>[ 2066.535675] |	1	|	0xf4	|	244	|





    229
    
    
    
<6>[ 2066.536132] |	2	|	0x55	|	85	|





    230
    
    
    
<6>[ 2066.537017] |	3	|	0x0	|	0	|





    231
    
    
    
<6>[ 2066.537475] |	4	|	0x0	|	0	|





    232
    
    
    
<6>[ 2066.537933] ----------





    233
    
    
    
<6>[ 2066.538391] --> ECS_IOCTL_WRITE





    234
    
    
    
<6>[ 2066.539947] --> ECS_IOCTL_WRITE #1





    235
    
    
    
<6>[ 2066.540618] what is in rwbuf?





    236
    
    
    
<6>[ 2066.541107] --------------------





    237
    
    
    
<6>[ 2066.541534] |	index	|	hdata	|	ddata	|





    238
    
    
    
<6>[ 2066.542388] |	0	|	0x2	|	2	|





    239
    
    
    
<6>[ 2066.542877] |	1	|	0xf5	|	245	|





    240
    
    
    
<6>[ 2066.543334] |	2	|	0x1b	|	27	|





    241
    
    
    
<6>[ 2066.544219] |	3	|	0x0	|	0	|





    242
    
    
    
<6>[ 2066.544677] |	4	|	0x0	|	0	|





    243
    
    
    
<6>[ 2066.545135] ----------





    244
    
    
    
<6>[ 2066.545623] --> ECS_IOCTL_WRITE





    245
    
    
    
<6>[ 2066.548126] --> ECS_IOCTL_WRITE #1





    246
    
    
    
<6>[ 2066.548370] what is in rwbuf?





    247
    
    
    
<6>[ 2066.548614] --------------------





    248
    
    
    
<6>[ 2066.548858] |	index	|	hdata	|	ddata	|





    249
    
    
    
<6>[ 2066.549285] |	0	|	0x2	|	2	|





    250
    
    
    
<6>[ 2066.549530] |	1	|	0xf6	|	246	|





    251
    
    
    
<6>[ 2066.549743] |	2	|	0x8	|	8	|





    252
    
    
    
<6>[ 2066.549987] |	3	|	0x0	|	0	|





    253
    
    
    
<6>[ 2066.550537] |	4	|	0x0	|	0	|





    254
    
    
    
<6>[ 2066.550781] ----------





    255
    
    
    
<6>[ 2066.551025] --> ECS_IOCTL_WRITE





    256
    
    
    
<6>[ 2066.552398] --> ECS_IOCTL_WRITE #1





    257
    
    
    
<6>[ 2066.552856] what is in rwbuf?





    258
    
    
    
<6>[ 2066.553131] --------------------





    259
    
    
    
<6>[ 2066.553375] |	index	|	hdata	|	ddata	|





    260
    
    
    
<6>[ 2066.553802] |	0	|	0x4	|	4	|





    261
    
    
    
<6>[ 2066.554046] |	1	|	0xf1	|	241	|





    262
    
    
    
<6>[ 2066.554260] |	2	|	0x84	|	132	|





    263
    
    
    
<6>[ 2066.554504] |	3	|	0x87	|	135	|





    264
    
    
    
<6>[ 2066.554931] |	4	|	0x83	|	131	|





    265
    
    
    
<6>[ 2066.555145] ----------





    266
    
    
    
<6>[ 2066.555389] --> ECS_IOCTL_WRITE





    267
    
    
    
<6>[ 2066.557525] --> ECS_IOCTL_GET_CLOSE_STATUS





    268
    
    
    
<6>[ 2066.558074] --> ECS_IOCTL_GET_DELAY





    269
    
    
    
<6>[ 2066.558319] --> ECS_IOCTL_GET_DELAY #3





    270
    
    
    
<6>[ 2066.761016] --> ECS_IOCTL_SET_MODE #1





    271
    
    
    
<6>[ 2066.761932] --> ECS_IOCTL_SET_MODE





    272
    
    
    
<6>[ 2066.762420]  --> AKECS_MODE_MEASURE_SNG





    273
    
    
    
<6>[ 2066.781555] --> ECS_IOCTL_GETDATA





    274
    
    
    
<6>[ 2066.782531] --> ECS_IOCTL_GETDATA #3





    275
    
    
    
<6>[ 2066.783020] --------------------





    276
    
    
    
<6>[ 2066.783477] |	index	|	hdata	|	ddata	|





    277
    
    
    
<6>[ 2066.783935] gflag1|	0	|	0x70	|	112	|





    278
    
    
    
<6>[ 2066.784820] gflag1|	1	|	0x7f	|	127	|





    279
    
    
    
<6>[ 2066.785278] gflag1|	2	|	0xa3	|	163	|





    280
    
    
    
<6>[ 2066.785766] gflag1|	3	|	0x5d	|	93	|





    281
    
    
    
<6>[ 2066.786621] gflag1|	4	|	0x68	|	104	|





    282
    
    
    
<6>[ 2066.787078] gflag1|	5	|	0x86	|	134	|





    283
    
    
    
<6>[ 2066.787567] gflag1|	6	|	0x5c	|	92	|





    284
    
    
    
<6>[ 2066.788421] gflag1|	7	|	0x85	|	133	|





    285
    
    
    
<6>[ 2066.788879] gflag1|	8	|	0x0	|	0	|





    286
    
    
    
<6>[ 2066.789367] gflag1|	9	|	0x0	|	0	|





    287
    
    
    
<6>[ 2066.790222] gflag1|	10	|	0x0	|	0	|





    288
    
    
    
<6>[ 2066.790832] gflag1|	11	|	0x0	|	0	|





    289
    
    
    
<6>[ 2066.791320] gflag1|	12	|	0x0	|	0	|





    290
    
    
    
<6>[ 2066.791778] gflag1|	13	|	0x0	|	0	|





    291
    
    
    
<6>[ 2066.792663] gflag1|	14	|	0x0	|	0	|





    292
    
    
    
<6>[ 2066.793121] gflag1|	15	|	0x0	|	0	|





    293
    
    
    
<6>[ 2066.793579] gflag1|	16	|	0x0	|	0	|





    294
    
    
    
<6>[ 2066.794464] gflag1|	17	|	0xa3	|	163	|





    295
    
    
    
<6>[ 2066.794921] gflag1|	18	|	0x5d	|	93	|





    296
    
    
    
<6>[ 2066.795379] gflag1|	19	|	0x68	|	104	|





    297
    
    
    
<6>[ 2066.796264] gflag1|	20	|	0x86	|	134	|





    298
    
    
    
<6>[ 2066.796722] gflag1|	21	|	0x5c	|	92	|





    299
    
    
    
<6>[ 2066.797210] gflag1|	22	|	0x85	|	133	|





    300
    
    
    
<6>[ 2066.798065] gflag1|	23	|	0x0	|	0	|





    301
    
    
    
<6>[ 2066.798553] gflag1|	24	|	0x0	|	0	|





    302
    
    
    
<6>[ 2066.799041] gflag1|	25	|	0x0	|	0	|





    303
    
    
    
<6>[ 2066.799499] gflag1|	26	|	0x0	|	0	|





    304
    
    
    
<6>[ 2066.800354] gflag1|	27	|	0x0	|	0	|





    305
    
    
    
<6>[ 2066.800903] gflag1|	28	|	0x0	|	0	|





    306
    
    
    
<6>[ 2066.801391] gflag1|	29	|	0x0	|	0	|





    307
    
    
    
<6>[ 2066.802246] gflag1|	30	|	0x0	|	0	|





    308
    
    
    
<6>[ 2066.802703] gflag1|	31	|	0x0	|	0	|





    309
    
    
    
<6>[ 2066.803161] ----------





    310
    
    
    
<6>[ 2066.807067] --> ECS_IOCTL_GET_NUMFRQ





    311
    
    
    
<6>[ 2066.808044] --> ECS_IOCTL_GET_NUMFRQ #3





    312
    
    
    
<6>[ 2066.808502] --------------------





    313
    
    
    
<6>[ 2066.808959] |	index	|	hdata	|	ddata	|





    314
    
    
    
<6>[ 2066.809814] |	0	|	0x1	|	1	|





    315
    
    
    
<6>[ 2066.810302] |	1	|	0x0	|	0	|





    316
    
    
    
<6>[ 2066.810943] ----------





    317
    
    
    
<6>[ 2066.813629] --> ECS_IOCTL_SET_YPR #1





    318
    
    
    
<6>[ 2066.814636] --------------------





    319
    
    
    
<6>[ 2066.815093] |	index	|	hdata	|	ddata	|





    320
    
    
    
<6>[ 2066.815582] gflag2|	0	|	0x55	|	85	|





    321
    
    
    
<6>[ 2066.816467] gflag2|	1	|	0xffffffff	|	-1	|





    322
    
    
    
<6>[ 2066.816925] gflag2|	2	|	0x2	|	2	|





    323
    
    
    
<6>[ 2066.817382] gflag2|	3	|	0x1e	|	30	|





    324
    
    
    
<6>[ 2066.817840] gflag2|	4	|	0x1	|	1	|





    325
    
    
    
<6>[ 2066.818328] gflag2|	5	|	0x0	|	0	|





    326
    
    
    
<6>[ 2066.818786] gflag2|	6	|	0x14	|	20	|





    327
    
    
    
<6>[ 2066.819244] gflag2|	7	|	0xfffffd3b	|	-709	|





    328
    
    
    
<6>[ 2066.820129] gflag2|	8	|	0x11	|	17	|





    329
    
    
    
<6>[ 2066.820770] gflag2|	9	|	0x185	|	389	|





    330
    
    
    
<6>[ 2066.821258] gflag2|	10	|	0xffffffe7	|	-25	|





    331
    
    
    
<6>[ 2066.822113] gflag2|	11	|	0xfffffe20	|	-480	|





    332
    
    
    
<6>[ 2066.822570] ----------





    333
    
    
    
<6>[ 2066.823028] --> ECS_IOCTL_SET_YPR





    334
    
    
    
<6>[ 2066.823913] AKECS_Report_Value: yaw = 85, pitch = -1, roll = 2





    335
    
    
    
<6>[ 2066.824401]                     tmp = 30, m_stat= 1, g_stat=0





    336
    
    
    
<6>[ 2066.825286]           G_Sensor:   x = 20 LSB, y = -709 LSB, z = 17 LSB





    337
    
    
    
<6>[ 2066.825744]                MAG:   MAGV_X = 389, MAGV_Y = -25, MAGV_Z = -480





    338
    
    
    
<6>[ 2066.829833] --> ECS_IOCTL_GET_DELAY





    339
    
    
    
<6>[ 2066.830352] --> ECS_IOCTL_GET_DELAY #3





    340
    
    
    
<6>[ 2067.034759] --> ECS_IOCTL_SET_MODE #1





    341
    
    
    
<6>[ 2067.035705] --> ECS_IOCTL_SET_MODE





    342
    
    
    
<6>[ 2067.036163]  --> AKECS_MODE_MEASURE_SNG





    343
    
    
    
<6>[ 2067.051818] --> ECS_IOCTL_GETDATA





    344
    
    
    
<6>[ 2067.052764] --> ECS_IOCTL_GETDATA #3





    345
    
    
    
<6>[ 2067.053253] --------------------





    346
    
    
    
<6>[ 2067.053741] |	index	|	hdata	|	ddata	|





    347
    
    
    
<6>[ 2067.054595] gflag1|	0	|	0x70	|	112	|





    348
    
    
    
<6>[ 2067.055084] gflag1|	1	|	0x7f	|	127	|





    349
    
    
    
<6>[ 2067.055572] gflag1|	2	|	0xa2	|	162	|





    350
    
    
    
<6>[ 2067.056427] gflag1|	3	|	0x5d	|	93	|





    351
    
    
    
<6>[ 2067.056915] gflag1|	4	|	0x65	|	101	|





    352
    
    
    
<6>[ 2067.057373] gflag1|	5	|	0x86	|	134	|





    353
    
    
    
<6>[ 2067.057861] gflag1|	6	|	0x5b	|	91	|





    354
    
    
    
<6>[ 2067.058715] gflag1|	7	|	0x85	|	133	|





    355
    
    
    
<6>[ 2067.059173] gflag1|	8	|	0x0	|	0	|





    356
    
    
    
<6>[ 2067.059661] gflag1|	9	|	0x0	|	0	|





    357
    
    
    
<6>[ 2067.060577] gflag1|	10	|	0x0	|	0	|





    358
    
    
    
<6>[ 2067.061157] gflag1|	11	|	0x0	|	0	|





    359
    
    
    
<6>[ 2067.061645] gflag1|	12	|	0x0	|	0	|





    360
    
    
    
<6>[ 2067.062500] gflag1|	13	|	0x0	|	0	|





    361
    
    
    
<6>[ 2067.062957] gflag1|	14	|	0x0	|	0	|





    362
    
    
    
<6>[ 2067.063415] gflag1|	15	|	0x0	|	0	|





    363
    
    
    
<6>[ 2067.063873] gflag1|	16	|	0x0	|	0	|





    364
    
    
    
<6>[ 2067.064727] gflag1|	17	|	0xa2	|	162	|





    365
    
    
    
<6>[ 2067.065185] gflag1|	18	|	0x5d	|	93	|





    366
    
    
    
<6>[ 2067.065673] gflag1|	19	|	0x65	|	101	|





    367
    
    
    
<6>[ 2067.066528] gflag1|	20	|	0x86	|	134	|





    368
    
    
    
<6>[ 2067.067016] gflag1|	21	|	0x5b	|	91	|





    369
    
    
    
<6>[ 2067.067474] gflag1|	22	|	0x85	|	133	|





    370
    
    
    
<6>[ 2067.068328] gflag1|	23	|	0x0	|	0	|





    371
    
    
    
<6>[ 2067.068817] gflag1|	24	|	0x0	|	0	|





    372
    
    
    
<6>[ 2067.069274] gflag1|	25	|	0x0	|	0	|





    373
    
    
    
<6>[ 2067.070129] gflag1|	26	|	0x0	|	0	|





    374
    
    
    
<6>[ 2067.070587] gflag1|	27	|	0x0	|	0	|





    375
    
    
    
<6>[ 2067.071136] gflag1|	28	|	0x0	|	0	|





    376
    
    
    
<6>[ 2067.071624] gflag1|	29	|	0x0	|	0	|





    377
    
    
    
<6>[ 2067.072479] gflag1|	30	|	0x0	|	0	|





    378
    
    
    
<6>[ 2067.072937] gflag1|	31	|	0x0	|	0	|





    379
    
    
    
<6>[ 2067.073394] ----------





    380
    
    
    
<6>[ 2067.077880] --> ECS_IOCTL_GET_NUMFRQ





    381
    
    
    
<6>[ 2067.078399] --> ECS_IOCTL_GET_NUMFRQ #3





    382
    
    
    
<6>[ 2067.078857] --------------------





    383
    
    
    
<6>[ 2067.079315] |	index	|	hdata	|	ddata	|





    384
    
    
    
<6>[ 2067.080169] |	0	|	0x1	|	1	|





    385
    
    
    
<6>[ 2067.080657] |	1	|	0x0	|	0	|





    386
    
    
    
<6>[ 2067.081298] ----------





    387
    
    
    
<6>[ 2067.083892] --> ECS_IOCTL_SET_YPR #1





    388
    
    
    
<6>[ 2067.084869] --------------------





    389
    
    
    
<6>[ 2067.085327] |	index	|	hdata	|	ddata	|





    390
    
    
    
<6>[ 2067.085815] gflag2|	0	|	0x54	|	84	|





    391
    
    
    
<6>[ 2067.086700] gflag2|	1	|	0xffffffff	|	-1	|





    392
    
    
    
<6>[ 2067.087158] gflag2|	2	|	0x2	|	2	|





    393
    
    
    
<6>[ 2067.087615] gflag2|	3	|	0x1e	|	30	|





    394
    
    
    
<6>[ 2067.088470] gflag2|	4	|	0x1	|	1	|





    395
    
    
    
<6>[ 2067.088928] gflag2|	5	|	0x0	|	0	|





    396
    
    
    
<6>[ 2067.089416] gflag2|	6	|	0x14	|	20	|





    397
    
    
    
<6>[ 2067.090270] gflag2|	7	|	0xfffffd2b	|	-725	|





    398
    
    
    
<6>[ 2067.090728] gflag2|	8	|	0x11	|	17	|





    399
    
    
    
<6>[ 2067.091400] gflag2|	9	|	0x175	|	373	|





    400
    
    
    
<6>[ 2067.092254] gflag2|	10	|	0xffffffe7	|	-25	|





    401
    
    
    
<6>[ 2067.092742] gflag2|	11	|	0xfffffdef	|	-529	|





    402
    
    
    
<6>[ 2067.093231] ----------





    403
    
    
    
<6>[ 2067.093688] --> ECS_IOCTL_SET_YPR





    404
    
    
    
<6>[ 2067.094543] AKECS_Report_Value: yaw = 84, pitch = -1, roll = 2





    405
    
    
    
<6>[ 2067.095031]                     tmp = 30, m_stat= 1, g_stat=0





    406
    
    
    
<6>[ 2067.095916]           G_Sensor:   x = 20 LSB, y = -725 LSB, z = 17 LSB





    407
    
    
    
<6>[ 2067.096405]                MAG:   MAGV_X = 373, MAGV_Y = -25, MAGV_Z = -529





    408
    
    
    
}}}





    409
    
    
    





    410
    
    
    
=== Index of the things to know about the different ioctl commands ===





    411
    
    
    





    412
    
    
    
 * '''ECS_IOCTL_SET_MODE''': value is a short, must be one of the following values, as defined in akm8976.h:





    413
    
    
    
{{{





    414
    
    
    
#define AKECS_MODE_MEASURE	0x00	/* Starts measurement. Please use AKECS_MODE_MEASURE_SNG */





    415
    
    
    
					/* or AKECS_MODE_MEASURE_SEQ instead of this. */





    416
    
    
    
#define AKECS_MODE_PFFD		0x01	/* Start pedometer and free fall detect. */





    417
    
    
    
#define AKECS_MODE_E2P_READ	0x02	/* E2P access mode (read). */





    418
    
    
    
#define AKECS_MODE_POWERDOWN	0x03	/* Power down mode */





    419
    
    
    





    420
    
    
    
#define AKECS_MODE_MEASURE_SNG	0x10	/* Starts single measurement */





    421
    
    
    
#define AKECS_MODE_MEASURE_SEQ	0x11	/* Starts sequential measurement */





    422
    
    
    
}}}





    423
    
    
    
 * '''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.





    424
    
    
    





    425
    
    
    
=== Index of the files that are used by akmd or the kernel ===





    426
    
    
    





    427
    
    
    
 * '''/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. 





    428
    
    
    





    429
    
    
    
=== The initialization part ===





    430
    
    
    





    431
    
    
    
Let's take a look closer at the initialization part: this concerns everything before akmd starts reporting treated values.





    432
    
    
    





    433
    
    
    
So first of all, we have:





    434
    
    
    





    435
    
    
    
{{{





    436
    
    
    
<6>[ 2066.362670] --> ECS_IOCTL_SET_MODE #1





    437
    
    
    
<6>[ 2066.363220] --> ECS_IOCTL_SET_MODE





    438
    
    
    
<6>[ 2066.364074]  --> AKECS_MODE_E2P_READ





    439
    
    
    





    440
    
    
    
}}}





    441
    
    
    





    442
    
    
    
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.





    443
    
    
    





    444
    
    
    
{{{





    445
    
    
    
<6>[ 2066.381042] --> ECS_IOCTL_READ #1





    446
    
    
    
<6>[ 2066.381317] what is in rwbuf?





    447
    
    
    
<6>[ 2066.381744] --------------------





    448
    
    
    
<6>[ 2066.382019] |	index	|	hdata	|	ddata	|





    449
    
    
    
<6>[ 2066.382263] |	0	|	0x1	|	1	|





    450
    
    
    
<6>[ 2066.382507] |	1	|	0x42	|	66	|





    451
    
    
    
<6>[ 2066.382934] |	2	|	0x0	|	0	|





    452
    
    
    
<6>[ 2066.383178] |	3	|	0x0	|	0	|





    453
    
    
    
<6>[ 2066.383392] |	4	|	0x0	|	0	|





    454
    
    
    
<6>[ 2066.383636] ----------





    455
    
    
    
<6>[ 2066.384063] --> ECS_IOCTL_READ





    456
    
    
    
<6>[ 2066.384979] --> ECS_IOCTL_READ #3





    457
    
    
    
<6>[ 2066.385253] --------------------





    458
    
    
    
<6>[ 2066.385498] |	index	|	hdata	|	ddata	|





    459
    
    
    
<6>[ 2066.385925] |	0	|	0x1	|	1	|





    460
    
    
    
<6>[ 2066.386169] |	1	|	0x66	|	102	|





    461
    
    
    
<6>[ 2066.386383] |	2	|	0x0	|	0	|





    462
    
    
    
<6>[ 2066.386627] |	3	|	0x0	|	0	|





    463
    
    
    
<6>[ 2066.387054] |	4	|	0x0	|	0	|





    464
    
    
    
}}}





    465
    
    
    





    466
    
    
    
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. 





    467
    
    
    
For this, the request is always { 1, 66 } but the answer may not be the same on different devices. 





    468
    
    
    





    469
    
    
    
Though, this value seems not to be used used for any of the next requests, but it may still be the case. 





    470
    
    
    





    471
    
    
    
{{{





    472
    
    
    
<6>[ 2066.387542] --> ECS_IOCTL_SET_MODE #1





    473
    
    
    
<6>[ 2066.387786] --> ECS_IOCTL_SET_MODE





    474
    
    
    
<6>[ 2066.388214]  --> AKECS_MODE_POWERDOWN





    475
    
    
    
<6>[ 2066.401031] --> ECS_IOCTL_GET_OPEN_STATUS





    476
    
    
    
<6>[ 2066.401306] --> ECS_IOCTL_GET_OPEN_STATUS #3





    477
    
    
    
<6>[ 2066.407135] --> ECS_IOCTL_INIT





    478
    
    
    
<6>[ 2066.408020] --> ECS_IOCTL_SET_MODE #1





    479
    
    
    
<6>[ 2066.408294] --> ECS_IOCTL_SET_MODE





    480
    
    
    
<6>[ 2066.408721]  --> AKECS_MODE_E2P_READ





    481
    
    
    
}}}





    482
    
    
    





    483
    
    
    
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





    484
    
    
    
 will block until the chip is requested. This also append when the phone is in "sleep" mode. 





    485
    
    
    





    486
    
    
    
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.





    487
    
    
    





    488
    
    
    
All this is already implemented in akmd-free.





    489
    
    
    





    490
    
    
    
{{{





    491
    
    
    
<6>[ 2066.421234] --> ECS_IOCTL_READ #1





    492
    
    
    
<6>[ 2066.421630] what is in rwbuf?





    493
    
    
    
<6>[ 2066.422302] --------------------





    494
    
    
    
<6>[ 2066.422637] |	index	|	hdata	|	ddata	|





    495
    
    
    
<6>[ 2066.423004] |	0	|	0x3	|	3	|





    496
    
    
    
<6>[ 2066.423339] |	1	|	0x46	|	70	|





    497
    
    
    
<6>[ 2066.423950] |	2	|	0x0	|	0	|





    498
    
    
    
<6>[ 2066.424285] |	3	|	0x0	|	0	|





    499
    
    
    
<6>[ 2066.424621] |	4	|	0x0	|	0	|





    500
    
    
    
<6>[ 2066.424957] ----------





    501
    
    
    
<6>[ 2066.425567] --> ECS_IOCTL_READ





    502
    
    
    
<6>[ 2066.426696] --> ECS_IOCTL_READ #3





    503
    
    
    
<6>[ 2066.427062] --------------------





    504
    
    
    
<6>[ 2066.427398] |	index	|	hdata	|	ddata	|





    505
    
    
    
<6>[ 2066.428039] |	0	|	0x3	|	3	|





    506
    
    
    
<6>[ 2066.428375] |	1	|	0x97	|	151	|





    507
    
    
    
<6>[ 2066.428710] |	2	|	0x87	|	135	|





    508
    
    
    
<6>[ 2066.429321] |	3	|	0x19	|	25	|





    509
    
    
    
<6>[ 2066.429656] |	4	|	0x0	|	0	|





    510
    
    
    
<6>[ 2066.429992] ----------





    511
    
    
    
}}}





    512
    
    
    





    513
    
    
    
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.





    514
    
    
    





    515
    
    
    
{{{





    516
    
    
    
<6>[ 2066.431243] --> ECS_IOCTL_SET_MODE #1





    517
    
    
    
<6>[ 2066.431915] --> ECS_IOCTL_SET_MODE





    518
    
    
    
<6>[ 2066.432250]  --> AKECS_MODE_POWERDOWN





    519
    
    
    
<6>[ 2066.450866] --> ECS_IOCTL_WRITE #1





    520
    
    
    
<6>[ 2066.451385] what is in rwbuf?





    521
    
    
    
<6>[ 2066.452239] --------------------





    522
    
    
    
<6>[ 2066.452697] |	index	|	hdata	|	ddata	|





    523
    
    
    
<6>[ 2066.453186] |	0	|	0x4	|	4	|





    524
    
    
    
<6>[ 2066.454040] |	1	|	0xe8	|	232	|





    525
    
    
    
<6>[ 2066.454498] |	2	|	0x7	|	7	|





    526
    
    
    
<6>[ 2066.454956] |	3	|	0x7	|	7	|





    527
    
    
    
<6>[ 2066.455413] |	4	|	0x9	|	9	|





    528
    
    
    
<6>[ 2066.456268] ----------





    529
    
    
    
<6>[ 2066.456726] --> ECS_IOCTL_WRITE





    530
    
    
    
}}}





    531
    
    
    





    532
    
    
    
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:





    533
    
    
    
x = (READ ASW #2's x) % 16





    534
    
    
    
y = (READ ASW #2's y) % 16





    535
    
    
    
z = (READ ASW #2's y) % 16





    536
    
    
    





    537
    
    
    
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. 





    538
    
    
    





    539
    
    
    
{{{





    540
    
    
    
<6>[ 2066.457916] --> ECS_IOCTL_WRITE #1





    541
    
    
    
<6>[ 2066.458374] what is in rwbuf?





    542
    
    
    
<6>[ 2066.459228] --------------------





    543
    
    
    
<6>[ 2066.459686] |	index	|	hdata	|	ddata	|





    544
    
    
    
<6>[ 2066.460174] |	0	|	0x4	|	4	|





    545
    
    
    
<6>[ 2066.460784] |	1	|	0xe5	|	229	|





    546
    
    
    
<6>[ 2066.461669] |	2	|	0x89	|	137	|





    547
    
    
    
<6>[ 2066.462127] |	3	|	0x0	|	0	|





    548
    
    
    
<6>[ 2066.462615] |	4	|	0x89	|	137	|





    549
    
    
    
<6>[ 2066.463073] ----------





    550
    
    
    
<6>[ 2066.463928] --> ECS_IOCTL_WRITE





    551
    
    
    
<6>[ 2066.465698] --> ECS_IOCTL_SET_MODE #1





    552
    
    
    
<6>[ 2066.466186] --> ECS_IOCTL_SET_MODE





    553
    
    
    
<6>[ 2066.467071]  --> AKECS_MODE_MEASURE_SNG





    554
    
    
    
}}}





    555
    
    
    





    556
    
    
    
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''.





    557
    
    
    





    558
    
    
    
Anyway, setting x, y and z to 0 doesn't prevent anything to work. 





    559
    
    
    





    560
    
    
    
Then akmd also sets the mode to AKECS_MODE_MEASURE_SNG.