linux/Documentation/input/cma3000_d0x.txt
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   1Kernel driver for CMA3000-D0x
   2============================
   3
   4Supported chips:
   5* VTI CMA3000-D0x
   6Datasheet:
   7  CMA3000-D0X Product Family Specification 8281000A.02.pdf
   8  <http://www.vti.fi/en/>
   9
  10Author: Hemanth V <hemanthv@ti.com>
  11
  12
  13Description
  14-----------
  15CMA3000 Tri-axis accelerometer supports Motion detect, Measurement and
  16Free fall modes.
  17
  18Motion Detect Mode: Its the low power mode where interrupts are generated only
  19when motion exceeds the defined thresholds.
  20
  21Measurement Mode: This mode is used to read the acceleration data on X,Y,Z
  22axis and supports 400, 100, 40 Hz sample frequency.
  23
  24Free fall Mode: This mode is intended to save system resources.
  25
  26Threshold values: Chip supports defining threshold values for above modes
  27which includes time and g value. Refer product specifications for more details.
  28
  29CMA3000 chip supports mutually exclusive I2C and SPI interfaces for
  30communication, currently the driver supports I2C based communication only.
  31Initial configuration for bus mode is set in non volatile memory and can later
  32be modified through bus interface command.
  33
  34Driver reports acceleration data through input subsystem. It generates ABS_MISC
  35event with value 1 when free fall is detected.
  36
  37Platform data need to be configured for initial default values.
  38
  39Platform Data
  40-------------
  41fuzz_x: Noise on X Axis
  42
  43fuzz_y: Noise on Y Axis
  44
  45fuzz_z: Noise on Z Axis
  46
  47g_range: G range in milli g i.e 2000 or 8000
  48
  49mode: Default Operating mode
  50
  51mdthr: Motion detect g range threshold value
  52
  53mdfftmr: Motion detect and free fall time threshold value
  54
  55ffthr: Free fall g range threshold value
  56
  57Input Interface
  58--------------
  59Input driver version is 1.0.0
  60Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
  61Input device name: "cma3000-accelerometer"
  62Supported events:
  63  Event type 0 (Sync)
  64  Event type 3 (Absolute)
  65    Event code 0 (X)
  66      Value     47
  67      Min    -8000
  68      Max     8000
  69      Fuzz     200
  70    Event code 1 (Y)
  71      Value    -28
  72      Min    -8000
  73      Max     8000
  74      Fuzz     200
  75    Event code 2 (Z)
  76      Value    905
  77      Min    -8000
  78      Max     8000
  79      Fuzz     200
  80    Event code 40 (Misc)
  81      Value      0
  82      Min        0
  83      Max        1
  84  Event type 4 (Misc)
  85
  86
  87Register/Platform parameters Description
  88----------------------------------------
  89
  90mode:
  91        0: power down mode
  92        1: 100 Hz Measurement mode
  93        2: 400 Hz Measurement mode
  94        3: 40 Hz Measurement mode
  95        4: Motion Detect mode (default)
  96        5: 100 Hz Free fall mode
  97        6: 40 Hz Free fall mode
  98        7: Power off mode
  99
 100grange:
 101        2000: 2000 mg or 2G Range
 102        8000: 8000 mg or 8G Range
 103
 104mdthr:
 105        X: X * 71mg (8G Range)
 106        X: X * 18mg (2G Range)
 107
 108mdfftmr:
 109        X: (X & 0x70) * 100 ms (MDTMR)
 110           (X & 0x0F) * 2.5 ms (FFTMR 400 Hz)
 111           (X & 0x0F) * 10 ms  (FFTMR 100 Hz)
 112
 113ffthr:
 114       X: (X >> 2) * 18mg (2G Range)
 115       X: (X & 0x0F) * 71 mg (8G Range)
 116
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