iio: mma8452: Use correct acceleration units.

The userspace interface for acceleration sensors is documented as using
m/s^2 units [Documentation/ABI/testing/sysfs-bus-iio]

The fullscale raw value for the mma8452 (-2048) corresponds to -2G, -4G or -8G
depending on the seleted mode.

The scale table was converting to G rather than m/s^2.
Change the scaling table to match the documented interface.

Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: stable@vger.kernel.org

authored by Martin Fuzzey and committed by Jonathan Cameron 71702e6e 78b33216

Changed files
+7 -1
drivers
iio
accel
+7 -1
drivers/iio/accel/mma8452.c
··· 111 111 {6, 250000}, {1, 560000} 112 112 }; 113 113 114 + /* 115 + * Hardware has fullscale of -2G, -4G, -8G corresponding to raw value -2048 116 + * The userspace interface uses m/s^2 and we declare micro units 117 + * So scale factor is given by: 118 + * g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665 119 + */ 114 120 static const int mma8452_scales[3][2] = { 115 - {0, 977}, {0, 1953}, {0, 3906} 121 + {0, 9577}, {0, 19154}, {0, 38307} 116 122 }; 117 123 118 124 static ssize_t mma8452_show_samp_freq_avail(struct device *dev,