drivers/misc: support for the pressure sensor BMP085 from Bosch Sensortec
[linux-2.6.git] / Documentation / ABI / testing / sysfs-i2c-bmp085
1 What:           /sys/bus/i2c/devices/<busnum>-<devaddr>/pressure0_input
2 Date:           June 2010
3 Contact:        Christoph Mair <christoph.mair@gmail.com>
4 Description:    Start a pressure measurement and read the result. Values
5                 represent the ambient air pressure in pascal (0.01 millibar).
6
7                 Reading: returns the current air pressure.
8
9
10 What:           /sys/bus/i2c/devices/<busnum>-<devaddr>/temp0_input
11 Date:           June 2010
12 Contact:        Christoph Mair <christoph.mair@gmail.com>
13 Description:    Measure the ambient temperature. The returned value represents
14                 the ambient temperature in units of 0.1 degree celsius.
15
16                 Reading: returns the current temperature.
17
18
19 What:           /sys/bus/i2c/devices/<busnum>-<devaddr>/oversampling
20 Date:           June 2010
21 Contact:        Christoph Mair <christoph.mair@gmail.com>
22 Description:    Tell the bmp085 to use more samples to calculate a pressure
23                 value. When writing to this file the chip will use 2^x samples
24                 to calculate the next pressure value with x being the value
25                 written. Using this feature will decrease RMS noise and
26                 increase the measurement time.
27
28                 Reading: returns the current oversampling setting.
29
30                 Writing: sets a new oversampling setting.
31                 Accepted values: 0..3.