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TSLLUX(4)                    Device Drivers Manual                   TSLLUX(4)

NAME
     tsllux - Taos TSL256x Light-to-Digital Coverter

SYNOPSIS
     tsllux* at iic? addr 0x29 flags 0x0
     tsllux* at iic? addr 0x39 flags 0x0
     tsllux* at iic? addr 0x49 flags 0x0

DESCRIPTION
     The tsllux driver provides support for the Taos TSL2560 and TSL2561
     light-to-digital converter (ambient light sensor) with the envsys(4) API.

     The TSL2560 is designed to work with SMBus at 100 kHz.  The TSL2561 is
     designed to work with I2C Fast-Mode at 400 kHz.  The sensors come in a
     variety of packages, including 6-lead Chipscale (CS), 6-lead TMB (T),
     dual flat no-lead (FN), and 6-lead ChipLED (CL).  The `CS' package
     requires a different set of coefficients for calculating the Lux value
     from the raw sensor data.  This behavior is enabled by specifying the
     flag 0x1 in the kernel configuration file or by using a sysctl(8)
     variable; see below.

     The tsllux driver exports some sysctl(8) variables to control the
     behavior of the sensor and driver:

     hw.tsllux0.cs_package (boolean, read-write)
         This variable indicates if the driver instance has been configured to
         use the coeffecients appropriate for the `CS' package variant.

     hw.tsllux0.auto_gain (boolean, read-write)
         This variable indicates if the driver has been configured to use an
         auto-gain algorithm to improve sensitivity of the sensor while taking
         care to avoid sensor saturation.  Auto-gain is disabled by default.

     hw.tsllux0.gain (integer, read-write)
         This variable indicates the selected sensor gain.  If auto-gain is
         enabled, this will reflect the current gain setting selected by the
         auto-gain algorithm.  Otherwise, it reflects the previously-
         configured gain.  Valid values are 1 and 16.  The default gain is 1.
         Writing to this variable implicitly disables auto-gain.

     hw.tsllux0.integration_time (integer, read-write)
         This variable indicates the selected analog-to-digital converter
         integration time.  Longer integration times correspond to more
         accurate readings, at the cost of more costly read operation.  Valid
         values are 13 (13.7ms), 101 (101ms), and 402 (402ms).  The default
         value is 101.  Note that that due to the granularity of sleep timing
         in the kernel, the tsllux driver will busy-wait for wait times less
         than 1 Hz, and add an additional sleep clock tick for wait times
         greater than 1 Hz.  See hz(9).

SEE ALSO
     envsys(4), iic(4)

HISTORY
     The tsllux driver first appeared in NetBSD 9.0.

AUTHORS
     The tsllux driver was written by Jason R Thorpe <thorpej@NetBSD.org>.

BUGS
     The driver does not currently support the sensor's interrupt features or
     the sensor's manual integration timing feature.

NetBSD 8.99.34                   May 21, 2018                   NetBSD 8.99.34