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Diffstat (limited to 'Documentation/i2c/chips/pca9539')
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diff --git a/Documentation/i2c/chips/pca9539 b/Documentation/i2c/chips/pca9539 new file mode 100644 index 0000000..6aff890 --- /dev/null +++ b/Documentation/i2c/chips/pca9539 @@ -0,0 +1,58 @@ +Kernel driver pca9539 +===================== + +NOTE: this driver is deprecated and will be dropped soon, use +drivers/gpio/pca9539.c instead. + +Supported chips: + * Philips PCA9539 + Prefix: 'pca9539' + Addresses scanned: none + Datasheet: + http://www.semiconductors.philips.com/acrobat/datasheets/PCA9539_2.pdf + +Author: Ben Gardner <bgardner@wabtec.com> + + +Description +----------- + +The Philips PCA9539 is a 16 bit low power I/O device. +All 16 lines can be individually configured as an input or output. +The input sense can also be inverted. +The 16 lines are split between two bytes. + + +Detection +--------- + +The PCA9539 is difficult to detect and not commonly found in PC machines, +so you have to pass the I2C bus and address of the installed PCA9539 +devices explicitly to the driver at load time via the force=... parameter. + + +Sysfs entries +------------- + +Each is a byte that maps to the 8 I/O bits. +A '0' suffix is for bits 0-7, while '1' is for bits 8-15. + +input[01] - read the current value +output[01] - sets the output value +direction[01] - direction of each bit: 1=input, 0=output +invert[01] - toggle the input bit sense + +input reads the actual state of the line and is always available. +The direction defaults to input for all channels. + + +General Remarks +--------------- + +Note that each output, direction, and invert entry controls 8 lines. +You should use the read, modify, write sequence. +For example. to set output bit 0 of 1. + val=$(cat output0) + val=$(( $val | 1 )) + echo $val > output0 + |
