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Jean Delvare
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git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1898 7894878c-1315-0410-8ee3-d5d059ff63e0
82 lines
2.7 KiB
Plaintext
82 lines
2.7 KiB
Plaintext
Kernel driver `saa1064.o'
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========================
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Status: Testing;
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Supported chips:
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* Philips SAA1064
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Prefix: `saa1064'
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Addresses scanned: I2C 0x38 - 0x3b (inclusive)
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Datasheet: Publicly available at the Philips Semiconductor website
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http://semiconductors.philips.com/
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http://www.philipslogic.com/products/i2c/pdf/saa1064.pdf
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Author: Sascha Volkenandt <sascha@akv-soft.de>
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Module Parameters
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-----------------
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* force: short array (min = 1, max = 48)
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List of adapter,address pairs to boldly assume to be present
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* force_saa1064: short array (min = 1, max = 48)
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List of adapter,address pairs which are unquestionably assumed to
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contain a `saa1064' chip
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* ignore: short array (min = 1, max = 48)
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List of adapter,address pairs not to scan
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* ignore_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples not to scan
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* probe: short array (min = 1, max = 48)
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List of adapter,address pairs to scan additionally
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* probe_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples to scan additionally
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Description
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-----------
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The SAA1064 is a 4-digit LED driver chip for the I2C bus produced by Philips
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Semiconductors. It is designed to provide a byte I2C interface to up to 4
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separate 4-digit displays (16 digits).
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This device has eight write-only registers, five are used for a control byte
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and the four digit values.
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For more informations see the datasheet.
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Accessing SAA1064 via /proc interface
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-------------------------------------
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On detection (i.e. insmod, modprobe et al.), directories are being
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created for each detected SAA1064:
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/proc/sys/dev/sensors/saa1064-<0>-<1>/
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where <0> is the bus the chip was detected on (e. g. i2c-0)
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and <1> the chip address ([38..3b]):
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./saa1064-i2c-0-38/
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Inside these directories, there are four files each:
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bright, test, disp and refresh
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The bright, test and disp files are read-write.
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Writing bright sets the output current to the LEDs connected to the
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chip and thus the brightness. Range is from 0 to 7 (inclusive). Reading
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gives you the last known value.
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Writing test sets the segment test mode (all LEDs lit regardless of
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the digit values) on/off (values 0/1). Reading gives you the last
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known value.
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Writing up to four values to disp sets the digits. Each value represents
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one segment, while each bit represents one LED of the segment (seven bars
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and one dot usually). Reading gives you the last known value.
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The refresh file is read-only. You can't read anything from it, but
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reading it will trigger a refresh in case a power-loss has occurred since
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the last refresh.
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On module initialization the chip is configured for segment test (test=1),
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full brightness (bright=7), all digit values zeroed.
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