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| author | Markus Franke <franm@hrz.tu-chemnitz.de> | 2012-05-26 00:45:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-13 16:47:10 -0700 |
| commit | fbf7f7b4e2ae40f790828c86d31beff2d49e9ac8 (patch) | |
| tree | 101a1272b8f1ebdf948945ade2aa7cff1b9a7311 /Documentation/w1 | |
| parent | a59d6293e5372d7c35212932e083e2a541151eff (diff) | |
| download | linux-exynos-fbf7f7b4e2ae40f790828c86d31beff2d49e9ac8.tar.gz linux-exynos-fbf7f7b4e2ae40f790828c86d31beff2d49e9ac8.tar.bz2 linux-exynos-fbf7f7b4e2ae40f790828c86d31beff2d49e9ac8.zip | |
w1: Add 1-wire slave device driver for DS28E04-100
Signed-off-by: Markus Franke <franm@hrz.tu-chemnitz.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/w1')
| -rw-r--r-- | Documentation/w1/slaves/w1_ds28e04 | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/w1/slaves/w1_ds28e04 b/Documentation/w1/slaves/w1_ds28e04 new file mode 100644 index 000000000000..85bc9a7e02fe --- /dev/null +++ b/Documentation/w1/slaves/w1_ds28e04 @@ -0,0 +1,36 @@ +Kernel driver w1_ds28e04 +======================== + +Supported chips: + * Maxim DS28E04-100 4096-Bit Addressable 1-Wire EEPROM with PIO + +supported family codes: + W1_FAMILY_DS28E04 0x1C + +Author: Markus Franke, <franke.m@sebakmt.com> <franm@hrz.tu-chemnitz.de> + +Description +----------- + +Support is provided through the sysfs files "eeprom" and "pio". CRC checking +during memory accesses can optionally be enabled/disabled via the device +attribute "crccheck". The strong pull-up can optionally be enabled/disabled +via the module parameter "w1_strong_pullup". + +Memory Access + + A read operation on the "eeprom" file reads the given amount of bytes + from the EEPROM of the DS28E04. + + A write operation on the "eeprom" file writes the given byte sequence + to the EEPROM of the DS28E04. If CRC checking mode is enabled only + fully alligned blocks of 32 bytes with valid CRC16 values (in bytes 30 + and 31) are allowed to be written. + +PIO Access + + The 2 PIOs of the DS28E04-100 are accessible via the "pio" sysfs file. + + The current status of the PIO's is returned as an 8 bit value. Bit 0/1 + represent the state of PIO_0/PIO_1. Bits 2..7 do not care. The PIO's are + driven low-active, i.e. the driver delivers/expects low-active values. |