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Diffstat (limited to 'Documentation/w1/slaves/w1_ds2413')
| -rw-r--r-- | Documentation/w1/slaves/w1_ds2413 | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/Documentation/w1/slaves/w1_ds2413 b/Documentation/w1/slaves/w1_ds2413 deleted file mode 100644 index 936263a8ccb4..000000000000 --- a/Documentation/w1/slaves/w1_ds2413 +++ /dev/null @@ -1,50 +0,0 @@ -Kernel driver w1_ds2413 -======================= - -Supported chips: - * Maxim DS2413 1-Wire Dual Channel Addressable Switch - -supported family codes: - W1_FAMILY_DS2413 0x3A - -Author: Mariusz Bialonczyk <manio@skyboo.net> - -Description ------------ - -The DS2413 chip has two open-drain outputs (PIO A and PIO B). -Support is provided through the sysfs files "output" and "state". - -Reading state -------------- -The "state" file provides one-byte value which is in the same format as for -the chip PIO_ACCESS_READ command (refer the datasheet for details): - -Bit 0: PIOA Pin State -Bit 1: PIOA Output Latch State -Bit 2: PIOB Pin State -Bit 3: PIOB Output Latch State -Bit 4-7: Complement of Bit 3 to Bit 0 (verified by the kernel module) - -This file is readonly. - -Writing output --------------- -You can set the PIO pins using the "output" file. -It is writable, you can write one-byte value to this sysfs file. -Similarly the byte format is the same as for the PIO_ACCESS_WRITE command: - -Bit 0: PIOA -Bit 1: PIOB -Bit 2-7: No matter (driver will set it to "1"s) - - -The chip has some kind of basic protection against transmission errors. -When reading the state, there is a four complement bits. -The driver is checking this complement, and when it is wrong then it is -returning I/O error. - -When writing output, the master must repeat the PIO Output Data byte in -its inverted form and it is waiting for a confirmation. -If the write is unsuccessful for three times, the write also returns -I/O error. |