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Date:   Thu, 23 Feb 2017 07:38:42 +0100
From:   Mariusz Bialonczyk <>
To:, Evgeniy Polyakov <>,
        Greg Kroah-Hartman <>
Cc:     Mariusz Bialonczyk <>
Subject: [PATCH v2 1/4] w1: add missing DS2413 documentation

Signed-off-by: Mariusz Bialonczyk <>
 Documentation/w1/slaves/00-INDEX  |  2 ++
 Documentation/w1/slaves/w1_ds2413 | 50 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 Documentation/w1/slaves/w1_ds2413

diff --git a/Documentation/w1/slaves/00-INDEX b/Documentation/w1/slaves/00-INDEX
index 6e18c70c3474..cbcca1d3a680 100644
--- a/Documentation/w1/slaves/00-INDEX
+++ b/Documentation/w1/slaves/00-INDEX
@@ -2,6 +2,8 @@
 	- This file
 	- The Maxim/Dallas Semiconductor ds18*20 temperature sensor.
+	- The Maxim/Dallas Semiconductor ds2413 dual channel addressable switch.
 	- The Maxim/Dallas Semiconductor ds2423 counter device.
diff --git a/Documentation/w1/slaves/w1_ds2413 b/Documentation/w1/slaves/w1_ds2413
new file mode 100644
index 000000000000..936263a8ccb4
--- /dev/null
+++ b/Documentation/w1/slaves/w1_ds2413
@@ -0,0 +1,50 @@
+Kernel driver w1_ds2413
+Supported chips:
+  * Maxim DS2413 1-Wire Dual Channel Addressable Switch
+supported family codes:
+        W1_FAMILY_DS2413        0x3A
+Author: Mariusz Bialonczyk <>
+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.

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