summaryrefslogtreecommitdiff
path: root/Documentation/i2c
diff options
context:
space:
mode:
authorWolfram Sang <w.sang@pengutronix.de>2009-09-19 00:45:48 +0400
committerJean Delvare <khali@linux-fr.org>2009-09-19 00:45:48 +0400
commit732d481127abaa0add41ee918191ea08e9ede17e (patch)
tree8d2c939552826eb604882a8dd027bc67832d96e6 /Documentation/i2c
parent8f67eeb0b44cde19216955975ffef8513a87c0c0 (diff)
downloadlinux-732d481127abaa0add41ee918191ea08e9ede17e.tar.xz
i2c/chips: Remove deprecated pca9539 driver
The pca9539 driver in drivers/i2c/chips which just exports its registers to sysfs is superseded by drivers/gpio/pca953x.c which properly uses the gpiolib. As this driver has been deprecated for more than a year, finally remove it. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Ben Gardner <gardner.ben@gmail.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r--Documentation/i2c/chips/pca953958
1 files changed, 0 insertions, 58 deletions
diff --git a/Documentation/i2c/chips/pca9539 b/Documentation/i2c/chips/pca9539
deleted file mode 100644
index 6aff890088b1..000000000000
--- a/Documentation/i2c/chips/pca9539
+++ /dev/null
@@ -1,58 +0,0 @@
-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
-