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authorJean Delvare <khali@linux-fr.org>2008-07-16 13:30:07 -0400
committerJean Delvare <khali@mahadeva.delvare>2008-07-16 13:30:07 -0400
commit3d63430a26b91fe3daee0dd933f899c225e66daa (patch)
tree88b10cf9d53c2c84f13eb60db0e6304ad8eff6da /Documentation/i2c
parent97addff6def3f8e228a634fa017589f45c69de5c (diff)
i2c: Convert the pca9539 driver to a new-style i2c driver
The new-style pca9539 driver implements the optional detect() callback to cover the use cases of the legacy driver. Warning: users will now have to use the force module parameter to get the driver to attach to their device. That's not a bad thing as these devices can't be detected anyway. Note that this doesn't change the fact that this driver is deprecated in favor of gpio/pca953x. Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r--Documentation/i2c/chips/pca953910
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/i2c/chips/pca9539 b/Documentation/i2c/chips/pca9539
index 1d81c530c4a5..6aff890088b1 100644
--- a/Documentation/i2c/chips/pca9539
+++ b/Documentation/i2c/chips/pca9539
@@ -7,7 +7,7 @@ drivers/gpio/pca9539.c instead.
7Supported chips: 7Supported chips:
8 * Philips PCA9539 8 * Philips PCA9539
9 Prefix: 'pca9539' 9 Prefix: 'pca9539'
10 Addresses scanned: 0x74 - 0x77 10 Addresses scanned: none
11 Datasheet: 11 Datasheet:
12 http://www.semiconductors.philips.com/acrobat/datasheets/PCA9539_2.pdf 12 http://www.semiconductors.philips.com/acrobat/datasheets/PCA9539_2.pdf
13 13
@@ -23,6 +23,14 @@ The input sense can also be inverted.
23The 16 lines are split between two bytes. 23The 16 lines are split between two bytes.
24 24
25 25
26Detection
27---------
28
29The PCA9539 is difficult to detect and not commonly found in PC machines,
30so you have to pass the I2C bus and address of the installed PCA9539
31devices explicitly to the driver at load time via the force=... parameter.
32
33
26Sysfs entries 34Sysfs entries
27------------- 35-------------
28 36