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| author | Jean Delvare <khali@linux-fr.org> | 2008-07-16 19:30:07 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@mahadeva.delvare> | 2008-07-16 19:30:07 +0200 |
| commit | 3d63430a26b91fe3daee0dd933f899c225e66daa (patch) | |
| tree | 88b10cf9d53c2c84f13eb60db0e6304ad8eff6da /Documentation/i2c | |
| parent | 97addff6def3f8e228a634fa017589f45c69de5c (diff) | |
| download | lwn-3d63430a26b91fe3daee0dd933f899c225e66daa.tar.gz lwn-3d63430a26b91fe3daee0dd933f899c225e66daa.zip | |
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/pca9539 | 10 |
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. Supported chips: * Philips PCA9539 Prefix: 'pca9539' - Addresses scanned: 0x74 - 0x77 + Addresses scanned: none Datasheet: http://www.semiconductors.philips.com/acrobat/datasheets/PCA9539_2.pdf @@ -23,6 +23,14 @@ 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 ------------- |