linux-toradex.git/drivers/hwmon/ltc4245.c, branch v3.0.91 Linux kernel for Apalis and Colibri modules hwmon: (ltc4245) Expose all GPIO pins as analog voltages 2010-08-14T19:08:49+00:00 Ira W. Snyder iws@ovro.caltech.edu 2010-08-14T19:08:49+00:00 5950ec8d3e47a08ec0b678a0e0ba5d1b9b62dd8e Add support for exposing all GPIO pins as analog voltages. Though this is not an ideal use of the chip, some hardware engineers may decide that the LTC4245 meets their design requirements when studying the datasheet. The GPIO pins are sampled in round-robin fashion, meaning that a slow reader will see stale data. A userspace application can detect this, because it will get -EAGAIN when reading from a sysfs file which contains stale data. Users can choose to use this feature on a per-chip basis by using either platform data or the OF device tree (where applicable). Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Jean Delvare <khali@linux-fr.org> 
Add support for exposing all GPIO pins as analog voltages. Though this is
not an ideal use of the chip, some hardware engineers may decide that the
LTC4245 meets their design requirements when studying the datasheet.

The GPIO pins are sampled in round-robin fashion, meaning that a slow
reader will see stale data. A userspace application can detect this,
because it will get -EAGAIN when reading from a sysfs file which contains
stale data.

Users can choose to use this feature on a per-chip basis by using either
platform data or the OF device tree (where applicable).

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
hwmon: (ltc4245) Read only one GPIO pin 2010-05-27T17:59:02+00:00 Ira W. Snyder iws@ovro.caltech.edu 2010-05-27T17:59:02+00:00 df16dd53c575d0cb9dbee20a3149927c862a9ff6 Read only one of the GPIO pins as an analog voltage. The ADC can be switched to a different GPIO pin at runtime, but this is not supported. Previously, this driver would report the analog voltage of the currently selected GPIO pin as all three GPIO voltages: in9_input, in10_input and in11_input. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: stable@kernel.org 
Read only one of the GPIO pins as an analog voltage. The ADC can be
switched to a different GPIO pin at runtime, but this is not supported.

Previously, this driver would report the analog voltage of the currently
selected GPIO pin as all three GPIO voltages: in9_input, in10_input and
in11_input.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: stable@kernel.org
ltc4215/ltc4245: Discard obsolete detect methods 2009-10-04T20:53:42+00:00 Jean Delvare khali@linux-fr.org 2009-10-04T20:53:42+00:00 2d2a7cff1b63cde1e2d981eea8ae9e69ae9ce96d There is no point in implementing a detect callback for the LTC4215 and LTC4245, as these devices can't be detected. It was there solely to handle "force" module parameters to instantiate devices, but now we have a better sysfs interface that can do the same. So we can get rid of the ugly module parameters and the detect callbacks. This shrinks the binary module sizes by 36% and 46%, respectively. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Ira W. Snyder <iws@ovro.caltech.edu> 
There is no point in implementing a detect callback for the LTC4215
and LTC4245, as these devices can't be detected. It was there solely
to handle "force" module parameters to instantiate devices, but now
we have a better sysfs interface that can do the same.

So we can get rid of the ugly module parameters and the detect
callbacks. This shrinks the binary module sizes by 36% and 46%,
respectively.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Ira W. Snyder <iws@ovro.caltech.edu>
hwmon: (ltc4245) Clear faults at startup 2009-09-23T20:59:44+00:00 Ira W. Snyder iws@ovro.caltech.edu 2009-09-23T20:59:44+00:00 58f055e5314856a3badfa61fe144347903488989 When power is applied to the ltc4245 chip it sometimes reports spurious faults, which are exposed as alarms in the hwmon output. Clear the fault register when the driver is installed to clear the alarms. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Jean Delvare <khali@linux-fr.org> 
When power is applied to the ltc4245 chip it sometimes reports spurious
faults, which are exposed as alarms in the hwmon output. Clear the fault
register when the driver is installed to clear the alarms.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
hwmon: Add LTC4245 driver 2009-01-07T15:37:32+00:00 Ira Snyder iws@ovro.caltech.edu 2009-01-07T15:37:32+00:00 6e34b187bc216fc632769fb8b906d3a29ccd8f14 Add Linux support for the Linear Technology LTC4245 Multiple Supply Hot Swap controller I2C monitoring interface. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jean Delvare <khali@linux-fr.org> 
Add Linux support for the Linear Technology LTC4245 Multiple Supply Hot
Swap controller I2C monitoring interface.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>