linux-toradex.git/drivers/gpio, branch tegra-10.11.0

cs5535-gpio: apply CS5536 errata workaround for GPIOs

2010-12-09T21:33:14+00:00

commit 853ff88324a248a9f5da6e110850223db353ec07 upstream.

The AMD Geode CS5536 Companion Device Silicon Revision B1 Specification
Update mentions the follow as issue #36:

 "Atomic write transactions to the atomic GPIO High Bank Feature Bit
  registers should only affect the bits selected [...]"

 "after Suspend, an atomic write transaction [...] will clear all
  non-selected bits of the accessed register."

In other words, writing to the high bank for a single GPIO bit will
clear every other GPIO bit (but only sometimes after a suspend).

The workaround described is obvious and simple; do a read-modify-write.
This patch does that, and documents why we're doing it.

Signed-off-by: Andres Salomon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

gpio: sx150x: correct and refine reset-on-probe behavior

2010-09-10T01:57:24+00:00

Replace the arbitrary software-reset call from the device-probe
method, because:

- It is defective.  To work correctly, it should be two byte writes,
  not a single word write.  As it stands, it does nothing.

- Some devices with sx150x expanders installed have their NRESET pins
  ganged on the same line, so resetting one causes the others to reset -
  not a nice thing to do arbitrarily!

- The probe, usually taking place at boot, implies a recent hard-reset,
  so a software reset at this point is just a waste of energy anyway.

Therefore, make it optional, defaulting to off, as this will match the
common case of probing at powerup and also matches the current broken
no-op behavior.

Signed-off-by: Gregory Bean 
Reviewed-by: Jean Delvare 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gpiolib: Implement set_debounce for WM831x GPIOs

2010-08-12T09:27:57+00:00

The debounce times are approximate, they can be selected using the two
input functions.

Signed-off-by: Mark Brown 
Signed-off-by: Samuel Ortiz

gpio: Add STMPE GPIO driver

2010-08-12T09:27:55+00:00

Add support for the GPIOs on STMPE I/O Expanders.

[l.fu@pengutronix.de: fix set direction input]
[l.fu@pengutronix.de: set GPIO alternate function while requesting]
Acked-by: Luotao Fu 
Acked-by: Linus Walleij 
Signed-off-by: Rabin Vincent 
Signed-off-by: Samuel Ortiz

gpio: sx150x: add Semtech I2C sx150x gpio expander driver

2010-08-11T15:59:09+00:00

Add support for Semtech SX150-series I2C GPIO expanders.  Compatible
models include:

8 bits:  sx1508q
16 bits: sx1509q

Signed-off-by: Gregory Bean 
Cc: David Brownell 
Cc: Jean Delvare 
Cc: Trilok Soni 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gpiolib: allow nested threaded irqs for poll(2)

2010-08-11T15:59:09+00:00

The pca953x driver requires the use of threaded irqs as its irq
demultiplexer can sleep.  Our irq handler can be called from any context,
so use request_any_context_irq to allow threaded irqs as well.

Signed-off-by: Daniel Gl?ckner 
Reported-by: Ian Jeffray 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gpiolib: get rid of struct poll_desc and worklet

2010-08-11T15:59:08+00:00

As sysfs_notify_dirent has been made irq safe, there is no reason to not
call it directly from irq.  With the work_struct removed, the remaining
element in poll_desc is a sysfs_dirent pointer which may not be NULL.  We
can therefore store it directly in the idr and pass it as context to the
irq handler.

Most part of the patch deals with renaming defines and variables to
reflect their new use without functional change.

I also took the opportunity to initialize the idr statically.

Signed-off-by: Daniel Gl?ckner 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gpiolib: decouple might_sleep_if() from DEBUG

2010-08-11T15:59:08+00:00

Be more consistent about runtime programming interface abuse warnings,
which can reduce some confusion and trigger bugfixes.  Based on an
observation and patch from Jani Nikula.

Also update doc to highlight some sleeping-call issues and to match some
recent changes.

Signed-off-by: David Brownell 
Cc: Jani Nikula 
Cc: "Ryan Mallon" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pcf857x: support working w/o platform data

2010-08-11T15:59:08+00:00

Provide sane defaults for pcf857x, so the driver can be used w/o providing
platform data (and thus can be simply bound via OF tree).

Signed-off-by: Dmitry Eremin-Solenikov 
Cc: Jean Delvare 
Cc: David Brownell 
Cc: Grant Likely 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gpio: max730x: make pullups configurable via platformdata

2010-08-11T15:59:08+00:00

The gpios on the max730x chips have support for internal pullups while in
input mode.

This patch adds support for configuring these pullups via platform data.
A new member ("input_pullup_active") to the platform data struct is
introduced.  A set bit in this variable activates the pullups while the
respective port is in input mode.  This is a compatible enhancement since
unset bits lead to disables pullups which was the default in the original
driver.

_Note_: the 4 lowest bits in "input_pullup_active" are unused because the
first 4 ports of the controller are not used, too.

Signed-off-by: Marc Kleine-Budde 
Reviewed-by: Wolfram Sang 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds