linux-toradex.git/include/linux/rtc.h, branch v2.6.38.5

RTC: Re-enable UIE timer/polling emulation

2011-02-17T22:59:42+00:00

This patch re-enables UIE timer/polling emulation for rtc devices
that do not support alarm irqs.

CC: Uwe Kleine-König 
CC: Thomas Gleixner 
Reported-by: Uwe Kleine-König 
Tested-by: Uwe Kleine-König 
Signed-off-by: John Stultz

RTC: Revert UIE emulation removal

2011-02-17T22:59:41+00:00

Uwe pointed out that my alarm based UIE emulation is not sufficient
to replace the older timer/polling based UIE emulation on devices
where there is no alarm irq. This causes rtc devices without alarms
to return -EINVAL to UIE ioctls. The fix is to re-instate the old
timer/polling method for devices without alarm irqs.

This patch reverts the following commits:
042620a018afcfba1d678062b62e46 - Remove UIE emulation
1daeddd5962acad1bea55e524fc0fa - Cleanup removed UIE emulation declaration
b5cc8ca1c9c3a37eaddf709b2fd3e1 - Remove Kconfig symbol for UIE emulation

The emulation mode will still need to be wired-in with a following
patch before it will work.

CC: Uwe Kleine-König 
CC: Thomas Gleixner 
Reported-by: Uwe Kleine-König 
Signed-off-by: John Stultz

RTC: Propagate error handling via rtc_timer_enqueue properly

2011-01-21T16:38:19+00:00

In cases where RTC hardware does not support alarms, the virtualized
RTC interfaces did not have a way to propagate the error up to userland.

This patch extends rtc_timer_enqueue so it catches errors from the hardware
and returns them upwards to the virtualized interfaces. To simplify error
handling, it also internalizes the management of the timer->enabled bit
into rtc_timer_enqueue and rtc_timer_remove.

Also makes rtc_timer_enqueue and rtc_timer_remove static.

Reported-by: David Daney 
Reported-by: Andreas Schwab 
Reported-by: Geert Uytterhoeven 
Diagnosed-by: David Daney 
Tested-by: David Daney 
Signed-off-by: John Stultz 
LKML-Reference: <1295565973-14358-1-git-send-email-john.stultz@linaro.org>
Signed-off-by: Thomas Gleixner

rtc: Cleanup removed UIE emulation declaration

2011-01-21T16:38:18+00:00

rtc_dev_update_irq_enable_emul was removed in commit
042620a018afcfba1d678062b62e463b9e43a68d (UIE emulation is
now handled via hrtimer), but the declaration was missed.
This patch cleans it up.

Signed-off-by: John Stultz 
LKML-Reference: <1294939849-20608-1-git-send-email-john.stultz@linaro.org>
Signed-off-by: Thomas Gleixner

rtc: Namespace fixup

2010-12-13T21:48:21+00:00

rtctimer_* is already occupied by sound/core/rtctimer.c. Instead of
fiddling with that, rename the new functions to rtc_timer_* which
reads nicer anyway.

Signed-off-by: Thomas Gleixner 
Cc: John Stultz

RTC: Remove UIE emulation

2010-12-11T06:24:25+00:00

Since we provide UIE interrupts via a rtc_timer, the old
emulation code can be removed.

Signed-off-by: John Stultz 
LKML Reference: <1290136329-18291-5-git-send-email-john.stultz@linaro.org>
Acked-by: Alessandro Zummo 
Reviewed-by: Thomas Gleixner 
CC: Alessandro Zummo 
CC: Thomas Gleixner 
CC: Richard Cochran

RTC: Rework RTC code to use timerqueue for events

2010-12-11T06:24:24+00:00

This patch reworks a large portion of the generic RTC code
to in-effect virtualize the rtc interrupt code.

The current RTC interface is very much a raw hardware interface.
Via the proc, /dev/, or sysfs interfaces, applciations can set
the hardware to trigger interrupts in one of three modes:

AIE: Alarm interrupt
UIE: Update interrupt (ie: once per second)
PIE: Periodic interrupt (sub-second irqs)

The problem with this interface is that it limits the RTC hardware
so it can only be used by one application at a time.

The purpose of this patch is to extend the RTC code so that we can
multiplex multiple applications event needs onto a single RTC device.
This is done by utilizing the timerqueue infrastructure to manage
a list of events, which cause the RTC hardware to be programmed
to fire an interrupt for the next event in the list.

In order to preserve the functionality of the exsting proc,/dev/ and
sysfs interfaces, we emulate the different interrupt modes as follows:

AIE: We create a rtc_timer dedicated to AIE mode interrupts. There is
only one per device, so we don't change existing interface semantics.

UIE: Again, a dedicated rtc_timer, set for periodic mode, is used
to emulate UIE interrupts. Again, only one per device.

PIE: Since PIE mode interrupts fire faster then the RTC's clock read
granularity, we emulate PIE mode interrupts using a hrtimer. Again,
one per device.

With this patch, the rtctest.c application in Documentation/rtc.txt
passes fine on x86 hardware. However, there may very well still be
bugs, so greatly I'd appreciate any feedback or testing!

Signed-off-by: John Stultz 
LKML Reference: <1290136329-18291-4-git-send-email-john.stultz@linaro.org>
Acked-by: Alessandro Zummo 
Reviewed-by: Thomas Gleixner 
CC: Alessandro Zummo 
CC: Thomas Gleixner 
CC: Richard Cochran

rtc/hctosys: only claim the RTC provided the system time if it did

2010-03-12T23:52:28+00:00

Without this patch /sys/class/rtc/$CONFIG_RTC_HCTOSYS_DEVICE/hctosys
contains a 1 (meaning "This rtc was used to initialize the system clock")
even if reading the time at bootup failed.

Moreover change error handling in rtc_hctosys() to use goto and so reduce
the indention level.

Signed-off-by: Uwe Kleine-König 
Cc: Paul Gortmaker 
Acked-by: Alessandro Zummo 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

rtc: convert LEAP_YEAR into an inline

2009-04-01T15:59:24+00:00

- the LEAP_YEAR macro is buggy - it references its arg multiple times.
  Fix this by turning it into a C function.

- give it a more approriate name

- Move it to rtc.h so that other .c files can use it, instead of copying it.

Cc: dann frazier 
Acked-by: Alessandro Zummo 
Cc: stephane eranian 
Cc: "Luck, Tony" 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

rtc: add alarm/update irq interfaces

2009-01-04T21:33:20+00:00

Add standard interfaces for alarm/update irqs enabling.  Drivers are no
more required to implement equivalent ioctl code as rtc-dev will provide
it.

UIE emulation should now be handled correctly and will work even for those
RTC drivers who cannot be configured to do both UIE and AIE.

Signed-off-by: Alessandro Zummo 
Cc: David Brownell 
Cc: Atsushi Nemoto 
Cc: Ralf Baechle 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds