linux-toradex.git/drivers/rtc, branch v2.6.31.10

rtc: v3020: fix v3020_mmio_read_bit()

2009-12-08T18:21:19+00:00

commit bcb3a1676b87effbdeffe8da5c44f63433d158d9 upstream.

v3020_mmio_read_bit() always returns 0 when left_shift > 7.

v3020_mmio_read_bit()'s return type is (unsigned char).  The code returns
a value masked by (1 << left_shift) that is casted to the return type.  If
left_shift is larger than 7, the cast will always result in a 0 return
value.  The problem was discovered with left_shift = 16, and the included
patch corrects the problem.

The bug was introduced in the last (Apr 3 2009) commit of the file, kernel
versions 2.6.30 and later.

Cc: Alessandro Zummo 
Cc: Paul Gortmaker 
Cc: Raphael Assenat 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

rtc: mark if rtc-cmos drivers were successfully registered

2009-07-30T02:10:35+00:00

rtc-cmos has two drivers, one PNP and one platform.  When PNP has not
succeeded probing, platform is registered.  However, it tries to
unregister both drivers unconditionally, instead of only unregistering
those that were successfully registered.  This causes runtime warnings to
be emitted from the driver core code.

Fix this with a boolean variable for each driver indicating whether
registering was successful.

Signed-off-by: Thadeu Lima de Souza Cascardo 
Cc: David Brownell 
Cc: Bjorn Helgaas 
Cc: Alessandro Zummo 
Cc: Ingo Molnar 
Cc: David Brownell 
Cc: Kay Sievers 
Cc: Greg KH 
Cc: Ozan Caglayan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

rtc: ds1374, fix lock imbalance

2009-07-06T20:57:03+00:00

When i2c_smbus_read_byte_data fails in ds1374_work, we forgot to unlock
the held lock.  Fix that.

Signed-off-by: Jiri Slaby 
Cc: Alessandro Zummo 
Cc: Scott Wood 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Update Yoichi Yuasa's e-mail address

2009-07-03T14:45:29+00:00

Signed-off-by: Yoichi Yuasa 
Signed-off-by: Ralf Baechle

bfin: delay IRQ registration until driver is ready

2009-07-01T01:56:01+00:00

Make sure we do not actually request the RTC IRQ until the device driver
is fully ready to handle and process any interrupt.  This way a spurious
interrupt won't crash the system (which may happen if the bootloader was
poking the RTC right before booting Linux).

Signed-off-by: Mike Frysinger 
Signed-off-by: Alessandro Zummo 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

rtc: make rtc_update_irq callable with irqs enabled

2009-06-19T23:46:05+00:00

The rtc_update_irq() might be called with irqs enabled, if a interrupt
handler was registered without IRQF_DISABLED.  Use
spin_lock_irqsave/spin_unlock_irqrestore instead of spin_lock/spin_unlock.

Also update kerneldoc and drivers which do extra work to follow the
current interface spec, as suggestted by David Brownell.

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

rtc-ds1553: drop IRQF_SHARED

2009-06-18T20:03:43+00:00

IRQF_SHARED should not be used with IRQF_DISABLED.  There is no in-tree
user of this driver and only out-of-tree user I know uses a dedicated irq
line for this RTC.

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

rtc-tx4939: drop IRQF_SHARED

2009-06-18T20:03:43+00:00

IRQF_SHARED should not be used with IRQF_DISABLED.  This RTC have a
dedicated irq line to SoC's internal interrupt controller so there is
no reason to use IRQF_SHARED.

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

rtc: add stand-alone driver for RX8025 chip

2009-06-18T20:03:43+00:00

Add support for the Epson RX-8025SA/NB RTC chips.  It includes support for
alarms, periodic interrupts (1 Hz) and clock precision adjustment.

For clock precision adjustment, the SYSFS file "clock_adjust_ppb" gets
created in "/sys/class/rtc/rtcX/device".  It permits to set and get the
clock adjustment in ppb (parts per billion), e.g.:

  # echo -183000 > /sys/class/rtc/rtc0/device/clock_adjust_ppb
  # cat /sys/class/rtc/rtc0/device/clock_adjust_ppb
  -183000

This allows to compensate temperature dependent clock drifts.  According
to the RX8025 SA/NB application manual the frequency and temperature
characteristics can be approximated using the following equation:

  df = a * (ut - t)**2

  df: Frequency deviation in any temperature
  a : Coefficient = (-35 +-5) * 10**-9
  ut: Ultimate temperature in degree = +25 +-5 degree
  t : Any temperature in degree

Signed-off-by: Wolfgang Grandegger 
Signed-off-by: Sergei Poselenov 
Signed-off-by: Yuri Tikhonov 
Signed-off-by: Dmitry Rakhchev 
Signed-off-by: Matthias Fuchs 
Acked-by: Jean Delvare 
Signed-off-by: Alessandro Zummo 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

rtc: rtc-ds1307 add ds3231

2009-06-18T20:03:43+00:00

Add ds3231 variant.  For that, the BBSQI bit position was changed from a
simple define into a lookup-array as it differs.  This also removes
writing to an unused bit in case of the ds1337.

Signed-off-by: Wolfram Sang 
Acked-by: David Brownell 
Signed-off-by: Alessandro Zummo 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds