Commit Graph

2967 Commits

Author SHA1 Message Date
Baolin Wang 3822d1bb0d rtc: sc27xx: Always read normal alarm when registering RTC device
When registering one RTC device, it will check to see if there is an
alarm already set in RTC hardware by reading RTC alarm, at this time
we should always read the normal alarm put in always-on region by
checking the rtc->registered flag.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-25 02:35:42 +02:00
Baolin Wang bf2c532b67 rtc: sc27xx: Add check to see if need to enable the alarm interrupt
The RTC interrupt enable register is not put in always-power-on region
supplied by VDDRTC, so we should check if we need enable the alarm
interrupt when system booting.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-25 02:35:40 +02:00
Baolin Wang b2ddc48582 rtc: sc27xx: Remove interrupts disable and clear in probe()
When registering one rtc device, it will check to see if there is an
alarm already set in rtc hardware by issuing __rtc_read_alarm(). So
we should not disable the RTC interrupts and clear the interrupts
status in probe() function.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-25 02:35:39 +02:00
Baolin Wang 7db5adfa63 rtc: sc27xx: Clear SPG value update interrupt status
We should clear the SPG value update interrupt status once the SPG value
is updated successfully, in case incorrect status validation for next time.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-25 02:35:38 +02:00
Baolin Wang a86d6b23ed rtc: sc27xx: Set wakeup capability before registering rtc device
Set wakeup capability before registering rtc device, in case the alarmtimer
can find one available rtc device.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-25 02:35:36 +02:00
Nathan Chancellor ef0f02fd69 rtc: s35390a: Change buf's type to u8 in s35390a_init
Clang warns:

drivers/rtc/rtc-s35390a.c:124:27: warning: implicit conversion from
'int' to 'char' changes value from 192 to -64 [-Wconstant-conversion]
        buf = S35390A_FLAG_RESET | S35390A_FLAG_24H;
            ~ ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
1 warning generated.

Update buf to be an unsigned 8-bit integer, which matches the buf member
in struct i2c_msg.

https://github.com/ClangBuiltLinux/linux/issues/145
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-22 19:29:43 +02:00
Soeren Moch 7dceef78f3 rtc: ds1307: fix ds1339 wakealarm support
Commit 51ed73eb99 ("rtc: ds1340: Add support
for trickle charger.") breaks ds1339 wakealarm support by limiting
accessible registers. Fix this.

Fixes: 51ed73eb99 ("rtc: ds1340: Add support for trickle charger.")
Cc: stable@vger.kernel.org
Signed-off-by: Soeren Moch <smoch@web.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-22 17:53:14 +02:00
Wolfram Sang 6f5b390b3a rtc: ds1685: simplify getting .driver_data
We should get 'driver_data' from 'struct device' directly. Going via
platform_device is an unneeded step back and forth.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-22 17:53:12 +02:00
Gustavo A. R. Silva c3e04915b8 rtc: m41t80: mark expected switch fall-through
In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Notice that in this particular case, I replaced "Fall" with a proper
"Fall through" comment.

Addresses-Coverity-ID: 1373875 ("Missing break in switch")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-16 12:56:58 +02:00
Thierry Reding fe0b5cedc2 rtc: tegra: Propagate errors from platform_get_irq()
Instead of confusingly returning -EBUSY on failure to obtain an
interrupt, propagate the real error code. While at it, let the user know
why the interrupt could not be acquired.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-16 12:56:56 +02:00
Maciej W. Rozycki bc51098cdd rtc: cmos: Remove the `use_acpi_alarm' module parameter for !ACPI
Fix a problem with commit 311ee9c151 ("rtc: cmos: allow using ACPI for
RTC alarm instead of HPET") defining `use_acpi_alarm' module parameter
even for non-ACPI platforms, which ignore it.  Wrap the definition into
#ifdef CONFIG_ACPI and use a static inline wrapper function, hardcoded
to return 0 and consequently optimized away for !ACPI, following the
existing pattern with HPET handling functions.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Fixes: 311ee9c151 ("rtc: cmos: allow using ACPI for RTC alarm instead of HPET")
Cc: stable@vger.kernel.org # 4.18+
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-04 11:15:57 +02:00
Maciej W. Rozycki d197a25385 rtc: cmos: Fix non-ACPI undefined reference to `hpet_rtc_interrupt'
Fix a commit 311ee9c151 ("rtc: cmos: allow using ACPI for RTC alarm
instead of HPET") `rtc-cmos' regression causing a link error:

drivers/rtc/rtc-cmos.o: In function `cmos_platform_probe':
rtc-cmos.c:(.init.text+0x33c): undefined reference to `hpet_rtc_interrupt'
rtc-cmos.c:(.init.text+0x3f4): undefined reference to `hpet_rtc_interrupt'

with non-ACPI platforms using this driver.  The cause is the change of
the condition guarding the use of `hpet_rtc_interrupt'.

Previously it was a call to `is_hpet_enabled'.  That function is static
inline and has a hardcoded 0 result for non-ACPI platforms, which imply
!HPET_EMULATE_RTC.  Consequently the compiler optimized the whole block
away including the reference to `hpet_rtc_interrupt', which never made
it to the link stage.

Now the guarding condition is a call to `use_hpet_alarm', which is not
static inline and therefore the compiler may not be able to prove that
it actually always returns 0 for non-ACPI platforms.  Consequently the
build breaks with an unsatisfied reference, because `hpet_rtc_interrupt'
is nowhere defined at link time.

Fix the problem by marking `use_hpet_alarm' inline.  As the `inline'
keyword serves as an optimization hint rather than a requirement the
compiler is still free to choose whether inlining will be beneficial or
not for ACPI platforms.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Fixes: 311ee9c151 ("rtc: cmos: allow using ACPI for RTC alarm instead of HPET")
Cc: stable@vger.kernel.org # 4.18+
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-04 11:15:55 +02:00
Alexandre Belloni 959e8b77bf rtc: mv: let the core handle invalid alarms
Instead of lying to the core when the alarm is invalid, let it handle that
by returning the error.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Tested-by: Gregory CLEMENT <gregory.clement@bootlin.com>  (on Armada 375 DB)
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-03 11:07:24 +02:00
Alexandre Belloni 89e27ce498 rtc: vr41xx: switch to rtc_time64_to_tm/rtc_tm_to_time64
Call the 64bit versions of rtc_time_to_tm now that the range is enforced by
the core.
Also remove the open coded rtc_tm_to_time64.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-10-03 11:07:22 +02:00
Alexandre Belloni 9a90a5bcc7 rtc: ab8500: remove useless check
rtc_time_to_tm always rturns a valid tm, there is no need to validate it.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:36:49 +02:00
Alexandre Belloni 38ab97aebe rtc: ab8500: let the core handle range
Let the core handle offsetting and windowing the RTC range.
The RTC has a 24 bit counter for minutes plus a seconds counter.
Keep the epoch at the beginning of 2000.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:36:47 +02:00
Alexandre Belloni b56295dd33 rtc: ab8500: use rtc_add_group
Use rtc_add_group to add the sysfs group in a race free manner.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:36:44 +02:00
Alexandre Belloni 1654a2b06b rtc: rs5c348: report error when time is invalid
Instead of resetting the RTC to an bogus valid time, let userspace know
that the time is invalid when XSTP is set. Reset XSTP when setting the time
again.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:03 +02:00
Alexandre Belloni 2d7be4ed7a rtc: rs5c348: remove forward declaration
The name passed to devm_rtc_device_register is now unused. anyway, switch
to devm_rtc_allocate_device to avoid forward declaring rs5c348_driver.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:03 +02:00
Alexandre Belloni 02a6e12932 rtc: rs5c348: remove useless label
Since commit 8fb1ecb36f ("rtc: rtc-rs5c348: use devm_*() functions") the
kfree_exit label simply returns ret.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:03 +02:00
Alexandre Belloni f6e3d773e1 rtc: armada38x: switch to rtc_time64_to_tm/rtc_tm_to_time64
Call the 64bit versions of rtc_time_to_tm and rtc_tm_to_time now that the
range is enforced by the core.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:03 +02:00
Alexandre Belloni ef2a7176c8 rtc: armada38x: add range
The RTC is a 32bit seconds counter.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Tested-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:02 +02:00
Alexandre Belloni 7d61cbb945 rtc: armada38x: fix possible race condition
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.

Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:02 +02:00
Alexandre Belloni 0ae3f24ded rtc: lib: correct documentation typo
rtc_time64_to_tm has not been called rtc_time_to_tm64

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:02 +02:00
Alexandre Belloni 6a5f2a1f4d rtc: ds1307: use rtc_add_group
Register frequency test using rtc_add_group to avoid a possible race
condition and simplify the code.

This also moves the attribute to its proper location under the rtc device
instead of the i2c parent device.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:01 +02:00
Alexandre Belloni cfb74916e2 rtc: ds1685: use rtc_add_group
Use rtc_add_group to add the sysfs group in a race free manner.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:01 +02:00
Alexandre Belloni 482419e120 rtc: ds1685: use generic nvmem
Instead of adding a binary sysfs attribute from the driver, use the core to
register an nvmem device.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:01 +02:00
Alexandre Belloni 8ddeb09de1 rtc: ds1685: drop RTC_DS1685_PROC_REGS
/proc is not the correct ABI to display debugging info. Remove
RTC_DS1685_PROC_REGS as the driver hasn't seen any real development since
it was included.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:00 +02:00
Alexandre Belloni c7080e2016 rtc: test: Switch to SPDX identifier
Replace the license boilerplate by an SPDX identifier

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:00 +02:00
Alexandre Belloni fd13c930fe rtc: test: make license text and module license match.
The license text is specifying GPL v2 only but the MODULE_LICENSE is set to
GPL which means GNU Public License v2 or later. When MODULE_LICENSE and
boiler plate does not match, go for boiler plate license.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:21:00 +02:00
Alexandre Belloni 2ab78755e9 rtc: tx4939: fixup nvmem name and register size
The default word_size and stride of 1 are correct for the tx4939. Also fix
the nvmem folder name.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:20:59 +02:00
Alexandre Belloni 4b3a6a3ac5 rtc: isl1208: don't include core header file
The core header file is reserved for the core, stop including it.

Also reorder includes alphabetically.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:20:59 +02:00
Alexandre Belloni eb2bccb70b rtc: move rtc_add_group/s definitions
Move rtc_add_group and rtc_add_groups definition to rtc.h that is available
for all RTC drivers.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:20:59 +02:00
Alexandre Belloni db7a67b9c3 rtc: reorder Makefile entries
A few entries are not placed correctly, reorder them.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:20:58 +02:00
Giulio Benetti b41c23e152 rtc: ds1307: add frequency_test_enable attribute on m41txx
On m41txx you can enable open-drain OUT pin to check if offset is ok.
Enabling OUT pin with frequency_test_enable attribute, OUT pin will tick
512 times faster than 1s tick base.

Enable or Disable FT bit on CONTROL register if freq_test is 1 or 0.

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:20:58 +02:00
Giulio Benetti 79230ff641 rtc: ds1307: add offset sysfs for mt41txx chips.
m41txx chips can hold a calibration value to get correct clock bias.

Add offset handling (ranging between -63ppm and 126ppm) via sysfs.

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-28 14:20:58 +02:00
Alexandre Belloni 1b4c794fda rtc: isl1208: avoid possible sysfs race
Use rtc_add_group to add the common sysfs group to avoid a possible race
condition.

[Denis.Osterland@diehl.com: use to_i2c_client(dev->parent)]
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The move of atrim, dtrim usr sysfs properties from i2c device
to rtc device require to access them via dev->parent.
This patch also aligns timestamp0.
2018-09-28 14:14:38 +02:00
Alexandre Belloni f1c8bc332e rtc: remove irq_task from kerneldoc
Stale mentions of irq_task are left in the kerneldoc after its removal.
Remove them.

There is still one indirect mention left but commit 3c8bb90efb ("rtc: Fix
hrtimer deadlock") can probably be reverted now.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-13 15:43:07 +02:00
Alexandre Belloni 1e479c619b rtc: unexport non devm managed registration
Ensure the non managed version of the un/registration functions is not used
anymore. No driver is using it anymore and they should not be necessary.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-13 15:43:05 +02:00
Jeremy Gebben 749e36d0a0 rtc: abx80x: add basic watchdog support
The abx804 and abx805 chips have support for a simple watchdog
function that can trigger an external reset.

Signed-off-by: Jeremy Gebben <jgebben@sweptlaser.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-12 12:02:21 +02:00
Jeremy Gebben af69f9a787 rtc: abx80x: use a 'priv' struct for client data
This will allow additional data to be tracked, for future
improvements.

Signed-off-by: Jeremy Gebben <jgebben@sweptlaser.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-12 12:02:19 +02:00
Alexandre Belloni b7aff107f3 rtc: pl031: switch to devm_rtc_allocate_device/rtc_register_device
Switch to devm_rtc_allocate_device to simplify the erro and driver removal
paths.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-11 13:56:35 +02:00
Alexandre Belloni c778ec8582 rtc: pl030: fix possible race condition
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.

Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-11 13:56:35 +02:00
Alexandre Belloni babab2f864 rtc: mt6397: fix possible race condition
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.

Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.

Acked-by: Eddie Huang <eddie.huang@mediatek.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-09-11 13:56:20 +02:00
YueHaibing de96bc3995 rtc: mrst: remove set but not used variable 'valid'
Fixes gcc '-Wunused-but-set-variable' warning:

drivers/rtc/rtc-mrst.c: In function 'mrst_procfs':
drivers/rtc/rtc-mrst.c:264:29: warning:
 variable 'valid' set but not used [-Wunused-but-set-variable]
  unsigned char rtc_control, valid;

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-08-31 11:17:41 +02:00
Alexandre Belloni ac771ed746 rtc: rv8803: add Epson RX8803 support
The Epson rx8803 is mostly similar to the Microcrystal RV8803 but the size
of the offset register is 4 bits vs 6 bits but it has a configurable
temperature compensation.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-08-27 23:24:36 +02:00
Alexandre Belloni c856618d20 rtc: rv8803: fix the rv8803 id in the OF table
The ID for RV8803 must be rv_8803

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-08-27 23:24:35 +02:00
Dan Carpenter 777d8ae56d rtc: sysfs: fix NULL check in rtc_add_groups()
devm_kcalloc() returns NULL, it never returns error pointers.  In the
current code we would return PTR_ERR(NULL) which is success, instead of
returning the -ENOMEM error code.

Fixes: a0a1a1ba30 ("rtc: sysfs: facilitate attribute add to rtc device")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-08-27 23:03:34 +02:00
Gustavo A. R. Silva 725e0e15f8 rtc: sun6i: Use struct_size() in kzalloc()
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
	int stuff;
        void *entry[];
};

instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-08-27 23:02:18 +02:00
Paul Cercueil 1e6e4e169a rtc: jz4740: Drop dependency on MACH_INGENIC
Depending on MACH_INGENIC prevent us from creating a generic kernel that
works on more than one MIPS board. Instead, we just depend on MIPS being
set.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-08-27 22:59:37 +02:00