Factor out rtc_ops to struct chip_desc and use ds13xx_rtc_ops as default.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Factor out irq_handler to struct chip_desc and use ds1307_irq as default.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Change the usage of variable want_irq to reflect its name. Don't set
it to true in case wakeup is enabled but no interrupt number is given.
In addition set variable ds1307_can_wakeup_device if chip->alarm
is set only.
This allows to simplify the code and make it better understandable.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Constify struct chip_desc variables.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Instead of storing the trickle_charger_setup value in struct chip_desc
we can let function ds1307_trickle_init return it because it's used
in the probe function only.
This allows us to constify struct chip_desc variables in a next step.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Factor out the bbsqi bit to struct chip_desc.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The irq number is used in the probe function only, so we don't have
to store it in struct ds1307.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Commit 8b44f5be ("ARM: dts: armada: replace isil,irq2-can-wakeup-machine with wakeup-source property")
removed the last usage of "isil,irq2-can-wakeup-machine" almost
two years ago. So I think we can get rid of supporting this
legacy binding.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

ds1307_remove() is now empty, remove it
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Instead of adding a binary sysfs attribute from the driver (which suffers
from a race condition as the attribute appears after the device), use the
core to register an nvmem device.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

This removes a possible race condition and crash and allows for further
improvement of the driver.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The ds1308 variant is very similar to the already supported ds1338
variant, it have more debug registers and a square wave clock output.
Signed-off-by: NSean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The driver has lots of places with chip-specific code what doesn't
necessarily facilitate maintenance.

Let's describe chip-specific differences in century bit handling
in struct chip_desc to improve this.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

After the switch to regmap we can now make use of regmap_update_bits
to simplify read/modify/write ops.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Add support for yet another RTC chip, Epson RX8130CE. This time around,
the chip has slightly permutated registers and also the register starts
at 0x10 instead of 0x0 .

So far, we only support the RTC and NVRAM parts of the chip, Alarm and
Timer is not supported.
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

ds1307->rtc->name is a copy of ds1307->name, use it instead.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

This patch extends the fixes for ds1337, ds1339, ds3231 in commit
8bc2a407 ("rtc: ds1307: add support for the DT property
'wakeup-source'") to mcp794xx devices, so that those parts can similarly be
used as a wakeup source without an IRQ to the processor.

Tested on Raspberry Pi ZeroW with MCP79400.
Signed-off-by: NDavid Lowe <dave-lowe@ntlworld.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

This patch converts the ds1307 driver to using regmap. It's a rather
big patch and I can test with DS3231 only. With this chip it's
working fine.

I'd appreciate if people with other supported hardware could test as
well.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

m41t0 was added to the I2C device ID table but not the OF table. Fix that.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The m41t0 variant is very similar to the already supported m41t00
variant, with the notable exception of the oscillator fail bit.
The data sheet notes:

  If the oscillator fail (OF) bit is internally set to a '1,' this
  indicates that the oscillator has either stopped, or was stopped
  for some period of time and can be used to judge the validity of
  the clock and date data.

The bit will get cleared with a regular write of the system time,
so no changes are needed to clear it.
Signed-off-by: NStefan Agner <stefan@agner.ch>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The driver doesn't have a struct of_device_id table but supported devices
are registered via Device Trees. This is working on the assumption that a
I2C device registered via OF will always match a legacy I2C device ID and
that the MODALIAS reported will always be of the form i2c:<device>.

But this could change in the future so the correct approach is to have an
OF device ID table if the devices are registered via OF.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

This patch enables ACPI support for rtc-ds1307 driver.
Signed-off-by: NTin Huynh <tnhuynh@apm.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Intersil ISL12057 is a drop-in replacement for DS1337. It can be supported
by the ds1307 driver.
Acked-by: NArnaud Ebalard <arno@natisbad.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Add an option to properly support the century bit of ds1337 and compatibles
and ds1340.
Because the driver had a bug until now, it is not possible to switch users
to the fixed code directly as RTCs in the field will wrongly have the
century bit set.
Acked-by: NArnaud Ebalard <arno@natisbad.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Since commit d68778b8 ("rtc: initialize output parameter for read
alarm to "uninitialized"") there is no need to explicitly set
unsupported members to -1. So drop the respective assignments from
drivers.
Signed-off-by: NUwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The reset value of weekday is 0x1. This is wrong since
the reset values of the day/month/year make up to Jan 1 2001.
When computed weekday comes out to be Monday. On a scale
of 1-7(Sunday - Saturday) it should be 0x2. So we should not
be relying on the reset value.

Hence compute the wday using the current date/month/year values.
Check if reset wday is any different from the computed wday,
If different then set the wday which we computed using
date/month/year values.

Document Referred:
http://ww1.microchip.com/downloads/en/DeviceDoc/20002266F.pdf

Fixes: 1d1945d2 "drivers/rtc/rtc-ds1307.c: add alarm support for mcp7941x chips"
Signed-off-by: NKeerthy <j-keerthy@ti.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

This flag is a no-op now (see commit 47b0eeb3 "clk: Deprecate
CLK_IS_ROOT", 2016-02-02) so remove it.

Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Michael Tatarinov <kukabu@gmail.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

If a previously-set alarm was disabled and then triggered, it may still
be pending when a new alarm is configured.

Then, if the alarm is enabled before the pending alarm is cleared, then
an interrupt is immediately raised.

Unfortunately, when the alarm is cleared and enabled during the same I²C
block write, the chip (at least the DS1339 I have) considers that the
alarm is enabled before it is cleared, and raises an interrupt.

This patch ensures that the pending alarm is cleared before the alarm is
enabled.
Signed-off-by: NNicolas Boullis <nboullis@debian.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The i2c_smbus_read_i2c_block_data function returns 0 on success, not the
number of bytes written.

Hence, when there are 32 bytes or less to send, the
ds1307_native_smbus_write_block_data function returns 0 on success,
while it returns the number of bytes when there are more than 32.

The ds1307_write_block_data always returns the number of bytes on
success.
Signed-off-by: NNicolas Boullis <nboullis@debian.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

With commit 8bc2a407 ("rtc: ds1307: add support for the
DT property 'wakeup-source'") we lost the ability for rtc irq
functionality for devices that are actually hooked on a real IRQ
line and have capability to wakeup as well. This is not an expected
behavior. So, instead of just not requesting IRQ, skip the IRQ
requirement only if interrupts are not defined for the device.

Fixes: 8bc2a407 ("rtc: ds1307: add support for the DT property 'wakeup-source'")
Reported-by: NTony Lindgren <tony@atomide.com>
Cc: Michael Lange <linuxstuff@milaw.biz>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

while retrieving temperature from ds3231, the result may be overflow
since s16 is too small for a multiplication with 250.

ie. if temp_buf[0] == 0x2d, the result (s16 temp) will be negative.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Tested-by: NMichael Tatarinov <kukabu@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

DS3231 has programmable square-wave output signal.
This enables to use this feature as a clock provider of
common clock framework.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: NMichael Turquette <mturquette@baylibre.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

DS3231 has the temperature registers with a resolution of 0.25
degree celsius.  This enables to get the value through hwmon.

	# cat /sys/class/i2c-adapter/i2c-2/2-0068/hwmon/hwmon0/temp1_input
	21000
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Acked-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

For RTC chips with no IRQ directly connected to the SoC, the RTC chip
can be forced as a wakeup source by stating that explicitly in
the device's .dts file using the "wakeup-source" boolean property.
This will guarantee the 'wakealarm' sysfs entry is available on the
device, if supported by the RTC.

With these changes to the driver rtc-ds1307 and the necessary entries
in the .dts file, I get an working ds1337 RTC on the Witty Pi extension
board by UUGear for the Raspberry Pi.

An example for the entry in the .dts file:

	rtc: ds1337@68 {
		compatible = "dallas,ds1337";
		reg = <0x68>;
		wakeup-source;

If the "wakeup-source" property is set, do not request an IRQ.
Set also UIE mode to unsupported, to get a working 'hwclock' binary.
Signed-off-by: NMichael Lange <linuxstuff@milaw.biz>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

This makes the generated code slightly smaller.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

With the actual code, read_alarm() always returns -EINVAL when called
during the RTC device registration. This prevents from retrieving an
already configured alarm in hardware.

This patch fixes the issue by moving the HAS_ALARM bit configuration
(if supported by the hardware) above the rtc_device_register() call.
Signed-off-by: NSimon Guinot <simon.guinot@sequanux.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Since commit 3fffd128 ("i2c: allow specifying
separate wakeup interrupt in device tree") we have
automatic wakeup irq support for i2c devices. That
commit missed the fact that rtc-1307 had its own
wakeup irq handling and ended up introducing a
kernel splat for at least Beagle x15 boards.

Fix that by reverting original commit _and_ passing
correct interrupt names on DTS so i2c-core can
choose correct IRQ as wakeup.

Now that we have automatic wakeirq support, we can
revert the original commit which did it manually.

Fixes the following warning:

[   10.346582] WARNING: CPU: 1 PID: 263 at linux/drivers/base/power/wakeirq.c:43 dev_pm_attach_wake_irq+0xbc/0xd4()
[   10.359244] rtc-ds1307 2-006f: wake irq already initialized

Cc: Tony Lindgren <tony@atomide.com>
Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

mcp794xx alarm registers must be written in BCD format. However, the
alarm programming logic neglected this by adding one to the value
after bin2bcd conversion has been already done, writing bad values
to month register in case the alarm being set is in October. In this
case, the alarm month value becomes 0x0a instead of the expected 0x10.

Fix by moving the +1 addition within the bin2bcd call also.

Fixes: 1d1945d2 ("drivers/rtc/rtc-ds1307.c: add alarm support for mcp7941x chips")
Signed-off-by: NTero Kristo <t-kristo@ti.com>
Acked-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The change removes redundant sysfs binary file boundary checks, since
this task is already done on caller side in fs/sysfs/file.c
Signed-off-by: NVladimir Zapolskiy <vz@mleia.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

i2c_driver does not need to set an owner because i2c_register_driver()
will set it.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>