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path: root/drivers/rtc/rtc-ds1307.c
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2017-10-26rtc: ds1307: add OF and ACPI entries for Epson RX8130Bastian Stender1-0/+5
Make Epson RX8130 device tree and ACPI aware. Fixes: ee0981be7704 ("rtc: ds1307: Add support for Epson RX8130CE") Signed-off-by: Bastian Stender <bst@pengutronix.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-10-12rtc: ds1307: improve weekday handlingHeiner Kallweit1-26/+26
The current code for checking and fixing the weekday in ds1307_probe faces some issues: - This check is applied to all chips even if its applicable (AFAIK) to mcp794xx only - The check uses MCP794XX constants for registers and bits even though it's executed also on other chips (ok, this could be fixed easily) - It relies on tm_wday being properly populated when core calls set_time and set_alarm. This is not guaranteed at all. First two issue we could solve by moving the check to the mcp794xx-specific initialization (where also VBATEN flag is set). The proposed alternative is in the set_alarm path for mcp794xx only and calculates the alarm weekday based on the current weekday in the RTC timekeeping regs and the difference between alarm date and current date. So we are fine with any weekday even if it doesn't match the date. Still there are cases where this could fail, e.g.: - rtc date/time + weekday have power-on-reset default values - alarm is set to actual date/time + x - set_time is called (may change diff between rtc weekday and actual weekday) But similar issues we have with the current code too: - rtc date/time + weekday have power-on-reset default values - alarm is set to rtc date/time + x - set_time is called before the alarm triggers Using random rtc date/time with relative alarms simply can interfere with set_time. I'm not totally convinced of either option yet. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-13Merge tag 'rtc-4.14' of ↵Linus Torvalds1-225/+232
git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux Pull RTC updates from Alexandre Belloni: "Subsystem: - remove .open() and .release() RTC ops - constify i2c_device_id New driver: - Realtek RTD1295 - Android emulator (goldfish) RTC Drivers: - ds1307: Beginning of a huge cleanup - s35390a: handle invalid RTC time - sun6i: external oscillator gate support" * tag 'rtc-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (40 commits) rtc: ds1307: use octal permissions rtc: ds1307: fix braces rtc: ds1307: fix alignments and blank lines rtc: ds1307: use BIT rtc: ds1307: use u32 rtc: ds1307: use sizeof rtc: ds1307: remove regs member rtc: Add Realtek RTD1295 dt-bindings: rtc: Add Realtek RTD1295 rtc: sun6i: Add support for the external oscillator gate rtc: goldfish: Add RTC driver for Android emulator dt-bindings: Add device tree binding for Goldfish RTC driver rtc: ds1307: add basic support for ds1341 chip rtc: ds1307: remove member nvram_offset from struct ds1307 rtc: ds1307: factor out offset to struct chip_desc rtc: ds1307: factor out rtc_ops to struct chip_desc rtc: ds1307: factor out irq_handler to struct chip_desc rtc: ds1307: improve irq setup rtc: ds1307: constify struct chip_desc variables rtc: ds1307: improve trickle charger initialization ...
2017-09-05rtc: ds1307: use octal permissionsAlexandre Belloni1-1/+1
Octal permissions are preferred over symbolic permissions. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-05rtc: ds1307: fix bracesAlexandre Belloni1-3/+3
Fix unnecessary or unbalanced braces. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-05rtc: ds1307: fix alignments and blank linesAlexandre Belloni1-11/+10
Alignment should always match open parenthesis. Also remove two unnecessary blank lines Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-05rtc: ds1307: use BITAlexandre Belloni1-9/+9
Use the BIT macro were possbiel. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-05rtc: ds1307: use u32Alexandre Belloni1-4/+4
u32 should be used instead of uint32_t Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-05rtc: ds1307: use sizeofAlexandre Belloni1-8/+16
Use sizeof where possible to ensure we don't read/write more than the allocated buffer. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-05rtc: ds1307: remove regs memberAlexandre Belloni1-100/+107
ds1307->regs is never used before being read or initialized locally. There is no point in keeping a copy in memory. Also limit the size of the read buffer to what is really used, rename buf to regs for consistency and use sizeof() where possible. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: add basic support for ds1341 chipNikita Yushchenko1-0/+12
This adds support for reading and writing date/time from/to ds1341 chip. ds1341 chip has other features - alarms, input clock (can be used instead of intercal oscillator for better accuracy), output clock ("square wave generation"). However, not all of that is available at the same time. Same chip pins, CLKIN/nINTA and SQW/nINTB, can be used either for input/output clocks, or for alarm interrupts. Role of these pins on particular board depends on hardware wiring. We can add device tree properties that describe if each of pins is wired as clock, or as interrupt, or left unconnected, and enable support for corresponding functionality based on that. But that is cumbersome, requires hardware for testing, and has to deal with bit enabling/disabling output clock also affects which pins alarm interrupts are routed to. Another factor is that there are hardware setups (i.e. ZII RDU2) that power DS1341 from SuperCap, which makes power saving critical. For such setups, kernel driver should leave register bits that control mentioned pins in the state configured by bootloader. Given all that, it was decided to limit support to "only date/time" for now. That is enough for common use case. Full (and cumbersome) implementation can be added later if ever needed. Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Aleksander Morgado <aleksander@aleksander.es> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: remove member nvram_offset from struct ds1307Heiner Kallweit1-4/+4
Remove member nvram_offset from struct ds1307 and use the value stored in struct chip_desc directly. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: factor out offset to struct chip_descHeiner Kallweit1-11/+7
Factor out offset to struct chip_desc and remove it from struct ds1307. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: factor out rtc_ops to struct chip_descHeiner Kallweit1-23/+28
Factor out rtc_ops to struct chip_desc and use ds13xx_rtc_ops as default. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: factor out irq_handler to struct chip_descHeiner Kallweit1-8/+7
Factor out irq_handler to struct chip_desc and use ds1307_irq as default. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: improve irq setupHeiner Kallweit1-17/+10
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: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: constify struct chip_desc variablesHeiner Kallweit1-3/+3
Constify struct chip_desc variables. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: improve trickle charger initializationHeiner Kallweit1-17/+16
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: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: factor out bbsqi bit to struct chip_descHeiner Kallweit1-7/+4
Factor out the bbsqi bit to struct chip_desc. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-09-01rtc: ds1307: remove member irq from struct ds1307Heiner Kallweit1-7/+5
The irq number is used in the probe function only, so we don't have to store it in struct ds1307. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-08-21rtc: ds1307: fix regmap configHeiner Kallweit1-1/+0
Current max_register setting breaks reading nvram on certain chips and also reading the standard registers on RX8130 where register map starts at 0x10. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Fixes: 11e5890b5342 "rtc: ds1307: convert driver to regmap" Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-07-31rtc: ds1307: remove legacy check for "isil, irq2-can-wakeup-machine" propertyHeiner Kallweit1-7/+1
Commit 8b44f5be20fd ("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: Heiner Kallweit <hkallweit1@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-07-07rtc: ds1307: remove ds1307_removeAlexandre Belloni1-6/+0
ds1307_remove() is now empty, remove it Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-07-07rtc: ds1307: use generic nvmemAlexandre Belloni1-66/+22
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: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-07-07rtc: ds1307: switch to rtc_register_deviceAlexandre Belloni1-2/+7
This removes a possible race condition and crash and allows for further improvement of the driver. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-07-06rtc: ds1307: add ds1308 variantSean Nyekjaer1-0/+12
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: Sean Nyekjaer <sean.nyekjaer@prevas.dk> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-07-06rtc: ds1307: factor out century bit handlingHeiner Kallweit1-46/+27
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: Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-07-05rtc: ds1307: use regmap_update_bits where applicableHeiner Kallweit1-62/+20
After the switch to regmap we can now make use of regmap_update_bits to simplify read/modify/write ops. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-06-24rtc: ds1307: Add support for Epson RX8130CEMarek Vasut1-0/+175
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: Marek 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: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-06-03rtc: ds1307: avoid using rtc-nameAlexandre Belloni1-1/+1
ds1307->rtc->name is a copy of ds1307->name, use it instead. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-05-31rtc: rtc-ds1307: enable support for mcp794xx as a wakeup source without IRQDavid Lowe1-1/+2
This patch extends the fixes for ds1337, ds1339, ds3231 in commit 8bc2a40730ec ("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: David Lowe <dave-lowe@ntlworld.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-05-26rtc: ds1307: convert driver to regmapHeiner Kallweit1-382/+221
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: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-04-14rtc: ds1307: Add m41t0 to OF device ID tableAlexandre Belloni1-0/+4
m41t0 was added to the I2C device ID table but not the OF table. Fix that. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-04-14rtc: ds1307: support m41t0 variantStefan Agner1-0/+13
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: Stefan Agner <stefan@agner.ch> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-03-09rtc: ds1307: Add OF device ID tableJavier Martinez Canillas1-1/+67
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: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-12-19rtc: ds1307: Add ACPI supportTin Huynh1-9/+43
This patch enables ACPI support for rtc-ds1307 driver. Signed-off-by: Tin Huynh <tnhuynh@apm.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-08-31rtc: ds1307: add Intersil ISL12057 supportAlexandre Belloni1-0/+6
Intersil ISL12057 is a drop-in replacement for DS1337. It can be supported by the ds1307 driver. Acked-by: Arnaud Ebalard <arno@natisbad.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-08-31rtc: ds1307: fix century bit supportAlexandre Belloni1-5/+43
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: Arnaud Ebalard <arno@natisbad.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-07-09rtc: simplify implementations of read_alarmUwe Kleine-König1-5/+0
Since commit d68778b80dd7 ("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: Uwe Kleine-König <uwe@kleine-koenig.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-07-09rtc: ds1307: Fix relying on reset value for weekdayKeerthy1-1/+27
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: 1d1945d261a2af "drivers/rtc/rtc-ds1307.c: add alarm support for mcp7941x chips" Signed-off-by: Keerthy <j-keerthy@ti.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-05-20rtc: ds1307: Remove CLK_IS_ROOTStephen Boyd1-2/+0
This flag is a no-op now (see commit 47b0eeb3dc8a "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: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-05-20rtc: ds1307: ensure that any pending alarm is cleared before a new alarm is ↵Nicolas Boullis1-5/+8
enabled 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: Nicolas Boullis <nboullis@debian.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-05-20rtc: ds1307: fix ds1307_native_smbus_read_block_data functionNicolas Boullis1-2/+6
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: Nicolas Boullis <nboullis@debian.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-04-21rtc: ds1307: Use irq when available for wakeup-source deviceNishanth Menon1-1/+1
With commit 8bc2a40730ec ("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: 8bc2a40730ec ("rtc: ds1307: add support for the DT property 'wakeup-source'") Reported-by: Tony Lindgren <tony@atomide.com> Cc: Michael Lange <linuxstuff@milaw.biz> Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-04-21rtc: ds1307: ds3231 temperature s16 overflowZhuang Yuyao1-2/+2
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: Akinobu Mita <akinobu.mita@gmail.com> Tested-by: Michael Tatarinov <kukabu@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-03-14rtc: ds1307: add clock provider support for DS3231Akinobu Mita1-1/+295
DS3231 has programmable square-wave output signal. This enables to use this feature as a clock provider of common clock framework. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Reviewed-by: Michael Turquette <mturquette@baylibre.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-02-04rtc: ds1307: add temperature sensor support for ds3231Akinobu Mita1-0/+88
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: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-02-04rtc: ds1307: add support for the DT property 'wakeup-source'Michael Lange1-2/+27
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: Michael Lange <linuxstuff@milaw.biz> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-01-11rtc: use %ph for short hex dumpsRasmus Villemoes1-13/+4
This makes the generated code slightly smaller. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-11-26rtc: ds1307: fix alarm reading at probe timeSimon Guinot1-5/+7
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: Simon Guinot <simon.guinot@sequanux.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 04:11:51 +0000