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path: root/drivers/rtc/rtc-abx80x.c
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* rtc: abx80x: use devm_add_action_or_reset()Sudip Mukherjee2016-07-191-7/+5
| | | | | | | | | | If devm_add_action() fails we are explicitly calling the cleanup to free the resources allocated. Lets use the helper devm_add_action_or_reset() and return directly in case of error, as we know that the cleanup function has been already called by the helper if there was any error. Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
* rtc: abx80x: handle the oscillator failure bitMylène Josserand2016-03-251-2/+31
| | | | | | | | | | Handle the Oscillator Failure ('OF') bit from Oscillator Status register (0x1D). This bit is cleared on set_time function and is read each time the date/time is read, but only in case of XT Oscillator selection. In RC mode, this bit is always set. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
* rtc: abx80x: handle autocalibrationMylène Josserand2016-03-251-0/+219
| | | | | | | | | | | | | | | | | | | | | | The autocalibration is separated in two bits to set in Oscillator Control register (0x1c) : - OSEL bit to select the oscillator type (XT or RC). - ACAL bit to select the autocalibration type. These functionnalities are exported in sysfs entries : "oscillator" and "autocalibration". Respectively, the values are "xtal" for XT oscillator and "rc" for RC oscillator and 0 to disable the autocalibration cycle, 512 for a 512 seconds autocalibration cycle and 1024 for a cycle of 1024 seconds. Examples : Set to XT Oscillator echo xtal > /sys/class/rtc/rtc0/device/oscillator Activate an autocalibration every 512 seconds echo 512 > /sys/class/rtc/rtc0/device/autocalibration Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
* rtc: abx80x: add alarm supportAlexandre Belloni2016-01-111-4/+141
| | | | | | Add alarm support to the abx80x driver. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
* rtc: abx80x: Add Microcrystal rv1805 supportAlexandre Belloni2016-01-111-0/+1
| | | | | | Microcrystal RV-1805 is compatible with Abracon 1805. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
* rtc: abx80x: fix RTC write bitMitja Spes2015-09-051-1/+1
| | | | | | | | Fix RTC write bit as per application manual Cc: stable@vger.kernel.org # 4.1+ Signed-off-by: Mitja Spes <mitja@lxnav.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
* rtc: add rtc-abx80x, a driver for the Abracon AB x80x i2c rtcPhilippe De Muyter2015-05-051-0/+307
This is a basic driver for the ultra-low-power Abracon AB x80x series of RTC chips. It supports in particular, the supersets AB0805 and AB1805. It allows reading and writing the time, and enables the supercapacitor/ battery charger. [arnd@arndb.de: abx805 depends on i2c] [alexandre.belloni@free-electrons.com: renam buffer from date to buf in abx80x_rtc_read_time()] Signed-off-by: Philippe De Muyter <phdm@macqel.be> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Paul Bolle <pebolle@tiscali.nl> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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