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path: root/drivers/rtc/rtc-mcp795.c
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2021-10-02rtc: mcp795: Add SPI ID tableMark Brown1-0/+7
Currently autoloading for SPI devices does not use the DT ID table, it uses SPI modalises. Supporting OF modalises is going to be difficult if not impractical, an attempt was made but has been reverted, so ensure that module autoloading works for this driver by adding an id_table listing the SPI IDs for everything. Fixes: 96c8395e2166 ("spi: Revert modalias changes") Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20210927130240.33693-1-broonie@kernel.org
2021-01-26rtc: mcp795: use rtc_lock/rtc_unlockAlexandre Belloni1-3/+2
Avoid accessing directly rtc->ops_lock and use the RTC core helpers. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20210119220653.677750-9-alexandre.belloni@bootlin.com
2020-07-16rtc: Replace HTTP links with HTTPS onesAlexander A. Klimov1-1/+1
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `\bxmlns\b`: For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20200706062727.18481-1-grandmaster@al2klimov.de
2019-06-19treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500Thomas Gleixner1-5/+1
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-12-11rtc: mcp795: Switch to use %ptRAndy Shevchenko1-12/+6
Use %ptR instead of open coded variant to print content of struct rtc_time in human readable format. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-03-17rtc: remove VLA usageGustavo A. R. Silva1-1/+1
In preparation to enabling -Wvla, remove VLA and replace it with a fixed-length array instead. >From a security viewpoint, the use of Variable Length Arrays can be a vector for stack overflow attacks. Also, in general, as the code evolves it is easy to lose track of how big a VLA can get. Thus, we can end up having segfaults that are hard to debug. Also, fixed as part of the directive to remove all VLAs from the kernel: https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-03-02rtc: stop validating rtc_time in .read_timeAlexandre Belloni1-1/+1
The RTC core is always calling rtc_valid_tm after the read_time callback. It is not necessary to call it just before returning from the callback. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2017-01-11rtc: mcp795: add alarm support.Emil Bartczak1-1/+170
This patch adds alarm support. This allows to configure the chip to generate an interrupt when the alarm matches current time value. Alarm can be programmed up to one year in the future and is accurate to the second. Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2017-01-11rtc: mcp795: Add support for weekday.Emil Bartczak1-5/+7
This patch adds support for saving/loading weekday value from the chip. Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-12-19rtc: mcp795: Fix whitespace and indentation.Emil Bartczak1-6/+6
Fix whitespace and indentation errors and the following checkpatch warnings: - line 15: Block comments use a trailing */ on a separate line - line 256: Line over 80 characters No code change. Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-12-19rtc: mcp795: Prefer using the BIT() macro.Emil Bartczak1-2/+2
This patch doesn't change the code but replaces all bitmask values with the BIT(x) macro. Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-12-19rtc: mcp795: fix month write resetting date to 1.Emil Bartczak1-5/+81
According to Microchip errata some combinations of date and month values may result in the date being reset to 1, even if the date is also written with the month (for example 31-07 or 31-08). As a workaround avoid writing date and month values within the same Write command. Instead, terminate the Write command after loading the date and begin a new command to write the month. In addition, disable the oscillator before loading the new values. This is done by ensuring both the ST and EXTOSC bits are cleared and waiting for the OSCON bit to clear. Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-12-19rtc: mcp795: fix time range difference between linux and RTC chip.Emil Bartczak1-2/+2
In linux rtc_time struct, tm_mon range is 0~11, while in RTC HW REG, month range is 1~12. This patch adjusts difference of them. Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-12-19rtc: mcp795: fix bitmask value for leap year (LP).Emil Bartczak1-1/+2
According the datasheet the leap year is a fifth bit in month register. Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-12-19rtc: mcp795: use bcd2bin/bin2bcd.Emil Bartczak1-12/+13
Change rtc-mcp795.c to use the bcd2bin/bin2bcd functions. This change fixes the wrong conversion of month value from binary to BCD (missing right shift operation for 10 month). Signed-off-by: Emil Bartczak <emilbart@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-09-02rtc: constify rtc_class_ops structuresJulia Lawall1-1/+1
Check for rtc_class_ops structures that are only passed to devm_rtc_device_register, rtc_device_register, platform_device_register_data, all of which declare the corresponding parameter as const. Declare rtc_class_ops structures that have these properties as const. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r disable optional_qualifier@ identifier i; position p; @@ static struct rtc_class_ops i@p = { ... }; @ok@ identifier r.i; expression e1,e2,e3,e4; position p; @@ ( devm_rtc_device_register(e1,e2,&i@p,e3) | rtc_device_register(e1,e2,&i@p,e3) | platform_device_register_data(e1,e2,e3,&i@p,e4) ) @bad@ position p != {r.p,ok.p}; identifier r.i; @@ i@p @depends on !bad disable optional_qualifier@ identifier r.i; @@ static +const struct rtc_class_ops i = { ... }; // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Baruch Siach <baruch@tkos.co.il> Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-03-22rtc: mcp795: add devicetree supportEmil Bartczak1-0/+10
Add device tree support to the rtc-mcp795 driver. Signed-off-by: Emil Bartczak <emilbart@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-10-28spi: Drop owner assignment from spi_driversAndrew F. Davis1-1/+0
An spi_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Andrew F. Davis <afd@ti.com> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-06-07drivers/rtc: add support for Microchip MCP795Josef Gajdusek1-0/+199
Add driver for SPI RTC Microchip MCP795. Only supports saving/loading time from the chip (i. e. no alarms/power events/ID). Signed-off-by: Josef Gajdusek <atx@atx.name> Cc: Jingoo Han <jg1.han@samsung.com> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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