Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/limits.h>
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/mfd/88pm886.h>
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/*
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* Time is calculated as the sum of a 32-bit read-only advancing counter and a
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* writeable constant offset stored in the chip's spare registers.
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*/
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static int pm886_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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u32 time;
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u32 buf;
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int ret;
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ret = regmap_bulk_read(regmap, PM886_REG_RTC_SPARE1, &buf, 4);
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if (ret)
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return ret;
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time = buf;
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ret = regmap_bulk_read(regmap, PM886_REG_RTC_CNT1, &buf, 4);
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if (ret)
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return ret;
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time += buf;
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rtc_time64_to_tm(time, tm);
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return 0;
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}
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static int pm886_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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u32 buf;
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int ret;
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ret = regmap_bulk_read(regmap, PM886_REG_RTC_CNT1, &buf, 4);
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if (ret)
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return ret;
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buf = rtc_tm_to_time64(tm) - buf;
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return regmap_bulk_write(regmap, PM886_REG_RTC_SPARE1, &buf, 4);
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}
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static const struct rtc_class_ops pm886_rtc_ops = {
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.read_time = pm886_rtc_read_time,
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.set_time = pm886_rtc_set_time,
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};
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static int pm886_rtc_probe(struct platform_device *pdev)
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{
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struct pm886_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct device *dev = &pdev->dev;
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struct rtc_device *rtc;
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int ret;
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platform_set_drvdata(pdev, chip->regmap);
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rtc = devm_rtc_allocate_device(dev);
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if (IS_ERR(rtc))
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return dev_err_probe(dev, PTR_ERR(rtc),
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"Failed to allocate RTC device\n");
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rtc->ops = &pm886_rtc_ops;
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rtc->range_max = U32_MAX;
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ret = devm_rtc_register_device(rtc);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to register RTC device\n");
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return 0;
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}
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static const struct platform_device_id pm886_rtc_id_table[] = {
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{ "88pm886-rtc", },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, pm886_rtc_id_table);
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static struct platform_driver pm886_rtc_driver = {
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.driver = {
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.name = "88pm886-rtc",
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},
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.probe = pm886_rtc_probe,
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.id_table = pm886_rtc_id_table,
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};
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module_platform_driver(pm886_rtc_driver);
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MODULE_DESCRIPTION("Marvell 88PM886 RTC driver");
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MODULE_AUTHOR("Karel Balej <balejk@matfyz.cz>");
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MODULE_LICENSE("GPL");
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