Signed-off-by: Jeppe Ledet-Pedersen <jlp@xxxxxxxxxxxx> --- MAINTAINERS | 1 + drivers/rtc/Kconfig | 10 +++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-fm33256b.c | 166 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 178 insertions(+) create mode 100644 drivers/rtc/rtc-fm33256b.c diff --git a/MAINTAINERS b/MAINTAINERS index a8b71d8..9ccc285 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3388,6 +3388,7 @@ S: Maintained F: include/linux/mfd/fm33256b.h F: drivers/mfd/fm33256b.c F: drivers/misc/eeprom/fm33256b-fram.c +F: drivers/rtc/rtc-fm33256b.c CYTTSP TOUCHSCREEN DRIVER M: Ferruh Yigit <fery@xxxxxxxxxxx> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 3e84315..7856f0b 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -740,6 +740,16 @@ config RTC_DRV_MCP795 This driver can also be built as a module. If so the module will be called rtc-mcp795. +config RTC_DRV_FM33256B + tristate "Cypress FM33256B RTC support" + depends on MFD_FM33256B + help + If you say Y here you will get support for the RTC found in the + Cypress FM33256B Processor Companion. + + This driver can also be built as a module. If so the module + will be called rtc-fm33256b. + endif # SPI_MASTER # diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index ea28337..1478fb6 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -64,6 +64,7 @@ obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o obj-$(CONFIG_RTC_DRV_EM3027) += rtc-em3027.o obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o obj-$(CONFIG_RTC_DRV_FM3130) += rtc-fm3130.o +obj-$(CONFIG_RTC_DRV_FM33256B) += rtc-fm33256b.o obj-$(CONFIG_RTC_DRV_GEMINI) += rtc-gemini.o obj-$(CONFIG_RTC_DRV_GENERIC) += rtc-generic.o obj-$(CONFIG_RTC_DRV_HID_SENSOR_TIME) += rtc-hid-sensor-time.o diff --git a/drivers/rtc/rtc-fm33256b.c b/drivers/rtc/rtc-fm33256b.c new file mode 100644 index 0000000..a9650d4 --- /dev/null +++ b/drivers/rtc/rtc-fm33256b.c @@ -0,0 +1,166 @@ +/* + * Cypress FM33256B Processor Companion RTC Driver + * + * Copyright (C) 2016 GomSpace ApS + * + * 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 distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/mfd/fm33256b.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/rtc.h> +#include <linux/bcd.h> + +struct fm33256b_rtc { + struct fm33256b *fm33256b; + struct rtc_device *rtcdev; +}; + +static int fm33256b_rtc_readtime(struct device *dev, struct rtc_time *tm) +{ + int ret; + struct fm33256b_rtc *rtc = dev_get_drvdata(dev); + uint8_t time[7]; + + /* Lock time update */ + ret = regmap_update_bits(rtc->fm33256b->regmap_pc, + FM33256B_RTC_ALARM_CONTROL_REG, + FM33256B_R, FM33256B_R); + if (ret < 0) + return ret; + + ret = regmap_bulk_read(rtc->fm33256b->regmap_pc, + FM33256B_SECONDS_REG, time, sizeof(time)); + if (ret < 0) + return ret; + + /* Unlock time update */ + ret = regmap_update_bits(rtc->fm33256b->regmap_pc, + FM33256B_RTC_ALARM_CONTROL_REG, + FM33256B_R, 0); + if (ret < 0) + return ret; + + tm->tm_sec = bcd2bin(time[0]); + tm->tm_min = bcd2bin(time[1]); + tm->tm_hour = bcd2bin(time[2]); + tm->tm_wday = bcd2bin(time[3]) - 1; + tm->tm_mday = bcd2bin(time[4]); + tm->tm_mon = bcd2bin(time[5]) - 1; + tm->tm_year = bcd2bin(time[6]); + + if (tm->tm_year < 70) + tm->tm_year += 100; + + return rtc_valid_tm(tm); +} + +static int fm33256b_rtc_settime(struct device *dev, struct rtc_time *tm) +{ + int ret; + struct fm33256b_rtc *rtc = dev_get_drvdata(dev); + uint8_t time[7]; + + time[0] = bin2bcd(tm->tm_sec); + time[1] = bin2bcd(tm->tm_min); + time[2] = bin2bcd(tm->tm_hour); + time[3] = bin2bcd(tm->tm_wday + 1); + time[4] = bin2bcd(tm->tm_mday); + time[5] = bin2bcd(tm->tm_mon + 1); + time[6] = bin2bcd(tm->tm_year % 100); + + /* Unlock time update */ + ret = regmap_update_bits(rtc->fm33256b->regmap_pc, + FM33256B_RTC_ALARM_CONTROL_REG, + FM33256B_W, FM33256B_W); + if (ret < 0) + return ret; + + ret = regmap_bulk_write(rtc->fm33256b->regmap_pc, + FM33256B_SECONDS_REG, time, sizeof(time)); + if (ret < 0) + return ret; + + /* Lock time update */ + ret = regmap_update_bits(rtc->fm33256b->regmap_pc, + FM33256B_RTC_ALARM_CONTROL_REG, + FM33256B_W, 0); + if (ret < 0) + return ret; + + return 0; +} + +static const struct rtc_class_ops fm33256b_rtc_ops = { + .read_time = fm33256b_rtc_readtime, + .set_time = fm33256b_rtc_settime, +}; + +static int fm33256b_rtc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct fm33256b *fm33256b; + struct fm33256b_rtc *rtc; + + fm33256b = dev_get_drvdata(dev->parent); + + rtc = devm_kzalloc(dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + platform_set_drvdata(pdev, rtc); + + rtc->fm33256b = fm33256b; + rtc->rtcdev = devm_rtc_device_register(&pdev->dev, KBUILD_MODNAME, + &fm33256b_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc->rtcdev)) + return PTR_ERR(rtc->rtcdev); + + return 0; +} + +static int fm33256b_rtc_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct fm33256b *fm33256b; + struct fm33256b_rtc *rtc = platform_get_drvdata(pdev); + + fm33256b = dev_get_drvdata(dev->parent); + + devm_rtc_device_unregister(&pdev->dev, rtc->rtcdev); + + return 0; +} + +static const struct of_device_id fm33256b_rtc_dt_ids[] = { + { .compatible = "cypress,fm33256b-rtc" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, fm33256b_rtc_dt_ids); + +static struct platform_driver fm33256b_rtc_driver = { + .driver = { + .name = "fm33256b-rtc", + .of_match_table = fm33256b_rtc_dt_ids, + }, + .probe = fm33256b_rtc_probe, + .remove = fm33256b_rtc_remove, +}; +module_platform_driver(fm33256b_rtc_driver); + +MODULE_ALIAS("platform:fm33256b-rtc"); +MODULE_AUTHOR("Jeppe Ledet-Pedersen <jlp@xxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Cypress FM33256B Processor Companion RTC Driver"); +MODULE_LICENSE("GPL v2"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
