[V1,3/6] rtc: da9062: DA9062 RTC driver

Message ID	860a3b6dc7f8dac95c0e36967f24551af8805f7b.1429280614.git.stwiss.opensource@diasemi.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-input-owner@kernel.org> Message-ID: <860a3b6dc7f8dac95c0e36967f24551af8805f7b.1429280614.git.stwiss.opensource@diasemi.com> In-Reply-To: <cover.1429280614.git.stwiss.opensource@diasemi.com> References: <cover.1429280614.git.stwiss.opensource@diasemi.com> From: S Twiss <stwiss.opensource@diasemi.com> Date: Fri, 17 Apr 2015 15:23:33 +0100 Subject: [PATCH V1 3/6] rtc: da9062: DA9062 RTC driver To: Alessandro Zummo <a.zummo@towertech.it>, LINUXKERNEL <linux-kernel@vger.kernel.org>, RTCLINUX <rtc-linux@googlegroups.com> CC: DEVICETREE <devicetree@vger.kernel.org>, David Dajun Chen <david.chen@diasemi.com>, Dmitry Torokhov <dmitry.torokhov@gmail.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Kumar Gala <galak@codeaurora.org>, LINUXINPUT <linux-input@vger.kernel.org>, LINUXWATCHDOG <linux-watchdog@vger.kernel.org>, Lee Jones <lee.jones@linaro.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Pawel Moll <pawel.moll@arm.com>, Rob Herring <robh+dt@kernel.org>, S Twiss <stwiss.opensource@diasemi.com>, Samuel Ortiz <sameo@linux.intel.com>, Support Opensource <support.opensource@diasemi.com>, Wim Van Sebroeck <wim@iguana.be> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-input-owner@vger.kernel.org Precedence: bulk

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index b5b5c3d..c4d21bd 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -927,6 +927,16 @@ config RTC_DRV_DA9055 This driver can also be built as a module. If so, the module will be called rtc-da9055 +config RTC_DRV_DA9062 + tristate "Dialog Semiconductor DA9062 RTC" + depends on MFD_DA9062 + help + If you say yes here you will get support for the RTC subsystem + of the Dialog Semiconductor DA9062. + + This driver can also be built as a module. If so, the module + will be called "rtc-da9062". + config RTC_DRV_DA9063 tristate "Dialog Semiconductor DA9063 RTC" depends on MFD_DA9063 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 69c8706..9108e62 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o obj-$(CONFIG_RTC_DRV_DA9052) += rtc-da9052.o obj-$(CONFIG_RTC_DRV_DA9055) += rtc-da9055.o +obj-$(CONFIG_RTC_DRV_DA9062) += rtc-da9062.o obj-$(CONFIG_RTC_DRV_DA9063) += rtc-da9063.o obj-$(CONFIG_RTC_DRV_DAVINCI) += rtc-davinci.o obj-$(CONFIG_RTC_DRV_DM355EVM) += rtc-dm355evm.o diff --git a/drivers/rtc/rtc-da9062.c b/drivers/rtc/rtc-da9062.c new file mode 100644 index 0000000..0f3d646 --- /dev/null +++ b/drivers/rtc/rtc-da9062.c @@ -0,0 +1,367 @@ +/* + * rtc-da9062.c - RTC device driver for DA9062 + * Copyright (C) 2015 Dialog Semiconductor Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * 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. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/rtc.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/regmap.h> +#include <linux/mfd/da9062/registers.h> +#include <linux/mfd/da9062/core.h> + +#define DA9062_GET_TIME_RETRIES 5 + +#define YEARS_TO_DA9062(year) ((year) - 100) +#define MONTHS_TO_DA9062(month) ((month) + 1) +#define YEARS_FROM_DA9062(year) ((year) + 100) +#define MONTHS_FROM_DA9062(month) ((month) - 1) + +#define RTC_DATA_LEN (DA9062AA_COUNT_Y - DA9062AA_COUNT_S + 1) +enum { + RTC_SEC = 0, + RTC_MIN = 1, + RTC_HOUR = 2, + RTC_DAY = 3, + RTC_MONTH = 4, + RTC_YEAR = 5, +}; + +#define DA9062AA_ALARM_STATUS_ENUM_TIMER (0x02 << 6) + +struct da9062_rtc { + struct rtc_device *rtc_dev; + struct da9062 *hw; + struct rtc_time alarm_time; + bool rtc_sync; +}; + +static void da9062_data_to_tm(u8 *data, struct rtc_time *tm) +{ + tm->tm_sec = data[RTC_SEC] & DA9062AA_COUNT_SEC_MASK; + tm->tm_min = data[RTC_MIN] & DA9062AA_COUNT_MIN_MASK; + tm->tm_hour = data[RTC_HOUR] & DA9062AA_COUNT_HOUR_MASK; + tm->tm_mday = data[RTC_DAY] & DA9062AA_COUNT_DAY_MASK; + tm->tm_mon = MONTHS_FROM_DA9062(data[RTC_MONTH] & + DA9062AA_COUNT_MONTH_MASK); + tm->tm_year = YEARS_FROM_DA9062(data[RTC_YEAR] & + DA9062AA_COUNT_YEAR_MASK); +} + +static void da9062_tm_to_data(struct rtc_time *tm, u8 *data) +{ + data[RTC_SEC] &= ~DA9062AA_COUNT_SEC_MASK; + data[RTC_SEC] |= tm->tm_sec & DA9062AA_COUNT_SEC_MASK; + + data[RTC_MIN] &= ~DA9062AA_COUNT_MIN_MASK; + data[RTC_MIN] |= tm->tm_min & DA9062AA_COUNT_MIN_MASK; + + data[RTC_HOUR] &= ~DA9062AA_COUNT_HOUR_MASK; + data[RTC_HOUR] |= tm->tm_hour & DA9062AA_COUNT_HOUR_MASK; + + data[RTC_DAY] &= ~DA9062AA_COUNT_DAY_MASK; + data[RTC_DAY] |= tm->tm_mday & DA9062AA_COUNT_DAY_MASK; + + data[RTC_MONTH] &= ~DA9062AA_COUNT_MONTH_MASK; + data[RTC_MONTH] |= MONTHS_TO_DA9062(tm->tm_mon) & + DA9062AA_COUNT_MONTH_MASK; + + data[RTC_YEAR] &= ~DA9062AA_COUNT_YEAR_MASK; + data[RTC_YEAR] |= YEARS_TO_DA9062(tm->tm_year) & + DA9062AA_COUNT_YEAR_MASK; +} + +static int da9062_rtc_stop_alarm(struct device *dev) +{ + struct da9062_rtc *rtc = dev_get_drvdata(dev); + + return regmap_update_bits(rtc->hw->regmap, + DA9062AA_ALARM_Y, + DA9062AA_ALARM_ON_MASK, + 0); +} + +static int da9062_rtc_start_alarm(struct device *dev) +{ + struct da9062_rtc *rtc = dev_get_drvdata(dev); + + return regmap_update_bits(rtc->hw->regmap, + DA9062AA_ALARM_Y, + DA9062AA_ALARM_ON_MASK, + DA9062AA_ALARM_ON_MASK); +} + +static int da9062_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct da9062_rtc *rtc = dev_get_drvdata(dev); + unsigned long tm_secs; + unsigned long al_secs; + u8 data[RTC_DATA_LEN]; + int timeout = DA9062_GET_TIME_RETRIES; + bool read_done = false; + int ret; + + while (timeout--) { + ret = regmap_bulk_read(rtc->hw->regmap, DA9062AA_COUNT_S, + data, RTC_DATA_LEN); + if (ret < 0) { + dev_err(dev, "Failed to read RTC time data: %d\n", ret); + return ret; + } + + /* rtc ready to be read by the host */ + if (data[RTC_SEC] & DA9062AA_RTC_READ_MASK) { + timeout = 0; + read_done = true; + } + + msleep(20); + } + + if (!read_done) { + dev_err(dev, "Failed to read the RTC time\n"); + return -EIO; + } + + da9062_data_to_tm(data, tm); + + rtc_tm_to_time(tm, &tm_secs); + rtc_tm_to_time(&rtc->alarm_time, &al_secs); + + /* handle the rtc synchronisation delay */ + if (rtc->rtc_sync == true && al_secs - tm_secs == 1) + memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time)); + else + rtc->rtc_sync = false; + + return rtc_valid_tm(tm); +} + +static int da9062_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct da9062_rtc *rtc = dev_get_drvdata(dev); + u8 data[RTC_DATA_LEN]; + int ret; + + da9062_tm_to_data(tm, data); + ret = regmap_bulk_write(rtc->hw->regmap, DA9062AA_COUNT_S, + data, RTC_DATA_LEN); + if (ret < 0) + dev_err(dev, "Failed to set RTC time data: %d\n", ret); + + return ret; +} + +static int da9062_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct da9062_rtc *rtc = dev_get_drvdata(dev); + u8 data[RTC_DATA_LEN]; + int ret; + unsigned int val; + + data[RTC_SEC] = 0; + ret = regmap_bulk_read(rtc->hw->regmap, DA9062AA_ALARM_S, + &data[RTC_SEC], RTC_DATA_LEN); + if (ret < 0) + return ret; + + da9062_data_to_tm(data, &alrm->time); + + alrm->enabled = !!(data[RTC_YEAR] & DA9062AA_ALARM_ON_MASK); + + ret = regmap_read(rtc->hw->regmap, DA9062AA_EVENT_A, &val); + if (ret < 0) + return ret; + + if (val & DA9062AA_M_ALARM_MASK) + alrm->pending = 1; + else + alrm->pending = 0; + + return 0; +} + +static int da9062_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct da9062_rtc *rtc = dev_get_drvdata(dev); + u8 data[RTC_DATA_LEN]; + int ret; + + da9062_tm_to_data(&alrm->time, data); + + ret = da9062_rtc_stop_alarm(dev); + if (ret < 0) { + dev_err(dev, "Failed to stop alarm: %d\n", ret); + return ret; + } + + ret = regmap_bulk_write(rtc->hw->regmap, DA9062AA_ALARM_S, + &data[RTC_SEC], RTC_DATA_LEN); + if (ret < 0) { + dev_err(dev, "Failed to write alarm: %d\n", ret); + return ret; + } + + da9062_data_to_tm(data, &rtc->alarm_time); + + if (alrm->enabled) { + ret = da9062_rtc_start_alarm(dev); + if (ret < 0) { + dev_err(dev, "Failed to start alarm: %d\n", ret); + return ret; + } + } + + return ret; +} + +static int da9062_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + if (enabled) + return da9062_rtc_start_alarm(dev); + else + return da9062_rtc_stop_alarm(dev); +} + +static irqreturn_t da9062_alarm_event(int irq, void *data) +{ + struct da9062_rtc *rtc = data; + + regmap_update_bits(rtc->hw->regmap, + DA9062AA_ALARM_Y, + DA9062AA_ALARM_ON_MASK, + 0); + + rtc->rtc_sync = true; + rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); + + return IRQ_HANDLED; +} + +static const struct rtc_class_ops da9062_rtc_ops = { + .read_time = da9062_rtc_read_time, + .set_time = da9062_rtc_set_time, + .read_alarm = da9062_rtc_read_alarm, + .set_alarm = da9062_rtc_set_alarm, + .alarm_irq_enable = da9062_rtc_alarm_irq_enable, +}; + +static int da9062_rtc_probe(struct platform_device *pdev) +{ + struct da9062 *chip = dev_get_drvdata(pdev->dev.parent); + struct da9062_rtc *rtc; + int irq_alarm; + u8 data[RTC_DATA_LEN]; + int ret; + + ret = regmap_update_bits(chip->regmap, + DA9062AA_CONTROL_E, + DA9062AA_RTC_EN_MASK, + DA9062AA_RTC_EN_MASK); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to enable RTC\n"); + return ret; + } + + ret = regmap_update_bits(chip->regmap, + DA9062AA_EN_32K, + DA9062AA_CRYSTAL_MASK, + DA9062AA_CRYSTAL_MASK); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n"); + return ret; + } + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + ret = regmap_update_bits(chip->regmap, + DA9062AA_ALARM_S, + DA9062AA_ALARM_STATUS_MASK, + 0); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to access RTC alarm register\n"); + return ret; + } + + ret = regmap_update_bits(chip->regmap, + DA9062AA_ALARM_S, + DA9062AA_ALARM_STATUS_ENUM_TIMER, + DA9062AA_ALARM_STATUS_ENUM_TIMER); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to access RTC alarm register\n"); + return ret; + } + + ret = regmap_update_bits(chip->regmap, + DA9062AA_ALARM_Y, + DA9062AA_TICK_ON_MASK, + 0); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to disable TICKs\n"); + return ret; + } + + data[RTC_SEC] = 0; + ret = regmap_bulk_read(chip->regmap, DA9062AA_ALARM_S, + &data[RTC_SEC], RTC_DATA_LEN); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n", + ret); + return ret; + } + + platform_set_drvdata(pdev, rtc); + + irq_alarm = platform_get_irq_byname(pdev, "ALARM"); + ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL, + da9062_alarm_event, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "ALARM", rtc); + if (ret) { + dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n", + irq_alarm, ret); + return ret; + } + + rtc->hw = chip; + rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "da9062-rtc", + &da9062_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc->rtc_dev)) + return PTR_ERR(rtc->rtc_dev); + + da9062_data_to_tm(data, &rtc->alarm_time); + rtc->rtc_sync = false; + return ret; +} + +static struct platform_driver da9062_rtc_driver = { + .probe = da9062_rtc_probe, + .driver = { + .name = "da9062-rtc", + .owner = THIS_MODULE, + }, +}; + +module_platform_driver(da9062_rtc_driver); + +MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); +MODULE_DESCRIPTION("RTC device driver for Dialog DA9062"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform: da9062-rtc");

[V1,3/6] rtc: da9062: DA9062 RTC driver

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