rtc: rc5t583: add ricoh rc5t583 RTC driver (90829c08) · Commits · 戴 / test

drivers/rtc/Kconfig

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Original line number	Diff line number	Diff line
		@@ -350,6 +350,16 @@ config RTC_DRV_TPS65910
		This driver can also be built as a module. If so, the module
		will be called rtc-tps65910.

		config RTC_DRV_RC5T583
		tristate "RICOH 5T583 RTC driver"
		depends on MFD_RC5T583
		help
		If you say yes here you get support for the RTC on the
		RICOH 5T583 chips.

		This driver can also be built as a module. If so, the module
		will be called rtc-rc5t583.

		config RTC_DRV_S35390A
		tristate "Seiko Instruments S-35390A"
		select BITREVERSE

drivers/rtc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -87,6 +87,7 @@ obj-$(CONFIG_RTC_DRV_PS3) += rtc-ps3.o
		obj-$(CONFIG_RTC_DRV_PUV3) += rtc-puv3.o
		obj-$(CONFIG_RTC_DRV_PXA) += rtc-pxa.o
		obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
		obj-$(CONFIG_RTC_DRV_RC5T583) += rtc-rc5t583.o
		obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c01.o
		obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
		obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o

drivers/rtc/rtc-rc5t583.c

0 → 100644

+331 −0

Original line number	Diff line number	Diff line
		/*
		* rtc-rc5t583.c -- RICOH RC5T583 Real Time Clock
		*
		* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
		* Author: Venu Byravarasu <vbyravarasu@nvidia.com>
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms and conditions of the GNU General Public License,
		* version 2, as published by the Free Software Foundation.
		*
		* This program is distributed in the hope 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/kernel.h>
		#include <linux/errno.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/types.h>
		#include <linux/rtc.h>
		#include <linux/bcd.h>
		#include <linux/platform_device.h>
		#include <linux/interrupt.h>
		#include <linux/mfd/rc5t583.h>

		struct rc5t583_rtc {
		struct rtc_device *rtc;
		/* To store the list of enabled interrupts, during system suspend */
		u32 irqen;
		};

		/* Total number of RTC registers needed to set time*/
		#define NUM_TIME_REGS (RC5T583_RTC_YEAR - RC5T583_RTC_SEC + 1)

		/* Total number of RTC registers needed to set Y-Alarm*/
		#define NUM_YAL_REGS (RC5T583_RTC_AY_YEAR - RC5T583_RTC_AY_MIN + 1)

		/* Set Y-Alarm interrupt */
		#define SET_YAL BIT(5)

		/* Get Y-Alarm interrupt status*/
		#define GET_YAL_STATUS BIT(3)

		static int rc5t583_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
		{
		struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
		u8 val;

		/* Set Y-Alarm, based on 'enabled' */
		val = enabled ? SET_YAL : 0;

		return regmap_update_bits(rc5t583->regmap, RC5T583_RTC_CTL1, SET_YAL,
		val);
		}

		/*
		* Gets current rc5t583 RTC time and date parameters.
		*
		* The RTC's time/alarm representation is not what gmtime(3) requires
		* Linux to use:
		*
		* - Months are 1..12 vs Linux 0-11
		* - Years are 0..99 vs Linux 1900..N (we assume 21st century)
		*/
		static int rc5t583_rtc_read_time(struct device dev, struct rtc_time tm)
		{
		struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
		u8 rtc_data[NUM_TIME_REGS];
		int ret;

		ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data,
		NUM_TIME_REGS);
		if (ret < 0) {
		dev_err(dev, "RTC read time failed with err:%d\n", ret);
		return ret;
		}

		tm->tm_sec = bcd2bin(rtc_data[0]);
		tm->tm_min = bcd2bin(rtc_data[1]);
		tm->tm_hour = bcd2bin(rtc_data[2]);
		tm->tm_wday = bcd2bin(rtc_data[3]);
		tm->tm_mday = bcd2bin(rtc_data[4]);
		tm->tm_mon = bcd2bin(rtc_data[5]) - 1;
		tm->tm_year = bcd2bin(rtc_data[6]) + 100;

		return ret;
		}

		static int rc5t583_rtc_set_time(struct device dev, struct rtc_time tm)
		{
		struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
		unsigned char rtc_data[NUM_TIME_REGS];
		int ret;

		rtc_data[0] = bin2bcd(tm->tm_sec);
		rtc_data[1] = bin2bcd(tm->tm_min);
		rtc_data[2] = bin2bcd(tm->tm_hour);
		rtc_data[3] = bin2bcd(tm->tm_wday);
		rtc_data[4] = bin2bcd(tm->tm_mday);
		rtc_data[5] = bin2bcd(tm->tm_mon + 1);
		rtc_data[6] = bin2bcd(tm->tm_year - 100);

		ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data,
		NUM_TIME_REGS);
		if (ret < 0) {
		dev_err(dev, "RTC set time failed with error %d\n", ret);
		return ret;
		}

		return ret;
		}

		static int rc5t583_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
		{
		struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
		unsigned char alarm_data[NUM_YAL_REGS];
		u32 interrupt_enable;
		int ret;

		ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data,
		NUM_YAL_REGS);
		if (ret < 0) {
		dev_err(dev, "rtc_read_alarm error %d\n", ret);
		return ret;
		}

		alm->time.tm_min = bcd2bin(alarm_data[0]);
		alm->time.tm_hour = bcd2bin(alarm_data[1]);
		alm->time.tm_mday = bcd2bin(alarm_data[2]);
		alm->time.tm_mon = bcd2bin(alarm_data[3]) - 1;
		alm->time.tm_year = bcd2bin(alarm_data[4]) + 100;

		ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, &interrupt_enable);
		if (ret < 0)
		return ret;

		/* check if YALE is set */
		if (interrupt_enable & SET_YAL)
		alm->enabled = 1;

		return ret;
		}

		static int rc5t583_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
		{
		struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
		unsigned char alarm_data[NUM_YAL_REGS];
		int ret;

		ret = rc5t583_rtc_alarm_irq_enable(dev, 0);
		if (ret)
		return ret;

		alarm_data[0] = bin2bcd(alm->time.tm_min);
		alarm_data[1] = bin2bcd(alm->time.tm_hour);
		alarm_data[2] = bin2bcd(alm->time.tm_mday);
		alarm_data[3] = bin2bcd(alm->time.tm_mon + 1);
		alarm_data[4] = bin2bcd(alm->time.tm_year - 100);

		ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data,
		NUM_YAL_REGS);
		if (ret) {
		dev_err(dev, "rtc_set_alarm error %d\n", ret);
		return ret;
		}

		if (alm->enabled)
		ret = rc5t583_rtc_alarm_irq_enable(dev, 1);

		return ret;
		}

		static irqreturn_t rc5t583_rtc_interrupt(int irq, void *rtc)
		{
		struct device *dev = rtc;
		struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
		struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
		unsigned long events = 0;
		int ret;
		u32 rtc_reg;

		ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL2, &rtc_reg);
		if (ret < 0)
		return IRQ_NONE;

		if (rtc_reg & GET_YAL_STATUS) {
		events = RTC_IRQF \| RTC_AF;
		/* clear pending Y-alarm interrupt bit */
		rtc_reg &= ~GET_YAL_STATUS;
		}

		ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, rtc_reg);
		if (ret)
		return IRQ_NONE;

		/* Notify RTC core on event */
		rtc_update_irq(rc5t583_rtc->rtc, 1, events);

		return IRQ_HANDLED;
		}

		static const struct rtc_class_ops rc5t583_rtc_ops = {
		.read_time = rc5t583_rtc_read_time,
		.set_time = rc5t583_rtc_set_time,
		.read_alarm = rc5t583_rtc_read_alarm,
		.set_alarm = rc5t583_rtc_set_alarm,
		.alarm_irq_enable = rc5t583_rtc_alarm_irq_enable,
		};

		static int __devinit rc5t583_rtc_probe(struct platform_device *pdev)
		{
		struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
		struct rc5t583_rtc *ricoh_rtc;
		struct rc5t583_platform_data *pmic_plat_data;
		int ret;
		int irq;

		ricoh_rtc = devm_kzalloc(&pdev->dev, sizeof(struct rc5t583_rtc),
		GFP_KERNEL);
		if (!ricoh_rtc)
		return -ENOMEM;

		platform_set_drvdata(pdev, ricoh_rtc);

		/* Clear pending interrupts */
		ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, 0);
		if (ret < 0)
		return ret;

		/* clear RTC Adjust register */
		ret = regmap_write(rc5t583->regmap, RC5T583_RTC_ADJ, 0);
		if (ret < 0) {
		dev_err(&pdev->dev, "unable to program rtc_adjust reg\n");
		return -EBUSY;
		}

		pmic_plat_data = dev_get_platdata(rc5t583->dev);
		irq = pmic_plat_data->irq_base;
		if (irq <= 0) {
		dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
		irq);
		return ret;
		}

		irq += RC5T583_IRQ_YALE;
		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
		rc5t583_rtc_interrupt, IRQF_TRIGGER_LOW,
		"rtc-rc5t583", &pdev->dev);
		if (ret < 0) {
		dev_err(&pdev->dev, "IRQ is not free.\n");
		return ret;
		}
		device_init_wakeup(&pdev->dev, 1);

		ricoh_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
		&rc5t583_rtc_ops, THIS_MODULE);
		if (IS_ERR(ricoh_rtc->rtc)) {
		ret = PTR_ERR(ricoh_rtc->rtc);
		dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
		return ret;
		}

		return 0;
		}

		/*
		* Disable rc5t583 RTC interrupts.
		* Sets status flag to free.
		*/
		static int __devexit rc5t583_rtc_remove(struct platform_device *pdev)
		{
		struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(&pdev->dev);

		rc5t583_rtc_alarm_irq_enable(&rc5t583_rtc->rtc->dev, 0);

		rtc_device_unregister(rc5t583_rtc->rtc);
		return 0;
		}

		#ifdef CONFIG_PM_SLEEP

		static int rc5t583_rtc_suspend(struct device *dev)
		{
		struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
		struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
		int ret;

		/* Store current list of enabled interrupts*/
		ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1,
		&rc5t583_rtc->irqen);
		return ret;
		}

		static int rc5t583_rtc_resume(struct device *dev)
		{
		struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
		struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);

		/* Restore list of enabled interrupts before suspend */
		return regmap_write(rc5t583->regmap, RC5T583_RTC_CTL1,
		rc5t583_rtc->irqen);
		}

		static const struct dev_pm_ops rc5t583_rtc_pm_ops = {
		.suspend = rc5t583_rtc_suspend,
		.resume = rc5t583_rtc_resume,
		};

		#define DEV_PM_OPS (&rc5t583_rtc_pm_ops)
		#else
		#define DEV_PM_OPS NULL
		#endif

		static struct platform_driver rc5t583_rtc_driver = {
		.probe = rc5t583_rtc_probe,
		.remove = __devexit_p(rc5t583_rtc_remove),
		.driver = {
		.owner = THIS_MODULE,
		.name = "rtc-rc5t583",
		.pm = DEV_PM_OPS,
		},
		};

		module_platform_driver(rc5t583_rtc_driver);
		MODULE_ALIAS("platform:rtc-rc5t583");
		MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
		MODULE_LICENSE("GPL v2");

include/linux/mfd/rc5t583.h

+22 −0

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		@@ -146,6 +146,28 @@
		#define RC5T583_GPIO_MON_IOIN 0xAB
		#define RC5T583_GPIO_GPOFUNC 0xAC

		/* RTC registers */
		#define RC5T583_RTC_SEC 0xE0
		#define RC5T583_RTC_MIN 0xE1
		#define RC5T583_RTC_HOUR 0xE2
		#define RC5T583_RTC_WDAY 0xE3
		#define RC5T583_RTC_DAY 0xE4
		#define RC5T583_RTC_MONTH 0xE5
		#define RC5T583_RTC_YEAR 0xE6
		#define RC5T583_RTC_ADJ 0xE7
		#define RC5T583_RTC_AW_MIN 0xE8
		#define RC5T583_RTC_AW_HOUR 0xE9
		#define RC5T583_RTC_AW_WEEK 0xEA
		#define RC5T583_RTC_AD_MIN 0xEB
		#define RC5T583_RTC_AD_HOUR 0xEC
		#define RC5T583_RTC_CTL1 0xED
		#define RC5T583_RTC_CTL2 0xEE
		#define RC5T583_RTC_AY_MIN 0xF0
		#define RC5T583_RTC_AY_HOUR 0xF1
		#define RC5T583_RTC_AY_DAY 0xF2
		#define RC5T583_RTC_AY_MONTH 0xF3
		#define RC5T583_RTC_AY_YEAR 0xF4

		/* RICOH_RC5T583 IRQ definitions */
		enum {
		RC5T583_IRQ_ONKEY,

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