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Commit 6920d996 authored by Ashish Jangam's avatar Ashish Jangam Committed by Linus Torvalds
Browse files

rtc: DA9055 RTC driver 



A driver for the DA9055 PMIC.  This has a dependency upon the DA9055 MFD
core.

Functionally tested on Samsung SMDKV6410.

Signed-off-by: default avatarDavid Dajun Chen <dchen@diasemi.com>
Signed-off-by: default avatarAshish Jangam <ashish.jangam@kpitcummins.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 04a373fd

drivers/rtc/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -609,6 +609,16 @@ config RTC_DRV_DA9052 
	  Say y here to support the RTC driver for Dialog Semiconductor

	  DA9052-BC and DA9053-AA/Bx PMICs.



config RTC_DRV_DA9055

	tristate "Dialog Semiconductor DA9055 RTC"

	depends on MFD_DA9055

	help

	  If you say yes here you will get support for the

	  RTC of the Dialog DA9055 PMIC.



	  This driver can also be built as a module. If so, the module

	  will be called rtc-da9055



config RTC_DRV_EFI

	tristate "EFI RTC"

	depends on IA64

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ obj-$(CONFIG_RTC_DRV_BQ4802) += rtc-bq4802.o 
obj-$(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_DAVINCI)	+= rtc-davinci.o

obj-$(CONFIG_RTC_DRV_DM355EVM)	+= rtc-dm355evm.o

obj-$(CONFIG_RTC_DRV_VRTC)	+= rtc-mrst.o

drivers/rtc/rtc-da9055.c

0 → 100644
+413 −0
Original line number Diff line number Diff line 
/*

 * Real time clock driver for DA9055

 *

 * Copyright(c) 2012 Dialog Semiconductor Ltd.

 *

 * Author: Dajun Dajun Chen <dajun.chen@diasemi.com>

 *

 * 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.

 *

 */



#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>



#include <linux/mfd/da9055/core.h>

#include <linux/mfd/da9055/reg.h>

#include <linux/mfd/da9055/pdata.h>



struct da9055_rtc {

	struct rtc_device *rtc;

	struct da9055 *da9055;

	int alarm_enable;

};



static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)

{

	int ret;

	if (enable) {

		ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,

					DA9055_RTC_ALM_EN,

					DA9055_RTC_ALM_EN);

		if (ret != 0)

			dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",

				ret);

		rtc->alarm_enable = 1;

	} else {

		ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,

					DA9055_RTC_ALM_EN, 0);

		if (ret != 0)

			dev_err(rtc->da9055->dev,

				"Failed to disable ALM: %d\n", ret);

		rtc->alarm_enable = 0;

	}

	return ret;

}



static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)

{

	struct da9055_rtc *rtc = data;



	da9055_rtc_enable_alarm(rtc, 0);

	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);



	return IRQ_HANDLED;

}



static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)

{

	int ret;

	uint8_t v[5];



	ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);

	if (ret != 0) {

		dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);

		return ret;

	}



	rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;

	rtc_tm->tm_mon  = (v[3] & DA9055_RTC_ALM_MONTH) - 1;

	rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;

	rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;

	rtc_tm->tm_min  = v[0] & DA9055_RTC_ALM_MIN;



	return rtc_valid_tm(rtc_tm);

}



static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)

{

	int ret;

	uint8_t v[2];



	rtc_tm->tm_year -= 100;

	rtc_tm->tm_mon += 1;



	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,

				DA9055_RTC_ALM_MIN, rtc_tm->tm_min);

	if (ret != 0) {

		dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);

		return ret;

	}



	v[0] = rtc_tm->tm_hour;

	v[1] = rtc_tm->tm_mday;



	ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);

	if (ret < 0)

		return ret;



	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,

				DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);

	if (ret < 0)

		dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);



	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,

				DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);

	if (ret < 0)

		dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);



	return ret;

}



static int da9055_rtc_get_alarm_status(struct da9055 *da9055)

{

	int ret;



	ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);

	if (ret < 0) {

		dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);

		return ret;

	}

	ret &= DA9055_RTC_ALM_EN;

	return (ret > 0) ? 1 : 0;

}



static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)

{

	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	uint8_t v[6];

	int ret;



	ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);

	if (ret < 0)

		return ret;



	/*

	 * Registers are only valid when RTC_READ

	 * status bit is asserted

	 */

	if (!(ret & DA9055_RTC_READ))

		return -EBUSY;



	ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);

	if (ret < 0) {

		dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",

			ret);

		return ret;

	}



	rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;

	rtc_tm->tm_mon  = (v[4] & DA9055_RTC_MONTH) - 1;

	rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;

	rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;

	rtc_tm->tm_min  = v[1] & DA9055_RTC_MIN;

	rtc_tm->tm_sec  = v[0] & DA9055_RTC_SEC;



	return rtc_valid_tm(rtc_tm);

}



static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm)

{

	struct da9055_rtc *rtc;

	uint8_t v[6];



	rtc = dev_get_drvdata(dev);



	v[0] = tm->tm_sec;

	v[1] = tm->tm_min;

	v[2] = tm->tm_hour;

	v[3] = tm->tm_mday;

	v[4] = tm->tm_mon + 1;

	v[5] = tm->tm_year - 100;



	return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);

}



static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)

{

	int ret;

	struct rtc_time *tm = &alrm->time;

	struct da9055_rtc *rtc = dev_get_drvdata(dev);



	ret = da9055_read_alarm(rtc->da9055, tm);



	if (ret)

		return ret;



	alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);



	return 0;

}



static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)

{

	int ret;

	struct rtc_time *tm = &alrm->time;

	struct da9055_rtc *rtc = dev_get_drvdata(dev);



	ret = da9055_rtc_enable_alarm(rtc, 0);

	if (ret < 0)

		return ret;



	ret = da9055_set_alarm(rtc->da9055, tm);

	if (ret)

		return ret;



	ret = da9055_rtc_enable_alarm(rtc, 1);



	return ret;

}



static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)

{

	struct da9055_rtc *rtc = dev_get_drvdata(dev);



	return da9055_rtc_enable_alarm(rtc, enabled);

}



static const struct rtc_class_ops da9055_rtc_ops = {

	.read_time	= da9055_rtc_read_time,

	.set_time	= da9055_rtc_set_time,

	.read_alarm	= da9055_rtc_read_alarm,

	.set_alarm	= da9055_rtc_set_alarm,

	.alarm_irq_enable = da9055_rtc_alarm_irq_enable,

};



static int __init da9055_rtc_device_init(struct da9055 *da9055,

					struct da9055_pdata *pdata)

{

	int ret;



	/* Enable RTC and the internal Crystal */

	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,

				DA9055_RTC_EN, DA9055_RTC_EN);

	if (ret < 0)

		return ret;

	ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,

				DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);

	if (ret < 0)

		return ret;



	/* Enable RTC in Power Down mode */

	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,

				DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);

	if (ret < 0)

		return ret;



	/* Enable RTC in Reset mode */

	if (pdata && pdata->reset_enable) {

		ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,

					DA9055_RTC_MODE_SD,

					DA9055_RTC_MODE_SD <<

					DA9055_RTC_MODE_SD_SHIFT);

		if (ret < 0)

			return ret;

	}



	/* Disable the RTC TICK ALM */

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,

				DA9055_RTC_TICK_WAKE_MASK, 0);

	if (ret < 0)

		return ret;



	return 0;

}



static int da9055_rtc_probe(struct platform_device *pdev)

{

	struct da9055_rtc *rtc;

	struct da9055_pdata *pdata = NULL;

	int ret, alm_irq;



	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);

	if (!rtc)

		return -ENOMEM;



	rtc->da9055 = dev_get_drvdata(pdev->dev.parent);

	pdata = rtc->da9055->dev->platform_data;

	platform_set_drvdata(pdev, rtc);



	ret = da9055_rtc_device_init(rtc->da9055, pdata);

	if (ret < 0)

		goto err_rtc;



	ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);

	if (ret < 0)

		goto err_rtc;



	if (ret & DA9055_RTC_ALM_EN)

		rtc->alarm_enable = 1;



	device_init_wakeup(&pdev->dev, 1);



	rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,

					&da9055_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc->rtc)) {

		ret = PTR_ERR(rtc->rtc);

		goto err_rtc;

	}



	alm_irq = platform_get_irq_byname(pdev, "ALM");

	alm_irq = regmap_irq_get_virq(rtc->da9055->irq_data, alm_irq);

	ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,

					da9055_rtc_alm_irq,

					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,

					"ALM", rtc);

	if (ret != 0)

		dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);



err_rtc:

	return ret;



}



static int da9055_rtc_remove(struct platform_device *pdev)

{

	struct da9055_rtc *rtc = pdev->dev.platform_data;



	rtc_device_unregister(rtc->rtc);

	platform_set_drvdata(pdev, NULL);



	return 0;

}



#ifdef CONFIG_PM

/* Turn off the alarm if it should not be a wake source. */

static int da9055_rtc_suspend(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);

	int ret;



	if (!device_may_wakeup(&pdev->dev)) {

		/* Disable the ALM IRQ */

		ret = da9055_rtc_enable_alarm(rtc, 0);

		if (ret < 0)

			dev_err(&pdev->dev, "Failed to disable RTC ALM\n");

	}



	return 0;

}



/* Enable the alarm if it should be enabled (in case it was disabled to

 * prevent use as a wake source).

 */

static int da9055_rtc_resume(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);

	int ret;



	if (!device_may_wakeup(&pdev->dev)) {

		if (rtc->alarm_enable) {

			ret = da9055_rtc_enable_alarm(rtc, 1);

			if (ret < 0)

				dev_err(&pdev->dev,

					"Failed to restart RTC ALM\n");

		}

	}



	return 0;

}



/* Unconditionally disable the alarm */

static int da9055_rtc_freeze(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);

	int ret;



	ret = da9055_rtc_enable_alarm(rtc, 0);

	if (ret < 0)

		dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");



	return 0;



}

#else

#define da9055_rtc_suspend NULL

#define da9055_rtc_resume NULL

#define da9055_rtc_freeze NULL

#endif



static const struct dev_pm_ops da9055_rtc_pm_ops = {

	.suspend = da9055_rtc_suspend,

	.resume = da9055_rtc_resume,



	.freeze = da9055_rtc_freeze,

	.thaw = da9055_rtc_resume,

	.restore = da9055_rtc_resume,



	.poweroff = da9055_rtc_suspend,

};



static struct platform_driver da9055_rtc_driver = {

	.probe  = da9055_rtc_probe,

	.remove = da9055_rtc_remove,

	.driver = {

		.name   = "da9055-rtc",

		.owner  = THIS_MODULE,

		.pm = &da9055_rtc_pm_ops,

	},

};



module_platform_driver(da9055_rtc_driver);



MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");

MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:da9055-rtc");