Commit fef931ff authored by Ashish Jangam's avatar Ashish Jangam Committed by Linus Torvalds
Browse files

rtc: driver for DA9052/53 PMIC v1 



RTC Driver for Dialog Semiconductor DA9052/53 PMICs.

This patch is functionally tested on Samsung SMDKV6410.

[akpm@linux-foundation.org: clean up file header layout, remove unneeded initialisation of local arrays]
Signed-off-by: default avatarDavid Dajun Chen <dchen@diasemi.com>
Signed-off-by: default avatarAshish Jangam <ashish.jangam@kpitcummins.com>
Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
Cc: David Dajun Chen <dchen@diasemi.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fad0738d

drivers/rtc/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -554,6 +554,13 @@ config RTC_DRV_DS1742 
	  This driver can also be built as a module. If so, the module

	  will be called rtc-ds1742.



config RTC_DRV_DA9052

	tristate "Dialog DA9052/DA9053 RTC"

	depends on PMIC_DA9052

	help

	  Say y here to support the RTC driver for Dialog Semiconductor

	  DA9052-BC and DA9053-AA/Bx PMICs.



config RTC_DRV_EFI

	tristate "EFI RTC"

	depends on IA64

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ obj-$(CONFIG_RTC_DRV_BQ32K) += rtc-bq32k.o 
obj-$(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_DAVINCI)	+= rtc-davinci.o

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

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

drivers/rtc/rtc-da9052.c

0 → 100644
+293 −0
Original line number Diff line number Diff line 
/*

 * Real time clock driver for DA9052

 *

 * 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/da9052/da9052.h>

#include <linux/mfd/da9052/reg.h>



#define rtc_err(da9052, fmt, ...) \

		dev_err(da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)



struct da9052_rtc {

	struct rtc_device *rtc;

	struct da9052 *da9052;

	int irq;

};



static int da9052_rtc_enable_alarm(struct da9052 *da9052, bool enable)

{

	int ret;

	if (enable) {

		ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,

					DA9052_ALARM_Y_ALARM_ON,

					DA9052_ALARM_Y_ALARM_ON);

		if (ret != 0)

			rtc_err(da9052, "Failed to enable ALM: %d\n", ret);

	} else {

		ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,

					DA9052_ALARM_Y_ALARM_ON, 0);

		if (ret != 0)

			rtc_err(da9052, "Write error: %d\n", ret);

	}

	return ret;

}



static irqreturn_t da9052_rtc_irq(int irq, void *data)

{

	struct da9052_rtc *rtc = data;

	int ret;



	ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_MI_REG);

	if (ret < 0) {

		rtc_err(rtc->da9052, "Read error: %d\n", ret);

		return IRQ_NONE;

	}



	if (ret & DA9052_ALARMMI_ALARMTYPE) {

		da9052_rtc_enable_alarm(rtc->da9052, 0);

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

	} else

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



	return IRQ_HANDLED;

}



static int da9052_read_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm)

{

	int ret;

	uint8_t v[5];



	ret = da9052_group_read(da9052, DA9052_ALARM_MI_REG, 5, v);

	if (ret != 0) {

		rtc_err(da9052, "Failed to group read ALM: %d\n", ret);

		return ret;

	}



	rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100;

	rtc_tm->tm_mon  = (v[3] & DA9052_RTC_MONTH) - 1;

	rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY;

	rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR;

	rtc_tm->tm_min  = v[0] & DA9052_RTC_MIN;



	ret = rtc_valid_tm(rtc_tm);

	if (ret != 0)

		return ret;

	return ret;

}



static int da9052_set_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm)

{

	int ret;

	uint8_t v[3];



	rtc_tm->tm_year -= 100;

	rtc_tm->tm_mon += 1;



	ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,

				DA9052_RTC_MIN, rtc_tm->tm_min);

	if (ret != 0) {

		rtc_err(da9052, "Failed to write ALRM MIN: %d\n", ret);

		return ret;

	}



	v[0] = rtc_tm->tm_hour;

	v[1] = rtc_tm->tm_mday;

	v[2] = rtc_tm->tm_mon;



	ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);

	if (ret < 0)

		return ret;



	ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,

				DA9052_RTC_YEAR, rtc_tm->tm_year);

	if (ret != 0)

		rtc_err(da9052, "Failed to write ALRM YEAR: %d\n", ret);



	return ret;

}



static int da9052_rtc_get_alarm_status(struct da9052 *da9052)

{

	int ret;



	ret = da9052_reg_read(da9052, DA9052_ALARM_Y_REG);

	if (ret < 0) {

		rtc_err(da9052, "Failed to read ALM: %d\n", ret);

		return ret;

	}

	ret &= DA9052_ALARM_Y_ALARM_ON;

	return (ret > 0) ? 1 : 0;

}



static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)

{

	struct da9052_rtc *rtc = dev_get_drvdata(dev);

	uint8_t v[6];

	int ret;



	ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v);

	if (ret < 0) {

		rtc_err(rtc->da9052, "Failed to read RTC time : %d\n", ret);

		return ret;

	}



	rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100;

	rtc_tm->tm_mon  = (v[4] & DA9052_RTC_MONTH) - 1;

	rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY;

	rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR;

	rtc_tm->tm_min  = v[1] & DA9052_RTC_MIN;

	rtc_tm->tm_sec  = v[0] & DA9052_RTC_SEC;



	ret = rtc_valid_tm(rtc_tm);

	if (ret != 0) {

		rtc_err(rtc->da9052, "rtc_valid_tm failed: %d\n", ret);

		return ret;

	}



	return 0;

}



static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)

{

	struct da9052_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 da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);

}



static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)

{

	int ret;

	struct rtc_time *tm = &alrm->time;

	struct da9052_rtc *rtc = dev_get_drvdata(dev);



	ret = da9052_read_alarm(rtc->da9052, tm);



	if (ret)

		return ret;



	alrm->enabled = da9052_rtc_get_alarm_status(rtc->da9052);



	return 0;

}



static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)

{

	int ret;

	struct rtc_time *tm = &alrm->time;

	struct da9052_rtc *rtc = dev_get_drvdata(dev);



	ret = da9052_rtc_enable_alarm(rtc->da9052, 0);

	if (ret < 0)

		return ret;



	ret = da9052_set_alarm(rtc->da9052, tm);

	if (ret)

		return ret;



	ret = da9052_rtc_enable_alarm(rtc->da9052, 1);



	return ret;

}



static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)

{

	struct da9052_rtc *rtc = dev_get_drvdata(dev);



	return da9052_rtc_enable_alarm(rtc->da9052, enabled);

}



static const struct rtc_class_ops da9052_rtc_ops = {

	.read_time	= da9052_rtc_read_time,

	.set_time	= da9052_rtc_set_time,

	.read_alarm	= da9052_rtc_read_alarm,

	.set_alarm	= da9052_rtc_set_alarm,

	.alarm_irq_enable = da9052_rtc_alarm_irq_enable,

};



static int __devinit da9052_rtc_probe(struct platform_device *pdev)

{

	struct da9052_rtc *rtc;

	int ret;



	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);

	if (!rtc)

		return -ENOMEM;



	rtc->da9052 = dev_get_drvdata(pdev->dev.parent);

	platform_set_drvdata(pdev, rtc);

	rtc->irq = platform_get_irq_byname(pdev, "ALM");

	ret = request_threaded_irq(rtc->irq, NULL, da9052_rtc_irq,

				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,

				   "ALM", rtc);

	if (ret != 0) {

		rtc_err(rtc->da9052, "irq registration failed: %d\n", ret);

		goto err_mem;

	}



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

				       &da9052_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc->rtc)) {

		ret = PTR_ERR(rtc->rtc);

		goto err_free_irq;

	}



	return 0;



err_free_irq:

	free_irq(rtc->irq, rtc);

err_mem:

	devm_kfree(&pdev->dev, rtc);

	return ret;

}



static int __devexit da9052_rtc_remove(struct platform_device *pdev)

{

	struct da9052_rtc *rtc = pdev->dev.platform_data;



	rtc_device_unregister(rtc->rtc);

	free_irq(rtc->irq, rtc);

	platform_set_drvdata(pdev, NULL);

	devm_kfree(&pdev->dev, rtc);



	return 0;

}



static struct platform_driver da9052_rtc_driver = {

	.probe	= da9052_rtc_probe,

	.remove	= __devexit_p(da9052_rtc_remove),

	.driver = {

		.name	= "da9052-rtc",

		.owner	= THIS_MODULE,

	},

};



module_platform_driver(da9052_rtc_driver);



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

MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:da9052-rtc");

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