Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 0101e53c authored by Laxman Dewangan's avatar Laxman Dewangan Committed by Samuel Ortiz
Browse files

rtc: palmas: Add RTC driver Palmas series PMIC 



TI Palmas series PMIC support the RTC and alarm functionality.
Add RTC driver with alarm support for this device.

Signed-off-by: default avatarLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 3d50a278

drivers/rtc/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -269,6 +269,16 @@ config RTC_DRV_X1205 
	  This driver can also be built as a module. If so, the module

	  will be called rtc-x1205.



config RTC_DRV_PALMAS

	tristate "TI Palmas RTC driver"

	depends on MFD_PALMAS

	help

	  If you say yes here you get support for the RTC of TI PALMA series PMIC

	  chips.



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

	  will be called rtc-palma.



config RTC_DRV_PCF8523

	tristate "NXP PCF8523"

	help

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -76,6 +76,7 @@ obj-$(CONFIG_RTC_DRV_MPC5121) += rtc-mpc5121.o 
obj-$(CONFIG_RTC_DRV_MV)	+= rtc-mv.o

obj-$(CONFIG_RTC_DRV_NUC900)	+= rtc-nuc900.o

obj-$(CONFIG_RTC_DRV_OMAP)	+= rtc-omap.o

obj-$(CONFIG_RTC_DRV_PALMAS)	+= rtc-palmas.o

obj-$(CONFIG_RTC_DRV_PCAP)	+= rtc-pcap.o

obj-$(CONFIG_RTC_DRV_PCF8523)	+= rtc-pcf8523.o

obj-$(CONFIG_RTC_DRV_PCF8563)	+= rtc-pcf8563.o

drivers/rtc/rtc-palmas.c

0 → 100644
+339 −0
Original line number Diff line number Diff line 
/*

 * rtc-palmas.c -- Palmas Real Time Clock driver.



 * RTC driver for TI Palma series devices like TPS65913,

 * TPS65914 power management IC.

 *

 * Copyright (c) 2012, NVIDIA Corporation.

 *

 * Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,

 * whether express or implied; 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

 * 02111-1307, USA

 */



#include <linux/bcd.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/mfd/palmas.h>

#include <linux/module.h>

#include <linux/rtc.h>

#include <linux/types.h>

#include <linux/platform_device.h>

#include <linux/pm.h>



struct palmas_rtc {

	struct rtc_device	*rtc;

	struct device		*dev;

	unsigned int		irq;

};



/* Total number of RTC registers needed to set time*/

#define PALMAS_NUM_TIME_REGS	(PALMAS_YEARS_REG - PALMAS_SECONDS_REG + 1)



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

{

	unsigned char rtc_data[PALMAS_NUM_TIME_REGS];

	struct palmas *palmas = dev_get_drvdata(dev->parent);

	int ret;



	/* Copy RTC counting registers to static registers or latches */

	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,

		PALMAS_RTC_CTRL_REG_GET_TIME, PALMAS_RTC_CTRL_REG_GET_TIME);

	if (ret < 0) {

		dev_err(dev, "RTC CTRL reg update failed, err: %d\n", ret);

		return ret;

	}



	ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG,

			rtc_data, PALMAS_NUM_TIME_REGS);

	if (ret < 0) {

		dev_err(dev, "RTC_SECONDS reg read failed, 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_mday = bcd2bin(rtc_data[3]);

	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;

	tm->tm_year = bcd2bin(rtc_data[5]) + 100;



	return ret;

}



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

{

	unsigned char rtc_data[PALMAS_NUM_TIME_REGS];

	struct palmas *palmas = dev_get_drvdata(dev->parent);

	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_mday);

	rtc_data[4] = bin2bcd(tm->tm_mon + 1);

	rtc_data[5] = bin2bcd(tm->tm_year - 100);



	/* Stop RTC while updating the RTC time registers */

	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,

		PALMAS_RTC_CTRL_REG_STOP_RTC, 0);

	if (ret < 0) {

		dev_err(dev, "RTC stop failed, err = %d\n", ret);

		return ret;

	}



	ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG,

		rtc_data, PALMAS_NUM_TIME_REGS);

	if (ret < 0) {

		dev_err(dev, "RTC_SECONDS reg write failed, err = %d\n", ret);

		return ret;

	}



	/* Start back RTC */

	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,

		PALMAS_RTC_CTRL_REG_STOP_RTC, PALMAS_RTC_CTRL_REG_STOP_RTC);

	if (ret < 0)

		dev_err(dev, "RTC start failed, err = %d\n", ret);

	return ret;

}



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

{

	struct palmas *palmas = dev_get_drvdata(dev->parent);

	u8 val;



	val = enabled ? PALMAS_RTC_INTERRUPTS_REG_IT_ALARM : 0;

	return palmas_write(palmas, PALMAS_RTC_BASE,

		PALMAS_RTC_INTERRUPTS_REG, val);

}



static int palmas_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)

{

	unsigned char alarm_data[PALMAS_NUM_TIME_REGS];

	u32 int_val;

	struct palmas *palmas = dev_get_drvdata(dev->parent);

	int ret;



	ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE,

			PALMAS_ALARM_SECONDS_REG,

			alarm_data, PALMAS_NUM_TIME_REGS);

	if (ret < 0) {

		dev_err(dev, "RTC_ALARM_SECONDS read failed, err = %d\n", ret);

		return ret;

	}



	alm->time.tm_sec = bcd2bin(alarm_data[0]);

	alm->time.tm_min = bcd2bin(alarm_data[1]);

	alm->time.tm_hour = bcd2bin(alarm_data[2]);

	alm->time.tm_mday = bcd2bin(alarm_data[3]);

	alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;

	alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;



	ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_INTERRUPTS_REG,

			&int_val);

	if (ret < 0) {

		dev_err(dev, "RTC_INTERRUPTS reg read failed, err = %d\n", ret);

		return ret;

	}



	if (int_val & PALMAS_RTC_INTERRUPTS_REG_IT_ALARM)

		alm->enabled = 1;

	return ret;

}



static int palmas_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)

{

	unsigned char alarm_data[PALMAS_NUM_TIME_REGS];

	struct palmas *palmas = dev_get_drvdata(dev->parent);

	int ret;



	ret = palmas_rtc_alarm_irq_enable(dev, 0);

	if (ret < 0) {

		dev_err(dev, "Disable RTC alarm failed\n");

		return ret;

	}



	alarm_data[0] = bin2bcd(alm->time.tm_sec);

	alarm_data[1] = bin2bcd(alm->time.tm_min);

	alarm_data[2] = bin2bcd(alm->time.tm_hour);

	alarm_data[3] = bin2bcd(alm->time.tm_mday);

	alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);

	alarm_data[5] = bin2bcd(alm->time.tm_year - 100);



	ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE,

		PALMAS_ALARM_SECONDS_REG, alarm_data, PALMAS_NUM_TIME_REGS);

	if (ret < 0) {

		dev_err(dev, "ALARM_SECONDS_REG write failed, err = %d\n", ret);

		return ret;

	}



	if (alm->enabled)

		ret = palmas_rtc_alarm_irq_enable(dev, 1);

	return ret;

}



static int palmas_clear_interrupts(struct device *dev)

{

	struct palmas *palmas = dev_get_drvdata(dev->parent);

	unsigned int rtc_reg;

	int ret;



	ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG,

				&rtc_reg);

	if (ret < 0) {

		dev_err(dev, "RTC_STATUS read failed, err = %d\n", ret);

		return ret;

	}



	ret = palmas_write(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG,

			rtc_reg);

	if (ret < 0) {

		dev_err(dev, "RTC_STATUS write failed, err = %d\n", ret);

		return ret;

	}

	return 0;

}



static irqreturn_t palmas_rtc_interrupt(int irq, void *context)

{

	struct palmas_rtc *palmas_rtc = context;

	struct device *dev = palmas_rtc->dev;

	int ret;



	ret = palmas_clear_interrupts(dev);

	if (ret < 0) {

		dev_err(dev, "RTC interrupt clear failed, err = %d\n", ret);

		return IRQ_NONE;

	}



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

	return IRQ_HANDLED;

}



static struct rtc_class_ops palmas_rtc_ops = {

	.read_time	= palmas_rtc_read_time,

	.set_time	= palmas_rtc_set_time,

	.read_alarm	= palmas_rtc_read_alarm,

	.set_alarm	= palmas_rtc_set_alarm,

	.alarm_irq_enable = palmas_rtc_alarm_irq_enable,

};



static int palmas_rtc_probe(struct platform_device *pdev)

{

	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);

	struct palmas_rtc *palmas_rtc = NULL;

	int ret;



	palmas_rtc = devm_kzalloc(&pdev->dev, sizeof(struct palmas_rtc),

			GFP_KERNEL);

	if (!palmas_rtc)

		return -ENOMEM;



	/* Clear pending interrupts */

	ret = palmas_clear_interrupts(&pdev->dev);

	if (ret < 0) {

		dev_err(&pdev->dev, "clear RTC int failed, err = %d\n", ret);

		return ret;

	}



	palmas_rtc->dev = &pdev->dev;

	platform_set_drvdata(pdev, palmas_rtc);



	/* Start RTC */

	ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,

			PALMAS_RTC_CTRL_REG_STOP_RTC,

			PALMAS_RTC_CTRL_REG_STOP_RTC);

	if (ret < 0) {

		dev_err(&pdev->dev, "RTC_CTRL write failed, err = %d\n", ret);

		return ret;

	}



	palmas_rtc->irq = platform_get_irq(pdev, 0);



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

				&palmas_rtc_ops, THIS_MODULE);

	if (IS_ERR(palmas_rtc->rtc)) {

		ret = PTR_ERR(palmas_rtc->rtc);

		dev_err(&pdev->dev, "RTC register failed, err = %d\n", ret);

		return ret;

	}



	ret = request_threaded_irq(palmas_rtc->irq, NULL,

			palmas_rtc_interrupt,

			IRQF_TRIGGER_LOW | IRQF_ONESHOT |

			IRQF_EARLY_RESUME,

			dev_name(&pdev->dev), palmas_rtc);

	if (ret < 0) {

		dev_err(&pdev->dev, "IRQ request failed, err = %d\n", ret);

		rtc_device_unregister(palmas_rtc->rtc);

		return ret;

	}



	device_set_wakeup_capable(&pdev->dev, 1);

	return 0;

}



static int palmas_rtc_remove(struct platform_device *pdev)

{

	struct palmas_rtc *palmas_rtc = platform_get_drvdata(pdev);



	palmas_rtc_alarm_irq_enable(&pdev->dev, 0);

	free_irq(palmas_rtc->irq, palmas_rtc);

	rtc_device_unregister(palmas_rtc->rtc);

	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int palmas_rtc_suspend(struct device *dev)

{

	struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev);



	if (device_may_wakeup(dev))

		enable_irq_wake(palmas_rtc->irq);

	return 0;

}



static int palmas_rtc_resume(struct device *dev)

{

	struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev);



	if (device_may_wakeup(dev))

		disable_irq_wake(palmas_rtc->irq);

	return 0;

}

#endif



static const struct dev_pm_ops palmas_rtc_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(palmas_rtc_suspend, palmas_rtc_resume)

};



static struct platform_driver palmas_rtc_driver = {

	.probe		= palmas_rtc_probe,

	.remove		= palmas_rtc_remove,

	.driver		= {

		.owner	= THIS_MODULE,

		.name	= "palmas-rtc",

		.pm	= &palmas_rtc_pm_ops,

	},

};



module_platform_driver(palmas_rtc_driver);



MODULE_ALIAS("platform:palmas_rtc");

MODULE_DESCRIPTION("TI PALMAS series RTC driver");

MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");

MODULE_LICENSE("GPL v2");