drivers/rtc/rtc-as3722.c - linux - Git at Google

 /*
  * rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs
  *
  * Copyright (C) 2013 ams AG
  * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
  *
  * Author: Florian Lobmaier <florian.lobmaier@ams.com>
  * 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; 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/bcd.h>
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/ioctl.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mfd/as3722.h>
 #include <linux/platform_device.h>
 #include <linux/rtc.h>
 #include <linux/time.h>

 #define AS3722_RTC_START_YEAR	  2000
 struct as3722_rtc {
 	struct rtc_device	*rtc;
 	struct device		*dev;
 	struct as3722		*as3722;
 	int			alarm_irq;
 	bool			irq_enable;
 };

 static void as3722_time_to_reg(u8 *rbuff, struct rtc_time *tm)
 {
 	rbuff[0] = bin2bcd(tm->tm_sec);
 	rbuff[1] = bin2bcd(tm->tm_min);
 	rbuff[2] = bin2bcd(tm->tm_hour);
 	rbuff[3] = bin2bcd(tm->tm_mday);
 	rbuff[4] = bin2bcd(tm->tm_mon + 1);
 	rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
 }

 static void as3722_reg_to_time(u8 *rbuff, struct rtc_time *tm)
 {
 	tm->tm_sec = bcd2bin(rbuff[0] & 0x7F);
 	tm->tm_min = bcd2bin(rbuff[1] & 0x7F);
 	tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);
 	tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);
 	tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1;
 	tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
 	return;
 }

 static int as3722_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
 	struct as3722 *as3722 = as3722_rtc->as3722;
 	u8 as_time_array[6];
 	int ret;

 	ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
 			6, as_time_array);
 	if (ret < 0) {
 		dev_err(dev, "RTC_SECOND reg block read failed %d\n", ret);
 		return ret;
 	}
 	as3722_reg_to_time(as_time_array, tm);
 	return 0;
 }

 static int as3722_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
 	struct as3722 *as3722 = as3722_rtc->as3722;
 	u8 as_time_array[6];
 	int ret;

 	if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900))
 		return -EINVAL;

 	as3722_time_to_reg(as_time_array, tm);
 	ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
 			as_time_array);
 	if (ret < 0)
 		dev_err(dev, "RTC_SECOND reg block write failed %d\n", ret);
 	return ret;
 }

 static int as3722_rtc_alarm_irq_enable(struct device *dev,
 		unsigned int enabled)
 {
 	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

 	if (enabled && !as3722_rtc->irq_enable) {
 		enable_irq(as3722_rtc->alarm_irq);
 		as3722_rtc->irq_enable = true;
 	} else if (!enabled && as3722_rtc->irq_enable)  {
 		disable_irq(as3722_rtc->alarm_irq);
 		as3722_rtc->irq_enable = false;
 	}
 	return 0;
 }

 static int as3722_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
 	struct as3722 *as3722 = as3722_rtc->as3722;
 	u8 as_time_array[6];
 	int ret;

 	ret = as3722_block_read(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
 			as_time_array);
 	if (ret < 0) {
 		dev_err(dev, "RTC_ALARM_SECOND block read failed %d\n", ret);
 		return ret;
 	}

 	as3722_reg_to_time(as_time_array, &alrm->time);
 	return 0;
 }

 static int as3722_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
 	struct as3722 *as3722 = as3722_rtc->as3722;
 	u8 as_time_array[6];
 	int ret;

 	if (alrm->time.tm_year < (AS3722_RTC_START_YEAR - 1900))
 		return -EINVAL;

 	ret = as3722_rtc_alarm_irq_enable(dev, 0);
 	if (ret < 0) {
 		dev_err(dev, "Disable RTC alarm failed\n");
 		return ret;
 	}

 	as3722_time_to_reg(as_time_array, &alrm->time);
 	ret = as3722_block_write(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
 			as_time_array);
 	if (ret < 0) {
 		dev_err(dev, "RTC_ALARM_SECOND block write failed %d\n", ret);
 		return ret;
 	}

 	if (alrm->enabled)
 		ret = as3722_rtc_alarm_irq_enable(dev, alrm->enabled);
 	return ret;
 }

 static irqreturn_t as3722_alarm_irq(int irq, void *data)
 {
 	struct as3722_rtc *as3722_rtc = data;

 	rtc_update_irq(as3722_rtc->rtc, 1, RTC_IRQF | RTC_AF);
 	return IRQ_HANDLED;
 }

 static const struct rtc_class_ops as3722_rtc_ops = {
 	.read_time = as3722_rtc_read_time,
 	.set_time = as3722_rtc_set_time,
 	.read_alarm = as3722_rtc_read_alarm,
 	.set_alarm = as3722_rtc_set_alarm,
 	.alarm_irq_enable = as3722_rtc_alarm_irq_enable,
 };

 static int as3722_rtc_probe(struct platform_device *pdev)
 {
 	struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
 	struct as3722_rtc *as3722_rtc;
 	int ret;

 	as3722_rtc = devm_kzalloc(&pdev->dev, sizeof(*as3722_rtc), GFP_KERNEL);
 	if (!as3722_rtc)
 		return -ENOMEM;

 	as3722_rtc->as3722 = as3722;
 	as3722_rtc->dev = &pdev->dev;
 	platform_set_drvdata(pdev, as3722_rtc);

 	/* Enable the RTC to make sure it is running. */
 	ret = as3722_update_bits(as3722, AS3722_RTC_CONTROL_REG,
 			AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN,
 			AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "RTC_CONTROL reg write failed: %d\n", ret);
 		return ret;
 	}

 	device_init_wakeup(&pdev->dev, 1);

 	as3722_rtc->rtc = devm_rtc_device_register(&pdev->dev, "as3722-rtc",
 				&as3722_rtc_ops, THIS_MODULE);
 	if (IS_ERR(as3722_rtc->rtc)) {
 		ret = PTR_ERR(as3722_rtc->rtc);
 		dev_err(&pdev->dev, "RTC register failed: %d\n", ret);
 		return ret;
 	}

 	as3722_rtc->alarm_irq = platform_get_irq(pdev, 0);
 	dev_info(&pdev->dev, "RTC interrupt %d\n", as3722_rtc->alarm_irq);

 	ret = devm_request_threaded_irq(&pdev->dev, as3722_rtc->alarm_irq, NULL,
 			as3722_alarm_irq, IRQF_ONESHOT,
 			"rtc-alarm", as3722_rtc);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
 				as3722_rtc->alarm_irq, ret);
 		return ret;
 	}
 	disable_irq(as3722_rtc->alarm_irq);
 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int as3722_rtc_suspend(struct device *dev)
 {
 	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev))
 		enable_irq_wake(as3722_rtc->alarm_irq);

 	return 0;
 }

 static int as3722_rtc_resume(struct device *dev)
 {
 	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev))
 		disable_irq_wake(as3722_rtc->alarm_irq);
 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend,
 			 as3722_rtc_resume);

 static struct platform_driver as3722_rtc_driver = {
 	.probe = as3722_rtc_probe,
 	.driver = {
 		.name = "as3722-rtc",
 		.pm = &as3722_rtc_pm_ops,
 	},
 };
 module_platform_driver(as3722_rtc_driver);

 MODULE_DESCRIPTION("RTC driver for AS3722 PMICs");
 MODULE_ALIAS("platform:as3722-rtc");
 MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 MODULE_LICENSE("GPL");
	/*
	* rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs
	*
	* Copyright (C) 2013 ams AG
	* Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
	*
	* Author: Florian Lobmaier <florian.lobmaier@ams.com>
	* 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; 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/bcd.h>
	#include <linux/completion.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/ioctl.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mfd/as3722.h>
	#include <linux/platform_device.h>
	#include <linux/rtc.h>
	#include <linux/time.h>

	#define AS3722_RTC_START_YEAR 2000
	struct as3722_rtc {
	struct rtc_device *rtc;
	struct device *dev;
	struct as3722 *as3722;
	int alarm_irq;
	bool irq_enable;
	};

	static void as3722_time_to_reg(u8 rbuff, struct rtc_time tm)
	{
	rbuff[0] = bin2bcd(tm->tm_sec);
	rbuff[1] = bin2bcd(tm->tm_min);
	rbuff[2] = bin2bcd(tm->tm_hour);
	rbuff[3] = bin2bcd(tm->tm_mday);
	rbuff[4] = bin2bcd(tm->tm_mon + 1);
	rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
	}

	static void as3722_reg_to_time(u8 rbuff, struct rtc_time tm)
	{
	tm->tm_sec = bcd2bin(rbuff[0] & 0x7F);
	tm->tm_min = bcd2bin(rbuff[1] & 0x7F);
	tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);
	tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);
	tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1;
	tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
	return;
	}

	static int as3722_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
	6, as_time_array);
	if (ret < 0) {
	dev_err(dev, "RTC_SECOND reg block read failed %d\n", ret);
	return ret;
	}
	as3722_reg_to_time(as_time_array, tm);
	return 0;
	}

	static int as3722_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900))
	return -EINVAL;

	as3722_time_to_reg(as_time_array, tm);
	ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
	as_time_array);
	if (ret < 0)
	dev_err(dev, "RTC_SECOND reg block write failed %d\n", ret);
	return ret;
	}

	static int as3722_rtc_alarm_irq_enable(struct device *dev,
	unsigned int enabled)
	{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

	if (enabled && !as3722_rtc->irq_enable) {
	enable_irq(as3722_rtc->alarm_irq);
	as3722_rtc->irq_enable = true;
	} else if (!enabled && as3722_rtc->irq_enable) {
	disable_irq(as3722_rtc->alarm_irq);
	as3722_rtc->irq_enable = false;
	}
	return 0;
	}

	static int as3722_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	ret = as3722_block_read(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
	as_time_array);
	if (ret < 0) {
	dev_err(dev, "RTC_ALARM_SECOND block read failed %d\n", ret);
	return ret;
	}

	as3722_reg_to_time(as_time_array, &alrm->time);
	return 0;
	}

	static int as3722_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	if (alrm->time.tm_year < (AS3722_RTC_START_YEAR - 1900))
	return -EINVAL;

	ret = as3722_rtc_alarm_irq_enable(dev, 0);
	if (ret < 0) {
	dev_err(dev, "Disable RTC alarm failed\n");
	return ret;
	}

	as3722_time_to_reg(as_time_array, &alrm->time);
	ret = as3722_block_write(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
	as_time_array);
	if (ret < 0) {
	dev_err(dev, "RTC_ALARM_SECOND block write failed %d\n", ret);
	return ret;
	}

	if (alrm->enabled)
	ret = as3722_rtc_alarm_irq_enable(dev, alrm->enabled);
	return ret;
	}

	static irqreturn_t as3722_alarm_irq(int irq, void *data)
	{
	struct as3722_rtc *as3722_rtc = data;

	rtc_update_irq(as3722_rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	return IRQ_HANDLED;
	}

	static const struct rtc_class_ops as3722_rtc_ops = {
	.read_time = as3722_rtc_read_time,
	.set_time = as3722_rtc_set_time,
	.read_alarm = as3722_rtc_read_alarm,
	.set_alarm = as3722_rtc_set_alarm,
	.alarm_irq_enable = as3722_rtc_alarm_irq_enable,
	};

	static int as3722_rtc_probe(struct platform_device *pdev)
	{
	struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
	struct as3722_rtc *as3722_rtc;
	int ret;

	as3722_rtc = devm_kzalloc(&pdev->dev, sizeof(*as3722_rtc), GFP_KERNEL);
	if (!as3722_rtc)
	return -ENOMEM;

	as3722_rtc->as3722 = as3722;
	as3722_rtc->dev = &pdev->dev;
	platform_set_drvdata(pdev, as3722_rtc);

	/* Enable the RTC to make sure it is running. */
	ret = as3722_update_bits(as3722, AS3722_RTC_CONTROL_REG,
	AS3722_RTC_ON \| AS3722_RTC_ALARM_WAKEUP_EN,
	AS3722_RTC_ON \| AS3722_RTC_ALARM_WAKEUP_EN);
	if (ret < 0) {
	dev_err(&pdev->dev, "RTC_CONTROL reg write failed: %d\n", ret);
	return ret;
	}

	device_init_wakeup(&pdev->dev, 1);

	as3722_rtc->rtc = devm_rtc_device_register(&pdev->dev, "as3722-rtc",
	&as3722_rtc_ops, THIS_MODULE);
	if (IS_ERR(as3722_rtc->rtc)) {
	ret = PTR_ERR(as3722_rtc->rtc);
	dev_err(&pdev->dev, "RTC register failed: %d\n", ret);
	return ret;
	}

	as3722_rtc->alarm_irq = platform_get_irq(pdev, 0);
	dev_info(&pdev->dev, "RTC interrupt %d\n", as3722_rtc->alarm_irq);

	ret = devm_request_threaded_irq(&pdev->dev, as3722_rtc->alarm_irq, NULL,
	as3722_alarm_irq, IRQF_ONESHOT,
	"rtc-alarm", as3722_rtc);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
	as3722_rtc->alarm_irq, ret);
	return ret;
	}
	disable_irq(as3722_rtc->alarm_irq);
	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int as3722_rtc_suspend(struct device *dev)
	{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
	enable_irq_wake(as3722_rtc->alarm_irq);

	return 0;
	}

	static int as3722_rtc_resume(struct device *dev)
	{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
	disable_irq_wake(as3722_rtc->alarm_irq);
	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend,
	as3722_rtc_resume);

	static struct platform_driver as3722_rtc_driver = {
	.probe = as3722_rtc_probe,
	.driver = {
	.name = "as3722-rtc",
	.pm = &as3722_rtc_pm_ops,
	},
	};
	module_platform_driver(as3722_rtc_driver);

	MODULE_DESCRIPTION("RTC driver for AS3722 PMICs");
	MODULE_ALIAS("platform:as3722-rtc");
	MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	MODULE_LICENSE("GPL");