drivers/rtc/rtc-max8925.c - kernel/msm-4.9 - Gitiles

 /*
  * RTC driver for Maxim MAX8925
  *
  * Copyright (C) 2009-2010 Marvell International Ltd.
  *	Haojian Zhuang <haojian.zhuang@marvell.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/rtc.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/max8925.h>

 enum {
 	RTC_SEC = 0,
 	RTC_MIN,
 	RTC_HOUR,
 	RTC_WEEKDAY,
 	RTC_DATE,
 	RTC_MONTH,
 	RTC_YEAR1,
 	RTC_YEAR2,
 };

 #define MAX8925_RTC_SEC			0x00
 #define MAX8925_RTC_MIN			0x01
 #define MAX8925_RTC_HOUR		0x02
 #define MAX8925_RTC_WEEKDAY		0x03
 #define MAX8925_RTC_DATE		0x04
 #define MAX8925_RTC_MONTH		0x05
 #define MAX8925_RTC_YEAR1		0x06
 #define MAX8925_RTC_YEAR2		0x07
 #define MAX8925_ALARM0_SEC		0x08
 #define MAX8925_ALARM0_MIN		0x09
 #define MAX8925_ALARM0_HOUR		0x0a
 #define MAX8925_ALARM0_WEEKDAY		0x0b
 #define MAX8925_ALARM0_DATE		0x0c
 #define MAX8925_ALARM0_MON		0x0d
 #define MAX8925_ALARM0_YEAR1		0x0e
 #define MAX8925_ALARM0_YEAR2		0x0f
 #define MAX8925_ALARM1_SEC		0x10
 #define MAX8925_ALARM1_MIN		0x11
 #define MAX8925_ALARM1_HOUR		0x12
 #define MAX8925_ALARM1_WEEKDAY		0x13
 #define MAX8925_ALARM1_DATE		0x14
 #define MAX8925_ALARM1_MON		0x15
 #define MAX8925_ALARM1_YEAR1		0x16
 #define MAX8925_ALARM1_YEAR2		0x17
 #define MAX8925_RTC_CNTL		0x1b
 #define MAX8925_RTC_STATUS		0x20

 #define TIME_NUM			8
 #define ALARM_1SEC			(1 << 7)
 #define HOUR_12				(1 << 7)
 #define HOUR_AM_PM			(1 << 5)
 #define ALARM0_IRQ			(1 << 3)
 #define ALARM1_IRQ			(1 << 2)
 #define ALARM0_STATUS			(1 << 2)
 #define ALARM1_STATUS			(1 << 1)


 struct max8925_rtc_info {
 	struct rtc_device	*rtc_dev;
 	struct max8925_chip	*chip;
 	struct i2c_client	*rtc;
 	struct device		*dev;
 };

 static irqreturn_t rtc_update_handler(int irq, void *data)
 {
 	struct max8925_rtc_info *info = (struct max8925_rtc_info *)data;

 	/* disable ALARM0 except for 1SEC alarm */
 	max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0);
 	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 	return IRQ_HANDLED;
 }

 static int tm_calc(struct rtc_time *tm, unsigned char *buf, int len)
 {
 	if (len < TIME_NUM)
 		return -EINVAL;
 	tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000
 			+ (buf[RTC_YEAR2] & 0xf) * 100
 			+ (buf[RTC_YEAR1] >> 4) * 10
 			+ (buf[RTC_YEAR1] & 0xf);
 	tm->tm_year -= 1900;
 	tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10
 			+ (buf[RTC_MONTH] & 0x0f);
 	tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10
 			+ (buf[RTC_DATE] & 0x0f);
 	tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;
 	if (buf[RTC_HOUR] & HOUR_12) {
 		tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10
 				+ (buf[RTC_HOUR] & 0x0f);
 		if (buf[RTC_HOUR] & HOUR_AM_PM)
 			tm->tm_hour += 12;
 	} else
 		tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10
 				+ (buf[RTC_HOUR] & 0x0f);
 	tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10
 			+ (buf[RTC_MIN] & 0x0f);
 	tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10
 			+ (buf[RTC_SEC] & 0x0f);
 	return 0;
 }

 static int data_calc(unsigned char *buf, struct rtc_time *tm, int len)
 {
 	unsigned char high, low;

 	if (len < TIME_NUM)
 		return -EINVAL;

 	high = (tm->tm_year + 1900) / 1000;
 	low = (tm->tm_year + 1900) / 100;
 	low = low - high * 10;
 	buf[RTC_YEAR2] = (high << 4) + low;
 	high = (tm->tm_year + 1900) / 10;
 	low = tm->tm_year + 1900;
 	low = low - high * 10;
 	high = high - (high / 10) * 10;
 	buf[RTC_YEAR1] = (high << 4) + low;
 	high = tm->tm_mon / 10;
 	low = tm->tm_mon;
 	low = low - high * 10;
 	buf[RTC_MONTH] = (high << 4) + low;
 	high = tm->tm_mday / 10;
 	low = tm->tm_mday;
 	low = low - high * 10;
 	buf[RTC_DATE] = (high << 4) + low;
 	buf[RTC_WEEKDAY] = tm->tm_wday;
 	high = tm->tm_hour / 10;
 	low = tm->tm_hour;
 	low = low - high * 10;
 	buf[RTC_HOUR] = (high << 4) + low;
 	high = tm->tm_min / 10;
 	low = tm->tm_min;
 	low = low - high * 10;
 	buf[RTC_MIN] = (high << 4) + low;
 	high = tm->tm_sec / 10;
 	low = tm->tm_sec;
 	low = low - high * 10;
 	buf[RTC_SEC] = (high << 4) + low;
 	return 0;
 }

 static int max8925_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct max8925_rtc_info *info = dev_get_drvdata(dev);
 	unsigned char buf[TIME_NUM];
 	int ret;

 	ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
 	if (ret < 0)
 		goto out;
 	ret = tm_calc(tm, buf, TIME_NUM);
 out:
 	return ret;
 }

 static int max8925_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct max8925_rtc_info *info = dev_get_drvdata(dev);
 	unsigned char buf[TIME_NUM];
 	int ret;

 	ret = data_calc(buf, tm, TIME_NUM);
 	if (ret < 0)
 		goto out;
 	ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
 out:
 	return ret;
 }

 static int max8925_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct max8925_rtc_info *info = dev_get_drvdata(dev);
 	unsigned char buf[TIME_NUM];
 	int ret;

 	ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
 	if (ret < 0)
 		goto out;
 	ret = tm_calc(&alrm->time, buf, TIME_NUM);
 	if (ret < 0)
 		goto out;
 	ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK);
 	if (ret < 0)
 		goto out;
 	if ((ret & ALARM0_IRQ) == 0)
 		alrm->enabled = 1;
 	else
 		alrm->enabled = 0;
 	ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);
 	if (ret < 0)
 		goto out;
 	if (ret & ALARM0_STATUS)
 		alrm->pending = 1;
 	else
 		alrm->pending = 0;
 out:
 	return ret;
 }

 static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct max8925_rtc_info *info = dev_get_drvdata(dev);
 	unsigned char buf[TIME_NUM];
 	int ret;

 	ret = data_calc(buf, &alrm->time, TIME_NUM);
 	if (ret < 0)
 		goto out;
 	ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
 	if (ret < 0)
 		goto out;
 	/* only enable alarm on year/month/day/hour/min/sec */
 	ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
 	if (ret < 0)
 		goto out;
 out:
 	return ret;
 }

 static const struct rtc_class_ops max8925_rtc_ops = {
 	.read_time	= max8925_rtc_read_time,
 	.set_time	= max8925_rtc_set_time,
 	.read_alarm	= max8925_rtc_read_alarm,
 	.set_alarm	= max8925_rtc_set_alarm,
 };

 static int __devinit max8925_rtc_probe(struct platform_device *pdev)
 {
 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 	struct max8925_rtc_info *info;
 	int irq, ret;

 	info = kzalloc(sizeof(struct max8925_rtc_info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 	info->chip = chip;
 	info->rtc = chip->rtc;
 	info->dev = &pdev->dev;
 	irq = chip->irq_base + MAX8925_IRQ_RTC_ALARM0;

 	ret = request_threaded_irq(irq, NULL, rtc_update_handler,
 				   IRQF_ONESHOT, "rtc-alarm0", info);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 			irq, ret);
 		goto out_irq;
 	}

 	dev_set_drvdata(&pdev->dev, info);
 	/* XXX - isn't this redundant? */
 	platform_set_drvdata(pdev, info);

 	info->rtc_dev = rtc_device_register("max8925-rtc", &pdev->dev,
 					&max8925_rtc_ops, THIS_MODULE);
 	ret = PTR_ERR(info->rtc_dev);
 	if (IS_ERR(info->rtc_dev)) {
 		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
 		goto out_rtc;
 	}

 	return 0;
 out_rtc:
 	platform_set_drvdata(pdev, NULL);
 	free_irq(chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
 out_irq:
 	kfree(info);
 	return ret;
 }

 static int __devexit max8925_rtc_remove(struct platform_device *pdev)
 {
 	struct max8925_rtc_info *info = platform_get_drvdata(pdev);

 	if (info) {
 		free_irq(info->chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
 		rtc_device_unregister(info->rtc_dev);
 		kfree(info);
 	}
 	return 0;
 }

 static struct platform_driver max8925_rtc_driver = {
 	.driver		= {
 		.name	= "max8925-rtc",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= max8925_rtc_probe,
 	.remove		= __devexit_p(max8925_rtc_remove),
 };

 module_platform_driver(max8925_rtc_driver);

 MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");
 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 MODULE_LICENSE("GPL");
	/*
	* RTC driver for Maxim MAX8925
	*
	* Copyright (C) 2009-2010 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@marvell.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/module.h>
	#include <linux/i2c.h>
	#include <linux/slab.h>
	#include <linux/rtc.h>
	#include <linux/platform_device.h>
	#include <linux/mfd/max8925.h>

	enum {
	RTC_SEC = 0,
	RTC_MIN,
	RTC_HOUR,
	RTC_WEEKDAY,
	RTC_DATE,
	RTC_MONTH,
	RTC_YEAR1,
	RTC_YEAR2,
	};

	#define MAX8925_RTC_SEC 0x00
	#define MAX8925_RTC_MIN 0x01
	#define MAX8925_RTC_HOUR 0x02
	#define MAX8925_RTC_WEEKDAY 0x03
	#define MAX8925_RTC_DATE 0x04
	#define MAX8925_RTC_MONTH 0x05
	#define MAX8925_RTC_YEAR1 0x06
	#define MAX8925_RTC_YEAR2 0x07
	#define MAX8925_ALARM0_SEC 0x08
	#define MAX8925_ALARM0_MIN 0x09
	#define MAX8925_ALARM0_HOUR 0x0a
	#define MAX8925_ALARM0_WEEKDAY 0x0b
	#define MAX8925_ALARM0_DATE 0x0c
	#define MAX8925_ALARM0_MON 0x0d
	#define MAX8925_ALARM0_YEAR1 0x0e
	#define MAX8925_ALARM0_YEAR2 0x0f
	#define MAX8925_ALARM1_SEC 0x10
	#define MAX8925_ALARM1_MIN 0x11
	#define MAX8925_ALARM1_HOUR 0x12
	#define MAX8925_ALARM1_WEEKDAY 0x13
	#define MAX8925_ALARM1_DATE 0x14
	#define MAX8925_ALARM1_MON 0x15
	#define MAX8925_ALARM1_YEAR1 0x16
	#define MAX8925_ALARM1_YEAR2 0x17
	#define MAX8925_RTC_CNTL 0x1b
	#define MAX8925_RTC_STATUS 0x20

	#define TIME_NUM 8
	#define ALARM_1SEC (1 << 7)
	#define HOUR_12 (1 << 7)
	#define HOUR_AM_PM (1 << 5)
	#define ALARM0_IRQ (1 << 3)
	#define ALARM1_IRQ (1 << 2)
	#define ALARM0_STATUS (1 << 2)
	#define ALARM1_STATUS (1 << 1)


	struct max8925_rtc_info {
	struct rtc_device *rtc_dev;
	struct max8925_chip *chip;
	struct i2c_client *rtc;
	struct device *dev;
	};

	static irqreturn_t rtc_update_handler(int irq, void *data)
	{
	struct max8925_rtc_info info = (struct max8925_rtc_info )data;

	/* disable ALARM0 except for 1SEC alarm */
	max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0);
	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF \| RTC_AF);
	return IRQ_HANDLED;
	}

	static int tm_calc(struct rtc_time tm, unsigned char buf, int len)
	{
	if (len < TIME_NUM)
	return -EINVAL;
	tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000
	+ (buf[RTC_YEAR2] & 0xf) * 100
	+ (buf[RTC_YEAR1] >> 4) * 10
	+ (buf[RTC_YEAR1] & 0xf);
	tm->tm_year -= 1900;
	tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10
	+ (buf[RTC_MONTH] & 0x0f);
	tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10
	+ (buf[RTC_DATE] & 0x0f);
	tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;
	if (buf[RTC_HOUR] & HOUR_12) {
	tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10
	+ (buf[RTC_HOUR] & 0x0f);
	if (buf[RTC_HOUR] & HOUR_AM_PM)
	tm->tm_hour += 12;
	} else
	tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10
	+ (buf[RTC_HOUR] & 0x0f);
	tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10
	+ (buf[RTC_MIN] & 0x0f);
	tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10
	+ (buf[RTC_SEC] & 0x0f);
	return 0;
	}

	static int data_calc(unsigned char buf, struct rtc_time tm, int len)
	{
	unsigned char high, low;

	if (len < TIME_NUM)
	return -EINVAL;

	high = (tm->tm_year + 1900) / 1000;
	low = (tm->tm_year + 1900) / 100;
	low = low - high * 10;
	buf[RTC_YEAR2] = (high << 4) + low;
	high = (tm->tm_year + 1900) / 10;
	low = tm->tm_year + 1900;
	low = low - high * 10;
	high = high - (high / 10) * 10;
	buf[RTC_YEAR1] = (high << 4) + low;
	high = tm->tm_mon / 10;
	low = tm->tm_mon;
	low = low - high * 10;
	buf[RTC_MONTH] = (high << 4) + low;
	high = tm->tm_mday / 10;
	low = tm->tm_mday;
	low = low - high * 10;
	buf[RTC_DATE] = (high << 4) + low;
	buf[RTC_WEEKDAY] = tm->tm_wday;
	high = tm->tm_hour / 10;
	low = tm->tm_hour;
	low = low - high * 10;
	buf[RTC_HOUR] = (high << 4) + low;
	high = tm->tm_min / 10;
	low = tm->tm_min;
	low = low - high * 10;
	buf[RTC_MIN] = (high << 4) + low;
	high = tm->tm_sec / 10;
	low = tm->tm_sec;
	low = low - high * 10;
	buf[RTC_SEC] = (high << 4) + low;
	return 0;
	}

	static int max8925_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[TIME_NUM];
	int ret;

	ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
	if (ret < 0)
	goto out;
	ret = tm_calc(tm, buf, TIME_NUM);
	out:
	return ret;
	}

	static int max8925_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[TIME_NUM];
	int ret;

	ret = data_calc(buf, tm, TIME_NUM);
	if (ret < 0)
	goto out;
	ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
	out:
	return ret;
	}

	static int max8925_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[TIME_NUM];
	int ret;

	ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
	if (ret < 0)
	goto out;
	ret = tm_calc(&alrm->time, buf, TIME_NUM);
	if (ret < 0)
	goto out;
	ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK);
	if (ret < 0)
	goto out;
	if ((ret & ALARM0_IRQ) == 0)
	alrm->enabled = 1;
	else
	alrm->enabled = 0;
	ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);
	if (ret < 0)
	goto out;
	if (ret & ALARM0_STATUS)
	alrm->pending = 1;
	else
	alrm->pending = 0;
	out:
	return ret;
	}

	static int max8925_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[TIME_NUM];
	int ret;

	ret = data_calc(buf, &alrm->time, TIME_NUM);
	if (ret < 0)
	goto out;
	ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
	if (ret < 0)
	goto out;
	/* only enable alarm on year/month/day/hour/min/sec */
	ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
	if (ret < 0)
	goto out;
	out:
	return ret;
	}

	static const struct rtc_class_ops max8925_rtc_ops = {
	.read_time = max8925_rtc_read_time,
	.set_time = max8925_rtc_set_time,
	.read_alarm = max8925_rtc_read_alarm,
	.set_alarm = max8925_rtc_set_alarm,
	};

	static int __devinit max8925_rtc_probe(struct platform_device *pdev)
	{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_rtc_info *info;
	int irq, ret;

	info = kzalloc(sizeof(struct max8925_rtc_info), GFP_KERNEL);
	if (!info)
	return -ENOMEM;
	info->chip = chip;
	info->rtc = chip->rtc;
	info->dev = &pdev->dev;
	irq = chip->irq_base + MAX8925_IRQ_RTC_ALARM0;

	ret = request_threaded_irq(irq, NULL, rtc_update_handler,
	IRQF_ONESHOT, "rtc-alarm0", info);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
	irq, ret);
	goto out_irq;
	}

	dev_set_drvdata(&pdev->dev, info);
	/* XXX - isn't this redundant? */
	platform_set_drvdata(pdev, info);

	info->rtc_dev = rtc_device_register("max8925-rtc", &pdev->dev,
	&max8925_rtc_ops, THIS_MODULE);
	ret = PTR_ERR(info->rtc_dev);
	if (IS_ERR(info->rtc_dev)) {
	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
	goto out_rtc;
	}

	return 0;
	out_rtc:
	platform_set_drvdata(pdev, NULL);
	free_irq(chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
	out_irq:
	kfree(info);
	return ret;
	}

	static int __devexit max8925_rtc_remove(struct platform_device *pdev)
	{
	struct max8925_rtc_info *info = platform_get_drvdata(pdev);

	if (info) {
	free_irq(info->chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
	rtc_device_unregister(info->rtc_dev);
	kfree(info);
	}
	return 0;
	}

	static struct platform_driver max8925_rtc_driver = {
	.driver = {
	.name = "max8925-rtc",
	.owner = THIS_MODULE,
	},
	.probe = max8925_rtc_probe,
	.remove = __devexit_p(max8925_rtc_remove),
	};

	module_platform_driver(max8925_rtc_driver);

	MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");
	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	MODULE_LICENSE("GPL");