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Commit a39069f6 authored by Haojian Zhuang's avatar Haojian Zhuang Committed by Samuel Ortiz
Browse files

rtc: Enable rtc in max8925 



MAX8925 is a PMIC that contains RTC component.

Signed-off-by: default avatarHaojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 1f1cf8f9

drivers/rtc/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -175,6 +175,16 @@ config RTC_DRV_MAX6900 
	  This driver can also be built as a module. If so, the module

	  will be called rtc-max6900.



config RTC_DRV_MAX8925

	tristate "Maxim MAX8925"

	depends on MFD_MAX8925

	help

	  If you say yes here you will get support for the

	  RTC of Maxim MAX8925 PMIC.



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

	  will be called rtc-max8925.



config RTC_DRV_RS5C372

	tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"

	help

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ obj-$(CONFIG_RTC_DRV_M48T59) += rtc-m48t59.o 
obj-$(CONFIG_RTC_DRV_M48T86)	+= rtc-m48t86.o

obj-$(CONFIG_RTC_MXC)		+= rtc-mxc.o

obj-$(CONFIG_RTC_DRV_MAX6900)	+= rtc-max6900.o

obj-$(CONFIG_RTC_DRV_MAX8925)	+= rtc-max8925.o

obj-$(CONFIG_RTC_DRV_MAX6902)	+= rtc-max6902.o

obj-$(CONFIG_RTC_DRV_MC13783)	+= rtc-mc13783.o

obj-$(CONFIG_RTC_DRV_MSM6242)	+= rtc-msm6242.o

drivers/rtc/rtc-max8925.c

0 → 100644
+314 −0
Original line number Diff line number Diff line 
/*

 * 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/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;

	}



	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;

	}



	dev_set_drvdata(&pdev->dev, info);

	platform_set_drvdata(pdev, info);



	return 0;

out_rtc:

	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),

};



static int __init max8925_rtc_init(void)

{

	return platform_driver_register(&max8925_rtc_driver);

}

module_init(max8925_rtc_init);



static void __exit max8925_rtc_exit(void)

{

	platform_driver_unregister(&max8925_rtc_driver);

}

module_exit(max8925_rtc_exit);



MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");

MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");

MODULE_LICENSE("GPL");