linux-imx

/*

 * Motorola CPCAP PMIC RTC driver

 *

 * Based on cpcap-regulator.c from Motorola Linux kernel tree

 * Copyright (C) 2009 Motorola, Inc.

 *

 * Rewritten for mainline kernel

 *  - use DT

 *  - use regmap

 *  - use standard interrupt framework

 *  - use managed device resources

 *  - remove custom "secure clock daemon" helpers

 *

 * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>

 *

 * 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.

 *

 * 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/kernel.h>

#include <linux/module.h>

#include <linux/mod_devicetable.h>

#include <linux/init.h>

#include <linux/device.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>

#include <linux/err.h>

#include <linux/regmap.h>

#include <linux/mfd/motorola-cpcap.h>

#include <linux/slab.h>

#include <linux/sched.h>

​

#define SECS_PER_DAY 86400

#define DAY_MASK  0x7FFF

#define TOD1_MASK 0x00FF

#define TOD2_MASK 0x01FF

​

struct cpcap_time {

    int day;

    int tod1;

    int tod2;

};

​

struct cpcap_rtc {

    struct regmap *regmap;

    struct rtc_device *rtc_dev;

    u16 vendor;

    int alarm_irq;

    bool alarm_enabled;

    int update_irq;

    bool update_enabled;

};

​

static void cpcap2rtc_time(struct rtc_time *rtc, struct cpcap_time *cpcap)

{

    unsigned long int tod;

    unsigned long int time;

​

    tod = (cpcap->tod1 & TOD1_MASK) | ((cpcap->tod2 & TOD2_MASK) << 8);

    time = tod + ((cpcap->day & DAY_MASK) * SECS_PER_DAY);

​

    rtc_time_to_tm(time, rtc);

}

​

static void rtc2cpcap_time(struct cpcap_time *cpcap, struct rtc_time *rtc)

{

    unsigned long time;

​

    rtc_tm_to_time(rtc, &time);

​

    cpcap->day = time / SECS_PER_DAY;

    time %= SECS_PER_DAY;

    cpcap->tod2 = (time >> 8) & TOD2_MASK;

    cpcap->tod1 = time & TOD1_MASK;

}

​

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

{

    struct cpcap_rtc *rtc = dev_get_drvdata(dev);

​

    if (rtc->alarm_enabled == enabled)

        return 0;

​

    if (enabled)

        enable_irq(rtc->alarm_irq);

    else

        disable_irq(rtc->alarm_irq);