linux-imx

/*

 * 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/of.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);