/*

   * rtc-twl.c -- TWL Real Time Clock interface

   *
   * Copyright (C) 2007 MontaVista Software, Inc
   * Author: Alexandre Rusev <source@mvista.com>
   *
   * Based on original TI driver twl4030-rtc.c
   *   Copyright (C) 2006 Texas Instruments, Inc.
   *
   * Based on rtc-omap.c
   *   Copyright (C) 2003 MontaVista Software, Inc.
   *   Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
   *   Copyright (C) 2006 David Brownell
   *
   * 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.
   */

  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/kernel.h>

  #include <linux/errno.h>

  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/types.h>
  #include <linux/rtc.h>
  #include <linux/bcd.h>
  #include <linux/platform_device.h>
  #include <linux/interrupt.h>

  #include <linux/of.h>

  #include <linux/mfd/twl.h>

  enum twl_class {
  	TWL_4030 = 0,
  	TWL_6030,
  };

  
  /*
   * RTC block register offsets (use TWL_MODULE_RTC)
   */

  enum {
  	REG_SECONDS_REG = 0,
  	REG_MINUTES_REG,
  	REG_HOURS_REG,
  	REG_DAYS_REG,
  	REG_MONTHS_REG,
  	REG_YEARS_REG,
  	REG_WEEKS_REG,
  
  	REG_ALARM_SECONDS_REG,
  	REG_ALARM_MINUTES_REG,
  	REG_ALARM_HOURS_REG,
  	REG_ALARM_DAYS_REG,
  	REG_ALARM_MONTHS_REG,
  	REG_ALARM_YEARS_REG,
  
  	REG_RTC_CTRL_REG,
  	REG_RTC_STATUS_REG,
  	REG_RTC_INTERRUPTS_REG,
  
  	REG_RTC_COMP_LSB_REG,
  	REG_RTC_COMP_MSB_REG,
  };

  static const u8 twl4030_rtc_reg_map[] = {

  	[REG_SECONDS_REG] = 0x00,
  	[REG_MINUTES_REG] = 0x01,
  	[REG_HOURS_REG] = 0x02,
  	[REG_DAYS_REG] = 0x03,
  	[REG_MONTHS_REG] = 0x04,
  	[REG_YEARS_REG] = 0x05,
  	[REG_WEEKS_REG] = 0x06,
  
  	[REG_ALARM_SECONDS_REG] = 0x07,
  	[REG_ALARM_MINUTES_REG] = 0x08,
  	[REG_ALARM_HOURS_REG] = 0x09,
  	[REG_ALARM_DAYS_REG] = 0x0A,
  	[REG_ALARM_MONTHS_REG] = 0x0B,
  	[REG_ALARM_YEARS_REG] = 0x0C,
  
  	[REG_RTC_CTRL_REG] = 0x0D,
  	[REG_RTC_STATUS_REG] = 0x0E,
  	[REG_RTC_INTERRUPTS_REG] = 0x0F,
  
  	[REG_RTC_COMP_LSB_REG] = 0x10,
  	[REG_RTC_COMP_MSB_REG] = 0x11,
  };

  static const u8 twl6030_rtc_reg_map[] = {

  	[REG_SECONDS_REG] = 0x00,
  	[REG_MINUTES_REG] = 0x01,
  	[REG_HOURS_REG] = 0x02,
  	[REG_DAYS_REG] = 0x03,
  	[REG_MONTHS_REG] = 0x04,
  	[REG_YEARS_REG] = 0x05,
  	[REG_WEEKS_REG] = 0x06,
  
  	[REG_ALARM_SECONDS_REG] = 0x08,
  	[REG_ALARM_MINUTES_REG] = 0x09,
  	[REG_ALARM_HOURS_REG] = 0x0A,
  	[REG_ALARM_DAYS_REG] = 0x0B,
  	[REG_ALARM_MONTHS_REG] = 0x0C,
  	[REG_ALARM_YEARS_REG] = 0x0D,
  
  	[REG_RTC_CTRL_REG] = 0x10,
  	[REG_RTC_STATUS_REG] = 0x11,
  	[REG_RTC_INTERRUPTS_REG] = 0x12,
  
  	[REG_RTC_COMP_LSB_REG] = 0x13,
  	[REG_RTC_COMP_MSB_REG] = 0x14,
  };

  
  /* RTC_CTRL_REG bitfields */
  #define BIT_RTC_CTRL_REG_STOP_RTC_M              0x01
  #define BIT_RTC_CTRL_REG_ROUND_30S_M             0x02
  #define BIT_RTC_CTRL_REG_AUTO_COMP_M             0x04
  #define BIT_RTC_CTRL_REG_MODE_12_24_M            0x08
  #define BIT_RTC_CTRL_REG_TEST_MODE_M             0x10
  #define BIT_RTC_CTRL_REG_SET_32_COUNTER_M        0x20
  #define BIT_RTC_CTRL_REG_GET_TIME_M              0x40

  #define BIT_RTC_CTRL_REG_RTC_V_OPT               0x80

  
  /* RTC_STATUS_REG bitfields */
  #define BIT_RTC_STATUS_REG_RUN_M                 0x02
  #define BIT_RTC_STATUS_REG_1S_EVENT_M            0x04
  #define BIT_RTC_STATUS_REG_1M_EVENT_M            0x08
  #define BIT_RTC_STATUS_REG_1H_EVENT_M            0x10
  #define BIT_RTC_STATUS_REG_1D_EVENT_M            0x20
  #define BIT_RTC_STATUS_REG_ALARM_M               0x40
  #define BIT_RTC_STATUS_REG_POWER_UP_M            0x80
  
  /* RTC_INTERRUPTS_REG bitfields */
  #define BIT_RTC_INTERRUPTS_REG_EVERY_M           0x03
  #define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M        0x04
  #define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M        0x08
  
  
  /* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
  #define ALL_TIME_REGS		6
  
  /*----------------------------------------------------------------------*/

  struct twl_rtc {
  	struct device *dev;
  	struct rtc_device *rtc;
  	u8 *reg_map;
  	/*
  	 * Cache the value for timer/alarm interrupts register; this is
  	 * only changed by callers holding rtc ops lock (or resume).
  	 */
  	unsigned char rtc_irq_bits;
  	bool wake_enabled;
  #ifdef CONFIG_PM_SLEEP
  	unsigned char irqstat;
  #endif
  	enum twl_class class;
  };

  
  /*

   * Supports 1 byte read from TWL RTC register.

   */

  static int twl_rtc_read_u8(struct twl_rtc *twl_rtc, u8 *data, u8 reg)

  {
  	int ret;

  	ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (twl_rtc->reg_map[reg]));

  	if (ret < 0)

  		pr_err("Could not read TWL register %X - error %d
  ", reg, ret);

  	return ret;
  }
  
  /*

   * Supports 1 byte write to TWL RTC registers.

   */

  static int twl_rtc_write_u8(struct twl_rtc *twl_rtc, u8 data, u8 reg)

  {
  	int ret;

  	ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (twl_rtc->reg_map[reg]));

  	if (ret < 0)

  		pr_err("Could not write TWL register %X - error %d
  ",
  		       reg, ret);

  	return ret;
  }
  
  /*

   * Enable 1/second update and/or alarm interrupts.

   */

  static int set_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit)

  {
  	unsigned char val;
  	int ret;

  	/* if the bit is set, return from here */

  	if (twl_rtc->rtc_irq_bits & bit)

  		return 0;

  	val = twl_rtc->rtc_irq_bits | bit;

  	val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;

  	ret = twl_rtc_write_u8(twl_rtc, val, REG_RTC_INTERRUPTS_REG);

  	if (ret == 0)

  		twl_rtc->rtc_irq_bits = val;

  
  	return ret;
  }
  
  /*

   * Disable update and/or alarm interrupts.

   */

  static int mask_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit)

  {
  	unsigned char val;
  	int ret;

  	/* if the bit is clear, return from here */

  	if (!(twl_rtc->rtc_irq_bits & bit))

  		return 0;

  	val = twl_rtc->rtc_irq_bits & ~bit;
  	ret = twl_rtc_write_u8(twl_rtc, val, REG_RTC_INTERRUPTS_REG);

  	if (ret == 0)

  		twl_rtc->rtc_irq_bits = val;

  
  	return ret;
  }

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

  {

  	struct platform_device *pdev = to_platform_device(dev);

  	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);

  	int irq = platform_get_irq(pdev, 0);

  	int ret;

  	if (enabled) {

  		ret = set_rtc_irq_bit(twl_rtc,
  				      BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
  		if (device_can_wakeup(dev) && !twl_rtc->wake_enabled) {

  			enable_irq_wake(irq);

  			twl_rtc->wake_enabled = true;

  		}
  	} else {

  		ret = mask_rtc_irq_bit(twl_rtc,
  				       BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
  		if (twl_rtc->wake_enabled) {

  			disable_irq_wake(irq);

  			twl_rtc->wake_enabled = false;

  		}
  	}

  
  	return ret;
  }

  /*

   * Gets current TWL RTC time and date parameters.

   *
   * The RTC's time/alarm representation is not what gmtime(3) requires
   * Linux to use:
   *
   *  - Months are 1..12 vs Linux 0-11
   *  - Years are 0..99 vs Linux 1900..N (we assume 21st century)
   */

  static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)

  {

  	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);

  	unsigned char rtc_data[ALL_TIME_REGS];

  	int ret;
  	u8 save_control;

  	u8 rtc_control;

  	ret = twl_rtc_read_u8(twl_rtc, &save_control, REG_RTC_CTRL_REG);

  	if (ret < 0) {
  		dev_err(dev, "%s: reading CTRL_REG, error %d
  ", __func__, ret);

  		return ret;

  	}
  	/* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */

  	if (twl_rtc->class == TWL_6030) {

  		if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
  			save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;

  			ret = twl_rtc_write_u8(twl_rtc, save_control,
  					       REG_RTC_CTRL_REG);

  			if (ret < 0) {
  				dev_err(dev, "%s clr GET_TIME, error %d
  ",
  					__func__, ret);
  				return ret;
  			}
  		}
  	}

  	/* Copy RTC counting registers to static registers or latches */
  	rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;

  	/* for twl6030/32 enable read access to static shadowed registers */

  	if (twl_rtc->class == TWL_6030)

  		rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;

  	ret = twl_rtc_write_u8(twl_rtc, rtc_control, REG_RTC_CTRL_REG);

  	if (ret < 0) {
  		dev_err(dev, "%s: writing CTRL_REG, error %d
  ", __func__, ret);

  		return ret;

  	}

  	ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,

  			(twl_rtc->reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);

  
  	if (ret < 0) {

  		dev_err(dev, "%s: reading data, error %d
  ", __func__, ret);

  		return ret;
  	}

  	/* for twl6030 restore original state of rtc control register */

  	if (twl_rtc->class == TWL_6030) {
  		ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);

  		if (ret < 0) {
  			dev_err(dev, "%s: restore CTRL_REG, error %d
  ",
  				__func__, ret);
  			return ret;
  		}
  	}

  	tm->tm_sec = bcd2bin(rtc_data[0]);
  	tm->tm_min = bcd2bin(rtc_data[1]);
  	tm->tm_hour = bcd2bin(rtc_data[2]);
  	tm->tm_mday = bcd2bin(rtc_data[3]);
  	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
  	tm->tm_year = bcd2bin(rtc_data[5]) + 100;
  
  	return ret;
  }

  static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)

  {

  	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);

  	unsigned char save_control;

  	unsigned char rtc_data[ALL_TIME_REGS];

  	int ret;

  	rtc_data[0] = bin2bcd(tm->tm_sec);
  	rtc_data[1] = bin2bcd(tm->tm_min);
  	rtc_data[2] = bin2bcd(tm->tm_hour);
  	rtc_data[3] = bin2bcd(tm->tm_mday);
  	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
  	rtc_data[5] = bin2bcd(tm->tm_year - 100);

  
  	/* Stop RTC while updating the TC registers */

  	ret = twl_rtc_read_u8(twl_rtc, &save_control, REG_RTC_CTRL_REG);

  	if (ret < 0)
  		goto out;
  
  	save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;

  	ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);

  	if (ret < 0)
  		goto out;
  
  	/* update all the time registers in one shot */

  	ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,

  		(twl_rtc->reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);

  	if (ret < 0) {
  		dev_err(dev, "rtc_set_time error %d
  ", ret);
  		goto out;
  	}
  
  	/* Start back RTC */
  	save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;

  	ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);

  
  out:
  	return ret;
  }
  
  /*

   * Gets current TWL RTC alarm time.

   */

  static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)

  {

  	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);

  	unsigned char rtc_data[ALL_TIME_REGS];

  	int ret;

  	ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,

  			twl_rtc->reg_map[REG_ALARM_SECONDS_REG], ALL_TIME_REGS);

  	if (ret < 0) {
  		dev_err(dev, "rtc_read_alarm error %d
  ", ret);
  		return ret;
  	}
  
  	/* some of these fields may be wildcard/"match all" */
  	alm->time.tm_sec = bcd2bin(rtc_data[0]);
  	alm->time.tm_min = bcd2bin(rtc_data[1]);
  	alm->time.tm_hour = bcd2bin(rtc_data[2]);
  	alm->time.tm_mday = bcd2bin(rtc_data[3]);
  	alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
  	alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
  
  	/* report cached alarm enable state */

  	if (twl_rtc->rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)

  		alm->enabled = 1;
  
  	return ret;
  }

  static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)

  {

  	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);

  	unsigned char alarm_data[ALL_TIME_REGS];

  	int ret;

  	ret = twl_rtc_alarm_irq_enable(dev, 0);

  	if (ret)
  		goto out;

  	alarm_data[0] = bin2bcd(alm->time.tm_sec);
  	alarm_data[1] = bin2bcd(alm->time.tm_min);
  	alarm_data[2] = bin2bcd(alm->time.tm_hour);
  	alarm_data[3] = bin2bcd(alm->time.tm_mday);
  	alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
  	alarm_data[5] = bin2bcd(alm->time.tm_year - 100);

  
  	/* update all the alarm registers in one shot */

  	ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,

  			twl_rtc->reg_map[REG_ALARM_SECONDS_REG], ALL_TIME_REGS);

  	if (ret) {
  		dev_err(dev, "rtc_set_alarm error %d
  ", ret);
  		goto out;
  	}
  
  	if (alm->enabled)

  		ret = twl_rtc_alarm_irq_enable(dev, 1);

  out:
  	return ret;
  }

  static irqreturn_t twl_rtc_interrupt(int irq, void *data)

  {

  	struct twl_rtc *twl_rtc = data;

  	unsigned long events;

  	int ret = IRQ_NONE;
  	int res;
  	u8 rd_reg;

  	res = twl_rtc_read_u8(twl_rtc, &rd_reg, REG_RTC_STATUS_REG);

  	if (res)
  		goto out;
  	/*
  	 * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
  	 * only one (ALARM or RTC) interrupt source may be enabled
  	 * at time, we also could check our results
  	 * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
  	 */
  	if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)

  		events = RTC_IRQF | RTC_AF;

  	else

  		events = RTC_IRQF | RTC_PF;

  	res = twl_rtc_write_u8(twl_rtc, BIT_RTC_STATUS_REG_ALARM_M,
  			       REG_RTC_STATUS_REG);

  	if (res)
  		goto out;

  	if (twl_rtc->class == TWL_4030) {

  		/* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
  		 * needs 2 reads to clear the interrupt. One read is done in
  		 * do_twl_pwrirq(). Doing the second read, to clear
  		 * the bit.
  		 *
  		 * FIXME the reason PWR_ISR1 needs an extra read is that
  		 * RTC_IF retriggered until we cleared REG_ALARM_M above.
  		 * But re-reading like this is a bad hack; by doing so we
  		 * risk wrongly clearing status for some other IRQ (losing
  		 * the interrupt).  Be smarter about handling RTC_UF ...
  		 */
  		res = twl_i2c_read_u8(TWL4030_MODULE_INT,

  			&rd_reg, TWL4030_INT_PWR_ISR1);

  		if (res)
  			goto out;
  	}

  
  	/* Notify RTC core on event */

  	rtc_update_irq(twl_rtc->rtc, 1, events);

  
  	ret = IRQ_HANDLED;
  out:
  	return ret;
  }

  static const struct rtc_class_ops twl_rtc_ops = {

  	.read_time	= twl_rtc_read_time,
  	.set_time	= twl_rtc_set_time,
  	.read_alarm	= twl_rtc_read_alarm,
  	.set_alarm	= twl_rtc_set_alarm,
  	.alarm_irq_enable = twl_rtc_alarm_irq_enable,

  };
  
  /*----------------------------------------------------------------------*/

  static int twl_rtc_probe(struct platform_device *pdev)

  {

  	struct twl_rtc *twl_rtc;

  	struct device_node *np = pdev->dev.of_node;

  	int ret = -EINVAL;

  	int irq = platform_get_irq(pdev, 0);
  	u8 rd_reg;

  	if (!np) {
  		dev_err(&pdev->dev, "no DT info
  ");
  		return -EINVAL;
  	}

  	if (irq <= 0)

  		return ret;

  	twl_rtc = devm_kzalloc(&pdev->dev, sizeof(*twl_rtc), GFP_KERNEL);
  	if (!twl_rtc)
  		return -ENOMEM;
  
  	if (twl_class_is_4030()) {
  		twl_rtc->class = TWL_4030;
  		twl_rtc->reg_map = (u8 *)twl4030_rtc_reg_map;
  	} else if (twl_class_is_6030()) {
  		twl_rtc->class = TWL_6030;
  		twl_rtc->reg_map = (u8 *)twl6030_rtc_reg_map;
  	} else {
  		dev_err(&pdev->dev, "TWL Class not supported.
  ");
  		return -EINVAL;
  	}

  	ret = twl_rtc_read_u8(twl_rtc, &rd_reg, REG_RTC_STATUS_REG);

  	if (ret < 0)

  		return ret;

  
  	if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
  		dev_warn(&pdev->dev, "Power up reset detected.
  ");
  
  	if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
  		dev_warn(&pdev->dev, "Pending Alarm interrupt detected.
  ");
  
  	/* Clear RTC Power up reset and pending alarm interrupts */

  	ret = twl_rtc_write_u8(twl_rtc, rd_reg, REG_RTC_STATUS_REG);

  	if (ret < 0)

  		return ret;

  	if (twl_rtc->class == TWL_6030) {

  		twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
  			REG_INT_MSK_LINE_A);
  		twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
  			REG_INT_MSK_STS_A);
  	}

  	dev_info(&pdev->dev, "Enabling TWL-RTC
  ");

  	ret = twl_rtc_write_u8(twl_rtc, BIT_RTC_CTRL_REG_STOP_RTC_M,
  			       REG_RTC_CTRL_REG);

  	if (ret < 0)

  		return ret;

  	/* ensure interrupts are disabled, bootloaders can be strange */

  	ret = twl_rtc_write_u8(twl_rtc, 0, REG_RTC_INTERRUPTS_REG);

  	if (ret < 0)
  		dev_warn(&pdev->dev, "unable to disable interrupt
  ");

  	/* init cached IRQ enable bits */

  	ret = twl_rtc_read_u8(twl_rtc, &twl_rtc->rtc_irq_bits,
  			      REG_RTC_INTERRUPTS_REG);

  	if (ret < 0)

  		return ret;

  	platform_set_drvdata(pdev, twl_rtc);

  	device_init_wakeup(&pdev->dev, 1);

  	twl_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,

  					&twl_rtc_ops, THIS_MODULE);

  	if (IS_ERR(twl_rtc->rtc)) {

  		dev_err(&pdev->dev, "can't register RTC device, err %ld
  ",

  			PTR_ERR(twl_rtc->rtc));
  		return PTR_ERR(twl_rtc->rtc);

  	}

  	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
  					twl_rtc_interrupt,
  					IRQF_TRIGGER_RISING | IRQF_ONESHOT,

  					dev_name(&twl_rtc->rtc->dev), twl_rtc);

  	if (ret < 0) {
  		dev_err(&pdev->dev, "IRQ is not free.
  ");

  		return ret;

  	}

  	return 0;

  }
  
  /*

   * Disable all TWL RTC module interrupts.

   * Sets status flag to free.
   */

  static int twl_rtc_remove(struct platform_device *pdev)

  {

  	struct twl_rtc *twl_rtc = platform_get_drvdata(pdev);

  	/* leave rtc running, but disable irqs */

  	mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
  	mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
  	if (twl_rtc->class == TWL_6030) {

  		twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
  			REG_INT_MSK_LINE_A);
  		twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
  			REG_INT_MSK_STS_A);
  	}

  	return 0;
  }

  static void twl_rtc_shutdown(struct platform_device *pdev)

  {

  	struct twl_rtc *twl_rtc = platform_get_drvdata(pdev);

  	/* mask timer interrupts, but leave alarm interrupts on to enable
  	   power-on when alarm is triggered */

  	mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);

  }

  #ifdef CONFIG_PM_SLEEP

  static int twl_rtc_suspend(struct device *dev)

  {

  	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);

  	twl_rtc->irqstat = twl_rtc->rtc_irq_bits;
  
  	mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);

  	return 0;
  }

  static int twl_rtc_resume(struct device *dev)

  {

  	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
  
  	set_rtc_irq_bit(twl_rtc, twl_rtc->irqstat);

  	return 0;
  }

  #endif

  static SIMPLE_DEV_PM_OPS(twl_rtc_pm_ops, twl_rtc_suspend, twl_rtc_resume);

  static const struct of_device_id twl_rtc_of_match[] = {
  	{.compatible = "ti,twl4030-rtc", },
  	{ },
  };
  MODULE_DEVICE_TABLE(of, twl_rtc_of_match);

  
  static struct platform_driver twl4030rtc_driver = {

  	.probe		= twl_rtc_probe,

  	.remove		= twl_rtc_remove,

  	.shutdown	= twl_rtc_shutdown,

  	.driver		= {

  		.name		= "twl_rtc",

  		.pm		= &twl_rtc_pm_ops,

  		.of_match_table = twl_rtc_of_match,

  	},
  };

  module_platform_driver(twl4030rtc_driver);

  
  MODULE_AUTHOR("Texas Instruments, MontaVista Software");
  MODULE_LICENSE("GPL");