linux-imx

/* rtc-ds1343.c

 *

 * Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible

 * Real Time Clock

 *

 * Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>

 *      Ankur Srivastava <sankurece@gmail.com> : DS1343 Nvram Support

 *

 * 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/init.h>

#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/device.h>

#include <linux/spi/spi.h>

#include <linux/regmap.h>

#include <linux/rtc.h>

#include <linux/bcd.h>

#include <linux/pm.h>

#include <linux/pm_wakeirq.h>

#include <linux/slab.h>

​

#define DALLAS_MAXIM_DS1343 0

#define DALLAS_MAXIM_DS1344 1

​

/* RTC DS1343 Registers */

#define DS1343_SECONDS_REG  0x00

#define DS1343_MINUTES_REG  0x01

#define DS1343_HOURS_REG    0x02

#define DS1343_DAY_REG      0x03

#define DS1343_DATE_REG     0x04

#define DS1343_MONTH_REG    0x05

#define DS1343_YEAR_REG     0x06

#define DS1343_ALM0_SEC_REG 0x07

#define DS1343_ALM0_MIN_REG 0x08

#define DS1343_ALM0_HOUR_REG    0x09

#define DS1343_ALM0_DAY_REG 0x0A

#define DS1343_ALM1_SEC_REG 0x0B

#define DS1343_ALM1_MIN_REG 0x0C

#define DS1343_ALM1_HOUR_REG    0x0D

#define DS1343_ALM1_DAY_REG 0x0E

#define DS1343_CONTROL_REG  0x0F

#define DS1343_STATUS_REG   0x10

#define DS1343_TRICKLE_REG  0x11

#define DS1343_NVRAM        0x20

​

#define DS1343_NVRAM_LEN    96

​

/* DS1343 Control Registers bits */

#define DS1343_EOSC     0x80

#define DS1343_DOSF     0x20

#define DS1343_EGFIL        0x10

#define DS1343_SQW      0x08

#define DS1343_INTCN        0x04

#define DS1343_A1IE     0x02

#define DS1343_A0IE     0x01

​

/* DS1343 Status Registers bits */

#define DS1343_OSF      0x80

#define DS1343_IRQF1        0x02

#define DS1343_IRQF0        0x01

​

/* DS1343 Trickle Charger Registers bits */

#define DS1343_TRICKLE_MAGIC    0xa0

#define DS1343_TRICKLE_DS1  0x08

#define DS1343_TRICKLE_1K   0x01

#define DS1343_TRICKLE_2K   0x02

#define DS1343_TRICKLE_4K   0x03

​

static const struct spi_device_id ds1343_id[] = {

    { "ds1343", DALLAS_MAXIM_DS1343 },

    { "ds1344", DALLAS_MAXIM_DS1344 },

    { }

};

MODULE_DEVICE_TABLE(spi, ds1343_id);

​

struct ds1343_priv {

    struct spi_device *spi;

    struct rtc_device *rtc;

    struct regmap *map;

    struct mutex mutex;

    unsigned int irqen;

    int irq;

    int alarm_sec;

    int alarm_min;

    int alarm_hour;

    int alarm_mday;

};