linux-imx

/*

 * Driver for TI BQ32000 RTC.

 *

 * Copyright (C) 2009 Semihalf.

 * Copyright (C) 2014 Pavel Machek <pavel@denx.de>

 *

 * 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.

 *

 * You can get hardware description at

 * http://www.ti.com/lit/ds/symlink/bq32000.pdf

 */

​

#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/rtc.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/bcd.h>

​

#define BQ32K_SECONDS       0x00    /* Seconds register address */

#define BQ32K_SECONDS_MASK  0x7F    /* Mask over seconds value */

#define BQ32K_STOP      0x80    /* Oscillator Stop flat */

​

#define BQ32K_MINUTES       0x01    /* Minutes register address */

#define BQ32K_MINUTES_MASK  0x7F    /* Mask over minutes value */

#define BQ32K_OF        0x80    /* Oscillator Failure flag */

​

#define BQ32K_HOURS_MASK    0x3F    /* Mask over hours value */

#define BQ32K_CENT      0x40    /* Century flag */

#define BQ32K_CENT_EN       0x80    /* Century flag enable bit */

​

#define BQ32K_CALIBRATION   0x07    /* CAL_CFG1, calibration and control */

#define BQ32K_TCH2      0x08    /* Trickle charge enable */

#define BQ32K_CFG2      0x09    /* Trickle charger control */

#define BQ32K_TCFE      BIT(6)  /* Trickle charge FET bypass */

​

#define MAX_LEN         10  /* Maximum number of consecutive

                     * register for this particular RTC.

                     */

​

struct bq32k_regs {

    uint8_t     seconds;

    uint8_t     minutes;

    uint8_t     cent_hours;

    uint8_t     day;

    uint8_t     date;

    uint8_t     month;

    uint8_t     years;

};

​

static struct i2c_driver bq32k_driver;

​

static int bq32k_read(struct device *dev, void *data, uint8_t off, uint8_t len)

{

    struct i2c_client *client = to_i2c_client(dev);

    struct i2c_msg msgs[] = {

        {

            .addr = client->addr,

            .flags = 0,

            .len = 1,

            .buf = &off,