linux-imx

/*

 * Copyright (C) 2012 Sven Schnelle <svens@stackframe.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.

 *

 */

​

#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/rtc.h>

#include <linux/types.h>

#include <linux/bcd.h>

#include <linux/platform_data/rtc-ds2404.h>

#include <linux/delay.h>

#include <linux/gpio.h>

#include <linux/slab.h>

​

#include <linux/io.h>

​

#define DS2404_STATUS_REG 0x200

#define DS2404_CONTROL_REG 0x201

#define DS2404_RTC_REG 0x202

​

#define DS2404_WRITE_SCRATCHPAD_CMD 0x0f

#define DS2404_READ_SCRATCHPAD_CMD 0xaa

#define DS2404_COPY_SCRATCHPAD_CMD 0x55

#define DS2404_READ_MEMORY_CMD 0xf0

​

struct ds2404;

​

struct ds2404_chip_ops {

    int (*map_io)(struct ds2404 *chip, struct platform_device *pdev,

              struct ds2404_platform_data *pdata);

    void (*unmap_io)(struct ds2404 *chip);

};

​

#define DS2404_RST  0

#define DS2404_CLK  1

#define DS2404_DQ   2

​

struct ds2404_gpio {

    const char *name;

    unsigned int gpio;

};

​

struct ds2404 {

    struct ds2404_gpio *gpio;

    const struct ds2404_chip_ops *ops;

    struct rtc_device *rtc;

};

​

static struct ds2404_gpio ds2404_gpio[] = {

    { "RTC RST", 0 },

    { "RTC CLK", 0 },

    { "RTC DQ", 0 },

};

​

static int ds2404_gpio_map(struct ds2404 *chip, struct platform_device *pdev,

              struct ds2404_platform_data *pdata)

{