linux-imx

/*

 * A SPI driver for the Ricoh RS5C348 RTC

 *

 * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>

 *

 * 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.

 *

 * The board specific init code should provide characteristics of this

 * device:

 *     Mode 1 (High-Active, Shift-Then-Sample), High Avtive CS

 */

​

#include <linux/bcd.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/slab.h>

#include <linux/rtc.h>

#include <linux/workqueue.h>

#include <linux/spi/spi.h>

#include <linux/module.h>

​

#define RS5C348_REG_SECS    0

#define RS5C348_REG_MINS    1

#define RS5C348_REG_HOURS   2

#define RS5C348_REG_WDAY    3

#define RS5C348_REG_DAY 4

#define RS5C348_REG_MONTH   5

#define RS5C348_REG_YEAR    6

#define RS5C348_REG_CTL1    14

#define RS5C348_REG_CTL2    15

​

#define RS5C348_SECS_MASK   0x7f

#define RS5C348_MINS_MASK   0x7f

#define RS5C348_HOURS_MASK  0x3f

#define RS5C348_WDAY_MASK   0x03

#define RS5C348_DAY_MASK    0x3f

#define RS5C348_MONTH_MASK  0x1f

​

#define RS5C348_BIT_PM  0x20    /* REG_HOURS */

#define RS5C348_BIT_Y2K 0x80    /* REG_MONTH */

#define RS5C348_BIT_24H 0x20    /* REG_CTL1 */

#define RS5C348_BIT_XSTP    0x10    /* REG_CTL2 */

#define RS5C348_BIT_VDET    0x40    /* REG_CTL2 */

​

#define RS5C348_CMD_W(addr) (((addr) << 4) | 0x08)  /* single write */

#define RS5C348_CMD_R(addr) (((addr) << 4) | 0x0c)  /* single read */

#define RS5C348_CMD_MW(addr)    (((addr) << 4) | 0x00)  /* burst write */

#define RS5C348_CMD_MR(addr)    (((addr) << 4) | 0x04)  /* burst read */

​

struct rs5c348_plat_data {

    struct rtc_device *rtc;

    int rtc_24h;

};

​

static int

rs5c348_rtc_set_time(struct device *dev, struct rtc_time *tm)

{