linux-imx

/*

 * Intersil ISL1208 rtc class driver

 *

 * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org>

 *

 *  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.

 *

 */

​

#include <linux/bcd.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/of_irq.h>

#include <linux/rtc.h>

​

/* Register map */

/* rtc section */

#define ISL1208_REG_SC  0x00

#define ISL1208_REG_MN  0x01

#define ISL1208_REG_HR  0x02

#define ISL1208_REG_HR_MIL     (1<<7)   /* 24h/12h mode */

#define ISL1208_REG_HR_PM      (1<<5)   /* PM/AM bit in 12h mode */

#define ISL1208_REG_DT  0x03

#define ISL1208_REG_MO  0x04

#define ISL1208_REG_YR  0x05

#define ISL1208_REG_DW  0x06

#define ISL1208_RTC_SECTION_LEN 7

​

/* control/status section */

#define ISL1208_REG_SR  0x07

#define ISL1208_REG_SR_ARST    (1<<7)   /* auto reset */

#define ISL1208_REG_SR_XTOSCB  (1<<6)   /* crystal oscillator */

#define ISL1208_REG_SR_WRTC    (1<<4)   /* write rtc */

#define ISL1208_REG_SR_EVT     (1<<3)   /* event */

#define ISL1208_REG_SR_ALM     (1<<2)   /* alarm */

#define ISL1208_REG_SR_BAT     (1<<1)   /* battery */

#define ISL1208_REG_SR_RTCF    (1<<0)   /* rtc fail */

#define ISL1208_REG_INT 0x08

#define ISL1208_REG_INT_ALME   (1<<6)   /* alarm enable */

#define ISL1208_REG_INT_IM     (1<<7)   /* interrupt/alarm mode */

#define ISL1219_REG_EV  0x09

#define ISL1219_REG_EV_EVEN    (1<<4)   /* event detection enable */

#define ISL1219_REG_EV_EVIENB  (1<<7)   /* event in pull-up disable */

#define ISL1208_REG_ATR 0x0a

#define ISL1208_REG_DTR 0x0b

​

/* alarm section */

#define ISL1208_REG_SCA 0x0c

#define ISL1208_REG_MNA 0x0d

#define ISL1208_REG_HRA 0x0e

#define ISL1208_REG_DTA 0x0f

#define ISL1208_REG_MOA 0x10

#define ISL1208_REG_DWA 0x11

#define ISL1208_ALARM_SECTION_LEN 6

​

/* user section */

#define ISL1208_REG_USR1 0x12

#define ISL1208_REG_USR2 0x13

#define ISL1208_USR_SECTION_LEN 2

​

/* event section */

#define ISL1219_REG_SCT 0x14

#define ISL1219_REG_MNT 0x15

#define ISL1219_REG_HRT 0x16

#define ISL1219_REG_DTT 0x17

#define ISL1219_REG_MOT 0x18

#define ISL1219_REG_YRT 0x19

#define ISL1219_EVT_SECTION_LEN 6

​

static struct i2c_driver isl1208_driver;

​

/* ISL1208 various variants */

enum isl1208_id {

    TYPE_ISL1208 = 0,

    TYPE_ISL1209,

    TYPE_ISL1218,

    TYPE_ISL1219,

    ISL_LAST_ID

};

​

/* Chip capabilities table */

static const struct isl1208_config {

    const char  name[8];

    unsigned int    nvmem_length;

    unsigned    has_tamper:1;

    unsigned    has_timestamp:1;

} isl1208_configs[] = {

    [TYPE_ISL1208] = { "isl1208", 2, false, false },