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/*
* Driver for Epson's RTC module RX-8025 SA/NB
*
* Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
*
* Copyright (C) 2005 by Digi International Inc.
* All rights reserved.
*
* Modified by fengjh at rising.com.cn
* <http://lists.lm-sensors.org/mailman/listinfo/lm-sensors>
* 2006.11
*
* Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com>
* Converted to new style by Wolfgang Grandegger <wg@grandegger.com>
* Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com>
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/bcd.h>
#include <linux/i2c.h>
#include <linux/list.h>
#include <linux/rtc.h>
/* Register definitions */
#define RX8025_REG_SEC 0x00
#define RX8025_REG_MIN 0x01
#define RX8025_REG_HOUR 0x02
#define RX8025_REG_WDAY 0x03
#define RX8025_REG_MDAY 0x04
#define RX8025_REG_MONTH 0x05
#define RX8025_REG_YEAR 0x06
#define RX8025_REG_DIGOFF 0x07
#define RX8025_REG_ALWMIN 0x08
#define RX8025_REG_ALWHOUR 0x09
#define RX8025_REG_ALWWDAY 0x0a
#define RX8025_REG_ALDMIN 0x0b
#define RX8025_REG_ALDHOUR 0x0c
/* 0x0d is reserved */
#define RX8025_REG_CTRL1 0x0e
#define RX8025_REG_CTRL2 0x0f
#define RX8025_BIT_CTRL1_CT (7 << 0)
/* 1 Hz periodic level irq */
#define RX8025_BIT_CTRL1_CT_1HZ 4
#define RX8025_BIT_CTRL1_TEST (1 << 3)
#define RX8025_BIT_CTRL1_1224 (1 << 5)
#define RX8025_BIT_CTRL1_DALE (1 << 6)
#define RX8025_BIT_CTRL1_WALE (1 << 7)
#define RX8025_BIT_CTRL2_DAFG (1 << 0)
#define RX8025_BIT_CTRL2_WAFG (1 << 1)
#define RX8025_BIT_CTRL2_CTFG (1 << 2)
#define RX8025_BIT_CTRL2_PON (1 << 4)
#define RX8025_BIT_CTRL2_XST (1 << 5)
#define RX8025_BIT_CTRL2_VDET (1 << 6)
/* Clock precision adjustment */
#define RX8025_ADJ_RESOLUTION 3050 /* in ppb */
#define RX8025_ADJ_DATA_MAX 62
#define RX8025_ADJ_DATA_MIN -62
static const struct i2c_device_id rx8025_id[] = {
{ "rx8025", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, rx8025_id);
struct rx8025_data {
struct i2c_client *client;
struct rtc_device *rtc;
struct work_struct work;
u8 ctrl1;
unsigned exiting:1;
};
static int rx8025_read_reg(struct i2c_client *client, int number, u8 *value)
{
int ret = i2c_smbus_read_byte_data(client, (number << 4) | 0x08);
if (ret < 0) {
dev_err(&client->dev, "Unable to read register #%d\n", number);
return ret;
}
*value = ret;
return 0;
}
static int rx8025_read_regs(struct i2c_client *client,
int number, u8 length, u8 *values)
{
int ret = i2c_smbus_read_i2c_block_data(client, (number << 4) | 0x08,
length, values);
if (ret != length) {
dev_err(&client->dev, "Unable to read registers #%d..#%d\n",
number, number + length - 1);
return ret < 0 ? ret : -EIO;
}
return 0;
}
static int rx8025_write_reg(struct i2c_client *client, int number, u8 value)
{
int ret = i2c_smbus_write_byte_data(client, number << 4, value);
if (ret)
dev_err(&client->dev, "Unable to write register #%d\n",
number);
return ret;
}
static int rx8025_write_regs(struct i2c_client *client,
int number, u8 length, u8 *values)
{
int ret = i2c_smbus_write_i2c_block_data(client, (number << 4) | 0x08,
length, values);
if (ret)
dev_err(&client->dev, "Unable to write registers #%d..#%d\n",
number, number + length - 1);
return ret;
}
static irqreturn_t rx8025_irq(int irq, void *dev_id)
{
struct i2c_client *client = dev_id;
struct rx8025_data *rx8025 = i2c_get_clientdata(client);
disable_irq_nosync(irq);
schedule_work(&rx8025->work);
return IRQ_HANDLED;
}
static void rx8025_work(struct work_struct *work)
{
struct rx8025_data *rx8025 = container_of(work, struct rx8025_data,
work);
struct i2c_client *client = rx8025->client;
struct mutex *lock = &rx8025->rtc->ops_lock;
u8 status;
mutex_lock(lock);
if (rx8025_read_reg(client, RX8025_REG_CTRL2, &status))
goto out;
if (!(status & RX8025_BIT_CTRL2_XST))
dev_warn(&client->dev, "Oscillation stop was detected,"
"you may have to readjust the clock\n");
if (status & RX8025_BIT_CTRL2_CTFG) {
/* periodic */
status &= ~RX8025_BIT_CTRL2_CTFG;
local_irq_disable();
rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF);
local_irq_enable();
}
if (status & RX8025_BIT_CTRL2_DAFG) {
/* alarm */
status &= RX8025_BIT_CTRL2_DAFG;
if (rx8025_write_reg(client, RX8025_REG_CTRL1,
rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE))
goto out;
local_irq_disable();
rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
local_irq_enable();
}
/* acknowledge IRQ */
rx8025_write_reg(client, RX8025_REG_CTRL2,
status | RX8025_BIT_CTRL2_XST);
out:
if (!rx8025->exiting)
enable_irq(client->irq);
mutex_unlock(lock);
}
static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
{
struct rx8025_data *rx8025 = dev_get_drvdata(dev);
u8 date[7];
int err;
err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date);
if (err)
return err;
dev_dbg(dev, "%s: read 0x%02x 0x%02x "
"0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__,
date[0], date[1], date[2], date[3], date[4],
date[5], date[6]);
dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f);
dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f);
if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f);
else
dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12
+ (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0);
dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]);
if (dt->tm_year < 70)
dt->tm_year += 100;
dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
dt->tm_sec, dt->tm_min, dt->tm_hour,
dt->tm_mday, dt->tm_mon, dt->tm_year);
return rtc_valid_tm(
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