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/*
* An i2c driver for the Xicor/Intersil X1205 RTC
* Copyright 2004 Karen Spearel
* Copyright 2005 Alessandro Zummo
*
* please send all reports to:
* Karen Spearel <kas111 at gmail dot com>
* Alessandro Zummo <a.zummo@towertech.it>
*
* based on a lot of other RTC drivers.
*
* Information and datasheet:
* http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html
*
* 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/i2c.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#define DRV_VERSION "1.0.7"
/* Addresses to scan: none. This chip is located at
* 0x6f and uses a two bytes register addressing.
* Two bytes need to be written to read a single register,
* while most other chips just require one and take the second
* one as the data to be written. To prevent corrupting
* unknown chips, the user must explicitly set the probe parameter.
*/
static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
/* Insmod parameters */
I2C_CLIENT_INSMOD;
/* offsets into CCR area */
#define CCR_SEC 0
#define CCR_MIN 1
#define CCR_HOUR 2
#define CCR_MDAY 3
#define CCR_MONTH 4
#define CCR_YEAR 5
#define CCR_WDAY 6
#define CCR_Y2K 7
#define X1205_REG_SR 0x3F /* status register */
#define X1205_REG_Y2K 0x37
#define X1205_REG_DW 0x36
#define X1205_REG_YR 0x35
#define X1205_REG_MO 0x34
#define X1205_REG_DT 0x33
#define X1205_REG_HR 0x32
#define X1205_REG_MN 0x31
#define X1205_REG_SC 0x30
#define X1205_REG_DTR 0x13
#define X1205_REG_ATR 0x12
#define X1205_REG_INT 0x11
#define X1205_REG_0 0x10
#define X1205_REG_Y2K1 0x0F
#define X1205_REG_DWA1 0x0E
#define X1205_REG_YRA1 0x0D
#define X1205_REG_MOA1 0x0C
#define X1205_REG_DTA1 0x0B
#define X1205_REG_HRA1 0x0A
#define X1205_REG_MNA1 0x09
#define X1205_REG_SCA1 0x08
#define X1205_REG_Y2K0 0x07
#define X1205_REG_DWA0 0x06
#define X1205_REG_YRA0 0x05
#define X1205_REG_MOA0 0x04
#define X1205_REG_DTA0 0x03
#define X1205_REG_HRA0 0x02
#define X1205_REG_MNA0 0x01
#define X1205_REG_SCA0 0x00
#define X1205_CCR_BASE 0x30 /* Base address of CCR */
#define X1205_ALM0_BASE 0x00 /* Base address of ALARM0 */
#define X1205_SR_RTCF 0x01 /* Clock failure */
#define X1205_SR_WEL 0x02 /* Write Enable Latch */
#define X1205_SR_RWEL 0x04 /* Register Write Enable */
#define X1205_DTR_DTR0 0x01
#define X1205_DTR_DTR1 0x02
#define X1205_DTR_DTR2 0x04
#define X1205_HR_MIL 0x80 /* Set in ccr.hour for 24 hr mode */
/* Prototypes */
static int x1205_attach(struct i2c_adapter *adapter);
static int x1205_detach(struct i2c_client *client);
static int x1205_probe(struct i2c_adapter *adapter, int address, int kind);
static struct i2c_driver x1205_driver = {
.driver = {
.name = "x1205",
},
.id = I2C_DRIVERID_X1205,
.attach_adapter = &x1205_attach,
.detach_client = &x1205_detach,
};
/*
* In the routines that deal directly with the x1205 hardware, we use
* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
* Epoch is initialized as 2000. Time is set to UTC.
*/
static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm,
unsigned char reg_base)
{
unsigned char dt_addr[2] = { 0, reg_base };
unsigned char buf[8];
struct i2c_msg msgs[] = {
{ client->addr, 0, 2, dt_addr }, /* setup read ptr */
{ client->addr, I2C_M_RD, 8, buf }, /* read date */
};
/* read date registers */
if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
return -EIO;
}
dev_dbg(&client->dev,
"%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
"mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
__FUNCTION__,
buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5], buf[6], buf[7]);
tm->tm_sec = BCD2BIN(buf[CCR_SEC]);
tm->tm_min = BCD2BIN(buf[CCR_MIN]);
tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
tm->tm_mon = BCD2BIN(buf[CCR_MONTH]) - 1; /* mon is 0-11 */
tm->tm_year = BCD2BIN(buf[CCR_YEAR])
+ (BCD2BIN(buf[CCR_Y2K]) * 100) - 1900;
tm->tm_wday = buf[CCR_WDAY];
dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__FUNCTION__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
return 0;
}
static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
{
static unsigned char sr_addr[2] = { 0, X1205_REG_SR };
struct i2c_msg msgs[] = {
{ client->addr, 0, 2, sr_addr }, /* setup read ptr */
{ client->addr, I2C_M_RD, 1, sr }, /* read status */
};
/* read status register */
if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
return -EIO;
}
return 0;
}
static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
int datetoo, u8 reg_base)
{
int i, xfer;
unsigned char buf[8];
static const unsigned char wel[3] = { 0, X1205_REG_SR,
X1205_SR_WEL };
static const unsigned char rwel[3] = { 0, X1205_REG_SR,
X1205_SR_WEL | X1205_SR_RWEL };
static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 };
dev_dbg(&client->dev,
"%s: secs=%d, mins=%d, hours=%d\n",
__FUNCTION__,
tm->tm_sec, tm->tm_min, tm->tm_hour);
buf[CCR_SEC] = BIN2BCD(tm->tm_sec);
buf[CCR_MIN] = BIN2BCD(tm->tm_min);
/* set hour and 24hr bit */
buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_HR_MIL;
/* should we also set the date? */
if (datetoo) {
dev_dbg(&client->dev,
"%s: mday=%d, mon=%d, year=%d, wday=%d\n",
__FUNCTION__,
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
buf[CCR_MDAY] = BIN2BCD(tm->tm_mday);
/* month, 1 - 12 */
buf[CCR_MONTH] = BIN2BCD(tm->tm_mon + 1);
/* year, since the rtc epoch*/
buf[CCR_YEAR] = BIN2BCD(tm->tm_year % 100);
buf[CCR_WDAY] = tm->tm_wday & 0x07;
buf[CCR_Y2K] = BIN2BCD(tm->tm_year / 100);
}
/* this sequence is required to unlock the chip */
if ((xfer = i2c_master_send(client, wel, 3)) != 3) {
dev_err(&client->dev, "%s: wel - %d\n", __FUNCTION__, xfer);
return -EIO;
}
if ((xfer = i2c_master_send(client, rwel, 3)) != 3) {
dev_err(&client->dev, "%s: rwel - %d\n", __FUNCTION__, xfer);
return -EIO;
}
/* write register's data */
for (i = 0; i < (datetoo
|