rtc: add Dallas DS1390/93/94 RTC chips
Add support for the Dallas DS1390/93/94 SPI RTC chip. Signed-off-by: Mark Jackson <mpfj@mimc.co.uk> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
a7fa9851b6
commit
06de180851
3 changed files with 232 additions and 0 deletions
|
@ -310,6 +310,17 @@ config RTC_DRV_DS1305
|
|||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-ds1305.
|
||||
|
||||
config RTC_DRV_DS1390
|
||||
tristate "Dallas/Maxim DS1390/93/94"
|
||||
help
|
||||
If you say yes here you get support for the DS1390/93/94 chips.
|
||||
|
||||
This driver only supports the RTC feature, and not other chip
|
||||
features such as alarms and trickle charging.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-ds1390.
|
||||
|
||||
config RTC_DRV_MAX6902
|
||||
tristate "Maxim MAX6902"
|
||||
help
|
||||
|
|
|
@ -28,6 +28,7 @@ obj-$(CONFIG_RTC_DRV_DS1302) += rtc-ds1302.o
|
|||
obj-$(CONFIG_RTC_DRV_DS1305) += rtc-ds1305.o
|
||||
obj-$(CONFIG_RTC_DRV_DS1307) += rtc-ds1307.o
|
||||
obj-$(CONFIG_RTC_DRV_DS1374) += rtc-ds1374.o
|
||||
obj-$(CONFIG_RTC_DRV_DS1390) += rtc-ds1390.o
|
||||
obj-$(CONFIG_RTC_DRV_DS1511) += rtc-ds1511.o
|
||||
obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
|
||||
obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
|
||||
|
|
220
drivers/rtc/rtc-ds1390.c
Normal file
220
drivers/rtc/rtc-ds1390.c
Normal file
|
@ -0,0 +1,220 @@
|
|||
/*
|
||||
* rtc-ds1390.c -- driver for DS1390/93/94
|
||||
*
|
||||
* Copyright (C) 2008 Mercury IMC Ltd
|
||||
* Written by Mark Jackson <mpfj@mimc.co.uk>
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* NOTE : Currently this driver only supports the bare minimum for read
|
||||
* and write the RTC. The extra features provided by the chip family
|
||||
* (alarms, trickle charger, different control registers) are unavailable.
|
||||
*/
|
||||
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/rtc.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/bcd.h>
|
||||
|
||||
#define DS1390_REG_100THS 0x00
|
||||
#define DS1390_REG_SECONDS 0x01
|
||||
#define DS1390_REG_MINUTES 0x02
|
||||
#define DS1390_REG_HOURS 0x03
|
||||
#define DS1390_REG_DAY 0x04
|
||||
#define DS1390_REG_DATE 0x05
|
||||
#define DS1390_REG_MONTH_CENT 0x06
|
||||
#define DS1390_REG_YEAR 0x07
|
||||
|
||||
#define DS1390_REG_ALARM_100THS 0x08
|
||||
#define DS1390_REG_ALARM_SECONDS 0x09
|
||||
#define DS1390_REG_ALARM_MINUTES 0x0A
|
||||
#define DS1390_REG_ALARM_HOURS 0x0B
|
||||
#define DS1390_REG_ALARM_DAY_DATE 0x0C
|
||||
|
||||
#define DS1390_REG_CONTROL 0x0D
|
||||
#define DS1390_REG_STATUS 0x0E
|
||||
#define DS1390_REG_TRICKLE 0x0F
|
||||
|
||||
struct ds1390 {
|
||||
struct rtc_device *rtc;
|
||||
u8 txrx_buf[9]; /* cmd + 8 registers */
|
||||
};
|
||||
|
||||
static void ds1390_set_reg(struct device *dev, unsigned char address,
|
||||
unsigned char data)
|
||||
{
|
||||
struct spi_device *spi = to_spi_device(dev);
|
||||
struct ds1390 *chip = dev_get_drvdata(dev);
|
||||
|
||||
/* Set MSB to indicate write */
|
||||
chip->txrx_buf[0] = address | 0x80;
|
||||
chip->txrx_buf[1] = data;
|
||||
|
||||
/* do the i/o */
|
||||
spi_write_then_read(spi, chip->txrx_buf, 2, NULL, 0);
|
||||
}
|
||||
|
||||
static int ds1390_get_reg(struct device *dev, unsigned char address,
|
||||
unsigned char *data)
|
||||
{
|
||||
struct spi_device *spi = to_spi_device(dev);
|
||||
struct ds1390 *chip = dev_get_drvdata(dev);
|
||||
int status;
|
||||
|
||||
if (!data)
|
||||
return -EINVAL;
|
||||
|
||||
/* Clear MSB to indicate read */
|
||||
chip->txrx_buf[0] = address & 0x7f;
|
||||
/* do the i/o */
|
||||
status = spi_write_then_read(spi, chip->txrx_buf, 1, chip->txrx_buf, 1);
|
||||
if (status != 0)
|
||||
return status;
|
||||
|
||||
*data = chip->txrx_buf[1];
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ds1390_get_datetime(struct device *dev, struct rtc_time *dt)
|
||||
{
|
||||
struct spi_device *spi = to_spi_device(dev);
|
||||
struct ds1390 *chip = dev_get_drvdata(dev);
|
||||
int status;
|
||||
|
||||
/* build the message */
|
||||
chip->txrx_buf[0] = DS1390_REG_SECONDS;
|
||||
|
||||
/* do the i/o */
|
||||
status = spi_write_then_read(spi, chip->txrx_buf, 1, chip->txrx_buf, 8);
|
||||
if (status != 0)
|
||||
return status;
|
||||
|
||||
/* The chip sends data in this order:
|
||||
* Seconds, Minutes, Hours, Day, Date, Month / Century, Year */
|
||||
dt->tm_sec = bcd2bin(chip->txrx_buf[0]);
|
||||
dt->tm_min = bcd2bin(chip->txrx_buf[1]);
|
||||
dt->tm_hour = bcd2bin(chip->txrx_buf[2]);
|
||||
dt->tm_wday = bcd2bin(chip->txrx_buf[3]);
|
||||
dt->tm_mday = bcd2bin(chip->txrx_buf[4]);
|
||||
/* mask off century bit */
|
||||
dt->tm_mon = bcd2bin(chip->txrx_buf[5] & 0x7f) - 1;
|
||||
/* adjust for century bit */
|
||||
dt->tm_year = bcd2bin(chip->txrx_buf[6]) + ((chip->txrx_buf[5] & 0x80) ? 100 : 0);
|
||||
|
||||
return rtc_valid_tm(dt);
|
||||
}
|
||||
|
||||
static int ds1390_set_datetime(struct device *dev, struct rtc_time *dt)
|
||||
{
|
||||
struct spi_device *spi = to_spi_device(dev);
|
||||
struct ds1390 *chip = dev_get_drvdata(dev);
|
||||
|
||||
/* build the message */
|
||||
chip->txrx_buf[0] = DS1390_REG_SECONDS | 0x80;
|
||||
chip->txrx_buf[1] = bin2bcd(dt->tm_sec);
|
||||
chip->txrx_buf[2] = bin2bcd(dt->tm_min);
|
||||
chip->txrx_buf[3] = bin2bcd(dt->tm_hour);
|
||||
chip->txrx_buf[4] = bin2bcd(dt->tm_wday);
|
||||
chip->txrx_buf[5] = bin2bcd(dt->tm_mday);
|
||||
chip->txrx_buf[6] = bin2bcd(dt->tm_mon + 1) |
|
||||
((dt->tm_year > 99) ? 0x80 : 0x00);
|
||||
chip->txrx_buf[7] = bin2bcd(dt->tm_year % 100);
|
||||
|
||||
/* do the i/o */
|
||||
return spi_write_then_read(spi, chip->txrx_buf, 8, NULL, 0);
|
||||
}
|
||||
|
||||
static int ds1390_read_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
return ds1390_get_datetime(dev, tm);
|
||||
}
|
||||
|
||||
static int ds1390_set_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
return ds1390_set_datetime(dev, tm);
|
||||
}
|
||||
|
||||
static const struct rtc_class_ops ds1390_rtc_ops = {
|
||||
.read_time = ds1390_read_time,
|
||||
.set_time = ds1390_set_time,
|
||||
};
|
||||
|
||||
static int __devinit ds1390_probe(struct spi_device *spi)
|
||||
{
|
||||
struct rtc_device *rtc;
|
||||
unsigned char tmp;
|
||||
struct ds1390 *chip;
|
||||
int res;
|
||||
|
||||
printk(KERN_DEBUG "DS1390 SPI RTC driver\n");
|
||||
|
||||
rtc = rtc_device_register("ds1390",
|
||||
&spi->dev, &ds1390_rtc_ops, THIS_MODULE);
|
||||
if (IS_ERR(rtc)) {
|
||||
printk(KERN_ALERT "RTC : unable to register device\n");
|
||||
return PTR_ERR(rtc);
|
||||
}
|
||||
|
||||
spi->mode = SPI_MODE_3;
|
||||
spi->bits_per_word = 8;
|
||||
spi_setup(spi);
|
||||
|
||||
chip = kzalloc(sizeof *chip, GFP_KERNEL);
|
||||
if (!chip) {
|
||||
printk(KERN_ALERT "RTC : unable to allocate device memory\n");
|
||||
rtc_device_unregister(rtc);
|
||||
return -ENOMEM;
|
||||
}
|
||||
chip->rtc = rtc;
|
||||
dev_set_drvdata(&spi->dev, chip);
|
||||
|
||||
res = ds1390_get_reg(&spi->dev, DS1390_REG_SECONDS, &tmp);
|
||||
if (res) {
|
||||
printk(KERN_ALERT "RTC : unable to read device\n");
|
||||
rtc_device_unregister(rtc);
|
||||
return res;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devexit ds1390_remove(struct spi_device *spi)
|
||||
{
|
||||
struct ds1390 *chip = platform_get_drvdata(spi);
|
||||
struct rtc_device *rtc = chip->rtc;
|
||||
|
||||
if (rtc)
|
||||
rtc_device_unregister(rtc);
|
||||
|
||||
kfree(chip);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct spi_driver ds1390_driver = {
|
||||
.driver = {
|
||||
.name = "rtc-ds1390",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = ds1390_probe,
|
||||
.remove = __devexit_p(ds1390_remove),
|
||||
};
|
||||
|
||||
static __init int ds1390_init(void)
|
||||
{
|
||||
return spi_register_driver(&ds1390_driver);
|
||||
}
|
||||
module_init(ds1390_init);
|
||||
|
||||
static __exit void ds1390_exit(void)
|
||||
{
|
||||
spi_unregister_driver(&ds1390_driver);
|
||||
}
|
||||
module_exit(ds1390_exit);
|
||||
|
||||
MODULE_DESCRIPTION("DS1390/93/94 SPI RTC driver");
|
||||
MODULE_AUTHOR("Mark Jackson <mpfj@mimc.co.uk>");
|
||||
MODULE_LICENSE("GPL");
|
Loading…
Reference in a new issue