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