From 5ec3e4b7aefbb8613b27ec4449fa8f9916ab9099 Mon Sep 17 00:00:00 2001 From: Atsushi Nemoto Date: Sun, 25 Jun 2006 05:48:29 -0700 Subject: [PATCH] RTC: add rtc-ds1742 driver Add an RTC driver for the Dallas DS1742 RTC chip. [akpm@osdl.org: cleanups, compile fix] Signed-off-by: Atsushi Nemoto Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-ds1742.c | 259 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 drivers/rtc/rtc-ds1742.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 40e3d9c3da844d..bccff400b198d6 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -131,6 +131,16 @@ config RTC_DRV_DS1672 This driver can also be built as a module. If so, the module will be called rtc-ds1672. +config RTC_DRV_DS1742 + tristate "Dallas DS1742" + depends on RTC_CLASS + help + If you say yes here you get support for the + Dallas DS1742 timekeeping chip. + + This driver can also be built as a module. If so, the module + will be called rtc-ds1742. + config RTC_DRV_PCF8563 tristate "Philips PCF8563/Epson RTC8564" depends on RTC_CLASS && I2C diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 1c50687fa4f332..900d210dd1a24e 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o obj-$(CONFIG_RTC_DRV_DS1307) += rtc-ds1307.o obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o +obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c new file mode 100644 index 00000000000000..8e47e5a06d2a48 --- /dev/null +++ b/drivers/rtc/rtc-ds1742.c @@ -0,0 +1,259 @@ +/* + * An rtc driver for the Dallas DS1742 + * + * Copyright (C) 2006 Atsushi Nemoto + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +#define DRV_VERSION "0.1" + +#define RTC_REG_SIZE 0x800 +#define RTC_OFFSET 0x7f8 + +#define RTC_CONTROL (RTC_OFFSET + 0) +#define RTC_CENTURY (RTC_OFFSET + 0) +#define RTC_SECONDS (RTC_OFFSET + 1) +#define RTC_MINUTES (RTC_OFFSET + 2) +#define RTC_HOURS (RTC_OFFSET + 3) +#define RTC_DAY (RTC_OFFSET + 4) +#define RTC_DATE (RTC_OFFSET + 5) +#define RTC_MONTH (RTC_OFFSET + 6) +#define RTC_YEAR (RTC_OFFSET + 7) + +#define RTC_CENTURY_MASK 0x3f +#define RTC_SECONDS_MASK 0x7f +#define RTC_DAY_MASK 0x07 + +/* Bits in the Control/Century register */ +#define RTC_WRITE 0x80 +#define RTC_READ 0x40 + +/* Bits in the Seconds register */ +#define RTC_STOP 0x80 + +/* Bits in the Day register */ +#define RTC_BATT_FLAG 0x80 + +struct rtc_plat_data { + struct rtc_device *rtc; + void __iomem *ioaddr; + unsigned long baseaddr; + unsigned long last_jiffies; +}; + +static int ds1742_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct platform_device *pdev = to_platform_device(dev); + struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + void __iomem *ioaddr = pdata->ioaddr; + u8 century; + + century = BIN2BCD((tm->tm_year + 1900) / 100); + + writeb(RTC_WRITE, ioaddr + RTC_CONTROL); + + writeb(BIN2BCD(tm->tm_year % 100), ioaddr + RTC_YEAR); + writeb(BIN2BCD(tm->tm_mon + 1), ioaddr + RTC_MONTH); + writeb(BIN2BCD(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY); + writeb(BIN2BCD(tm->tm_mday), ioaddr + RTC_DATE); + writeb(BIN2BCD(tm->tm_hour), ioaddr + RTC_HOURS); + writeb(BIN2BCD(tm->tm_min), ioaddr + RTC_MINUTES); + writeb(BIN2BCD(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS); + + /* RTC_CENTURY and RTC_CONTROL share same register */ + writeb(RTC_WRITE | (century & RTC_CENTURY_MASK), ioaddr + RTC_CENTURY); + writeb(century & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL); + return 0; +} + +static int ds1742_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct platform_device *pdev = to_platform_device(dev); + struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + void __iomem *ioaddr = pdata->ioaddr; + unsigned int year, month, day, hour, minute, second, week; + unsigned int century; + + /* give enough time to update RTC in case of continuous read */ + if (pdata->last_jiffies == jiffies) + msleep(1); + pdata->last_jiffies = jiffies; + writeb(RTC_READ, ioaddr + RTC_CONTROL); + second = readb(ioaddr + RTC_SECONDS) & RTC_SECONDS_MASK; + minute = readb(ioaddr + RTC_MINUTES); + hour = readb(ioaddr + RTC_HOURS); + day = readb(ioaddr + RTC_DATE); + week = readb(ioaddr + RTC_DAY) & RTC_DAY_MASK; + month = readb(ioaddr + RTC_MONTH); + year = readb(ioaddr + RTC_YEAR); + century = readb(ioaddr + RTC_CENTURY) & RTC_CENTURY_MASK; + writeb(0, ioaddr + RTC_CONTROL); + tm->tm_sec = BCD2BIN(second); + tm->tm_min = BCD2BIN(minute); + tm->tm_hour = BCD2BIN(hour); + tm->tm_mday = BCD2BIN(day); + tm->tm_wday = BCD2BIN(week); + tm->tm_mon = BCD2BIN(month) - 1; + /* year is 1900 + tm->tm_year */ + tm->tm_year = BCD2BIN(year) + BCD2BIN(century) * 100 - 1900; + + if (rtc_valid_tm(tm) < 0) { + dev_err(dev, "retrieved date/time is not valid.\n"); + rtc_time_to_tm(0, tm); + } + return 0; +} + +static struct rtc_class_ops ds1742_rtc_ops = { + .read_time = ds1742_rtc_read_time, + .set_time = ds1742_rtc_set_time, +}; + +static ssize_t ds1742_nvram_read(struct kobject *kobj, char *buf, + loff_t pos, size_t size) +{ + struct platform_device *pdev = + to_platform_device(container_of(kobj, struct device, kobj)); + struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + void __iomem *ioaddr = pdata->ioaddr; + ssize_t count; + + for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--) + *buf++ = readb(ioaddr + pos++); + return count; +} + +static ssize_t ds1742_nvram_write(struct kobject *kobj, char *buf, + loff_t pos, size_t size) +{ + struct platform_device *pdev = + to_platform_device(container_of(kobj, struct device, kobj)); + struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + void __iomem *ioaddr = pdata->ioaddr; + ssize_t count; + + for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--) + writeb(*buf++, ioaddr + pos++); + return count; +} + +static struct bin_attribute ds1742_nvram_attr = { + .attr = { + .name = "nvram", + .mode = S_IRUGO | S_IWUGO, + .owner = THIS_MODULE, + }, + .size = RTC_OFFSET, + .read = ds1742_nvram_read, + .write = ds1742_nvram_write, +}; + +static int __init ds1742_rtc_probe(struct platform_device *pdev) +{ + struct rtc_device *rtc; + struct resource *res; + unsigned int cen, sec; + struct rtc_plat_data *pdata = NULL; + void __iomem *ioaddr = NULL; + int ret = 0; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + if (!request_mem_region(res->start, RTC_REG_SIZE, pdev->name)) { + ret = -EBUSY; + goto out; + } + pdata->baseaddr = res->start; + ioaddr = ioremap(pdata->baseaddr, RTC_REG_SIZE); + if (!ioaddr) { + ret = -ENOMEM; + goto out; + } + pdata->ioaddr = ioaddr; + + /* turn RTC on if it was not on */ + sec = readb(ioaddr + RTC_SECONDS); + if (sec & RTC_STOP) { + sec &= RTC_SECONDS_MASK; + cen = readb(ioaddr + RTC_CENTURY) & RTC_CENTURY_MASK; + writeb(RTC_WRITE, ioaddr + RTC_CONTROL); + writeb(sec, ioaddr + RTC_SECONDS); + writeb(cen & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL); + } + if (readb(ioaddr + RTC_DAY) & RTC_BATT_FLAG) + dev_warn(&pdev->dev, "voltage-low detected.\n"); + + rtc = rtc_device_register(pdev->name, &pdev->dev, + &ds1742_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc)) { + ret = PTR_ERR(rtc); + goto out; + } + pdata->rtc = rtc; + pdata->last_jiffies = jiffies; + platform_set_drvdata(pdev, pdata); + sysfs_create_bin_file(&pdev->dev.kobj, &ds1742_nvram_attr); + return 0; + out: + if (ioaddr) + iounmap(ioaddr); + if (pdata->baseaddr) + release_mem_region(pdata->baseaddr, RTC_REG_SIZE); + kfree(pdata); + return ret; +} + +static int __devexit ds1742_rtc_remove(struct platform_device *pdev) +{ + struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + + sysfs_remove_bin_file(&pdev->dev.kobj, &ds1742_nvram_attr); + rtc_device_unregister(pdata->rtc); + iounmap(pdata->ioaddr); + release_mem_region(pdata->baseaddr, RTC_REG_SIZE); + kfree(pdata); + return 0; +} + +static struct platform_driver ds1742_rtc_driver = { + .probe = ds1742_rtc_probe, + .remove = __devexit_p(ds1742_rtc_remove), + .driver = { + .name = "ds1742", + .owner = THIS_MODULE, + }, +}; + +static __init int ds1742_init(void) +{ + return platform_driver_register(&ds1742_rtc_driver); +} + +static __exit void ds1742_exit(void) +{ + return platform_driver_unregister(&ds1742_rtc_driver); +} + +module_init(ds1742_init); +module_exit(ds1742_exit); + +MODULE_AUTHOR("Atsushi Nemoto "); +MODULE_DESCRIPTION("Dallas DS1742 RTC driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRV_VERSION); -- cgit 1.2.3-korg