diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/rtc/rtc-ds1742.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/rtc/rtc-ds1742.c | 249 |
1 files changed, 0 insertions, 249 deletions
diff --git a/ANDROID_3.4.5/drivers/rtc/rtc-ds1742.c b/ANDROID_3.4.5/drivers/rtc/rtc-ds1742.c deleted file mode 100644 index 76112667..00000000 --- a/ANDROID_3.4.5/drivers/rtc/rtc-ds1742.c +++ /dev/null @@ -1,249 +0,0 @@ -/* - * An rtc driver for the Dallas DS1742 - * - * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp> - * - * 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. - * - * Copyright (C) 2006 Torsten Ertbjerg Rasmussen <tr@newtec.dk> - * - nvram size determined from resource - * - this ds1742 driver now supports ds1743. - */ - -#include <linux/bcd.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/gfp.h> -#include <linux/delay.h> -#include <linux/jiffies.h> -#include <linux/rtc.h> -#include <linux/platform_device.h> -#include <linux/io.h> -#include <linux/module.h> - -#define DRV_VERSION "0.4" - -#define RTC_SIZE 8 - -#define RTC_CONTROL 0 -#define RTC_CENTURY 0 -#define RTC_SECONDS 1 -#define RTC_MINUTES 2 -#define RTC_HOURS 3 -#define RTC_DAY 4 -#define RTC_DATE 5 -#define RTC_MONTH 6 -#define RTC_YEAR 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_nvram; - void __iomem *ioaddr_rtc; - size_t size_nvram; - size_t size; - unsigned long last_jiffies; - struct bin_attribute nvram_attr; -}; - -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_rtc; - 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_rtc; - 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 const 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 file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t pos, size_t size) -{ - struct device *dev = container_of(kobj, struct device, kobj); - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); - void __iomem *ioaddr = pdata->ioaddr_nvram; - ssize_t count; - - for (count = 0; size > 0 && pos < pdata->size_nvram; count++, size--) - *buf++ = readb(ioaddr + pos++); - return count; -} - -static ssize_t ds1742_nvram_write(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t pos, size_t size) -{ - struct device *dev = container_of(kobj, struct device, kobj); - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); - void __iomem *ioaddr = pdata->ioaddr_nvram; - ssize_t count; - - for (count = 0; size > 0 && pos < pdata->size_nvram; count++, size--) - writeb(*buf++, ioaddr + pos++); - return count; -} - -static int __devinit ds1742_rtc_probe(struct platform_device *pdev) -{ - struct rtc_device *rtc; - struct resource *res; - unsigned int cen, sec; - struct rtc_plat_data *pdata; - void __iomem *ioaddr; - int ret = 0; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); - if (!pdata) - return -ENOMEM; - pdata->size = resource_size(res); - if (!devm_request_mem_region(&pdev->dev, res->start, pdata->size, - pdev->name)) - return -EBUSY; - ioaddr = devm_ioremap(&pdev->dev, res->start, pdata->size); - if (!ioaddr) - return -ENOMEM; - - pdata->ioaddr_nvram = ioaddr; - pdata->size_nvram = pdata->size - RTC_SIZE; - pdata->ioaddr_rtc = ioaddr + pdata->size_nvram; - - sysfs_bin_attr_init(&pdata->nvram_attr); - pdata->nvram_attr.attr.name = "nvram"; - pdata->nvram_attr.attr.mode = S_IRUGO | S_IWUSR; - pdata->nvram_attr.read = ds1742_nvram_read; - pdata->nvram_attr.write = ds1742_nvram_write; - pdata->nvram_attr.size = pdata->size_nvram; - - /* turn RTC on if it was not on */ - ioaddr = pdata->ioaddr_rtc; - 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"); - - pdata->last_jiffies = jiffies; - platform_set_drvdata(pdev, pdata); - rtc = rtc_device_register(pdev->name, &pdev->dev, - &ds1742_rtc_ops, THIS_MODULE); - if (IS_ERR(rtc)) - return PTR_ERR(rtc); - pdata->rtc = rtc; - - ret = sysfs_create_bin_file(&pdev->dev.kobj, &pdata->nvram_attr); - if (ret) { - dev_err(&pdev->dev, "creating nvram file in sysfs failed\n"); - rtc_device_unregister(rtc); - } - 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, &pdata->nvram_attr); - rtc_device_unregister(pdata->rtc); - return 0; -} - -static struct platform_driver ds1742_rtc_driver = { - .probe = ds1742_rtc_probe, - .remove = __devexit_p(ds1742_rtc_remove), - .driver = { - .name = "rtc-ds1742", - .owner = THIS_MODULE, - }, -}; - -module_platform_driver(ds1742_rtc_driver); - -MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); -MODULE_DESCRIPTION("Dallas DS1742 RTC driver"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(DRV_VERSION); -MODULE_ALIAS("platform:rtc-ds1742"); |