Release 4.7 drivers/rtc/rtc-ds1216.c
/*
* Dallas DS1216 RTC driver
*
* Copyright (c) 2007 Thomas Bogendoerfer
*
*/
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/bcd.h>
#include <linux/slab.h>
struct ds1216_regs {
u8 tsec;
u8 sec;
u8 min;
u8 hour;
u8 wday;
u8 mday;
u8 month;
u8 year;
};
#define DS1216_HOUR_1224 (1 << 7)
#define DS1216_HOUR_AMPM (1 << 5)
struct ds1216_priv {
struct rtc_device *rtc;
void __iomem *ioaddr;
};
static const u8 magic[] = {
0xc5, 0x3a, 0xa3, 0x5c, 0xc5, 0x3a, 0xa3, 0x5c
};
/*
* Read the 64 bit we'd like to have - It a series
* of 64 bits showing up in the LSB of the base register.
*
*/
static void ds1216_read(u8 __iomem *ioaddr, u8 *buf)
{
unsigned char c;
int i, j;
for (i = 0; i < 8; i++) {
c = 0;
for (j = 0; j < 8; j++)
c |= (readb(ioaddr) & 0x1) << j;
buf[i] = c;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas bogendoerfer | thomas bogendoerfer | 76 | 100.00% | 1 | 100.00% |
| Total | 76 | 100.00% | 1 | 100.00% |
static void ds1216_write(u8 __iomem *ioaddr, const u8 *buf)
{
unsigned char c;
int i, j;
for (i = 0; i < 8; i++) {
c = buf[i];
for (j = 0; j < 8; j++) {
writeb(c, ioaddr);
c = c >> 1;
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas bogendoerfer | thomas bogendoerfer | 75 | 100.00% | 1 | 100.00% |
| Total | 75 | 100.00% | 1 | 100.00% |
static void ds1216_switch_ds_to_clock(u8 __iomem *ioaddr)
{
/* Reset magic pointer */
readb(ioaddr);
/* Write 64 bit magic to DS1216 */
ds1216_write(ioaddr, magic);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas bogendoerfer | thomas bogendoerfer | 25 | 100.00% | 1 | 100.00% |
| Total | 25 | 100.00% | 1 | 100.00% |
static int ds1216_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct platform_device *pdev = to_platform_device(dev);
struct ds1216_priv *priv = platform_get_drvdata(pdev);
struct ds1216_regs regs;
ds1216_switch_ds_to_clock(priv->ioaddr);
ds1216_read(priv->ioaddr, (u8 *)®s);
tm->tm_sec = bcd2bin(regs.sec);
tm->tm_min = bcd2bin(regs.min);
if (regs.hour & DS1216_HOUR_1224) {
/* AM/PM mode */
tm->tm_hour = bcd2bin(regs.hour & 0x1f);
if (regs.hour & DS1216_HOUR_AMPM)
tm->tm_hour += 12;
} else
tm->tm_hour = bcd2bin(regs.hour & 0x3f);
tm->tm_wday = (regs.wday & 7) - 1;
tm->tm_mday = bcd2bin(regs.mday & 0x3f);
tm->tm_mon = bcd2bin(regs.month & 0x1f);
tm->tm_year = bcd2bin(regs.year);
if (tm->tm_year < 70)
tm->tm_year += 100;
return rtc_valid_tm(tm);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas bogendoerfer | thomas bogendoerfer | 195 | 94.66% | 1 | 33.33% |
| adrian bunk | adrian bunk | 7 | 3.40% | 1 | 33.33% |
| alessandro zummo | alessandro zummo | 4 | 1.94% | 1 | 33.33% |
| Total | 206 | 100.00% | 3 | 100.00% |
static int ds1216_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct platform_device *pdev = to_platform_device(dev);
struct ds1216_priv *priv = platform_get_drvdata(pdev);
struct ds1216_regs regs;
ds1216_switch_ds_to_clock(priv->ioaddr);
ds1216_read(priv->ioaddr, (u8 *)®s);
regs.tsec = 0; /* clear 0.1 and 0.01 seconds */
regs.sec = bin2bcd(tm->tm_sec);
regs.min = bin2bcd(tm->tm_min);
regs.hour &= DS1216_HOUR_1224;
if (regs.hour && tm->tm_hour > 12) {
regs.hour |= DS1216_HOUR_AMPM;
tm->tm_hour -= 12;
}
regs.hour |= bin2bcd(tm->tm_hour);
regs.wday &= ~7;
regs.wday |= tm->tm_wday;
regs.mday = bin2bcd(tm->tm_mday);
regs.month = bin2bcd(tm->tm_mon);
regs.year = bin2bcd(tm->tm_year % 100);
ds1216_switch_ds_to_clock(priv->ioaddr);
ds1216_write(priv->ioaddr, (u8 *)®s);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas bogendoerfer | thomas bogendoerfer | 201 | 97.10% | 1 | 50.00% |
| adrian bunk | adrian bunk | 6 | 2.90% | 1 | 50.00% |
| Total | 207 | 100.00% | 2 | 100.00% |
static const struct rtc_class_ops ds1216_rtc_ops = {
.read_time = ds1216_rtc_read_time,
.set_time = ds1216_rtc_set_time,
};
static int __init ds1216_rtc_probe(struct platform_device *pdev)
{
struct resource *res;
struct ds1216_priv *priv;
u8 dummy[8];
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->ioaddr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->ioaddr))
return PTR_ERR(priv->ioaddr);
priv->rtc = devm_rtc_device_register(&pdev->dev, "ds1216",
&ds1216_rtc_ops, THIS_MODULE);
if (IS_ERR(priv->rtc))
return PTR_ERR(priv->rtc);
/* dummy read to get clock into a known state */
ds1216_read(priv->ioaddr, dummy);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas bogendoerfer | thomas bogendoerfer | 99 | 64.71% | 1 | 25.00% |
| jingoo han | jingoo han | 27 | 17.65% | 1 | 25.00% |
| alessandro zummo | alessandro zummo | 16 | 10.46% | 1 | 25.00% |
| julia lawall | julia lawall | 11 | 7.19% | 1 | 25.00% |
| Total | 153 | 100.00% | 4 | 100.00% |
static struct platform_driver ds1216_rtc_platform_driver = {
.driver = {
.name = "rtc-ds1216",
},
};
module_platform_driver_probe(ds1216_rtc_platform_driver, ds1216_rtc_probe);
MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
MODULE_DESCRIPTION("DS1216 RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rtc-ds1216");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas bogendoerfer | thomas bogendoerfer | 815 | 90.86% | 1 | 12.50% |
| jingoo han | jingoo han | 27 | 3.01% | 1 | 12.50% |
| alessandro zummo | alessandro zummo | 22 | 2.45% | 1 | 12.50% |
| adrian bunk | adrian bunk | 13 | 1.45% | 1 | 12.50% |
| julia lawall | julia lawall | 11 | 1.23% | 1 | 12.50% |
| kay sievers | kay sievers | 5 | 0.56% | 1 | 12.50% |
| tejun heo | tejun heo | 3 | 0.33% | 1 | 12.50% |
| fabio porcedda | fabio porcedda | 1 | 0.11% | 1 | 12.50% |
| Total | 897 | 100.00% | 8 | 100.00% |
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