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Release 4.11 drivers/rtc/rtc-ds1216.c

Directory: drivers/rtc
/*
 * 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

PersonTokensPropCommitsCommitProp
Thomas Bogendoerfer76100.00%1100.00%
Total76100.00%1100.00%


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

PersonTokensPropCommitsCommitProp
Thomas Bogendoerfer75100.00%1100.00%
Total75100.00%1100.00%


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

PersonTokensPropCommitsCommitProp
Thomas Bogendoerfer25100.00%1100.00%
Total25100.00%1100.00%


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 *)&regs); 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

PersonTokensPropCommitsCommitProp
Thomas Bogendoerfer19594.66%133.33%
Adrian Bunk73.40%133.33%
Alessandro Zummo41.94%133.33%
Total206100.00%3100.00%


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 *)&regs); 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 *)&regs); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Bogendoerfer20197.10%150.00%
Adrian Bunk62.90%150.00%
Total207100.00%2100.00%

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

PersonTokensPropCommitsCommitProp
Thomas Bogendoerfer9964.71%125.00%
Jingoo Han2717.65%125.00%
Alessandro Zummo1610.46%125.00%
Julia Lawall117.19%125.00%
Total153100.00%4100.00%

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

PersonTokensPropCommitsCommitProp
Thomas Bogendoerfer81590.86%112.50%
Jingoo Han273.01%112.50%
Alessandro Zummo222.45%112.50%
Adrian Bunk131.45%112.50%
Julia Lawall111.23%112.50%
Kay Sievers50.56%112.50%
Tejun Heo30.33%112.50%
Fabio Porcedda10.11%112.50%
Total897100.00%8100.00%
Directory: drivers/rtc
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