1 /* rtc-generic: RTC driver using the generic RTC abstraction 2 * 3 * Copyright (C) 2008 Kyle McMartin <kyle@mcmartin.ca> 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/module.h> 8 #include <linux/time.h> 9 #include <linux/platform_device.h> 10 #include <linux/rtc.h> 11 12 #include <asm/rtc.h> 13 14 static int generic_get_time(struct device *dev, struct rtc_time *tm) 15 { 16 unsigned int ret = get_rtc_time(tm); 17 18 if (ret & RTC_BATT_BAD) 19 return -EOPNOTSUPP; 20 21 return rtc_valid_tm(tm); 22 } 23 24 static int generic_set_time(struct device *dev, struct rtc_time *tm) 25 { 26 if (set_rtc_time(tm) < 0) 27 return -EOPNOTSUPP; 28 29 return 0; 30 } 31 32 static const struct rtc_class_ops generic_rtc_ops = { 33 .read_time = generic_get_time, 34 .set_time = generic_set_time, 35 }; 36 37 static int __init generic_rtc_probe(struct platform_device *dev) 38 { 39 struct rtc_device *rtc; 40 41 rtc = devm_rtc_device_register(&dev->dev, "rtc-generic", 42 &generic_rtc_ops, THIS_MODULE); 43 if (IS_ERR(rtc)) 44 return PTR_ERR(rtc); 45 46 platform_set_drvdata(dev, rtc); 47 48 return 0; 49 } 50 51 static struct platform_driver generic_rtc_driver = { 52 .driver = { 53 .name = "rtc-generic", 54 }, 55 }; 56 57 module_platform_driver_probe(generic_rtc_driver, generic_rtc_probe); 58 59 MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>"); 60 MODULE_LICENSE("GPL"); 61 MODULE_DESCRIPTION("Generic RTC driver"); 62 MODULE_ALIAS("platform:rtc-generic"); 63