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 #if defined(CONFIG_M68K) || defined(CONFIG_PARISC) || \ 13 defined(CONFIG_PPC) || defined(CONFIG_SUPERH32) 14 #include <asm/rtc.h> 15 16 static int generic_get_time(struct device *dev, struct rtc_time *tm) 17 { 18 unsigned int ret = get_rtc_time(tm); 19 20 if (ret & RTC_BATT_BAD) 21 return -EOPNOTSUPP; 22 23 return rtc_valid_tm(tm); 24 } 25 26 static int generic_set_time(struct device *dev, struct rtc_time *tm) 27 { 28 if (set_rtc_time(tm) < 0) 29 return -EOPNOTSUPP; 30 31 return 0; 32 } 33 34 static const struct rtc_class_ops generic_rtc_ops = { 35 .read_time = generic_get_time, 36 .set_time = generic_set_time, 37 }; 38 #else 39 #define generic_rtc_ops *(struct rtc_class_ops*)NULL 40 #endif 41 42 static int __init generic_rtc_probe(struct platform_device *dev) 43 { 44 struct rtc_device *rtc; 45 const struct rtc_class_ops *ops; 46 47 ops = dev_get_platdata(&dev->dev); 48 if (!ops) 49 ops = &generic_rtc_ops; 50 51 rtc = devm_rtc_device_register(&dev->dev, "rtc-generic", 52 ops, THIS_MODULE); 53 if (IS_ERR(rtc)) 54 return PTR_ERR(rtc); 55 56 platform_set_drvdata(dev, rtc); 57 58 return 0; 59 } 60 61 static struct platform_driver generic_rtc_driver = { 62 .driver = { 63 .name = "rtc-generic", 64 }, 65 }; 66 67 module_platform_driver_probe(generic_rtc_driver, generic_rtc_probe); 68 69 MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>"); 70 MODULE_LICENSE("GPL"); 71 MODULE_DESCRIPTION("Generic RTC driver"); 72 MODULE_ALIAS("platform:rtc-generic"); 73