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 14static 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 24static 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 32static const struct rtc_class_ops generic_rtc_ops = { 33 .read_time = generic_get_time, 34 .set_time = generic_set_time, 35}; 36 37static int __init generic_rtc_probe(struct platform_device *dev) 38{ 39 struct rtc_device *rtc; 40 41 rtc = rtc_device_register("rtc-generic", &dev->dev, &generic_rtc_ops, 42 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 51static int __exit generic_rtc_remove(struct platform_device *dev) 52{ 53 struct rtc_device *rtc = platform_get_drvdata(dev); 54 55 rtc_device_unregister(rtc); 56 57 return 0; 58} 59 60static struct platform_driver generic_rtc_driver = { 61 .driver = { 62 .name = "rtc-generic", 63 .owner = THIS_MODULE, 64 }, 65 .remove = __exit_p(generic_rtc_remove), 66}; 67 68static int __init generic_rtc_init(void) 69{ 70 return platform_driver_probe(&generic_rtc_driver, generic_rtc_probe); 71} 72 73static void __exit generic_rtc_fini(void) 74{ 75 platform_driver_unregister(&generic_rtc_driver); 76} 77 78module_init(generic_rtc_init); 79module_exit(generic_rtc_fini); 80 81MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>"); 82MODULE_LICENSE("GPL"); 83MODULE_DESCRIPTION("Generic RTC driver"); 84MODULE_ALIAS("platform:rtc-generic"); 85