| Geert Uytterhoeven | 3afe6d0 | 2009-02-19 16:46:49 +0100 | [diff] [blame] | 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 = 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 | |
| 51 | static 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 | |
| 60 | static 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 | |
| 68 | static int __init generic_rtc_init(void) |
| 69 | { |
| 70 | return platform_driver_probe(&generic_rtc_driver, generic_rtc_probe); |
| 71 | } |
| 72 | |
| 73 | static void __exit generic_rtc_fini(void) |
| 74 | { |
| 75 | platform_driver_unregister(&generic_rtc_driver); |
| 76 | } |
| 77 | |
| 78 | module_init(generic_rtc_init); |
| 79 | module_exit(generic_rtc_fini); |
| 80 | |
| 81 | MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>"); |
| 82 | MODULE_LICENSE("GPL"); |
| 83 | MODULE_DESCRIPTION("Generic RTC driver"); |
| 84 | MODULE_ALIAS("platform:rtc-generic"); |