1/* rtc-starfire.c: Starfire platform RTC driver. 2 * 3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net> 4 */ 5 6#include <linux/kernel.h> 7#include <linux/module.h> 8#include <linux/init.h> 9#include <linux/rtc.h> 10#include <linux/platform_device.h> 11 12#include <asm/oplib.h> 13 14MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 15MODULE_DESCRIPTION("Starfire RTC driver"); 16MODULE_LICENSE("GPL"); 17 18static u32 starfire_get_time(void) 19{ 20 static char obp_gettod[32]; 21 static u32 unix_tod; 22 23 sprintf(obp_gettod, "h# %08x unix-gettod", 24 (unsigned int) (long) &unix_tod); 25 prom_feval(obp_gettod); 26 27 return unix_tod; 28} 29 30static int starfire_read_time(struct device *dev, struct rtc_time *tm) 31{ 32 rtc_time_to_tm(starfire_get_time(), tm); 33 return rtc_valid_tm(tm); 34} 35 36static const struct rtc_class_ops starfire_rtc_ops = { 37 .read_time = starfire_read_time, 38}; 39 40static int __init starfire_rtc_probe(struct platform_device *pdev) 41{ 42 struct rtc_device *rtc = rtc_device_register("starfire", &pdev->dev, 43 &starfire_rtc_ops, THIS_MODULE); 44 if (IS_ERR(rtc)) 45 return PTR_ERR(rtc); 46 47 platform_set_drvdata(pdev, rtc); 48 49 return 0; 50} 51 52static int __exit starfire_rtc_remove(struct platform_device *pdev) 53{ 54 struct rtc_device *rtc = platform_get_drvdata(pdev); 55 56 rtc_device_unregister(rtc); 57 58 return 0; 59} 60 61static struct platform_driver starfire_rtc_driver = { 62 .driver = { 63 .name = "rtc-starfire", 64 .owner = THIS_MODULE, 65 }, 66 .remove = __exit_p(starfire_rtc_remove), 67}; 68 69static int __init starfire_rtc_init(void) 70{ 71 return platform_driver_probe(&starfire_rtc_driver, starfire_rtc_probe); 72} 73 74static void __exit starfire_rtc_exit(void) 75{ 76 platform_driver_unregister(&starfire_rtc_driver); 77} 78 79module_init(starfire_rtc_init); 80module_exit(starfire_rtc_exit); 81