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 14 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 15 MODULE_DESCRIPTION("Starfire RTC driver"); 16 MODULE_LICENSE("GPL"); 17 18 static 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 30 static 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 36 static const struct rtc_class_ops starfire_rtc_ops = { 37 .read_time = starfire_read_time, 38 }; 39 40 static 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 52 static 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 61 static 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 69 static int __init starfire_rtc_init(void) 70 { 71 return platform_driver_probe(&starfire_rtc_driver, starfire_rtc_probe); 72 } 73 74 static void __exit starfire_rtc_exit(void) 75 { 76 platform_driver_unregister(&starfire_rtc_driver); 77 } 78 79 module_init(starfire_rtc_init); 80 module_exit(starfire_rtc_exit); 81