projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| de2cf332 DM |
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/time.h> | |
| 10 | #include <linux/rtc.h> | |
| 11 | #include <linux/platform_device.h> | |
| 12 | ||
| 13 | #include <asm/oplib.h> | |
| 14 | ||
| 15 | MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); | |
| 16 | MODULE_DESCRIPTION("Starfire RTC driver"); | |
| 17 | MODULE_LICENSE("GPL"); | |
| 18 | ||
| 19 | struct starfire_rtc { | |
| 20 | struct rtc_device *rtc; | |
| 21 | spinlock_t lock; | |
| 22 | }; | |
| 23 | ||
| 24 | static u32 starfire_get_time(void) | |
| 25 | { | |
| 26 | static char obp_gettod[32]; | |
| 27 | static u32 unix_tod; | |
| 28 | ||
| 29 | sprintf(obp_gettod, "h# %08x unix-gettod", | |
| 30 | (unsigned int) (long) &unix_tod); | |
| 31 | prom_feval(obp_gettod); | |
| 32 | ||
| 33 | return unix_tod; | |
| 34 | } | |
| 35 | ||
| 36 | static int starfire_read_time(struct device *dev, struct rtc_time *tm) | |
| 37 | { | |
| 38 | struct starfire_rtc *p = dev_get_drvdata(dev); | |
| 39 | unsigned long flags, secs; | |
| 40 | ||
| 41 | spin_lock_irqsave(&p->lock, flags); | |
| 42 | secs = starfire_get_time(); | |
| 43 | spin_unlock_irqrestore(&p->lock, flags); | |
| 44 | ||
| 45 | rtc_time_to_tm(secs, tm); | |
| 46 | ||
| 47 | return 0; | |
| 48 | } | |
| 49 | ||
| 50 | static int starfire_set_time(struct device *dev, struct rtc_time *tm) | |
| 51 | { | |
| 52 | unsigned long secs; | |
| 53 | int err; | |
| 54 | ||
| 55 | err = rtc_tm_to_time(tm, &secs); | |
| 56 | if (err) | |
| 57 | return err; | |
| 58 | ||
| 59 | /* Do nothing, time is set using the service processor | |
| 60 | * console on this platform. | |
| 61 | */ | |
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | static const struct rtc_class_ops starfire_rtc_ops = { | |
| 66 | .read_time = starfire_read_time, | |
| 67 | .set_time = starfire_set_time, | |
| 68 | }; | |
| 69 | ||
| 70 | static int __devinit starfire_rtc_probe(struct platform_device *pdev) | |
| 71 | { | |
| 72 | struct starfire_rtc *p = kzalloc(sizeof(*p), GFP_KERNEL); | |
| 73 | ||
| 74 | if (!p) | |
| 75 | return -ENOMEM; | |
| 76 | ||
| 77 | spin_lock_init(&p->lock); | |
| 78 | ||
| 79 | p->rtc = rtc_device_register("starfire", &pdev->dev, | |
| 80 | &starfire_rtc_ops, THIS_MODULE); | |
| 81 | if (IS_ERR(p->rtc)) { | |
| 82 | int err = PTR_ERR(p->rtc); | |
| 83 | kfree(p); | |
| 84 | return err; | |
| 85 | } | |
| 86 | platform_set_drvdata(pdev, p); | |
| 87 | return 0; | |
| 88 | } | |
| 89 | ||
| 90 | static int __devexit starfire_rtc_remove(struct platform_device *pdev) | |
| 91 | { | |
| 92 | struct starfire_rtc *p = platform_get_drvdata(pdev); | |
| 93 | ||
| 94 | rtc_device_unregister(p->rtc); | |
| 95 | kfree(p); | |
| 96 | ||
| 97 | return 0; | |
| 98 | } | |
| 99 | ||
| 100 | static struct platform_driver starfire_rtc_driver = { | |
| 101 | .driver = { | |
| 102 | .name = "rtc-starfire", | |
| 103 | .owner = THIS_MODULE, | |
| 104 | }, | |
| 105 | .probe = starfire_rtc_probe, | |
| 106 | .remove = __devexit_p(starfire_rtc_remove), | |
| 107 | }; | |
| 108 | ||
| 109 | static int __init starfire_rtc_init(void) | |
| 110 | { | |
| 111 | return platform_driver_register(&starfire_rtc_driver); | |
| 112 | } | |
| 113 | ||
| 114 | static void __exit starfire_rtc_exit(void) | |
| 115 | { | |
| 116 | platform_driver_unregister(&starfire_rtc_driver); | |
| 117 | } | |
| 118 | ||
| 119 | module_init(starfire_rtc_init); | |
| 120 | module_exit(starfire_rtc_exit); |