| Kyle McMartin | 9eb1686 | 2008-09-10 14:24:07 +0000 | [diff] [blame] | 1 | /* rtc-parisc: RTC for HP PA-RISC firmware |
| 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 | |
| 11 | #include <asm/rtc.h> |
| 12 | |
| 13 | /* as simple as can be, and no simpler. */ |
| 14 | struct parisc_rtc { |
| 15 | struct rtc_device *rtc; |
| 16 | spinlock_t lock; |
| 17 | }; |
| 18 | |
| 19 | static int parisc_get_time(struct device *dev, struct rtc_time *tm) |
| 20 | { |
| 21 | struct parisc_rtc *p = dev_get_drvdata(dev); |
| 22 | unsigned long flags, ret; |
| 23 | |
| 24 | spin_lock_irqsave(&p->lock, flags); |
| 25 | ret = get_rtc_time(tm); |
| 26 | spin_unlock_irqrestore(&p->lock, flags); |
| 27 | |
| 28 | if (ret & RTC_BATT_BAD) |
| 29 | return -EOPNOTSUPP; |
| 30 | |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | static int parisc_set_time(struct device *dev, struct rtc_time *tm) |
| 35 | { |
| 36 | struct parisc_rtc *p = dev_get_drvdata(dev); |
| 37 | unsigned long flags, ret; |
| 38 | |
| 39 | spin_lock_irqsave(&p->lock, flags); |
| 40 | ret = set_rtc_time(tm); |
| 41 | spin_unlock_irqrestore(&p->lock, flags); |
| 42 | |
| 43 | if (ret < 0) |
| 44 | return -EOPNOTSUPP; |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | static const struct rtc_class_ops parisc_rtc_ops = { |
| 50 | .read_time = parisc_get_time, |
| 51 | .set_time = parisc_set_time, |
| 52 | }; |
| 53 | |
| 54 | static int __devinit parisc_rtc_probe(struct platform_device *dev) |
| 55 | { |
| 56 | struct parisc_rtc *p; |
| 57 | |
| 58 | p = kzalloc(sizeof (*p), GFP_KERNEL); |
| 59 | if (!p) |
| 60 | return -ENOMEM; |
| 61 | |
| 62 | spin_lock_init(&p->lock); |
| 63 | |
| 64 | p->rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops, |
| 65 | THIS_MODULE); |
| 66 | if (IS_ERR(p->rtc)) { |
| 67 | int err = PTR_ERR(p->rtc); |
| 68 | kfree(p); |
| 69 | return err; |
| 70 | } |
| 71 | |
| 72 | platform_set_drvdata(dev, p); |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static int __devexit parisc_rtc_remove(struct platform_device *dev) |
| 78 | { |
| 79 | struct parisc_rtc *p = platform_get_drvdata(dev); |
| 80 | |
| 81 | rtc_device_unregister(p->rtc); |
| 82 | kfree(p); |
| 83 | |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static struct platform_driver parisc_rtc_driver = { |
| 88 | .driver = { |
| 89 | .name = "rtc-parisc", |
| 90 | .owner = THIS_MODULE, |
| 91 | }, |
| 92 | .probe = parisc_rtc_probe, |
| 93 | .remove = __devexit_p(parisc_rtc_remove), |
| 94 | }; |
| 95 | |
| 96 | static int __init parisc_rtc_init(void) |
| 97 | { |
| 98 | return platform_driver_register(&parisc_rtc_driver); |
| 99 | } |
| 100 | |
| 101 | static void __exit parisc_rtc_fini(void) |
| 102 | { |
| 103 | platform_driver_unregister(&parisc_rtc_driver); |
| 104 | } |
| 105 | |
| 106 | module_init(parisc_rtc_init); |
| 107 | module_exit(parisc_rtc_fini); |
| 108 | |
| 109 | MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>"); |
| 110 | MODULE_LICENSE("GPL"); |
| 111 | MODULE_DESCRIPTION("HP PA-RISC RTC driver"); |