diff options
Diffstat (limited to 'drivers/rtc/rtc-cmos.c')
| -rw-r--r-- | drivers/rtc/rtc-cmos.c | 97 |
1 files changed, 87 insertions, 10 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index dd3d59806ffa..f4a96dbdabf2 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -191,6 +191,13 @@ static inline void cmos_write_bank2(unsigned char val, unsigned char addr) static int cmos_read_time(struct device *dev, struct rtc_time *t) { + /* + * If pm_trace abused the RTC for storage, set the timespec to 0, + * which tells the caller that this RTC value is unusable. + */ + if (!pm_trace_rtc_valid()) + return -EIO; + /* REVISIT: if the clock has a "century" register, use * that instead of the heuristic in mc146818_get_time(). * That'll make Y3K compatility (year > 2070) easy! @@ -325,14 +332,86 @@ static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask) cmos_checkintr(cmos, rtc_control); } +static int cmos_validate_alarm(struct device *dev, struct rtc_wkalrm *t) +{ + struct cmos_rtc *cmos = dev_get_drvdata(dev); + struct rtc_time now; + + cmos_read_time(dev, &now); + + if (!cmos->day_alrm) { + time64_t t_max_date; + time64_t t_alrm; + + t_max_date = rtc_tm_to_time64(&now); + t_max_date += 24 * 60 * 60 - 1; + t_alrm = rtc_tm_to_time64(&t->time); + if (t_alrm > t_max_date) { + dev_err(dev, + "Alarms can be up to one day in the future\n"); + return -EINVAL; + } + } else if (!cmos->mon_alrm) { + struct rtc_time max_date = now; + time64_t t_max_date; + time64_t t_alrm; + int max_mday; + + if (max_date.tm_mon == 11) { + max_date.tm_mon = 0; + max_date.tm_year += 1; + } else { + max_date.tm_mon += 1; + } + max_mday = rtc_month_days(max_date.tm_mon, max_date.tm_year); + if (max_date.tm_mday > max_mday) + max_date.tm_mday = max_mday; + + t_max_date = rtc_tm_to_time64(&max_date); + t_max_date -= 1; + t_alrm = rtc_tm_to_time64(&t->time); + if (t_alrm > t_max_date) { + dev_err(dev, + "Alarms can be up to one month in the future\n"); + return -EINVAL; + } + } else { + struct rtc_time max_date = now; + time64_t t_max_date; + time64_t t_alrm; + int max_mday; + + max_date.tm_year += 1; + max_mday = rtc_month_days(max_date.tm_mon, max_date.tm_year); + if (max_date.tm_mday > max_mday) + max_date.tm_mday = max_mday; + + t_max_date = rtc_tm_to_time64(&max_date); + t_max_date -= 1; + t_alrm = rtc_tm_to_time64(&t->time); + if (t_alrm > t_max_date) { + dev_err(dev, + "Alarms can be up to one year in the future\n"); + return -EINVAL; + } + } + + return 0; +} + static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) { struct cmos_rtc *cmos = dev_get_drvdata(dev); unsigned char mon, mday, hrs, min, sec, rtc_control; + int ret; if (!is_valid_irq(cmos->irq)) return -EIO; + ret = cmos_validate_alarm(dev, t); + if (ret < 0) + return ret; + mon = t->time.tm_mon + 1; mday = t->time.tm_mday; hrs = t->time.tm_hour; @@ -700,9 +779,6 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) spin_unlock_irq(&rtc_lock); - /* FIXME: - * <asm-generic/rtc.h> doesn't know 12-hour mode either. - */ if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) { dev_warn(dev, "only 24-hr supported\n"); retval = -ENXIO; @@ -776,7 +852,7 @@ static void cmos_do_shutdown(int rtc_irq) spin_unlock_irq(&rtc_lock); } -static void __exit cmos_do_remove(struct device *dev) +static void cmos_do_remove(struct device *dev) { struct cmos_rtc *cmos = dev_get_drvdata(dev); struct resource *ports; @@ -996,8 +1072,9 @@ static u32 rtc_handler(void *context) struct cmos_rtc *cmos = dev_get_drvdata(dev); unsigned char rtc_control = 0; unsigned char rtc_intr; + unsigned long flags; - spin_lock_irq(&rtc_lock); + spin_lock_irqsave(&rtc_lock, flags); if (cmos_rtc.suspend_ctrl) rtc_control = CMOS_READ(RTC_CONTROL); if (rtc_control & RTC_AIE) { @@ -1006,7 +1083,7 @@ static u32 rtc_handler(void *context) rtc_intr = CMOS_READ(RTC_INTR_FLAGS); rtc_update_irq(cmos->rtc, 1, rtc_intr); } - spin_unlock_irq(&rtc_lock); + spin_unlock_irqrestore(&rtc_lock, flags); pm_wakeup_event(dev, 0); acpi_clear_event(ACPI_EVENT_RTC); @@ -1129,7 +1206,7 @@ static int cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) pnp_irq(pnp, 0)); } -static void __exit cmos_pnp_remove(struct pnp_dev *pnp) +static void cmos_pnp_remove(struct pnp_dev *pnp) { cmos_do_remove(&pnp->dev); } @@ -1161,7 +1238,7 @@ static struct pnp_driver cmos_pnp_driver = { .name = (char *) driver_name, .id_table = rtc_ids, .probe = cmos_pnp_probe, - .remove = __exit_p(cmos_pnp_remove), + .remove = cmos_pnp_remove, .shutdown = cmos_pnp_shutdown, /* flag ensures resume() gets called, and stops syslog spam */ @@ -1238,7 +1315,7 @@ static int __init cmos_platform_probe(struct platform_device *pdev) return cmos_do_probe(&pdev->dev, resource, irq); } -static int __exit cmos_platform_remove(struct platform_device *pdev) +static int cmos_platform_remove(struct platform_device *pdev) { cmos_do_remove(&pdev->dev); return 0; @@ -1263,7 +1340,7 @@ static void cmos_platform_shutdown(struct platform_device *pdev) MODULE_ALIAS("platform:rtc_cmos"); static struct platform_driver cmos_platform_driver = { - .remove = __exit_p(cmos_platform_remove), + .remove = cmos_platform_remove, .shutdown = cmos_platform_shutdown, .driver = { .name = driver_name, |
