diff options
Diffstat (limited to 'drivers/rtc/rtc-cmos.c')
| -rw-r--r-- | drivers/rtc/rtc-cmos.c | 125 |
1 files changed, 59 insertions, 66 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index a82556a07..8f7034ba7 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -41,7 +41,6 @@ #include <linux/pm.h> #include <linux/of.h> #include <linux/of_platform.h> -#include <linux/dmi.h> /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */ #include <asm-generic/rtc.h> @@ -51,6 +50,7 @@ struct cmos_rtc { struct device *dev; int irq; struct resource *iomem; + time64_t alarm_expires; void (*wake_on)(struct device *); void (*wake_off)(struct device *); @@ -377,53 +377,11 @@ static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) spin_unlock_irq(&rtc_lock); - return 0; -} - -/* - * Do not disable RTC alarm on shutdown - workaround for b0rked BIOSes. - */ -static bool alarm_disable_quirk; + cmos->alarm_expires = rtc_tm_to_time64(&t->time); -static int __init set_alarm_disable_quirk(const struct dmi_system_id *id) -{ - alarm_disable_quirk = true; - pr_info("BIOS has alarm-disable quirk - RTC alarms disabled\n"); return 0; } -static const struct dmi_system_id rtc_quirks[] __initconst = { - /* https://bugzilla.novell.com/show_bug.cgi?id=805740 */ - { - .callback = set_alarm_disable_quirk, - .ident = "IBM Truman", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), - DMI_MATCH(DMI_PRODUCT_NAME, "4852570"), - }, - }, - /* https://bugzilla.novell.com/show_bug.cgi?id=812592 */ - { - .callback = set_alarm_disable_quirk, - .ident = "Gigabyte GA-990XA-UD3", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, - "Gigabyte Technology Co., Ltd."), - DMI_MATCH(DMI_PRODUCT_NAME, "GA-990XA-UD3"), - }, - }, - /* http://permalink.gmane.org/gmane.linux.kernel/1604474 */ - { - .callback = set_alarm_disable_quirk, - .ident = "Toshiba Satellite L300", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), - DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L300"), - }, - }, - {} -}; - static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct cmos_rtc *cmos = dev_get_drvdata(dev); @@ -432,9 +390,6 @@ static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled) if (!is_valid_irq(cmos->irq)) return -EINVAL; - if (alarm_disable_quirk) - return 0; - spin_lock_irqsave(&rtc_lock, flags); if (enabled) @@ -512,13 +467,6 @@ cmos_nvram_read(struct file *filp, struct kobject *kobj, { int retval; - if (unlikely(off >= attr->size)) - return 0; - if (unlikely(off < 0)) - return -EINVAL; - if ((off + count) > attr->size) - count = attr->size - off; - off += NVRAM_OFFSET; spin_lock_irq(&rtc_lock); for (retval = 0; count; count--, off++, retval++) { @@ -543,12 +491,6 @@ cmos_nvram_write(struct file *filp, struct kobject *kobj, int retval; cmos = dev_get_drvdata(container_of(kobj, struct device, kobj)); - if (unlikely(off >= attr->size)) - return -EFBIG; - if (unlikely(off < 0)) - return -EINVAL; - if ((off + count) > attr->size) - count = attr->size - off; /* NOTE: on at least PCs and Ataris, the boot firmware uses a * checksum on part of the NVRAM data. That's currently ignored @@ -860,6 +802,51 @@ static void __exit cmos_do_remove(struct device *dev) cmos->dev = NULL; } +static int cmos_aie_poweroff(struct device *dev) +{ + struct cmos_rtc *cmos = dev_get_drvdata(dev); + struct rtc_time now; + time64_t t_now; + int retval = 0; + unsigned char rtc_control; + + if (!cmos->alarm_expires) + return -EINVAL; + + spin_lock_irq(&rtc_lock); + rtc_control = CMOS_READ(RTC_CONTROL); + spin_unlock_irq(&rtc_lock); + + /* We only care about the situation where AIE is disabled. */ + if (rtc_control & RTC_AIE) + return -EBUSY; + + cmos_read_time(dev, &now); + t_now = rtc_tm_to_time64(&now); + + /* + * When enabling "RTC wake-up" in BIOS setup, the machine reboots + * automatically right after shutdown on some buggy boxes. + * This automatic rebooting issue won't happen when the alarm + * time is larger than now+1 seconds. + * + * If the alarm time is equal to now+1 seconds, the issue can be + * prevented by cancelling the alarm. + */ + if (cmos->alarm_expires == t_now + 1) { + struct rtc_wkalrm alarm; + + /* Cancel the AIE timer by configuring the past time. */ + rtc_time64_to_tm(t_now - 1, &alarm.time); + alarm.enabled = 0; + retval = cmos_set_alarm(dev, &alarm); + } else if (cmos->alarm_expires > t_now + 1) { + retval = -EBUSY; + } + + return retval; +} + #ifdef CONFIG_PM static int cmos_suspend(struct device *dev) @@ -1094,8 +1081,12 @@ static void cmos_pnp_shutdown(struct pnp_dev *pnp) struct device *dev = &pnp->dev; struct cmos_rtc *cmos = dev_get_drvdata(dev); - if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(dev)) - return; + if (system_state == SYSTEM_POWER_OFF) { + int retval = cmos_poweroff(dev); + + if (cmos_aie_poweroff(dev) < 0 && !retval) + return; + } cmos_do_shutdown(cmos->irq); } @@ -1200,8 +1191,12 @@ static void cmos_platform_shutdown(struct platform_device *pdev) struct device *dev = &pdev->dev; struct cmos_rtc *cmos = dev_get_drvdata(dev); - if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(dev)) - return; + if (system_state == SYSTEM_POWER_OFF) { + int retval = cmos_poweroff(dev); + + if (cmos_aie_poweroff(dev) < 0 && !retval) + return; + } cmos_do_shutdown(cmos->irq); } @@ -1243,8 +1238,6 @@ static int __init cmos_init(void) platform_driver_registered = true; } - dmi_check_system(rtc_quirks); - if (retval == 0) return 0; |