rtc-cmos: Add an alarm disable quirk

[~andy/linux] / drivers / rtc / rtc-cmos.c

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index f14876256a4a5d242695746355149703ed743003..a2325bc5e497e7dbee4c72ac805da1c324ae4d27 100644 (file)
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -34,11 +34,11 @@
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
-#include <linux/mod_devicetable.h>
 #include <linux/log2.h>
 #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>
@@ -377,6 +377,51 @@ static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
        return 0;
 }
 
+/*
+ * Do not disable RTC alarm on shutdown - workaround for b0rked BIOSes.
+ */
+static bool alarm_disable_quirk;
+
+static int __init set_alarm_disable_quirk(const struct dmi_system_id *id)
+{
+       alarm_disable_quirk = true;
+       pr_info("rtc-cmos: BIOS has alarm-disable quirk. ");
+       pr_info("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);
@@ -385,6 +430,9 @@ 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)
@@ -1157,6 +1205,8 @@ static int __init cmos_init(void)
                        platform_driver_registered = true;
        }
 
+       dmi_check_system(rtc_quirks);
+
        if (retval == 0)
                return 0;