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path: root/drivers/rtc/rtc-cmos.c
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Diffstat (limited to 'drivers/rtc/rtc-cmos.c')
-rw-r--r--drivers/rtc/rtc-cmos.c127
1 files changed, 110 insertions, 17 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index b184367637d0..963ad0b6a4e9 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -636,7 +636,7 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
*/
#if defined(CONFIG_ATARI)
address_space = 64;
-#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__)
+#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__sparc__)
address_space = 128;
#else
#warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes.
@@ -699,7 +699,8 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
/* FIXME teach the alarm code how to handle binary mode;
* <asm-generic/rtc.h> doesn't know 12-hour mode either.
*/
- if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY))) {
+ if (is_valid_irq(rtc_irq) &&
+ (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY)))) {
dev_dbg(dev, "only 24-hr BCD mode supported\n");
retval = -ENXIO;
goto cleanup1;
@@ -912,6 +913,92 @@ static inline int cmos_poweroff(struct device *dev)
* predate even PNPBIOS should set up platform_bus devices.
*/
+#ifdef CONFIG_ACPI
+
+#include <linux/acpi.h>
+
+#ifdef CONFIG_PM
+static u32 rtc_handler(void *context)
+{
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+ return ACPI_INTERRUPT_HANDLED;
+}
+
+static inline void rtc_wake_setup(void)
+{
+ acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
+ /*
+ * After the RTC handler is installed, the Fixed_RTC event should
+ * be disabled. Only when the RTC alarm is set will it be enabled.
+ */
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void rtc_wake_on(struct device *dev)
+{
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_enable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void rtc_wake_off(struct device *dev)
+{
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+#else
+#define rtc_wake_setup() do{}while(0)
+#define rtc_wake_on NULL
+#define rtc_wake_off NULL
+#endif
+
+/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
+ * its device node and pass extra config data. This helps its driver use
+ * capabilities that the now-obsolete mc146818 didn't have, and informs it
+ * that this board's RTC is wakeup-capable (per ACPI spec).
+ */
+static struct cmos_rtc_board_info acpi_rtc_info;
+
+static void __devinit
+cmos_wake_setup(struct device *dev)
+{
+ if (acpi_disabled)
+ return;
+
+ rtc_wake_setup();
+ acpi_rtc_info.wake_on = rtc_wake_on;
+ acpi_rtc_info.wake_off = rtc_wake_off;
+
+ /* workaround bug in some ACPI tables */
+ if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) {
+ dev_dbg(dev, "bogus FADT month_alarm (%d)\n",
+ acpi_gbl_FADT.month_alarm);
+ acpi_gbl_FADT.month_alarm = 0;
+ }
+
+ acpi_rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
+ acpi_rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
+ acpi_rtc_info.rtc_century = acpi_gbl_FADT.century;
+
+ /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */
+ if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
+ dev_info(dev, "RTC can wake from S4\n");
+
+ dev->platform_data = &acpi_rtc_info;
+
+ /* RTC always wakes from S1/S2/S3, and often S4/STD */
+ device_init_wakeup(dev, 1);
+}
+
+#else
+
+static void __devinit
+cmos_wake_setup(struct device *dev)
+{
+}
+
+#endif
+
#ifdef CONFIG_PNP
#include <linux/pnp.h>
@@ -919,6 +1006,8 @@ static inline int cmos_poweroff(struct device *dev)
static int __devinit
cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
{
+ cmos_wake_setup(&pnp->dev);
+
if (pnp_port_start(pnp,0) == 0x70 && !pnp_irq_valid(pnp,0))
/* Some machines contain a PNP entry for the RTC, but
* don't define the IRQ. It should always be safe to
@@ -996,6 +1085,7 @@ static struct pnp_driver cmos_pnp_driver = {
static int __init cmos_platform_probe(struct platform_device *pdev)
{
+ cmos_wake_setup(&pdev->dev);
return cmos_do_probe(&pdev->dev,
platform_get_resource(pdev, IORESOURCE_IO, 0),
platform_get_irq(pdev, 0));
@@ -1030,29 +1120,32 @@ static struct platform_driver cmos_platform_driver = {
static int __init cmos_init(void)
{
+ int retval = 0;
+
#ifdef CONFIG_PNP
- if (pnp_platform_devices)
- return pnp_register_driver(&cmos_pnp_driver);
- else
- return platform_driver_probe(&cmos_platform_driver,
- cmos_platform_probe);
-#else
- return platform_driver_probe(&cmos_platform_driver,
- cmos_platform_probe);
-#endif /* CONFIG_PNP */
+ pnp_register_driver(&cmos_pnp_driver);
+#endif
+
+ if (!cmos_rtc.dev)
+ retval = platform_driver_probe(&cmos_platform_driver,
+ cmos_platform_probe);
+
+ if (retval == 0)
+ return 0;
+
+#ifdef CONFIG_PNP
+ pnp_unregister_driver(&cmos_pnp_driver);
+#endif
+ return retval;
}
module_init(cmos_init);
static void __exit cmos_exit(void)
{
#ifdef CONFIG_PNP
- if (pnp_platform_devices)
- pnp_unregister_driver(&cmos_pnp_driver);
- else
- platform_driver_unregister(&cmos_platform_driver);
-#else
+ pnp_unregister_driver(&cmos_pnp_driver);
+#endif
platform_driver_unregister(&cmos_platform_driver);
-#endif /* CONFIG_PNP */
}
module_exit(cmos_exit);