diff options
| -rw-r--r-- | drivers/acpi/glue.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c index 7b6c9ff9beb..99500871e3f 100644 --- a/drivers/acpi/glue.c +++ b/drivers/acpi/glue.c @@ -241,3 +241,92 @@ static int __init init_acpi_device_notify(void) } arch_initcall(init_acpi_device_notify); + + +#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) + +/* 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). + */ +#include <linux/mc146818rtc.h> + +static struct cmos_rtc_board_info rtc_info; + + +#ifdef CONFIG_PNPACPI + +/* PNP devices are registered in a subsys_initcall(); + * ACPI specifies the PNP IDs to use. + */ +#include <linux/pnp.h> + +static int __init pnp_match(struct device *dev, void *data) +{ + static const char *ids[] = { "PNP0b00", "PNP0b01", "PNP0b02", }; + struct pnp_dev *pnp = to_pnp_dev(dev); + int i; + + for (i = 0; i < ARRAY_SIZE(ids); i++) { + if (compare_pnp_id(pnp->id, ids[i]) != 0) + return 1; + } + return 0; +} + +static struct device *__init get_rtc_dev(void) +{ + return bus_find_device(&pnp_bus_type, NULL, NULL, pnp_match); +} + +#else + +/* We expect non-PNPACPI platforms to register an RTC device, usually + * at or near arch_initcall(). That also helps for example PCs that + * aren't configured with ACPI (where this code wouldn't run, but the + * RTC would still be available). The device name matches the driver; + * that's how the platform bus works. + */ +#include <linux/platform_device.h> + +static int __init platform_match(struct device *dev, void *data) +{ + struct platform_device *pdev; + + pdev = container_of(dev, struct platform_device, dev); + return strcmp(pdev->name, "rtc_cmos") == 0; +} + +static struct device *__init get_rtc_dev(void) +{ + return bus_find_device(&platform_bus_type, NULL, NULL, platform_match); +} + +#endif + +static int __init acpi_rtc_init(void) +{ + struct device *dev = get_rtc_dev(); + + if (dev) { + rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm; + rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm; + rtc_info.rtc_century = acpi_gbl_FADT.century; + + /* NOTE: acpi_gbl_FADT->rtcs4 is NOT currently useful */ + + dev->platform_data = &rtc_info; + + /* RTC always wakes from S1/S2/S3, and often S4/STD */ + device_init_wakeup(dev, 1); + + put_device(dev); + } else + pr_debug("ACPI: RTC unavailable?\n"); + return 0; +} +/* do this between RTC subsys_initcall() and rtc_cmos driver_initcall() */ +fs_initcall(acpi_rtc_init); + +#endif |