ACPI: updates rtc-cmos device platform_data
Update ACPI to export its RTC extension information through platform_data to the PNPACPI or platform bus device node used on the system being set up. This will need to be updated later to provide a firmware hook to handle system suspend with an alarm pending. Len notes that "Eventually we may bundle ACPI/PNP/PNPACPI..." but if/when that happens, ACPI can simplify this without my help. And until it does, the separate patch creating a platform_device (on all X86_PC systems, even without ACPI) will be needed. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -241,3 +241,92 @@ static int __init init_acpi_device_notify(void)
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}
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arch_initcall(init_acpi_device_notify);
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#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
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/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
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* its device node and pass extra config data. This helps its driver use
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* capabilities that the now-obsolete mc146818 didn't have, and informs it
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* that this board's RTC is wakeup-capable (per ACPI spec).
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*/
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#include <linux/mc146818rtc.h>
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static struct cmos_rtc_board_info rtc_info;
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#ifdef CONFIG_PNPACPI
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/* PNP devices are registered in a subsys_initcall();
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* ACPI specifies the PNP IDs to use.
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*/
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#include <linux/pnp.h>
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static int __init pnp_match(struct device *dev, void *data)
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{
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static const char *ids[] = { "PNP0b00", "PNP0b01", "PNP0b02", };
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struct pnp_dev *pnp = to_pnp_dev(dev);
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int i;
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for (i = 0; i < ARRAY_SIZE(ids); i++) {
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if (compare_pnp_id(pnp->id, ids[i]) != 0)
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return 1;
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}
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return 0;
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}
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static struct device *__init get_rtc_dev(void)
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{
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return bus_find_device(&pnp_bus_type, NULL, NULL, pnp_match);
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}
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#else
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/* We expect non-PNPACPI platforms to register an RTC device, usually
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* at or near arch_initcall(). That also helps for example PCs that
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* aren't configured with ACPI (where this code wouldn't run, but the
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* RTC would still be available). The device name matches the driver;
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* that's how the platform bus works.
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*/
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#include <linux/platform_device.h>
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static int __init platform_match(struct device *dev, void *data)
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{
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struct platform_device *pdev;
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pdev = container_of(dev, struct platform_device, dev);
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return strcmp(pdev->name, "rtc_cmos") == 0;
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}
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static struct device *__init get_rtc_dev(void)
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{
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return bus_find_device(&platform_bus_type, NULL, NULL, platform_match);
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}
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#endif
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static int __init acpi_rtc_init(void)
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{
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struct device *dev = get_rtc_dev();
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if (dev) {
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rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
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rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
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rtc_info.rtc_century = acpi_gbl_FADT.century;
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/* NOTE: acpi_gbl_FADT->rtcs4 is NOT currently useful */
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dev->platform_data = &rtc_info;
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/* RTC always wakes from S1/S2/S3, and often S4/STD */
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device_init_wakeup(dev, 1);
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put_device(dev);
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} else
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pr_debug("ACPI: RTC unavailable?\n");
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return 0;
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}
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/* do this between RTC subsys_initcall() and rtc_cmos driver_initcall() */
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fs_initcall(acpi_rtc_init);
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#endif
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