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-rw-r--r--drivers/acpi/glue.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 7b6c9ff9bebe..99500871e3fe 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -241,3 +241,92 @@ static int __init init_acpi_device_notify(void)
241} 241}
242 242
243arch_initcall(init_acpi_device_notify); 243arch_initcall(init_acpi_device_notify);
244
245
246#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
247
248/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
249 * its device node and pass extra config data. This helps its driver use
250 * capabilities that the now-obsolete mc146818 didn't have, and informs it
251 * that this board's RTC is wakeup-capable (per ACPI spec).
252 */
253#include <linux/mc146818rtc.h>
254
255static struct cmos_rtc_board_info rtc_info;
256
257
258#ifdef CONFIG_PNPACPI
259
260/* PNP devices are registered in a subsys_initcall();
261 * ACPI specifies the PNP IDs to use.
262 */
263#include <linux/pnp.h>
264
265static int __init pnp_match(struct device *dev, void *data)
266{
267 static const char *ids[] = { "PNP0b00", "PNP0b01", "PNP0b02", };
268 struct pnp_dev *pnp = to_pnp_dev(dev);
269 int i;
270
271 for (i = 0; i < ARRAY_SIZE(ids); i++) {
272 if (compare_pnp_id(pnp->id, ids[i]) != 0)
273 return 1;
274 }
275 return 0;
276}
277
278static struct device *__init get_rtc_dev(void)
279{
280 return bus_find_device(&pnp_bus_type, NULL, NULL, pnp_match);
281}
282
283#else
284
285/* We expect non-PNPACPI platforms to register an RTC device, usually
286 * at or near arch_initcall(). That also helps for example PCs that
287 * aren't configured with ACPI (where this code wouldn't run, but the
288 * RTC would still be available). The device name matches the driver;
289 * that's how the platform bus works.
290 */
291#include <linux/platform_device.h>
292
293static int __init platform_match(struct device *dev, void *data)
294{
295 struct platform_device *pdev;
296
297 pdev = container_of(dev, struct platform_device, dev);
298 return strcmp(pdev->name, "rtc_cmos") == 0;
299}
300
301static struct device *__init get_rtc_dev(void)
302{
303 return bus_find_device(&platform_bus_type, NULL, NULL, platform_match);
304}
305
306#endif
307
308static int __init acpi_rtc_init(void)
309{
310 struct device *dev = get_rtc_dev();
311
312 if (dev) {
313 rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
314 rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
315 rtc_info.rtc_century = acpi_gbl_FADT.century;
316
317 /* NOTE: acpi_gbl_FADT->rtcs4 is NOT currently useful */
318
319 dev->platform_data = &rtc_info;
320
321 /* RTC always wakes from S1/S2/S3, and often S4/STD */
322 device_init_wakeup(dev, 1);
323
324 put_device(dev);
325 } else
326 pr_debug("ACPI: RTC unavailable?\n");
327 return 0;
328}
329/* do this between RTC subsys_initcall() and rtc_cmos driver_initcall() */
330fs_initcall(acpi_rtc_init);
331
332#endif