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provide rtc_cmos platform device 

Recently (around 2.6.25) I've noticed that RTC no longer works for me.  It
turned out this is because I use pnpacpi=off kernel option to work around
the parport_pc bugs.  I always did so, but RTC used to work fine in the
past, and now it have regressed.

The patch fixes the problem by creating the platform device for the RTC
when PNP is disabled.  This may also help running the PNP-enabled kernel
on an older PCs.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Cc: David Brownell <david-b@pacbell.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Adam Belay <ambx1@neo.rr.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stas Sergeev 2008-06-12 15:21:54 -07:00 committed by Linus Torvalds
parent 643b52b9c0
commit 1da2e3d679
2 changed files with 50 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
arch/x86/kernel/rtc.c
View File

@ -4,6 +4,8 @@
#include <linux/acpi.h>
#include <linux/bcd.h>
#include <linux/mc146818rtc.h>
#include <linux/platform_device.h>
#include <linux/pnp.h>
#include <asm/time.h>
#include <asm/vsyscall.h>
@ -197,3 +199,35 @@ unsigned long long native_read_tsc(void)
}
EXPORT_SYMBOL(native_read_tsc);
static struct resource rtc_resources[] = {
[0] = {
.start = RTC_PORT(0),
.end = RTC_PORT(1),
.flags = IORESOURCE_IO,
},
[1] = {
.start = RTC_IRQ,
.end = RTC_IRQ,
.flags = IORESOURCE_IRQ,
}
};
static struct platform_device rtc_device = {
.name = "rtc_cmos",
.id = -1,
.resource = rtc_resources,
.num_resources = ARRAY_SIZE(rtc_resources),
};
static __init int add_rtc_cmos(void)
{
#ifdef CONFIG_PNP
if (!pnp_platform_devices)
platform_device_register(&rtc_device);
#else
platform_device_register(&rtc_device);
#endif /* CONFIG_PNP */
return 0;
}
device_initcall(add_rtc_cmos);

31
drivers/rtc/rtc-cmos.c
View File

@ -905,19 +905,7 @@ static struct pnp_driver cmos_pnp_driver = {
.resume = cmos_pnp_resume,
};
static int __init cmos_init(void)
{
return pnp_register_driver(&cmos_pnp_driver);
}
module_init(cmos_init);
static void __exit cmos_exit(void)
{
pnp_unregister_driver(&cmos_pnp_driver);
}
module_exit(cmos_exit);
#else /* no PNP */
#endif /* CONFIG_PNP */
/*----------------------------------------------------------------*/
@ -958,20 +946,33 @@ static struct platform_driver cmos_platform_driver = {
static int __init cmos_init(void)
{
#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 */
}
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
platform_driver_unregister(&cmos_platform_driver);
#endif /* CONFIG_PNP */
}
module_exit(cmos_exit);
#endif /* !PNP */
MODULE_AUTHOR("David Brownell");
MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs");
MODULE_LICENSE("GPL");