| Message ID | 1359338202-4942-1-git-send-email-alex.hung@canonical.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
Hi, I haven't seen any feedback for this patch, and it has not been in 3.9-rc8 yet so I assumed this patch is not accepted. I spent some time to implement the space handler in acpi_rtc_space_handler, which I will re-submit shortly. It should be a better solution than just skipping the CMOS accesses. Cheers, Alex Hung On 01/28/2013 09:56 AM, Alex Hung wrote: > This is to fix acpica returns an error and terminate when BIOS ASL > tries to access ACPI's RTC CMOS registers as the below example: > > Device (RTC) > { > Name (_HID, EisaId ("PNP0B00")) > ... > OperationRegion (CMS0, SystemCMOS, Zero, 0x40) > Field (CMS0, ByteAcc, NoLock, Preserve) > { > RTSE, 8, > Offset (0x02), > RTMN, 8, > Offset (0x04), > RTHR, 8, > Offset (0x06), > RTDY, 8, > RTDE, 8 > } > } > > Method (_Q33, 0, NotSerialized) > { > Store (^^RTC.RTMN, Local0) > FromBCD (Local0, Local0) > Store (^^RTC.RTHR, Local1) > FromBCD (Local1, Local1) > Store (^^RTC.RTDY, Local2) > Store (^^RTC.RTSE, Local3) > ... > } > > Signed-off-by: Alex Hung <alex.hung@canonical.com> > --- > drivers/acpi/Kconfig | 9 +++ > drivers/acpi/Makefile | 1 + > drivers/acpi/acpi_rtc.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 159 insertions(+) > create mode 100644 drivers/acpi/acpi_rtc.c > > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > index 38c5078..fb90397 100644 > --- a/drivers/acpi/Kconfig > +++ b/drivers/acpi/Kconfig > @@ -181,6 +181,15 @@ config ACPI_DOCK > This driver supports ACPI-controlled docking stations and removable > drive bays such as the IBM Ultrabay and the Dell Module Bay. > > +config ACPI_RTC > + tristate "RTC" > + default m > + help > + This driver supports an ACPI RTC device. It enables BIOS to read and > + to write ACPI RTC registers declared in an OperationRegion with > + RegionSpace as SYSTEMCMOS. This is required if BIOS needs to access > + RTC registers during run-time such as a number of HP laptops. > + > config ACPI_I2C > def_tristate I2C > depends on I2C > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index 2a4502b..383c62b 100644 > --- a/drivers/acpi/Makefile > +++ b/drivers/acpi/Makefile > @@ -71,6 +71,7 @@ obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o > obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o > obj-$(CONFIG_ACPI_BGRT) += bgrt.o > obj-$(CONFIG_ACPI_I2C) += acpi_i2c.o > +obj-$(CONFIG_ACPI_RTC) += acpi_rtc.o > > # processor has its own "processor." module_param namespace > processor-y := processor_driver.o processor_throttling.o > diff --git a/drivers/acpi/acpi_rtc.c b/drivers/acpi/acpi_rtc.c > new file mode 100644 > index 0000000..8d6b76b > --- /dev/null > +++ b/drivers/acpi/acpi_rtc.c > @@ -0,0 +1,149 @@ > +/* > + * acpi_rtc - ACPI RTC Driver > + * > + * Copyright (C) 2013 Alex Hung <alex.hung@canonical.com> > + * > + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or (at > + * your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License along > + * with this program; if not, write to the Free Software Foundation, Inc., > + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. > + * > + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/acpi.h> > + > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("acpi*:PNP0B00:*"); > +MODULE_ALIAS("acpi*:PNP0B01:*"); > +MODULE_ALIAS("acpi*:PNP0B02:*"); > + > +static const struct acpi_device_id rtc_device_ids[] = { > + {"PNP0B00", 0}, > + {"PNP0B01", 0}, > + {"PNP0B02", 0}, > + {"", 0}, > +}; > + > +static acpi_status acpi_acpi_handle_locate_callback(acpi_handle handle, > + u32 level, void *context, void **return_value) > +{ > + struct acpi_device *dev = context; > + > + dev->handle = handle; > + *(acpi_handle *)return_value = handle; > + > + return AE_CTRL_TERMINATE; > +} > + > +static acpi_status > +acpi_rtc_space_handler(u32 function, acpi_physical_address address, > + u32 bits, u64 *value64, > + void *handler_context, void *region_context) > +{ > + pr_warn("Accessing CMOS offset 0x%02llx is skipped.\n", address); > + > + return AE_OK; > +} > + > +static int rtc_install_handlers(struct acpi_device *rtc_dev) > +{ > + acpi_status status; > + status = acpi_install_address_space_handler(rtc_dev->handle, > + ACPI_ADR_SPACE_CMOS, > + &acpi_rtc_space_handler, > + NULL, rtc_dev); > + if (ACPI_FAILURE(status)) { > + pr_info("Fail to install ACPI RTC handler\n"); > + return AE_ERROR; > + } > + > + return 0; > +} > + > +static int acpi_rtc_add(struct acpi_device *device) > +{ > + int ret; > + int i; > + acpi_status status; > + acpi_handle rtc_dev = NULL; > + > + for (i = 0; i < sizeof(rtc_device_ids) / > + sizeof(struct acpi_device_id) - 1; i++) { > + status = acpi_get_devices(rtc_device_ids[i].id, > + acpi_acpi_handle_locate_callback, > + &rtc_dev, &rtc_dev); > + if (ACPI_SUCCESS(status) && rtc_dev) > + break; > + } > + > + if (!ACPI_SUCCESS(status) || !rtc_dev) > + return AE_NOT_FOUND; > + > + ret = rtc_install_handlers((struct acpi_device *) &rtc_dev); > + > + return ret; > +} > + > +static int acpi_rtc_remove(struct acpi_device *device, int type) > +{ > + acpi_status status; > + status = acpi_remove_address_space_handler(device->handle, > + ACPI_ADR_SPACE_CMOS, > + &acpi_rtc_space_handler); > + if (!ACPI_SUCCESS(status)) > + return AE_ERROR; > + > + return AE_OK; > +} > + > +static struct acpi_driver acpi_rtc_driver = { > + .name = "rtc", > + .class = "ACPI_RTC_CLASS", > + .ids = rtc_device_ids, > + .ops = { > + .add = acpi_rtc_add, > + .remove = acpi_rtc_remove, > + }, > +}; > + > +static int __init rtc_init(void) > +{ > + int err; > + > + pr_info("Initializing ACPI RTC module\n"); > + err = acpi_bus_register_driver(&acpi_rtc_driver); > + if (err) { > + pr_err("Unable to register acpi driver.\n"); > + goto error_acpi_register; > + } > + > + return 0; > + > +error_acpi_register: > + > + return err; > +} > + > +static void __exit rtc_exit(void) > +{ > + pr_info("Exiting ACPI RTC module\n"); > + acpi_bus_unregister_driver(&acpi_rtc_driver); > +} > + > +module_init(rtc_init); > +module_exit(rtc_exit); > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Monday, April 22, 2013 05:28:19 PM Alex Hung wrote: > Hi, Hi, > I haven't seen any feedback for this patch, and it has not been in > 3.9-rc8 yet so I assumed this patch is not accepted. Yes. In fact, we're still unsure how to address this problem. > I spent some time to implement the space handler in > acpi_rtc_space_handler, which I will re-submit shortly. It should be a > better solution than just skipping the CMOS accesses. Thanks a lot for working on this! Rafael > On 01/28/2013 09:56 AM, Alex Hung wrote: > > This is to fix acpica returns an error and terminate when BIOS ASL > > tries to access ACPI's RTC CMOS registers as the below example: > > > > Device (RTC) > > { > > Name (_HID, EisaId ("PNP0B00")) > > ... > > OperationRegion (CMS0, SystemCMOS, Zero, 0x40) > > Field (CMS0, ByteAcc, NoLock, Preserve) > > { > > RTSE, 8, > > Offset (0x02), > > RTMN, 8, > > Offset (0x04), > > RTHR, 8, > > Offset (0x06), > > RTDY, 8, > > RTDE, 8 > > } > > } > > > > Method (_Q33, 0, NotSerialized) > > { > > Store (^^RTC.RTMN, Local0) > > FromBCD (Local0, Local0) > > Store (^^RTC.RTHR, Local1) > > FromBCD (Local1, Local1) > > Store (^^RTC.RTDY, Local2) > > Store (^^RTC.RTSE, Local3) > > ... > > } > > > > Signed-off-by: Alex Hung <alex.hung@canonical.com> > > --- > > drivers/acpi/Kconfig | 9 +++ > > drivers/acpi/Makefile | 1 + > > drivers/acpi/acpi_rtc.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 159 insertions(+) > > create mode 100644 drivers/acpi/acpi_rtc.c > > > > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > > index 38c5078..fb90397 100644 > > --- a/drivers/acpi/Kconfig > > +++ b/drivers/acpi/Kconfig > > @@ -181,6 +181,15 @@ config ACPI_DOCK > > This driver supports ACPI-controlled docking stations and removable > > drive bays such as the IBM Ultrabay and the Dell Module Bay. > > > > +config ACPI_RTC > > + tristate "RTC" > > + default m > > + help > > + This driver supports an ACPI RTC device. It enables BIOS to read and > > + to write ACPI RTC registers declared in an OperationRegion with > > + RegionSpace as SYSTEMCMOS. This is required if BIOS needs to access > > + RTC registers during run-time such as a number of HP laptops. > > + > > config ACPI_I2C > > def_tristate I2C > > depends on I2C > > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > > index 2a4502b..383c62b 100644 > > --- a/drivers/acpi/Makefile > > +++ b/drivers/acpi/Makefile > > @@ -71,6 +71,7 @@ obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o > > obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o > > obj-$(CONFIG_ACPI_BGRT) += bgrt.o > > obj-$(CONFIG_ACPI_I2C) += acpi_i2c.o > > +obj-$(CONFIG_ACPI_RTC) += acpi_rtc.o > > > > # processor has its own "processor." module_param namespace > > processor-y := processor_driver.o processor_throttling.o > > diff --git a/drivers/acpi/acpi_rtc.c b/drivers/acpi/acpi_rtc.c > > new file mode 100644 > > index 0000000..8d6b76b > > --- /dev/null > > +++ b/drivers/acpi/acpi_rtc.c > > @@ -0,0 +1,149 @@ > > +/* > > + * acpi_rtc - ACPI RTC Driver > > + * > > + * Copyright (C) 2013 Alex Hung <alex.hung@canonical.com> > > + * > > + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License as published by > > + * the Free Software Foundation; either version 2 of the License, or (at > > + * your option) any later version. > > + * > > + * This program is distributed in the hope that it will be useful, but > > + * WITHOUT ANY WARRANTY; without even the implied warranty of > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > > + * General Public License for more details. > > + * > > + * You should have received a copy of the GNU General Public License along > > + * with this program; if not, write to the Free Software Foundation, Inc., > > + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. > > + * > > + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > + */ > > + > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/init.h> > > +#include <linux/acpi.h> > > + > > +MODULE_LICENSE("GPL"); > > +MODULE_ALIAS("acpi*:PNP0B00:*"); > > +MODULE_ALIAS("acpi*:PNP0B01:*"); > > +MODULE_ALIAS("acpi*:PNP0B02:*"); > > + > > +static const struct acpi_device_id rtc_device_ids[] = { > > + {"PNP0B00", 0}, > > + {"PNP0B01", 0}, > > + {"PNP0B02", 0}, > > + {"", 0}, > > +}; > > + > > +static acpi_status acpi_acpi_handle_locate_callback(acpi_handle handle, > > + u32 level, void *context, void **return_value) > > +{ > > + struct acpi_device *dev = context; > > + > > + dev->handle = handle; > > + *(acpi_handle *)return_value = handle; > > + > > + return AE_CTRL_TERMINATE; > > +} > > + > > +static acpi_status > > +acpi_rtc_space_handler(u32 function, acpi_physical_address address, > > + u32 bits, u64 *value64, > > + void *handler_context, void *region_context) > > +{ > > + pr_warn("Accessing CMOS offset 0x%02llx is skipped.\n", address); > > + > > + return AE_OK; > > +} > > + > > +static int rtc_install_handlers(struct acpi_device *rtc_dev) > > +{ > > + acpi_status status; > > + status = acpi_install_address_space_handler(rtc_dev->handle, > > + ACPI_ADR_SPACE_CMOS, > > + &acpi_rtc_space_handler, > > + NULL, rtc_dev); > > + if (ACPI_FAILURE(status)) { > > + pr_info("Fail to install ACPI RTC handler\n"); > > + return AE_ERROR; > > + } > > + > > + return 0; > > +} > > + > > +static int acpi_rtc_add(struct acpi_device *device) > > +{ > > + int ret; > > + int i; > > + acpi_status status; > > + acpi_handle rtc_dev = NULL; > > + > > + for (i = 0; i < sizeof(rtc_device_ids) / > > + sizeof(struct acpi_device_id) - 1; i++) { > > + status = acpi_get_devices(rtc_device_ids[i].id, > > + acpi_acpi_handle_locate_callback, > > + &rtc_dev, &rtc_dev); > > + if (ACPI_SUCCESS(status) && rtc_dev) > > + break; > > + } > > + > > + if (!ACPI_SUCCESS(status) || !rtc_dev) > > + return AE_NOT_FOUND; > > + > > + ret = rtc_install_handlers((struct acpi_device *) &rtc_dev); > > + > > + return ret; > > +} > > + > > +static int acpi_rtc_remove(struct acpi_device *device, int type) > > +{ > > + acpi_status status; > > + status = acpi_remove_address_space_handler(device->handle, > > + ACPI_ADR_SPACE_CMOS, > > + &acpi_rtc_space_handler); > > + if (!ACPI_SUCCESS(status)) > > + return AE_ERROR; > > + > > + return AE_OK; > > +} > > + > > +static struct acpi_driver acpi_rtc_driver = { > > + .name = "rtc", > > + .class = "ACPI_RTC_CLASS", > > + .ids = rtc_device_ids, > > + .ops = { > > + .add = acpi_rtc_add, > > + .remove = acpi_rtc_remove, > > + }, > > +}; > > + > > +static int __init rtc_init(void) > > +{ > > + int err; > > + > > + pr_info("Initializing ACPI RTC module\n"); > > + err = acpi_bus_register_driver(&acpi_rtc_driver); > > + if (err) { > > + pr_err("Unable to register acpi driver.\n"); > > + goto error_acpi_register; > > + } > > + > > + return 0; > > + > > +error_acpi_register: > > + > > + return err; > > +} > > + > > +static void __exit rtc_exit(void) > > +{ > > + pr_info("Exiting ACPI RTC module\n"); > > + acpi_bus_unregister_driver(&acpi_rtc_driver); > > +} > > + > > +module_init(rtc_init); > > +module_exit(rtc_exit); > > >
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 38c5078..fb90397 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -181,6 +181,15 @@ config ACPI_DOCK This driver supports ACPI-controlled docking stations and removable drive bays such as the IBM Ultrabay and the Dell Module Bay. +config ACPI_RTC + tristate "RTC" + default m + help + This driver supports an ACPI RTC device. It enables BIOS to read and + to write ACPI RTC registers declared in an OperationRegion with + RegionSpace as SYSTEMCMOS. This is required if BIOS needs to access + RTC registers during run-time such as a number of HP laptops. + config ACPI_I2C def_tristate I2C depends on I2C diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 2a4502b..383c62b 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -71,6 +71,7 @@ obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o obj-$(CONFIG_ACPI_BGRT) += bgrt.o obj-$(CONFIG_ACPI_I2C) += acpi_i2c.o +obj-$(CONFIG_ACPI_RTC) += acpi_rtc.o # processor has its own "processor." module_param namespace processor-y := processor_driver.o processor_throttling.o diff --git a/drivers/acpi/acpi_rtc.c b/drivers/acpi/acpi_rtc.c new file mode 100644 index 0000000..8d6b76b --- /dev/null +++ b/drivers/acpi/acpi_rtc.c @@ -0,0 +1,149 @@ +/* + * acpi_rtc - ACPI RTC Driver + * + * Copyright (C) 2013 Alex Hung <alex.hung@canonical.com> + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/acpi.h> + +MODULE_LICENSE("GPL"); +MODULE_ALIAS("acpi*:PNP0B00:*"); +MODULE_ALIAS("acpi*:PNP0B01:*"); +MODULE_ALIAS("acpi*:PNP0B02:*"); + +static const struct acpi_device_id rtc_device_ids[] = { + {"PNP0B00", 0}, + {"PNP0B01", 0}, + {"PNP0B02", 0}, + {"", 0}, +}; + +static acpi_status acpi_acpi_handle_locate_callback(acpi_handle handle, + u32 level, void *context, void **return_value) +{ + struct acpi_device *dev = context; + + dev->handle = handle; + *(acpi_handle *)return_value = handle; + + return AE_CTRL_TERMINATE; +} + +static acpi_status +acpi_rtc_space_handler(u32 function, acpi_physical_address address, + u32 bits, u64 *value64, + void *handler_context, void *region_context) +{ + pr_warn("Accessing CMOS offset 0x%02llx is skipped.\n", address); + + return AE_OK; +} + +static int rtc_install_handlers(struct acpi_device *rtc_dev) +{ + acpi_status status; + status = acpi_install_address_space_handler(rtc_dev->handle, + ACPI_ADR_SPACE_CMOS, + &acpi_rtc_space_handler, + NULL, rtc_dev); + if (ACPI_FAILURE(status)) { + pr_info("Fail to install ACPI RTC handler\n"); + return AE_ERROR; + } + + return 0; +} + +static int acpi_rtc_add(struct acpi_device *device) +{ + int ret; + int i; + acpi_status status; + acpi_handle rtc_dev = NULL; + + for (i = 0; i < sizeof(rtc_device_ids) / + sizeof(struct acpi_device_id) - 1; i++) { + status = acpi_get_devices(rtc_device_ids[i].id, + acpi_acpi_handle_locate_callback, + &rtc_dev, &rtc_dev); + if (ACPI_SUCCESS(status) && rtc_dev) + break; + } + + if (!ACPI_SUCCESS(status) || !rtc_dev) + return AE_NOT_FOUND; + + ret = rtc_install_handlers((struct acpi_device *) &rtc_dev); + + return ret; +} + +static int acpi_rtc_remove(struct acpi_device *device, int type) +{ + acpi_status status; + status = acpi_remove_address_space_handler(device->handle, + ACPI_ADR_SPACE_CMOS, + &acpi_rtc_space_handler); + if (!ACPI_SUCCESS(status)) + return AE_ERROR; + + return AE_OK; +} + +static struct acpi_driver acpi_rtc_driver = { + .name = "rtc", + .class = "ACPI_RTC_CLASS", + .ids = rtc_device_ids, + .ops = { + .add = acpi_rtc_add, + .remove = acpi_rtc_remove, + }, +}; + +static int __init rtc_init(void) +{ + int err; + + pr_info("Initializing ACPI RTC module\n"); + err = acpi_bus_register_driver(&acpi_rtc_driver); + if (err) { + pr_err("Unable to register acpi driver.\n"); + goto error_acpi_register; + } + + return 0; + +error_acpi_register: + + return err; +} + +static void __exit rtc_exit(void) +{ + pr_info("Exiting ACPI RTC module\n"); + acpi_bus_unregister_driver(&acpi_rtc_driver); +} + +module_init(rtc_init); +module_exit(rtc_exit);
This is to fix acpica returns an error and terminate when BIOS ASL tries to access ACPI's RTC CMOS registers as the below example: Device (RTC) { Name (_HID, EisaId ("PNP0B00")) ... OperationRegion (CMS0, SystemCMOS, Zero, 0x40) Field (CMS0, ByteAcc, NoLock, Preserve) { RTSE, 8, Offset (0x02), RTMN, 8, Offset (0x04), RTHR, 8, Offset (0x06), RTDY, 8, RTDE, 8 } } Method (_Q33, 0, NotSerialized) { Store (^^RTC.RTMN, Local0) FromBCD (Local0, Local0) Store (^^RTC.RTHR, Local1) FromBCD (Local1, Local1) Store (^^RTC.RTDY, Local2) Store (^^RTC.RTSE, Local3) ... } Signed-off-by: Alex Hung <alex.hung@canonical.com> --- drivers/acpi/Kconfig | 9 +++ drivers/acpi/Makefile | 1 + drivers/acpi/acpi_rtc.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 159 insertions(+) create mode 100644 drivers/acpi/acpi_rtc.c