Currently, the SystemCMOS address space handler is installed for the ACPI RTC devices (PNP0B00/PNP0B01/PNP0B02) only. But there are platforms with SystemCMOS Operetion Region defined under the ACPI Time and Alarm Device (ACPI000E), which is used by the ACPI pre-defined control methods like _GRT (Get the Real time) and _SRT (Set the Real time). When accessing these control methods via the acpi_tad sysfs interface, missing SystemCMOS address space handler causes errors like below [ 478.255453] ACPI Error: No handler for Region [RTCM] (00000000a8d2dd39) [SystemCMOS] (20230331/evregion-130) [ 478.255458] ACPI Error: Region SystemCMOS (ID=5) has no handler (20230331/exfldio-261) [ 478.255461] Initialized Local Variables for Method [_GRT]: [ 478.255461] Local1: 00000000f182542c <Obj> Integer 0000000000000000 [ 478.255464] No Arguments are initialized for method [_GRT] [ 478.255465] ACPI Error: Aborting method \_SB.AWAC._GRT due to previous error (AE_NOT_EXIST) (20230331/psparse-529) Export two APIs for SystemCMOS address space handler from acpi_cmos_rtc scan handler and install the handler for the ACPI Time and Alarm Device from acpi_tad driver. Link: https://bugzilla.kernel.org/show_bug.cgi?id=217714 Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx> --- drivers/acpi/acpi_cmos_rtc.c | 25 ++++++++++++++++++------- drivers/acpi/acpi_tad.c | 26 +++++++++++++++++++++----- include/acpi/acpi_bus.h | 9 +++++++++ 3 files changed, 48 insertions(+), 12 deletions(-) diff --git a/drivers/acpi/acpi_cmos_rtc.c b/drivers/acpi/acpi_cmos_rtc.c index 4cf4aef7ce0c..9b55d1593d16 100644 --- a/drivers/acpi/acpi_cmos_rtc.c +++ b/drivers/acpi/acpi_cmos_rtc.c @@ -51,12 +51,11 @@ acpi_cmos_rtc_space_handler(u32 function, acpi_physical_address address, return AE_OK; } -static int acpi_install_cmos_rtc_space_handler(struct acpi_device *adev, - const struct acpi_device_id *id) +int acpi_install_cmos_rtc_space_handler(acpi_handle handle) { acpi_status status; - status = acpi_install_address_space_handler(adev->handle, + status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_CMOS, &acpi_cmos_rtc_space_handler, NULL, NULL); @@ -67,18 +66,30 @@ static int acpi_install_cmos_rtc_space_handler(struct acpi_device *adev, return 1; } +EXPORT_SYMBOL_GPL(acpi_install_cmos_rtc_space_handler); -static void acpi_remove_cmos_rtc_space_handler(struct acpi_device *adev) +void acpi_remove_cmos_rtc_space_handler(acpi_handle handle) { - if (ACPI_FAILURE(acpi_remove_address_space_handler(adev->handle, + if (ACPI_FAILURE(acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_CMOS, &acpi_cmos_rtc_space_handler))) pr_err("Error removing CMOS-RTC region handler\n"); } +EXPORT_SYMBOL_GPL(acpi_remove_cmos_rtc_space_handler); + +static int acpi_cmos_rtc_attach_handler(struct acpi_device *adev, const struct acpi_device_id *id) +{ + return acpi_install_cmos_rtc_space_handler(adev->handle); +} + +static void acpi_cmos_rtc_detach_handler(struct acpi_device *adev) +{ + acpi_remove_cmos_rtc_space_handler(adev->handle); +} static struct acpi_scan_handler cmos_rtc_handler = { .ids = acpi_cmos_rtc_ids, - .attach = acpi_install_cmos_rtc_space_handler, - .detach = acpi_remove_cmos_rtc_space_handler, + .attach = acpi_cmos_rtc_attach_handler, + .detach = acpi_cmos_rtc_detach_handler, }; void __init acpi_cmos_rtc_init(void) diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c index e9b8e8305e23..36ba6827d912 100644 --- a/drivers/acpi/acpi_tad.c +++ b/drivers/acpi/acpi_tad.c @@ -557,6 +557,7 @@ static int acpi_tad_disable_timer(struct device *dev, u32 timer_id) static int acpi_tad_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; + acpi_handle handle = ACPI_HANDLE(dev); struct acpi_tad_driver_data *dd = dev_get_drvdata(dev); device_init_wakeup(dev, false); @@ -577,6 +578,7 @@ static int acpi_tad_remove(struct platform_device *pdev) pm_runtime_put_sync(dev); pm_runtime_disable(dev); + acpi_remove_cmos_rtc_space_handler(handle); return 0; } @@ -589,6 +591,11 @@ static int acpi_tad_probe(struct platform_device *pdev) unsigned long long caps; int ret; + ret = acpi_install_cmos_rtc_space_handler(handle); + if (ret < 0) { + dev_info(dev, "Unable to install space handler\n"); + return -ENODEV; + } /* * Initialization failure messages are mostly about firmware issues, so * print them at the "info" level. @@ -596,22 +603,27 @@ static int acpi_tad_probe(struct platform_device *pdev) status = acpi_evaluate_integer(handle, "_GCP", NULL, &caps); if (ACPI_FAILURE(status)) { dev_info(dev, "Unable to get capabilities\n"); - return -ENODEV; + ret = -ENODEV; + goto remove_handler; } if (!(caps & ACPI_TAD_AC_WAKE)) { dev_info(dev, "Unsupported capabilities\n"); - return -ENODEV; + ret = -ENODEV; + goto remove_handler; } if (!acpi_has_method(handle, "_PRW")) { dev_info(dev, "Missing _PRW\n"); - return -ENODEV; + ret = -ENODEV; + goto remove_handler; } dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL); - if (!dd) - return -ENOMEM; + if (!dd) { + ret = -ENOMEM; + goto remove_handler; + } dd->capabilities = caps; dev_set_drvdata(dev, dd); @@ -653,6 +665,10 @@ static int acpi_tad_probe(struct platform_device *pdev) fail: acpi_tad_remove(pdev); + /* Don't fallthrough because cmos rtc space handler is removed in acpi_tad_remove() */ + return ret; +remove_handler: + acpi_remove_cmos_rtc_space_handler(handle); return ret; } diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index c941d99162c0..fb95fff23e5b 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -645,6 +645,8 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev); #ifdef CONFIG_X86 bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status); bool acpi_quirk_skip_acpi_ac_and_battery(void); +int acpi_install_cmos_rtc_space_handler(acpi_handle handle); +void acpi_remove_cmos_rtc_space_handler(acpi_handle handle); #else static inline bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status) @@ -655,6 +657,13 @@ static inline bool acpi_quirk_skip_acpi_ac_and_battery(void) { return false; } +static inline int acpi_install_cmos_rtc_space_handler(acpi_handle handle) +{ + return 1; +} +static inline void acpi_remove_cmos_rtc_space_handler(acpi_handle handle) +{ +} #endif #if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS) -- 2.34.1
