ACPI: EC: make EC support compile-time conditional

The embedded controller code is mainly used on x86 laptops and cannot
work without PC style I/O port access.

Make this a user-visible configuration option that is default enabled
on x86 but otherwise disabled, and that can never be enabled unless
CONFIG_HAS_IOPORT is also available.

The empty stubs in internal.h help ignore the EC code in configurations
that don't support it. In order to see those stubs, the sbshc code also
has to include this header and drop duplicate declarations.

All the direct callers of ec_read/ec_write already had an x86
dependency and now also need to depend on APCI_EC.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patch.msgid.link/20241011061948.3211423-1-arnd@kernel.org
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index d67f63d..d65cd08 100644 (file)
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -132,8 +132,17 @@ config ACPI_REV_OVERRIDE_POSSIBLE
          makes it possible to force the kernel to return "5" as the supported
          ACPI revision via the "acpi_rev_override" command line switch.
 
+config ACPI_EC
+       bool "Embedded Controller"
+       depends on HAS_IOPORT
+       default X86
+       help
+         This driver handles communication with the microcontroller
+         on many x86 laptops and other machines.
+
 config ACPI_EC_DEBUGFS
        tristate "EC read/write access through /sys/kernel/debug/ec"
+       depends on ACPI_EC
        help
          Say N to disable Embedded Controller /sys/kernel/debug interface
 
@@ -433,7 +442,7 @@ config ACPI_HOTPLUG_IOAPIC
 
 config ACPI_SBS
        tristate "Smart Battery System"
-       depends on X86
+       depends on X86 && ACPI_EC
        select POWER_SUPPLY
        help
          This driver supports the Smart Battery System, another

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 61ca4af..40208a0 100644 (file)
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -41,7 +41,7 @@ acpi-y                                += resource.o
 acpi-y                         += acpi_processor.o
 acpi-y                         += processor_core.o
 acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o
-acpi-y                         += ec.o
+acpi-$(CONFIG_ACPI_EC)         += ec.o
 acpi-$(CONFIG_ACPI_DOCK)       += dock.o
 acpi-$(CONFIG_PCI)             += pci_root.o pci_link.o pci_irq.o
 obj-$(CONFIG_ACPI_MCFG)                += pci_mcfg.o

diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index ced7dff..00910cc 100644 (file)
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -215,6 +215,8 @@ extern struct acpi_ec *first_ec;
 /* External interfaces use first EC only, so remember */
 typedef int (*acpi_ec_query_func) (void *data);
 
+#ifdef CONFIG_ACPI_EC
+
 void acpi_ec_init(void);
 void acpi_ec_ecdt_probe(void);
 void acpi_ec_dsdt_probe(void);
@@ -231,6 +233,29 @@ void acpi_ec_flush_work(void);
 bool acpi_ec_dispatch_gpe(void);
 #endif
 
+#else
+
+static inline void acpi_ec_init(void) {}
+static inline void acpi_ec_ecdt_probe(void) {}
+static inline void acpi_ec_dsdt_probe(void) {}
+static inline void acpi_ec_block_transactions(void) {}
+static inline void acpi_ec_unblock_transactions(void) {}
+static inline int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
+                             acpi_handle handle, acpi_ec_query_func func,
+                             void *data)
+{
+       return -ENXIO;
+}
+static inline void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) {}
+static inline void acpi_ec_register_opregions(struct acpi_device *adev) {}
+
+static inline void acpi_ec_flush_work(void) {}
+static inline bool acpi_ec_dispatch_gpe(void)
+{
+       return false;
+}
+
+#endif
 
 /*--------------------------------------------------------------------------
                                   Suspend/Resume

diff --git a/drivers/acpi/sbshc.c b/drivers/acpi/sbshc.c
index 16f2daa..2b63cd1 100644 (file)
--- a/drivers/acpi/sbshc.c
+++ b/drivers/acpi/sbshc.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include "sbshc.h"
+#include "internal.h"
 
 #define ACPI_SMB_HC_CLASS      "smbus_host_ctl"
 #define ACPI_SMB_HC_DEVICE_NAME        "ACPI SMBus HC"
@@ -236,12 +237,6 @@ static int smbus_alarm(void *context)
        return 0;
 }
 
-typedef int (*acpi_ec_query_func) (void *data);
-
-extern int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
-                             acpi_handle handle, acpi_ec_query_func func,
-                             void *data);
-
 static int acpi_smbus_hc_add(struct acpi_device *device)
 {
        int status;
@@ -278,8 +273,6 @@ static int acpi_smbus_hc_add(struct acpi_device *device)
        return 0;
 }
 
-extern void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
-
 static void acpi_smbus_hc_remove(struct acpi_device *device)
 {
        struct acpi_smb_hc *hc;

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 7c8dd0a..8fb33c9 100644 (file)
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -238,6 +238,7 @@ config APPLICOM
 config SONYPI
        tristate "Sony Vaio Programmable I/O Control Device support"
        depends on X86_32 && PCI && INPUT
+       depends on ACPI_EC || !ACPI
        help
          This driver enables access to the Sony Programmable I/O Control
          Device which can be found in many (all ?) Sony Vaio laptops.

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 08a3c86..1e3a1f4 100644 (file)
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1752,7 +1752,7 @@ source "drivers/hwmon/occ/Kconfig"
 
 config SENSORS_OXP
        tristate "OneXPlayer EC fan control"
-       depends on ACPI
+       depends on ACPI_EC
        depends on X86
        help
                If you say yes here you get support for fan readings and control over
@@ -2592,6 +2592,7 @@ config SENSORS_ASUS_WMI
 config SENSORS_ASUS_EC
        tristate "ASUS EC Sensors"
        depends on X86
+       depends on ACPI_EC
        help
          If you say yes here you get support for the ACPI embedded controller
          hardware monitoring interface found in ASUS motherboards. The driver

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 3875abb..0258dd8 100644 (file)
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -52,6 +52,7 @@ config WMI_BMOF
 config HUAWEI_WMI
        tristate "Huawei WMI laptop extras driver"
        depends on ACPI_BATTERY
+       depends on ACPI_EC
        depends on ACPI_WMI
        depends on INPUT
        select INPUT_SPARSEKMAP
@@ -147,7 +148,7 @@ config YT2_1380
 
 config ACERHDF
        tristate "Acer Aspire One temperature and fan driver"
-       depends on ACPI && THERMAL
+       depends on ACPI_EC && THERMAL
        select THERMAL_GOV_BANG_BANG
        help
          This is a driver for Acer Aspire One netbooks. It allows to access
@@ -186,6 +187,7 @@ config ACER_WMI
        depends on SERIO_I8042
        depends on INPUT
        depends on RFKILL || RFKILL = n
+       depends on ACPI_EC
        depends on ACPI_WMI
        depends on ACPI_VIDEO || ACPI_VIDEO = n
        depends on HWMON
@@ -334,7 +336,7 @@ config MERAKI_MX100
 
 config EEEPC_LAPTOP
        tristate "Eee PC Hotkey Driver"
-       depends on ACPI
+       depends on ACPI_EC
        depends on INPUT
        depends on RFKILL || RFKILL = n
        depends on ACPI_VIDEO || ACPI_VIDEO = n
@@ -503,7 +505,7 @@ config SENSORS_HDAPS
 
 config THINKPAD_ACPI
        tristate "ThinkPad ACPI Laptop Extras"
-       depends on ACPI
+       depends on ACPI_EC
        depends on ACPI_BATTERY
        depends on INPUT
        depends on RFKILL || RFKILL = n
@@ -682,7 +684,7 @@ config MEEGOPAD_ANX7428
 
 config MSI_EC
        tristate "MSI EC Extras"
-       depends on ACPI
+       depends on ACPI_EC
        depends on ACPI_BATTERY
        help
          This driver allows various MSI laptops' functionalities to be
@@ -690,7 +692,7 @@ config MSI_EC
 
 config MSI_LAPTOP
        tristate "MSI Laptop Extras"
-       depends on ACPI
+       depends on ACPI_EC
        depends on BACKLIGHT_CLASS_DEVICE
        depends on ACPI_VIDEO || ACPI_VIDEO = n
        depends on RFKILL
@@ -796,7 +798,7 @@ config SAMSUNG_LAPTOP
 
 config SAMSUNG_Q10
        tristate "Samsung Q10 Extras"
-       depends on ACPI
+       depends on ACPI_EC
        select BACKLIGHT_CLASS_DEVICE
        help
          This driver provides support for backlight control on Samsung Q10
@@ -804,7 +806,7 @@ config SAMSUNG_Q10
 
 config ACPI_TOSHIBA
        tristate "Toshiba Laptop Extras"
-       depends on ACPI
+       depends on ACPI_EC
        depends on ACPI_BATTERY
        depends on ACPI_WMI
        select LEDS_CLASS
@@ -904,7 +906,7 @@ config ACPI_CMPC
 
 config COMPAL_LAPTOP
        tristate "Compal (and others) Laptop Extras"
-       depends on ACPI
+       depends on ACPI_EC
        depends on BACKLIGHT_CLASS_DEVICE
        depends on ACPI_VIDEO || ACPI_VIDEO = n
        depends on RFKILL
@@ -949,7 +951,7 @@ config PANASONIC_LAPTOP
 
 config SONY_LAPTOP
        tristate "Sony Laptop Extras"
-       depends on ACPI
+       depends on ACPI_EC
        depends on ACPI_VIDEO || ACPI_VIDEO = n
        depends on BACKLIGHT_CLASS_DEVICE
        depends on INPUT
@@ -972,7 +974,7 @@ config SONYPI_COMPAT
 
 config SYSTEM76_ACPI
        tristate "System76 ACPI Driver"
-       depends on ACPI
+       depends on ACPI_EC
        depends on ACPI_BATTERY
        depends on HWMON
        depends on INPUT

diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig
index 68a4978..dc21227 100644 (file)
--- a/drivers/platform/x86/dell/Kconfig
+++ b/drivers/platform/x86/dell/Kconfig
@@ -194,6 +194,7 @@ config DELL_WMI
 config DELL_WMI_PRIVACY
        bool "Dell WMI Hardware Privacy Support"
        depends on DELL_WMI
+       depends on ACPI_EC
        help
          This option adds integration with the "Dell Hardware Privacy"
          feature of Dell laptops to the dell-wmi driver.

diff --git a/drivers/platform/x86/hp/Kconfig b/drivers/platform/x86/hp/Kconfig
index d776761..dd51491 100644 (file)
--- a/drivers/platform/x86/hp/Kconfig
+++ b/drivers/platform/x86/hp/Kconfig
@@ -37,6 +37,7 @@ config HP_ACCEL
 config HP_WMI
        tristate "HP WMI extras"
        default m
+       depends on ACPI_EC
        depends on ACPI_WMI
        depends on INPUT
        depends on RFKILL || RFKILL = n

diff --git a/drivers/platform/x86/intel/Kconfig b/drivers/platform/x86/intel/Kconfig
index ad50bba..eb698dc 100644 (file)
--- a/drivers/platform/x86/intel/Kconfig
+++ b/drivers/platform/x86/intel/Kconfig
@@ -62,7 +62,7 @@ config INTEL_INT0002_VGPIO
 
 config INTEL_OAKTRAIL
        tristate "Intel Oaktrail Platform Extras"
-       depends on ACPI
+       depends on ACPI_EC
        depends on ACPI_VIDEO || ACPI_VIDEO=n
        depends on RFKILL && BACKLIGHT_CLASS_DEVICE && ACPI
        help

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 4d5ee84..7dd24ac 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1164,8 +1164,6 @@ int acpi_subsys_suspend_noirq(struct device *dev);
 int acpi_subsys_suspend(struct device *dev);
 int acpi_subsys_freeze(struct device *dev);
 int acpi_subsys_poweroff(struct device *dev);
-void acpi_ec_mark_gpe_for_wake(void);
-void acpi_ec_set_gpe_wake_mask(u8 action);
 int acpi_subsys_restore_early(struct device *dev);
 #else
 static inline int acpi_subsys_prepare(struct device *dev) { return 0; }
@@ -1176,6 +1174,12 @@ static inline int acpi_subsys_suspend(struct device *dev) { return 0; }
 static inline int acpi_subsys_freeze(struct device *dev) { return 0; }
 static inline int acpi_subsys_poweroff(struct device *dev) { return 0; }
 static inline int acpi_subsys_restore_early(struct device *dev) { return 0; }
+#endif
+
+#if defined(CONFIG_ACPI_EC) && defined(CONFIG_PM_SLEEP)
+void acpi_ec_mark_gpe_for_wake(void);
+void acpi_ec_set_gpe_wake_mask(u8 action);
+#else
 static inline void acpi_ec_mark_gpe_for_wake(void) {}
 static inline void acpi_ec_set_gpe_wake_mask(u8 action) {}
 #endif