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linux/drivers/acpi/tiny-power-button.c

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ACPI: Add new tiny-power-button driver to directly signal init Virtual machines often use an ACPI power button event to tell the machine to shut down gracefully. Provide an extremely lightweight "tiny power button" driver to handle this event by signaling init directly, rather than running a separate daemon (such as acpid or systemd-logind) that adds to startup time and VM image complexity. The kernel configuration defines the default signal to send init, and userspace can change this signal via a module parameter. Suggested-by: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-02-11 15:38:06 -08:00
ACPI: tiny-power-button: Convert the driver to a platform one While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI tiny-power-button driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ rjw: White space fixup ] Link: https://patch.msgid.link/5629403.Sb9uPGUboI@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2025-12-15 14:59:00 +01:00
ACPI: Add new tiny-power-button driver to directly signal init Virtual machines often use an ACPI power button event to tell the machine to shut down gracefully. Provide an extremely lightweight "tiny power button" driver to handle this event by signaling init directly, rather than running a separate daemon (such as acpid or systemd-logind) that adds to startup time and VM image complexity. The kernel configuration defines the default signal to send init, and userspace can change this signal via a module parameter. Suggested-by: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-02-11 15:38:06 -08:00
ACPI: tiny-power-button: Eliminate the driver notify callback Rework the ACPI tiny-power-button driver to install a notify handler or a fixed event handler for the device it binds to by itself and drop its notify callback. This will allow acpi_device_install_notify_handler() and acpi_device_remove_notify_handler() to be simplified going forward. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2023-06-04 17:22:48 +02:00
ACPI: Add new tiny-power-button driver to directly signal init Virtual machines often use an ACPI power button event to tell the machine to shut down gracefully. Provide an extremely lightweight "tiny power button" driver to handle this event by signaling init directly, rather than running a separate daemon (such as acpid or systemd-logind) that adds to startup time and VM image complexity. The kernel configuration defines the default signal to send init, and userspace can change this signal via a module parameter. Suggested-by: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-02-11 15:38:06 -08:00
ACPI: tiny-power-button: Eliminate the driver notify callback Rework the ACPI tiny-power-button driver to install a notify handler or a fixed event handler for the device it binds to by itself and drop its notify callback. This will allow acpi_device_install_notify_handler() and acpi_device_remove_notify_handler() to be simplified going forward. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2023-06-04 17:22:48 +02:00
ACPI: tiny-power-button: Convert the driver to a platform one While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI tiny-power-button driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ rjw: White space fixup ] Link: https://patch.msgid.link/5629403.Sb9uPGUboI@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2025-12-15 14:59:00 +01:00
ACPI: tiny-power-button: Eliminate the driver notify callback Rework the ACPI tiny-power-button driver to install a notify handler or a fixed event handler for the device it binds to by itself and drop its notify callback. This will allow acpi_device_install_notify_handler() and acpi_device_remove_notify_handler() to be simplified going forward. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2023-06-04 17:22:48 +02:00
ACPI: tiny-power-button: Convert the driver to a platform one While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI tiny-power-button driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ rjw: White space fixup ] Link: https://patch.msgid.link/5629403.Sb9uPGUboI@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2025-12-15 14:59:00 +01:00
ACPI: tiny-power-button: Eliminate the driver notify callback Rework the ACPI tiny-power-button driver to install a notify handler or a fixed event handler for the device it binds to by itself and drop its notify callback. This will allow acpi_device_install_notify_handler() and acpi_device_remove_notify_handler() to be simplified going forward. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2023-06-04 17:22:48 +02:00
ACPI: Add new tiny-power-button driver to directly signal init Virtual machines often use an ACPI power button event to tell the machine to shut down gracefully. Provide an extremely lightweight "tiny power button" driver to handle this event by signaling init directly, rather than running a separate daemon (such as acpid or systemd-logind) that adds to startup time and VM image complexity. The kernel configuration defines the default signal to send init, and userspace can change this signal via a module parameter. Suggested-by: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-02-11 15:38:06 -08:00
ACPI: tiny-power-button: Convert the driver to a platform one While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI tiny-power-button driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ rjw: White space fixup ] Link: https://patch.msgid.link/5629403.Sb9uPGUboI@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2025-12-15 14:59:00 +01:00
ACPI: make remove callback of ACPI driver void For bus-based driver, device removal is implemented as: 1 device_remove()-> 2 bus->remove()-> 3 driver->remove() Driver core needs no inform from callee(bus driver) about the result of remove callback. In that case, commit fc7a6209d571 ("bus: Make remove callback return void") forces bus_type::remove be void-returned. Now we have the situation that both 1 & 2 of calling chain are void-returned, so it does not make much sense for 3(driver->remove) to return non-void to its caller. So the basic idea behind this change is making remove() callback of any bus-based driver to be void-returned. This change, for itself, is for device drivers based on acpi-bus. Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Lee Jones <lee@kernel.org> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Dawei Li <set_pte_at@outlook.com> Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for drivers/platform/surface/* Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2022-11-14 00:26:09 +08:00
ACPI: tiny-power-button: Convert the driver to a platform one While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI tiny-power-button driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ rjw: White space fixup ] Link: https://patch.msgid.link/5629403.Sb9uPGUboI@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2025-12-15 14:59:00 +01:00
ACPI: tiny-power-button: Eliminate the driver notify callback Rework the ACPI tiny-power-button driver to install a notify handler or a fixed event handler for the device it binds to by itself and drop its notify callback. This will allow acpi_device_install_notify_handler() and acpi_device_remove_notify_handler() to be simplified going forward. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2023-06-04 17:22:48 +02:00
ACPI: Add new tiny-power-button driver to directly signal init Virtual machines often use an ACPI power button event to tell the machine to shut down gracefully. Provide an extremely lightweight "tiny power button" driver to handle this event by signaling init directly, rather than running a separate daemon (such as acpid or systemd-logind) that adds to startup time and VM image complexity. The kernel configuration defines the default signal to send init, and userspace can change this signal via a module parameter. Suggested-by: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-02-11 15:38:06 -08:00
ACPI: tiny-power-button: Convert the driver to a platform one While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI tiny-power-button driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ rjw: White space fixup ] Link: https://patch.msgid.link/5629403.Sb9uPGUboI@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2025-12-15 14:59:00 +01:00
ACPI: Add new tiny-power-button driver to directly signal init Virtual machines often use an ACPI power button event to tell the machine to shut down gracefully. Provide an extremely lightweight "tiny power button" driver to handle this event by signaling init directly, rather than running a separate daemon (such as acpid or systemd-logind) that adds to startup time and VM image complexity. The kernel configuration defines the default signal to send init, and userspace can change this signal via a module parameter. Suggested-by: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-02-11 15:38:06 -08:00
ACPI: tiny-power-button: Convert the driver to a platform one While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI tiny-power-button driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ rjw: White space fixup ] Link: https://patch.msgid.link/5629403.Sb9uPGUboI@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2025-12-15 14:59:00 +01:00