[PATCH v4 05/18] ARM64 / ACPI: Introduce sleep-arm.c
From: Hanjun Guo <hidden>
Date: 2014-09-12 14:01:18
Also in:
linux-acpi, lkml
Subsystem:
acpi, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
From: Graeme Gregory <redacted> ACPI 5.1 does not currently support S states for ARM64 hardware but ACPI code will call acpi_target_system_state() for device power managment, so introduce sleep-arm.c to allow other drivers to function until S states are defined. Signed-off-by: Graeme Gregory <redacted> Signed-off-by: Tomasz Nowicki <redacted> Signed-off-by: Hanjun Guo <redacted> --- drivers/acpi/Makefile | 4 ++++ drivers/acpi/sleep-arm.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+) create mode 100644 drivers/acpi/sleep-arm.c
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 505d4d7..89837f8 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile@@ -23,7 +23,11 @@ acpi-y += nvs.o # Power management related files acpi-y += wakeup.o +ifeq ($(ARCH), arm64) +acpi-y += sleep-arm.o +else # X86, IA64 acpi-y += sleep.o +endif acpi-y += device_pm.o acpi-$(CONFIG_ACPI_SLEEP) += proc.o
diff --git a/drivers/acpi/sleep-arm.c b/drivers/acpi/sleep-arm.c
new file mode 100644
index 0000000..54578ef
--- /dev/null
+++ b/drivers/acpi/sleep-arm.c@@ -0,0 +1,28 @@ +/* + * ARM64 Specific Sleep Functionality + * + * Copyright (C) 2013-2014, Linaro Ltd. + * Author: Graeme Gregory <graeme.gregory@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/acpi.h> + +/* + * Currently the ACPI 5.1 standard does not define S states in a + * manner which is usable for ARM64. These two stubs are sufficient + * that system initialises and device PM works. + */ +u32 acpi_target_system_state(void) +{ + return ACPI_STATE_S0; +} +EXPORT_SYMBOL_GPL(acpi_target_system_state); + +int __init acpi_sleep_init(void) +{ + return -ENOSYS; +}
--
1.7.9.5