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author | Zhang Rui <rui.zhang@intel.com> | 2014-03-13 17:34:05 +0100 |
---|---|---|
committer | Zhang Rui <rui.zhang@intel.com> | 2014-09-11 17:35:15 +0200 |
commit | 3230bbfce8a9270acc77fafd0d9ff90e94f28993 (patch) | |
tree | 6565a4262c6198ade0c1d1d97f3b930f59aa107e | |
parent | Linux 3.17-rc2 (diff) | |
download | linux-3230bbfce8a9270acc77fafd0d9ff90e94f28993.tar.xz linux-3230bbfce8a9270acc77fafd0d9ff90e94f28993.zip |
ACPI: introduce ACPI int340x thermal scan handler
Newer laptops and tablets that use ACPI may have thermal sensors and
other devices with thermal control capabilities outside the core CPU/SOC,
for thermal safety reasons.
They are exposed for the OS to use via
1) INT3400 ACPI device object as the master.
2) INT3401 ~ INT340B ACPI device objects as the slaves.
This patch introduces a scan handler to enumerate the INT3400
ACPI device object to platform bus, and prevent its slaves
from being enumerated before the controller driver being probed.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
-rw-r--r-- | drivers/acpi/Makefile | 1 | ||||
-rw-r--r-- | drivers/acpi/int340x_thermal.c | 51 | ||||
-rw-r--r-- | drivers/acpi/internal.h | 1 | ||||
-rw-r--r-- | drivers/acpi/scan.c | 1 | ||||
-rw-r--r-- | drivers/thermal/Kconfig | 17 |
5 files changed, 71 insertions, 0 deletions
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 505d4d79fe3e..c3b2fcb729f3 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o acpi-y += acpi_lpss.o acpi-y += acpi_platform.o acpi-y += acpi_pnp.o +acpi-y += int340x_thermal.o acpi-y += power.o acpi-y += event.o acpi-y += sysfs.o diff --git a/drivers/acpi/int340x_thermal.c b/drivers/acpi/int340x_thermal.c new file mode 100644 index 000000000000..2103bb6d9016 --- /dev/null +++ b/drivers/acpi/int340x_thermal.c @@ -0,0 +1,51 @@ +/* + * ACPI support for int340x thermal drivers + * + * Copyright (C) 2014, Intel Corporation + * Authors: Zhang Rui <rui.zhang@intel.com> + * + * 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> +#include <linux/module.h> + +#include "internal.h" + +#define DO_ENUMERATION 0x01 +static const struct acpi_device_id int340x_thermal_device_ids[] = { + {"INT3400", DO_ENUMERATION }, + {"INT3401"}, + {"INT3402"}, + {"INT3403"}, + {"INT3404"}, + {"INT3406"}, + {"INT3407"}, + {"INT3408"}, + {"INT3409"}, + {"INT340A"}, + {"INT340B"}, + {""}, +}; + +static int int340x_thermal_handler_attach(struct acpi_device *adev, + const struct acpi_device_id *id) +{ +#ifdef CONFIG_INT340X_THERMAL + if (id->driver_data == DO_ENUMERATION) + acpi_create_platform_device(adev); +#endif + return 1; +} + +static struct acpi_scan_handler int340x_thermal_handler = { + .ids = int340x_thermal_device_ids, + .attach = int340x_thermal_handler_attach, +}; + +void __init acpi_int340x_thermal_init(void) +{ + acpi_scan_add_handler(&int340x_thermal_handler); +} diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index 4c5cf77e7576..de47f9f746c9 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -31,6 +31,7 @@ void acpi_pci_link_init(void); void acpi_processor_init(void); void acpi_platform_init(void); void acpi_pnp_init(void); +void acpi_int340x_thermal_init(void); int acpi_sysfs_init(void); void acpi_container_init(void); void acpi_memory_hotplug_init(void); diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 0a817ad24f16..eed9740651f8 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2306,6 +2306,7 @@ int __init acpi_scan_init(void) acpi_container_init(); acpi_memory_hotplug_init(); acpi_pnp_init(); + acpi_int340x_thermal_init(); mutex_lock(&acpi_scan_lock); /* diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 693208eb9047..2ff7416ca930 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -234,6 +234,23 @@ config INTEL_SOC_DTS_THERMAL notification methods.The other trip is a critical trip point, which was set by the driver based on the TJ MAX temperature. +config INT340X_THERMAL + bool + depends on X86 && ACPI + help + Newer laptops and tablets that use ACPI may have thermal sensors and + other devices with thermal control capabilities outside the core + CPU/SOC, for thermal safety reasons. + They are exposed for the OS to use via the INT3400 ACPI device object + as the master, and INT3401~INT340B ACPI device objects as the slaves. + Enable this to expose the temperature information and cooling ability + from these objects to userspace via the normal thermal framework. + This means that a wide range of applications and GUI widgets can show + the information to the user or use this information for making + decisions. For example, the Intel Thermal Daemon can use this + information to allow the user to select his laptop to run without + turning on the fans. + menu "Texas Instruments thermal drivers" source "drivers/thermal/ti-soc-thermal/Kconfig" endmenu |