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Commit 3230bbfc authored by Zhang Rui's avatar Zhang Rui
Browse files

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: default avatarZhang Rui <rui.zhang@intel.com>
parent 52addcf9

drivers/acpi/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/acpi/int340x_thermal.c

0 → 100644
+51 −0
Original line number Diff line number Diff line 
/*

 * 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);

}

drivers/acpi/internal.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

drivers/acpi/scan.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

	/*

drivers/thermal/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -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