From 3230bbfce8a9270acc77fafd0d9ff90e94f28993 Mon Sep 17 00:00:00 2001 From: Zhang Rui Date: Fri, 14 Mar 2014 00:34:05 +0800 Subject: 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 --- drivers/acpi/int340x_thermal.c | 51 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 drivers/acpi/int340x_thermal.c (limited to 'drivers/acpi/int340x_thermal.c') 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 + * + * 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 +#include + +#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); +} -- cgit v1.2.3