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Intel Smart Connect is an Intel-specific ACPI interface for configuring devices to wake up at regular intervals so they can pull down mail or other internet updates, and then go to sleep again. If a user enables this in Windows and then reboots into Linux, the device may wake up if it's put to sleep. Since there's no Linux userland support for any of this, the machine will then remain awake until something else puts it back to sleep. I haven't figured out all that much about how this works (there's a bunch of different ACPI calls available on the device), but this seems to be enough to turn it off. We can add more features to this driver if anyone ever cares about figuring out what the rest of the calls do or writing some Linux userspace to implement the rest of it. Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org> Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
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* Copyright 2013 Matthew Garrett <mjg59@srcf.ucam.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <acpi/acpi_drivers.h>
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MODULE_LICENSE("GPL");
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static int smartconnect_acpi_init(struct acpi_device *acpi)
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{
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struct acpi_object_list input;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *result;
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union acpi_object param;
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acpi_status status;
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status = acpi_evaluate_object(acpi->handle, "GAOS", NULL, &output);
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if (!ACPI_SUCCESS(status))
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return -EINVAL;
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result = output.pointer;
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if (result->type != ACPI_TYPE_INTEGER) {
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kfree(result);
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return -EINVAL;
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}
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if (result->integer.value & 0x1) {
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param.type = ACPI_TYPE_INTEGER;
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param.integer.value = 0;
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input.count = 1;
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input.pointer = ¶m;
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dev_info(&acpi->dev, "Disabling Intel Smart Connect\n");
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status = acpi_evaluate_object(acpi->handle, "SAOS", &input,
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NULL);
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}
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kfree(result);
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return 0;
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}
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static const struct acpi_device_id smartconnect_ids[] = {
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{"INT33A0", 0},
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{"", 0}
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};
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static struct acpi_driver smartconnect_driver = {
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.owner = THIS_MODULE,
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.name = "intel_smart_connect",
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.class = "intel_smart_connect",
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.ids = smartconnect_ids,
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.ops = {
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.add = smartconnect_acpi_init,
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},
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};
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static int smartconnect_init(void)
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{
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return acpi_bus_register_driver(&smartconnect_driver);
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}
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static void smartconnect_exit(void)
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{
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acpi_bus_unregister_driver(&smartconnect_driver);
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}
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module_init(smartconnect_init);
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module_exit(smartconnect_exit);
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MODULE_DEVICE_TABLE(acpi, smartconnect_ids);
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