131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/*
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* HID over I2C ACPI Subclass
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*
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* Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
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* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
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* Copyright (c) 2012 Red Hat, Inc
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*
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* This code was forked out of the core code, which was partly based on
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* "USB HID support for Linux":
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*
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* Copyright (c) 1999 Andreas Gal
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* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
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* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
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* Copyright (c) 2007-2008 Oliver Neukum
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* Copyright (c) 2006-2010 Jiri Kosina
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/uuid.h>
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#include "i2c-hid.h"
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struct i2c_hid_acpi {
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struct i2chid_ops ops;
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struct acpi_device *adev;
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};
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static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
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/*
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* The CHPN0001 ACPI device, which is used to describe the Chipone
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* ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
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*/
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{ "CHPN0001" },
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{ }
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};
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/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
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static guid_t i2c_hid_guid =
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GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
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0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
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static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi)
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{
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struct acpi_device *adev = ihid_acpi->adev;
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acpi_handle handle = acpi_device_handle(adev);
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union acpi_object *obj;
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u16 hid_descriptor_address;
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if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
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return -ENODEV;
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obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
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ACPI_TYPE_INTEGER);
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if (!obj) {
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acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
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return -ENODEV;
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}
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hid_descriptor_address = obj->integer.value;
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ACPI_FREE(obj);
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return hid_descriptor_address;
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}
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static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
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{
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struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops);
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acpi_device_set_power(ihid_acpi->adev, ACPI_STATE_D3_COLD);
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}
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static int i2c_hid_acpi_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct i2c_hid_acpi *ihid_acpi;
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u16 hid_descriptor_address;
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int ret;
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ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL);
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if (!ihid_acpi)
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return -ENOMEM;
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ihid_acpi->adev = ACPI_COMPANION(dev);
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ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail;
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ret = i2c_hid_acpi_get_descriptor(ihid_acpi);
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if (ret < 0)
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return ret;
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hid_descriptor_address = ret;
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acpi_device_fix_up_power(ihid_acpi->adev);
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return i2c_hid_core_probe(client, &ihid_acpi->ops,
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hid_descriptor_address, 0);
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}
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static const struct acpi_device_id i2c_hid_acpi_match[] = {
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{ "ACPI0C50" },
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{ "PNP0C50" },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
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static struct i2c_driver i2c_hid_acpi_driver = {
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.driver = {
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.name = "i2c_hid_acpi",
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.pm = &i2c_hid_core_pm,
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.acpi_match_table = i2c_hid_acpi_match,
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},
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.probe = i2c_hid_acpi_probe,
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.remove = i2c_hid_core_remove,
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.shutdown = i2c_hid_core_shutdown,
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};
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module_i2c_driver(i2c_hid_acpi_driver);
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MODULE_DESCRIPTION("HID over I2C ACPI driver");
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MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
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MODULE_LICENSE("GPL");
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