2 * HID over I2C ACPI Subclass
4 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
5 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
6 * Copyright (c) 2012 Red Hat, Inc
8 * This code was forked out of the core code, which was partly based on
9 * "USB HID support for Linux":
11 * Copyright (c) 1999 Andreas Gal
12 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
13 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
14 * Copyright (c) 2007-2008 Oliver Neukum
15 * Copyright (c) 2006-2010 Jiri Kosina
17 * This file is subject to the terms and conditions of the GNU General Public
18 * License. See the file COPYING in the main directory of this archive for
22 #include <linux/acpi.h>
23 #include <linux/device.h>
24 #include <linux/i2c.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
28 #include <linux/uuid.h>
33 struct i2chid_ops ops;
34 struct acpi_device *adev;
37 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
39 * The CHPN0001 ACPI device, which is used to describe the Chipone
40 * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
44 * The IDEA5002 ACPI device causes high interrupt usage and spurious
45 * wakeups from suspend.
51 /* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
52 static guid_t i2c_hid_guid =
53 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
54 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
56 static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi)
58 struct acpi_device *adev = ihid_acpi->adev;
59 acpi_handle handle = acpi_device_handle(adev);
60 union acpi_object *obj;
61 u16 hid_descriptor_address;
63 if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
66 obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
69 acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
73 hid_descriptor_address = obj->integer.value;
76 return hid_descriptor_address;
79 static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
81 struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops);
83 acpi_device_set_power(ihid_acpi->adev, ACPI_STATE_D3_COLD);
86 static int i2c_hid_acpi_probe(struct i2c_client *client)
88 struct device *dev = &client->dev;
89 struct i2c_hid_acpi *ihid_acpi;
90 u16 hid_descriptor_address;
93 ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL);
97 ihid_acpi->adev = ACPI_COMPANION(dev);
98 ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail;
100 ret = i2c_hid_acpi_get_descriptor(ihid_acpi);
103 hid_descriptor_address = ret;
105 acpi_device_fix_up_power(ihid_acpi->adev);
107 return i2c_hid_core_probe(client, &ihid_acpi->ops,
108 hid_descriptor_address, 0);
111 static const struct acpi_device_id i2c_hid_acpi_match[] = {
116 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
118 static struct i2c_driver i2c_hid_acpi_driver = {
120 .name = "i2c_hid_acpi",
121 .pm = &i2c_hid_core_pm,
122 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
123 .acpi_match_table = i2c_hid_acpi_match,
126 .probe = i2c_hid_acpi_probe,
127 .remove = i2c_hid_core_remove,
128 .shutdown = i2c_hid_core_shutdown,
131 module_i2c_driver(i2c_hid_acpi_driver);
133 MODULE_DESCRIPTION("HID over I2C ACPI driver");
134 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
135 MODULE_LICENSE("GPL");