1 | /* |
2 | * HID over I2C ACPI Subclass |
3 | * |
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 |
7 | * |
8 | * This code was forked out of the core code, which was partly based on |
9 | * "USB HID support for Linux": |
10 | * |
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 |
16 | * |
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 |
19 | * more details. |
20 | */ |
21 | |
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> |
27 | #include <linux/pm.h> |
28 | #include <linux/uuid.h> |
29 | |
30 | #include "i2c-hid.h" |
31 | |
32 | struct i2c_hid_acpi { |
33 | struct i2chid_ops ops; |
34 | struct acpi_device *adev; |
35 | }; |
36 | |
37 | static const struct acpi_device_id i2c_hid_acpi_blacklist[] = { |
38 | /* |
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. |
41 | */ |
42 | { "CHPN0001" }, |
43 | /* |
44 | * The IDEA5002 ACPI device causes high interrupt usage and spurious |
45 | * wakeups from suspend. |
46 | */ |
47 | { "IDEA5002" }, |
48 | { } |
49 | }; |
50 | |
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); |
55 | |
56 | static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi) |
57 | { |
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; |
62 | |
63 | if (acpi_match_device_ids(device: adev, ids: i2c_hid_acpi_blacklist) == 0) |
64 | return -ENODEV; |
65 | |
66 | obj = acpi_evaluate_dsm_typed(handle, guid: &i2c_hid_guid, rev: 1, func: 1, NULL, |
67 | ACPI_TYPE_INTEGER); |
68 | if (!obj) { |
69 | acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n" ); |
70 | return -ENODEV; |
71 | } |
72 | |
73 | hid_descriptor_address = obj->integer.value; |
74 | ACPI_FREE(obj); |
75 | |
76 | return hid_descriptor_address; |
77 | } |
78 | |
79 | static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops) |
80 | { |
81 | struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops); |
82 | |
83 | acpi_device_set_power(device: ihid_acpi->adev, ACPI_STATE_D3_COLD); |
84 | } |
85 | |
86 | static int i2c_hid_acpi_probe(struct i2c_client *client) |
87 | { |
88 | struct device *dev = &client->dev; |
89 | struct i2c_hid_acpi *ihid_acpi; |
90 | u16 hid_descriptor_address; |
91 | int ret; |
92 | |
93 | ihid_acpi = devm_kzalloc(dev: &client->dev, size: sizeof(*ihid_acpi), GFP_KERNEL); |
94 | if (!ihid_acpi) |
95 | return -ENOMEM; |
96 | |
97 | ihid_acpi->adev = ACPI_COMPANION(dev); |
98 | ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail; |
99 | |
100 | ret = i2c_hid_acpi_get_descriptor(ihid_acpi); |
101 | if (ret < 0) |
102 | return ret; |
103 | hid_descriptor_address = ret; |
104 | |
105 | acpi_device_fix_up_power(device: ihid_acpi->adev); |
106 | |
107 | return i2c_hid_core_probe(client, ops: &ihid_acpi->ops, |
108 | hid_descriptor_address, quirks: 0); |
109 | } |
110 | |
111 | static const struct acpi_device_id i2c_hid_acpi_match[] = { |
112 | { "ACPI0C50" }, |
113 | { "PNP0C50" }, |
114 | { } |
115 | }; |
116 | MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match); |
117 | |
118 | static struct i2c_driver i2c_hid_acpi_driver = { |
119 | .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, |
124 | }, |
125 | |
126 | .probe = i2c_hid_acpi_probe, |
127 | .remove = i2c_hid_core_remove, |
128 | .shutdown = i2c_hid_core_shutdown, |
129 | }; |
130 | |
131 | module_i2c_driver(i2c_hid_acpi_driver); |
132 | |
133 | MODULE_DESCRIPTION("HID over I2C ACPI driver" ); |
134 | MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>" ); |
135 | MODULE_LICENSE("GPL" ); |
136 | |