1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*
* HID over I2C Open Firmware Subclass
*
* Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
* Copyright (c) 2012 Red Hat, Inc
*
* This code was forked out of the core code, which was partly based on
* "USB HID support for Linux":
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
* Copyright (c) 2007-2008 Oliver Neukum
* Copyright (c) 2006-2010 Jiri Kosina
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#include "i2c-hid.h"
struct i2c_hid_of {
struct i2chid_ops ops;
struct i2c_client *client;
struct regulator_bulk_data supplies[2];
int post_power_delay_ms;
};
static int i2c_hid_of_power_up(struct i2chid_ops *ops)
{
struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
struct device *dev = &ihid_of->client->dev;
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
if (ret) {
dev_warn(dev, "Failed to enable supplies: %d\n", ret);
return ret;
}
if (ihid_of->post_power_delay_ms)
msleep(ihid_of->post_power_delay_ms);
return 0;
}
static void i2c_hid_of_power_down(struct i2chid_ops *ops)
{
struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
regulator_bulk_disable(ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
}
static int i2c_hid_of_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
struct device *dev = &client->dev;
struct i2c_hid_of *ihid_of;
u16 hid_descriptor_address;
u32 quirks = 0;
int ret;
u32 val;
ihid_of = devm_kzalloc(&client->dev, sizeof(*ihid_of), GFP_KERNEL);
if (!ihid_of)
return -ENOMEM;
ihid_of->ops.power_up = i2c_hid_of_power_up;
ihid_of->ops.power_down = i2c_hid_of_power_down;
ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
if (ret) {
dev_err(&client->dev, "HID register address not provided\n");
return -ENODEV;
}
if (val >> 16) {
dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
val);
return -EINVAL;
}
hid_descriptor_address = val;
if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
&val))
ihid_of->post_power_delay_ms = val;
ihid_of->supplies[0].supply = "vdd";
ihid_of->supplies[1].supply = "vddl";
ret = devm_regulator_bulk_get(&client->dev,
ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
if (ret)
return ret;
if (device_property_read_bool(dev, "touchscreen-inverted-x"))
quirks |= HID_QUIRK_X_INVERT;
if (device_property_read_bool(dev, "touchscreen-inverted-y"))
quirks |= HID_QUIRK_Y_INVERT;
return i2c_hid_core_probe(client, &ihid_of->ops,
hid_descriptor_address, quirks);
}
static const struct of_device_id i2c_hid_of_match[] = {
{ .compatible = "hid-over-i2c" },
{},
};
MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
static const struct i2c_device_id i2c_hid_of_id_table[] = {
{ "hid", 0 },
{ "hid-over-i2c", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, i2c_hid_of_id_table);
static struct i2c_driver i2c_hid_of_driver = {
.driver = {
.name = "i2c_hid_of",
.pm = &i2c_hid_core_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(i2c_hid_of_match),
},
.probe = i2c_hid_of_probe,
.remove = i2c_hid_core_remove,
.shutdown = i2c_hid_core_shutdown,
.id_table = i2c_hid_of_id_table,
};
module_i2c_driver(i2c_hid_of_driver);
MODULE_DESCRIPTION("HID over I2C OF driver");
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_LICENSE("GPL");
|
