1 /*
2 * HID over I2C Open Firmware 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/delay.h>
23 #include <linux/device.h>
24 #include <linux/hid.h>
25 #include <linux/i2c.h>
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/of.h>
29 #include <linux/pm.h>
30 #include <linux/regulator/consumer.h>
31
32 #include "i2c-hid.h"
33
34 struct i2c_hid_of {
35 struct i2chid_ops ops;
36
37 struct i2c_client *client;
38 struct regulator_bulk_data supplies[2];
39 int post_power_delay_ms;
40 };
41
i2c_hid_of_power_up(struct i2chid_ops * ops)42 static int i2c_hid_of_power_up(struct i2chid_ops *ops)
43 {
44 struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
45 struct device *dev = &ihid_of->client->dev;
46 int ret;
47
48 ret = regulator_bulk_enable(ARRAY_SIZE(ihid_of->supplies),
49 ihid_of->supplies);
50 if (ret) {
51 dev_warn(dev, "Failed to enable supplies: %d\n", ret);
52 return ret;
53 }
54
55 if (ihid_of->post_power_delay_ms)
56 msleep(ihid_of->post_power_delay_ms);
57
58 return 0;
59 }
60
i2c_hid_of_power_down(struct i2chid_ops * ops)61 static void i2c_hid_of_power_down(struct i2chid_ops *ops)
62 {
63 struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
64
65 regulator_bulk_disable(ARRAY_SIZE(ihid_of->supplies),
66 ihid_of->supplies);
67 }
68
i2c_hid_of_probe(struct i2c_client * client,const struct i2c_device_id * dev_id)69 static int i2c_hid_of_probe(struct i2c_client *client,
70 const struct i2c_device_id *dev_id)
71 {
72 struct device *dev = &client->dev;
73 struct i2c_hid_of *ihid_of;
74 u16 hid_descriptor_address;
75 u32 quirks = 0;
76 int ret;
77 u32 val;
78
79 ihid_of = devm_kzalloc(&client->dev, sizeof(*ihid_of), GFP_KERNEL);
80 if (!ihid_of)
81 return -ENOMEM;
82
83 ihid_of->client = client;
84 ihid_of->ops.power_up = i2c_hid_of_power_up;
85 ihid_of->ops.power_down = i2c_hid_of_power_down;
86
87 ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
88 if (ret) {
89 dev_err(&client->dev, "HID register address not provided\n");
90 return -ENODEV;
91 }
92 if (val >> 16) {
93 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
94 val);
95 return -EINVAL;
96 }
97 hid_descriptor_address = val;
98
99 if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
100 &val))
101 ihid_of->post_power_delay_ms = val;
102
103 ihid_of->supplies[0].supply = "vdd";
104 ihid_of->supplies[1].supply = "vddl";
105 ret = devm_regulator_bulk_get(&client->dev,
106 ARRAY_SIZE(ihid_of->supplies),
107 ihid_of->supplies);
108 if (ret)
109 return ret;
110
111 if (device_property_read_bool(dev, "touchscreen-inverted-x"))
112 quirks |= HID_QUIRK_X_INVERT;
113
114 if (device_property_read_bool(dev, "touchscreen-inverted-y"))
115 quirks |= HID_QUIRK_Y_INVERT;
116
117 return i2c_hid_core_probe(client, &ihid_of->ops,
118 hid_descriptor_address, quirks);
119 }
120
121 static const struct of_device_id i2c_hid_of_match[] = {
122 { .compatible = "hid-over-i2c" },
123 {},
124 };
125 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
126
127 static const struct i2c_device_id i2c_hid_of_id_table[] = {
128 { "hid", 0 },
129 { "hid-over-i2c", 0 },
130 { },
131 };
132 MODULE_DEVICE_TABLE(i2c, i2c_hid_of_id_table);
133
134 static struct i2c_driver i2c_hid_of_driver = {
135 .driver = {
136 .name = "i2c_hid_of",
137 .pm = &i2c_hid_core_pm,
138 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
139 .of_match_table = of_match_ptr(i2c_hid_of_match),
140 },
141
142 .probe = i2c_hid_of_probe,
143 .remove = i2c_hid_core_remove,
144 .shutdown = i2c_hid_core_shutdown,
145 .id_table = i2c_hid_of_id_table,
146 };
147
148 module_i2c_driver(i2c_hid_of_driver);
149
150 MODULE_DESCRIPTION("HID over I2C OF driver");
151 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
152 MODULE_LICENSE("GPL");
153