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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lenovo-ymc.c - Lenovo Yoga Mode Control driver
*
* Copyright © 2022 Gergo Koteles <soyer@irl.hu>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/wmi.h>
#include "ideapad-laptop.h"
#define LENOVO_YMC_EVENT_GUID "06129D99-6083-4164-81AD-F092F9D773A6"
#define LENOVO_YMC_QUERY_GUID "09B0EE6E-C3FD-4243-8DA1-7911FF80BB8C"
#define LENOVO_YMC_QUERY_INSTANCE 0
#define LENOVO_YMC_QUERY_METHOD 0x01
static bool ec_trigger __read_mostly;
module_param(ec_trigger, bool, 0444);
MODULE_PARM_DESC(ec_trigger, "Enable EC triggering work-around to force emitting tablet mode events");
static const struct dmi_system_id ec_trigger_quirk_dmi_table[] = {
{
/* Lenovo Yoga 7 14ARB7 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "82QF"),
},
},
{ }
};
struct lenovo_ymc_private {
struct input_dev *input_dev;
struct acpi_device *ec_acpi_dev;
};
static void lenovo_ymc_trigger_ec(struct wmi_device *wdev, struct lenovo_ymc_private *priv)
{
int err;
if (!priv->ec_acpi_dev)
return;
err = write_ec_cmd(priv->ec_acpi_dev->handle, VPCCMD_W_YMC, 1);
if (err)
dev_warn(&wdev->dev, "Could not write YMC: %d\n", err);
}
static const struct key_entry lenovo_ymc_keymap[] = {
/* Laptop */
{ KE_SW, 0x01, { .sw = { SW_TABLET_MODE, 0 } } },
/* Tablet */
{ KE_SW, 0x02, { .sw = { SW_TABLET_MODE, 1 } } },
/* Drawing Board */
{ KE_SW, 0x03, { .sw = { SW_TABLET_MODE, 1 } } },
/* Tent */
{ KE_SW, 0x04, { .sw = { SW_TABLET_MODE, 1 } } },
{ KE_END },
};
static void lenovo_ymc_notify(struct wmi_device *wdev, union acpi_object *data)
{
struct lenovo_ymc_private *priv = dev_get_drvdata(&wdev->dev);
u32 input_val = 0;
struct acpi_buffer input = { sizeof(input_val), &input_val };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
int code;
status = wmi_evaluate_method(LENOVO_YMC_QUERY_GUID,
LENOVO_YMC_QUERY_INSTANCE,
LENOVO_YMC_QUERY_METHOD,
&input, &output);
if (ACPI_FAILURE(status)) {
dev_warn(&wdev->dev,
"Failed to evaluate query method: %s\n",
acpi_format_exception(status));
return;
}
obj = output.pointer;
if (obj->type != ACPI_TYPE_INTEGER) {
dev_warn(&wdev->dev,
"WMI event data is not an integer\n");
goto free_obj;
}
code = obj->integer.value;
if (!sparse_keymap_report_event(priv->input_dev, code, 1, true))
dev_warn(&wdev->dev, "Unknown key %d pressed\n", code);
free_obj:
kfree(obj);
lenovo_ymc_trigger_ec(wdev, priv);
}
static void acpi_dev_put_helper(void *p) { acpi_dev_put(p); }
static int lenovo_ymc_probe(struct wmi_device *wdev, const void *ctx)
{
struct lenovo_ymc_private *priv;
struct input_dev *input_dev;
int err;
ec_trigger |= dmi_check_system(ec_trigger_quirk_dmi_table);
priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (ec_trigger) {
pr_debug("Lenovo YMC enable EC triggering.\n");
priv->ec_acpi_dev = acpi_dev_get_first_match_dev("VPC2004", NULL, -1);
if (!priv->ec_acpi_dev) {
dev_err(&wdev->dev, "Could not find EC ACPI device.\n");
return -ENODEV;
}
err = devm_add_action_or_reset(&wdev->dev,
acpi_dev_put_helper, priv->ec_acpi_dev);
if (err) {
dev_err(&wdev->dev,
"Could not clean up EC ACPI device: %d\n", err);
return err;
}
}
input_dev = devm_input_allocate_device(&wdev->dev);
if (!input_dev)
return -ENOMEM;
input_dev->name = "Lenovo Yoga Tablet Mode Control switch";
input_dev->phys = LENOVO_YMC_EVENT_GUID "/input0";
input_dev->id.bustype = BUS_HOST;
input_dev->dev.parent = &wdev->dev;
err = sparse_keymap_setup(input_dev, lenovo_ymc_keymap, NULL);
if (err) {
dev_err(&wdev->dev,
"Could not set up input device keymap: %d\n", err);
return err;
}
err = input_register_device(input_dev);
if (err) {
dev_err(&wdev->dev,
"Could not register input device: %d\n", err);
return err;
}
priv->input_dev = input_dev;
dev_set_drvdata(&wdev->dev, priv);
/* Report the state for the first time on probe */
lenovo_ymc_trigger_ec(wdev, priv);
lenovo_ymc_notify(wdev, NULL);
return 0;
}
static const struct wmi_device_id lenovo_ymc_wmi_id_table[] = {
{ .guid_string = LENOVO_YMC_EVENT_GUID },
{ }
};
MODULE_DEVICE_TABLE(wmi, lenovo_ymc_wmi_id_table);
static struct wmi_driver lenovo_ymc_driver = {
.driver = {
.name = "lenovo-ymc",
},
.id_table = lenovo_ymc_wmi_id_table,
.probe = lenovo_ymc_probe,
.notify = lenovo_ymc_notify,
};
module_wmi_driver(lenovo_ymc_driver);
MODULE_AUTHOR("Gergo Koteles <soyer@irl.hu>");
MODULE_DESCRIPTION("Lenovo Yoga Mode Control driver");
MODULE_LICENSE("GPL");
|
