cros_ec_sensorhub.c
4.58 KB
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
188
189
190
191
192
193
194
195
196
197
198
// SPDX-License-Identifier: GPL-2.0
/*
* Sensor HUB driver that discovers sensors behind a ChromeOS Embedded
* Controller.
*
* Copyright 2019 Google LLC
*/
#include <linux/init.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/platform_data/cros_ec_sensorhub.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#define DRV_NAME "cros-ec-sensorhub"
static void cros_ec_sensorhub_free_sensor(void *arg)
{
struct platform_device *pdev = arg;
platform_device_unregister(pdev);
}
static int cros_ec_sensorhub_allocate_sensor(struct device *parent,
char *sensor_name,
int sensor_num)
{
struct cros_ec_sensor_platform sensor_platforms = {
.sensor_num = sensor_num,
};
struct platform_device *pdev;
pdev = platform_device_register_data(parent, sensor_name,
PLATFORM_DEVID_AUTO,
&sensor_platforms,
sizeof(sensor_platforms));
if (IS_ERR(pdev))
return PTR_ERR(pdev);
return devm_add_action_or_reset(parent,
cros_ec_sensorhub_free_sensor,
pdev);
}
static int cros_ec_sensorhub_register(struct device *dev,
struct cros_ec_sensorhub *sensorhub)
{
int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 };
struct cros_ec_dev *ec = sensorhub->ec;
struct ec_params_motion_sense *params;
struct ec_response_motion_sense *resp;
struct cros_ec_command *msg;
int ret, i, sensor_num;
char *name;
sensor_num = cros_ec_get_sensor_count(ec);
if (sensor_num < 0) {
dev_err(dev,
"Unable to retrieve sensor information (err:%d)\n",
sensor_num);
return sensor_num;
}
if (sensor_num == 0) {
dev_err(dev, "Zero sensors reported.\n");
return -EINVAL;
}
/* Prepare a message to send INFO command to each sensor. */
msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*resp)),
GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg->version = 1;
msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
msg->outsize = sizeof(*params);
msg->insize = sizeof(*resp);
params = (struct ec_params_motion_sense *)msg->data;
resp = (struct ec_response_motion_sense *)msg->data;
for (i = 0; i < sensor_num; i++) {
params->cmd = MOTIONSENSE_CMD_INFO;
params->info.sensor_num = i;
ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0) {
dev_warn(dev, "no info for EC sensor %d : %d/%d\n",
i, ret, msg->result);
continue;
}
switch (resp->info.type) {
case MOTIONSENSE_TYPE_ACCEL:
name = "cros-ec-accel";
break;
case MOTIONSENSE_TYPE_BARO:
name = "cros-ec-baro";
break;
case MOTIONSENSE_TYPE_GYRO:
name = "cros-ec-gyro";
break;
case MOTIONSENSE_TYPE_MAG:
name = "cros-ec-mag";
break;
case MOTIONSENSE_TYPE_PROX:
name = "cros-ec-prox";
break;
case MOTIONSENSE_TYPE_LIGHT:
name = "cros-ec-light";
break;
case MOTIONSENSE_TYPE_ACTIVITY:
name = "cros-ec-activity";
break;
default:
dev_warn(dev, "unknown type %d\n", resp->info.type);
continue;
}
ret = cros_ec_sensorhub_allocate_sensor(dev, name, i);
if (ret)
goto error;
sensor_type[resp->info.type]++;
}
if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
ec->has_kb_wake_angle = true;
if (cros_ec_check_features(ec,
EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) {
ret = cros_ec_sensorhub_allocate_sensor(dev,
"cros-ec-lid-angle",
0);
if (ret)
goto error;
}
kfree(msg);
return 0;
error:
kfree(msg);
return ret;
}
static int cros_ec_sensorhub_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cros_ec_sensorhub *data;
int ret;
int i;
data = devm_kzalloc(dev, sizeof(struct cros_ec_sensorhub), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->ec = dev_get_drvdata(dev->parent);
dev_set_drvdata(dev, data);
/* Check whether this EC is a sensor hub. */
if (cros_ec_check_features(data->ec, EC_FEATURE_MOTION_SENSE)) {
ret = cros_ec_sensorhub_register(dev, data);
if (ret)
return ret;
} else {
/*
* If the device has sensors but does not claim to
* be a sensor hub, we are in legacy mode.
*/
for (i = 0; i < 2; i++) {
ret = cros_ec_sensorhub_allocate_sensor(dev,
"cros-ec-accel-legacy", i);
if (ret)
return ret;
}
}
return 0;
}
static struct platform_driver cros_ec_sensorhub_driver = {
.driver = {
.name = DRV_NAME,
},
.probe = cros_ec_sensorhub_probe,
};
module_platform_driver(cros_ec_sensorhub_driver);
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
MODULE_DESCRIPTION("ChromeOS EC MEMS Sensor Hub Driver");
MODULE_LICENSE("GPL");