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9#include <linux/init.h>
10#include <linux/device.h>
11#include <linux/module.h>
12#include <linux/platform_data/cros_ec_commands.h>
13#include <linux/platform_data/cros_ec_proto.h>
14#include <linux/platform_data/cros_ec_sensorhub.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/types.h>
18
19#define DRV_NAME "cros-ec-sensorhub"
20
21static void cros_ec_sensorhub_free_sensor(void *arg)
22{
23 struct platform_device *pdev = arg;
24
25 platform_device_unregister(pdev);
26}
27
28static int cros_ec_sensorhub_allocate_sensor(struct device *parent,
29 char *sensor_name,
30 int sensor_num)
31{
32 struct cros_ec_sensor_platform sensor_platforms = {
33 .sensor_num = sensor_num,
34 };
35 struct platform_device *pdev;
36
37 pdev = platform_device_register_data(parent, sensor_name,
38 PLATFORM_DEVID_AUTO,
39 &sensor_platforms,
40 sizeof(sensor_platforms));
41 if (IS_ERR(pdev))
42 return PTR_ERR(pdev);
43
44 return devm_add_action_or_reset(parent,
45 cros_ec_sensorhub_free_sensor,
46 pdev);
47}
48
49static int cros_ec_sensorhub_register(struct device *dev,
50 struct cros_ec_sensorhub *sensorhub)
51{
52 int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 };
53 struct cros_ec_dev *ec = sensorhub->ec;
54 struct ec_params_motion_sense *params;
55 struct ec_response_motion_sense *resp;
56 struct cros_ec_command *msg;
57 int ret, i, sensor_num;
58 char *name;
59
60 sensor_num = cros_ec_get_sensor_count(ec);
61 if (sensor_num < 0) {
62 dev_err(dev,
63 "Unable to retrieve sensor information (err:%d)\n",
64 sensor_num);
65 return sensor_num;
66 }
67
68 if (sensor_num == 0) {
69 dev_err(dev, "Zero sensors reported.\n");
70 return -EINVAL;
71 }
72
73
74 msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*resp)),
75 GFP_KERNEL);
76 if (!msg)
77 return -ENOMEM;
78
79 msg->version = 1;
80 msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
81 msg->outsize = sizeof(*params);
82 msg->insize = sizeof(*resp);
83 params = (struct ec_params_motion_sense *)msg->data;
84 resp = (struct ec_response_motion_sense *)msg->data;
85
86 for (i = 0; i < sensor_num; i++) {
87 params->cmd = MOTIONSENSE_CMD_INFO;
88 params->info.sensor_num = i;
89
90 ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
91 if (ret < 0) {
92 dev_warn(dev, "no info for EC sensor %d : %d/%d\n",
93 i, ret, msg->result);
94 continue;
95 }
96
97 switch (resp->info.type) {
98 case MOTIONSENSE_TYPE_ACCEL:
99 name = "cros-ec-accel";
100 break;
101 case MOTIONSENSE_TYPE_BARO:
102 name = "cros-ec-baro";
103 break;
104 case MOTIONSENSE_TYPE_GYRO:
105 name = "cros-ec-gyro";
106 break;
107 case MOTIONSENSE_TYPE_MAG:
108 name = "cros-ec-mag";
109 break;
110 case MOTIONSENSE_TYPE_PROX:
111 name = "cros-ec-prox";
112 break;
113 case MOTIONSENSE_TYPE_LIGHT:
114 name = "cros-ec-light";
115 break;
116 case MOTIONSENSE_TYPE_ACTIVITY:
117 name = "cros-ec-activity";
118 break;
119 default:
120 dev_warn(dev, "unknown type %d\n", resp->info.type);
121 continue;
122 }
123
124 ret = cros_ec_sensorhub_allocate_sensor(dev, name, i);
125 if (ret)
126 goto error;
127
128 sensor_type[resp->info.type]++;
129 }
130
131 if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
132 ec->has_kb_wake_angle = true;
133
134 if (cros_ec_check_features(ec,
135 EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) {
136 ret = cros_ec_sensorhub_allocate_sensor(dev,
137 "cros-ec-lid-angle",
138 0);
139 if (ret)
140 goto error;
141 }
142
143 kfree(msg);
144 return 0;
145
146error:
147 kfree(msg);
148 return ret;
149}
150
151static int cros_ec_sensorhub_probe(struct platform_device *pdev)
152{
153 struct device *dev = &pdev->dev;
154 struct cros_ec_sensorhub *data;
155 int ret;
156 int i;
157
158 data = devm_kzalloc(dev, sizeof(struct cros_ec_sensorhub), GFP_KERNEL);
159 if (!data)
160 return -ENOMEM;
161
162 data->ec = dev_get_drvdata(dev->parent);
163 dev_set_drvdata(dev, data);
164
165
166 if (cros_ec_check_features(data->ec, EC_FEATURE_MOTION_SENSE)) {
167 ret = cros_ec_sensorhub_register(dev, data);
168 if (ret)
169 return ret;
170 } else {
171
172
173
174
175 for (i = 0; i < 2; i++) {
176 ret = cros_ec_sensorhub_allocate_sensor(dev,
177 "cros-ec-accel-legacy", i);
178 if (ret)
179 return ret;
180 }
181 }
182
183 return 0;
184}
185
186static struct platform_driver cros_ec_sensorhub_driver = {
187 .driver = {
188 .name = DRV_NAME,
189 },
190 .probe = cros_ec_sensorhub_probe,
191};
192
193module_platform_driver(cros_ec_sensorhub_driver);
194
195MODULE_ALIAS("platform:" DRV_NAME);
196MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
197MODULE_DESCRIPTION("ChromeOS EC MEMS Sensor Hub Driver");
198MODULE_LICENSE("GPL");
199
