Commit | Line | Data |
---|---|---|
53067471 GG |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Sensor HUB driver that discovers sensors behind a ChromeOS Embedded | |
4 | * Controller. | |
5 | * | |
6 | * Copyright 2019 Google LLC | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/module.h> | |
53067471 GG |
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 | ||
21 | static void cros_ec_sensorhub_free_sensor(void *arg) | |
22 | { | |
23 | struct platform_device *pdev = arg; | |
24 | ||
25 | platform_device_unregister(pdev); | |
26 | } | |
27 | ||
28 | static 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 | ||
49 | static int cros_ec_sensorhub_register(struct device *dev, | |
50 | struct cros_ec_sensorhub *sensorhub) | |
51 | { | |
52 | int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 }; | |
145d59ba | 53 | struct cros_ec_command *msg = sensorhub->msg; |
53067471 | 54 | struct cros_ec_dev *ec = sensorhub->ec; |
b31d1d2b | 55 | int ret, i; |
53067471 GG |
56 | char *name; |
57 | ||
53067471 | 58 | |
53067471 | 59 | msg->version = 1; |
145d59ba GG |
60 | msg->insize = sizeof(struct ec_response_motion_sense); |
61 | msg->outsize = sizeof(struct ec_params_motion_sense); | |
53067471 | 62 | |
b31d1d2b | 63 | for (i = 0; i < sensorhub->sensor_num; i++) { |
145d59ba GG |
64 | sensorhub->params->cmd = MOTIONSENSE_CMD_INFO; |
65 | sensorhub->params->info.sensor_num = i; | |
53067471 GG |
66 | |
67 | ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); | |
68 | if (ret < 0) { | |
69 | dev_warn(dev, "no info for EC sensor %d : %d/%d\n", | |
70 | i, ret, msg->result); | |
71 | continue; | |
72 | } | |
73 | ||
145d59ba | 74 | switch (sensorhub->resp->info.type) { |
53067471 GG |
75 | case MOTIONSENSE_TYPE_ACCEL: |
76 | name = "cros-ec-accel"; | |
77 | break; | |
78 | case MOTIONSENSE_TYPE_BARO: | |
79 | name = "cros-ec-baro"; | |
80 | break; | |
81 | case MOTIONSENSE_TYPE_GYRO: | |
82 | name = "cros-ec-gyro"; | |
83 | break; | |
84 | case MOTIONSENSE_TYPE_MAG: | |
85 | name = "cros-ec-mag"; | |
86 | break; | |
87 | case MOTIONSENSE_TYPE_PROX: | |
88 | name = "cros-ec-prox"; | |
89 | break; | |
90 | case MOTIONSENSE_TYPE_LIGHT: | |
91 | name = "cros-ec-light"; | |
92 | break; | |
93 | case MOTIONSENSE_TYPE_ACTIVITY: | |
94 | name = "cros-ec-activity"; | |
95 | break; | |
96 | default: | |
145d59ba GG |
97 | dev_warn(dev, "unknown type %d\n", |
98 | sensorhub->resp->info.type); | |
53067471 GG |
99 | continue; |
100 | } | |
101 | ||
102 | ret = cros_ec_sensorhub_allocate_sensor(dev, name, i); | |
103 | if (ret) | |
145d59ba | 104 | return ret; |
53067471 | 105 | |
145d59ba | 106 | sensor_type[sensorhub->resp->info.type]++; |
53067471 GG |
107 | } |
108 | ||
109 | if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) | |
110 | ec->has_kb_wake_angle = true; | |
111 | ||
112 | if (cros_ec_check_features(ec, | |
113 | EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) { | |
114 | ret = cros_ec_sensorhub_allocate_sensor(dev, | |
115 | "cros-ec-lid-angle", | |
116 | 0); | |
117 | if (ret) | |
145d59ba | 118 | return ret; |
53067471 GG |
119 | } |
120 | ||
53067471 | 121 | return 0; |
53067471 GG |
122 | } |
123 | ||
124 | static int cros_ec_sensorhub_probe(struct platform_device *pdev) | |
125 | { | |
126 | struct device *dev = &pdev->dev; | |
145d59ba | 127 | struct cros_ec_dev *ec = dev_get_drvdata(dev->parent); |
53067471 | 128 | struct cros_ec_sensorhub *data; |
145d59ba | 129 | struct cros_ec_command *msg; |
b31d1d2b | 130 | int ret, i, sensor_num; |
53067471 | 131 | |
145d59ba GG |
132 | msg = devm_kzalloc(dev, sizeof(struct cros_ec_command) + |
133 | max((u16)sizeof(struct ec_params_motion_sense), | |
134 | ec->ec_dev->max_response), GFP_KERNEL); | |
135 | if (!msg) | |
136 | return -ENOMEM; | |
137 | ||
138 | msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; | |
139 | ||
53067471 GG |
140 | data = devm_kzalloc(dev, sizeof(struct cros_ec_sensorhub), GFP_KERNEL); |
141 | if (!data) | |
142 | return -ENOMEM; | |
143 | ||
145d59ba GG |
144 | mutex_init(&data->cmd_lock); |
145 | ||
146 | data->dev = dev; | |
147 | data->ec = ec; | |
148 | data->msg = msg; | |
149 | data->params = (struct ec_params_motion_sense *)msg->data; | |
150 | data->resp = (struct ec_response_motion_sense *)msg->data; | |
151 | ||
53067471 GG |
152 | dev_set_drvdata(dev, data); |
153 | ||
154 | /* Check whether this EC is a sensor hub. */ | |
b31d1d2b GG |
155 | if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE)) { |
156 | sensor_num = cros_ec_get_sensor_count(ec); | |
157 | if (sensor_num < 0) { | |
158 | dev_err(dev, | |
159 | "Unable to retrieve sensor information (err:%d)\n", | |
160 | sensor_num); | |
161 | return sensor_num; | |
162 | } | |
163 | if (sensor_num == 0) { | |
164 | dev_err(dev, "Zero sensors reported.\n"); | |
165 | return -EINVAL; | |
166 | } | |
167 | data->sensor_num = sensor_num; | |
168 | ||
169 | /* | |
170 | * Prepare the ring handler before enumering the | |
171 | * sensors. | |
172 | */ | |
173 | if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) { | |
174 | ret = cros_ec_sensorhub_ring_allocate(data); | |
175 | if (ret) | |
176 | return ret; | |
177 | } | |
178 | ||
179 | /* Enumerate the sensors.*/ | |
53067471 GG |
180 | ret = cros_ec_sensorhub_register(dev, data); |
181 | if (ret) | |
182 | return ret; | |
b31d1d2b GG |
183 | |
184 | /* | |
185 | * When the EC does not have a FIFO, the sensors will query | |
186 | * their data themselves via sysfs or a software trigger. | |
187 | */ | |
188 | if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) { | |
189 | ret = cros_ec_sensorhub_ring_add(data); | |
190 | if (ret) | |
191 | return ret; | |
192 | /* | |
193 | * The msg and its data is not under the control of the | |
194 | * ring handler. | |
195 | */ | |
196 | return devm_add_action_or_reset(dev, | |
197 | cros_ec_sensorhub_ring_remove, | |
198 | data); | |
199 | } | |
200 | ||
53067471 GG |
201 | } else { |
202 | /* | |
203 | * If the device has sensors but does not claim to | |
204 | * be a sensor hub, we are in legacy mode. | |
205 | */ | |
cee416a3 GG |
206 | data->sensor_num = 2; |
207 | for (i = 0; i < data->sensor_num; i++) { | |
53067471 GG |
208 | ret = cros_ec_sensorhub_allocate_sensor(dev, |
209 | "cros-ec-accel-legacy", i); | |
210 | if (ret) | |
211 | return ret; | |
212 | } | |
213 | } | |
214 | ||
145d59ba GG |
215 | |
216 | return 0; | |
217 | } | |
218 | ||
219 | #ifdef CONFIG_PM_SLEEP | |
220 | /* | |
221 | * When the EC is suspending, we must stop sending interrupt, | |
222 | * we may use the same interrupt line for waking up the device. | |
223 | * Tell the EC to stop sending non-interrupt event on the iio ring. | |
224 | */ | |
225 | static int cros_ec_sensorhub_suspend(struct device *dev) | |
226 | { | |
f11c35e1 | 227 | struct cros_ec_sensorhub *sensorhub = dev_get_drvdata(dev); |
145d59ba GG |
228 | struct cros_ec_dev *ec = sensorhub->ec; |
229 | ||
230 | if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) | |
231 | return cros_ec_sensorhub_ring_fifo_enable(sensorhub, false); | |
53067471 GG |
232 | return 0; |
233 | } | |
234 | ||
145d59ba GG |
235 | static int cros_ec_sensorhub_resume(struct device *dev) |
236 | { | |
f11c35e1 | 237 | struct cros_ec_sensorhub *sensorhub = dev_get_drvdata(dev); |
145d59ba GG |
238 | struct cros_ec_dev *ec = sensorhub->ec; |
239 | ||
240 | if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) | |
241 | return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true); | |
242 | return 0; | |
243 | } | |
244 | #endif | |
245 | ||
246 | static SIMPLE_DEV_PM_OPS(cros_ec_sensorhub_pm_ops, | |
247 | cros_ec_sensorhub_suspend, | |
248 | cros_ec_sensorhub_resume); | |
249 | ||
53067471 GG |
250 | static struct platform_driver cros_ec_sensorhub_driver = { |
251 | .driver = { | |
252 | .name = DRV_NAME, | |
145d59ba | 253 | .pm = &cros_ec_sensorhub_pm_ops, |
53067471 GG |
254 | }, |
255 | .probe = cros_ec_sensorhub_probe, | |
256 | }; | |
257 | ||
258 | module_platform_driver(cros_ec_sensorhub_driver); | |
259 | ||
260 | MODULE_ALIAS("platform:" DRV_NAME); | |
261 | MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>"); | |
262 | MODULE_DESCRIPTION("ChromeOS EC MEMS Sensor Hub Driver"); | |
263 | MODULE_LICENSE("GPL"); |