1
2
3
4
5
6#include <linux/device.h>
7#include <linux/platform_device.h>
8#include <linux/module.h>
9#include <linux/delay.h>
10#include <linux/hid-sensor-hub.h>
11#include <linux/workqueue.h>
12#include <linux/iio/iio.h>
13#include <linux/iio/trigger.h>
14#include <linux/iio/triggered_buffer.h>
15#include <linux/iio/trigger_consumer.h>
16#include <linux/iio/sysfs.h>
17#include "hid-sensor-trigger.h"
18
19static ssize_t _hid_sensor_set_report_latency(struct device *dev,
20 struct device_attribute *attr,
21 const char *buf, size_t len)
22{
23 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
24 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
25 int integer, fract, ret;
26 int latency;
27
28 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
29 if (ret)
30 return ret;
31
32 latency = integer * 1000 + fract / 1000;
33 ret = hid_sensor_set_report_latency(attrb, latency);
34 if (ret < 0)
35 return len;
36
37 attrb->latency_ms = hid_sensor_get_report_latency(attrb);
38
39 return len;
40}
41
42static ssize_t _hid_sensor_get_report_latency(struct device *dev,
43 struct device_attribute *attr,
44 char *buf)
45{
46 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
47 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
48 int latency;
49
50 latency = hid_sensor_get_report_latency(attrb);
51 if (latency < 0)
52 return latency;
53
54 return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);
55}
56
57static ssize_t _hid_sensor_get_fifo_state(struct device *dev,
58 struct device_attribute *attr,
59 char *buf)
60{
61 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
62 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
63 int latency;
64
65 latency = hid_sensor_get_report_latency(attrb);
66 if (latency < 0)
67 return latency;
68
69 return sprintf(buf, "%d\n", !!latency);
70}
71
72static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
73 _hid_sensor_get_report_latency,
74 _hid_sensor_set_report_latency, 0);
75static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
76 _hid_sensor_get_fifo_state, NULL, 0);
77
78static const struct attribute *hid_sensor_fifo_attributes[] = {
79 &iio_dev_attr_hwfifo_timeout.dev_attr.attr,
80 &iio_dev_attr_hwfifo_enabled.dev_attr.attr,
81 NULL,
82};
83
84static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
85{
86 int state_val;
87 int report_val;
88 s32 poll_value = 0;
89
90 if (state) {
91 if (sensor_hub_device_open(st->hsdev))
92 return -EIO;
93
94 atomic_inc(&st->data_ready);
95
96 state_val = hid_sensor_get_usage_index(st->hsdev,
97 st->power_state.report_id,
98 st->power_state.index,
99 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
100 report_val = hid_sensor_get_usage_index(st->hsdev,
101 st->report_state.report_id,
102 st->report_state.index,
103 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
104
105 poll_value = hid_sensor_read_poll_value(st);
106 } else {
107 int val;
108
109 val = atomic_dec_if_positive(&st->data_ready);
110 if (val < 0)
111 return 0;
112
113 sensor_hub_device_close(st->hsdev);
114 state_val = hid_sensor_get_usage_index(st->hsdev,
115 st->power_state.report_id,
116 st->power_state.index,
117 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
118 report_val = hid_sensor_get_usage_index(st->hsdev,
119 st->report_state.report_id,
120 st->report_state.index,
121 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
122 }
123
124 if (state_val >= 0) {
125 state_val += st->power_state.logical_minimum;
126 sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
127 st->power_state.index, sizeof(state_val),
128 &state_val);
129 }
130
131 if (report_val >= 0) {
132 report_val += st->report_state.logical_minimum;
133 sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
134 st->report_state.index,
135 sizeof(report_val),
136 &report_val);
137 }
138
139 pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",
140 st->pdev->name, state_val, report_val);
141
142 sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
143 st->power_state.index,
144 sizeof(state_val), &state_val);
145 if (state && poll_value)
146 msleep_interruptible(poll_value * 2);
147
148 return 0;
149}
150EXPORT_SYMBOL_NS(hid_sensor_power_state, IIO_HID);
151
152int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
153{
154
155#ifdef CONFIG_PM
156 int ret;
157
158 if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))
159 pm_runtime_enable(&st->pdev->dev);
160
161 if (state) {
162 atomic_inc(&st->user_requested_state);
163 ret = pm_runtime_resume_and_get(&st->pdev->dev);
164 } else {
165 atomic_dec(&st->user_requested_state);
166 pm_runtime_mark_last_busy(&st->pdev->dev);
167 pm_runtime_use_autosuspend(&st->pdev->dev);
168 ret = pm_runtime_put_autosuspend(&st->pdev->dev);
169 }
170 if (ret < 0)
171 return ret;
172
173 return 0;
174#else
175 atomic_set(&st->user_requested_state, state);
176 return _hid_sensor_power_state(st, state);
177#endif
178}
179
180static void hid_sensor_set_power_work(struct work_struct *work)
181{
182 struct hid_sensor_common *attrb = container_of(work,
183 struct hid_sensor_common,
184 work);
185
186 if (attrb->poll_interval >= 0)
187 sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
188 attrb->poll.index,
189 sizeof(attrb->poll_interval),
190 &attrb->poll_interval);
191
192 if (attrb->raw_hystersis >= 0)
193 sensor_hub_set_feature(attrb->hsdev,
194 attrb->sensitivity.report_id,
195 attrb->sensitivity.index,
196 sizeof(attrb->raw_hystersis),
197 &attrb->raw_hystersis);
198
199 if (attrb->latency_ms > 0)
200 hid_sensor_set_report_latency(attrb, attrb->latency_ms);
201
202 if (atomic_read(&attrb->user_requested_state))
203 _hid_sensor_power_state(attrb, true);
204}
205
206static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
207 bool state)
208{
209 return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
210}
211
212void hid_sensor_remove_trigger(struct iio_dev *indio_dev,
213 struct hid_sensor_common *attrb)
214{
215 if (atomic_read(&attrb->runtime_pm_enable))
216 pm_runtime_disable(&attrb->pdev->dev);
217
218 pm_runtime_set_suspended(&attrb->pdev->dev);
219
220 cancel_work_sync(&attrb->work);
221 iio_trigger_unregister(attrb->trigger);
222 iio_trigger_free(attrb->trigger);
223 iio_triggered_buffer_cleanup(indio_dev);
224}
225EXPORT_SYMBOL_NS(hid_sensor_remove_trigger, IIO_HID);
226
227static const struct iio_trigger_ops hid_sensor_trigger_ops = {
228 .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
229};
230
231int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
232 struct hid_sensor_common *attrb)
233{
234 const struct attribute **fifo_attrs;
235 int ret;
236 struct iio_trigger *trig;
237
238 if (hid_sensor_batch_mode_supported(attrb))
239 fifo_attrs = hid_sensor_fifo_attributes;
240 else
241 fifo_attrs = NULL;
242
243 ret = iio_triggered_buffer_setup_ext(indio_dev,
244 &iio_pollfunc_store_time,
245 NULL, NULL, fifo_attrs);
246 if (ret) {
247 dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");
248 return ret;
249 }
250
251 trig = iio_trigger_alloc(indio_dev->dev.parent,
252 "%s-dev%d", name, iio_device_id(indio_dev));
253 if (trig == NULL) {
254 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
255 ret = -ENOMEM;
256 goto error_triggered_buffer_cleanup;
257 }
258
259 iio_trigger_set_drvdata(trig, attrb);
260 trig->ops = &hid_sensor_trigger_ops;
261 ret = iio_trigger_register(trig);
262
263 if (ret) {
264 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
265 goto error_free_trig;
266 }
267 attrb->trigger = trig;
268 indio_dev->trig = iio_trigger_get(trig);
269
270 ret = pm_runtime_set_active(&indio_dev->dev);
271 if (ret)
272 goto error_unreg_trigger;
273
274 iio_device_set_drvdata(indio_dev, attrb);
275
276 INIT_WORK(&attrb->work, hid_sensor_set_power_work);
277
278 pm_suspend_ignore_children(&attrb->pdev->dev, true);
279
280 pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
281 3000);
282 return ret;
283error_unreg_trigger:
284 iio_trigger_unregister(trig);
285error_free_trig:
286 iio_trigger_free(trig);
287error_triggered_buffer_cleanup:
288 iio_triggered_buffer_cleanup(indio_dev);
289 return ret;
290}
291EXPORT_SYMBOL_NS(hid_sensor_setup_trigger, IIO_HID);
292
293static int __maybe_unused hid_sensor_suspend(struct device *dev)
294{
295 struct iio_dev *indio_dev = dev_get_drvdata(dev);
296 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
297
298 return _hid_sensor_power_state(attrb, false);
299}
300
301static int __maybe_unused hid_sensor_resume(struct device *dev)
302{
303 struct iio_dev *indio_dev = dev_get_drvdata(dev);
304 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
305 schedule_work(&attrb->work);
306 return 0;
307}
308
309static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
310{
311 struct iio_dev *indio_dev = dev_get_drvdata(dev);
312 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
313 return _hid_sensor_power_state(attrb, true);
314}
315
316const struct dev_pm_ops hid_sensor_pm_ops = {
317 SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
318 SET_RUNTIME_PM_OPS(hid_sensor_suspend,
319 hid_sensor_runtime_resume, NULL)
320};
321EXPORT_SYMBOL_NS(hid_sensor_pm_ops, IIO_HID);
322
323MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
324MODULE_DESCRIPTION("HID Sensor trigger processing");
325MODULE_LICENSE("GPL");
326MODULE_IMPORT_NS(IIO_HID_ATTRIBUTES);
327
