1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * HID Sensors Driver
4 * Copyright (c) 2012, Intel Corporation.
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
_hid_sensor_set_report_latency(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)19 static 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 ret;
36
37 attrb->latency_ms = hid_sensor_get_report_latency(attrb);
38
39 return len;
40 }
41
_hid_sensor_get_report_latency(struct device * dev,struct device_attribute * attr,char * buf)42 static 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
_hid_sensor_get_fifo_state(struct device * dev,struct device_attribute * attr,char * buf)57 static 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
72 static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
73 _hid_sensor_get_report_latency,
74 _hid_sensor_set_report_latency, 0);
75 static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
76 _hid_sensor_get_fifo_state, NULL, 0);
77
78 static const struct iio_dev_attr *hid_sensor_fifo_attributes[] = {
79 &iio_dev_attr_hwfifo_timeout,
80 &iio_dev_attr_hwfifo_enabled,
81 NULL,
82 };
83
_hid_sensor_power_state(struct hid_sensor_common * st,bool state)84 static 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 }
150 EXPORT_SYMBOL_NS(hid_sensor_power_state, IIO_HID);
151
hid_sensor_power_state(struct hid_sensor_common * st,bool state)152 int 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
hid_sensor_set_power_work(struct work_struct * work)180 static 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
hid_sensor_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)206 static 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
hid_sensor_remove_trigger(struct iio_dev * indio_dev,struct hid_sensor_common * attrb)212 void 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 }
225 EXPORT_SYMBOL_NS(hid_sensor_remove_trigger, IIO_HID);
226
227 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
228 .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
229 };
230
hid_sensor_setup_trigger(struct iio_dev * indio_dev,const char * name,struct hid_sensor_common * attrb)231 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
232 struct hid_sensor_common *attrb)
233 {
234 const struct iio_dev_attr **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, NULL,
245 IIO_BUFFER_DIRECTION_IN,
246 NULL, fifo_attrs);
247 if (ret) {
248 dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");
249 return ret;
250 }
251
252 trig = iio_trigger_alloc(indio_dev->dev.parent,
253 "%s-dev%d", name, iio_device_id(indio_dev));
254 if (trig == NULL) {
255 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
256 ret = -ENOMEM;
257 goto error_triggered_buffer_cleanup;
258 }
259
260 iio_trigger_set_drvdata(trig, attrb);
261 trig->ops = &hid_sensor_trigger_ops;
262 ret = iio_trigger_register(trig);
263
264 if (ret) {
265 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
266 goto error_free_trig;
267 }
268 attrb->trigger = trig;
269 indio_dev->trig = iio_trigger_get(trig);
270
271 ret = pm_runtime_set_active(&indio_dev->dev);
272 if (ret)
273 goto error_unreg_trigger;
274
275 iio_device_set_drvdata(indio_dev, attrb);
276
277 INIT_WORK(&attrb->work, hid_sensor_set_power_work);
278
279 pm_suspend_ignore_children(&attrb->pdev->dev, true);
280 /* Default to 3 seconds, but can be changed from sysfs */
281 pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
282 3000);
283 return ret;
284 error_unreg_trigger:
285 iio_trigger_unregister(trig);
286 error_free_trig:
287 iio_trigger_free(trig);
288 error_triggered_buffer_cleanup:
289 iio_triggered_buffer_cleanup(indio_dev);
290 return ret;
291 }
292 EXPORT_SYMBOL_NS(hid_sensor_setup_trigger, IIO_HID);
293
hid_sensor_suspend(struct device * dev)294 static int __maybe_unused hid_sensor_suspend(struct device *dev)
295 {
296 struct iio_dev *indio_dev = dev_get_drvdata(dev);
297 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
298
299 return _hid_sensor_power_state(attrb, false);
300 }
301
hid_sensor_resume(struct device * dev)302 static int __maybe_unused hid_sensor_resume(struct device *dev)
303 {
304 struct iio_dev *indio_dev = dev_get_drvdata(dev);
305 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
306 schedule_work(&attrb->work);
307 return 0;
308 }
309
hid_sensor_runtime_resume(struct device * dev)310 static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
311 {
312 struct iio_dev *indio_dev = dev_get_drvdata(dev);
313 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
314 return _hid_sensor_power_state(attrb, true);
315 }
316
317 const struct dev_pm_ops hid_sensor_pm_ops = {
318 SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
319 SET_RUNTIME_PM_OPS(hid_sensor_suspend,
320 hid_sensor_runtime_resume, NULL)
321 };
322 EXPORT_SYMBOL_NS(hid_sensor_pm_ops, IIO_HID);
323
324 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
325 MODULE_DESCRIPTION("HID Sensor trigger processing");
326 MODULE_LICENSE("GPL");
327 MODULE_IMPORT_NS(IIO_HID_ATTRIBUTES);
328