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/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/slab.h>
12 #include <linux/delay.h>
13 #include <linux/hid-sensor-hub.h>
14 #include <linux/iio/iio.h>
15 #include <linux/iio/trigger.h>
16 #include <linux/iio/triggered_buffer.h>
17 #include <linux/iio/trigger_consumer.h>
18 #include <linux/iio/buffer.h>
19 #include <linux/iio/sysfs.h>
20 #include "hid-sensor-trigger.h"
21
_hid_sensor_set_report_latency(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)22 static ssize_t _hid_sensor_set_report_latency(struct device *dev,
23 struct device_attribute *attr,
24 const char *buf, size_t len)
25 {
26 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
27 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
28 int integer, fract, ret;
29 int latency;
30
31 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
32 if (ret)
33 return ret;
34
35 latency = integer * 1000 + fract / 1000;
36 ret = hid_sensor_set_report_latency(attrb, latency);
37 if (ret < 0)
38 return len;
39
40 attrb->latency_ms = hid_sensor_get_report_latency(attrb);
41
42 return len;
43 }
44
_hid_sensor_get_report_latency(struct device * dev,struct device_attribute * attr,char * buf)45 static ssize_t _hid_sensor_get_report_latency(struct device *dev,
46 struct device_attribute *attr,
47 char *buf)
48 {
49 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
50 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
51 int latency;
52
53 latency = hid_sensor_get_report_latency(attrb);
54 if (latency < 0)
55 return latency;
56
57 return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);
58 }
59
_hid_sensor_get_fifo_state(struct device * dev,struct device_attribute * attr,char * buf)60 static ssize_t _hid_sensor_get_fifo_state(struct device *dev,
61 struct device_attribute *attr,
62 char *buf)
63 {
64 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
65 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
66 int latency;
67
68 latency = hid_sensor_get_report_latency(attrb);
69 if (latency < 0)
70 return latency;
71
72 return sprintf(buf, "%d\n", !!latency);
73 }
74
75 static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
76 _hid_sensor_get_report_latency,
77 _hid_sensor_set_report_latency, 0);
78 static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
79 _hid_sensor_get_fifo_state, NULL, 0);
80
81 static const struct attribute *hid_sensor_fifo_attributes[] = {
82 &iio_dev_attr_hwfifo_timeout.dev_attr.attr,
83 &iio_dev_attr_hwfifo_enabled.dev_attr.attr,
84 NULL,
85 };
86
hid_sensor_setup_batch_mode(struct iio_dev * indio_dev,struct hid_sensor_common * st)87 static void hid_sensor_setup_batch_mode(struct iio_dev *indio_dev,
88 struct hid_sensor_common *st)
89 {
90 if (!hid_sensor_batch_mode_supported(st))
91 return;
92
93 iio_buffer_set_attrs(indio_dev->buffer, hid_sensor_fifo_attributes);
94 }
95
_hid_sensor_power_state(struct hid_sensor_common * st,bool state)96 static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
97 {
98 int state_val;
99 int report_val;
100 s32 poll_value = 0;
101
102 if (state) {
103 if (sensor_hub_device_open(st->hsdev))
104 return -EIO;
105
106 atomic_inc(&st->data_ready);
107
108 state_val = hid_sensor_get_usage_index(st->hsdev,
109 st->power_state.report_id,
110 st->power_state.index,
111 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
112 report_val = hid_sensor_get_usage_index(st->hsdev,
113 st->report_state.report_id,
114 st->report_state.index,
115 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
116
117 poll_value = hid_sensor_read_poll_value(st);
118 } else {
119 int val;
120
121 val = atomic_dec_if_positive(&st->data_ready);
122 if (val < 0)
123 return 0;
124
125 sensor_hub_device_close(st->hsdev);
126 state_val = hid_sensor_get_usage_index(st->hsdev,
127 st->power_state.report_id,
128 st->power_state.index,
129 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
130 report_val = hid_sensor_get_usage_index(st->hsdev,
131 st->report_state.report_id,
132 st->report_state.index,
133 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
134 }
135
136 if (state_val >= 0) {
137 state_val += st->power_state.logical_minimum;
138 sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
139 st->power_state.index, sizeof(state_val),
140 &state_val);
141 }
142
143 if (report_val >= 0) {
144 report_val += st->report_state.logical_minimum;
145 sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
146 st->report_state.index,
147 sizeof(report_val),
148 &report_val);
149 }
150
151 pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",
152 st->pdev->name, state_val, report_val);
153
154 sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
155 st->power_state.index,
156 sizeof(state_val), &state_val);
157 if (state && poll_value)
158 msleep_interruptible(poll_value * 2);
159
160 return 0;
161 }
162 EXPORT_SYMBOL(hid_sensor_power_state);
163
hid_sensor_power_state(struct hid_sensor_common * st,bool state)164 int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
165 {
166
167 #ifdef CONFIG_PM
168 int ret;
169
170 if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))
171 pm_runtime_enable(&st->pdev->dev);
172
173 if (state) {
174 atomic_inc(&st->user_requested_state);
175 ret = pm_runtime_get_sync(&st->pdev->dev);
176 } else {
177 atomic_dec(&st->user_requested_state);
178 pm_runtime_mark_last_busy(&st->pdev->dev);
179 pm_runtime_use_autosuspend(&st->pdev->dev);
180 ret = pm_runtime_put_autosuspend(&st->pdev->dev);
181 }
182 if (ret < 0) {
183 if (state)
184 pm_runtime_put_noidle(&st->pdev->dev);
185 return ret;
186 }
187
188 return 0;
189 #else
190 atomic_set(&st->user_requested_state, state);
191 return _hid_sensor_power_state(st, state);
192 #endif
193 }
194
hid_sensor_set_power_work(struct work_struct * work)195 static void hid_sensor_set_power_work(struct work_struct *work)
196 {
197 struct hid_sensor_common *attrb = container_of(work,
198 struct hid_sensor_common,
199 work);
200
201 if (attrb->poll_interval >= 0)
202 sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
203 attrb->poll.index,
204 sizeof(attrb->poll_interval),
205 &attrb->poll_interval);
206
207 if (attrb->raw_hystersis >= 0)
208 sensor_hub_set_feature(attrb->hsdev,
209 attrb->sensitivity.report_id,
210 attrb->sensitivity.index,
211 sizeof(attrb->raw_hystersis),
212 &attrb->raw_hystersis);
213
214 if (attrb->latency_ms > 0)
215 hid_sensor_set_report_latency(attrb, attrb->latency_ms);
216
217 if (atomic_read(&attrb->user_requested_state))
218 _hid_sensor_power_state(attrb, true);
219 }
220
hid_sensor_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)221 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
222 bool state)
223 {
224 return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
225 }
226
hid_sensor_remove_trigger(struct iio_dev * indio_dev,struct hid_sensor_common * attrb)227 void hid_sensor_remove_trigger(struct iio_dev *indio_dev,
228 struct hid_sensor_common *attrb)
229 {
230 if (atomic_read(&attrb->runtime_pm_enable))
231 pm_runtime_disable(&attrb->pdev->dev);
232
233 pm_runtime_set_suspended(&attrb->pdev->dev);
234 pm_runtime_put_noidle(&attrb->pdev->dev);
235
236 cancel_work_sync(&attrb->work);
237 iio_trigger_unregister(attrb->trigger);
238 iio_trigger_free(attrb->trigger);
239 iio_triggered_buffer_cleanup(indio_dev);
240 }
241 EXPORT_SYMBOL(hid_sensor_remove_trigger);
242
243 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
244 .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
245 };
246
hid_sensor_setup_trigger(struct iio_dev * indio_dev,const char * name,struct hid_sensor_common * attrb)247 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
248 struct hid_sensor_common *attrb)
249 {
250 int ret;
251 struct iio_trigger *trig;
252
253 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
254 NULL, NULL);
255 if (ret) {
256 dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n");
257 return ret;
258 }
259
260 trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
261 if (trig == NULL) {
262 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
263 ret = -ENOMEM;
264 goto error_triggered_buffer_cleanup;
265 }
266
267 trig->dev.parent = indio_dev->dev.parent;
268 iio_trigger_set_drvdata(trig, attrb);
269 trig->ops = &hid_sensor_trigger_ops;
270 ret = iio_trigger_register(trig);
271
272 if (ret) {
273 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
274 goto error_free_trig;
275 }
276 attrb->trigger = trig;
277 indio_dev->trig = iio_trigger_get(trig);
278
279 hid_sensor_setup_batch_mode(indio_dev, attrb);
280
281 ret = pm_runtime_set_active(&indio_dev->dev);
282 if (ret)
283 goto error_unreg_trigger;
284
285 iio_device_set_drvdata(indio_dev, attrb);
286
287 INIT_WORK(&attrb->work, hid_sensor_set_power_work);
288
289 pm_suspend_ignore_children(&attrb->pdev->dev, true);
290 /* Default to 3 seconds, but can be changed from sysfs */
291 pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
292 3000);
293 return ret;
294 error_unreg_trigger:
295 iio_trigger_unregister(trig);
296 error_free_trig:
297 iio_trigger_free(trig);
298 error_triggered_buffer_cleanup:
299 iio_triggered_buffer_cleanup(indio_dev);
300 return ret;
301 }
302 EXPORT_SYMBOL(hid_sensor_setup_trigger);
303
hid_sensor_suspend(struct device * dev)304 static int __maybe_unused hid_sensor_suspend(struct device *dev)
305 {
306 struct iio_dev *indio_dev = dev_get_drvdata(dev);
307 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
308
309 return _hid_sensor_power_state(attrb, false);
310 }
311
hid_sensor_resume(struct device * dev)312 static int __maybe_unused hid_sensor_resume(struct device *dev)
313 {
314 struct iio_dev *indio_dev = dev_get_drvdata(dev);
315 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
316 schedule_work(&attrb->work);
317 return 0;
318 }
319
hid_sensor_runtime_resume(struct device * dev)320 static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
321 {
322 struct iio_dev *indio_dev = dev_get_drvdata(dev);
323 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
324 return _hid_sensor_power_state(attrb, true);
325 }
326
327 const struct dev_pm_ops hid_sensor_pm_ops = {
328 SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
329 SET_RUNTIME_PM_OPS(hid_sensor_suspend,
330 hid_sensor_runtime_resume, NULL)
331 };
332 EXPORT_SYMBOL(hid_sensor_pm_ops);
333
334 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
335 MODULE_DESCRIPTION("HID Sensor trigger processing");
336 MODULE_LICENSE("GPL");
337