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 
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 len;
36 
37 	attrb->latency_ms = hid_sensor_get_report_latency(attrb);
38 
39 	return len;
40 }
41 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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