1 /*
2  * HID Sensors Driver
3  * Copyright (c) 2012, Intel Corporation.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms and conditions of the GNU General Public License,
7  * version 2, as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17  *
18  */
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/module.h>
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/slab.h>
25 #include <linux/delay.h>
26 #include <linux/hid-sensor-hub.h>
27 #include <linux/iio/iio.h>
28 #include <linux/iio/trigger.h>
29 #include <linux/iio/buffer.h>
30 #include <linux/iio/sysfs.h>
31 #include "hid-sensor-trigger.h"
32 
_hid_sensor_set_report_latency(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)33 static ssize_t _hid_sensor_set_report_latency(struct device *dev,
34 					      struct device_attribute *attr,
35 					      const char *buf, size_t len)
36 {
37 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
38 	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
39 	int integer, fract, ret;
40 	int latency;
41 
42 	ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
43 	if (ret)
44 		return ret;
45 
46 	latency = integer * 1000 + fract / 1000;
47 	ret = hid_sensor_set_report_latency(attrb, latency);
48 	if (ret < 0)
49 		return len;
50 
51 	attrb->latency_ms = hid_sensor_get_report_latency(attrb);
52 
53 	return len;
54 }
55 
_hid_sensor_get_report_latency(struct device * dev,struct device_attribute * attr,char * buf)56 static ssize_t _hid_sensor_get_report_latency(struct device *dev,
57 					      struct device_attribute *attr,
58 					      char *buf)
59 {
60 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
61 	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
62 	int latency;
63 
64 	latency = hid_sensor_get_report_latency(attrb);
65 	if (latency < 0)
66 		return latency;
67 
68 	return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);
69 }
70 
_hid_sensor_get_fifo_state(struct device * dev,struct device_attribute * attr,char * buf)71 static ssize_t _hid_sensor_get_fifo_state(struct device *dev,
72 					  struct device_attribute *attr,
73 					  char *buf)
74 {
75 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
76 	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
77 	int latency;
78 
79 	latency = hid_sensor_get_report_latency(attrb);
80 	if (latency < 0)
81 		return latency;
82 
83 	return sprintf(buf, "%d\n", !!latency);
84 }
85 
86 static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
87 		       _hid_sensor_get_report_latency,
88 		       _hid_sensor_set_report_latency, 0);
89 static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
90 		       _hid_sensor_get_fifo_state, NULL, 0);
91 
92 static const struct attribute *hid_sensor_fifo_attributes[] = {
93 	&iio_dev_attr_hwfifo_timeout.dev_attr.attr,
94 	&iio_dev_attr_hwfifo_enabled.dev_attr.attr,
95 	NULL,
96 };
97 
hid_sensor_setup_batch_mode(struct iio_dev * indio_dev,struct hid_sensor_common * st)98 static void hid_sensor_setup_batch_mode(struct iio_dev *indio_dev,
99 					struct hid_sensor_common *st)
100 {
101 	if (!hid_sensor_batch_mode_supported(st))
102 		return;
103 
104 	iio_buffer_set_attrs(indio_dev->buffer, hid_sensor_fifo_attributes);
105 }
106 
_hid_sensor_power_state(struct hid_sensor_common * st,bool state)107 static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
108 {
109 	int state_val;
110 	int report_val;
111 	s32 poll_value = 0;
112 
113 	if (state) {
114 		if (sensor_hub_device_open(st->hsdev))
115 			return -EIO;
116 
117 		atomic_inc(&st->data_ready);
118 
119 		state_val = hid_sensor_get_usage_index(st->hsdev,
120 			st->power_state.report_id,
121 			st->power_state.index,
122 			HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
123 		report_val = hid_sensor_get_usage_index(st->hsdev,
124 			st->report_state.report_id,
125 			st->report_state.index,
126 			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
127 
128 		poll_value = hid_sensor_read_poll_value(st);
129 	} else {
130 		int val;
131 
132 		val = atomic_dec_if_positive(&st->data_ready);
133 		if (val < 0)
134 			return 0;
135 
136 		sensor_hub_device_close(st->hsdev);
137 		state_val = hid_sensor_get_usage_index(st->hsdev,
138 			st->power_state.report_id,
139 			st->power_state.index,
140 			HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
141 		report_val = hid_sensor_get_usage_index(st->hsdev,
142 			st->report_state.report_id,
143 			st->report_state.index,
144 			HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
145 	}
146 
147 	if (state_val >= 0) {
148 		state_val += st->power_state.logical_minimum;
149 		sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
150 				       st->power_state.index, sizeof(state_val),
151 				       &state_val);
152 	}
153 
154 	if (report_val >= 0) {
155 		report_val += st->report_state.logical_minimum;
156 		sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
157 				       st->report_state.index,
158 				       sizeof(report_val),
159 				       &report_val);
160 	}
161 
162 	pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",
163 		 st->pdev->name, state_val, report_val);
164 
165 	sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
166 			       st->power_state.index,
167 			       sizeof(state_val), &state_val);
168 	if (state && poll_value)
169 		msleep_interruptible(poll_value * 2);
170 
171 	return 0;
172 }
173 EXPORT_SYMBOL(hid_sensor_power_state);
174 
hid_sensor_power_state(struct hid_sensor_common * st,bool state)175 int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
176 {
177 
178 #ifdef CONFIG_PM
179 	int ret;
180 
181 	if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))
182 		pm_runtime_enable(&st->pdev->dev);
183 
184 	if (state) {
185 		atomic_inc(&st->user_requested_state);
186 		ret = pm_runtime_get_sync(&st->pdev->dev);
187 	} else {
188 		atomic_dec(&st->user_requested_state);
189 		pm_runtime_mark_last_busy(&st->pdev->dev);
190 		pm_runtime_use_autosuspend(&st->pdev->dev);
191 		ret = pm_runtime_put_autosuspend(&st->pdev->dev);
192 	}
193 	if (ret < 0) {
194 		if (state)
195 			pm_runtime_put_noidle(&st->pdev->dev);
196 		return ret;
197 	}
198 
199 	return 0;
200 #else
201 	atomic_set(&st->user_requested_state, state);
202 	return _hid_sensor_power_state(st, state);
203 #endif
204 }
205 
hid_sensor_set_power_work(struct work_struct * work)206 static void hid_sensor_set_power_work(struct work_struct *work)
207 {
208 	struct hid_sensor_common *attrb = container_of(work,
209 						       struct hid_sensor_common,
210 						       work);
211 
212 	if (attrb->poll_interval >= 0)
213 		sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
214 				       attrb->poll.index,
215 				       sizeof(attrb->poll_interval),
216 				       &attrb->poll_interval);
217 
218 	if (attrb->raw_hystersis >= 0)
219 		sensor_hub_set_feature(attrb->hsdev,
220 				       attrb->sensitivity.report_id,
221 				       attrb->sensitivity.index,
222 				       sizeof(attrb->raw_hystersis),
223 				       &attrb->raw_hystersis);
224 
225 	if (attrb->latency_ms > 0)
226 		hid_sensor_set_report_latency(attrb, attrb->latency_ms);
227 
228 	if (atomic_read(&attrb->user_requested_state))
229 		_hid_sensor_power_state(attrb, true);
230 }
231 
hid_sensor_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)232 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
233 						bool state)
234 {
235 	return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
236 }
237 
hid_sensor_remove_trigger(struct hid_sensor_common * attrb)238 void hid_sensor_remove_trigger(struct hid_sensor_common *attrb)
239 {
240 	if (atomic_read(&attrb->runtime_pm_enable))
241 		pm_runtime_disable(&attrb->pdev->dev);
242 
243 	pm_runtime_set_suspended(&attrb->pdev->dev);
244 	pm_runtime_put_noidle(&attrb->pdev->dev);
245 
246 	cancel_work_sync(&attrb->work);
247 	iio_trigger_unregister(attrb->trigger);
248 	iio_trigger_free(attrb->trigger);
249 }
250 EXPORT_SYMBOL(hid_sensor_remove_trigger);
251 
252 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
253 	.set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
254 };
255 
hid_sensor_setup_trigger(struct iio_dev * indio_dev,const char * name,struct hid_sensor_common * attrb)256 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
257 				struct hid_sensor_common *attrb)
258 {
259 	int ret;
260 	struct iio_trigger *trig;
261 
262 	trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
263 	if (trig == NULL) {
264 		dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
265 		ret = -ENOMEM;
266 		goto error_ret;
267 	}
268 
269 	trig->dev.parent = indio_dev->dev.parent;
270 	iio_trigger_set_drvdata(trig, attrb);
271 	trig->ops = &hid_sensor_trigger_ops;
272 	ret = iio_trigger_register(trig);
273 
274 	if (ret) {
275 		dev_err(&indio_dev->dev, "Trigger Register Failed\n");
276 		goto error_free_trig;
277 	}
278 	attrb->trigger = trig;
279 	indio_dev->trig = iio_trigger_get(trig);
280 
281 	hid_sensor_setup_batch_mode(indio_dev, attrb);
282 
283 	ret = pm_runtime_set_active(&indio_dev->dev);
284 	if (ret)
285 		goto error_unreg_trigger;
286 
287 	iio_device_set_drvdata(indio_dev, attrb);
288 
289 	INIT_WORK(&attrb->work, hid_sensor_set_power_work);
290 
291 	pm_suspend_ignore_children(&attrb->pdev->dev, true);
292 	/* Default to 3 seconds, but can be changed from sysfs */
293 	pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
294 					 3000);
295 	return ret;
296 error_unreg_trigger:
297 	iio_trigger_unregister(trig);
298 error_free_trig:
299 	iio_trigger_free(trig);
300 error_ret:
301 	return ret;
302 }
303 EXPORT_SYMBOL(hid_sensor_setup_trigger);
304 
hid_sensor_suspend(struct device * dev)305 static int __maybe_unused hid_sensor_suspend(struct device *dev)
306 {
307 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
308 	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
309 
310 	return _hid_sensor_power_state(attrb, false);
311 }
312 
hid_sensor_resume(struct device * dev)313 static int __maybe_unused hid_sensor_resume(struct device *dev)
314 {
315 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
316 	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
317 	schedule_work(&attrb->work);
318 	return 0;
319 }
320 
hid_sensor_runtime_resume(struct device * dev)321 static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
322 {
323 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
324 	struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
325 	return _hid_sensor_power_state(attrb, true);
326 }
327 
328 const struct dev_pm_ops hid_sensor_pm_ops = {
329 	SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
330 	SET_RUNTIME_PM_OPS(hid_sensor_suspend,
331 			   hid_sensor_runtime_resume, NULL)
332 };
333 EXPORT_SYMBOL(hid_sensor_pm_ops);
334 
335 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
336 MODULE_DESCRIPTION("HID Sensor trigger processing");
337 MODULE_LICENSE("GPL");
338