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 <linux/iio/kfifo_buf.h>
18 #include "hid-sensor-trigger.h"
19
_hid_sensor_set_report_latency(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)20 static ssize_t _hid_sensor_set_report_latency(struct device *dev,
21 struct device_attribute *attr,
22 const char *buf, size_t len)
23 {
24 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
25 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
26 int integer, fract, ret;
27 int latency;
28
29 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
30 if (ret)
31 return ret;
32
33 latency = integer * 1000 + fract / 1000;
34 ret = hid_sensor_set_report_latency(attrb, latency);
35 if (ret < 0)
36 return ret;
37
38 attrb->latency_ms = hid_sensor_get_report_latency(attrb);
39
40 return len;
41 }
42
_hid_sensor_get_report_latency(struct device * dev,struct device_attribute * attr,char * buf)43 static ssize_t _hid_sensor_get_report_latency(struct device *dev,
44 struct device_attribute *attr,
45 char *buf)
46 {
47 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
48 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
49 int latency;
50
51 latency = hid_sensor_get_report_latency(attrb);
52 if (latency < 0)
53 return latency;
54
55 return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000);
56 }
57
_hid_sensor_get_fifo_state(struct device * dev,struct device_attribute * attr,char * buf)58 static ssize_t _hid_sensor_get_fifo_state(struct device *dev,
59 struct device_attribute *attr,
60 char *buf)
61 {
62 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
63 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
64 int latency;
65
66 latency = hid_sensor_get_report_latency(attrb);
67 if (latency < 0)
68 return latency;
69
70 return sprintf(buf, "%d\n", !!latency);
71 }
72
73 static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
74 _hid_sensor_get_report_latency,
75 _hid_sensor_set_report_latency, 0);
76 static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
77 _hid_sensor_get_fifo_state, NULL, 0);
78
79 static const struct iio_dev_attr *hid_sensor_fifo_attributes[] = {
80 &iio_dev_attr_hwfifo_timeout,
81 &iio_dev_attr_hwfifo_enabled,
82 NULL,
83 };
84
_hid_sensor_power_state(struct hid_sensor_common * st,bool state)85 static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
86 {
87 int state_val;
88 int report_val;
89 s32 poll_value = 0;
90
91 if (state) {
92 if (sensor_hub_device_open(st->hsdev))
93 return -EIO;
94
95 atomic_inc(&st->data_ready);
96
97 state_val = hid_sensor_get_usage_index(st->hsdev,
98 st->power_state.report_id,
99 st->power_state.index,
100 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
101 report_val = hid_sensor_get_usage_index(st->hsdev,
102 st->report_state.report_id,
103 st->report_state.index,
104 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
105
106 poll_value = hid_sensor_read_poll_value(st);
107 } else {
108 int val;
109
110 val = atomic_dec_if_positive(&st->data_ready);
111 if (val < 0)
112 return 0;
113
114 sensor_hub_device_close(st->hsdev);
115 state_val = hid_sensor_get_usage_index(st->hsdev,
116 st->power_state.report_id,
117 st->power_state.index,
118 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
119 report_val = hid_sensor_get_usage_index(st->hsdev,
120 st->report_state.report_id,
121 st->report_state.index,
122 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
123 }
124
125 if (state_val >= 0) {
126 state_val += st->power_state.logical_minimum;
127 sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
128 st->power_state.index, sizeof(state_val),
129 &state_val);
130 }
131
132 if (report_val >= 0) {
133 report_val += st->report_state.logical_minimum;
134 sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
135 st->report_state.index,
136 sizeof(report_val),
137 &report_val);
138 }
139
140 pr_debug("HID_SENSOR %s set power_state %d report_state %d\n",
141 st->pdev->name, state_val, report_val);
142
143 sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
144 st->power_state.index,
145 sizeof(state_val), &state_val);
146 if (state && poll_value)
147 msleep_interruptible(poll_value * 2);
148
149 return 0;
150 }
151 EXPORT_SYMBOL_NS(hid_sensor_power_state, "IIO_HID");
152
hid_sensor_power_state(struct hid_sensor_common * st,bool state)153 int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
154 {
155
156 #ifdef CONFIG_PM
157 int ret;
158
159 if (atomic_add_unless(&st->runtime_pm_enable, 1, 1))
160 pm_runtime_enable(&st->pdev->dev);
161
162 if (state) {
163 atomic_inc(&st->user_requested_state);
164 ret = pm_runtime_resume_and_get(&st->pdev->dev);
165 } else {
166 atomic_dec(&st->user_requested_state);
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
buffer_postenable(struct iio_dev * indio_dev)206 static int buffer_postenable(struct iio_dev *indio_dev)
207 {
208 return hid_sensor_power_state(iio_device_get_drvdata(indio_dev), 1);
209 }
210
buffer_predisable(struct iio_dev * indio_dev)211 static int buffer_predisable(struct iio_dev *indio_dev)
212 {
213 return hid_sensor_power_state(iio_device_get_drvdata(indio_dev), 0);
214 }
215
216 static const struct iio_buffer_setup_ops hid_sensor_buffer_ops = {
217 .postenable = buffer_postenable,
218 .predisable = buffer_predisable,
219 };
220
hid_sensor_remove_trigger(struct iio_dev * indio_dev,struct hid_sensor_common * attrb)221 void hid_sensor_remove_trigger(struct iio_dev *indio_dev,
222 struct hid_sensor_common *attrb)
223 {
224 if (atomic_read(&attrb->runtime_pm_enable))
225 pm_runtime_disable(&attrb->pdev->dev);
226
227 pm_runtime_set_suspended(&attrb->pdev->dev);
228
229 cancel_work_sync(&attrb->work);
230 iio_trigger_unregister(attrb->trigger);
231 iio_trigger_free(attrb->trigger);
232 }
233 EXPORT_SYMBOL_NS(hid_sensor_remove_trigger, "IIO_HID");
234
hid_sensor_setup_trigger(struct iio_dev * indio_dev,const char * name,struct hid_sensor_common * attrb)235 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
236 struct hid_sensor_common *attrb)
237 {
238 const struct iio_dev_attr **fifo_attrs;
239 int ret;
240 struct iio_trigger *trig;
241
242 if (hid_sensor_batch_mode_supported(attrb))
243 fifo_attrs = hid_sensor_fifo_attributes;
244 else
245 fifo_attrs = NULL;
246
247 indio_dev->modes = INDIO_DIRECT_MODE | INDIO_HARDWARE_TRIGGERED;
248
249 ret = devm_iio_kfifo_buffer_setup_ext(&indio_dev->dev, indio_dev,
250 &hid_sensor_buffer_ops,
251 fifo_attrs);
252 if (ret) {
253 dev_err(&indio_dev->dev, "Kfifo Buffer Setup Failed\n");
254 return ret;
255 }
256
257 /*
258 * The current user space in distro "iio-sensor-proxy" is not working in
259 * trigerless mode and it expects
260 * /sys/bus/iio/devices/iio:device0/trigger/current_trigger.
261 * The change replacing iio_triggered_buffer_setup_ext() with
262 * devm_iio_kfifo_buffer_setup_ext() will not create attribute without
263 * registering a trigger with INDIO_HARDWARE_TRIGGERED.
264 * So the below code fragment is still required.
265 */
266
267 trig = iio_trigger_alloc(indio_dev->dev.parent,
268 "%s-dev%d", name, iio_device_id(indio_dev));
269 if (trig == NULL) {
270 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
271 return -ENOMEM;
272 }
273
274 iio_trigger_set_drvdata(trig, attrb);
275 ret = iio_trigger_register(trig);
276
277 if (ret) {
278 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
279 goto error_free_trig;
280 }
281 attrb->trigger = trig;
282 indio_dev->trig = iio_trigger_get(trig);
283
284 ret = pm_runtime_set_active(&indio_dev->dev);
285 if (ret)
286 goto error_unreg_trigger;
287
288 iio_device_set_drvdata(indio_dev, attrb);
289
290 INIT_WORK(&attrb->work, hid_sensor_set_power_work);
291
292 pm_suspend_ignore_children(&attrb->pdev->dev, true);
293 /* Default to 3 seconds, but can be changed from sysfs */
294 pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
295 3000);
296 return ret;
297 error_unreg_trigger:
298 iio_trigger_unregister(trig);
299 error_free_trig:
300 iio_trigger_free(trig);
301 return ret;
302 }
303 EXPORT_SYMBOL_NS(hid_sensor_setup_trigger, "IIO_HID");
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_NS(hid_sensor_pm_ops, "IIO_HID");
334
335 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
336 MODULE_DESCRIPTION("HID Sensor trigger processing");
337 MODULE_LICENSE("GPL");
338 MODULE_IMPORT_NS("IIO_HID_ATTRIBUTES");
339