drivers/iio/common/hid-sensors/hid-sensor-trigger.c

   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);