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

   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
  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
  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
  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
  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
 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
 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
 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
 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
 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
 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
 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
 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
 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");