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 (!atomic_read(&st->user_requested_state))
 115                         return 0;
 116                 if (sensor_hub_device_open(st->hsdev))
 117                         return -EIO;
 118
 119                 atomic_inc(&st->data_ready);
 120
 121                 state_val = hid_sensor_get_usage_index(st->hsdev,
 122                         st->power_state.report_id,
 123                         st->power_state.index,
 124                         HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM);
 125                 report_val = hid_sensor_get_usage_index(st->hsdev,
 126                         st->report_state.report_id,
 127                         st->report_state.index,
 128                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
 129
 130                 poll_value = hid_sensor_read_poll_value(st);
 131         } else {
 132                 int val;
 133
 134                 val = atomic_dec_if_positive(&st->data_ready);
 135                 if (val < 0)
 136                         return 0;
 137
 138                 sensor_hub_device_close(st->hsdev);
 139                 state_val = hid_sensor_get_usage_index(st->hsdev,
 140                         st->power_state.report_id,
 141                         st->power_state.index,
 142                         HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM);
 143                 report_val = hid_sensor_get_usage_index(st->hsdev,
 144                         st->report_state.report_id,
 145                         st->report_state.index,
 146                         HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM);
 147         }
 148
 149         if (state_val >= 0) {
 150                 state_val += st->power_state.logical_minimum;
 151                 sensor_hub_set_feature(st->hsdev, st->power_state.report_id,
 152                                        st->power_state.index, sizeof(state_val),
 153                                        &state_val);
 154         }
 155
 156         if (report_val >= 0) {
 157                 report_val += st->report_state.logical_minimum;
 158                 sensor_hub_set_feature(st->hsdev, st->report_state.report_id,
 159                                        st->report_state.index,
 160                                        sizeof(report_val),
 161                                        &report_val);
 162         }
 163
 164         sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
 165                                st->power_state.index,
 166                                sizeof(state_val), &state_val);
 167         if (state && poll_value)
 168                 msleep_interruptible(poll_value * 2);
 169
 170         return 0;
 171 }
 172 EXPORT_SYMBOL(hid_sensor_power_state);
 173
 174 int hid_sensor_power_state(struct hid_sensor_common *st, bool state)
 175 {
 176
 177 #ifdef CONFIG_PM
 178         int ret;
 179
 180         atomic_set(&st->user_requested_state, state);
 181         if (state)
 182                 ret = pm_runtime_get_sync(&st->pdev->dev);
 183         else {
 184                 pm_runtime_mark_last_busy(&st->pdev->dev);
 185                 ret = pm_runtime_put_autosuspend(&st->pdev->dev);
 186         }
 187         if (ret < 0) {
 188                 if (state)
 189                         pm_runtime_put_noidle(&st->pdev->dev);
 190                 return ret;
 191         }
 192
 193         return 0;
 194 #else
 195         atomic_set(&st->user_requested_state, state);
 196         return _hid_sensor_power_state(st, state);
 197 #endif
 198 }
 199
 200 static void hid_sensor_set_power_work(struct work_struct *work)
 201 {
 202         struct hid_sensor_common *attrb = container_of(work,
 203                                                        struct hid_sensor_common,
 204                                                        work);
 205
 206         if (attrb->poll_interval >= 0)
 207                 sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
 208                                        attrb->poll.index,
 209                                        sizeof(attrb->poll_interval),
 210                                        &attrb->poll_interval);
 211
 212         if (attrb->raw_hystersis >= 0)
 213                 sensor_hub_set_feature(attrb->hsdev,
 214                                        attrb->sensitivity.report_id,
 215                                        attrb->sensitivity.index,
 216                                        sizeof(attrb->raw_hystersis),
 217                                        &attrb->raw_hystersis);
 218
 219         if (attrb->latency_ms > 0)
 220                 hid_sensor_set_report_latency(attrb, attrb->latency_ms);
 221
 222         _hid_sensor_power_state(attrb, true);
 223 }
 224
 225 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
 226                                                 bool state)
 227 {
 228         return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state);
 229 }
 230
 231 void hid_sensor_remove_trigger(struct hid_sensor_common *attrb)
 232 {
 233         pm_runtime_disable(&attrb->pdev->dev);
 234         pm_runtime_set_suspended(&attrb->pdev->dev);
 235         pm_runtime_put_noidle(&attrb->pdev->dev);
 236
 237         cancel_work_sync(&attrb->work);
 238         iio_trigger_unregister(attrb->trigger);
 239         iio_trigger_free(attrb->trigger);
 240 }
 241 EXPORT_SYMBOL(hid_sensor_remove_trigger);
 242
 243 static const struct iio_trigger_ops hid_sensor_trigger_ops = {
 244         .owner = THIS_MODULE,
 245         .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state,
 246 };
 247
 248 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
 249                                 struct hid_sensor_common *attrb)
 250 {
 251         int ret;
 252         struct iio_trigger *trig;
 253
 254         trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
 255         if (trig == NULL) {
 256                 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n");
 257                 ret = -ENOMEM;
 258                 goto error_ret;
 259         }
 260
 261         trig->dev.parent = indio_dev->dev.parent;
 262         iio_trigger_set_drvdata(trig, attrb);
 263         trig->ops = &hid_sensor_trigger_ops;
 264         ret = iio_trigger_register(trig);
 265
 266         if (ret) {
 267                 dev_err(&indio_dev->dev, "Trigger Register Failed\n");
 268                 goto error_free_trig;
 269         }
 270         attrb->trigger = trig;
 271         indio_dev->trig = iio_trigger_get(trig);
 272
 273         hid_sensor_setup_batch_mode(indio_dev, attrb);
 274
 275         ret = pm_runtime_set_active(&indio_dev->dev);
 276         if (ret)
 277                 goto error_unreg_trigger;
 278
 279         iio_device_set_drvdata(indio_dev, attrb);
 280
 281         INIT_WORK(&attrb->work, hid_sensor_set_power_work);
 282
 283         pm_suspend_ignore_children(&attrb->pdev->dev, true);
 284         pm_runtime_enable(&attrb->pdev->dev);
 285         /* Default to 3 seconds, but can be changed from sysfs */
 286         pm_runtime_set_autosuspend_delay(&attrb->pdev->dev,
 287                                          3000);
 288         pm_runtime_use_autosuspend(&attrb->pdev->dev);
 289
 290         return ret;
 291 error_unreg_trigger:
 292         iio_trigger_unregister(trig);
 293 error_free_trig:
 294         iio_trigger_free(trig);
 295 error_ret:
 296         return ret;
 297 }
 298 EXPORT_SYMBOL(hid_sensor_setup_trigger);
 299
 300 static int __maybe_unused hid_sensor_suspend(struct device *dev)
 301 {
 302         struct platform_device *pdev = to_platform_device(dev);
 303         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 304         struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
 305
 306         return _hid_sensor_power_state(attrb, false);
 307 }
 308
 309 static int __maybe_unused hid_sensor_resume(struct device *dev)
 310 {
 311         struct platform_device *pdev = to_platform_device(dev);
 312         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 313         struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
 314         schedule_work(&attrb->work);
 315         return 0;
 316 }
 317
 318 static int __maybe_unused hid_sensor_runtime_resume(struct device *dev)
 319 {
 320         struct platform_device *pdev = to_platform_device(dev);
 321         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 322         struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev);
 323         return _hid_sensor_power_state(attrb, true);
 324 }
 325
 326 const struct dev_pm_ops hid_sensor_pm_ops = {
 327         SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume)
 328         SET_RUNTIME_PM_OPS(hid_sensor_suspend,
 329                            hid_sensor_runtime_resume, NULL)
 330 };
 331 EXPORT_SYMBOL(hid_sensor_pm_ops);
 332
 333 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 334 MODULE_DESCRIPTION("HID Sensor trigger processing");
 335 MODULE_LICENSE("GPL");