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/interrupt.h> 10#include <linux/irq.h> 11#include <linux/slab.h> 12#include <linux/delay.h> 13#include <linux/hid-sensor-hub.h> 14#include <linux/iio/iio.h> 15#include <linux/iio/trigger.h> 16#include <linux/iio/triggered_buffer.h> 17#include <linux/iio/trigger_consumer.h> 18#include <linux/iio/buffer.h> 19#include <linux/iio/sysfs.h> 20#include "hid-sensor-trigger.h" 21 22static ssize_t _hid_sensor_set_report_latency(struct device *dev, 23 struct device_attribute *attr, 24 const char *buf, size_t len) 25{ 26 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 27 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 28 int integer, fract, ret; 29 int latency; 30 31 ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract); 32 if (ret) 33 return ret; 34 35 latency = integer * 1000 + fract / 1000; 36 ret = hid_sensor_set_report_latency(attrb, latency); 37 if (ret < 0) 38 return len; 39 40 attrb->latency_ms = hid_sensor_get_report_latency(attrb); 41 42 return len; 43} 44 45static ssize_t _hid_sensor_get_report_latency(struct device *dev, 46 struct device_attribute *attr, 47 char *buf) 48{ 49 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 50 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 51 int latency; 52 53 latency = hid_sensor_get_report_latency(attrb); 54 if (latency < 0) 55 return latency; 56 57 return sprintf(buf, "%d.%06u\n", latency / 1000, (latency % 1000) * 1000); 58} 59 60static ssize_t _hid_sensor_get_fifo_state(struct device *dev, 61 struct device_attribute *attr, 62 char *buf) 63{ 64 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 65 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 66 int latency; 67 68 latency = hid_sensor_get_report_latency(attrb); 69 if (latency < 0) 70 return latency; 71 72 return sprintf(buf, "%d\n", !!latency); 73} 74 75static IIO_DEVICE_ATTR(hwfifo_timeout, 0644, 76 _hid_sensor_get_report_latency, 77 _hid_sensor_set_report_latency, 0); 78static IIO_DEVICE_ATTR(hwfifo_enabled, 0444, 79 _hid_sensor_get_fifo_state, NULL, 0); 80 81static const struct attribute *hid_sensor_fifo_attributes[] = { 82 &iio_dev_attr_hwfifo_timeout.dev_attr.attr, 83 &iio_dev_attr_hwfifo_enabled.dev_attr.attr, 84 NULL, 85}; 86 87static void hid_sensor_setup_batch_mode(struct iio_dev *indio_dev, 88 struct hid_sensor_common *st) 89{ 90 if (!hid_sensor_batch_mode_supported(st)) 91 return; 92 93 iio_buffer_set_attrs(indio_dev->buffer, hid_sensor_fifo_attributes); 94} 95 96static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state) 97{ 98 int state_val; 99 int report_val; 100 s32 poll_value = 0; 101 102 if (state) { 103 if (sensor_hub_device_open(st->hsdev)) 104 return -EIO; 105 106 atomic_inc(&st->data_ready); 107 108 state_val = hid_sensor_get_usage_index(st->hsdev, 109 st->power_state.report_id, 110 st->power_state.index, 111 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM); 112 report_val = hid_sensor_get_usage_index(st->hsdev, 113 st->report_state.report_id, 114 st->report_state.index, 115 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM); 116 117 poll_value = hid_sensor_read_poll_value(st); 118 } else { 119 int val; 120 121 val = atomic_dec_if_positive(&st->data_ready); 122 if (val < 0) 123 return 0; 124 125 sensor_hub_device_close(st->hsdev); 126 state_val = hid_sensor_get_usage_index(st->hsdev, 127 st->power_state.report_id, 128 st->power_state.index, 129 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM); 130 report_val = hid_sensor_get_usage_index(st->hsdev, 131 st->report_state.report_id, 132 st->report_state.index, 133 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM); 134 } 135 136 if (state_val >= 0) { 137 state_val += st->power_state.logical_minimum; 138 sensor_hub_set_feature(st->hsdev, st->power_state.report_id, 139 st->power_state.index, sizeof(state_val), 140 &state_val); 141 } 142 143 if (report_val >= 0) { 144 report_val += st->report_state.logical_minimum; 145 sensor_hub_set_feature(st->hsdev, st->report_state.report_id, 146 st->report_state.index, 147 sizeof(report_val), 148 &report_val); 149 } 150 151 pr_debug("HID_SENSOR %s set power_state %d report_state %d\n", 152 st->pdev->name, state_val, report_val); 153 154 sensor_hub_get_feature(st->hsdev, st->power_state.report_id, 155 st->power_state.index, 156 sizeof(state_val), &state_val); 157 if (state && poll_value) 158 msleep_interruptible(poll_value * 2); 159 160 return 0; 161} 162EXPORT_SYMBOL(hid_sensor_power_state); 163 164int hid_sensor_power_state(struct hid_sensor_common *st, bool state) 165{ 166 167#ifdef CONFIG_PM 168 int ret; 169 170 if (atomic_add_unless(&st->runtime_pm_enable, 1, 1)) 171 pm_runtime_enable(&st->pdev->dev); 172 173 if (state) { 174 atomic_inc(&st->user_requested_state); 175 ret = pm_runtime_get_sync(&st->pdev->dev); 176 } else { 177 atomic_dec(&st->user_requested_state); 178 pm_runtime_mark_last_busy(&st->pdev->dev); 179 pm_runtime_use_autosuspend(&st->pdev->dev); 180 ret = pm_runtime_put_autosuspend(&st->pdev->dev); 181 } 182 if (ret < 0) { 183 if (state) 184 pm_runtime_put_noidle(&st->pdev->dev); 185 return ret; 186 } 187 188 return 0; 189#else 190 atomic_set(&st->user_requested_state, state); 191 return _hid_sensor_power_state(st, state); 192#endif 193} 194 195static void hid_sensor_set_power_work(struct work_struct *work) 196{ 197 struct hid_sensor_common *attrb = container_of(work, 198 struct hid_sensor_common, 199 work); 200 201 if (attrb->poll_interval >= 0) 202 sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id, 203 attrb->poll.index, 204 sizeof(attrb->poll_interval), 205 &attrb->poll_interval); 206 207 if (attrb->raw_hystersis >= 0) 208 sensor_hub_set_feature(attrb->hsdev, 209 attrb->sensitivity.report_id, 210 attrb->sensitivity.index, 211 sizeof(attrb->raw_hystersis), 212 &attrb->raw_hystersis); 213 214 if (attrb->latency_ms > 0) 215 hid_sensor_set_report_latency(attrb, attrb->latency_ms); 216 217 if (atomic_read(&attrb->user_requested_state)) 218 _hid_sensor_power_state(attrb, true); 219} 220 221static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig, 222 bool state) 223{ 224 return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state); 225} 226 227void hid_sensor_remove_trigger(struct iio_dev *indio_dev, 228 struct hid_sensor_common *attrb) 229{ 230 if (atomic_read(&attrb->runtime_pm_enable)) 231 pm_runtime_disable(&attrb->pdev->dev); 232 233 pm_runtime_set_suspended(&attrb->pdev->dev); 234 pm_runtime_put_noidle(&attrb->pdev->dev); 235 236 cancel_work_sync(&attrb->work); 237 iio_trigger_unregister(attrb->trigger); 238 iio_trigger_free(attrb->trigger); 239 iio_triggered_buffer_cleanup(indio_dev); 240} 241EXPORT_SYMBOL(hid_sensor_remove_trigger); 242 243static const struct iio_trigger_ops hid_sensor_trigger_ops = { 244 .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state, 245}; 246 247int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name, 248 struct hid_sensor_common *attrb) 249{ 250 int ret; 251 struct iio_trigger *trig; 252 253 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 254 NULL, NULL); 255 if (ret) { 256 dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n"); 257 return ret; 258 } 259 260 trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id); 261 if (trig == NULL) { 262 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n"); 263 ret = -ENOMEM; 264 goto error_triggered_buffer_cleanup; 265 } 266 267 trig->dev.parent = indio_dev->dev.parent; 268 iio_trigger_set_drvdata(trig, attrb); 269 trig->ops = &hid_sensor_trigger_ops; 270 ret = iio_trigger_register(trig); 271 272 if (ret) { 273 dev_err(&indio_dev->dev, "Trigger Register Failed\n"); 274 goto error_free_trig; 275 } 276 attrb->trigger = trig; 277 indio_dev->trig = iio_trigger_get(trig); 278 279 hid_sensor_setup_batch_mode(indio_dev, attrb); 280 281 ret = pm_runtime_set_active(&indio_dev->dev); 282 if (ret) 283 goto error_unreg_trigger; 284 285 iio_device_set_drvdata(indio_dev, attrb); 286 287 INIT_WORK(&attrb->work, hid_sensor_set_power_work); 288 289 pm_suspend_ignore_children(&attrb->pdev->dev, true); 290 /* Default to 3 seconds, but can be changed from sysfs */ 291 pm_runtime_set_autosuspend_delay(&attrb->pdev->dev, 292 3000); 293 return ret; 294error_unreg_trigger: 295 iio_trigger_unregister(trig); 296error_free_trig: 297 iio_trigger_free(trig); 298error_triggered_buffer_cleanup: 299 iio_triggered_buffer_cleanup(indio_dev); 300 return ret; 301} 302EXPORT_SYMBOL(hid_sensor_setup_trigger); 303 304static int __maybe_unused hid_sensor_suspend(struct device *dev) 305{ 306 struct iio_dev *indio_dev = dev_get_drvdata(dev); 307 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 308 309 return _hid_sensor_power_state(attrb, false); 310} 311 312static int __maybe_unused hid_sensor_resume(struct device *dev) 313{ 314 struct iio_dev *indio_dev = dev_get_drvdata(dev); 315 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 316 schedule_work(&attrb->work); 317 return 0; 318} 319 320static int __maybe_unused hid_sensor_runtime_resume(struct device *dev) 321{ 322 struct iio_dev *indio_dev = dev_get_drvdata(dev); 323 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 324 return _hid_sensor_power_state(attrb, true); 325} 326 327const struct dev_pm_ops hid_sensor_pm_ops = { 328 SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume) 329 SET_RUNTIME_PM_OPS(hid_sensor_suspend, 330 hid_sensor_runtime_resume, NULL) 331}; 332EXPORT_SYMBOL(hid_sensor_pm_ops); 333 334MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 335MODULE_DESCRIPTION("HID Sensor trigger processing"); 336MODULE_LICENSE("GPL"); 337