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 attribute *hid_sensor_fifo_attributes[] = { 79 &iio_dev_attr_hwfifo_timeout.dev_attr.attr, 80 &iio_dev_attr_hwfifo_enabled.dev_attr.attr, 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 attribute **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); 328