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 22 static 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 45 static 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 60 static 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 75 static IIO_DEVICE_ATTR(hwfifo_timeout, 0644, 76 _hid_sensor_get_report_latency, 77 _hid_sensor_set_report_latency, 0); 78 static IIO_DEVICE_ATTR(hwfifo_enabled, 0444, 79 _hid_sensor_get_fifo_state, NULL, 0); 80 81 static 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 87 static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state) 88 { 89 int state_val; 90 int report_val; 91 s32 poll_value = 0; 92 93 if (state) { 94 if (sensor_hub_device_open(st->hsdev)) 95 return -EIO; 96 97 atomic_inc(&st->data_ready); 98 99 state_val = hid_sensor_get_usage_index(st->hsdev, 100 st->power_state.report_id, 101 st->power_state.index, 102 HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM); 103 report_val = hid_sensor_get_usage_index(st->hsdev, 104 st->report_state.report_id, 105 st->report_state.index, 106 HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM); 107 108 poll_value = hid_sensor_read_poll_value(st); 109 } else { 110 int val; 111 112 val = atomic_dec_if_positive(&st->data_ready); 113 if (val < 0) 114 return 0; 115 116 sensor_hub_device_close(st->hsdev); 117 state_val = hid_sensor_get_usage_index(st->hsdev, 118 st->power_state.report_id, 119 st->power_state.index, 120 HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM); 121 report_val = hid_sensor_get_usage_index(st->hsdev, 122 st->report_state.report_id, 123 st->report_state.index, 124 HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM); 125 } 126 127 if (state_val >= 0) { 128 state_val += st->power_state.logical_minimum; 129 sensor_hub_set_feature(st->hsdev, st->power_state.report_id, 130 st->power_state.index, sizeof(state_val), 131 &state_val); 132 } 133 134 if (report_val >= 0) { 135 report_val += st->report_state.logical_minimum; 136 sensor_hub_set_feature(st->hsdev, st->report_state.report_id, 137 st->report_state.index, 138 sizeof(report_val), 139 &report_val); 140 } 141 142 pr_debug("HID_SENSOR %s set power_state %d report_state %d\n", 143 st->pdev->name, state_val, report_val); 144 145 sensor_hub_get_feature(st->hsdev, st->power_state.report_id, 146 st->power_state.index, 147 sizeof(state_val), &state_val); 148 if (state && poll_value) 149 msleep_interruptible(poll_value * 2); 150 151 return 0; 152 } 153 EXPORT_SYMBOL(hid_sensor_power_state); 154 155 int hid_sensor_power_state(struct hid_sensor_common *st, bool state) 156 { 157 158 #ifdef CONFIG_PM 159 int ret; 160 161 if (atomic_add_unless(&st->runtime_pm_enable, 1, 1)) 162 pm_runtime_enable(&st->pdev->dev); 163 164 if (state) { 165 atomic_inc(&st->user_requested_state); 166 ret = pm_runtime_get_sync(&st->pdev->dev); 167 } else { 168 atomic_dec(&st->user_requested_state); 169 pm_runtime_mark_last_busy(&st->pdev->dev); 170 pm_runtime_use_autosuspend(&st->pdev->dev); 171 ret = pm_runtime_put_autosuspend(&st->pdev->dev); 172 } 173 if (ret < 0) { 174 if (state) 175 pm_runtime_put_noidle(&st->pdev->dev); 176 return ret; 177 } 178 179 return 0; 180 #else 181 atomic_set(&st->user_requested_state, state); 182 return _hid_sensor_power_state(st, state); 183 #endif 184 } 185 186 static void hid_sensor_set_power_work(struct work_struct *work) 187 { 188 struct hid_sensor_common *attrb = container_of(work, 189 struct hid_sensor_common, 190 work); 191 192 if (attrb->poll_interval >= 0) 193 sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id, 194 attrb->poll.index, 195 sizeof(attrb->poll_interval), 196 &attrb->poll_interval); 197 198 if (attrb->raw_hystersis >= 0) 199 sensor_hub_set_feature(attrb->hsdev, 200 attrb->sensitivity.report_id, 201 attrb->sensitivity.index, 202 sizeof(attrb->raw_hystersis), 203 &attrb->raw_hystersis); 204 205 if (attrb->latency_ms > 0) 206 hid_sensor_set_report_latency(attrb, attrb->latency_ms); 207 208 if (atomic_read(&attrb->user_requested_state)) 209 _hid_sensor_power_state(attrb, true); 210 } 211 212 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig, 213 bool state) 214 { 215 return hid_sensor_power_state(iio_trigger_get_drvdata(trig), state); 216 } 217 218 void hid_sensor_remove_trigger(struct iio_dev *indio_dev, 219 struct hid_sensor_common *attrb) 220 { 221 if (atomic_read(&attrb->runtime_pm_enable)) 222 pm_runtime_disable(&attrb->pdev->dev); 223 224 pm_runtime_set_suspended(&attrb->pdev->dev); 225 pm_runtime_put_noidle(&attrb->pdev->dev); 226 227 cancel_work_sync(&attrb->work); 228 iio_trigger_unregister(attrb->trigger); 229 iio_trigger_free(attrb->trigger); 230 iio_triggered_buffer_cleanup(indio_dev); 231 } 232 EXPORT_SYMBOL(hid_sensor_remove_trigger); 233 234 static const struct iio_trigger_ops hid_sensor_trigger_ops = { 235 .set_trigger_state = &hid_sensor_data_rdy_trigger_set_state, 236 }; 237 238 int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name, 239 struct hid_sensor_common *attrb) 240 { 241 const struct attribute **fifo_attrs; 242 int ret; 243 struct iio_trigger *trig; 244 245 if (hid_sensor_batch_mode_supported(attrb)) 246 fifo_attrs = hid_sensor_fifo_attributes; 247 else 248 fifo_attrs = NULL; 249 250 ret = iio_triggered_buffer_setup_ext(indio_dev, 251 &iio_pollfunc_store_time, 252 NULL, NULL, fifo_attrs); 253 if (ret) { 254 dev_err(&indio_dev->dev, "Triggered Buffer Setup Failed\n"); 255 return ret; 256 } 257 258 trig = iio_trigger_alloc("%s-dev%d", name, indio_dev->id); 259 if (trig == NULL) { 260 dev_err(&indio_dev->dev, "Trigger Allocate Failed\n"); 261 ret = -ENOMEM; 262 goto error_triggered_buffer_cleanup; 263 } 264 265 trig->dev.parent = indio_dev->dev.parent; 266 iio_trigger_set_drvdata(trig, attrb); 267 trig->ops = &hid_sensor_trigger_ops; 268 ret = iio_trigger_register(trig); 269 270 if (ret) { 271 dev_err(&indio_dev->dev, "Trigger Register Failed\n"); 272 goto error_free_trig; 273 } 274 attrb->trigger = trig; 275 indio_dev->trig = iio_trigger_get(trig); 276 277 ret = pm_runtime_set_active(&indio_dev->dev); 278 if (ret) 279 goto error_unreg_trigger; 280 281 iio_device_set_drvdata(indio_dev, attrb); 282 283 INIT_WORK(&attrb->work, hid_sensor_set_power_work); 284 285 pm_suspend_ignore_children(&attrb->pdev->dev, true); 286 /* Default to 3 seconds, but can be changed from sysfs */ 287 pm_runtime_set_autosuspend_delay(&attrb->pdev->dev, 288 3000); 289 return ret; 290 error_unreg_trigger: 291 iio_trigger_unregister(trig); 292 error_free_trig: 293 iio_trigger_free(trig); 294 error_triggered_buffer_cleanup: 295 iio_triggered_buffer_cleanup(indio_dev); 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 iio_dev *indio_dev = dev_get_drvdata(dev); 303 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 304 305 return _hid_sensor_power_state(attrb, false); 306 } 307 308 static int __maybe_unused hid_sensor_resume(struct device *dev) 309 { 310 struct iio_dev *indio_dev = dev_get_drvdata(dev); 311 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 312 schedule_work(&attrb->work); 313 return 0; 314 } 315 316 static int __maybe_unused hid_sensor_runtime_resume(struct device *dev) 317 { 318 struct iio_dev *indio_dev = dev_get_drvdata(dev); 319 struct hid_sensor_common *attrb = iio_device_get_drvdata(indio_dev); 320 return _hid_sensor_power_state(attrb, true); 321 } 322 323 const struct dev_pm_ops hid_sensor_pm_ops = { 324 SET_SYSTEM_SLEEP_PM_OPS(hid_sensor_suspend, hid_sensor_resume) 325 SET_RUNTIME_PM_OPS(hid_sensor_suspend, 326 hid_sensor_runtime_resume, NULL) 327 }; 328 EXPORT_SYMBOL(hid_sensor_pm_ops); 329 330 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 331 MODULE_DESCRIPTION("HID Sensor trigger processing"); 332 MODULE_LICENSE("GPL"); 333