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"); 338