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"); 336