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/sysfs.h> 29 #include <linux/iio/buffer.h> 30 #include <linux/iio/trigger_consumer.h> 31 #include <linux/iio/triggered_buffer.h> 32 #include "../common/hid-sensors/hid-sensor-trigger.h" 33 34 enum accel_3d_channel { 35 CHANNEL_SCAN_INDEX_X, 36 CHANNEL_SCAN_INDEX_Y, 37 CHANNEL_SCAN_INDEX_Z, 38 ACCEL_3D_CHANNEL_MAX, 39 }; 40 41 struct accel_3d_state { 42 struct hid_sensor_hub_callbacks callbacks; 43 struct hid_sensor_common common_attributes; 44 struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX]; 45 /* Reserve for 3 channels + padding + timestamp */ 46 u32 accel_val[ACCEL_3D_CHANNEL_MAX + 3]; 47 int scale_pre_decml; 48 int scale_post_decml; 49 int scale_precision; 50 int value_offset; 51 int64_t timestamp; 52 }; 53 54 static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = { 55 HID_USAGE_SENSOR_ACCEL_X_AXIS, 56 HID_USAGE_SENSOR_ACCEL_Y_AXIS, 57 HID_USAGE_SENSOR_ACCEL_Z_AXIS 58 }; 59 60 /* Channel definitions */ 61 static const struct iio_chan_spec accel_3d_channels[] = { 62 { 63 .type = IIO_ACCEL, 64 .modified = 1, 65 .channel2 = IIO_MOD_X, 66 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 67 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 68 BIT(IIO_CHAN_INFO_SCALE) | 69 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 70 BIT(IIO_CHAN_INFO_HYSTERESIS), 71 .scan_index = CHANNEL_SCAN_INDEX_X, 72 }, { 73 .type = IIO_ACCEL, 74 .modified = 1, 75 .channel2 = IIO_MOD_Y, 76 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 77 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 78 BIT(IIO_CHAN_INFO_SCALE) | 79 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 80 BIT(IIO_CHAN_INFO_HYSTERESIS), 81 .scan_index = CHANNEL_SCAN_INDEX_Y, 82 }, { 83 .type = IIO_ACCEL, 84 .modified = 1, 85 .channel2 = IIO_MOD_Z, 86 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 87 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 88 BIT(IIO_CHAN_INFO_SCALE) | 89 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 90 BIT(IIO_CHAN_INFO_HYSTERESIS), 91 .scan_index = CHANNEL_SCAN_INDEX_Z, 92 }, 93 IIO_CHAN_SOFT_TIMESTAMP(3) 94 }; 95 96 /* Channel definitions */ 97 static const struct iio_chan_spec gravity_channels[] = { 98 { 99 .type = IIO_GRAVITY, 100 .modified = 1, 101 .channel2 = IIO_MOD_X, 102 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 103 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 104 BIT(IIO_CHAN_INFO_SCALE) | 105 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 106 BIT(IIO_CHAN_INFO_HYSTERESIS), 107 .scan_index = CHANNEL_SCAN_INDEX_X, 108 }, { 109 .type = IIO_GRAVITY, 110 .modified = 1, 111 .channel2 = IIO_MOD_Y, 112 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 113 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 114 BIT(IIO_CHAN_INFO_SCALE) | 115 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 116 BIT(IIO_CHAN_INFO_HYSTERESIS), 117 .scan_index = CHANNEL_SCAN_INDEX_Y, 118 }, { 119 .type = IIO_GRAVITY, 120 .modified = 1, 121 .channel2 = IIO_MOD_Z, 122 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 123 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 124 BIT(IIO_CHAN_INFO_SCALE) | 125 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 126 BIT(IIO_CHAN_INFO_HYSTERESIS), 127 .scan_index = CHANNEL_SCAN_INDEX_Z, 128 } 129 }; 130 131 /* Adjust channel real bits based on report descriptor */ 132 static void accel_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels, 133 int channel, int size) 134 { 135 channels[channel].scan_type.sign = 's'; 136 /* Real storage bits will change based on the report desc. */ 137 channels[channel].scan_type.realbits = size * 8; 138 /* Maximum size of a sample to capture is u32 */ 139 channels[channel].scan_type.storagebits = sizeof(u32) * 8; 140 } 141 142 /* Channel read_raw handler */ 143 static int accel_3d_read_raw(struct iio_dev *indio_dev, 144 struct iio_chan_spec const *chan, 145 int *val, int *val2, 146 long mask) 147 { 148 struct accel_3d_state *accel_state = iio_priv(indio_dev); 149 int report_id = -1; 150 u32 address; 151 int ret_type; 152 struct hid_sensor_hub_device *hsdev = 153 accel_state->common_attributes.hsdev; 154 155 *val = 0; 156 *val2 = 0; 157 switch (mask) { 158 case 0: 159 hid_sensor_power_state(&accel_state->common_attributes, true); 160 report_id = accel_state->accel[chan->scan_index].report_id; 161 address = accel_3d_addresses[chan->scan_index]; 162 if (report_id >= 0) 163 *val = sensor_hub_input_attr_get_raw_value( 164 accel_state->common_attributes.hsdev, 165 hsdev->usage, address, report_id, 166 SENSOR_HUB_SYNC); 167 else { 168 *val = 0; 169 hid_sensor_power_state(&accel_state->common_attributes, 170 false); 171 return -EINVAL; 172 } 173 hid_sensor_power_state(&accel_state->common_attributes, false); 174 ret_type = IIO_VAL_INT; 175 break; 176 case IIO_CHAN_INFO_SCALE: 177 *val = accel_state->scale_pre_decml; 178 *val2 = accel_state->scale_post_decml; 179 ret_type = accel_state->scale_precision; 180 break; 181 case IIO_CHAN_INFO_OFFSET: 182 *val = accel_state->value_offset; 183 ret_type = IIO_VAL_INT; 184 break; 185 case IIO_CHAN_INFO_SAMP_FREQ: 186 ret_type = hid_sensor_read_samp_freq_value( 187 &accel_state->common_attributes, val, val2); 188 break; 189 case IIO_CHAN_INFO_HYSTERESIS: 190 ret_type = hid_sensor_read_raw_hyst_value( 191 &accel_state->common_attributes, val, val2); 192 break; 193 default: 194 ret_type = -EINVAL; 195 break; 196 } 197 198 return ret_type; 199 } 200 201 /* Channel write_raw handler */ 202 static int accel_3d_write_raw(struct iio_dev *indio_dev, 203 struct iio_chan_spec const *chan, 204 int val, 205 int val2, 206 long mask) 207 { 208 struct accel_3d_state *accel_state = iio_priv(indio_dev); 209 int ret = 0; 210 211 switch (mask) { 212 case IIO_CHAN_INFO_SAMP_FREQ: 213 ret = hid_sensor_write_samp_freq_value( 214 &accel_state->common_attributes, val, val2); 215 break; 216 case IIO_CHAN_INFO_HYSTERESIS: 217 ret = hid_sensor_write_raw_hyst_value( 218 &accel_state->common_attributes, val, val2); 219 break; 220 default: 221 ret = -EINVAL; 222 } 223 224 return ret; 225 } 226 227 static const struct iio_info accel_3d_info = { 228 .driver_module = THIS_MODULE, 229 .read_raw = &accel_3d_read_raw, 230 .write_raw = &accel_3d_write_raw, 231 }; 232 233 /* Function to push data to buffer */ 234 static void hid_sensor_push_data(struct iio_dev *indio_dev, void *data, 235 int len, int64_t timestamp) 236 { 237 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 238 iio_push_to_buffers_with_timestamp(indio_dev, data, timestamp); 239 } 240 241 /* Callback handler to send event after all samples are received and captured */ 242 static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev, 243 unsigned usage_id, 244 void *priv) 245 { 246 struct iio_dev *indio_dev = platform_get_drvdata(priv); 247 struct accel_3d_state *accel_state = iio_priv(indio_dev); 248 249 dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n"); 250 if (atomic_read(&accel_state->common_attributes.data_ready)) { 251 if (!accel_state->timestamp) 252 accel_state->timestamp = iio_get_time_ns(indio_dev); 253 254 hid_sensor_push_data(indio_dev, 255 accel_state->accel_val, 256 sizeof(accel_state->accel_val), 257 accel_state->timestamp); 258 259 accel_state->timestamp = 0; 260 } 261 262 return 0; 263 } 264 265 /* Capture samples in local storage */ 266 static int accel_3d_capture_sample(struct hid_sensor_hub_device *hsdev, 267 unsigned usage_id, 268 size_t raw_len, char *raw_data, 269 void *priv) 270 { 271 struct iio_dev *indio_dev = platform_get_drvdata(priv); 272 struct accel_3d_state *accel_state = iio_priv(indio_dev); 273 int offset; 274 int ret = -EINVAL; 275 276 switch (usage_id) { 277 case HID_USAGE_SENSOR_ACCEL_X_AXIS: 278 case HID_USAGE_SENSOR_ACCEL_Y_AXIS: 279 case HID_USAGE_SENSOR_ACCEL_Z_AXIS: 280 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS; 281 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] = 282 *(u32 *)raw_data; 283 ret = 0; 284 break; 285 case HID_USAGE_SENSOR_TIME_TIMESTAMP: 286 accel_state->timestamp = 287 hid_sensor_convert_timestamp( 288 &accel_state->common_attributes, 289 *(int64_t *)raw_data); 290 break; 291 default: 292 break; 293 } 294 295 return ret; 296 } 297 298 /* Parse report which is specific to an usage id*/ 299 static int accel_3d_parse_report(struct platform_device *pdev, 300 struct hid_sensor_hub_device *hsdev, 301 struct iio_chan_spec *channels, 302 unsigned usage_id, 303 struct accel_3d_state *st) 304 { 305 int ret; 306 int i; 307 308 for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) { 309 ret = sensor_hub_input_get_attribute_info(hsdev, 310 HID_INPUT_REPORT, 311 usage_id, 312 HID_USAGE_SENSOR_ACCEL_X_AXIS + i, 313 &st->accel[CHANNEL_SCAN_INDEX_X + i]); 314 if (ret < 0) 315 break; 316 accel_3d_adjust_channel_bit_mask(channels, 317 CHANNEL_SCAN_INDEX_X + i, 318 st->accel[CHANNEL_SCAN_INDEX_X + i].size); 319 } 320 dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n", 321 st->accel[0].index, 322 st->accel[0].report_id, 323 st->accel[1].index, st->accel[1].report_id, 324 st->accel[2].index, st->accel[2].report_id); 325 326 st->scale_precision = hid_sensor_format_scale( 327 hsdev->usage, 328 &st->accel[CHANNEL_SCAN_INDEX_X], 329 &st->scale_pre_decml, &st->scale_post_decml); 330 331 /* Set Sensitivity field ids, when there is no individual modifier */ 332 if (st->common_attributes.sensitivity.index < 0) { 333 sensor_hub_input_get_attribute_info(hsdev, 334 HID_FEATURE_REPORT, usage_id, 335 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | 336 HID_USAGE_SENSOR_DATA_ACCELERATION, 337 &st->common_attributes.sensitivity); 338 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", 339 st->common_attributes.sensitivity.index, 340 st->common_attributes.sensitivity.report_id); 341 } 342 343 return ret; 344 } 345 346 /* Function to initialize the processing for usage id */ 347 static int hid_accel_3d_probe(struct platform_device *pdev) 348 { 349 int ret = 0; 350 const char *name; 351 struct iio_dev *indio_dev; 352 struct accel_3d_state *accel_state; 353 const struct iio_chan_spec *channel_spec; 354 int channel_size; 355 356 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 357 358 indio_dev = devm_iio_device_alloc(&pdev->dev, 359 sizeof(struct accel_3d_state)); 360 if (indio_dev == NULL) 361 return -ENOMEM; 362 363 platform_set_drvdata(pdev, indio_dev); 364 365 accel_state = iio_priv(indio_dev); 366 accel_state->common_attributes.hsdev = hsdev; 367 accel_state->common_attributes.pdev = pdev; 368 369 if (hsdev->usage == HID_USAGE_SENSOR_ACCEL_3D) { 370 name = "accel_3d"; 371 channel_spec = accel_3d_channels; 372 channel_size = sizeof(accel_3d_channels); 373 indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels); 374 } else { 375 name = "gravity"; 376 channel_spec = gravity_channels; 377 channel_size = sizeof(gravity_channels); 378 indio_dev->num_channels = ARRAY_SIZE(gravity_channels); 379 } 380 ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage, 381 &accel_state->common_attributes); 382 if (ret) { 383 dev_err(&pdev->dev, "failed to setup common attributes\n"); 384 return ret; 385 } 386 indio_dev->channels = kmemdup(channel_spec, channel_size, GFP_KERNEL); 387 388 if (!indio_dev->channels) { 389 dev_err(&pdev->dev, "failed to duplicate channels\n"); 390 return -ENOMEM; 391 } 392 ret = accel_3d_parse_report(pdev, hsdev, 393 (struct iio_chan_spec *)indio_dev->channels, 394 hsdev->usage, accel_state); 395 if (ret) { 396 dev_err(&pdev->dev, "failed to setup attributes\n"); 397 goto error_free_dev_mem; 398 } 399 400 indio_dev->dev.parent = &pdev->dev; 401 indio_dev->info = &accel_3d_info; 402 indio_dev->name = name; 403 indio_dev->modes = INDIO_DIRECT_MODE; 404 405 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 406 NULL, NULL); 407 if (ret) { 408 dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); 409 goto error_free_dev_mem; 410 } 411 atomic_set(&accel_state->common_attributes.data_ready, 0); 412 ret = hid_sensor_setup_trigger(indio_dev, name, 413 &accel_state->common_attributes); 414 if (ret < 0) { 415 dev_err(&pdev->dev, "trigger setup failed\n"); 416 goto error_unreg_buffer_funcs; 417 } 418 419 ret = iio_device_register(indio_dev); 420 if (ret) { 421 dev_err(&pdev->dev, "device register failed\n"); 422 goto error_remove_trigger; 423 } 424 425 accel_state->callbacks.send_event = accel_3d_proc_event; 426 accel_state->callbacks.capture_sample = accel_3d_capture_sample; 427 accel_state->callbacks.pdev = pdev; 428 ret = sensor_hub_register_callback(hsdev, hsdev->usage, 429 &accel_state->callbacks); 430 if (ret < 0) { 431 dev_err(&pdev->dev, "callback reg failed\n"); 432 goto error_iio_unreg; 433 } 434 435 return ret; 436 437 error_iio_unreg: 438 iio_device_unregister(indio_dev); 439 error_remove_trigger: 440 hid_sensor_remove_trigger(&accel_state->common_attributes); 441 error_unreg_buffer_funcs: 442 iio_triggered_buffer_cleanup(indio_dev); 443 error_free_dev_mem: 444 kfree(indio_dev->channels); 445 return ret; 446 } 447 448 /* Function to deinitialize the processing for usage id */ 449 static int hid_accel_3d_remove(struct platform_device *pdev) 450 { 451 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 452 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 453 struct accel_3d_state *accel_state = iio_priv(indio_dev); 454 455 sensor_hub_remove_callback(hsdev, hsdev->usage); 456 iio_device_unregister(indio_dev); 457 hid_sensor_remove_trigger(&accel_state->common_attributes); 458 iio_triggered_buffer_cleanup(indio_dev); 459 kfree(indio_dev->channels); 460 461 return 0; 462 } 463 464 static const struct platform_device_id hid_accel_3d_ids[] = { 465 { 466 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 467 .name = "HID-SENSOR-200073", 468 }, 469 { /* gravity sensor */ 470 .name = "HID-SENSOR-20007b", 471 }, 472 { /* sentinel */ } 473 }; 474 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids); 475 476 static struct platform_driver hid_accel_3d_platform_driver = { 477 .id_table = hid_accel_3d_ids, 478 .driver = { 479 .name = KBUILD_MODNAME, 480 .pm = &hid_sensor_pm_ops, 481 }, 482 .probe = hid_accel_3d_probe, 483 .remove = hid_accel_3d_remove, 484 }; 485 module_platform_driver(hid_accel_3d_platform_driver); 486 487 MODULE_DESCRIPTION("HID Sensor Accel 3D"); 488 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 489 MODULE_LICENSE("GPL"); 490