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 magn_3d_channel { 35 CHANNEL_SCAN_INDEX_X, 36 CHANNEL_SCAN_INDEX_Y, 37 CHANNEL_SCAN_INDEX_Z, 38 CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP, 39 CHANNEL_SCAN_INDEX_NORTH_TRUE_TILT_COMP, 40 CHANNEL_SCAN_INDEX_NORTH_MAGN, 41 CHANNEL_SCAN_INDEX_NORTH_TRUE, 42 MAGN_3D_CHANNEL_MAX, 43 }; 44 45 struct magn_3d_state { 46 struct hid_sensor_hub_callbacks callbacks; 47 struct hid_sensor_common common_attributes; 48 struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX]; 49 50 /* dynamically sized array to hold sensor values */ 51 u32 *iio_vals; 52 /* array of pointers to sensor value */ 53 u32 *magn_val_addr[MAGN_3D_CHANNEL_MAX]; 54 55 int scale_pre_decml; 56 int scale_post_decml; 57 int scale_precision; 58 int value_offset; 59 }; 60 61 static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = { 62 HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS, 63 HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS, 64 HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS, 65 HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH, 66 HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH, 67 HID_USAGE_SENSOR_ORIENT_MAGN_NORTH, 68 HID_USAGE_SENSOR_ORIENT_TRUE_NORTH, 69 }; 70 71 /* Channel definitions */ 72 static const struct iio_chan_spec magn_3d_channels[] = { 73 { 74 .type = IIO_MAGN, 75 .modified = 1, 76 .channel2 = IIO_MOD_X, 77 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 78 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 79 BIT(IIO_CHAN_INFO_SCALE) | 80 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 81 BIT(IIO_CHAN_INFO_HYSTERESIS), 82 }, { 83 .type = IIO_MAGN, 84 .modified = 1, 85 .channel2 = IIO_MOD_Y, 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 }, { 92 .type = IIO_MAGN, 93 .modified = 1, 94 .channel2 = IIO_MOD_Z, 95 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 96 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 97 BIT(IIO_CHAN_INFO_SCALE) | 98 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 99 BIT(IIO_CHAN_INFO_HYSTERESIS), 100 }, { 101 .type = IIO_ROT, 102 .modified = 1, 103 .channel2 = IIO_MOD_NORTH_MAGN_TILT_COMP, 104 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 105 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 106 BIT(IIO_CHAN_INFO_SCALE) | 107 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 108 BIT(IIO_CHAN_INFO_HYSTERESIS), 109 }, { 110 .type = IIO_ROT, 111 .modified = 1, 112 .channel2 = IIO_MOD_NORTH_TRUE_TILT_COMP, 113 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 114 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 115 BIT(IIO_CHAN_INFO_SCALE) | 116 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 117 BIT(IIO_CHAN_INFO_HYSTERESIS), 118 }, { 119 .type = IIO_ROT, 120 .modified = 1, 121 .channel2 = IIO_MOD_NORTH_MAGN, 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 }, { 128 .type = IIO_ROT, 129 .modified = 1, 130 .channel2 = IIO_MOD_NORTH_TRUE, 131 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 132 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 133 BIT(IIO_CHAN_INFO_SCALE) | 134 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 135 BIT(IIO_CHAN_INFO_HYSTERESIS), 136 } 137 }; 138 139 /* Adjust channel real bits based on report descriptor */ 140 static void magn_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels, 141 int channel, int size) 142 { 143 channels[channel].scan_type.sign = 's'; 144 /* Real storage bits will change based on the report desc. */ 145 channels[channel].scan_type.realbits = size * 8; 146 /* Maximum size of a sample to capture is u32 */ 147 channels[channel].scan_type.storagebits = sizeof(u32) * 8; 148 } 149 150 /* Channel read_raw handler */ 151 static int magn_3d_read_raw(struct iio_dev *indio_dev, 152 struct iio_chan_spec const *chan, 153 int *val, int *val2, 154 long mask) 155 { 156 struct magn_3d_state *magn_state = iio_priv(indio_dev); 157 int report_id = -1; 158 u32 address; 159 int ret_type; 160 s32 poll_value; 161 162 *val = 0; 163 *val2 = 0; 164 switch (mask) { 165 case 0: 166 poll_value = hid_sensor_read_poll_value( 167 &magn_state->common_attributes); 168 if (poll_value < 0) 169 return -EINVAL; 170 171 hid_sensor_power_state(&magn_state->common_attributes, true); 172 msleep_interruptible(poll_value * 2); 173 174 report_id = 175 magn_state->magn[chan->address].report_id; 176 address = magn_3d_addresses[chan->address]; 177 if (report_id >= 0) 178 *val = sensor_hub_input_attr_get_raw_value( 179 magn_state->common_attributes.hsdev, 180 HID_USAGE_SENSOR_COMPASS_3D, address, 181 report_id); 182 else { 183 *val = 0; 184 hid_sensor_power_state(&magn_state->common_attributes, 185 false); 186 return -EINVAL; 187 } 188 hid_sensor_power_state(&magn_state->common_attributes, false); 189 ret_type = IIO_VAL_INT; 190 break; 191 case IIO_CHAN_INFO_SCALE: 192 *val = magn_state->scale_pre_decml; 193 *val2 = magn_state->scale_post_decml; 194 ret_type = magn_state->scale_precision; 195 break; 196 case IIO_CHAN_INFO_OFFSET: 197 *val = magn_state->value_offset; 198 ret_type = IIO_VAL_INT; 199 break; 200 case IIO_CHAN_INFO_SAMP_FREQ: 201 ret_type = hid_sensor_read_samp_freq_value( 202 &magn_state->common_attributes, val, val2); 203 break; 204 case IIO_CHAN_INFO_HYSTERESIS: 205 ret_type = hid_sensor_read_raw_hyst_value( 206 &magn_state->common_attributes, val, val2); 207 break; 208 default: 209 ret_type = -EINVAL; 210 break; 211 } 212 213 return ret_type; 214 } 215 216 /* Channel write_raw handler */ 217 static int magn_3d_write_raw(struct iio_dev *indio_dev, 218 struct iio_chan_spec const *chan, 219 int val, 220 int val2, 221 long mask) 222 { 223 struct magn_3d_state *magn_state = iio_priv(indio_dev); 224 int ret = 0; 225 226 switch (mask) { 227 case IIO_CHAN_INFO_SAMP_FREQ: 228 ret = hid_sensor_write_samp_freq_value( 229 &magn_state->common_attributes, val, val2); 230 break; 231 case IIO_CHAN_INFO_HYSTERESIS: 232 ret = hid_sensor_write_raw_hyst_value( 233 &magn_state->common_attributes, val, val2); 234 break; 235 default: 236 ret = -EINVAL; 237 } 238 239 return ret; 240 } 241 242 static const struct iio_info magn_3d_info = { 243 .driver_module = THIS_MODULE, 244 .read_raw = &magn_3d_read_raw, 245 .write_raw = &magn_3d_write_raw, 246 }; 247 248 /* Function to push data to buffer */ 249 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, 250 int len) 251 { 252 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 253 iio_push_to_buffers(indio_dev, data); 254 } 255 256 /* Callback handler to send event after all samples are received and captured */ 257 static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev, 258 unsigned usage_id, 259 void *priv) 260 { 261 struct iio_dev *indio_dev = platform_get_drvdata(priv); 262 struct magn_3d_state *magn_state = iio_priv(indio_dev); 263 264 dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n"); 265 if (atomic_read(&magn_state->common_attributes.data_ready)) 266 hid_sensor_push_data(indio_dev, 267 magn_state->iio_vals, 268 sizeof(magn_state->iio_vals)); 269 270 return 0; 271 } 272 273 /* Capture samples in local storage */ 274 static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev, 275 unsigned usage_id, 276 size_t raw_len, char *raw_data, 277 void *priv) 278 { 279 struct iio_dev *indio_dev = platform_get_drvdata(priv); 280 struct magn_3d_state *magn_state = iio_priv(indio_dev); 281 int offset; 282 int ret = 0; 283 u32 *iio_val = NULL; 284 285 switch (usage_id) { 286 case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS: 287 case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS: 288 case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS: 289 offset = (usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS) 290 + CHANNEL_SCAN_INDEX_X; 291 break; 292 case HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH: 293 case HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH: 294 case HID_USAGE_SENSOR_ORIENT_MAGN_NORTH: 295 case HID_USAGE_SENSOR_ORIENT_TRUE_NORTH: 296 offset = (usage_id - HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH) 297 + CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP; 298 break; 299 default: 300 return -EINVAL; 301 } 302 303 iio_val = magn_state->magn_val_addr[offset]; 304 305 if (iio_val != NULL) 306 *iio_val = *((u32 *)raw_data); 307 else 308 ret = -EINVAL; 309 310 return ret; 311 } 312 313 /* Parse report which is specific to an usage id*/ 314 static int magn_3d_parse_report(struct platform_device *pdev, 315 struct hid_sensor_hub_device *hsdev, 316 struct iio_chan_spec **channels, 317 int *chan_count, 318 unsigned usage_id, 319 struct magn_3d_state *st) 320 { 321 int i; 322 int attr_count = 0; 323 struct iio_chan_spec *_channels; 324 325 /* Scan for each usage attribute supported */ 326 for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) { 327 int status; 328 u32 address = magn_3d_addresses[i]; 329 330 /* Check if usage attribute exists in the sensor hub device */ 331 status = sensor_hub_input_get_attribute_info(hsdev, 332 HID_INPUT_REPORT, 333 usage_id, 334 address, 335 &(st->magn[i])); 336 if (!status) 337 attr_count++; 338 } 339 340 if (attr_count <= 0) { 341 dev_err(&pdev->dev, 342 "failed to find any supported usage attributes in report\n"); 343 return -EINVAL; 344 } 345 346 dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n", 347 attr_count); 348 dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %x:%x\n", 349 st->magn[0].index, 350 st->magn[0].report_id, 351 st->magn[1].index, st->magn[1].report_id, 352 st->magn[2].index, st->magn[2].report_id); 353 354 /* Setup IIO channel array */ 355 _channels = devm_kcalloc(&pdev->dev, attr_count, 356 sizeof(struct iio_chan_spec), 357 GFP_KERNEL); 358 if (!_channels) { 359 dev_err(&pdev->dev, 360 "failed to allocate space for iio channels\n"); 361 return -ENOMEM; 362 } 363 364 st->iio_vals = devm_kcalloc(&pdev->dev, attr_count, 365 sizeof(u32), 366 GFP_KERNEL); 367 if (!st->iio_vals) { 368 dev_err(&pdev->dev, 369 "failed to allocate space for iio values array\n"); 370 return -ENOMEM; 371 } 372 373 for (i = 0, *chan_count = 0; 374 i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count; 375 i++){ 376 if (st->magn[i].index >= 0) { 377 /* Setup IIO channel struct */ 378 (_channels[*chan_count]) = magn_3d_channels[i]; 379 (_channels[*chan_count]).scan_index = *chan_count; 380 (_channels[*chan_count]).address = i; 381 382 /* Set magn_val_addr to iio value address */ 383 st->magn_val_addr[i] = &(st->iio_vals[*chan_count]); 384 magn_3d_adjust_channel_bit_mask(_channels, 385 *chan_count, 386 st->magn[i].size); 387 (*chan_count)++; 388 } 389 } 390 391 if (*chan_count <= 0) { 392 dev_err(&pdev->dev, 393 "failed to find any magnetic channels setup\n"); 394 return -EINVAL; 395 } 396 397 *channels = _channels; 398 399 dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n", 400 *chan_count); 401 402 st->scale_precision = hid_sensor_format_scale( 403 HID_USAGE_SENSOR_COMPASS_3D, 404 &st->magn[CHANNEL_SCAN_INDEX_X], 405 &st->scale_pre_decml, &st->scale_post_decml); 406 407 /* Set Sensitivity field ids, when there is no individual modifier */ 408 if (st->common_attributes.sensitivity.index < 0) { 409 sensor_hub_input_get_attribute_info(hsdev, 410 HID_FEATURE_REPORT, usage_id, 411 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | 412 HID_USAGE_SENSOR_DATA_ORIENTATION, 413 &st->common_attributes.sensitivity); 414 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", 415 st->common_attributes.sensitivity.index, 416 st->common_attributes.sensitivity.report_id); 417 } 418 419 return 0; 420 } 421 422 /* Function to initialize the processing for usage id */ 423 static int hid_magn_3d_probe(struct platform_device *pdev) 424 { 425 int ret = 0; 426 static char *name = "magn_3d"; 427 struct iio_dev *indio_dev; 428 struct magn_3d_state *magn_state; 429 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 430 struct iio_chan_spec *channels; 431 int chan_count = 0; 432 433 indio_dev = devm_iio_device_alloc(&pdev->dev, 434 sizeof(struct magn_3d_state)); 435 if (indio_dev == NULL) 436 return -ENOMEM; 437 438 platform_set_drvdata(pdev, indio_dev); 439 440 magn_state = iio_priv(indio_dev); 441 magn_state->common_attributes.hsdev = hsdev; 442 magn_state->common_attributes.pdev = pdev; 443 444 ret = hid_sensor_parse_common_attributes(hsdev, 445 HID_USAGE_SENSOR_COMPASS_3D, 446 &magn_state->common_attributes); 447 if (ret) { 448 dev_err(&pdev->dev, "failed to setup common attributes\n"); 449 return ret; 450 } 451 452 ret = magn_3d_parse_report(pdev, hsdev, 453 &channels, &chan_count, 454 HID_USAGE_SENSOR_COMPASS_3D, magn_state); 455 if (ret) { 456 dev_err(&pdev->dev, "failed to parse report\n"); 457 return ret; 458 } 459 460 indio_dev->channels = channels; 461 indio_dev->num_channels = chan_count; 462 indio_dev->dev.parent = &pdev->dev; 463 indio_dev->info = &magn_3d_info; 464 indio_dev->name = name; 465 indio_dev->modes = INDIO_DIRECT_MODE; 466 467 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 468 NULL, NULL); 469 if (ret) { 470 dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); 471 return ret; 472 } 473 atomic_set(&magn_state->common_attributes.data_ready, 0); 474 ret = hid_sensor_setup_trigger(indio_dev, name, 475 &magn_state->common_attributes); 476 if (ret < 0) { 477 dev_err(&pdev->dev, "trigger setup failed\n"); 478 goto error_unreg_buffer_funcs; 479 } 480 481 ret = iio_device_register(indio_dev); 482 if (ret) { 483 dev_err(&pdev->dev, "device register failed\n"); 484 goto error_remove_trigger; 485 } 486 487 magn_state->callbacks.send_event = magn_3d_proc_event; 488 magn_state->callbacks.capture_sample = magn_3d_capture_sample; 489 magn_state->callbacks.pdev = pdev; 490 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D, 491 &magn_state->callbacks); 492 if (ret < 0) { 493 dev_err(&pdev->dev, "callback reg failed\n"); 494 goto error_iio_unreg; 495 } 496 497 return ret; 498 499 error_iio_unreg: 500 iio_device_unregister(indio_dev); 501 error_remove_trigger: 502 hid_sensor_remove_trigger(&magn_state->common_attributes); 503 error_unreg_buffer_funcs: 504 iio_triggered_buffer_cleanup(indio_dev); 505 return ret; 506 } 507 508 /* Function to deinitialize the processing for usage id */ 509 static int hid_magn_3d_remove(struct platform_device *pdev) 510 { 511 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 512 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 513 struct magn_3d_state *magn_state = iio_priv(indio_dev); 514 515 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D); 516 iio_device_unregister(indio_dev); 517 hid_sensor_remove_trigger(&magn_state->common_attributes); 518 iio_triggered_buffer_cleanup(indio_dev); 519 520 return 0; 521 } 522 523 static struct platform_device_id hid_magn_3d_ids[] = { 524 { 525 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 526 .name = "HID-SENSOR-200083", 527 }, 528 { /* sentinel */ } 529 }; 530 MODULE_DEVICE_TABLE(platform, hid_magn_3d_ids); 531 532 static struct platform_driver hid_magn_3d_platform_driver = { 533 .id_table = hid_magn_3d_ids, 534 .driver = { 535 .name = KBUILD_MODNAME, 536 .owner = THIS_MODULE, 537 }, 538 .probe = hid_magn_3d_probe, 539 .remove = hid_magn_3d_remove, 540 }; 541 module_platform_driver(hid_magn_3d_platform_driver); 542 543 MODULE_DESCRIPTION("HID Sensor Magnetometer 3D"); 544 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 545 MODULE_LICENSE("GPL"); 546