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/mod_devicetable.h>
10 #include <linux/hid-sensor-hub.h>
11 #include <linux/iio/iio.h>
12 #include <linux/iio/buffer.h>
13 #include "../common/hid-sensors/hid-sensor-trigger.h"
14 
15 enum magn_3d_channel {
16 	CHANNEL_SCAN_INDEX_X,
17 	CHANNEL_SCAN_INDEX_Y,
18 	CHANNEL_SCAN_INDEX_Z,
19 	CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP,
20 	CHANNEL_SCAN_INDEX_NORTH_TRUE_TILT_COMP,
21 	CHANNEL_SCAN_INDEX_NORTH_MAGN,
22 	CHANNEL_SCAN_INDEX_NORTH_TRUE,
23 	CHANNEL_SCAN_INDEX_TIMESTAMP,
24 	MAGN_3D_CHANNEL_MAX,
25 };
26 
27 struct common_attributes {
28 	int scale_pre_decml;
29 	int scale_post_decml;
30 	int scale_precision;
31 	int value_offset;
32 };
33 
34 struct magn_3d_state {
35 	struct hid_sensor_hub_callbacks callbacks;
36 	struct hid_sensor_common magn_flux_attributes;
37 	struct hid_sensor_common rot_attributes;
38 	struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
39 
40 	/* dynamically sized array to hold sensor values */
41 	u32 *iio_vals;
42 	/* array of pointers to sensor value */
43 	u32 *magn_val_addr[MAGN_3D_CHANNEL_MAX];
44 
45 	struct common_attributes magn_flux_attr;
46 	struct common_attributes rot_attr;
47 	s64 timestamp;
48 };
49 
50 static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
51 	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS,
52 	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS,
53 	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS,
54 	HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
55 	HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH,
56 	HID_USAGE_SENSOR_ORIENT_MAGN_NORTH,
57 	HID_USAGE_SENSOR_ORIENT_TRUE_NORTH,
58 	HID_USAGE_SENSOR_TIME_TIMESTAMP,
59 };
60 
61 static const u32 magn_3d_sensitivity_addresses[] = {
62 	HID_USAGE_SENSOR_DATA_ORIENTATION,
63 	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX,
64 };
65 
66 /* Channel definitions */
67 static const struct iio_chan_spec magn_3d_channels[] = {
68 	{
69 		.type = IIO_MAGN,
70 		.modified = 1,
71 		.channel2 = IIO_MOD_X,
72 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
73 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
74 		BIT(IIO_CHAN_INFO_SCALE) |
75 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
76 		BIT(IIO_CHAN_INFO_HYSTERESIS),
77 	}, {
78 		.type = IIO_MAGN,
79 		.modified = 1,
80 		.channel2 = IIO_MOD_Y,
81 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
82 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
83 		BIT(IIO_CHAN_INFO_SCALE) |
84 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
85 		BIT(IIO_CHAN_INFO_HYSTERESIS),
86 	}, {
87 		.type = IIO_MAGN,
88 		.modified = 1,
89 		.channel2 = IIO_MOD_Z,
90 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
91 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
92 		BIT(IIO_CHAN_INFO_SCALE) |
93 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
94 		BIT(IIO_CHAN_INFO_HYSTERESIS),
95 	}, {
96 		.type = IIO_ROT,
97 		.modified = 1,
98 		.channel2 = IIO_MOD_NORTH_MAGN_TILT_COMP,
99 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
100 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
101 		BIT(IIO_CHAN_INFO_SCALE) |
102 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
103 		BIT(IIO_CHAN_INFO_HYSTERESIS),
104 	}, {
105 		.type = IIO_ROT,
106 		.modified = 1,
107 		.channel2 = IIO_MOD_NORTH_TRUE_TILT_COMP,
108 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
109 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
110 		BIT(IIO_CHAN_INFO_SCALE) |
111 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
112 		BIT(IIO_CHAN_INFO_HYSTERESIS),
113 	}, {
114 		.type = IIO_ROT,
115 		.modified = 1,
116 		.channel2 = IIO_MOD_NORTH_MAGN,
117 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
118 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
119 		BIT(IIO_CHAN_INFO_SCALE) |
120 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
121 		BIT(IIO_CHAN_INFO_HYSTERESIS),
122 	}, {
123 		.type = IIO_ROT,
124 		.modified = 1,
125 		.channel2 = IIO_MOD_NORTH_TRUE,
126 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
127 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
128 		BIT(IIO_CHAN_INFO_SCALE) |
129 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
130 		BIT(IIO_CHAN_INFO_HYSTERESIS),
131 	},
132 	IIO_CHAN_SOFT_TIMESTAMP(7)
133 };
134 
135 /* Adjust channel real bits based on report descriptor */
magn_3d_adjust_channel_bit_mask(struct iio_chan_spec * channels,int channel,int size)136 static void magn_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
137 						int channel, int size)
138 {
139 	channels[channel].scan_type.sign = 's';
140 	/* Real storage bits will change based on the report desc. */
141 	channels[channel].scan_type.realbits = size * 8;
142 	/* Maximum size of a sample to capture is u32 */
143 	channels[channel].scan_type.storagebits = sizeof(u32) * 8;
144 }
145 
146 /* Channel read_raw handler */
magn_3d_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)147 static int magn_3d_read_raw(struct iio_dev *indio_dev,
148 			      struct iio_chan_spec const *chan,
149 			      int *val, int *val2,
150 			      long mask)
151 {
152 	struct magn_3d_state *magn_state = iio_priv(indio_dev);
153 	int report_id = -1;
154 	u32 address;
155 	int ret_type;
156 	s32 min;
157 
158 	*val = 0;
159 	*val2 = 0;
160 	switch (mask) {
161 	case IIO_CHAN_INFO_RAW:
162 		hid_sensor_power_state(&magn_state->magn_flux_attributes, true);
163 		report_id = magn_state->magn[chan->address].report_id;
164 		min = magn_state->magn[chan->address].logical_minimum;
165 		address = magn_3d_addresses[chan->address];
166 		if (report_id >= 0)
167 			*val = sensor_hub_input_attr_get_raw_value(
168 				magn_state->magn_flux_attributes.hsdev,
169 				HID_USAGE_SENSOR_COMPASS_3D, address,
170 				report_id,
171 				SENSOR_HUB_SYNC,
172 				min < 0);
173 		else {
174 			*val = 0;
175 			hid_sensor_power_state(
176 				&magn_state->magn_flux_attributes,
177 				false);
178 			return -EINVAL;
179 		}
180 		hid_sensor_power_state(&magn_state->magn_flux_attributes,
181 					false);
182 		ret_type = IIO_VAL_INT;
183 		break;
184 	case IIO_CHAN_INFO_SCALE:
185 		switch (chan->type) {
186 		case IIO_MAGN:
187 			*val = magn_state->magn_flux_attr.scale_pre_decml;
188 			*val2 = magn_state->magn_flux_attr.scale_post_decml;
189 			ret_type = magn_state->magn_flux_attr.scale_precision;
190 			break;
191 		case IIO_ROT:
192 			*val = magn_state->rot_attr.scale_pre_decml;
193 			*val2 = magn_state->rot_attr.scale_post_decml;
194 			ret_type = magn_state->rot_attr.scale_precision;
195 			break;
196 		default:
197 			ret_type = -EINVAL;
198 		}
199 		break;
200 	case IIO_CHAN_INFO_OFFSET:
201 		switch (chan->type) {
202 		case IIO_MAGN:
203 			*val = magn_state->magn_flux_attr.value_offset;
204 			ret_type = IIO_VAL_INT;
205 			break;
206 		case IIO_ROT:
207 			*val = magn_state->rot_attr.value_offset;
208 			ret_type = IIO_VAL_INT;
209 			break;
210 		default:
211 			ret_type = -EINVAL;
212 		}
213 		break;
214 	case IIO_CHAN_INFO_SAMP_FREQ:
215 		ret_type = hid_sensor_read_samp_freq_value(
216 			&magn_state->magn_flux_attributes, val, val2);
217 		break;
218 	case IIO_CHAN_INFO_HYSTERESIS:
219 		switch (chan->type) {
220 		case IIO_MAGN:
221 			ret_type = hid_sensor_read_raw_hyst_value(
222 				&magn_state->magn_flux_attributes, val, val2);
223 			break;
224 		case IIO_ROT:
225 			ret_type = hid_sensor_read_raw_hyst_value(
226 				&magn_state->rot_attributes, val, val2);
227 			break;
228 		default:
229 			ret_type = -EINVAL;
230 		}
231 		break;
232 	default:
233 		ret_type = -EINVAL;
234 		break;
235 	}
236 
237 	return ret_type;
238 }
239 
240 /* Channel write_raw handler */
magn_3d_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)241 static int magn_3d_write_raw(struct iio_dev *indio_dev,
242 			       struct iio_chan_spec const *chan,
243 			       int val,
244 			       int val2,
245 			       long mask)
246 {
247 	struct magn_3d_state *magn_state = iio_priv(indio_dev);
248 	int ret = 0;
249 
250 	switch (mask) {
251 	case IIO_CHAN_INFO_SAMP_FREQ:
252 		ret = hid_sensor_write_samp_freq_value(
253 				&magn_state->magn_flux_attributes, val, val2);
254 		break;
255 	case IIO_CHAN_INFO_HYSTERESIS:
256 		switch (chan->type) {
257 		case IIO_MAGN:
258 			ret = hid_sensor_write_raw_hyst_value(
259 				&magn_state->magn_flux_attributes, val, val2);
260 			break;
261 		case IIO_ROT:
262 			ret = hid_sensor_write_raw_hyst_value(
263 				&magn_state->rot_attributes, val, val2);
264 			break;
265 		default:
266 			ret = -EINVAL;
267 		}
268 		break;
269 	default:
270 		ret = -EINVAL;
271 	}
272 
273 	return ret;
274 }
275 
276 static const struct iio_info magn_3d_info = {
277 	.read_raw = &magn_3d_read_raw,
278 	.write_raw = &magn_3d_write_raw,
279 };
280 
281 /* Callback handler to send event after all samples are received and captured */
magn_3d_proc_event(struct hid_sensor_hub_device * hsdev,unsigned usage_id,void * priv)282 static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
283 				unsigned usage_id,
284 				void *priv)
285 {
286 	struct iio_dev *indio_dev = platform_get_drvdata(priv);
287 	struct magn_3d_state *magn_state = iio_priv(indio_dev);
288 
289 	dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n");
290 	if (atomic_read(&magn_state->magn_flux_attributes.data_ready)) {
291 		if (!magn_state->timestamp)
292 			magn_state->timestamp = iio_get_time_ns(indio_dev);
293 
294 		iio_push_to_buffers_with_timestamp(indio_dev,
295 						   magn_state->iio_vals,
296 						   magn_state->timestamp);
297 		magn_state->timestamp = 0;
298 	}
299 
300 	return 0;
301 }
302 
303 /* Capture samples in local storage */
magn_3d_capture_sample(struct hid_sensor_hub_device * hsdev,unsigned usage_id,size_t raw_len,char * raw_data,void * priv)304 static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
305 				unsigned usage_id,
306 				size_t raw_len, char *raw_data,
307 				void *priv)
308 {
309 	struct iio_dev *indio_dev = platform_get_drvdata(priv);
310 	struct magn_3d_state *magn_state = iio_priv(indio_dev);
311 	int offset;
312 	int ret = 0;
313 	u32 *iio_val = NULL;
314 
315 	switch (usage_id) {
316 	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
317 	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
318 	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
319 		offset = (usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS)
320 				+ CHANNEL_SCAN_INDEX_X;
321 	break;
322 	case HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH:
323 	case HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH:
324 	case HID_USAGE_SENSOR_ORIENT_MAGN_NORTH:
325 	case HID_USAGE_SENSOR_ORIENT_TRUE_NORTH:
326 		offset = (usage_id - HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH)
327 				+ CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP;
328 	break;
329 	case HID_USAGE_SENSOR_TIME_TIMESTAMP:
330 		magn_state->timestamp =
331 			hid_sensor_convert_timestamp(&magn_state->magn_flux_attributes,
332 						     *(s64 *)raw_data);
333 		return ret;
334 	default:
335 		return -EINVAL;
336 	}
337 
338 	iio_val = magn_state->magn_val_addr[offset];
339 
340 	if (iio_val != NULL)
341 		*iio_val = *((u32 *)raw_data);
342 	else
343 		ret = -EINVAL;
344 
345 	return ret;
346 }
347 
348 /* Parse report which is specific to an usage id*/
magn_3d_parse_report(struct platform_device * pdev,struct hid_sensor_hub_device * hsdev,struct iio_chan_spec ** channels,int * chan_count,unsigned usage_id,struct magn_3d_state * st)349 static int magn_3d_parse_report(struct platform_device *pdev,
350 				struct hid_sensor_hub_device *hsdev,
351 				struct iio_chan_spec **channels,
352 				int *chan_count,
353 				unsigned usage_id,
354 				struct magn_3d_state *st)
355 {
356 	int i;
357 	int attr_count = 0;
358 	struct iio_chan_spec *_channels;
359 
360 	/* Scan for each usage attribute supported */
361 	for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) {
362 		int status;
363 		u32 address = magn_3d_addresses[i];
364 
365 		/* Check if usage attribute exists in the sensor hub device */
366 		status = sensor_hub_input_get_attribute_info(hsdev,
367 			HID_INPUT_REPORT,
368 			usage_id,
369 			address,
370 			&(st->magn[i]));
371 		if (!status)
372 			attr_count++;
373 	}
374 
375 	if (attr_count <= 0) {
376 		dev_err(&pdev->dev,
377 			"failed to find any supported usage attributes in report\n");
378 		return  -EINVAL;
379 	}
380 
381 	dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n",
382 			attr_count);
383 	dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %x:%x\n",
384 			st->magn[0].index,
385 			st->magn[0].report_id,
386 			st->magn[1].index, st->magn[1].report_id,
387 			st->magn[2].index, st->magn[2].report_id);
388 
389 	/* Setup IIO channel array */
390 	_channels = devm_kcalloc(&pdev->dev, attr_count,
391 				sizeof(struct iio_chan_spec),
392 				GFP_KERNEL);
393 	if (!_channels) {
394 		dev_err(&pdev->dev,
395 			"failed to allocate space for iio channels\n");
396 		return -ENOMEM;
397 	}
398 
399 	/* attr_count include timestamp channel, and the iio_vals should be aligned to 8byte */
400 	st->iio_vals = devm_kcalloc(&pdev->dev,
401 				    ((attr_count + 1) % 2 + (attr_count + 1) / 2) * 2,
402 				    sizeof(u32), GFP_KERNEL);
403 	if (!st->iio_vals) {
404 		dev_err(&pdev->dev,
405 			"failed to allocate space for iio values array\n");
406 		return -ENOMEM;
407 	}
408 
409 	for (i = 0, *chan_count = 0;
410 	i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count;
411 	i++){
412 		if (st->magn[i].index >= 0) {
413 			/* Setup IIO channel struct */
414 			(_channels[*chan_count]) = magn_3d_channels[i];
415 			(_channels[*chan_count]).scan_index = *chan_count;
416 			(_channels[*chan_count]).address = i;
417 
418 			if (i != CHANNEL_SCAN_INDEX_TIMESTAMP) {
419 				/* Set magn_val_addr to iio value address */
420 				st->magn_val_addr[i] = &st->iio_vals[*chan_count];
421 				magn_3d_adjust_channel_bit_mask(_channels,
422 								*chan_count,
423 								st->magn[i].size);
424 			}
425 			(*chan_count)++;
426 		}
427 	}
428 
429 	if (*chan_count <= 0) {
430 		dev_err(&pdev->dev,
431 			"failed to find any magnetic channels setup\n");
432 		return -EINVAL;
433 	}
434 
435 	*channels = _channels;
436 
437 	dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n",
438 			*chan_count);
439 
440 	st->magn_flux_attr.scale_precision = hid_sensor_format_scale(
441 				HID_USAGE_SENSOR_COMPASS_3D,
442 				&st->magn[CHANNEL_SCAN_INDEX_X],
443 				&st->magn_flux_attr.scale_pre_decml,
444 				&st->magn_flux_attr.scale_post_decml);
445 	st->rot_attr.scale_precision
446 		= hid_sensor_format_scale(
447 			HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
448 			&st->magn[CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP],
449 			&st->rot_attr.scale_pre_decml,
450 			&st->rot_attr.scale_post_decml);
451 
452 	if (st->rot_attributes.sensitivity.index < 0) {
453 		sensor_hub_input_get_attribute_info(hsdev,
454 			HID_FEATURE_REPORT, usage_id,
455 			HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
456 			HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
457 			&st->rot_attributes.sensitivity);
458 		dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
459 			st->rot_attributes.sensitivity.index,
460 			st->rot_attributes.sensitivity.report_id);
461 	}
462 
463 	return 0;
464 }
465 
466 /* Function to initialize the processing for usage id */
hid_magn_3d_probe(struct platform_device * pdev)467 static int hid_magn_3d_probe(struct platform_device *pdev)
468 {
469 	int ret = 0;
470 	static char *name = "magn_3d";
471 	struct iio_dev *indio_dev;
472 	struct magn_3d_state *magn_state;
473 	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
474 	struct iio_chan_spec *channels;
475 	int chan_count = 0;
476 
477 	indio_dev = devm_iio_device_alloc(&pdev->dev,
478 					  sizeof(struct magn_3d_state));
479 	if (indio_dev == NULL)
480 		return -ENOMEM;
481 
482 	platform_set_drvdata(pdev, indio_dev);
483 
484 	magn_state = iio_priv(indio_dev);
485 	magn_state->magn_flux_attributes.hsdev = hsdev;
486 	magn_state->magn_flux_attributes.pdev = pdev;
487 
488 	ret = hid_sensor_parse_common_attributes(hsdev,
489 				HID_USAGE_SENSOR_COMPASS_3D,
490 				&magn_state->magn_flux_attributes,
491 				magn_3d_sensitivity_addresses,
492 				ARRAY_SIZE(magn_3d_sensitivity_addresses));
493 	if (ret) {
494 		dev_err(&pdev->dev, "failed to setup common attributes\n");
495 		return ret;
496 	}
497 	magn_state->rot_attributes = magn_state->magn_flux_attributes;
498 	/* sensitivity of rot_attribute is not the same as magn_flux_attributes */
499 	magn_state->rot_attributes.sensitivity.index = -1;
500 
501 	ret = magn_3d_parse_report(pdev, hsdev,
502 				&channels, &chan_count,
503 				HID_USAGE_SENSOR_COMPASS_3D, magn_state);
504 	if (ret) {
505 		dev_err(&pdev->dev, "failed to parse report\n");
506 		return ret;
507 	}
508 
509 	indio_dev->channels = channels;
510 	indio_dev->num_channels = chan_count;
511 	indio_dev->info = &magn_3d_info;
512 	indio_dev->name = name;
513 	indio_dev->modes = INDIO_DIRECT_MODE;
514 
515 	atomic_set(&magn_state->magn_flux_attributes.data_ready, 0);
516 
517 	ret = hid_sensor_setup_trigger(indio_dev, name,
518 					&magn_state->magn_flux_attributes);
519 	if (ret < 0) {
520 		dev_err(&pdev->dev, "trigger setup failed\n");
521 		return ret;
522 	}
523 
524 	ret = iio_device_register(indio_dev);
525 	if (ret) {
526 		dev_err(&pdev->dev, "device register failed\n");
527 		goto error_remove_trigger;
528 	}
529 
530 	magn_state->callbacks.send_event = magn_3d_proc_event;
531 	magn_state->callbacks.capture_sample = magn_3d_capture_sample;
532 	magn_state->callbacks.pdev = pdev;
533 	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D,
534 					&magn_state->callbacks);
535 	if (ret < 0) {
536 		dev_err(&pdev->dev, "callback reg failed\n");
537 		goto error_iio_unreg;
538 	}
539 
540 	return ret;
541 
542 error_iio_unreg:
543 	iio_device_unregister(indio_dev);
544 error_remove_trigger:
545 	hid_sensor_remove_trigger(indio_dev, &magn_state->magn_flux_attributes);
546 	return ret;
547 }
548 
549 /* Function to deinitialize the processing for usage id */
hid_magn_3d_remove(struct platform_device * pdev)550 static int hid_magn_3d_remove(struct platform_device *pdev)
551 {
552 	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
553 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
554 	struct magn_3d_state *magn_state = iio_priv(indio_dev);
555 
556 	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D);
557 	iio_device_unregister(indio_dev);
558 	hid_sensor_remove_trigger(indio_dev, &magn_state->magn_flux_attributes);
559 
560 	return 0;
561 }
562 
563 static const struct platform_device_id hid_magn_3d_ids[] = {
564 	{
565 		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
566 		.name = "HID-SENSOR-200083",
567 	},
568 	{ /* sentinel */ }
569 };
570 MODULE_DEVICE_TABLE(platform, hid_magn_3d_ids);
571 
572 static struct platform_driver hid_magn_3d_platform_driver = {
573 	.id_table = hid_magn_3d_ids,
574 	.driver = {
575 		.name	= KBUILD_MODNAME,
576 		.pm	= &hid_sensor_pm_ops,
577 	},
578 	.probe		= hid_magn_3d_probe,
579 	.remove		= hid_magn_3d_remove,
580 };
581 module_platform_driver(hid_magn_3d_platform_driver);
582 
583 MODULE_DESCRIPTION("HID Sensor Magnetometer 3D");
584 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
585 MODULE_LICENSE("GPL");
586 MODULE_IMPORT_NS(IIO_HID);
587