1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2011 Jonathan Cameron
4 *
5 * A reference industrial I/O driver to illustrate the functionality available.
6 *
7 * There are numerous real drivers to illustrate the finer points.
8 * The purpose of this driver is to provide a driver with far more comments
9 * and explanatory notes than any 'real' driver would have.
10 * Anyone starting out writing an IIO driver should first make sure they
11 * understand all of this driver except those bits specifically marked
12 * as being present to allow us to 'fake' the presence of hardware.
13 */
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/string.h>
18
19#include <linux/iio/iio.h>
20#include <linux/iio/sysfs.h>
21#include <linux/iio/events.h>
22#include <linux/iio/buffer.h>
23#include <linux/iio/sw_device.h>
24#include "iio_simple_dummy.h"
25
26static const struct config_item_type iio_dummy_type = {
27	.ct_owner = THIS_MODULE,
28};
29
30/**
31 * struct iio_dummy_accel_calibscale - realworld to register mapping
32 * @val: first value in read_raw - here integer part.
33 * @val2: second value in read_raw etc - here micro part.
34 * @regval: register value - magic device specific numbers.
35 */
36struct iio_dummy_accel_calibscale {
37	int val;
38	int val2;
39	int regval; /* what would be written to hardware */
40};
41
42static const struct iio_dummy_accel_calibscale dummy_scales[] = {
43	{ 0, 100, 0x8 }, /* 0.000100 */
44	{ 0, 133, 0x7 }, /* 0.000133 */
45	{ 733, 13, 0x9 }, /* 733.000013 */
46};
47
48#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
49
50/*
51 * simple event - triggered when value rises above
52 * a threshold
53 */
54static const struct iio_event_spec iio_dummy_event = {
55	.type = IIO_EV_TYPE_THRESH,
56	.dir = IIO_EV_DIR_RISING,
57	.mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
58};
59
60/*
61 * simple step detect event - triggered when a step is detected
62 */
63static const struct iio_event_spec step_detect_event = {
64	.type = IIO_EV_TYPE_CHANGE,
65	.dir = IIO_EV_DIR_NONE,
66	.mask_separate = BIT(IIO_EV_INFO_ENABLE),
67};
68
69/*
70 * simple transition event - triggered when the reported running confidence
71 * value rises above a threshold value
72 */
73static const struct iio_event_spec iio_running_event = {
74	.type = IIO_EV_TYPE_THRESH,
75	.dir = IIO_EV_DIR_RISING,
76	.mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
77};
78
79/*
80 * simple transition event - triggered when the reported walking confidence
81 * value falls under a threshold value
82 */
83static const struct iio_event_spec iio_walking_event = {
84	.type = IIO_EV_TYPE_THRESH,
85	.dir = IIO_EV_DIR_FALLING,
86	.mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
87};
88#endif
89
90/*
91 * iio_dummy_channels - Description of available channels
92 *
93 * This array of structures tells the IIO core about what the device
94 * actually provides for a given channel.
95 */
96static const struct iio_chan_spec iio_dummy_channels[] = {
97	/* indexed ADC channel in_voltage0_raw etc */
98	{
99		.type = IIO_VOLTAGE,
100		/* Channel has a numeric index of 0 */
101		.indexed = 1,
102		.channel = 0,
103		/* What other information is available? */
104		.info_mask_separate =
105		/*
106		 * in_voltage0_raw
107		 * Raw (unscaled no bias removal etc) measurement
108		 * from the device.
109		 */
110		BIT(IIO_CHAN_INFO_RAW) |
111		/*
112		 * in_voltage0_offset
113		 * Offset for userspace to apply prior to scale
114		 * when converting to standard units (microvolts)
115		 */
116		BIT(IIO_CHAN_INFO_OFFSET) |
117		/*
118		 * in_voltage0_scale
119		 * Multipler for userspace to apply post offset
120		 * when converting to standard units (microvolts)
121		 */
122		BIT(IIO_CHAN_INFO_SCALE),
123		/*
124		 * sampling_frequency
125		 * The frequency in Hz at which the channels are sampled
126		 */
127		.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ),
128		/* The ordering of elements in the buffer via an enum */
129		.scan_index = DUMMY_INDEX_VOLTAGE_0,
130		.scan_type = { /* Description of storage in buffer */
131			.sign = 'u', /* unsigned */
132			.realbits = 13, /* 13 bits */
133			.storagebits = 16, /* 16 bits used for storage */
134			.shift = 0, /* zero shift */
135		},
136#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
137		.event_spec = &iio_dummy_event,
138		.num_event_specs = 1,
139#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
140	},
141	/* Differential ADC channel in_voltage1-voltage2_raw etc*/
142	{
143		.type = IIO_VOLTAGE,
144		.differential = 1,
145		/*
146		 * Indexing for differential channels uses channel
147		 * for the positive part, channel2 for the negative.
148		 */
149		.indexed = 1,
150		.channel = 1,
151		.channel2 = 2,
152		/*
153		 * in_voltage1-voltage2_raw
154		 * Raw (unscaled no bias removal etc) measurement
155		 * from the device.
156		 */
157		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
158		/*
159		 * in_voltage-voltage_scale
160		 * Shared version of scale - shared by differential
161		 * input channels of type IIO_VOLTAGE.
162		 */
163		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
164		/*
165		 * sampling_frequency
166		 * The frequency in Hz at which the channels are sampled
167		 */
168		.scan_index = DUMMY_INDEX_DIFFVOLTAGE_1M2,
169		.scan_type = { /* Description of storage in buffer */
170			.sign = 's', /* signed */
171			.realbits = 12, /* 12 bits */
172			.storagebits = 16, /* 16 bits used for storage */
173			.shift = 0, /* zero shift */
174		},
175	},
176	/* Differential ADC channel in_voltage3-voltage4_raw etc*/
177	{
178		.type = IIO_VOLTAGE,
179		.differential = 1,
180		.indexed = 1,
181		.channel = 3,
182		.channel2 = 4,
183		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
184		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
185		.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ),
186		.scan_index = DUMMY_INDEX_DIFFVOLTAGE_3M4,
187		.scan_type = {
188			.sign = 's',
189			.realbits = 11,
190			.storagebits = 16,
191			.shift = 0,
192		},
193	},
194	/*
195	 * 'modified' (i.e. axis specified) acceleration channel
196	 * in_accel_z_raw
197	 */
198	{
199		.type = IIO_ACCEL,
200		.modified = 1,
201		/* Channel 2 is use for modifiers */
202		.channel2 = IIO_MOD_X,
203		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
204		/*
205		 * Internal bias and gain correction values. Applied
206		 * by the hardware or driver prior to userspace
207		 * seeing the readings. Typically part of hardware
208		 * calibration.
209		 */
210		BIT(IIO_CHAN_INFO_CALIBSCALE) |
211		BIT(IIO_CHAN_INFO_CALIBBIAS),
212		.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ),
213		.scan_index = DUMMY_INDEX_ACCELX,
214		.scan_type = { /* Description of storage in buffer */
215			.sign = 's', /* signed */
216			.realbits = 16, /* 16 bits */
217			.storagebits = 16, /* 16 bits used for storage */
218			.shift = 0, /* zero shift */
219		},
220	},
221	/*
222	 * Convenience macro for timestamps. 4 is the index in
223	 * the buffer.
224	 */
225	IIO_CHAN_SOFT_TIMESTAMP(4),
226	/* DAC channel out_voltage0_raw */
227	{
228		.type = IIO_VOLTAGE,
229		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
230		.scan_index = -1, /* No buffer support */
231		.output = 1,
232		.indexed = 1,
233		.channel = 0,
234	},
235	{
236		.type = IIO_STEPS,
237		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_ENABLE) |
238			BIT(IIO_CHAN_INFO_CALIBHEIGHT),
239		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
240		.scan_index = -1, /* No buffer support */
241#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
242		.event_spec = &step_detect_event,
243		.num_event_specs = 1,
244#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
245	},
246	{
247		.type = IIO_ACTIVITY,
248		.modified = 1,
249		.channel2 = IIO_MOD_RUNNING,
250		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
251		.scan_index = -1, /* No buffer support */
252#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
253		.event_spec = &iio_running_event,
254		.num_event_specs = 1,
255#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
256	},
257	{
258		.type = IIO_ACTIVITY,
259		.modified = 1,
260		.channel2 = IIO_MOD_WALKING,
261		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
262		.scan_index = -1, /* No buffer support */
263#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
264		.event_spec = &iio_walking_event,
265		.num_event_specs = 1,
266#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
267	},
268};
269
270/**
271 * iio_dummy_read_raw() - data read function.
272 * @indio_dev:	the struct iio_dev associated with this device instance
273 * @chan:	the channel whose data is to be read
274 * @val:	first element of returned value (typically INT)
275 * @val2:	second element of returned value (typically MICRO)
276 * @mask:	what we actually want to read as per the info_mask_*
277 *		in iio_chan_spec.
278 */
279static int iio_dummy_read_raw(struct iio_dev *indio_dev,
280			      struct iio_chan_spec const *chan,
281			      int *val,
282			      int *val2,
283			      long mask)
284{
285	struct iio_dummy_state *st = iio_priv(indio_dev);
286
287	switch (mask) {
288	case IIO_CHAN_INFO_RAW: /* magic value - channel value read */
289		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
290			guard(mutex)(&st->lock);
291			switch (chan->type) {
292			case IIO_VOLTAGE:
293				if (chan->output) {
294					/* Set integer part to cached value */
295					*val = st->dac_val;
296					return IIO_VAL_INT;
297				} else if (chan->differential) {
298					if (chan->channel == 1)
299						*val = st->differential_adc_val[0];
300					else
301						*val = st->differential_adc_val[1];
302					return IIO_VAL_INT;
303				} else {
304					*val = st->single_ended_adc_val;
305					return IIO_VAL_INT;
306				}
307
308			case IIO_ACCEL:
309				*val = st->accel_val;
310				return IIO_VAL_INT;
311			default:
312				return -EINVAL;
313			}
314		}
315		unreachable();
316	case IIO_CHAN_INFO_PROCESSED:
317		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
318			guard(mutex)(&st->lock);
319			switch (chan->type) {
320			case IIO_STEPS:
321				*val = st->steps;
322				return IIO_VAL_INT;
323			case IIO_ACTIVITY:
324				switch (chan->channel2) {
325				case IIO_MOD_RUNNING:
326					*val = st->activity_running;
327					return IIO_VAL_INT;
328				case IIO_MOD_WALKING:
329					*val = st->activity_walking;
330					return IIO_VAL_INT;
331				default:
332					return -EINVAL;
333				}
334			default:
335				return -EINVAL;
336			}
337		}
338		unreachable();
339	case IIO_CHAN_INFO_OFFSET:
340		/* only single ended adc -> 7 */
341		*val = 7;
342		return IIO_VAL_INT;
343	case IIO_CHAN_INFO_SCALE:
344		switch (chan->type) {
345		case IIO_VOLTAGE:
346			switch (chan->differential) {
347			case 0:
348				/* only single ended adc -> 0.001333 */
349				*val = 0;
350				*val2 = 1333;
351				return IIO_VAL_INT_PLUS_MICRO;
352			case 1:
353				/* all differential adc -> 0.000001344 */
354				*val = 0;
355				*val2 = 1344;
356				return IIO_VAL_INT_PLUS_NANO;
357			default:
358				return -EINVAL;
359			}
360		default:
361			return -EINVAL;
362		}
363	case IIO_CHAN_INFO_CALIBBIAS: {
364		guard(mutex)(&st->lock);
365		/* only the acceleration axis - read from cache */
366		*val = st->accel_calibbias;
367		return IIO_VAL_INT;
368	}
369	case IIO_CHAN_INFO_CALIBSCALE: {
370		guard(mutex)(&st->lock);
371		*val = st->accel_calibscale->val;
372		*val2 = st->accel_calibscale->val2;
373		return IIO_VAL_INT_PLUS_MICRO;
374	}
375	case IIO_CHAN_INFO_SAMP_FREQ:
376		*val = 3;
377		*val2 = 33;
378		return IIO_VAL_INT_PLUS_NANO;
379	case IIO_CHAN_INFO_ENABLE: {
380		guard(mutex)(&st->lock);
381		switch (chan->type) {
382		case IIO_STEPS:
383			*val = st->steps_enabled;
384			return IIO_VAL_INT;
385		default:
386			return -EINVAL;
387		}
388	}
389	case IIO_CHAN_INFO_CALIBHEIGHT: {
390		guard(mutex)(&st->lock);
391		switch (chan->type) {
392		case IIO_STEPS:
393			*val = st->height;
394			return IIO_VAL_INT;
395		default:
396			return -EINVAL;
397		}
398	}
399	default:
400		return -EINVAL;
401	}
402}
403
404/**
405 * iio_dummy_write_raw() - data write function.
406 * @indio_dev:	the struct iio_dev associated with this device instance
407 * @chan:	the channel whose data is to be written
408 * @val:	first element of value to set (typically INT)
409 * @val2:	second element of value to set (typically MICRO)
410 * @mask:	what we actually want to write as per the info_mask_*
411 *		in iio_chan_spec.
412 *
413 * Note that all raw writes are assumed IIO_VAL_INT and info mask elements
414 * are assumed to be IIO_INT_PLUS_MICRO unless the callback write_raw_get_fmt
415 * in struct iio_info is provided by the driver.
416 */
417static int iio_dummy_write_raw(struct iio_dev *indio_dev,
418			       struct iio_chan_spec const *chan,
419			       int val,
420			       int val2,
421			       long mask)
422{
423	int i;
424	struct iio_dummy_state *st = iio_priv(indio_dev);
425
426	switch (mask) {
427	case IIO_CHAN_INFO_RAW:
428		switch (chan->type) {
429		case IIO_VOLTAGE:
430			if (chan->output == 0)
431				return -EINVAL;
432
433			scoped_guard(mutex, &st->lock) {
434				/* Locking not required as writing single value */
435				st->dac_val = val;
436			}
437			return 0;
438		default:
439			return -EINVAL;
440		}
441	case IIO_CHAN_INFO_PROCESSED:
442		switch (chan->type) {
443		case IIO_STEPS:
444			scoped_guard(mutex, &st->lock) {
445				st->steps = val;
446			}
447			return 0;
448		case IIO_ACTIVITY:
449			if (val < 0)
450				val = 0;
451			if (val > 100)
452				val = 100;
453			switch (chan->channel2) {
454			case IIO_MOD_RUNNING:
455				st->activity_running = val;
456				return 0;
457			case IIO_MOD_WALKING:
458				st->activity_walking = val;
459				return 0;
460			default:
461				return -EINVAL;
462			}
463			break;
464		default:
465			return -EINVAL;
466		}
467	case IIO_CHAN_INFO_CALIBSCALE: {
468		guard(mutex)(&st->lock);
469		/* Compare against table - hard matching here */
470		for (i = 0; i < ARRAY_SIZE(dummy_scales); i++)
471			if (val == dummy_scales[i].val &&
472			    val2 == dummy_scales[i].val2)
473				break;
474		if (i == ARRAY_SIZE(dummy_scales))
475			return -EINVAL;
476		st->accel_calibscale = &dummy_scales[i];
477		return 0;
478	}
479	case IIO_CHAN_INFO_CALIBBIAS:
480		scoped_guard(mutex, &st->lock) {
481			st->accel_calibbias = val;
482		}
483		return 0;
484	case IIO_CHAN_INFO_ENABLE:
485		switch (chan->type) {
486		case IIO_STEPS:
487			scoped_guard(mutex, &st->lock) {
488				st->steps_enabled = val;
489			}
490			return 0;
491		default:
492			return -EINVAL;
493		}
494	case IIO_CHAN_INFO_CALIBHEIGHT:
495		switch (chan->type) {
496		case IIO_STEPS:
497			st->height = val;
498			return 0;
499		default:
500			return -EINVAL;
501		}
502
503	default:
504		return -EINVAL;
505	}
506}
507
508/*
509 * Device type specific information.
510 */
511static const struct iio_info iio_dummy_info = {
512	.read_raw = &iio_dummy_read_raw,
513	.write_raw = &iio_dummy_write_raw,
514#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
515	.read_event_config = &iio_simple_dummy_read_event_config,
516	.write_event_config = &iio_simple_dummy_write_event_config,
517	.read_event_value = &iio_simple_dummy_read_event_value,
518	.write_event_value = &iio_simple_dummy_write_event_value,
519#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
520};
521
522/**
523 * iio_dummy_init_device() - device instance specific init
524 * @indio_dev: the iio device structure
525 *
526 * Most drivers have one of these to set up default values,
527 * reset the device to known state etc.
528 */
529static int iio_dummy_init_device(struct iio_dev *indio_dev)
530{
531	struct iio_dummy_state *st = iio_priv(indio_dev);
532
533	st->dac_val = 0;
534	st->single_ended_adc_val = 73;
535	st->differential_adc_val[0] = 33;
536	st->differential_adc_val[1] = -34;
537	st->accel_val = 34;
538	st->accel_calibbias = -7;
539	st->accel_calibscale = &dummy_scales[0];
540	st->steps = 47;
541	st->activity_running = 98;
542	st->activity_walking = 4;
543
544	return 0;
545}
546
547/**
548 * iio_dummy_probe() - device instance probe
549 * @name: name of this instance.
550 *
551 * Arguments are bus type specific.
552 * I2C: iio_dummy_probe(struct i2c_client *client,
553 *                      const struct i2c_device_id *id)
554 * SPI: iio_dummy_probe(struct spi_device *spi)
555 */
556static struct iio_sw_device *iio_dummy_probe(const char *name)
557{
558	int ret;
559	struct iio_dev *indio_dev;
560	struct iio_dummy_state *st;
561	struct iio_sw_device *swd;
562	struct device *parent = NULL;
563
564	/*
565	 * With hardware: Set the parent device.
566	 * parent = &spi->dev;
567	 * parent = &client->dev;
568	 */
569
570	swd = kzalloc(sizeof(*swd), GFP_KERNEL);
571	if (!swd)
572		return ERR_PTR(-ENOMEM);
573
574	/*
575	 * Allocate an IIO device.
576	 *
577	 * This structure contains all generic state
578	 * information about the device instance.
579	 * It also has a region (accessed by iio_priv()
580	 * for chip specific state information.
581	 */
582	indio_dev = iio_device_alloc(parent, sizeof(*st));
583	if (!indio_dev) {
584		ret = -ENOMEM;
585		goto error_free_swd;
586	}
587
588	st = iio_priv(indio_dev);
589	mutex_init(&st->lock);
590
591	iio_dummy_init_device(indio_dev);
592
593	 /*
594	 * Make the iio_dev struct available to remove function.
595	 * Bus equivalents
596	 * i2c_set_clientdata(client, indio_dev);
597	 * spi_set_drvdata(spi, indio_dev);
598	 */
599	swd->device = indio_dev;
600
601	/*
602	 * Set the device name.
603	 *
604	 * This is typically a part number and obtained from the module
605	 * id table.
606	 * e.g. for i2c and spi:
607	 *    indio_dev->name = id->name;
608	 *    indio_dev->name = spi_get_device_id(spi)->name;
609	 */
610	indio_dev->name = kstrdup(name, GFP_KERNEL);
611	if (!indio_dev->name) {
612		ret = -ENOMEM;
613		goto error_free_device;
614	}
615
616	/* Provide description of available channels */
617	indio_dev->channels = iio_dummy_channels;
618	indio_dev->num_channels = ARRAY_SIZE(iio_dummy_channels);
619
620	/*
621	 * Provide device type specific interface functions and
622	 * constant data.
623	 */
624	indio_dev->info = &iio_dummy_info;
625
626	/* Specify that device provides sysfs type interfaces */
627	indio_dev->modes = INDIO_DIRECT_MODE;
628
629	ret = iio_simple_dummy_events_register(indio_dev);
630	if (ret < 0)
631		goto error_free_name;
632
633	ret = iio_simple_dummy_configure_buffer(indio_dev);
634	if (ret < 0)
635		goto error_unregister_events;
636
637	ret = iio_device_register(indio_dev);
638	if (ret < 0)
639		goto error_unconfigure_buffer;
640
641	iio_swd_group_init_type_name(swd, name, &iio_dummy_type);
642
643	return swd;
644error_unconfigure_buffer:
645	iio_simple_dummy_unconfigure_buffer(indio_dev);
646error_unregister_events:
647	iio_simple_dummy_events_unregister(indio_dev);
648error_free_name:
649	kfree(indio_dev->name);
650error_free_device:
651	iio_device_free(indio_dev);
652error_free_swd:
653	kfree(swd);
654	return ERR_PTR(ret);
655}
656
657/**
658 * iio_dummy_remove() - device instance removal function
659 * @swd: pointer to software IIO device abstraction
660 *
661 * Parameters follow those of iio_dummy_probe for buses.
662 */
663static int iio_dummy_remove(struct iio_sw_device *swd)
664{
665	/*
666	 * Get a pointer to the device instance iio_dev structure
667	 * from the bus subsystem. E.g.
668	 * struct iio_dev *indio_dev = i2c_get_clientdata(client);
669	 * struct iio_dev *indio_dev = spi_get_drvdata(spi);
670	 */
671	struct iio_dev *indio_dev = swd->device;
672
673	/* Unregister the device */
674	iio_device_unregister(indio_dev);
675
676	/* Device specific code to power down etc */
677
678	/* Buffered capture related cleanup */
679	iio_simple_dummy_unconfigure_buffer(indio_dev);
680
681	iio_simple_dummy_events_unregister(indio_dev);
682
683	/* Free all structures */
684	kfree(indio_dev->name);
685	iio_device_free(indio_dev);
686
687	return 0;
688}
689
690/*
691 * module_iio_sw_device_driver() -  device driver registration
692 *
693 * Varies depending on bus type of the device. As there is no device
694 * here, call probe directly. For information on device registration
695 * i2c:
696 * Documentation/i2c/writing-clients.rst
697 * spi:
698 * Documentation/spi/spi-summary.rst
699 */
700static const struct iio_sw_device_ops iio_dummy_device_ops = {
701	.probe = iio_dummy_probe,
702	.remove = iio_dummy_remove,
703};
704
705static struct iio_sw_device_type iio_dummy_device = {
706	.name = "dummy",
707	.owner = THIS_MODULE,
708	.ops = &iio_dummy_device_ops,
709};
710
711module_iio_sw_device_driver(iio_dummy_device);
712
713MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
714MODULE_DESCRIPTION("IIO dummy driver");
715MODULE_LICENSE("GPL v2");
716