1 // SPDX-License-Identifier: GPL-2.0-only
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.
43 	{ 0, 100, 0x8 }, /* 0.000100 */
44 	{ 0, 133, 0x7 }, /* 0.000133 */
45 	{ 733, 13, 0x9 }, /* 733.000013 */
51  * simple event - triggered when value rises above
61  * simple step detect event - triggered when a step is detected
70  * simple transition event - triggered when the reported running confidence
80  * simple transition event - triggered when the reported walking confidence
91  * iio_dummy_channels - Description of available channels
97 	/* indexed ADC channel in_voltage0_raw etc */
100 		/* Channel has a numeric index of 0 */
101 		.indexed = 1,
102 		.channel = 0,
134 			.shift = 0, /* zero shift */
141 	/* Differential ADC channel in_voltage1-voltage2_raw etc*/
149 		.indexed = 1,
153 		 * in_voltage1-voltage2_raw
159 		 * in_voltage-voltage_scale
160 		 * Shared version of scale - shared by differential
173 			.shift = 0, /* zero shift */
176 	/* Differential ADC channel in_voltage3-voltage4_raw etc*/
180 		.indexed = 1,
191 			.shift = 0,
218 			.shift = 0, /* zero shift */
230 		.scan_index = -1, /* No buffer support */
232 		.indexed = 1,
233 		.channel = 0,
240 		.scan_index = -1, /* No buffer support */
251 		.scan_index = -1, /* No buffer support */
262 		.scan_index = -1, /* No buffer support */
271  * iio_dummy_read_raw() - data read function.
288 	case IIO_CHAN_INFO_RAW: /* magic value - channel value read */  in iio_dummy_read_raw()
289 		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {  in iio_dummy_read_raw()
290 			guard(mutex)(&st->lock);  in iio_dummy_read_raw()
291 			switch (chan->type) {  in iio_dummy_read_raw()
293 				if (chan->output) {  in iio_dummy_read_raw()
295 					*val = st->dac_val;  in iio_dummy_read_raw()
297 				} else if (chan->differential) {  in iio_dummy_read_raw()
298 					if (chan->channel == 1)  in iio_dummy_read_raw()
299 						*val = st->differential_adc_val[0];  in iio_dummy_read_raw()
301 						*val = st->differential_adc_val[1];  in iio_dummy_read_raw()
304 					*val = st->single_ended_adc_val;  in iio_dummy_read_raw()
309 				*val = st->accel_val;  in iio_dummy_read_raw()
312 				return -EINVAL;  in iio_dummy_read_raw()
317 		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {  in iio_dummy_read_raw()
318 			guard(mutex)(&st->lock);  in iio_dummy_read_raw()
319 			switch (chan->type) {  in iio_dummy_read_raw()
321 				*val = st->steps;  in iio_dummy_read_raw()
324 				switch (chan->channel2) {  in iio_dummy_read_raw()
326 					*val = st->activity_running;  in iio_dummy_read_raw()
329 					*val = st->activity_walking;  in iio_dummy_read_raw()
332 					return -EINVAL;  in iio_dummy_read_raw()
335 				return -EINVAL;  in iio_dummy_read_raw()
340 		/* only single ended adc -> 7 */  in iio_dummy_read_raw()
344 		switch (chan->type) {  in iio_dummy_read_raw()
346 			switch (chan->differential) {  in iio_dummy_read_raw()
347 			case 0:  in iio_dummy_read_raw()
348 				/* only single ended adc -> 0.001333 */  in iio_dummy_read_raw()
349 				*val = 0;  in iio_dummy_read_raw()
353 				/* all differential adc -> 0.000001344 */  in iio_dummy_read_raw()
354 				*val = 0;  in iio_dummy_read_raw()
358 				return -EINVAL;  in iio_dummy_read_raw()
361 			return -EINVAL;  in iio_dummy_read_raw()
364 		guard(mutex)(&st->lock);  in iio_dummy_read_raw()
365 		/* only the acceleration axis - read from cache */  in iio_dummy_read_raw()
366 		*val = st->accel_calibbias;  in iio_dummy_read_raw()
370 		guard(mutex)(&st->lock);  in iio_dummy_read_raw()
371 		*val = st->accel_calibscale->val;  in iio_dummy_read_raw()
372 		*val2 = st->accel_calibscale->val2;  in iio_dummy_read_raw()
380 		guard(mutex)(&st->lock);  in iio_dummy_read_raw()
381 		switch (chan->type) {  in iio_dummy_read_raw()
383 			*val = st->steps_enabled;  in iio_dummy_read_raw()
386 			return -EINVAL;  in iio_dummy_read_raw()
390 		guard(mutex)(&st->lock);  in iio_dummy_read_raw()
391 		switch (chan->type) {  in iio_dummy_read_raw()
393 			*val = st->height;  in iio_dummy_read_raw()
396 			return -EINVAL;  in iio_dummy_read_raw()
400 		return -EINVAL;  in iio_dummy_read_raw()
405  * iio_dummy_write_raw() - data write function.
428 		switch (chan->type) {  in iio_dummy_write_raw()
430 			if (chan->output == 0)  in iio_dummy_write_raw()
431 				return -EINVAL;  in iio_dummy_write_raw()
433 			scoped_guard(mutex, &st->lock) {  in iio_dummy_write_raw()
435 				st->dac_val = val;  in iio_dummy_write_raw()
437 			return 0;  in iio_dummy_write_raw()
439 			return -EINVAL;  in iio_dummy_write_raw()
442 		switch (chan->type) {  in iio_dummy_write_raw()
444 			scoped_guard(mutex, &st->lock) {  in iio_dummy_write_raw()
445 				st->steps = val;  in iio_dummy_write_raw()
447 			return 0;  in iio_dummy_write_raw()
449 			if (val < 0)  in iio_dummy_write_raw()
450 				val = 0;  in iio_dummy_write_raw()
453 			switch (chan->channel2) {  in iio_dummy_write_raw()
455 				st->activity_running = val;  in iio_dummy_write_raw()
456 				return 0;  in iio_dummy_write_raw()
458 				st->activity_walking = val;  in iio_dummy_write_raw()
459 				return 0;  in iio_dummy_write_raw()
461 				return -EINVAL;  in iio_dummy_write_raw()
465 			return -EINVAL;  in iio_dummy_write_raw()
468 		guard(mutex)(&st->lock);  in iio_dummy_write_raw()
469 		/* Compare against table - hard matching here */  in iio_dummy_write_raw()
470 		for (i = 0; i < ARRAY_SIZE(dummy_scales); i++)  in iio_dummy_write_raw()
475 			return -EINVAL;  in iio_dummy_write_raw()
476 		st->accel_calibscale = &dummy_scales[i];  in iio_dummy_write_raw()
477 		return 0;  in iio_dummy_write_raw()
480 		scoped_guard(mutex, &st->lock) {  in iio_dummy_write_raw()
481 			st->accel_calibbias = val;  in iio_dummy_write_raw()
483 		return 0;  in iio_dummy_write_raw()
485 		switch (chan->type) {  in iio_dummy_write_raw()
487 			scoped_guard(mutex, &st->lock) {  in iio_dummy_write_raw()
488 				st->steps_enabled = val;  in iio_dummy_write_raw()
490 			return 0;  in iio_dummy_write_raw()
492 			return -EINVAL;  in iio_dummy_write_raw()
495 		switch (chan->type) {  in iio_dummy_write_raw()
497 			st->height = val;  in iio_dummy_write_raw()
498 			return 0;  in iio_dummy_write_raw()
500 			return -EINVAL;  in iio_dummy_write_raw()
504 		return -EINVAL;  in iio_dummy_write_raw()
523  * iio_dummy_init_device() - device instance specific init
533 	st->dac_val = 0;  in iio_dummy_init_device()
534 	st->single_ended_adc_val = 73;  in iio_dummy_init_device()
535 	st->differential_adc_val[0] = 33;  in iio_dummy_init_device()
536 	st->differential_adc_val[1] = -34;  in iio_dummy_init_device()
537 	st->accel_val = 34;  in iio_dummy_init_device()
538 	st->accel_calibbias = -7;  in iio_dummy_init_device()
539 	st->accel_calibscale = &dummy_scales[0];  in iio_dummy_init_device()
540 	st->steps = 47;  in iio_dummy_init_device()
541 	st->activity_running = 98;  in iio_dummy_init_device()
542 	st->activity_walking = 4;  in iio_dummy_init_device()
544 	return 0;  in iio_dummy_init_device()
548  * iio_dummy_probe() - device instance probe
566 	 * parent = &spi->dev;  in iio_dummy_probe()
567 	 * parent = &client->dev;  in iio_dummy_probe()
572 		return ERR_PTR(-ENOMEM);  in iio_dummy_probe()
584 		ret = -ENOMEM;  in iio_dummy_probe()
589 	mutex_init(&st->lock);  in iio_dummy_probe()
599 	swd->device = indio_dev;  in iio_dummy_probe()
607 	 *    indio_dev->name = id->name;  in iio_dummy_probe()
608 	 *    indio_dev->name = spi_get_device_id(spi)->name;  in iio_dummy_probe()
610 	indio_dev->name = kstrdup(name, GFP_KERNEL);  in iio_dummy_probe()
611 	if (!indio_dev->name) {  in iio_dummy_probe()
612 		ret = -ENOMEM;  in iio_dummy_probe()
617 	indio_dev->channels = iio_dummy_channels;  in iio_dummy_probe()
618 	indio_dev->num_channels = ARRAY_SIZE(iio_dummy_channels);  in iio_dummy_probe()
624 	indio_dev->info = &iio_dummy_info;  in iio_dummy_probe()
627 	indio_dev->modes = INDIO_DIRECT_MODE;  in iio_dummy_probe()
630 	if (ret < 0)  in iio_dummy_probe()
634 	if (ret < 0)  in iio_dummy_probe()
638 	if (ret < 0)  in iio_dummy_probe()
649 	kfree(indio_dev->name);  in iio_dummy_probe()
658  * iio_dummy_remove() - device instance removal function
671 	struct iio_dev *indio_dev = swd->device;  in iio_dummy_remove()
684 	kfree(indio_dev->name);  in iio_dummy_remove()
687 	return 0;  in iio_dummy_remove()
691  * module_iio_sw_device_driver() -  device driver registration
696  * Documentation/i2c/writing-clients.rst
698  * Documentation/spi/spi-summary.rst