1 // SPDX-License-Identifier: GPL-2.0-only
14 #include <linux/spi/spi.h>
59  * struct ad5421_state - driver instance specific data
60  * @spi:		spi_device
63  * @data:		spi transfer buffers
65  * @lock:		lock to protect the data buffer during SPI ops
68 	struct spi_device		*spi;  member
128 		.channel = -1,
139 	st->data[0].d32 = cpu_to_be32((reg << 16) | val);  in ad5421_write_unlocked()
141 	return spi_write(st->spi, &st->data[0].d8[1], 3);  in ad5421_write_unlocked()
150 	mutex_lock(&st->lock);  in ad5421_write()
152 	mutex_unlock(&st->lock);  in ad5421_write()
163 			.tx_buf = &st->data[0].d8[1],  in ad5421_read()
167 			.rx_buf = &st->data[1].d8[1],  in ad5421_read()
172 	mutex_lock(&st->lock);  in ad5421_read()
174 	st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16));  in ad5421_read()
176 	ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));  in ad5421_read()
178 		ret = be32_to_cpu(st->data[1].d32) & 0xffff;  in ad5421_read()
180 	mutex_unlock(&st->lock);  in ad5421_read()
191 	mutex_lock(&st->lock);  in ad5421_update_ctrl()
193 	st->ctrl &= ~clr;  in ad5421_update_ctrl()
194 	st->ctrl |= set;  in ad5421_update_ctrl()
196 	ret = ad5421_write_unlocked(indio_dev, AD5421_REG_CTRL, st->ctrl);  in ad5421_update_ctrl()
198 	mutex_unlock(&st->lock);  in ad5421_update_ctrl()
223 	/* The fault pin stays high as long as a fault condition is present and  in ad5421_fault_handler()
224 	 * it is not possible to mask fault conditions. For certain fault  in ad5421_fault_handler()
225 	 * conditions for example like over-temperature it takes some time  in ad5421_fault_handler()
229 	 * a interrupt condition is still present.  in ad5421_fault_handler()
239 		events &= st->fault_mask;  in ad5421_fault_handler()
285 	 * usually hard-wired and not run-time switchable. */  in ad5421_get_current_min_max()
286 	switch (st->current_range) {  in ad5421_get_current_min_max()
311 	return (min * (1 << 16)) / (max - min);  in ad5421_get_offset()
321 	if (chan->type != IIO_CURRENT)  in ad5421_read_raw()
322 		return -EINVAL;  in ad5421_read_raw()
333 		*val = max - min;  in ad5421_read_raw()
343 		*val = ret - 32768;  in ad5421_read_raw()
353 	return -EINVAL;  in ad5421_read_raw()
357 	struct iio_chan_spec const *chan, int val, int val2, long mask)  in ad5421_write_raw()  argument
361 	switch (mask) {  in ad5421_write_raw()
364 			return -EINVAL;  in ad5421_write_raw()
370 			return -EINVAL;  in ad5421_write_raw()
375 			return -EINVAL;  in ad5421_write_raw()
382 	return -EINVAL;  in ad5421_write_raw()
390 	unsigned int mask;  in ad5421_write_event_config()  local
392 	switch (chan->type) {  in ad5421_write_event_config()
395 			mask = AD5421_FAULT_OVER_CURRENT;  in ad5421_write_event_config()
397 			mask = AD5421_FAULT_UNDER_CURRENT;  in ad5421_write_event_config()
400 		mask = AD5421_FAULT_TEMP_OVER_140;  in ad5421_write_event_config()
403 		return -EINVAL;  in ad5421_write_event_config()
406 	mutex_lock(&st->lock);  in ad5421_write_event_config()
408 		st->fault_mask |= mask;  in ad5421_write_event_config()
410 		st->fault_mask &= ~mask;  in ad5421_write_event_config()
411 	mutex_unlock(&st->lock);  in ad5421_write_event_config()
421 	unsigned int mask;  in ad5421_read_event_config()  local
423 	switch (chan->type) {  in ad5421_read_event_config()
426 			mask = AD5421_FAULT_OVER_CURRENT;  in ad5421_read_event_config()
428 			mask = AD5421_FAULT_UNDER_CURRENT;  in ad5421_read_event_config()
431 		mask = AD5421_FAULT_TEMP_OVER_140;  in ad5421_read_event_config()
434 		return -EINVAL;  in ad5421_read_event_config()
437 	return (bool)(st->fault_mask & mask);  in ad5421_read_event_config()
447 	switch (chan->type) {  in ad5421_read_event_value()
458 		return -EINVAL;  in ad5421_read_event_value()
472 static int ad5421_probe(struct spi_device *spi)  in ad5421_probe()  argument
474 	struct ad5421_platform_data *pdata = dev_get_platdata(&spi->dev);  in ad5421_probe()
479 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad5421_probe()
481 		dev_err(&spi->dev, "Failed to allocate iio device\n");  in ad5421_probe()
482 		return  -ENOMEM;  in ad5421_probe()
486 	spi_set_drvdata(spi, indio_dev);  in ad5421_probe()
488 	st->spi = spi;  in ad5421_probe()
490 	indio_dev->name = "ad5421";  in ad5421_probe()
491 	indio_dev->info = &ad5421_info;  in ad5421_probe()
492 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad5421_probe()
493 	indio_dev->channels = ad5421_channels;  in ad5421_probe()
494 	indio_dev->num_channels = ARRAY_SIZE(ad5421_channels);  in ad5421_probe()
496 	mutex_init(&st->lock);  in ad5421_probe()
498 	st->ctrl = AD5421_CTRL_WATCHDOG_DISABLE |  in ad5421_probe()
502 		st->current_range = pdata->current_range;  in ad5421_probe()
503 		if (pdata->external_vref)  in ad5421_probe()
504 			st->ctrl |= AD5421_CTRL_PWR_DOWN_INT_VREF;  in ad5421_probe()
506 		st->current_range = AD5421_CURRENT_RANGE_4mA_20mA;  in ad5421_probe()
512 	if (spi->irq) {  in ad5421_probe()
513 		ret = devm_request_threaded_irq(&spi->dev, spi->irq,  in ad5421_probe()
523 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad5421_probe()
534 MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");
537 MODULE_ALIAS("spi:ad5421");