226 		dev_warn(&indio_dev->dev, "trigger mode already enabled");  in max1027_read_single_value()
227 		return -EBUSY;  in max1027_read_single_value()
230 	/* Start acquisition on conversion register write */  in max1027_read_single_value()
231 	st->reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2 | MAX1027_CKS_MODE2;  in max1027_read_single_value()
232 	ret = spi_write(st->spi, &st->reg, 1);  in max1027_read_single_value()
234 		dev_err(&indio_dev->dev,  in max1027_read_single_value()
240 	st->reg = MAX1027_CONV_REG | MAX1027_CHAN(chan->channel) |  in max1027_read_single_value()
242 	if (chan->type == IIO_TEMP)  in max1027_read_single_value()
243 		st->reg |= MAX1027_TEMP;  in max1027_read_single_value()
244 	ret = spi_write(st->spi, &st->reg, 1);  in max1027_read_single_value()
246 		dev_err(&indio_dev->dev,  in max1027_read_single_value()
253 	 * conversion register), the interrupt doesn't occur every time.  in max1027_read_single_value()
259 	ret = spi_read(st->spi, st->buffer, (chan->type == IIO_TEMP) ? 4 : 2);  in max1027_read_single_value()
263 	*val = be16_to_cpu(st->buffer[0]);  in max1027_read_single_value()
275 	mutex_lock(&st->lock);  in max1027_read_raw()
282 		switch (chan->type) {  in max1027_read_raw()
294 			ret = -EINVAL;  in max1027_read_raw()
299 		ret = -EINVAL;  in max1027_read_raw()
303 	mutex_unlock(&st->lock);  in max1027_read_raw()
313 	u8 *val = (u8 *)st->buffer;  in max1027_debugfs_reg_access()
316 		return -EINVAL;  in max1027_debugfs_reg_access()
319 	return spi_write(st->spi, val, 1);  in max1027_debugfs_reg_access()
327 	if (st->trig != trig)  in max1027_validate_trigger()
328 		return -EINVAL;  in max1027_validate_trigger()
340 		/* Start acquisition on cnvst */  in max1027_set_trigger_state()
341 		st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE0 |  in max1027_set_trigger_state()
343 		ret = spi_write(st->spi, &st->reg, 1);  in max1027_set_trigger_state()
348 		st->reg = MAX1027_CONV_REG | MAX1027_CHAN(0) |  in max1027_set_trigger_state()
350 		ret = spi_write(st->spi, &st->reg, 1);  in max1027_set_trigger_state()
354 		/* Start acquisition on conversion register write */  in max1027_set_trigger_state()
355 		st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE2	|  in max1027_set_trigger_state()
357 		ret = spi_write(st->spi, &st->reg, 1);  in max1027_set_trigger_state()
368 	struct iio_dev *indio_dev = pf->indio_dev;  in max1027_trigger_handler()
374 	spi_read(st->spi, st->buffer, indio_dev->masklength * 2);  in max1027_trigger_handler()
376 	iio_push_to_buffers(indio_dev, st->buffer);  in max1027_trigger_handler()
378 	iio_trigger_notify_done(indio_dev->trig);  in max1027_trigger_handler()
402 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in max1027_probe()
405 		return -ENOMEM;  in max1027_probe()
411 	st->spi = spi;  in max1027_probe()
412 	st->info = &max1027_chip_info_tbl[spi_get_device_id(spi)->driver_data];  in max1027_probe()
414 	mutex_init(&st->lock);  in max1027_probe()
416 	indio_dev->name = spi_get_device_id(spi)->name;  in max1027_probe()
417 	indio_dev->dev.parent = &spi->dev;  in max1027_probe()
418 	indio_dev->dev.of_node = spi->dev.of_node;  in max1027_probe()
419 	indio_dev->info = &max1027_info;  in max1027_probe()
420 	indio_dev->modes = INDIO_DIRECT_MODE;  in max1027_probe()
421 	indio_dev->channels = st->info->channels;  in max1027_probe()
422 	indio_dev->num_channels = st->info->num_channels;  in max1027_probe()
423 	indio_dev->available_scan_masks = st->info->available_scan_masks;  in max1027_probe()
425 	st->buffer = devm_kmalloc_array(&indio_dev->dev,  in max1027_probe()
426 				  indio_dev->num_channels, 2,  in max1027_probe()
428 	if (st->buffer == NULL) {  in max1027_probe()
429 		dev_err(&indio_dev->dev, "Can't allocate buffer\n");  in max1027_probe()
430 		return -ENOMEM;  in max1027_probe()
436 		dev_err(&indio_dev->dev, "Failed to setup buffer\n");  in max1027_probe()
440 	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",  in max1027_probe()
441 							indio_dev->name);  in max1027_probe()
442 	if (st->trig == NULL) {  in max1027_probe()
443 		ret = -ENOMEM;  in max1027_probe()
444 		dev_err(&indio_dev->dev, "Failed to allocate iio trigger\n");  in max1027_probe()
448 	st->trig->ops = &max1027_trigger_ops;  in max1027_probe()
449 	st->trig->dev.parent = &spi->dev;  in max1027_probe()
450 	iio_trigger_set_drvdata(st->trig, indio_dev);  in max1027_probe()
451 	iio_trigger_register(st->trig);  in max1027_probe()
453 	ret = devm_request_threaded_irq(&spi->dev, spi->irq,  in max1027_probe()
457 					spi->dev.driver->name, st->trig);  in max1027_probe()
459 		dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");  in max1027_probe()
464 	st->reg = MAX1027_RST_REG;  in max1027_probe()
465 	ret = spi_write(st->spi, &st->reg, 1);  in max1027_probe()
467 		dev_err(&indio_dev->dev, "Failed to reset the ADC\n");  in max1027_probe()
472 	st->reg = MAX1027_AVG_REG;  in max1027_probe()
473 	ret = spi_write(st->spi, &st->reg, 1);  in max1027_probe()
475 		dev_err(&indio_dev->dev, "Failed to configure averaging register\n");  in max1027_probe()
481 		dev_err(&indio_dev->dev, "Failed to register iio device\n");  in max1027_probe()