1 // SPDX-License-Identifier: GPL-2.0-only
3  * ADC12130/ADC12132/ADC12138 12-bit plus sign ADC driver
48 	/* The number of cclk periods for the S/H's acquisition time */
131 		.tx_buf = adc->tx_buf,  in adc12138_mode_programming()
132 		.rx_buf = adc->rx_buf,  in adc12138_mode_programming()
138 	if (adc->id != adc12138)  in adc12138_mode_programming()
141 	adc->tx_buf[0] = mode;  in adc12138_mode_programming()
143 	ret = spi_sync_transfer(adc->spi, &xfer, 1);  in adc12138_mode_programming()
147 	memcpy(rx_buf, adc->rx_buf, len);  in adc12138_mode_programming()
171 	u8 mode = (ch_to_mux[channel->channel] << 4) |  in __adc12138_start_conv()
172 		  (channel->differential ? 0 : 0x80);  in __adc12138_start_conv()
201 	if (!wait_for_completion_timeout(&adc->complete, timeout))  in adc12138_wait_eoc()
202 		return -ETIMEDOUT;  in adc12138_wait_eoc()
213 	reinit_completion(&adc->complete);  in adc12138_adc_conversion()
236 		mutex_lock(&adc->lock);  in adc12138_read_raw()
238 		mutex_unlock(&adc->lock);  in adc12138_read_raw()
246 		ret = regulator_get_voltage(adc->vref_p);  in adc12138_read_raw()
251 		if (!IS_ERR(adc->vref_n)) {  in adc12138_read_raw()
252 			ret = regulator_get_voltage(adc->vref_n);  in adc12138_read_raw()
255 			*value -= ret;  in adc12138_read_raw()
260 		*shift = channel->scan_type.realbits - 1;  in adc12138_read_raw()
264 		if (!IS_ERR(adc->vref_n)) {  in adc12138_read_raw()
265 			*value = regulator_get_voltage(adc->vref_n);  in adc12138_read_raw()
278 	return -EINVAL;  in adc12138_read_raw()
292 	reinit_completion(&adc->complete);  in adc12138_init()
298 	/* data output at this time has no significance */  in adc12138_init()
307 		dev_warn(&adc->spi->dev,  in adc12138_init()
310 		return -EIO;  in adc12138_init()
313 	switch (adc->acquisition_time) {  in adc12138_init()
327 		return -EINVAL;  in adc12138_init()
336 	struct iio_dev *indio_dev = pf->indio_dev;  in adc12138_trigger_handler()
343 	mutex_lock(&adc->lock);  in adc12138_trigger_handler()
345 	for_each_set_bit(scan_index, indio_dev->active_scan_mask,  in adc12138_trigger_handler()
346 			 indio_dev->masklength) {  in adc12138_trigger_handler()
348 				&indio_dev->channels[scan_index];  in adc12138_trigger_handler()
350 		reinit_completion(&adc->complete);  in adc12138_trigger_handler()
353 					i ? &adc->data[i - 1] : &trash);  in adc12138_trigger_handler()
355 			dev_warn(&adc->spi->dev,  in adc12138_trigger_handler()
362 			dev_warn(&adc->spi->dev, "wait eoc timeout\n");  in adc12138_trigger_handler()
370 		ret = adc12138_read_conv_data(adc, &adc->data[i - 1]);  in adc12138_trigger_handler()
372 			dev_warn(&adc->spi->dev,  in adc12138_trigger_handler()
378 	iio_push_to_buffers_with_timestamp(indio_dev, adc->data,  in adc12138_trigger_handler()
381 	mutex_unlock(&adc->lock);  in adc12138_trigger_handler()
383 	iio_trigger_notify_done(indio_dev->trig);  in adc12138_trigger_handler()
393 	complete(&adc->complete);  in adc12138_eoc_handler()
404 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));  in adc12138_probe()
406 		return -ENOMEM;  in adc12138_probe()
409 	adc->spi = spi;  in adc12138_probe()
410 	adc->id = spi_get_device_id(spi)->driver_data;  in adc12138_probe()
411 	mutex_init(&adc->lock);  in adc12138_probe()
412 	init_completion(&adc->complete);  in adc12138_probe()
414 	indio_dev->name = spi_get_device_id(spi)->name;  in adc12138_probe()
415 	indio_dev->info = &adc12138_info;  in adc12138_probe()
416 	indio_dev->modes = INDIO_DIRECT_MODE;  in adc12138_probe()
418 	switch (adc->id) {  in adc12138_probe()
421 		indio_dev->channels = adc12132_channels;  in adc12138_probe()
422 		indio_dev->num_channels = ARRAY_SIZE(adc12132_channels);  in adc12138_probe()
425 		indio_dev->channels = adc12138_channels;  in adc12138_probe()
426 		indio_dev->num_channels = ARRAY_SIZE(adc12138_channels);  in adc12138_probe()
429 		return -EINVAL;  in adc12138_probe()
432 	ret = of_property_read_u32(spi->dev.of_node, "ti,acquisition-time",  in adc12138_probe()
433 				   &adc->acquisition_time);  in adc12138_probe()
435 		adc->acquisition_time = 10;  in adc12138_probe()
437 	adc->cclk = devm_clk_get(&spi->dev, NULL);  in adc12138_probe()
438 	if (IS_ERR(adc->cclk))  in adc12138_probe()
439 		return PTR_ERR(adc->cclk);  in adc12138_probe()
441 	adc->vref_p = devm_regulator_get(&spi->dev, "vref-p");  in adc12138_probe()
442 	if (IS_ERR(adc->vref_p))  in adc12138_probe()
443 		return PTR_ERR(adc->vref_p);  in adc12138_probe()
445 	adc->vref_n = devm_regulator_get_optional(&spi->dev, "vref-n");  in adc12138_probe()
446 	if (IS_ERR(adc->vref_n)) {  in adc12138_probe()
451 		ret = PTR_ERR(adc->vref_n);  in adc12138_probe()
452 		if (ret != -ENODEV)  in adc12138_probe()
456 	ret = devm_request_irq(&spi->dev, spi->irq, adc12138_eoc_handler,  in adc12138_probe()
457 			       IRQF_TRIGGER_RISING, indio_dev->name, indio_dev);  in adc12138_probe()
461 	ret = clk_prepare_enable(adc->cclk);  in adc12138_probe()
465 	ret = regulator_enable(adc->vref_p);  in adc12138_probe()
469 	if (!IS_ERR(adc->vref_n)) {  in adc12138_probe()
470 		ret = regulator_enable(adc->vref_n);  in adc12138_probe()
494 	if (!IS_ERR(adc->vref_n))  in adc12138_probe()
495 		regulator_disable(adc->vref_n);  in adc12138_probe()
497 	regulator_disable(adc->vref_p);  in adc12138_probe()
499 	clk_disable_unprepare(adc->cclk);  in adc12138_probe()
511 	if (!IS_ERR(adc->vref_n))  in adc12138_remove()
512 		regulator_disable(adc->vref_n);  in adc12138_remove()
513 	regulator_disable(adc->vref_p);  in adc12138_remove()
514 	clk_disable_unprepare(adc->cclk);  in adc12138_remove()