1 // SPDX-License-Identifier: GPL-2.0-only
3  * ADC12130/ADC12132/ADC12138 12-bit plus sign ADC driver
132 		.tx_buf = adc->tx_buf,  in adc12138_mode_programming()
133 		.rx_buf = adc->rx_buf,  in adc12138_mode_programming()
139 	if (adc->id != adc12138)  in adc12138_mode_programming()
142 	adc->tx_buf[0] = mode;  in adc12138_mode_programming()
144 	ret = spi_sync_transfer(adc->spi, &xfer, 1);  in adc12138_mode_programming()
148 	memcpy(rx_buf, adc->rx_buf, len);  in adc12138_mode_programming()
172 	u8 mode = (ch_to_mux[channel->channel] << 4) |  in __adc12138_start_conv()
173 		  (channel->differential ? 0 : 0x80);  in __adc12138_start_conv()
202 	if (!wait_for_completion_timeout(&adc->complete, timeout))  in adc12138_wait_eoc()
203 		return -ETIMEDOUT;  in adc12138_wait_eoc()
214 	reinit_completion(&adc->complete);  in adc12138_adc_conversion()
237 		mutex_lock(&adc->lock);  in adc12138_read_raw()
239 		mutex_unlock(&adc->lock);  in adc12138_read_raw()
243 		*value = sign_extend32(be16_to_cpu(data) >> channel->scan_type.shift,  in adc12138_read_raw()
244 				       channel->scan_type.realbits - 1);  in adc12138_read_raw()
248 		ret = regulator_get_voltage(adc->vref_p);  in adc12138_read_raw()
253 		if (!IS_ERR(adc->vref_n)) {  in adc12138_read_raw()
254 			ret = regulator_get_voltage(adc->vref_n);  in adc12138_read_raw()
257 			*value -= ret;  in adc12138_read_raw()
262 		*shift = channel->scan_type.realbits - 1;  in adc12138_read_raw()
266 		if (!IS_ERR(adc->vref_n)) {  in adc12138_read_raw()
267 			*value = regulator_get_voltage(adc->vref_n);  in adc12138_read_raw()
280 	return -EINVAL;  in adc12138_read_raw()
294 	reinit_completion(&adc->complete);  in adc12138_init()
309 		dev_warn(&adc->spi->dev,  in adc12138_init()
312 		return -EIO;  in adc12138_init()
315 	switch (adc->acquisition_time) {  in adc12138_init()
329 		return -EINVAL;  in adc12138_init()
335 static irqreturn_t adc12138_trigger_handler(int irq, void *p)  in adc12138_trigger_handler()  argument
337 	struct iio_poll_func *pf = p;  in adc12138_trigger_handler()
338 	struct iio_dev *indio_dev = pf->indio_dev;  in adc12138_trigger_handler()
345 	mutex_lock(&adc->lock);  in adc12138_trigger_handler()
347 	for_each_set_bit(scan_index, indio_dev->active_scan_mask,  in adc12138_trigger_handler()
348 			 indio_dev->masklength) {  in adc12138_trigger_handler()
350 				&indio_dev->channels[scan_index];  in adc12138_trigger_handler()
352 		reinit_completion(&adc->complete);  in adc12138_trigger_handler()
355 					i ? &adc->data[i - 1] : &trash);  in adc12138_trigger_handler()
357 			dev_warn(&adc->spi->dev,  in adc12138_trigger_handler()
364 			dev_warn(&adc->spi->dev, "wait eoc timeout\n");  in adc12138_trigger_handler()
372 		ret = adc12138_read_conv_data(adc, &adc->data[i - 1]);  in adc12138_trigger_handler()
374 			dev_warn(&adc->spi->dev,  in adc12138_trigger_handler()
380 	iio_push_to_buffers_with_timestamp(indio_dev, adc->data,  in adc12138_trigger_handler()
383 	mutex_unlock(&adc->lock);  in adc12138_trigger_handler()
385 	iio_trigger_notify_done(indio_dev->trig);  in adc12138_trigger_handler()
390 static irqreturn_t adc12138_eoc_handler(int irq, void *p)  in adc12138_eoc_handler()  argument
392 	struct iio_dev *indio_dev = p;  in adc12138_eoc_handler()
395 	complete(&adc->complete);  in adc12138_eoc_handler()
406 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));  in adc12138_probe()
408 		return -ENOMEM;  in adc12138_probe()
411 	adc->spi = spi;  in adc12138_probe()
412 	adc->id = spi_get_device_id(spi)->driver_data;  in adc12138_probe()
413 	mutex_init(&adc->lock);  in adc12138_probe()
414 	init_completion(&adc->complete);  in adc12138_probe()
416 	indio_dev->name = spi_get_device_id(spi)->name;  in adc12138_probe()
417 	indio_dev->info = &adc12138_info;  in adc12138_probe()
418 	indio_dev->modes = INDIO_DIRECT_MODE;  in adc12138_probe()
420 	switch (adc->id) {  in adc12138_probe()
423 		indio_dev->channels = adc12132_channels;  in adc12138_probe()
424 		indio_dev->num_channels = ARRAY_SIZE(adc12132_channels);  in adc12138_probe()
427 		indio_dev->channels = adc12138_channels;  in adc12138_probe()
428 		indio_dev->num_channels = ARRAY_SIZE(adc12138_channels);  in adc12138_probe()
431 		return -EINVAL;  in adc12138_probe()
434 	ret = device_property_read_u32(&spi->dev, "ti,acquisition-time",  in adc12138_probe()
435 				       &adc->acquisition_time);  in adc12138_probe()
437 		adc->acquisition_time = 10;  in adc12138_probe()
439 	adc->cclk = devm_clk_get(&spi->dev, NULL);  in adc12138_probe()
440 	if (IS_ERR(adc->cclk))  in adc12138_probe()
441 		return PTR_ERR(adc->cclk);  in adc12138_probe()
443 	adc->vref_p = devm_regulator_get(&spi->dev, "vref-p");  in adc12138_probe()
444 	if (IS_ERR(adc->vref_p))  in adc12138_probe()
445 		return PTR_ERR(adc->vref_p);  in adc12138_probe()
447 	adc->vref_n = devm_regulator_get_optional(&spi->dev, "vref-n");  in adc12138_probe()
448 	if (IS_ERR(adc->vref_n)) {  in adc12138_probe()
453 		ret = PTR_ERR(adc->vref_n);  in adc12138_probe()
454 		if (ret != -ENODEV)  in adc12138_probe()
458 	ret = devm_request_irq(&spi->dev, spi->irq, adc12138_eoc_handler,  in adc12138_probe()
459 			       IRQF_TRIGGER_RISING, indio_dev->name, indio_dev);  in adc12138_probe()
463 	ret = clk_prepare_enable(adc->cclk);  in adc12138_probe()
467 	ret = regulator_enable(adc->vref_p);  in adc12138_probe()
471 	if (!IS_ERR(adc->vref_n)) {  in adc12138_probe()
472 		ret = regulator_enable(adc->vref_n);  in adc12138_probe()
496 	if (!IS_ERR(adc->vref_n))  in adc12138_probe()
497 		regulator_disable(adc->vref_n);  in adc12138_probe()
499 	regulator_disable(adc->vref_p);  in adc12138_probe()
501 	clk_disable_unprepare(adc->cclk);  in adc12138_probe()
513 	if (!IS_ERR(adc->vref_n))  in adc12138_remove()
514 		regulator_disable(adc->vref_n);  in adc12138_remove()
515 	regulator_disable(adc->vref_p);  in adc12138_remove()
516 	clk_disable_unprepare(adc->cclk);  in adc12138_remove()