1 // SPDX-License-Identifier: GPL-2.0
3  * Analog Devices AD7768-1 SPI ADC driver
17 #include <linux/spi/spi.h>
155 	struct spi_device *spi;  member
184 	shift = 32 - (8 * len);  in ad7768_spi_reg_read()
185 	st->data.d8[0] = AD7768_RD_FLAG_MSK(addr);  in ad7768_spi_reg_read()
187 	ret = spi_write_then_read(st->spi, st->data.d8, 1,  in ad7768_spi_reg_read()
188 				  &st->data.d32, len);  in ad7768_spi_reg_read()
192 	return (be32_to_cpu(st->data.d32) >> shift);  in ad7768_spi_reg_read()
199 	st->data.d8[0] = AD7768_WR_FLAG_MSK(addr);  in ad7768_spi_reg_write()
200 	st->data.d8[1] = val & 0xFF;  in ad7768_spi_reg_write()
202 	return spi_write(st->spi, st->data.d8, 2);  in ad7768_spi_reg_write()
225 	reinit_completion(&st->completion);  in ad7768_scan_direct()
231 	ret = wait_for_completion_timeout(&st->completion,  in ad7768_scan_direct()
234 		return -ETIMEDOUT;  in ad7768_scan_direct()
240 	 * Any SPI configuration of the AD7768-1 can only be  in ad7768_scan_direct()
259 		return -EBUSY;  in ad7768_reg_access()
291 	/* A sync-in pulse is required every time the filter dec rate changes */  in ad7768_set_dig_fil()
292 	gpiod_set_value(st->gpio_sync_in, 1);  in ad7768_set_dig_fil()
293 	gpiod_set_value(st->gpio_sync_in, 0);  in ad7768_set_dig_fil()
307 	res = DIV_ROUND_CLOSEST(st->mclk_freq, freq);  in ad7768_set_freq()
311 		diff_new = abs(res - ad7768_clk_config[i].clk_div);  in ad7768_set_freq()
332 	st->samp_freq = DIV_ROUND_CLOSEST(st->mclk_freq,  in ad7768_set_freq()
348 		freq = DIV_ROUND_CLOSEST(st->mclk_freq,  in ad7768_sampling_freq_avail()
350 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", freq);  in ad7768_sampling_freq_avail()
353 	buf[len - 1] = '\n';  in ad7768_sampling_freq_avail()
370 			return -EBUSY;  in ad7768_read_raw()
377 		*val = sign_extend32(ret, chan->scan_type.realbits - 1);  in ad7768_read_raw()
382 		scale_uv = regulator_get_voltage(st->vref);  in ad7768_read_raw()
387 		*val2 = chan->scan_type.realbits;  in ad7768_read_raw()
392 		*val = st->samp_freq;  in ad7768_read_raw()
397 	return -EINVAL;  in ad7768_read_raw()
410 		return -EINVAL;  in ad7768_write_raw()
419 	return sprintf(label, "%s\n", st->labels[chan->channel]);  in ad7768_read_label()
445 	 * a software reset. The bits must first be set to 11, and then  in ad7768_setup()
457 	st->gpio_sync_in = devm_gpiod_get(&st->spi->dev, "adi,sync-in",  in ad7768_setup()
459 	if (IS_ERR(st->gpio_sync_in))  in ad7768_setup()
460 		return PTR_ERR(st->gpio_sync_in);  in ad7768_setup()
469 	struct iio_dev *indio_dev = pf->indio_dev;  in ad7768_trigger_handler()
473 	ret = spi_read(st->spi, &st->data.scan.chan, 3);  in ad7768_trigger_handler()
477 	iio_push_to_buffers_with_timestamp(indio_dev, &st->data.scan,  in ad7768_trigger_handler()
481 	iio_trigger_notify_done(indio_dev->trig);  in ad7768_trigger_handler()
492 		iio_trigger_poll(st->trig);  in ad7768_interrupt()
494 		complete(&st->completion);  in ad7768_interrupt()
504 	 * Write a 1 to the LSB of the INTERFACE_FORMAT register to enter  in ad7768_buffer_postenable()
506 	 * initial 8-bit write to query the ADC_DATA register.  in ad7768_buffer_postenable()
535 	regulator_disable(st->vref);  in ad7768_regulator_disable()
542 	struct device *device = indio_dev->dev.parent;  in ad7768_set_channel_label()
556 		st->labels[crt_ch] = label;  in ad7768_set_channel_label()
562 static int ad7768_probe(struct spi_device *spi)  in ad7768_probe()  argument
568 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7768_probe()
570 		return -ENOMEM;  in ad7768_probe()
575 	 * clocked out of the controller and the spi clock is free running,  in ad7768_probe()
581 	if (spi->controller->mode_bits & SPI_MOSI_IDLE_HIGH) {  in ad7768_probe()
582 		spi->mode |= SPI_MOSI_IDLE_HIGH;  in ad7768_probe()
583 		ret = spi_setup(spi);  in ad7768_probe()
588 	st->spi = spi;  in ad7768_probe()
590 	st->vref = devm_regulator_get(&spi->dev, "vref");  in ad7768_probe()
591 	if (IS_ERR(st->vref))  in ad7768_probe()
592 		return PTR_ERR(st->vref);  in ad7768_probe()
594 	ret = regulator_enable(st->vref);  in ad7768_probe()
596 		dev_err(&spi->dev, "Failed to enable specified vref supply\n");  in ad7768_probe()
600 	ret = devm_add_action_or_reset(&spi->dev, ad7768_regulator_disable, st);  in ad7768_probe()
604 	st->mclk = devm_clk_get_enabled(&spi->dev, "mclk");  in ad7768_probe()
605 	if (IS_ERR(st->mclk))  in ad7768_probe()
606 		return PTR_ERR(st->mclk);  in ad7768_probe()
608 	st->mclk_freq = clk_get_rate(st->mclk);  in ad7768_probe()
610 	indio_dev->channels = ad7768_channels;  in ad7768_probe()
611 	indio_dev->num_channels = ARRAY_SIZE(ad7768_channels);  in ad7768_probe()
612 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7768_probe()
613 	indio_dev->info = &ad7768_info;  in ad7768_probe()
614 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad7768_probe()
618 		dev_err(&spi->dev, "AD7768 setup failed\n");  in ad7768_probe()
622 	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",  in ad7768_probe()
623 					  indio_dev->name,  in ad7768_probe()
625 	if (!st->trig)  in ad7768_probe()
626 		return -ENOMEM;  in ad7768_probe()
628 	st->trig->ops = &ad7768_trigger_ops;  in ad7768_probe()
629 	iio_trigger_set_drvdata(st->trig, indio_dev);  in ad7768_probe()
630 	ret = devm_iio_trigger_register(&spi->dev, st->trig);  in ad7768_probe()
634 	indio_dev->trig = iio_trigger_get(st->trig);  in ad7768_probe()
636 	init_completion(&st->completion);  in ad7768_probe()
642 	ret = devm_request_irq(&spi->dev, spi->irq,  in ad7768_probe()
645 			       indio_dev->name, indio_dev);  in ad7768_probe()
649 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,  in ad7768_probe()
656 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad7768_probe()
660 	{ "ad7768-1", 0 },
663 MODULE_DEVICE_TABLE(spi, ad7768_id_table);
666 	{ .compatible = "adi,ad7768-1" },
673 		.name = "ad7768-1",
682 MODULE_DESCRIPTION("Analog Devices AD7768-1 ADC driver");