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
180 	shift = 32 - (8 * len);  in ad7768_spi_reg_read()
181 	st->data.d8[0] = AD7768_RD_FLAG_MSK(addr);  in ad7768_spi_reg_read()
183 	ret = spi_write_then_read(st->spi, st->data.d8, 1,  in ad7768_spi_reg_read()
184 				  &st->data.d32, len);  in ad7768_spi_reg_read()
188 	return (be32_to_cpu(st->data.d32) >> shift);  in ad7768_spi_reg_read()
195 	st->data.d8[0] = AD7768_WR_FLAG_MSK(addr);  in ad7768_spi_reg_write()
196 	st->data.d8[1] = val & 0xFF;  in ad7768_spi_reg_write()
198 	return spi_write(st->spi, st->data.d8, 2);  in ad7768_spi_reg_write()
221 	reinit_completion(&st->completion);  in ad7768_scan_direct()
227 	ret = wait_for_completion_timeout(&st->completion,  in ad7768_scan_direct()
230 		return -ETIMEDOUT;  in ad7768_scan_direct()
236 	 * Any SPI configuration of the AD7768-1 can only be  in ad7768_scan_direct()
254 	mutex_lock(&st->lock);  in ad7768_reg_access()
265 	mutex_unlock(&st->lock);  in ad7768_reg_access()
285 	/* A sync-in pulse is required every time the filter dec rate changes */  in ad7768_set_dig_fil()
286 	gpiod_set_value(st->gpio_sync_in, 1);  in ad7768_set_dig_fil()
287 	gpiod_set_value(st->gpio_sync_in, 0);  in ad7768_set_dig_fil()
301 	res = DIV_ROUND_CLOSEST(st->mclk_freq, freq);  in ad7768_set_freq()
305 		diff_new = abs(res - ad7768_clk_config[i].clk_div);  in ad7768_set_freq()
326 	st->samp_freq = DIV_ROUND_CLOSEST(st->mclk_freq,  in ad7768_set_freq()
342 		freq = DIV_ROUND_CLOSEST(st->mclk_freq,  in ad7768_sampling_freq_avail()
344 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", freq);  in ad7768_sampling_freq_avail()
347 	buf[len - 1] = '\n';  in ad7768_sampling_freq_avail()
378 		scale_uv = regulator_get_voltage(st->vref);  in ad7768_read_raw()
383 		*val2 = chan->scan_type.realbits;  in ad7768_read_raw()
388 		*val = st->samp_freq;  in ad7768_read_raw()
393 	return -EINVAL;  in ad7768_read_raw()
406 		return -EINVAL;  in ad7768_write_raw()
432 	 * a software reset. The bits must first be set to 11, and then  in ad7768_setup()
444 	st->gpio_sync_in = devm_gpiod_get(&st->spi->dev, "adi,sync-in",  in ad7768_setup()
446 	if (IS_ERR(st->gpio_sync_in))  in ad7768_setup()
447 		return PTR_ERR(st->gpio_sync_in);  in ad7768_setup()
456 	struct iio_dev *indio_dev = pf->indio_dev;  in ad7768_trigger_handler()
460 	mutex_lock(&st->lock);  in ad7768_trigger_handler()
462 	ret = spi_read(st->spi, &st->data.d32, 3);  in ad7768_trigger_handler()
466 	iio_push_to_buffers_with_timestamp(indio_dev, &st->data.d32,  in ad7768_trigger_handler()
469 	iio_trigger_notify_done(indio_dev->trig);  in ad7768_trigger_handler()
471 	mutex_unlock(&st->lock);  in ad7768_trigger_handler()
482 		iio_trigger_poll(st->trig);  in ad7768_interrupt()
484 		complete(&st->completion);  in ad7768_interrupt()
494 	 * Write a 1 to the LSB of the INTERFACE_FORMAT register to enter  in ad7768_buffer_postenable()
496 	 * initial 8-bit write to query the ADC_DATA register.  in ad7768_buffer_postenable()
525 	regulator_disable(st->vref);  in ad7768_regulator_disable()
532 	clk_disable_unprepare(st->mclk);  in ad7768_clk_disable()
535 static int ad7768_probe(struct spi_device *spi)  in ad7768_probe()  argument
541 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7768_probe()
543 		return -ENOMEM;  in ad7768_probe()
546 	st->spi = spi;  in ad7768_probe()
548 	st->vref = devm_regulator_get(&spi->dev, "vref");  in ad7768_probe()
549 	if (IS_ERR(st->vref))  in ad7768_probe()
550 		return PTR_ERR(st->vref);  in ad7768_probe()
552 	ret = regulator_enable(st->vref);  in ad7768_probe()
554 		dev_err(&spi->dev, "Failed to enable specified vref supply\n");  in ad7768_probe()
558 	ret = devm_add_action_or_reset(&spi->dev, ad7768_regulator_disable, st);  in ad7768_probe()
562 	st->mclk = devm_clk_get(&spi->dev, "mclk");  in ad7768_probe()
563 	if (IS_ERR(st->mclk))  in ad7768_probe()
564 		return PTR_ERR(st->mclk);  in ad7768_probe()
566 	ret = clk_prepare_enable(st->mclk);  in ad7768_probe()
570 	ret = devm_add_action_or_reset(&spi->dev, ad7768_clk_disable, st);  in ad7768_probe()
574 	st->mclk_freq = clk_get_rate(st->mclk);  in ad7768_probe()
576 	spi_set_drvdata(spi, indio_dev);  in ad7768_probe()
577 	mutex_init(&st->lock);  in ad7768_probe()
579 	indio_dev->channels = ad7768_channels;  in ad7768_probe()
580 	indio_dev->num_channels = ARRAY_SIZE(ad7768_channels);  in ad7768_probe()
581 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7768_probe()
582 	indio_dev->info = &ad7768_info;  in ad7768_probe()
583 	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_TRIGGERED;  in ad7768_probe()
587 		dev_err(&spi->dev, "AD7768 setup failed\n");  in ad7768_probe()
591 	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",  in ad7768_probe()
592 					  indio_dev->name, indio_dev->id);  in ad7768_probe()
593 	if (!st->trig)  in ad7768_probe()
594 		return -ENOMEM;  in ad7768_probe()
596 	st->trig->ops = &ad7768_trigger_ops;  in ad7768_probe()
597 	st->trig->dev.parent = &spi->dev;  in ad7768_probe()
598 	iio_trigger_set_drvdata(st->trig, indio_dev);  in ad7768_probe()
599 	ret = devm_iio_trigger_register(&spi->dev, st->trig);  in ad7768_probe()
603 	indio_dev->trig = iio_trigger_get(st->trig);  in ad7768_probe()
605 	init_completion(&st->completion);  in ad7768_probe()
607 	ret = devm_request_irq(&spi->dev, spi->irq,  in ad7768_probe()
610 			       indio_dev->name, indio_dev);  in ad7768_probe()
614 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,  in ad7768_probe()
621 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad7768_probe()
625 	{ "ad7768-1", 0 },
628 MODULE_DEVICE_TABLE(spi, ad7768_id_table);
631 	{ .compatible = "adi,ad7768-1" },
638 		.name = "ad7768-1",
647 MODULE_DESCRIPTION("Analog Devices AD7768-1 ADC driver");