1 // SPDX-License-Identifier: GPL-2.0
3  * Analog Devices AD7768-1 SPI ADC driver
156 	struct regulator *vref;  member
185 	shift = 32 - (8 * len);  in ad7768_spi_reg_read()
186 	st->data.d8[0] = AD7768_RD_FLAG_MSK(addr);  in ad7768_spi_reg_read()
188 	ret = spi_write_then_read(st->spi, st->data.d8, 1,  in ad7768_spi_reg_read()
189 				  &st->data.d32, len);  in ad7768_spi_reg_read()
193 	return (be32_to_cpu(st->data.d32) >> shift);  in ad7768_spi_reg_read()
200 	st->data.d8[0] = AD7768_WR_FLAG_MSK(addr);  in ad7768_spi_reg_write()
201 	st->data.d8[1] = val & 0xFF;  in ad7768_spi_reg_write()
203 	return spi_write(st->spi, st->data.d8, 2);  in ad7768_spi_reg_write()
226 	reinit_completion(&st->completion);  in ad7768_scan_direct()
232 	ret = wait_for_completion_timeout(&st->completion,  in ad7768_scan_direct()
235 		return -ETIMEDOUT;  in ad7768_scan_direct()
241 	 * Any SPI configuration of the AD7768-1 can only be  in ad7768_scan_direct()
259 	mutex_lock(&st->lock);  in ad7768_reg_access()
270 	mutex_unlock(&st->lock);  in ad7768_reg_access()
290 	/* A sync-in pulse is required every time the filter dec rate changes */  in ad7768_set_dig_fil()
291 	gpiod_set_value(st->gpio_sync_in, 1);  in ad7768_set_dig_fil()
292 	gpiod_set_value(st->gpio_sync_in, 0);  in ad7768_set_dig_fil()
306 	res = DIV_ROUND_CLOSEST(st->mclk_freq, freq);  in ad7768_set_freq()
310 		diff_new = abs(res - ad7768_clk_config[i].clk_div);  in ad7768_set_freq()
331 	st->samp_freq = DIV_ROUND_CLOSEST(st->mclk_freq,  in ad7768_set_freq()
347 		freq = DIV_ROUND_CLOSEST(st->mclk_freq,  in ad7768_sampling_freq_avail()
349 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", freq);  in ad7768_sampling_freq_avail()
352 	buf[len - 1] = '\n';  in ad7768_sampling_freq_avail()
383 		scale_uv = regulator_get_voltage(st->vref);  in ad7768_read_raw()
388 		*val2 = chan->scan_type.realbits;  in ad7768_read_raw()
393 		*val = st->samp_freq;  in ad7768_read_raw()
398 	return -EINVAL;  in ad7768_read_raw()
411 		return -EINVAL;  in ad7768_write_raw()
420 	return sprintf(label, "%s\n", st->labels[chan->channel]);  in ad7768_read_label()
458 	st->gpio_sync_in = devm_gpiod_get(&st->spi->dev, "adi,sync-in",  in ad7768_setup()
460 	if (IS_ERR(st->gpio_sync_in))  in ad7768_setup()
461 		return PTR_ERR(st->gpio_sync_in);  in ad7768_setup()
467 static irqreturn_t ad7768_trigger_handler(int irq, void *p)  in ad7768_trigger_handler()  argument
469 	struct iio_poll_func *pf = p;  in ad7768_trigger_handler()
470 	struct iio_dev *indio_dev = pf->indio_dev;  in ad7768_trigger_handler()
474 	mutex_lock(&st->lock);  in ad7768_trigger_handler()
476 	ret = spi_read(st->spi, &st->data.scan.chan, 3);  in ad7768_trigger_handler()
480 	iio_push_to_buffers_with_timestamp(indio_dev, &st->data.scan,  in ad7768_trigger_handler()
484 	iio_trigger_notify_done(indio_dev->trig);  in ad7768_trigger_handler()
485 	mutex_unlock(&st->lock);  in ad7768_trigger_handler()
496 		iio_trigger_poll(st->trig);  in ad7768_interrupt()
498 		complete(&st->completion);  in ad7768_interrupt()
510 	 * initial 8-bit write to query the ADC_DATA register.  in ad7768_buffer_postenable()
539 	regulator_disable(st->vref);  in ad7768_regulator_disable()
546 	struct device *device = indio_dev->dev.parent;  in ad7768_set_channel_label()
560 		st->labels[crt_ch] = label;  in ad7768_set_channel_label()
572 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7768_probe()
574 		return -ENOMEM;  in ad7768_probe()
577 	st->spi = spi;  in ad7768_probe()
579 	st->vref = devm_regulator_get(&spi->dev, "vref");  in ad7768_probe()
580 	if (IS_ERR(st->vref))  in ad7768_probe()
581 		return PTR_ERR(st->vref);  in ad7768_probe()
583 	ret = regulator_enable(st->vref);  in ad7768_probe()
585 		dev_err(&spi->dev, "Failed to enable specified vref supply\n");  in ad7768_probe()
589 	ret = devm_add_action_or_reset(&spi->dev, ad7768_regulator_disable, st);  in ad7768_probe()
593 	st->mclk = devm_clk_get_enabled(&spi->dev, "mclk");  in ad7768_probe()
594 	if (IS_ERR(st->mclk))  in ad7768_probe()
595 		return PTR_ERR(st->mclk);  in ad7768_probe()
597 	st->mclk_freq = clk_get_rate(st->mclk);  in ad7768_probe()
599 	mutex_init(&st->lock);  in ad7768_probe()
601 	indio_dev->channels = ad7768_channels;  in ad7768_probe()
602 	indio_dev->num_channels = ARRAY_SIZE(ad7768_channels);  in ad7768_probe()
603 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7768_probe()
604 	indio_dev->info = &ad7768_info;  in ad7768_probe()
605 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad7768_probe()
609 		dev_err(&spi->dev, "AD7768 setup failed\n");  in ad7768_probe()
613 	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",  in ad7768_probe()
614 					  indio_dev->name,  in ad7768_probe()
616 	if (!st->trig)  in ad7768_probe()
617 		return -ENOMEM;  in ad7768_probe()
619 	st->trig->ops = &ad7768_trigger_ops;  in ad7768_probe()
620 	iio_trigger_set_drvdata(st->trig, indio_dev);  in ad7768_probe()
621 	ret = devm_iio_trigger_register(&spi->dev, st->trig);  in ad7768_probe()
625 	indio_dev->trig = iio_trigger_get(st->trig);  in ad7768_probe()
627 	init_completion(&st->completion);  in ad7768_probe()
633 	ret = devm_request_irq(&spi->dev, spi->irq,  in ad7768_probe()
636 			       indio_dev->name, indio_dev);  in ad7768_probe()
640 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,  in ad7768_probe()
647 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad7768_probe()
651 	{ "ad7768-1", 0 },
657 	{ .compatible = "adi,ad7768-1" },
664 		.name = "ad7768-1",
673 MODULE_DESCRIPTION("Analog Devices AD7768-1 ADC driver");