1 // SPDX-License-Identifier: GPL-2.0
3  * Analog Devices AD7768-1 SPI ADC driver
156 	struct regulator *vref;  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()
258 	mutex_lock(&st->lock);  in ad7768_reg_access()
269 	mutex_unlock(&st->lock);  in ad7768_reg_access()
289 	/* A sync-in pulse is required every time the filter dec rate changes */  in ad7768_set_dig_fil()
290 	gpiod_set_value(st->gpio_sync_in, 1);  in ad7768_set_dig_fil()
291 	gpiod_set_value(st->gpio_sync_in, 0);  in ad7768_set_dig_fil()
305 	res = DIV_ROUND_CLOSEST(st->mclk_freq, freq);  in ad7768_set_freq()
309 		diff_new = abs(res - ad7768_clk_config[i].clk_div);  in ad7768_set_freq()
330 	st->samp_freq = DIV_ROUND_CLOSEST(st->mclk_freq,  in ad7768_set_freq()
346 		freq = DIV_ROUND_CLOSEST(st->mclk_freq,  in ad7768_sampling_freq_avail()
348 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", freq);  in ad7768_sampling_freq_avail()
351 	buf[len - 1] = '\n';  in ad7768_sampling_freq_avail()
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()
448 	st->gpio_sync_in = devm_gpiod_get(&st->spi->dev, "adi,sync-in",  in ad7768_setup()
450 	if (IS_ERR(st->gpio_sync_in))  in ad7768_setup()
451 		return PTR_ERR(st->gpio_sync_in);  in ad7768_setup()
457 static irqreturn_t ad7768_trigger_handler(int irq, void *p)  in ad7768_trigger_handler()  argument
459 	struct iio_poll_func *pf = p;  in ad7768_trigger_handler()
460 	struct iio_dev *indio_dev = pf->indio_dev;  in ad7768_trigger_handler()
464 	mutex_lock(&st->lock);  in ad7768_trigger_handler()
466 	ret = spi_read(st->spi, &st->data.scan.chan, 3);  in ad7768_trigger_handler()
470 	iio_push_to_buffers_with_timestamp(indio_dev, &st->data.scan,  in ad7768_trigger_handler()
474 	iio_trigger_notify_done(indio_dev->trig);  in ad7768_trigger_handler()
475 	mutex_unlock(&st->lock);  in ad7768_trigger_handler()
486 		iio_trigger_poll(st->trig);  in ad7768_interrupt()
488 		complete(&st->completion);  in ad7768_interrupt()
500 	 * initial 8-bit write to query the ADC_DATA register.  in ad7768_buffer_postenable()
529 	regulator_disable(st->vref);  in ad7768_regulator_disable()
536 	clk_disable_unprepare(st->mclk);  in ad7768_clk_disable()
545 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7768_probe()
547 		return -ENOMEM;  in ad7768_probe()
550 	st->spi = spi;  in ad7768_probe()
552 	st->vref = devm_regulator_get(&spi->dev, "vref");  in ad7768_probe()
553 	if (IS_ERR(st->vref))  in ad7768_probe()
554 		return PTR_ERR(st->vref);  in ad7768_probe()
556 	ret = regulator_enable(st->vref);  in ad7768_probe()
558 		dev_err(&spi->dev, "Failed to enable specified vref supply\n");  in ad7768_probe()
562 	ret = devm_add_action_or_reset(&spi->dev, ad7768_regulator_disable, st);  in ad7768_probe()
566 	st->mclk = devm_clk_get(&spi->dev, "mclk");  in ad7768_probe()
567 	if (IS_ERR(st->mclk))  in ad7768_probe()
568 		return PTR_ERR(st->mclk);  in ad7768_probe()
570 	ret = clk_prepare_enable(st->mclk);  in ad7768_probe()
574 	ret = devm_add_action_or_reset(&spi->dev, ad7768_clk_disable, st);  in ad7768_probe()
578 	st->mclk_freq = clk_get_rate(st->mclk);  in ad7768_probe()
581 	mutex_init(&st->lock);  in ad7768_probe()
583 	indio_dev->channels = ad7768_channels;  in ad7768_probe()
584 	indio_dev->num_channels = ARRAY_SIZE(ad7768_channels);  in ad7768_probe()
585 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7768_probe()
586 	indio_dev->info = &ad7768_info;  in ad7768_probe()
587 	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_TRIGGERED;  in ad7768_probe()
591 		dev_err(&spi->dev, "AD7768 setup failed\n");  in ad7768_probe()
595 	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",  in ad7768_probe()
596 					  indio_dev->name, indio_dev->id);  in ad7768_probe()
597 	if (!st->trig)  in ad7768_probe()
598 		return -ENOMEM;  in ad7768_probe()
600 	st->trig->ops = &ad7768_trigger_ops;  in ad7768_probe()
601 	st->trig->dev.parent = &spi->dev;  in ad7768_probe()
602 	iio_trigger_set_drvdata(st->trig, indio_dev);  in ad7768_probe()
603 	ret = devm_iio_trigger_register(&spi->dev, st->trig);  in ad7768_probe()
607 	indio_dev->trig = iio_trigger_get(st->trig);  in ad7768_probe()
609 	init_completion(&st->completion);  in ad7768_probe()
611 	ret = devm_request_irq(&spi->dev, spi->irq,  in ad7768_probe()
614 			       indio_dev->name, indio_dev);  in ad7768_probe()
618 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,  in ad7768_probe()
625 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad7768_probe()
629 	{ "ad7768-1", 0 },
635 	{ .compatible = "adi,ad7768-1" },
642 		.name = "ad7768-1",
651 MODULE_DESCRIPTION("Analog Devices AD7768-1 ADC driver");