1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright 2023-2024 Analog Devices Inc.
21 #include <linux/spi/spi.h>
141 	struct spi_device *spi;  member
177 		.tx_buf = st->reg_tx_buf,  in ad7779_spi_read()
178 		.rx_buf = st->reg_rx_buf,  in ad7779_spi_read()
181 	st->reg_tx_buf[0] = AD7779_SPI_READ_CMD | FIELD_GET(AD7779_REG_MSK, reg);  in ad7779_spi_read()
182 	st->reg_tx_buf[1] = 0;  in ad7779_spi_read()
188 		st->reg_tx_buf[2] = crc8(ad7779_crc8_table, st->reg_tx_buf,  in ad7779_spi_read()
189 					 t.len - 1, 0);  in ad7779_spi_read()
192 	ret = spi_sync_transfer(st->spi, &t, 1);  in ad7779_spi_read()
197 	crc_buf[1] = st->reg_rx_buf[1];  in ad7779_spi_read()
199 	if (reg != AD7779_REG_GEN_ERR_REG_1_EN && exp_crc != st->reg_rx_buf[2]) {  in ad7779_spi_read()
200 		dev_err(&st->spi->dev, "Bad CRC %x, expected %x",  in ad7779_spi_read()
201 			st->reg_rx_buf[2], exp_crc);  in ad7779_spi_read()
202 		return -EINVAL;  in ad7779_spi_read()
204 	*rbuf = st->reg_rx_buf[1];  in ad7779_spi_read()
213 	st->reg_tx_buf[0] = FIELD_GET(AD7779_REG_MSK, reg);  in ad7779_spi_write()
214 	st->reg_tx_buf[1] = val;  in ad7779_spi_write()
218 		st->reg_tx_buf[2] = crc8(ad7779_crc8_table, st->reg_tx_buf,  in ad7779_spi_write()
219 					 length - 1, 0);  in ad7779_spi_write()
221 	return spi_write(st->spi, st->reg_tx_buf, length);  in ad7779_spi_write()
224 static int ad7779_spi_write_mask(struct ad7779_state *st, u8 reg, u8 mask,  in ad7779_spi_write_mask()  argument
234 	regval = (data & ~mask) | (val & mask);  in ad7779_spi_write_mask()
270 	if (st->filter_enabled == AD7779_SINC3 &&  in ad7779_set_sampling_frequency()
272 		return -EINVAL;  in ad7779_set_sampling_frequency()
274 	if (st->filter_enabled == AD7779_SINC5 &&  in ad7779_set_sampling_frequency()
276 		return -EINVAL;  in ad7779_set_sampling_frequency()
279 		return -EINVAL;  in ad7779_set_sampling_frequency()
303 		decimal = ((mult_frac(div, KILO, freq_khz) - dec * KILO) << 16)  in ad7779_set_sampling_frequency()
337 	st->sampling_freq = sampling_freq;  in ad7779_set_sampling_frequency()
370 	ret = ad7779_set_sampling_frequency(st, st->sampling_freq);  in ad7779_set_filter()
374 	st->filter_enabled = mode;  in ad7779_set_filter()
472 			   int *val2, long mask)  in ad7779_read_raw()  argument
477 	iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {  in ad7779_read_raw()
478 		switch (mask) {  in ad7779_read_raw()
480 			ret = ad7779_get_calibscale(st, chan->channel);  in ad7779_read_raw()
487 			ret = ad7779_get_calibbias(st, chan->channel);  in ad7779_read_raw()
493 			*val = st->sampling_freq;  in ad7779_read_raw()
495 				return -EINVAL;  in ad7779_read_raw()
498 			return -EINVAL;  in ad7779_read_raw()
506 			    long mask)  in ad7779_write_raw()  argument
510 	iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {  in ad7779_write_raw()
511 		switch (mask) {  in ad7779_write_raw()
513 			return ad7779_set_calibscale(st, chan->channel, val2);  in ad7779_write_raw()
515 			return ad7779_set_calibbias(st, chan->channel, val);  in ad7779_write_raw()
519 			return -EINVAL;  in ad7779_write_raw()
538 	 * DRDY output cannot be disabled at device level therefore we mask  in ad7779_buffer_preenable()
541 	enable_irq(st->spi->irq);  in ad7779_buffer_preenable()
550 	disable_irq(st->spi->irq);  in ad7779_buffer_postdisable()
559 	struct iio_dev *indio_dev = pf->indio_dev;  in ad7779_trigger_handler()
563 		.rx_buf = st->data.chans,  in ad7779_trigger_handler()
564 		.tx_buf = st->spidata_tx,  in ad7779_trigger_handler()
568 	st->spidata_tx[0] = AD7779_SPI_READ_CMD;  in ad7779_trigger_handler()
569 	ret = spi_sync_transfer(st->spi, &t, 1);  in ad7779_trigger_handler()
571 		dev_err(&st->spi->dev, "SPI transfer error in IRQ handler");  in ad7779_trigger_handler()
575 	iio_push_to_buffers_with_timestamp(indio_dev, &st->data, pf->timestamp);  in ad7779_trigger_handler()
578 	iio_trigger_notify_done(indio_dev->trig);  in ad7779_trigger_handler()
587 		.tx_buf = st->reset_buf,  in ad7779_reset()
597 		memset(st->reset_buf, 0xff, sizeof(st->reset_buf));  in ad7779_reset()
598 		ret = spi_sync_transfer(st->spi, &t, 1);  in ad7779_reset()
731 static int ad7779_probe(struct spi_device *spi)  in ad7779_probe()  argument
736 	struct device *dev = &spi->dev;  in ad7779_probe()
737 	int ret = -EINVAL;  in ad7779_probe()
739 	if (!spi->irq)  in ad7779_probe()
740 		return dev_err_probe(dev, ret, "DRDY irq not present\n");  in ad7779_probe()
744 		return -ENOMEM;  in ad7779_probe()
755 	st->mclk = devm_clk_get_enabled(dev, "mclk");  in ad7779_probe()
756 	if (IS_ERR(st->mclk))  in ad7779_probe()
757 		return PTR_ERR(st->mclk);  in ad7779_probe()
768 	st->spi = spi;  in ad7779_probe()
770 	st->chip_info = spi_get_device_match_data(spi);  in ad7779_probe()
771 	if (!st->chip_info)  in ad7779_probe()
772 		return -ENODEV;  in ad7779_probe()
782 	indio_dev->name = st->chip_info->name;  in ad7779_probe()
783 	indio_dev->info = &ad7779_info;  in ad7779_probe()
784 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad7779_probe()
785 	indio_dev->channels = st->chip_info->channels;  in ad7779_probe()
786 	indio_dev->num_channels = ARRAY_SIZE(ad7779_channels);  in ad7779_probe()
788 	st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name,  in ad7779_probe()
790 	if (!st->trig)  in ad7779_probe()
791 		return -ENOMEM;  in ad7779_probe()
793 	st->trig->ops = &ad7779_trigger_ops;  in ad7779_probe()
795 	iio_trigger_set_drvdata(st->trig, st);  in ad7779_probe()
797 	ret = devm_request_irq(dev, spi->irq, iio_trigger_generic_data_rdy_poll,  in ad7779_probe()
798 			       IRQF_ONESHOT | IRQF_NO_AUTOEN, indio_dev->name,  in ad7779_probe()
799 			       st->trig);  in ad7779_probe()
802 				     st->spi->irq);  in ad7779_probe()
804 	ret = devm_iio_trigger_register(dev, st->trig);  in ad7779_probe()
808 	indio_dev->trig = iio_trigger_get(st->trig);  in ad7779_probe()
810 	init_completion(&st->completion);  in ad7779_probe()
882 MODULE_DEVICE_TABLE(spi, ad7779_id);