1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright 2010-2011 Analog Devices Inc.
28 #define AD7887_REF_DIS		BIT(5)	/* on-chip reference disable */
29 #define AD7887_DUAL		BIT(4)	/* dual-channel mode */
30 #define AD7887_CH_AIN1		BIT(3)	/* convert on channel 1, DUAL=1 */
31 #define AD7887_CH_AIN0		0	/* convert on channel 0, DUAL=0,1 */
44  * struct ad7887_chip_info - chip specifc information
46  * @channels:		channels specification
47  * @num_channels:	number of channels
48  * @dual_channels:	channels specification in dual mode
49  * @num_dual_channels:	number of channels in dual mode
53 	const struct iio_chan_spec	*channels;  member
87 	switch (*indio_dev->active_scan_mask) {  in ad7887_ring_preenable()
89 		st->ring_msg = &st->msg[AD7887_CH0];  in ad7887_ring_preenable()
92 		st->ring_msg = &st->msg[AD7887_CH1];  in ad7887_ring_preenable()
94 		spi_sync(st->spi, st->ring_msg);  in ad7887_ring_preenable()
97 		st->ring_msg = &st->msg[AD7887_CH0_CH1];  in ad7887_ring_preenable()
109 	return spi_sync(st->spi, &st->msg[AD7887_CH0]);  in ad7887_ring_postdisable()
121 	struct iio_dev *indio_dev = pf->indio_dev;  in ad7887_trigger_handler()
125 	b_sent = spi_sync(st->spi, st->ring_msg);  in ad7887_trigger_handler()
129 	iio_push_to_buffers_with_timestamp(indio_dev, st->data,  in ad7887_trigger_handler()
132 	iio_trigger_notify_done(indio_dev->trig);  in ad7887_trigger_handler()
144 	int ret = spi_sync(st->spi, &st->msg[ch]);  in ad7887_scan_direct()
148 	return (st->data[(ch * 2)] << 8) | st->data[(ch * 2) + 1];  in ad7887_scan_direct()
165 		ret = ad7887_scan_direct(st, chan->address);  in ad7887_read_raw()
170 		*val = ret >> chan->scan_type.shift;  in ad7887_read_raw()
171 		*val &= GENMASK(chan->scan_type.realbits - 1, 0);  in ad7887_read_raw()
174 		if (st->reg) {  in ad7887_read_raw()
175 			*val = regulator_get_voltage(st->reg);  in ad7887_read_raw()
180 			*val = st->chip_info->int_vref_mv;  in ad7887_read_raw()
183 		*val2 = chan->scan_type.realbits;  in ad7887_read_raw()
187 	return -EINVAL;  in ad7887_read_raw()
223 		.channels = ad7887_channels,
237 	struct ad7887_platform_data *pdata = spi->dev.platform_data;  in ad7887_probe()
243 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7887_probe()
245 		return -ENOMEM;  in ad7887_probe()
249 	if (!pdata || !pdata->use_onchip_ref) {  in ad7887_probe()
250 		st->reg = devm_regulator_get(&spi->dev, "vref");  in ad7887_probe()
251 		if (IS_ERR(st->reg))  in ad7887_probe()
252 			return PTR_ERR(st->reg);  in ad7887_probe()
254 		ret = regulator_enable(st->reg);  in ad7887_probe()
259 	st->chip_info =  in ad7887_probe()
260 		&ad7887_chip_info_tbl[spi_get_device_id(spi)->driver_data];  in ad7887_probe()
263 	st->spi = spi;  in ad7887_probe()
265 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7887_probe()
266 	indio_dev->info = &ad7887_info;  in ad7887_probe()
267 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad7887_probe()
272 	if (!pdata || !pdata->use_onchip_ref)  in ad7887_probe()
274 	if (pdata && pdata->en_dual)  in ad7887_probe()
277 	st->tx_cmd_buf[0] = AD7887_CH_AIN0 | mode;  in ad7887_probe()
279 	st->xfer[0].rx_buf = &st->data[0];  in ad7887_probe()
280 	st->xfer[0].tx_buf = &st->tx_cmd_buf[0];  in ad7887_probe()
281 	st->xfer[0].len = 2;  in ad7887_probe()
283 	spi_message_init(&st->msg[AD7887_CH0]);  in ad7887_probe()
284 	spi_message_add_tail(&st->xfer[0], &st->msg[AD7887_CH0]);  in ad7887_probe()
286 	if (pdata && pdata->en_dual) {  in ad7887_probe()
287 		st->tx_cmd_buf[2] = AD7887_CH_AIN1 | mode;  in ad7887_probe()
289 		st->xfer[1].rx_buf = &st->data[0];  in ad7887_probe()
290 		st->xfer[1].tx_buf = &st->tx_cmd_buf[2];  in ad7887_probe()
291 		st->xfer[1].len = 2;  in ad7887_probe()
293 		st->xfer[2].rx_buf = &st->data[2];  in ad7887_probe()
294 		st->xfer[2].tx_buf = &st->tx_cmd_buf[0];  in ad7887_probe()
295 		st->xfer[2].len = 2;  in ad7887_probe()
297 		spi_message_init(&st->msg[AD7887_CH0_CH1]);  in ad7887_probe()
298 		spi_message_add_tail(&st->xfer[1], &st->msg[AD7887_CH0_CH1]);  in ad7887_probe()
299 		spi_message_add_tail(&st->xfer[2], &st->msg[AD7887_CH0_CH1]);  in ad7887_probe()
301 		st->xfer[3].rx_buf = &st->data[2];  in ad7887_probe()
302 		st->xfer[3].tx_buf = &st->tx_cmd_buf[2];  in ad7887_probe()
303 		st->xfer[3].len = 2;  in ad7887_probe()
305 		spi_message_init(&st->msg[AD7887_CH1]);  in ad7887_probe()
306 		spi_message_add_tail(&st->xfer[3], &st->msg[AD7887_CH1]);  in ad7887_probe()
308 		indio_dev->channels = st->chip_info->dual_channels;  in ad7887_probe()
309 		indio_dev->num_channels = st->chip_info->num_dual_channels;  in ad7887_probe()
311 		indio_dev->channels = st->chip_info->channels;  in ad7887_probe()
312 		indio_dev->num_channels = st->chip_info->num_channels;  in ad7887_probe()
328 	if (st->reg)  in ad7887_probe()
329 		regulator_disable(st->reg);  in ad7887_probe()
341 	if (st->reg)  in ad7887_remove()
342 		regulator_disable(st->reg);  in ad7887_remove()