1 // SPDX-License-Identifier: GPL-2.0-only
44  * enum ads8688_range - ADS8688 reference voltage range
45  * @ADS8688_PLUSMINUS25VREF: Device is configured for input range ±2.5 * VREF
46  * @ADS8688_PLUSMINUS125VREF: Device is configured for input range ±1.25 * VREF
47  * @ADS8688_PLUSMINUS0625VREF: Device is configured for input range ±0.625 * VREF
48  * @ADS8688_PLUS25VREF: Device is configured for input range 0 - 2.5 * VREF
49  * @ADS8688_PLUS125VREF: Device is configured for input range 0 - 1.25 * VREF
92 		.offset = -(1 << (ADS8688_REALBITS - 1)),
97 		.offset = -(1 << (ADS8688_REALBITS - 1)),
102 		.offset = -(1 << (ADS8688_REALBITS - 1)),
123 		       ads8688_range_def[0].scale * st->vref_mv,  in ads8688_show_scales()
124 		       ads8688_range_def[1].scale * st->vref_mv,  in ads8688_show_scales()
125 		       ads8688_range_def[2].scale * st->vref_mv);  in ads8688_show_scales()
193 	st->data[0].d32 = cpu_to_be32(tmp);  in ads8688_prog_write()
195 	return spi_write(st->spi, &st->data[0].d8[1], 3);  in ads8688_prog_write()
205 	st->data[0].d32 = cpu_to_be32(tmp);  in ads8688_reset()
207 	return spi_write(st->spi, &st->data[0].d8[0], 4);  in ads8688_reset()
217 			.tx_buf = &st->data[0].d8[0],  in ads8688_read()
221 			.tx_buf = &st->data[1].d8[0],  in ads8688_read()
222 			.rx_buf = &st->data[1].d8[0],  in ads8688_read()
229 	st->data[0].d32 = cpu_to_be32(tmp);  in ads8688_read()
233 	st->data[1].d32 = cpu_to_be32(tmp);  in ads8688_read()
235 	ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));  in ads8688_read()
239 	return be32_to_cpu(st->data[1].d32) & 0xffff;  in ads8688_read()
251 	mutex_lock(&st->lock);  in ads8688_read_raw()
254 		ret = ads8688_read(indio_dev, chan->channel);  in ads8688_read_raw()
255 		mutex_unlock(&st->lock);  in ads8688_read_raw()
261 		scale_mv = st->vref_mv;  in ads8688_read_raw()
262 		scale_mv *= ads8688_range_def[st->range[chan->channel]].scale;  in ads8688_read_raw()
265 		mutex_unlock(&st->lock);  in ads8688_read_raw()
268 		offset = ads8688_range_def[st->range[chan->channel]].offset;  in ads8688_read_raw()
270 		mutex_unlock(&st->lock);  in ads8688_read_raw()
273 	mutex_unlock(&st->lock);  in ads8688_read_raw()
275 	return -EINVAL;  in ads8688_read_raw()
284 	tmp = ADS8688_PROG_REG_RANGE_CH(chan->channel);  in ads8688_write_reg_range()
295 	int ret = -EINVAL, i, offset = 0;  in ads8688_write_raw()
297 	mutex_lock(&st->lock);  in ads8688_write_raw()
300 		/* If the offset is 0 the ±2.5 * VREF mode is not available */  in ads8688_write_raw()
301 		offset = ads8688_range_def[st->range[chan->channel]].offset;  in ads8688_write_raw()
302 		if (offset == 0 && val2 == ads8688_range_def[0].scale * st->vref_mv) {  in ads8688_write_raw()
303 			mutex_unlock(&st->lock);  in ads8688_write_raw()
304 			return -EINVAL;  in ads8688_write_raw()
309 			if (val2 == ads8688_range_def[i].scale * st->vref_mv &&  in ads8688_write_raw()
319 		 * 0 and -(1 << (ADS8688_REALBITS - 1))  in ads8688_write_raw()
323 			mutex_unlock(&st->lock);  in ads8688_write_raw()
324 			return -EINVAL;  in ads8688_write_raw()
328 		 * If the device are in ±2.5 * VREF mode, it's not allowed to  in ads8688_write_raw()
332 		    st->range[chan->channel] == ADS8688_PLUSMINUS25VREF) {  in ads8688_write_raw()
333 			mutex_unlock(&st->lock);  in ads8688_write_raw()
334 			return -EINVAL;  in ads8688_write_raw()
337 		scale = ads8688_range_def[st->range[chan->channel]].scale;  in ads8688_write_raw()
351 		st->range[chan->channel] = ads8688_range_def[i].range;  in ads8688_write_raw()
353 	mutex_unlock(&st->lock);  in ads8688_write_raw()
369 	return -EINVAL;  in ads8688_write_raw_get_fmt()
379 static irqreturn_t ads8688_trigger_handler(int irq, void *p)  in ads8688_trigger_handler()  argument
381 	struct iio_poll_func *pf = p;  in ads8688_trigger_handler()
382 	struct iio_dev *indio_dev = pf->indio_dev;  in ads8688_trigger_handler()
395 	iio_trigger_notify_done(indio_dev->trig);  in ads8688_trigger_handler()
417 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ads8688_probe()
419 		return -ENOMEM;  in ads8688_probe()
423 	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");  in ads8688_probe()
424 	if (ret < 0 && ret != -ENODEV)  in ads8688_probe()
427 	st->vref_mv = ret == -ENODEV ? ADS8688_VREF_MV : ret / 1000;  in ads8688_probe()
429 	st->chip_info =	&ads8688_chip_info_tbl[spi_get_device_id(spi)->driver_data];  in ads8688_probe()
431 	spi->mode = SPI_MODE_1;  in ads8688_probe()
433 	st->spi = spi;  in ads8688_probe()
435 	indio_dev->name = spi_get_device_id(spi)->name;  in ads8688_probe()
436 	indio_dev->modes = INDIO_DIRECT_MODE;  in ads8688_probe()
437 	indio_dev->channels = st->chip_info->channels;  in ads8688_probe()
438 	indio_dev->num_channels = st->chip_info->num_channels;  in ads8688_probe()
439 	indio_dev->info = &ads8688_info;  in ads8688_probe()
443 	mutex_init(&st->lock);  in ads8688_probe()
445 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, NULL,  in ads8688_probe()
448 		return dev_err_probe(&spi->dev, ret,  in ads8688_probe()
451 	return devm_iio_device_register(&spi->dev, indio_dev);  in ads8688_probe()