1 // SPDX-License-Identifier: GPL-2.0
47 		if (rescale->chan_processed)  in rescale_read_raw()
53 			return iio_read_channel_processed(rescale->source, val);  in rescale_read_raw()
55 			return iio_read_channel_raw(rescale->source, val);  in rescale_read_raw()
58 		if (rescale->chan_processed) {  in rescale_read_raw()
60 			 * Processed channels are scaled 1-to-1  in rescale_read_raw()
66 			ret = iio_read_channel_scale(rescale->source, val, val2);  in rescale_read_raw()
70 			*val *= rescale->numerator;  in rescale_read_raw()
71 			*val2 *= rescale->denominator;  in rescale_read_raw()
74 			*val *= rescale->numerator;  in rescale_read_raw()
75 			if (rescale->denominator == 1)  in rescale_read_raw()
77 			*val2 = rescale->denominator;  in rescale_read_raw()
81 			do_div(tmp, rescale->denominator);  in rescale_read_raw()
82 			tmp *= rescale->numerator;  in rescale_read_raw()
87 			return -EOPNOTSUPP;  in rescale_read_raw()
90 		return -EINVAL;  in rescale_read_raw()
104 		return iio_read_avail_channel_raw(rescale->source,  in rescale_read_avail()
107 		return -EINVAL;  in rescale_read_avail()
123 	return iio_read_channel_ext_info(rescale->source,  in rescale_read_ext_info()
124 					 rescale->ext_info[private].name,  in rescale_read_ext_info()
135 	return iio_write_channel_ext_info(rescale->source,  in rescale_write_ext_info()
136 					  rescale->ext_info[private].name,  in rescale_write_ext_info()
143 	struct iio_chan_spec *chan = &rescale->chan;  in rescale_configure_channel()
144 	struct iio_chan_spec const *schan = rescale->source->channel;  in rescale_configure_channel()
146 	chan->indexed = 1;  in rescale_configure_channel()
147 	chan->output = schan->output;  in rescale_configure_channel()
148 	chan->ext_info = rescale->ext_info;  in rescale_configure_channel()
149 	chan->type = rescale->cfg->type;  in rescale_configure_channel()
156 		rescale->chan_processed = true;  in rescale_configure_channel()
159 		return -EINVAL;  in rescale_configure_channel()
162 	chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |  in rescale_configure_channel()
171 	    !rescale->chan_processed)  in rescale_configure_channel()
172 		chan->info_mask_separate_available |= BIT(IIO_CHAN_INFO_RAW);  in rescale_configure_channel()
186 	ret = device_property_read_u32(dev, "sense-resistor-micro-ohms",  in rescale_current_sense_amplifier_props()
193 	device_property_read_u32(dev, "sense-gain-mult", &gain_mult);  in rescale_current_sense_amplifier_props()
194 	device_property_read_u32(dev, "sense-gain-div", &gain_div);  in rescale_current_sense_amplifier_props()
202 	rescale->numerator = 1000000 / factor;  in rescale_current_sense_amplifier_props()
203 	rescale->denominator = sense / factor;  in rescale_current_sense_amplifier_props()
205 	factor = gcd(rescale->numerator, gain_mult);  in rescale_current_sense_amplifier_props()
206 	rescale->numerator /= factor;  in rescale_current_sense_amplifier_props()
207 	rescale->denominator *= gain_mult / factor;  in rescale_current_sense_amplifier_props()
209 	factor = gcd(rescale->denominator, gain_div);  in rescale_current_sense_amplifier_props()
210 	rescale->numerator *= gain_div / factor;  in rescale_current_sense_amplifier_props()
211 	rescale->denominator /= factor;  in rescale_current_sense_amplifier_props()
223 	ret = device_property_read_u32(dev, "shunt-resistor-micro-ohms",  in rescale_current_sense_shunt_props()
231 	rescale->numerator = 1000000 / factor;  in rescale_current_sense_shunt_props()
232 	rescale->denominator = shunt / factor;  in rescale_current_sense_shunt_props()
243 	ret = device_property_read_u32(dev, "output-ohms",  in rescale_voltage_divider_props()
244 				       &rescale->denominator);  in rescale_voltage_divider_props()
246 		dev_err(dev, "failed to read output-ohms: %d\n", ret);  in rescale_voltage_divider_props()
250 	ret = device_property_read_u32(dev, "full-ohms",  in rescale_voltage_divider_props()
251 				       &rescale->numerator);  in rescale_voltage_divider_props()
253 		dev_err(dev, "failed to read full-ohms: %d\n", ret);  in rescale_voltage_divider_props()
257 	factor = gcd(rescale->numerator, rescale->denominator);  in rescale_voltage_divider_props()
258 	rescale->numerator /= factor;  in rescale_voltage_divider_props()
259 	rescale->denominator /= factor;  in rescale_voltage_divider_props()
286 	{ .compatible = "current-sense-amplifier",
288 	{ .compatible = "current-sense-shunt",
290 	{ .compatible = "voltage-divider",
298 	struct device *dev = &pdev->dev;  in rescale_probe()
315 		sizeof_ext_info *= sizeof(*rescale->ext_info);  in rescale_probe()
322 		return -ENOMEM;  in rescale_probe()
326 	rescale->cfg = of_device_get_match_data(dev);  in rescale_probe()
327 	rescale->numerator = 1;  in rescale_probe()
328 	rescale->denominator = 1;  in rescale_probe()
330 	ret = rescale->cfg->props(dev, rescale);  in rescale_probe()
334 	if (!rescale->numerator || !rescale->denominator) {  in rescale_probe()
336 		return -EINVAL;  in rescale_probe()
341 	rescale->source = source;  in rescale_probe()
343 	indio_dev->name = dev_name(dev);  in rescale_probe()
344 	indio_dev->info = &rescale_info;  in rescale_probe()
345 	indio_dev->modes = INDIO_DIRECT_MODE;  in rescale_probe()
346 	indio_dev->channels = &rescale->chan;  in rescale_probe()
347 	indio_dev->num_channels = 1;  in rescale_probe()
349 		rescale->ext_info = devm_kmemdup(dev,  in rescale_probe()
350 						 source->channel->ext_info,  in rescale_probe()
352 		if (!rescale->ext_info)  in rescale_probe()
353 			return -ENOMEM;  in rescale_probe()
355 		for (i = 0; rescale->ext_info[i].name; ++i) {  in rescale_probe()
357 				&rescale->ext_info[i];  in rescale_probe()
359 			if (source->channel->ext_info[i].read)  in rescale_probe()
360 				ext_info->read = rescale_read_ext_info;  in rescale_probe()
361 			if (source->channel->ext_info[i].write)  in rescale_probe()
362 				ext_info->write = rescale_write_ext_info;  in rescale_probe()
363 			ext_info->private = i;  in rescale_probe()
377 		.name = "iio-rescale",