1 // SPDX-License-Identifier: GPL-2.0
3  * IIO driver for Maxim MAX34409/34408 ADC, 4-Channels/2-Channels, 8bits, I2C
5 …* Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409…
66  * struct max34408_data - max34408/max34409 specific data.
68  * @dev:	max34408 device.
116 static int max34408_read_adc_avg(struct max34408_data *max34408,  in max34408_read_adc_avg()  argument
122 	guard(mutex)(&max34408->lock);  in max34408_read_adc_avg()
123 	rc = regmap_read(max34408->regmap, MAX34408_CONTROL_REG, (u32 *)&ctrl);  in max34408_read_adc_avg()
128 	rc = regmap_write(max34408->regmap, MAX34408_CONTROL_REG,  in max34408_read_adc_avg()
131 		dev_err(max34408->dev,  in max34408_read_adc_avg()
136 	rc = regmap_read(max34408->regmap, chan->address, val);  in max34408_read_adc_avg()
141 	rc = regmap_write(max34408->regmap, MAX34408_CONTROL_REG, ctrl);  in max34408_read_adc_avg()
143 		dev_err(max34408->dev,  in max34408_read_adc_avg()
153 	struct max34408_data *max34408 = iio_priv(indio_dev);  in max34408_read_raw()  local
158 		rc = max34408_read_adc_avg(max34408, chan, val);  in max34408_read_raw()
167 		 * (max current * adc val * 1000) / (2^8 - 1) mA  in max34408_read_raw()
169 		*val = 10000 / max34408->input_rsense[chan->channel];  in max34408_read_raw()
173 		return -EINVAL;  in max34408_read_raw()
182 	.model_name = "max34408",
188 	.model_name = "max34409",
196 	struct device *dev = &client->dev;  in max34408_probe()
197 	struct max34408_data *max34408;  in max34408_probe()  local
205 		return -EINVAL;  in max34408_probe()
214 	indio_dev = devm_iio_device_alloc(dev, sizeof(*max34408));  in max34408_probe()
216 		return -ENOMEM;  in max34408_probe()
218 	max34408 = iio_priv(indio_dev);  in max34408_probe()
219 	max34408->regmap = regmap;  in max34408_probe()
220 	max34408->dev = dev;  in max34408_probe()
221 	mutex_init(&max34408->lock);  in max34408_probe()
224 		fwnode_property_read_u32(node, "maxim,rsense-val-micro-ohms",  in max34408_probe()
225 					 &max34408->input_rsense[i]);  in max34408_probe()
230 	rc = regmap_write(max34408->regmap, MAX34408_CONTROL_REG, 0x0);  in max34408_probe()
234 	indio_dev->channels = model_data->channels;  in max34408_probe()
235 	indio_dev->num_channels = model_data->num_channels;  in max34408_probe()
236 	indio_dev->name = model_data->model_name;  in max34408_probe()
238 	indio_dev->info = &max34408_info;  in max34408_probe()
239 	indio_dev->modes = INDIO_DIRECT_MODE;  in max34408_probe()
246 		.compatible = "maxim,max34408",
250 		.compatible = "maxim,max34409",
258 	{ "max34408", (kernel_ulong_t)&max34408_model_data },
259 	{ "max34409", (kernel_ulong_t)&max34409_model_data },
266 		.name   = "max34408",
275 MODULE_DESCRIPTION("Maxim MAX34408/34409 ADC driver");