3  * IIO DAC emulation driver using a digital potentiometer
24  *                   |    '---'       dac output voltage
56 	struct dpot_dac *dac = iio_priv(indio_dev);  in dpot_dac_read_raw()  local
62 		return iio_read_channel_raw(dac->dpot, val);  in dpot_dac_read_raw()
65 		ret = iio_read_channel_scale(dac->dpot, val, val2);  in dpot_dac_read_raw()
69 			do_div(tmp, dac->max_ohms);  in dpot_dac_read_raw()
70 			tmp *= regulator_get_voltage(dac->vref) / 1000;  in dpot_dac_read_raw()
84 			*val *= regulator_get_voltage(dac->vref) / 1000;  in dpot_dac_read_raw()
85 			*val2 *= dac->max_ohms;  in dpot_dac_read_raw()
100 	struct dpot_dac *dac = iio_priv(indio_dev);  in dpot_dac_read_avail()  local
105 		return iio_read_avail_channel_raw(dac->dpot, vals, length);  in dpot_dac_read_avail()
115 	struct dpot_dac *dac = iio_priv(indio_dev);  in dpot_dac_write_raw()  local
119 		return iio_write_channel_raw(dac->dpot, val);  in dpot_dac_write_raw()
134 	struct dpot_dac *dac = iio_priv(indio_dev);  in dpot_dac_channel_max_ohms()  local
141 	ret = iio_read_max_channel_raw(dac->dpot, &max);  in dpot_dac_channel_max_ohms()
147 	switch (iio_read_channel_scale(dac->dpot, &val, &val2)) {  in dpot_dac_channel_max_ohms()
169 	struct dpot_dac *dac;  in dpot_dac_probe()  local
173 	indio_dev = devm_iio_device_alloc(dev, sizeof(*dac));  in dpot_dac_probe()
178 	dac = iio_priv(indio_dev);  in dpot_dac_probe()
186 	dac->vref = devm_regulator_get(dev, "vref");  in dpot_dac_probe()
187 	if (IS_ERR(dac->vref))  in dpot_dac_probe()
188 		return dev_err_probe(&pdev->dev, PTR_ERR(dac->vref),  in dpot_dac_probe()
191 	dac->dpot = devm_iio_channel_get(dev, "dpot");  in dpot_dac_probe()
192 	if (IS_ERR(dac->dpot))  in dpot_dac_probe()
193 		return dev_err_probe(&pdev->dev, PTR_ERR(dac->dpot),  in dpot_dac_probe()
196 	ret = iio_get_channel_type(dac->dpot, &type);  in dpot_dac_probe()
208 	dac->max_ohms = ret;  in dpot_dac_probe()
210 	ret = regulator_enable(dac->vref);  in dpot_dac_probe()
225 	regulator_disable(dac->vref);  in dpot_dac_probe()
232 	struct dpot_dac *dac = iio_priv(indio_dev);  in dpot_dac_remove()  local
235 	regulator_disable(dac->vref);  in dpot_dac_remove()
241 	{ .compatible = "dpot-dac" },
250 		.name = "iio-dpot-dac",
256 MODULE_DESCRIPTION("DAC emulation driver using a digital potentiometer");