60 static int ad7949_spi_write_cfg(struct ad7949_adc_chip *ad7949_adc, u16 val,  in ad7949_spi_write_cfg()  argument
64 	int bits_per_word = ad7949_adc->resolution;  in ad7949_spi_write_cfg()
69 			.tx_buf = &ad7949_adc->buffer,  in ad7949_spi_write_cfg()
75 	ad7949_adc->cfg = (val & mask) | (ad7949_adc->cfg & ~mask);  in ad7949_spi_write_cfg()
76 	ad7949_adc->buffer = ad7949_adc->cfg << shift;  in ad7949_spi_write_cfg()
78 	ret = spi_sync(ad7949_adc->spi, &msg);  in ad7949_spi_write_cfg()
88 static int ad7949_spi_read_channel(struct ad7949_adc_chip *ad7949_adc, int *val,  in ad7949_spi_read_channel()  argument
93 	int bits_per_word = ad7949_adc->resolution;  in ad7949_spi_read_channel()
94 	int mask = GENMASK(ad7949_adc->resolution - 1, 0);  in ad7949_spi_read_channel()
98 			.rx_buf = &ad7949_adc->buffer,  in ad7949_spi_read_channel()
111 		ret = ad7949_spi_write_cfg(ad7949_adc,  in ad7949_spi_read_channel()
116 		if (channel == ad7949_adc->current_channel)  in ad7949_spi_read_channel()
121 	ad7949_adc->buffer = 0;  in ad7949_spi_read_channel()
123 	ret = spi_sync(ad7949_adc->spi, &msg);  in ad7949_spi_read_channel()
133 	ad7949_adc->current_channel = channel;  in ad7949_spi_read_channel()
135 	*val = ad7949_adc->buffer & mask;  in ad7949_spi_read_channel()
163 	struct ad7949_adc_chip *ad7949_adc = iio_priv(indio_dev);  in ad7949_spi_read_raw()  local
171 		mutex_lock(&ad7949_adc->lock);  in ad7949_spi_read_raw()
172 		ret = ad7949_spi_read_channel(ad7949_adc, val, chan->channel);  in ad7949_spi_read_raw()
173 		mutex_unlock(&ad7949_adc->lock);  in ad7949_spi_read_raw()
181 		ret = regulator_get_voltage(ad7949_adc->vref);  in ad7949_spi_read_raw()
196 	struct ad7949_adc_chip *ad7949_adc = iio_priv(indio_dev);  in ad7949_spi_reg_access()  local
200 		*readval = ad7949_adc->cfg;  in ad7949_spi_reg_access()
202 		ret = ad7949_spi_write_cfg(ad7949_adc,  in ad7949_spi_reg_access()
213 static int ad7949_spi_init(struct ad7949_adc_chip *ad7949_adc)  in ad7949_spi_init()  argument
219 	ad7949_adc->current_channel = 0;  in ad7949_spi_init()
220 	ret = ad7949_spi_write_cfg(ad7949_adc, 0x3C79, AD7949_MASK_TOTAL);  in ad7949_spi_init()
226 	ad7949_spi_read_channel(ad7949_adc, &val, ad7949_adc->current_channel);  in ad7949_spi_init()
227 	ad7949_spi_read_channel(ad7949_adc, &val, ad7949_adc->current_channel);  in ad7949_spi_init()
236 	struct ad7949_adc_chip *ad7949_adc;  in ad7949_spi_probe()  local
240 	indio_dev = devm_iio_device_alloc(dev, sizeof(*ad7949_adc));  in ad7949_spi_probe()
252 	ad7949_adc = iio_priv(indio_dev);  in ad7949_spi_probe()
253 	ad7949_adc->indio_dev = indio_dev;  in ad7949_spi_probe()
254 	ad7949_adc->spi = spi;  in ad7949_spi_probe()
258 	ad7949_adc->resolution = spec->resolution;  in ad7949_spi_probe()
260 	ad7949_adc->vref = devm_regulator_get(dev, "vref");  in ad7949_spi_probe()
261 	if (IS_ERR(ad7949_adc->vref)) {  in ad7949_spi_probe()
263 		return PTR_ERR(ad7949_adc->vref);  in ad7949_spi_probe()
266 	ret = regulator_enable(ad7949_adc->vref);  in ad7949_spi_probe()
272 	mutex_init(&ad7949_adc->lock);  in ad7949_spi_probe()
274 	ret = ad7949_spi_init(ad7949_adc);  in ad7949_spi_probe()
289 	mutex_destroy(&ad7949_adc->lock);  in ad7949_spi_probe()
290 	regulator_disable(ad7949_adc->vref);  in ad7949_spi_probe()
298 	struct ad7949_adc_chip *ad7949_adc = iio_priv(indio_dev);  in ad7949_spi_remove()  local
301 	mutex_destroy(&ad7949_adc->lock);  in ad7949_spi_remove()
302 	regulator_disable(ad7949_adc->vref);  in ad7949_spi_remove()