1 // SPDX-License-Identifier: GPL-2.0+
3  * ti-adc161s626.c - Texas Instruments ADC161S626 1-channel differential ADC
5  * ADC Devices Supported:
6  *  adc141s626 - 14-bit ADC
7  *  adc161s626 - 16-bit ADC
9  * Copyright (C) 2016-2018
25 #define TI_ADC_DRV_NAME	"ti-adc161s626"
78 				   struct iio_chan_spec const *chan, int *val)  in ti_adc_read_measurement()  argument
82 	switch (data->read_size) {  in ti_adc_read_measurement()
86 		ret = spi_read(data->spi, (void *) &buf, 2);  in ti_adc_read_measurement()
96 		ret = spi_read(data->spi, (void *) &buf, 3);  in ti_adc_read_measurement()
104 		return -EINVAL;  in ti_adc_read_measurement()
107 	*val = sign_extend32(*val >> data->shift, chan->scan_type.realbits - 1);  in ti_adc_read_measurement()
115 	struct iio_dev *indio_dev = pf->indio_dev;  in ti_adc_trigger_handler()
119 	ret = ti_adc_read_measurement(data, &indio_dev->channels[0],  in ti_adc_trigger_handler()
120 				     (int *) &data->buffer);  in ti_adc_trigger_handler()
123 					data->buffer,  in ti_adc_trigger_handler()
126 	iio_trigger_notify_done(indio_dev->trig);  in ti_adc_trigger_handler()
132 			   struct iio_chan_spec const *chan,  in ti_adc_read_raw()  argument
144 		ret = ti_adc_read_measurement(data, chan, val);  in ti_adc_read_raw()
152 		ret = regulator_get_voltage(data->ref);  in ti_adc_read_raw()
157 		*val2 = chan->scan_type.realbits;  in ti_adc_read_raw()
161 		*val = 1 << (chan->scan_type.realbits - 1);  in ti_adc_read_raw()
178 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));  in ti_adc_probe()
180 		return -ENOMEM;  in ti_adc_probe()
182 	indio_dev->info = &ti_adc_info;  in ti_adc_probe()
183 	indio_dev->name = TI_ADC_DRV_NAME;  in ti_adc_probe()
184 	indio_dev->modes = INDIO_DIRECT_MODE;  in ti_adc_probe()
188 	data->spi = spi;  in ti_adc_probe()
190 	switch (spi_get_device_id(spi)->driver_data) {  in ti_adc_probe()
192 		indio_dev->channels = ti_adc141s626_channels;  in ti_adc_probe()
193 		indio_dev->num_channels = ARRAY_SIZE(ti_adc141s626_channels);  in ti_adc_probe()
194 		data->shift = 0;  in ti_adc_probe()
195 		data->read_size = 2;  in ti_adc_probe()
198 		indio_dev->channels = ti_adc161s626_channels;  in ti_adc_probe()
199 		indio_dev->num_channels = ARRAY_SIZE(ti_adc161s626_channels);  in ti_adc_probe()
200 		data->shift = 6;  in ti_adc_probe()
201 		data->read_size = 3;  in ti_adc_probe()
205 	data->ref = devm_regulator_get(&spi->dev, "vdda");  in ti_adc_probe()
206 	if (!IS_ERR(data->ref)) {  in ti_adc_probe()
207 		ret = regulator_enable(data->ref);  in ti_adc_probe()
227 	regulator_disable(data->ref);  in ti_adc_probe()
239 	regulator_disable(data->ref);  in ti_adc_remove()
270 MODULE_DESCRIPTION("Texas Instruments ADC1x1S 1-channel differential ADC");