2  * MAX1117/MAX1118/MAX1119 8-bit, dual-channel ADCs driver
10  * Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX1117-MAX1119.pdf
16  * ------  ---------  -----------
17  * nCS        -->     CNVST
18  * SCK        -->     SCLK
19  * MISO       <--     DOUT
20  * ------  ---------  -----------
78 		 * and low for a second time.  in max1118_read()
82 			.delay_usecs = 1,	/* > CNVST Low Time 100 ns */  in max1118_read()
86 		 * The acquisition interval begins with the falling edge of  in max1118_read()
87 		 * CNVST.  The total acquisition and conversion process takes  in max1118_read()
95 			.rx_buf = &adc->data,  in max1118_read()
109 	return adc->data;  in max1118_read()
119 	switch (id->driver_data) {  in max1118_get_vref_mV()
125 		vref_uV = regulator_get_voltage(adc->reg);  in max1118_get_vref_mV()
131 	return -ENODEV;  in max1118_get_vref_mV()
142 		mutex_lock(&adc->lock);  in max1118_read_raw()
143 		*val = max1118_read(adc->spi, chan->channel);  in max1118_read_raw()
144 		mutex_unlock(&adc->lock);  in max1118_read_raw()
150 		*val = max1118_get_vref_mV(adc->spi);  in max1118_read_raw()
158 	return -EINVAL;  in max1118_read_raw()
168 	struct iio_dev *indio_dev = pf->indio_dev;  in max1118_trigger_handler()
173 	mutex_lock(&adc->lock);  in max1118_trigger_handler()
175 	for_each_set_bit(scan_index, indio_dev->active_scan_mask,  in max1118_trigger_handler()
176 			indio_dev->masklength) {  in max1118_trigger_handler()
178 				&indio_dev->channels[scan_index];  in max1118_trigger_handler()
179 		int ret = max1118_read(adc->spi, scan_chan->channel);  in max1118_trigger_handler()
182 			dev_warn(&adc->spi->dev,  in max1118_trigger_handler()
187 		adc->scan.channels[i] = ret;  in max1118_trigger_handler()
190 	iio_push_to_buffers_with_timestamp(indio_dev, &adc->scan,  in max1118_trigger_handler()
193 	mutex_unlock(&adc->lock);  in max1118_trigger_handler()
195 	iio_trigger_notify_done(indio_dev->trig);  in max1118_trigger_handler()
207 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));  in max1118_probe()
209 		return -ENOMEM;  in max1118_probe()
212 	adc->spi = spi;  in max1118_probe()
213 	mutex_init(&adc->lock);  in max1118_probe()
215 	if (id->driver_data == max1118) {  in max1118_probe()
216 		adc->reg = devm_regulator_get(&spi->dev, "vref");  in max1118_probe()
217 		if (IS_ERR(adc->reg)) {  in max1118_probe()
218 			dev_err(&spi->dev, "failed to get vref regulator\n");  in max1118_probe()
219 			return PTR_ERR(adc->reg);  in max1118_probe()
221 		ret = regulator_enable(adc->reg);  in max1118_probe()
228 	indio_dev->name = spi_get_device_id(spi)->name;  in max1118_probe()
229 	indio_dev->dev.parent = &spi->dev;  in max1118_probe()
230 	indio_dev->info = &max1118_info;  in max1118_probe()
231 	indio_dev->modes = INDIO_DIRECT_MODE;  in max1118_probe()
232 	indio_dev->channels = max1118_channels;  in max1118_probe()
233 	indio_dev->num_channels = ARRAY_SIZE(max1118_channels);  in max1118_probe()
257 	if (id->driver_data == max1118)  in max1118_probe()
258 		regulator_disable(adc->reg);  in max1118_probe()
271 	if (id->driver_data == max1118)  in max1118_remove()
272 		return regulator_disable(adc->reg);  in max1118_remove()