1 // SPDX-License-Identifier: GPL-2.0-only
3  * MAX1117/MAX1118/MAX1119 8-bit, dual-channel ADCs driver
7  * Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX1117-MAX1119.pdf
13  * ------  ---------  -----------
14  * nCS        -->     CNVST
15  * SCK        -->     SCLK
16  * MISO       <--     DOUT
17  * ------  ---------  -----------
98 			.rx_buf = &adc->data,  in max1118_read()
105 		ret = spi_sync_transfer(adc->spi, xfers + 1, 2);  in max1118_read()
107 		ret = spi_sync_transfer(adc->spi, xfers, 3);  in max1118_read()
112 	return adc->data;  in max1118_read()
118 	const struct spi_device_id *id = spi_get_device_id(adc->spi);  in max1118_get_vref_mV()
121 	switch (id->driver_data) {  in max1118_get_vref_mV()
127 		vref_uV = regulator_get_voltage(adc->reg);  in max1118_get_vref_mV()
133 	return -ENODEV;  in max1118_get_vref_mV()
144 		mutex_lock(&adc->lock);  in max1118_read_raw()
145 		*val = max1118_read(indio_dev, chan->channel);  in max1118_read_raw()
146 		mutex_unlock(&adc->lock);  in max1118_read_raw()
160 	return -EINVAL;  in max1118_read_raw()
167 static irqreturn_t max1118_trigger_handler(int irq, void *p)  in max1118_trigger_handler()  argument
169 	struct iio_poll_func *pf = p;  in max1118_trigger_handler()
170 	struct iio_dev *indio_dev = pf->indio_dev;  in max1118_trigger_handler()
175 	mutex_lock(&adc->lock);  in max1118_trigger_handler()
177 	for_each_set_bit(scan_index, indio_dev->active_scan_mask,  in max1118_trigger_handler()
178 			indio_dev->masklength) {  in max1118_trigger_handler()
180 				&indio_dev->channels[scan_index];  in max1118_trigger_handler()
181 		int ret = max1118_read(indio_dev, scan_chan->channel);  in max1118_trigger_handler()
184 			dev_warn(&adc->spi->dev,  in max1118_trigger_handler()
189 		adc->scan.channels[i] = ret;  in max1118_trigger_handler()
192 	iio_push_to_buffers_with_timestamp(indio_dev, &adc->scan,  in max1118_trigger_handler()
195 	mutex_unlock(&adc->lock);  in max1118_trigger_handler()
197 	iio_trigger_notify_done(indio_dev->trig);  in max1118_trigger_handler()
214 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));  in max1118_probe()
216 		return -ENOMEM;  in max1118_probe()
219 	adc->spi = spi;  in max1118_probe()
220 	mutex_init(&adc->lock);  in max1118_probe()
222 	if (id->driver_data == max1118) {  in max1118_probe()
223 		adc->reg = devm_regulator_get(&spi->dev, "vref");  in max1118_probe()
224 		if (IS_ERR(adc->reg))  in max1118_probe()
225 			return dev_err_probe(&spi->dev, PTR_ERR(adc->reg),  in max1118_probe()
226 					     "failed to get vref regulator\n");  in max1118_probe()
227 		ret = regulator_enable(adc->reg);  in max1118_probe()
231 		ret = devm_add_action_or_reset(&spi->dev, max1118_reg_disable,  in max1118_probe()
232 					       adc->reg);  in max1118_probe()
238 	indio_dev->name = spi_get_device_id(spi)->name;  in max1118_probe()
239 	indio_dev->info = &max1118_info;  in max1118_probe()
240 	indio_dev->modes = INDIO_DIRECT_MODE;  in max1118_probe()
241 	indio_dev->channels = max1118_channels;  in max1118_probe()
242 	indio_dev->num_channels = ARRAY_SIZE(max1118_channels);  in max1118_probe()
252 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, NULL,  in max1118_probe()
257 	return devm_iio_device_register(&spi->dev, indio_dev);  in max1118_probe()