1 // SPDX-License-Identifier: GPL-2.0-only
4  * 7-bit, Multi-Channel Sink/Source Current DAC Driver
11 #include <linux/regulator/consumer.h>
14 #include <linux/iio/iio.h>
15 #include <linux/iio/driver.h>
16 #include <linux/iio/machine.h>
17 #include <linux/iio/consumer.h>
76 	mutex_lock(&data->lock);  in ds4424_get_value()
77 	ret = i2c_smbus_read_byte_data(data->client, DS4424_DAC_ADDR(channel));  in ds4424_get_value()
84 	mutex_unlock(&data->lock);  in ds4424_get_value()
94 	mutex_lock(&data->lock);  in ds4424_set_value()
95 	ret = i2c_smbus_write_byte_data(data->client,  in ds4424_set_value()
96 			DS4424_DAC_ADDR(chan->channel), val);  in ds4424_set_value()
100 	data->raw[chan->channel] = val;  in ds4424_set_value()
103 	mutex_unlock(&data->lock);  in ds4424_set_value()
116 		ret = ds4424_get_value(indio_dev, val, chan->channel);  in ds4424_read_raw()
125 			*val = -*val;  in ds4424_read_raw()
129 		return -EINVAL;  in ds4424_read_raw()
140 		return -EINVAL;  in ds4424_write_raw()
145 			return -EINVAL;  in ds4424_write_raw()
152 			raw.dx = -val;  in ds4424_write_raw()
158 		return -EINVAL;  in ds4424_write_raw()
168 		dev_err(&indio_dev->dev,  in ds4424_verify_chip()
182 	for (i = 0; i < indio_dev->num_channels; i++) {  in ds4424_suspend()
183 		data->save[i] = data->raw[i];  in ds4424_suspend()
185 				&indio_dev->channels[i]);  in ds4424_suspend()
200 	for (i = 0; i < indio_dev->num_channels; i++) {  in ds4424_resume()
201 		ret = ds4424_set_value(indio_dev, data->save[i],  in ds4424_resume()
202 				&indio_dev->channels[i]);  in ds4424_resume()
223 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in ds4424_probe()
225 		dev_err(&client->dev, "iio dev alloc failed.\n");  in ds4424_probe()
226 		return -ENOMEM;  in ds4424_probe()
231 	data->client = client;  in ds4424_probe()
232 	indio_dev->name = id->name;  in ds4424_probe()
234 	data->vcc_reg = devm_regulator_get(&client->dev, "vcc");  in ds4424_probe()
235 	if (IS_ERR(data->vcc_reg))  in ds4424_probe()
236 		return dev_err_probe(&client->dev, PTR_ERR(data->vcc_reg),  in ds4424_probe()
237 				     "Failed to get vcc-supply regulator.\n");  in ds4424_probe()
239 	mutex_init(&data->lock);  in ds4424_probe()
240 	ret = regulator_enable(data->vcc_reg);  in ds4424_probe()
242 		dev_err(&client->dev,  in ds4424_probe()
252 	switch (id->driver_data) {  in ds4424_probe()
254 		indio_dev->num_channels = DS4422_MAX_DAC_CHANNELS;  in ds4424_probe()
257 		indio_dev->num_channels = DS4424_MAX_DAC_CHANNELS;  in ds4424_probe()
260 		dev_err(&client->dev,  in ds4424_probe()
262 		ret = -ENXIO;  in ds4424_probe()
266 	indio_dev->channels = ds4424_channels;  in ds4424_probe()
267 	indio_dev->modes = INDIO_DIRECT_MODE;  in ds4424_probe()
268 	indio_dev->info = &ds4424_info;  in ds4424_probe()
272 		dev_err(&client->dev,  in ds4424_probe()
280 	regulator_disable(data->vcc_reg);  in ds4424_probe()
290 	regulator_disable(data->vcc_reg);  in ds4424_remove()