1 // SPDX-License-Identifier: GPL-2.0+
3  * Analog Devices AD5272 digital potentiometer driver
6  * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5272_5274.pdf
9  * ad5272	1	1024		20, 50, 100		01011xx
67 	data->buf[0] = (reg << 2) | ((val >> 8) & 0x3);  in ad5272_write()
68 	data->buf[1] = (u8)val;  in ad5272_write()
70 	mutex_lock(&data->lock);  in ad5272_write()
71 	ret = i2c_master_send(data->client, data->buf, sizeof(data->buf));  in ad5272_write()
72 	mutex_unlock(&data->lock);  in ad5272_write()
80 	data->buf[0] = reg << 2;  in ad5272_read()
81 	data->buf[1] = 0;  in ad5272_read()
83 	mutex_lock(&data->lock);  in ad5272_read()
84 	ret = i2c_master_send(data->client, data->buf, sizeof(data->buf));  in ad5272_read()
88 	ret = i2c_master_recv(data->client, data->buf, sizeof(data->buf));  in ad5272_read()
92 	*val = ((data->buf[0] & 0x3) << 8) | data->buf[1];  in ad5272_read()
95 	mutex_unlock(&data->lock);  in ad5272_read()
109 		*val = *val >> data->cfg->shift;  in ad5272_read_raw()
113 		*val = 1000 * data->cfg->kohms;  in ad5272_read_raw()
114 		*val2 = data->cfg->max_pos;  in ad5272_read_raw()
118 	return -EINVAL;  in ad5272_read_raw()
128 		return -EINVAL;  in ad5272_write_raw()
130 	if (val >= data->cfg->max_pos || val < 0 || val2)  in ad5272_write_raw()
131 		return -EINVAL;  in ad5272_write_raw()
133 	return ad5272_write(data, AD5272_RDAC_WR, val << data->cfg->shift);  in ad5272_write_raw()
145 	reset_gpio = devm_gpiod_get_optional(&data->client->dev, "reset",  in ad5272_reset()
164 	struct device *dev = &client->dev;  in ad5272_probe()
171 		return -ENOMEM;  in ad5272_probe()
176 	data->client = client;  in ad5272_probe()
177 	mutex_init(&data->lock);  in ad5272_probe()
178 	data->cfg = &ad5272_cfg[id->driver_data];  in ad5272_probe()
186 		return -ENODEV;  in ad5272_probe()
188 	indio_dev->info = &ad5272_info;  in ad5272_probe()
189 	indio_dev->channels = &ad5272_channel;  in ad5272_probe()
190 	indio_dev->num_channels = 1;  in ad5272_probe()
191 	indio_dev->name = client->name;  in ad5272_probe()
197 	{ .compatible = "adi,ad5272-020", .data = (void *)AD5272_020 },
198 	{ .compatible = "adi,ad5272-050", .data = (void *)AD5272_050 },
199 	{ .compatible = "adi,ad5272-100", .data = (void *)AD5272_100 },
200 	{ .compatible = "adi,ad5274-020", .data = (void *)AD5274_020 },
201 	{ .compatible = "adi,ad5274-100", .data = (void *)AD5274_100 },
207 	{ "ad5272-020", AD5272_020 },
208 	{ "ad5272-050", AD5272_050 },
209 	{ "ad5272-100", AD5272_100 },
210 	{ "ad5274-020", AD5274_020 },
211 	{ "ad5274-100", AD5274_100 },
218 		.name	= "ad5272",
228 MODULE_DESCRIPTION("AD5272 digital potentiometer");