1 // SPDX-License-Identifier: GPL-2.0+
7 …* Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5110_5112_5114.…
27 /* AD5110_EEPROM_RD data */
36 	int shift;  member
52 	[AD5112_05] = { .max_pos = 64, .kohms = 5, .shift = 1 },
53 	[AD5112_10] = { .max_pos = 64, .kohms = 10, .shift = 1 },
54 	[AD5112_80] = { .max_pos = 64, .kohms = 80, .shift = 1 },
55 	[AD5114_10] = { .max_pos = 32, .kohms = 10, .shift = 2 },
56 	[AD5114_80] = { .max_pos = 32, .kohms = 80, .shift = 2 },
81 static int ad5110_read(struct ad5110_data *data, u8 cmd, int *val)  in ad5110_read()  argument
85 	mutex_lock(&data->lock);  in ad5110_read()
86 	data->buf[0] = cmd;  in ad5110_read()
87 	data->buf[1] = *val;  in ad5110_read()
89 	ret = i2c_master_send_dmasafe(data->client, data->buf, sizeof(data->buf));  in ad5110_read()
92 	} else if (ret != sizeof(data->buf)) {  in ad5110_read()
93 		ret = -EIO;  in ad5110_read()
97 	ret = i2c_master_recv_dmasafe(data->client, data->buf, 1);  in ad5110_read()
101 		ret = -EIO;  in ad5110_read()
105 	*val = data->buf[0];  in ad5110_read()
109 	mutex_unlock(&data->lock);  in ad5110_read()
113 static int ad5110_write(struct ad5110_data *data, u8 cmd, u8 val)  in ad5110_write()  argument
117 	mutex_lock(&data->lock);  in ad5110_write()
118 	data->buf[0] = cmd;  in ad5110_write()
119 	data->buf[1] = val;  in ad5110_write()
121 	ret = i2c_master_send_dmasafe(data->client, data->buf, sizeof(data->buf));  in ad5110_write()
124 	} else if (ret != sizeof(data->buf)) {  in ad5110_write()
125 		ret = -EIO;  in ad5110_write()
132 	mutex_unlock(&data->lock);  in ad5110_write()
136 static int ad5110_resistor_tol(struct ad5110_data *data, u8 cmd, int val)  in ad5110_resistor_tol()  argument
140 	ret = ad5110_read(data, cmd, &val);  in ad5110_resistor_tol()
144 	data->tol = data->cfg->kohms * (val & GENMASK(6, 0)) * 10 / 8;  in ad5110_resistor_tol()
146 		data->tol *= -1;  in ad5110_resistor_tol()
156 	struct ad5110_data *data = iio_priv(indio_dev);  in store_eeprom_show()  local
160 	ret = ad5110_read(data, AD5110_EEPROM_RD, &val);  in store_eeprom_show()
164 	val = val >> data->cfg->shift;  in store_eeprom_show()
173 	struct ad5110_data *data = iio_priv(indio_dev);  in store_eeprom_store()  local
176 	ret = ad5110_write(data, AD5110_EEPROM_WR, 0);  in store_eeprom_store()
178 		dev_err(&data->client->dev, "RDAC to EEPROM write failed\n");  in store_eeprom_store()
182 	/* The storing of EEPROM data takes approximately 18 ms. */  in store_eeprom_store()
203 	struct ad5110_data *data = iio_priv(indio_dev);  in ad5110_read_raw()  local
208 		ret = ad5110_read(data, AD5110_RDAC_RD, val);  in ad5110_read_raw()
212 		*val = *val >> data->cfg->shift;  in ad5110_read_raw()
215 		*val = AD5110_WIPER_RESISTANCE * data->cfg->max_pos;  in ad5110_read_raw()
216 		*val2 = 1000 * data->cfg->kohms + data->tol;  in ad5110_read_raw()
219 		*val = 1000 * data->cfg->kohms + data->tol;  in ad5110_read_raw()
220 		*val2 = data->cfg->max_pos;  in ad5110_read_raw()
223 		*val = data->enable;  in ad5110_read_raw()
226 		return -EINVAL;  in ad5110_read_raw()
234 	struct ad5110_data *data = iio_priv(indio_dev);  in ad5110_write_raw()  local
239 		if (val > data->cfg->max_pos || val < 0)  in ad5110_write_raw()
240 			return -EINVAL;  in ad5110_write_raw()
242 		return ad5110_write(data, AD5110_RDAC_WR, val << data->cfg->shift);  in ad5110_write_raw()
245 			return -EINVAL;  in ad5110_write_raw()
246 		if (data->enable == val)  in ad5110_write_raw()
248 		ret = ad5110_write(data, AD5110_SHUTDOWN, val ? 0 : 1);  in ad5110_write_raw()
251 		data->enable = val;  in ad5110_write_raw()
254 		return -EINVAL;  in ad5110_write_raw()
266 			.data = &ad5110_cfg[cfg],	\
270 	AD5110_COMPATIBLE("adi,ad5110-10", AD5110_10),
271 	AD5110_COMPATIBLE("adi,ad5110-80", AD5110_80),
272 	AD5110_COMPATIBLE("adi,ad5112-05", AD5112_05),
273 	AD5110_COMPATIBLE("adi,ad5112-10", AD5112_10),
274 	AD5110_COMPATIBLE("adi,ad5112-80", AD5112_80),
275 	AD5110_COMPATIBLE("adi,ad5114-10", AD5114_10),
276 	AD5110_COMPATIBLE("adi,ad5114-80", AD5114_80),
282 	{ "ad5110-10", AD5110_10 },
283 	{ "ad5110-80", AD5110_80 },
284 	{ "ad5112-05", AD5112_05 },
285 	{ "ad5112-10", AD5112_10 },
286 	{ "ad5112-80", AD5112_80 },
287 	{ "ad5114-10", AD5114_10 },
288 	{ "ad5114-80", AD5114_80 },
295 	struct device *dev = &client->dev;  in ad5110_probe()
297 	struct ad5110_data *data;  in ad5110_probe()  local
300 	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));  in ad5110_probe()
302 		return -ENOMEM;  in ad5110_probe()
304 	data = iio_priv(indio_dev);  in ad5110_probe()
305 	data->client = client;  in ad5110_probe()
306 	mutex_init(&data->lock);  in ad5110_probe()
307 	data->enable = 1;  in ad5110_probe()
308 	data->cfg = device_get_match_data(dev);  in ad5110_probe()
311 	ret = ad5110_write(data, AD5110_RESET, 0);  in ad5110_probe()
317 	ret = ad5110_resistor_tol(data, AD5110_EEPROM_RD, AD5110_RESISTOR_TOL);  in ad5110_probe()
323 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad5110_probe()
324 	indio_dev->info = &ad5110_info;  in ad5110_probe()
325 	indio_dev->channels = ad5110_channels;  in ad5110_probe()
326 	indio_dev->num_channels = ARRAY_SIZE(ad5110_channels);  in ad5110_probe()
327 	indio_dev->name = client->name;  in ad5110_probe()