1 // SPDX-License-Identifier: GPL-2.0-only
3  * mcp4725.c - Support for Microchip MCP4725/6
9  * driver for the Microchip I2C 12-bit digital-to-analog converter (DAC)
10  * (7-bit I2C slave address 0x60, the three LSBs can be configured in
51 	outbuf[0] = (data->powerdown_mode + 1) << 4;  in mcp4725_suspend()
53 	data->powerdown = true;  in mcp4725_suspend()
55 	return i2c_master_send(data->client, outbuf, 2);  in mcp4725_suspend()
65 	outbuf[0] = (data->dac_value >> 8) & 0xf;  in mcp4725_resume()
66 	outbuf[1] = data->dac_value & 0xff;  in mcp4725_resume()
67 	data->powerdown = false;  in mcp4725_resume()
69 	return i2c_master_send(data->client, outbuf, 2);  in mcp4725_resume()
92 	inoutbuf[0] |= data->ref_mode << 3;  in mcp4725_store_eeprom()
93 	inoutbuf[0] |= data->powerdown ? ((data->powerdown_mode + 1) << 1) : 0;  in mcp4725_store_eeprom()
94 	inoutbuf[1] = data->dac_value >> 4;  in mcp4725_store_eeprom()
95 	inoutbuf[2] = (data->dac_value & 0xf) << 4;  in mcp4725_store_eeprom()
97 	ret = i2c_master_send(data->client, inoutbuf, 3);  in mcp4725_store_eeprom()
101 		return -EIO;  in mcp4725_store_eeprom()
104 	while (tries--) {  in mcp4725_store_eeprom()
106 		ret = i2c_master_recv(data->client, inoutbuf, 3);  in mcp4725_store_eeprom()
110 			return -EIO;  in mcp4725_store_eeprom()
117 		dev_err(&data->client->dev,  in mcp4725_store_eeprom()
118 			"mcp4725_store_eeprom() failed, incomplete\n");  in mcp4725_store_eeprom()
119 		return -EIO;  in mcp4725_store_eeprom()
153 	return data->powerdown_mode;  in mcp4725_get_powerdown_mode()
161 	data->powerdown_mode = mode;  in mcp4725_set_powerdown_mode()
171 	return sysfs_emit(buf, "%d\n", data->powerdown);  in mcp4725_read_powerdown()
187 		ret = mcp4725_suspend(&data->client->dev);  in mcp4725_write_powerdown()
189 		ret = mcp4725_resume(&data->client->dev);  in mcp4725_write_powerdown()
272 		return -EINVAL;  in mcp4725_set_value()
277 	ret = i2c_master_send(data->client, outbuf, 2);  in mcp4725_set_value()
281 		return -EIO;  in mcp4725_set_value()
293 	outbuf[0] |= data->ref_mode << 3;  in mcp4726_set_cfg()
294 	if (data->powerdown)  in mcp4726_set_cfg()
295 		outbuf[0] |= data->powerdown << 1;  in mcp4726_set_cfg()
296 	outbuf[1] = data->dac_value >> 4;  in mcp4726_set_cfg()
297 	outbuf[2] = (data->dac_value & 0xf) << 4;  in mcp4726_set_cfg()
299 	ret = i2c_master_send(data->client, outbuf, 3);  in mcp4726_set_cfg()
303 		return -EIO;  in mcp4726_set_cfg()
317 		*val = data->dac_value;  in mcp4725_read_raw()
320 		if (data->ref_mode == MCP472X_REF_VDD)  in mcp4725_read_raw()
321 			ret = regulator_get_voltage(data->vdd_reg);  in mcp4725_read_raw()
323 			ret = regulator_get_voltage(data->vref_reg);  in mcp4725_read_raw()
332 	return -EINVAL;  in mcp4725_read_raw()
345 		data->dac_value = val;  in mcp4725_write_raw()
348 		ret = -EINVAL;  in mcp4725_write_raw()
364 	/* check if is the vref-supply defined */  in mcp4725_probe_dt()
365 	pdata->use_vref = device_property_read_bool(dev, "vref-supply");  in mcp4725_probe_dt()
366 	pdata->vref_buffered =  in mcp4725_probe_dt()
367 		device_property_read_bool(dev, "microchip,vref-buffered");  in mcp4725_probe_dt()
383 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in mcp4725_probe()
385 		return -ENOMEM;  in mcp4725_probe()
388 	data->client = client;  in mcp4725_probe()
389 	if (dev_fwnode(&client->dev))  in mcp4725_probe()
390 		data->id = (uintptr_t)device_get_match_data(&client->dev);  in mcp4725_probe()
392 		data->id = id->driver_data;  in mcp4725_probe()
393 	pdata = dev_get_platdata(&client->dev);  in mcp4725_probe()
396 		err = mcp4725_probe_dt(&client->dev, &pdata_dt);  in mcp4725_probe()
398 			dev_err(&client->dev,  in mcp4725_probe()
405 	if (data->id == MCP4725 && pdata->use_vref) {  in mcp4725_probe()
406 		dev_err(&client->dev,  in mcp4725_probe()
408 		return -EINVAL;  in mcp4725_probe()
411 	if (!pdata->use_vref && pdata->vref_buffered) {  in mcp4725_probe()
412 		dev_err(&client->dev,  in mcp4725_probe()
414 		return -EINVAL;  in mcp4725_probe()
417 	if (!pdata->use_vref)  in mcp4725_probe()
418 		data->ref_mode = MCP472X_REF_VDD;  in mcp4725_probe()
420 		data->ref_mode = pdata->vref_buffered ?  in mcp4725_probe()
424 	data->vdd_reg = devm_regulator_get(&client->dev, "vdd");  in mcp4725_probe()
425 	if (IS_ERR(data->vdd_reg))  in mcp4725_probe()
426 		return PTR_ERR(data->vdd_reg);  in mcp4725_probe()
428 	err = regulator_enable(data->vdd_reg);  in mcp4725_probe()
432 	if (pdata->use_vref) {  in mcp4725_probe()
433 		data->vref_reg = devm_regulator_get(&client->dev, "vref");  in mcp4725_probe()
434 		if (IS_ERR(data->vref_reg)) {  in mcp4725_probe()
435 			err = PTR_ERR(data->vref_reg);  in mcp4725_probe()
439 		err = regulator_enable(data->vref_reg);  in mcp4725_probe()
444 	indio_dev->name = id->name;  in mcp4725_probe()
445 	indio_dev->info = &mcp4725_info;  in mcp4725_probe()
446 	indio_dev->channels = &mcp472x_channel[id->driver_data];  in mcp4725_probe()
447 	indio_dev->num_channels = 1;  in mcp4725_probe()
448 	indio_dev->modes = INDIO_DIRECT_MODE;  in mcp4725_probe()
451 	err = i2c_master_recv(client, inbuf, data->id == MCP4725 ? 3 : 4);  in mcp4725_probe()
454 		dev_err(&client->dev, "failed to read DAC value");  in mcp4725_probe()
458 	data->powerdown = pd > 0;  in mcp4725_probe()
459 	data->powerdown_mode = pd ? pd - 1 : 2; /* largest resistor to gnd */  in mcp4725_probe()
460 	data->dac_value = (inbuf[1] << 4) | (inbuf[2] >> 4);  in mcp4725_probe()
461 	if (data->id == MCP4726)  in mcp4725_probe()
464 	if (data->id == MCP4726 && ref != data->ref_mode) {  in mcp4725_probe()
465 		dev_info(&client->dev,  in mcp4725_probe()
467 			data->ref_mode, ref, data->ref_mode);  in mcp4725_probe()
480 	if (data->vref_reg)  in mcp4725_probe()
481 		regulator_disable(data->vref_reg);  in mcp4725_probe()
484 	regulator_disable(data->vdd_reg);  in mcp4725_probe()
496 	if (data->vref_reg)  in mcp4725_remove()
497 		regulator_disable(data->vref_reg);  in mcp4725_remove()
498 	regulator_disable(data->vdd_reg);  in mcp4725_remove()
534 MODULE_DESCRIPTION("MCP4725/6 12-bit DAC");