1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * powr1220.c - Driver for the Lattice POWR1220 programmable power supply
17 #include <linux/hwmon-sysfs.h>
71 	VCCA,  enumerator
102 	[VCCA]     = "vcca",
114 	mutex_lock(&data->update_lock);  in powr1220_read_adc()
116 	if (time_after(jiffies, data->adc_last_updated[ch_num] + HZ) ||  in powr1220_read_adc()
117 	    !data->adc_valid[ch_num]) {  in powr1220_read_adc()
124 		if (data->adc_maxes[ch_num] > ADC_MAX_LOW_MEASUREMENT_MV ||  in powr1220_read_adc()
125 		    data->adc_maxes[ch_num] == 0)  in powr1220_read_adc()
129 		result = i2c_smbus_write_byte_data(data->client, ADC_MUX,  in powr1220_read_adc()
141 		result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_LOW);  in powr1220_read_adc()
148 		result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_HIGH);  in powr1220_read_adc()
156 		data->adc_values[ch_num] = reading;  in powr1220_read_adc()
157 		data->adc_valid[ch_num] = true;  in powr1220_read_adc()
158 		data->adc_last_updated[ch_num] = jiffies;  in powr1220_read_adc()
161 		if (reading > data->adc_maxes[ch_num])  in powr1220_read_adc()
162 			data->adc_maxes[ch_num] = reading;  in powr1220_read_adc()
164 		result = data->adc_values[ch_num];  in powr1220_read_adc()
168 	mutex_unlock(&data->update_lock);  in powr1220_read_adc()
179 	if (channel >= chip_data->max_channels)  in powr1220_is_visible()
211 			return -EOPNOTSUPP;  in powr1220_read_string()
215 		return -EOPNOTSUPP;  in powr1220_read_string()
218 	return -EOPNOTSUPP;  in powr1220_read_string()
238 			*val = data->adc_maxes[channel];  in powr1220_read()
241 			return -EOPNOTSUPP;  in powr1220_read()
245 		return -EOPNOTSUPP;  in powr1220_read()
288 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))  in powr1220_probe()
289 		return -ENODEV;  in powr1220_probe()
291 	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);  in powr1220_probe()
293 		return -ENOMEM;  in powr1220_probe()
298 		data->max_channels = 10;  in powr1220_probe()
301 		data->max_channels = 12;  in powr1220_probe()
305 	mutex_init(&data->update_lock);  in powr1220_probe()
306 	data->client = client;  in powr1220_probe()
308 	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,  in powr1220_probe()
309 							 client->name,  in powr1220_probe()