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>
69 	VCCA,  enumerator
99 	[VCCA]     = "vcca",
111 	mutex_lock(&data->update_lock);  in powr1220_read_adc()
113 	if (time_after(jiffies, data->adc_last_updated[ch_num] + HZ) ||  in powr1220_read_adc()
114 			!data->adc_valid[ch_num]) {  in powr1220_read_adc()
121 		if (data->adc_maxes[ch_num] > ADC_MAX_LOW_MEASUREMENT_MV ||  in powr1220_read_adc()
122 				data->adc_maxes[ch_num] == 0)  in powr1220_read_adc()
126 		result = i2c_smbus_write_byte_data(data->client, ADC_MUX,  in powr1220_read_adc()
138 		result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_LOW);  in powr1220_read_adc()
145 		result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_HIGH);  in powr1220_read_adc()
153 		data->adc_values[ch_num] = reading;  in powr1220_read_adc()
154 		data->adc_valid[ch_num] = true;  in powr1220_read_adc()
155 		data->adc_last_updated[ch_num] = jiffies;  in powr1220_read_adc()
158 		if (reading > data->adc_maxes[ch_num])  in powr1220_read_adc()
159 			data->adc_maxes[ch_num] = reading;  in powr1220_read_adc()
161 		result = data->adc_values[ch_num];  in powr1220_read_adc()
165 	mutex_unlock(&data->update_lock);  in powr1220_read_adc()
176 	int adc_val = powr1220_read_adc(dev, attr->index);  in powr1220_voltage_show()
191 	return sprintf(buf, "%d\n", data->adc_maxes[attr->index]);  in powr1220_max_show()
201 	return sprintf(buf, "%s\n", input_names[attr->index]);  in powr1220_label_show()
216 static SENSOR_DEVICE_ATTR_RO(in12_input, powr1220_voltage, VCCA);
231 static SENSOR_DEVICE_ATTR_RO(in12_highest, powr1220_max, VCCA);
246 static SENSOR_DEVICE_ATTR_RO(in12_label, powr1220_label, VCCA);
305 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))  in powr1220_probe()
306 		return -ENODEV;  in powr1220_probe()
308 	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);  in powr1220_probe()
310 		return -ENOMEM;  in powr1220_probe()
312 	mutex_init(&data->update_lock);  in powr1220_probe()
313 	data->client = client;  in powr1220_probe()
315 	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,  in powr1220_probe()
316 			client->name, data, powr1220_groups);  in powr1220_probe()