1 // SPDX-License-Identifier: GPL-2.0-only
22 #include <linux/hwmon-sysfs.h>
26 /* Internal reference voltage (VREF, x 1000 */
30 static int vref = SMM665_VREF_ADC_X1000;  variable
31 module_param(vref, int, 0);
32 MODULE_PARM_DESC(vref, "Reference voltage in mV");
111  *  vref = Reference voltage on VREF_ADC pin (module parameter)
115 /* Voltage A-F and VDD */
116 #define SMM665_VMON_ADC_TO_VOLTS(adc)  ((adc) * vref / 256)
119 #define SMM665_12VIN_ADC_TO_VOLTS(adc) ((adc) * vref * 3 / 256)
122 #define SMM665_AIN_ADC_TO_VOLTS(adc)   ((adc) * vref / 512)
127 					 (((int)(adc) - 0x400) * 1000 / 4))
179 	struct i2c_client *client = data->cmdreg;  in smm665_read_adc()
188 	 *  {[S][addr][R][Ack]} {[datahi][Ack]} {[datalo][Ack][P]}  in smm665_read_adc()
194 	 * Then do a two-byte read transaction.  in smm665_read_adc()
197 	if (rv != -ENXIO) {  in smm665_read_adc()
200 		 * (per Documentation/i2c/fault-codes.rst).  in smm665_read_adc()
203 		dev_dbg(&client->dev,  in smm665_read_adc()
205 		return (rv < 0) ? rv : -EIO;  in smm665_read_adc()
208 	udelay(data->conversion_time);  in smm665_read_adc()
221 		dev_dbg(&client->dev, "Failed to read ADC value: error %d", rv);  in smm665_read_adc()
229 		dev_dbg(&client->dev, "Unexpected RADC: Expected %d got %d",  in smm665_read_adc()
231 		return -EIO;  in smm665_read_adc()
240 	struct i2c_client *client = data->client;  in smm665_update_device()
243 	mutex_lock(&data->update_lock);  in smm665_update_device()
245 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {  in smm665_update_device()
256 		data->faults = val;  in smm665_update_device()
265 			data->adc[i] = val;  in smm665_update_device()
267 		data->last_updated = jiffies;  in smm665_update_device()
268 		data->valid = 1;  in smm665_update_device()
271 	mutex_unlock(&data->update_lock);  in smm665_update_device()
317 	return data->alarm_min_limit[index];  in smm665_get_min()
324 	return data->alarm_max_limit[index];  in smm665_get_max()
331 	return data->critical_min_limit[index];  in smm665_get_lcrit()
338 	return data->critical_max_limit[index];  in smm665_get_crit()
351 	if (data->faults & (1 << attr->index))  in smm665_show_crit_alarm()
362 	int adc = attr->index;  in smm665_show_input()
368 	val = smm665_convert(data->adc[adc], adc);  in smm665_show_input()
377 	const int val = smm665_get_##what(dev, attr->index); \
569 	struct i2c_adapter *adapter = client->adapter;  in smm665_probe()
576 		return -ENODEV;  in smm665_probe()
579 		return -ENODEV;  in smm665_probe()
581 	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);  in smm665_probe()
583 		return -ENOMEM;  in smm665_probe()
586 	mutex_init(&data->update_lock);  in smm665_probe()
588 	data->client = client;  in smm665_probe()
589 	data->type = i2c_match_id(smm665_id, client)->driver_data;  in smm665_probe()
590 	data->cmdreg = i2c_new_dummy_device(adapter, (client->addr & ~SMM665_REGMASK)  in smm665_probe()
592 	if (IS_ERR(data->cmdreg))  in smm665_probe()
593 		return PTR_ERR(data->cmdreg);  in smm665_probe()
595 	switch (data->type) {  in smm665_probe()
598 		data->conversion_time = SMM665_ADC_WAIT_SMM665;  in smm665_probe()
603 		data->conversion_time = SMM665_ADC_WAIT_SMM766;  in smm665_probe()
607 	ret = -ENODEV;  in smm665_probe()
608 	if (i2c_smbus_read_byte_data(data->cmdreg, SMM665_MISC8_CMD_STS) < 0)  in smm665_probe()
628 	 * configured as critical or non-critical.  in smm665_probe()
636 		data->critical_min_limit[i] = data->alarm_min_limit[i]  in smm665_probe()
642 			data->critical_min_limit[i] = smm665_convert(val, i);  in smm665_probe()
644 			data->alarm_min_limit[i] = smm665_convert(val, i);  in smm665_probe()
648 		data->critical_max_limit[i] = data->alarm_max_limit[i]  in smm665_probe()
654 			data->critical_max_limit[i] = smm665_convert(val, i);  in smm665_probe()
656 			data->alarm_max_limit[i] = smm665_convert(val, i);  in smm665_probe()
659 	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,  in smm665_probe()
660 							   client->name, data,  in smm665_probe()
670 	i2c_unregister_device(data->cmdreg);  in smm665_probe()
678 	i2c_unregister_device(data->cmdreg);  in smm665_remove()