1 // SPDX-License-Identifier: GPL-2.0-or-later
20  *        http://pdfserv.maxim-ic.com/en/ds/MAX6620.pdf
95 /* Minimum and maximum values of the FAN-RPM */
142 	u16 target[4];  member
150 static u16 max6620_fan_rpm_to_tach(u8 div, int rpm)  in max6620_fan_rpm_to_tach()  argument
152 	return (60 * div * MAX6620_CLOCK_FREQ) / (rpm * MAX6620_PULSE_PER_REV);  in max6620_fan_rpm_to_tach()
163 	struct i2c_client *client = data->client;  in max6620_update_device()
167 	mutex_lock(&data->update_lock);  in max6620_update_device()
169 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {  in max6620_update_device()
174 			data->fancfg[i] = ret;  in max6620_update_device()
179 			data->fandyn[i] = ret;  in max6620_update_device()
184 			data->tach[i] = (ret << 3) & 0x7f8;  in max6620_update_device()
188 			data->tach[i] |= (ret >> 5) & 0x7;  in max6620_update_device()
193 			data->target[i] = (ret << 3) & 0x7f8;  in max6620_update_device()
197 			data->target[i] |= (ret >> 5) & 0x7;  in max6620_update_device()
208 		data->fault |= (ret >> 4) & (ret & 0x0F);  in max6620_update_device()
210 		data->last_updated = jiffies;  in max6620_update_device()
211 		data->valid = true;  in max6620_update_device()
215 	mutex_unlock(&data->update_lock);  in max6620_update_device()
258 	client = data->client;  in max6620_read()
264 			mutex_lock(&data->update_lock);  in max6620_read()
265 			*val = !!(data->fault & BIT(channel));  in max6620_read()
267 			/* Setting TACH count to re-enable fan fault detection */  in max6620_read()
269 				val1 = (data->target[channel] >> 3) & 0xff;  in max6620_read()
270 				val2 = (data->target[channel] << 5) & 0xe0;  in max6620_read()
274 					mutex_unlock(&data->update_lock);  in max6620_read()
280 					mutex_unlock(&data->update_lock);  in max6620_read()
284 				data->fault &= ~BIT(channel);  in max6620_read()
286 			mutex_unlock(&data->update_lock);  in max6620_read()
290 			*val = max6620_fan_div_from_reg(data->fandyn[channel]);  in max6620_read()
293 			if (data->tach[channel] == 0) {  in max6620_read()
296 				div = max6620_fan_div_from_reg(data->fandyn[channel]);  in max6620_read()
297 				*val = max6620_fan_tach_to_rpm(div, data->tach[channel]);  in max6620_read()
301 			if (data->target[channel] == 0) {  in max6620_read()
304 				div = max6620_fan_div_from_reg(data->fandyn[channel]);  in max6620_read()
305 				*val = max6620_fan_tach_to_rpm(div, data->target[channel]);  in max6620_read()
309 			return -EOPNOTSUPP;  in max6620_read()
314 		return -EOPNOTSUPP;  in max6620_read()
336 	client = data->client;  in max6620_write()
337 	mutex_lock(&data->update_lock);  in max6620_write()
363 				ret = -EINVAL;  in max6620_write()
366 			data->fandyn[channel] &= 0x1F;  in max6620_write()
367 			data->fandyn[channel] |= div << 5;  in max6620_write()
369 							data->fandyn[channel]);  in max6620_write()
373 			div = max6620_fan_div_from_reg(data->fandyn[channel]);  in max6620_write()
384 			/* Setting TACH count re-enables fan fault detection */  in max6620_write()
385 			data->fault &= ~BIT(channel);  in max6620_write()
389 			ret = -EOPNOTSUPP;  in max6620_write()
395 		ret = -EOPNOTSUPP;  in max6620_write()
400 	mutex_unlock(&data->update_lock);  in max6620_write()
426 	struct i2c_client *client = data->client;  in max6620_init_client()
434 		dev_err(&client->dev, "Error reading config, aborting.\n");  in max6620_init_client()
444 		dev_err(&client->dev, "Config write error, aborting.\n");  in max6620_init_client()
452 		data->fancfg[i] = reg;  in max6620_init_client()
454 		/* Enable RPM mode */  in max6620_init_client()
455 		data->fancfg[i] |= 0xa8;  in max6620_init_client()
456 		err = i2c_smbus_write_byte_data(client, config_reg[i], data->fancfg[i]);  in max6620_init_client()
461 		data->fandyn[i] = 0x30;  in max6620_init_client()
462 		err = i2c_smbus_write_byte_data(client, dyn_reg[i], data->fandyn[i]);  in max6620_init_client()
471 	struct device *dev = &client->dev;  in max6620_probe()
478 		return -ENOMEM;  in max6620_probe()
480 	data->client = client;  in max6620_probe()
481 	mutex_init(&data->update_lock);  in max6620_probe()
487 	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,  in max6620_probe()