1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * max31790.c - Part of lm_sensors, Linux kernel modules for hardware
19 #define MAX31790_REG_FAN_CONFIG(ch)	(0x02 + (ch))  argument
20 #define MAX31790_REG_FAN_DYNAMICS(ch)	(0x08 + (ch))  argument
23 #define MAX31790_REG_TACH_COUNT(ch)	(0x18 + (ch) * 2)  argument
24 #define MAX31790_REG_PWM_DUTY_CYCLE(ch)	(0x30 + (ch) * 2)  argument
25 #define MAX31790_REG_PWMOUT(ch)		(0x40 + (ch) * 2)  argument
26 #define MAX31790_REG_TARGET_COUNT(ch)	(0x50 + (ch) * 2)  argument
68 	u16 tach[NR_CHANNEL * 2];  member
76 	struct i2c_client *client = data->client;  in max31790_update_device()
81 	mutex_lock(&data->update_lock);  in max31790_update_device()
83 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {  in max31790_update_device()
88 		data->fault_status |= rv & 0x3F;  in max31790_update_device()
94 		data->fault_status |= (rv & 0x3F) << 6;  in max31790_update_device()
101 			data->tach[i] = rv;  in max31790_update_device()
103 			if (data->fan_config[i]  in max31790_update_device()
110 				data->tach[NR_CHANNEL + i] = rv;  in max31790_update_device()
116 				data->pwm[i] = rv;  in max31790_update_device()
122 				data->target_count[i] = rv;  in max31790_update_device()
126 		data->last_updated = jiffies;  in max31790_update_device()
127 		data->valid = true;  in max31790_update_device()
132 	data->valid = false;  in max31790_update_device()
136 	mutex_unlock(&data->update_lock);  in max31790_update_device()
179 		sr = get_tach_period(data->fan_dynamics[channel % NR_CHANNEL]);  in max31790_read_fan()
180 		if (data->tach[channel] == FAN_COUNT_REG_MAX)  in max31790_read_fan()
183 			rpm = RPM_FROM_REG(data->tach[channel], sr);  in max31790_read_fan()
187 		sr = get_tach_period(data->fan_dynamics[channel]);  in max31790_read_fan()
188 		rpm = RPM_FROM_REG(data->target_count[channel], sr);  in max31790_read_fan()
192 		mutex_lock(&data->update_lock);  in max31790_read_fan()
193 		*val = !!(data->fault_status & (1 << channel));  in max31790_read_fan()
194 		data->fault_status &= ~(1 << channel);  in max31790_read_fan()
203 			i2c_smbus_write_byte_data(data->client, reg,  in max31790_read_fan()
204 						  data->target_count[channel % NR_CHANNEL] >> 8);  in max31790_read_fan()
206 		mutex_unlock(&data->update_lock);  in max31790_read_fan()
209 		*val = !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN);  in max31790_read_fan()
212 		return -EOPNOTSUPP;  in max31790_read_fan()
220 	struct i2c_client *client = data->client;  in max31790_write_fan()
226 	mutex_lock(&data->update_lock);  in max31790_write_fan()
232 		data->fan_dynamics[channel] =  in max31790_write_fan()
233 			((data->fan_dynamics[channel] &  in max31790_write_fan()
238 					data->fan_dynamics[channel]);  in max31790_write_fan()
242 		sr = get_tach_period(data->fan_dynamics[channel]);  in max31790_write_fan()
246 		data->target_count[channel] = target_count << 5;  in max31790_write_fan()
250 					data->target_count[channel]);  in max31790_write_fan()
253 		fan_config = data->fan_config[channel];  in max31790_write_fan()
259 			err = -EINVAL;  in max31790_write_fan()
262 		if (fan_config != data->fan_config[channel]) {  in max31790_write_fan()
266 				data->fan_config[channel] = fan_config;  in max31790_write_fan()
270 		err = -EOPNOTSUPP;  in max31790_write_fan()
274 	mutex_unlock(&data->update_lock);  in max31790_write_fan()
282 	u8 fan_config = data->fan_config[channel % NR_CHANNEL];  in max31790_fan_is_visible()
314 	fan_config = data->fan_config[channel];  in max31790_read_pwm()
318 		*val = data->pwm[channel] >> 8;  in max31790_read_pwm()
329 		return -EOPNOTSUPP;  in max31790_read_pwm()
337 	struct i2c_client *client = data->client;  in max31790_write_pwm()
341 	mutex_lock(&data->update_lock);  in max31790_write_pwm()
346 			err = -EINVAL;  in max31790_write_pwm()
352 		data->valid = false;  in max31790_write_pwm()
358 		fan_config = data->fan_config[channel];  in max31790_write_pwm()
378 			err = -EINVAL;  in max31790_write_pwm()
381 		if (fan_config != data->fan_config[channel]) {  in max31790_write_pwm()
385 				data->fan_config[channel] = fan_config;  in max31790_write_pwm()
389 		err = -EOPNOTSUPP;  in max31790_write_pwm()
393 	mutex_unlock(&data->update_lock);  in max31790_write_pwm()
401 	u8 fan_config = data->fan_config[channel];  in max31790_pwm_is_visible()
423 		return -EOPNOTSUPP;  in max31790_read()
436 		return -EOPNOTSUPP;  in max31790_write()
499 		data->fan_config[i] = rv;  in max31790_init_client()
505 		data->fan_dynamics[i] = rv;  in max31790_init_client()
513 	struct i2c_adapter *adapter = client->adapter;  in max31790_probe()
514 	struct device *dev = &client->dev;  in max31790_probe()
521 		return -ENODEV;  in max31790_probe()
525 		return -ENOMEM;  in max31790_probe()
527 	data->client = client;  in max31790_probe()
528 	mutex_init(&data->update_lock);  in max31790_probe()
537 	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,  in max31790_probe()