1 // SPDX-License-Identifier: GPL-2.0+
3  * Hardware monitoring driver for EMC2305 fan controller
59  * struct emc2305_cdev_data - device-specific cooling device state
67  * according to some system wise considerations, like absence of some replaceable units (PSU or
75  * From other side, fan speed is to be updated in hardware through 'pwm' only in case the
87  * struct emc2305_data - device-specific data
119 	return data->pwm_num;  in emc2305_get_max_channel()
124 	struct emc2305_data *data = cdev->devdata;  in emc2305_get_cdev_idx()
125 	size_t len = strlen(cdev->type);  in emc2305_get_cdev_idx()
129 		return -EINVAL;  in emc2305_get_cdev_idx()
140 	if (!data->pwm_separate)  in emc2305_get_cdev_idx()
143 	ret = cdev->type[len - 1];  in emc2305_get_cdev_idx()
146 		return ret - '1';  in emc2305_get_cdev_idx()
150 	return -EINVAL;  in emc2305_get_cdev_idx()
156 	struct emc2305_data *data = cdev->devdata;  in emc2305_get_cur_state()
162 	*state = data->cdev_data[cdev_idx].cur_state;  in emc2305_get_cur_state()
168 	struct emc2305_data *data = cdev->devdata;  in emc2305_get_max_state()
169 	*state = data->max_state;  in emc2305_get_max_state()
176 	struct i2c_client *client = data->client;  in __emc2305_set_cur_state()
179 	state = max_t(unsigned long, state, data->cdev_data[cdev_idx].last_hwmon_state);  in __emc2305_set_cur_state()
181 	val = EMC2305_PWM_STATE2DUTY(state, data->max_state, EMC2305_FAN_MAX);  in __emc2305_set_cur_state()
183 	data->cdev_data[cdev_idx].cur_state = state;  in __emc2305_set_cur_state()
184 	if (data->pwm_separate) {  in __emc2305_set_cur_state()
193 		for (i = 0; i < data->pwm_num; i++) {  in __emc2305_set_cur_state()
206 	struct emc2305_data *data = cdev->devdata;  in emc2305_set_cur_state()
208 	if (state > data->max_state)  in emc2305_set_cur_state()
209 		return -EINVAL;  in emc2305_set_cur_state()
216 	data->cdev_data[cdev_idx].last_thermal_state = state;  in emc2305_set_cur_state()
233 	struct i2c_client *client = data->client;  in emc2305_show_fault()
246 	struct i2c_client *client = data->client;  in emc2305_show_fan()
264 	struct i2c_client *client = data->client;  in emc2305_show_pwm()
272 	struct i2c_client *client = data->client;  in emc2305_set_pwm()
275 	if (val < data->pwm_min[channel] || val > EMC2305_FAN_MAX)  in emc2305_set_pwm()
276 		return -EINVAL;  in emc2305_set_pwm()
281 	data->cdev_data[channel].cur_state = EMC2305_PWM_DUTY2STATE(val, data->max_state,  in emc2305_set_pwm()
292 	cdev_idx = (idx) ? idx - 1 : 0;  in emc2305_set_single_tz()
293 	pwm = data->pwm_min[cdev_idx];  in emc2305_set_single_tz()
295 	data->cdev_data[cdev_idx].cdev =  in emc2305_set_single_tz()
299 	if (IS_ERR(data->cdev_data[cdev_idx].cdev)) {  in emc2305_set_single_tz()
301 		return PTR_ERR(data->cdev_data[cdev_idx].cdev);  in emc2305_set_single_tz()
304 	if (data->pwm_separate) {  in emc2305_set_single_tz()
309 		for (i = 0; i < data->pwm_num; i++) {  in emc2305_set_single_tz()
315 	data->cdev_data[cdev_idx].cur_state =  in emc2305_set_single_tz()
316 		EMC2305_PWM_DUTY2STATE(data->pwm_min[cdev_idx], data->max_state,  in emc2305_set_single_tz()
318 	data->cdev_data[cdev_idx].last_hwmon_state =  in emc2305_set_single_tz()
319 		EMC2305_PWM_DUTY2STATE(data->pwm_min[cdev_idx], data->max_state,  in emc2305_set_single_tz()
329 	if (!data->pwm_separate)  in emc2305_set_tz()
332 	for (i = 0; i < data->pwm_num; i++) {  in emc2305_set_tz()
351 		if (data->cdev_data[i].cdev)  in emc2305_unset_tz()
352 			thermal_cooling_device_unregister(data->cdev_data[i].cdev);  in emc2305_unset_tz()
399 			/* If thermal is configured - handle PWM limit setting. */  in emc2305_write()
401 				if (data->pwm_separate)  in emc2305_write()
405 				data->cdev_data[cdev_idx].last_hwmon_state =  in emc2305_write()
406 					EMC2305_PWM_DUTY2STATE(val, data->max_state,  in emc2305_write()
412 				if (data->cdev_data[cdev_idx].last_hwmon_state >=  in emc2305_write()
413 				    data->cdev_data[cdev_idx].last_thermal_state)  in emc2305_write()
415 							data->cdev_data[cdev_idx].last_hwmon_state);  in emc2305_write()
427 	return -EOPNOTSUPP;  in emc2305_write()
470 	return -EOPNOTSUPP;  in emc2305_read()
512 		data->pwm_num = 5;  in emc2305_identify()
515 		data->pwm_num = 3;  in emc2305_identify()
518 		data->pwm_num = 2;  in emc2305_identify()
521 		data->pwm_num = 1;  in emc2305_identify()
524 		return -ENODEV;  in emc2305_identify()
532 	struct i2c_adapter *adapter = client->adapter;  in emc2305_probe()
533 	struct device *dev = &client->dev;  in emc2305_probe()
541 		return -ENODEV;  in emc2305_probe()
545 		return -ENODEV;  in emc2305_probe()
549 		return -ENOMEM;  in emc2305_probe()
552 	data->client = client;  in emc2305_probe()
558 	pdata = dev_get_platdata(&client->dev);  in emc2305_probe()
560 		if (!pdata->max_state || pdata->max_state > EMC2305_FAN_MAX_STATE)  in emc2305_probe()
561 			return -EINVAL;  in emc2305_probe()
562 		data->max_state = pdata->max_state;  in emc2305_probe()
568 		if (!pdata->pwm_num || pdata->pwm_num > EMC2305_PWM_MAX)  in emc2305_probe()
569 			return -EINVAL;  in emc2305_probe()
570 		data->pwm_num = pdata->pwm_num;  in emc2305_probe()
571 		data->pwm_separate = pdata->pwm_separate;  in emc2305_probe()
573 			data->pwm_min[i] = pdata->pwm_min[i];  in emc2305_probe()
575 		data->max_state = EMC2305_FAN_MAX_STATE;  in emc2305_probe()
576 		data->pwm_separate = false;  in emc2305_probe()
578 			data->pwm_min[i] = EMC2305_FAN_MIN;  in emc2305_probe()
581 	data->hwmon_dev = devm_hwmon_device_register_with_info(dev, "emc2305", data,  in emc2305_probe()
583 	if (IS_ERR(data->hwmon_dev))  in emc2305_probe()
584 		return PTR_ERR(data->hwmon_dev);  in emc2305_probe()
592 	for (i = 0; i < data->pwm_num; i++) {  in emc2305_probe()
594 						data->pwm_min[i]);  in emc2305_probe()
604 	struct device *dev = &client->dev;  in emc2305_remove()