1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * g760a - Driver for the Global Mixed-mode Technology Inc. G760A
9  * http://www.gmt.com.tw/product/datasheet/EDS-760A.pdf
18 #include <linux/hwmon-sysfs.h>
29 #define G760A_REG_FAN_STA_RPM_OFF 0x1 /* +/-20% off */
48 	u8 act_cnt; /*   formula: cnt = (CLK * 30)/(rpm * P) */
58 #define PWM_FROM_CNT(cnt)	(0xff-(cnt))  argument
59 #define PWM_TO_CNT(pwm)		(0xff-(pwm))
85 	struct i2c_client *client = data->client;  in g760a_update_client()
87 	mutex_lock(&data->update_lock);  in g760a_update_client()
89 	if (time_after(jiffies, data->last_updated + G760A_UPDATE_INTERVAL)  in g760a_update_client()
90 	    || !data->valid) {  in g760a_update_client()
91 		dev_dbg(&client->dev, "Starting g760a update\n");  in g760a_update_client()
93 		data->set_cnt = g760a_read_value(client, G760A_REG_SET_CNT);  in g760a_update_client()
94 		data->act_cnt = g760a_read_value(client, G760A_REG_ACT_CNT);  in g760a_update_client()
95 		data->fan_sta = g760a_read_value(client, G760A_REG_FAN_STA);  in g760a_update_client()
97 		data->last_updated = jiffies;  in g760a_update_client()
98 		data->valid = true;  in g760a_update_client()
101 	mutex_unlock(&data->update_lock);  in g760a_update_client()
112 	mutex_lock(&data->update_lock);  in fan1_input_show()
113 	if (!(data->fan_sta & G760A_REG_FAN_STA_RPM_LOW))  in fan1_input_show()
114 		rpm = rpm_from_cnt(data->act_cnt, data->clk, data->fan_div);  in fan1_input_show()
115 	mutex_unlock(&data->update_lock);  in fan1_input_show()
125 	int fan_alarm = (data->fan_sta & G760A_REG_FAN_STA_RPM_OFF) ? 1 : 0;  in fan1_alarm_show()
135 	return sprintf(buf, "%d\n", PWM_FROM_CNT(data->set_cnt));  in pwm1_show()
142 	struct i2c_client *client = data->client;  in pwm1_store()
146 		return -EINVAL;  in pwm1_store()
148 	mutex_lock(&data->update_lock);  in pwm1_store()
149 	data->set_cnt = PWM_TO_CNT(clamp_val(val, 0, 255));  in pwm1_store()
150 	g760a_write_value(client, G760A_REG_SET_CNT, data->set_cnt);  in pwm1_store()
151 	mutex_unlock(&data->update_lock);  in pwm1_store()
161 	&dev_attr_pwm1.attr,
162 	&dev_attr_fan1_input.attr,
163 	&dev_attr_fan1_alarm.attr,
170  * new-style driver model code
175 	struct device *dev = &client->dev;  in g760a_probe()
179 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))  in g760a_probe()
180 		return -EIO;  in g760a_probe()
184 		return -ENOMEM;  in g760a_probe()
186 	data->client = client;  in g760a_probe()
187 	mutex_init(&data->update_lock);  in g760a_probe()
190 	data->fan_div = G760A_DEFAULT_FAN_DIV;  in g760a_probe()
191 	data->clk = G760A_DEFAULT_CLK;  in g760a_probe()
193 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in g760a_probe()
207 		.name	= "g760a",