1 // SPDX-License-Identifier: GPL-2.0+
3  * GPD Pocket fan controller driver
9 #include <linux/devm-helpers.h>
33 		 "Millicelsius values above which the fan speed increases");
38 		 "Hysteresis in millicelsius before lowering the fan speed");
43 		 "minimum fan speed to allow when system is powered by AC");
55 static void gpd_pocket_fan_set_speed(struct gpd_pocket_fan_data *fan, int speed)  in gpd_pocket_fan_set_speed()  argument
57 	if (speed == fan->last_speed)  in gpd_pocket_fan_set_speed()
60 	gpiod_direction_output(fan->gpio0, !!(speed & 1));  in gpd_pocket_fan_set_speed()
61 	gpiod_direction_output(fan->gpio1, !!(speed & 2));  in gpd_pocket_fan_set_speed()
63 	fan->last_speed = speed;  in gpd_pocket_fan_set_speed()
71 		return 0;  in gpd_pocket_fan_min_speed()
76 	struct gpd_pocket_fan_data *fan =  in gpd_pocket_fan_worker()  local
80 	if (thermal_zone_get_temp(fan->dts0, &t0) ||  in gpd_pocket_fan_worker()
81 	    thermal_zone_get_temp(fan->dts1, &t1)) {  in gpd_pocket_fan_worker()
82 		dev_warn(fan->dev, "Error getting temperature\n");  in gpd_pocket_fan_worker()
89 	speed = fan->last_speed;  in gpd_pocket_fan_worker()
102 		if (temp <= (temp_limits[i] - hysteresis))  in gpd_pocket_fan_worker()
108 	if (fan->last_speed <= 0 && speed)  in gpd_pocket_fan_worker()
112 	gpd_pocket_fan_set_speed(fan, speed);  in gpd_pocket_fan_worker()
115 	queue_delayed_work(system_wq, &fan->work,  in gpd_pocket_fan_worker()
119 static void gpd_pocket_fan_force_update(struct gpd_pocket_fan_data *fan)  in gpd_pocket_fan_force_update()  argument
121 	fan->last_speed = -1;  in gpd_pocket_fan_force_update()
122 	mod_delayed_work(system_wq, &fan->work, 0);  in gpd_pocket_fan_force_update()
127 	struct gpd_pocket_fan_data *fan;  in gpd_pocket_fan_probe()  local
130 	for (i = 0; i < ARRAY_SIZE(temp_limits); i++) {  in gpd_pocket_fan_probe()
132 			dev_err(&pdev->dev, "Invalid temp-limit %d (must be between 20000 and 90000)\n",  in gpd_pocket_fan_probe()
134 			temp_limits[0] = TEMP_LIMIT0_DEFAULT;  in gpd_pocket_fan_probe()
141 		dev_err(&pdev->dev, "Invalid hysteresis %d (must be between 1000 and 10000)\n",  in gpd_pocket_fan_probe()
145 	if (speed_on_ac < 0 || speed_on_ac > MAX_SPEED) {  in gpd_pocket_fan_probe()
146 		dev_err(&pdev->dev, "Invalid speed_on_ac %d (must be between 0 and 3)\n",  in gpd_pocket_fan_probe()
151 	fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);  in gpd_pocket_fan_probe()
152 	if (!fan)  in gpd_pocket_fan_probe()
153 		return -ENOMEM;  in gpd_pocket_fan_probe()
155 	fan->dev = &pdev->dev;  in gpd_pocket_fan_probe()
156 	ret = devm_delayed_work_autocancel(&pdev->dev, &fan->work,  in gpd_pocket_fan_probe()
162 	fan->dts0 = thermal_zone_get_zone_by_name("soc_dts0");  in gpd_pocket_fan_probe()
163 	if (IS_ERR(fan->dts0))  in gpd_pocket_fan_probe()
164 		return -EPROBE_DEFER;  in gpd_pocket_fan_probe()
166 	fan->dts1 = thermal_zone_get_zone_by_name("soc_dts1");  in gpd_pocket_fan_probe()
167 	if (IS_ERR(fan->dts1))  in gpd_pocket_fan_probe()
168 		return -EPROBE_DEFER;  in gpd_pocket_fan_probe()
170 	fan->gpio0 = devm_gpiod_get_index(fan->dev, NULL, 0, GPIOD_ASIS);  in gpd_pocket_fan_probe()
171 	if (IS_ERR(fan->gpio0))  in gpd_pocket_fan_probe()
172 		return PTR_ERR(fan->gpio0);  in gpd_pocket_fan_probe()
174 	fan->gpio1 = devm_gpiod_get_index(fan->dev, NULL, 1, GPIOD_ASIS);  in gpd_pocket_fan_probe()
175 	if (IS_ERR(fan->gpio1))  in gpd_pocket_fan_probe()
176 		return PTR_ERR(fan->gpio1);  in gpd_pocket_fan_probe()
178 	gpd_pocket_fan_force_update(fan);  in gpd_pocket_fan_probe()
180 	platform_set_drvdata(pdev, fan);  in gpd_pocket_fan_probe()
181 	return 0;  in gpd_pocket_fan_probe()
187 	struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev);  in gpd_pocket_fan_suspend()  local
189 	cancel_delayed_work_sync(&fan->work);  in gpd_pocket_fan_suspend()
190 	gpd_pocket_fan_set_speed(fan, gpd_pocket_fan_min_speed());  in gpd_pocket_fan_suspend()
191 	return 0;  in gpd_pocket_fan_suspend()
196 	struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev);  in gpd_pocket_fan_resume()  local
198 	gpd_pocket_fan_force_update(fan);  in gpd_pocket_fan_resume()
199 	return 0;  in gpd_pocket_fan_resume()
223 MODULE_DESCRIPTION("GPD pocket fan driver");