This source file includes following definitions.
- gpd_pocket_fan_set_speed
- gpd_pocket_fan_min_speed
- gpd_pocket_fan_worker
- gpd_pocket_fan_force_update
- gpd_pocket_fan_probe
- gpd_pocket_fan_remove
- gpd_pocket_fan_suspend
- gpd_pocket_fan_resume
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8 #include <linux/acpi.h>
9 #include <linux/gpio/consumer.h>
10 #include <linux/module.h>
11 #include <linux/moduleparam.h>
12 #include <linux/platform_device.h>
13 #include <linux/power_supply.h>
14 #include <linux/thermal.h>
15 #include <linux/workqueue.h>
16
17 #define MAX_SPEED 3
18
19 #define TEMP_LIMIT0_DEFAULT 55000
20 #define TEMP_LIMIT1_DEFAULT 60000
21 #define TEMP_LIMIT2_DEFAULT 65000
22
23 #define HYSTERESIS_DEFAULT 3000
24
25 #define SPEED_ON_AC_DEFAULT 2
26
27 static int temp_limits[3] = {
28 TEMP_LIMIT0_DEFAULT, TEMP_LIMIT1_DEFAULT, TEMP_LIMIT2_DEFAULT,
29 };
30 module_param_array(temp_limits, int, NULL, 0444);
31 MODULE_PARM_DESC(temp_limits,
32 "Millicelsius values above which the fan speed increases");
33
34 static int hysteresis = HYSTERESIS_DEFAULT;
35 module_param(hysteresis, int, 0444);
36 MODULE_PARM_DESC(hysteresis,
37 "Hysteresis in millicelsius before lowering the fan speed");
38
39 static int speed_on_ac = SPEED_ON_AC_DEFAULT;
40 module_param(speed_on_ac, int, 0444);
41 MODULE_PARM_DESC(speed_on_ac,
42 "minimum fan speed to allow when system is powered by AC");
43
44 struct gpd_pocket_fan_data {
45 struct device *dev;
46 struct thermal_zone_device *dts0;
47 struct thermal_zone_device *dts1;
48 struct gpio_desc *gpio0;
49 struct gpio_desc *gpio1;
50 struct delayed_work work;
51 int last_speed;
52 };
53
54 static void gpd_pocket_fan_set_speed(struct gpd_pocket_fan_data *fan, int speed)
55 {
56 if (speed == fan->last_speed)
57 return;
58
59 gpiod_direction_output(fan->gpio0, !!(speed & 1));
60 gpiod_direction_output(fan->gpio1, !!(speed & 2));
61
62 fan->last_speed = speed;
63 }
64
65 static int gpd_pocket_fan_min_speed(void)
66 {
67 if (power_supply_is_system_supplied())
68 return speed_on_ac;
69 else
70 return 0;
71 }
72
73 static void gpd_pocket_fan_worker(struct work_struct *work)
74 {
75 struct gpd_pocket_fan_data *fan =
76 container_of(work, struct gpd_pocket_fan_data, work.work);
77 int t0, t1, temp, speed, min_speed, i;
78
79 if (thermal_zone_get_temp(fan->dts0, &t0) ||
80 thermal_zone_get_temp(fan->dts1, &t1)) {
81 dev_warn(fan->dev, "Error getting temperature\n");
82 speed = MAX_SPEED;
83 goto set_speed;
84 }
85
86 temp = max(t0, t1);
87
88 speed = fan->last_speed;
89 min_speed = gpd_pocket_fan_min_speed();
90
91
92 for (i = min_speed; i < ARRAY_SIZE(temp_limits); i++) {
93 if (temp < temp_limits[i])
94 break;
95 }
96 if (speed < i)
97 speed = i;
98
99
100 for (i = min_speed; i < ARRAY_SIZE(temp_limits); i++) {
101 if (temp <= (temp_limits[i] - hysteresis))
102 break;
103 }
104 if (speed > i)
105 speed = i;
106
107 if (fan->last_speed <= 0 && speed)
108 speed = MAX_SPEED;
109
110 set_speed:
111 gpd_pocket_fan_set_speed(fan, speed);
112
113
114 queue_delayed_work(system_wq, &fan->work,
115 msecs_to_jiffies(4000 / (speed + 1)));
116 }
117
118 static void gpd_pocket_fan_force_update(struct gpd_pocket_fan_data *fan)
119 {
120 fan->last_speed = -1;
121 mod_delayed_work(system_wq, &fan->work, 0);
122 }
123
124 static int gpd_pocket_fan_probe(struct platform_device *pdev)
125 {
126 struct gpd_pocket_fan_data *fan;
127 int i;
128
129 for (i = 0; i < ARRAY_SIZE(temp_limits); i++) {
130 if (temp_limits[i] < 20000 || temp_limits[i] > 90000) {
131 dev_err(&pdev->dev, "Invalid temp-limit %d (must be between 20000 and 90000)\n",
132 temp_limits[i]);
133 temp_limits[0] = TEMP_LIMIT0_DEFAULT;
134 temp_limits[1] = TEMP_LIMIT1_DEFAULT;
135 temp_limits[2] = TEMP_LIMIT2_DEFAULT;
136 break;
137 }
138 }
139 if (hysteresis < 1000 || hysteresis > 10000) {
140 dev_err(&pdev->dev, "Invalid hysteresis %d (must be between 1000 and 10000)\n",
141 hysteresis);
142 hysteresis = HYSTERESIS_DEFAULT;
143 }
144 if (speed_on_ac < 0 || speed_on_ac > MAX_SPEED) {
145 dev_err(&pdev->dev, "Invalid speed_on_ac %d (must be between 0 and 3)\n",
146 speed_on_ac);
147 speed_on_ac = SPEED_ON_AC_DEFAULT;
148 }
149
150 fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
151 if (!fan)
152 return -ENOMEM;
153
154 fan->dev = &pdev->dev;
155 INIT_DELAYED_WORK(&fan->work, gpd_pocket_fan_worker);
156
157
158 fan->dts0 = thermal_zone_get_zone_by_name("soc_dts0");
159 if (IS_ERR(fan->dts0))
160 return -EPROBE_DEFER;
161
162 fan->dts1 = thermal_zone_get_zone_by_name("soc_dts1");
163 if (IS_ERR(fan->dts1))
164 return -EPROBE_DEFER;
165
166 fan->gpio0 = devm_gpiod_get_index(fan->dev, NULL, 0, GPIOD_ASIS);
167 if (IS_ERR(fan->gpio0))
168 return PTR_ERR(fan->gpio0);
169
170 fan->gpio1 = devm_gpiod_get_index(fan->dev, NULL, 1, GPIOD_ASIS);
171 if (IS_ERR(fan->gpio1))
172 return PTR_ERR(fan->gpio1);
173
174 gpd_pocket_fan_force_update(fan);
175
176 platform_set_drvdata(pdev, fan);
177 return 0;
178 }
179
180 static int gpd_pocket_fan_remove(struct platform_device *pdev)
181 {
182 struct gpd_pocket_fan_data *fan = platform_get_drvdata(pdev);
183
184 cancel_delayed_work_sync(&fan->work);
185 return 0;
186 }
187
188 #ifdef CONFIG_PM_SLEEP
189 static int gpd_pocket_fan_suspend(struct device *dev)
190 {
191 struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev);
192
193 cancel_delayed_work_sync(&fan->work);
194 gpd_pocket_fan_set_speed(fan, gpd_pocket_fan_min_speed());
195 return 0;
196 }
197
198 static int gpd_pocket_fan_resume(struct device *dev)
199 {
200 struct gpd_pocket_fan_data *fan = dev_get_drvdata(dev);
201
202 gpd_pocket_fan_force_update(fan);
203 return 0;
204 }
205 #endif
206 static SIMPLE_DEV_PM_OPS(gpd_pocket_fan_pm_ops,
207 gpd_pocket_fan_suspend,
208 gpd_pocket_fan_resume);
209
210 static struct acpi_device_id gpd_pocket_fan_acpi_match[] = {
211 { "FAN02501" },
212 {},
213 };
214 MODULE_DEVICE_TABLE(acpi, gpd_pocket_fan_acpi_match);
215
216 static struct platform_driver gpd_pocket_fan_driver = {
217 .probe = gpd_pocket_fan_probe,
218 .remove = gpd_pocket_fan_remove,
219 .driver = {
220 .name = "gpd_pocket_fan",
221 .acpi_match_table = gpd_pocket_fan_acpi_match,
222 .pm = &gpd_pocket_fan_pm_ops,
223 },
224 };
225
226 module_platform_driver(gpd_pocket_fan_driver);
227 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");
228 MODULE_DESCRIPTION("GPD pocket fan driver");
229 MODULE_LICENSE("GPL");