This source file includes following definitions.
- thermal_mmio_readb
- thermal_mmio_get_temperature
- thermal_mmio_probe
- al_thermal_init
1
2
3
4
5
6 #include <linux/module.h>
7 #include <linux/of_address.h>
8 #include <linux/platform_device.h>
9 #include <linux/thermal.h>
10
11 struct thermal_mmio {
12 void __iomem *mmio_base;
13 u32 (*read_mmio)(void __iomem *mmio_base);
14 u32 mask;
15 int factor;
16 };
17
18 static u32 thermal_mmio_readb(void __iomem *mmio_base)
19 {
20 return readb(mmio_base);
21 }
22
23 static int thermal_mmio_get_temperature(void *private, int *temp)
24 {
25 int t;
26 struct thermal_mmio *sensor =
27 (struct thermal_mmio *)private;
28
29 t = sensor->read_mmio(sensor->mmio_base) & sensor->mask;
30 t *= sensor->factor;
31
32 *temp = t;
33
34 return 0;
35 }
36
37 static struct thermal_zone_of_device_ops thermal_mmio_ops = {
38 .get_temp = thermal_mmio_get_temperature,
39 };
40
41 static int thermal_mmio_probe(struct platform_device *pdev)
42 {
43 struct resource *resource;
44 struct thermal_mmio *sensor;
45 int (*sensor_init_func)(struct platform_device *pdev,
46 struct thermal_mmio *sensor);
47 struct thermal_zone_device *thermal_zone;
48 int ret;
49 int temperature;
50
51 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
52 if (!sensor)
53 return -ENOMEM;
54
55 resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
56 sensor->mmio_base = devm_ioremap_resource(&pdev->dev, resource);
57 if (IS_ERR(sensor->mmio_base)) {
58 dev_err(&pdev->dev, "failed to ioremap memory (%ld)\n",
59 PTR_ERR(sensor->mmio_base));
60 return PTR_ERR(sensor->mmio_base);
61 }
62
63 sensor_init_func = device_get_match_data(&pdev->dev);
64 if (sensor_init_func) {
65 ret = sensor_init_func(pdev, sensor);
66 if (ret) {
67 dev_err(&pdev->dev,
68 "failed to initialize sensor (%d)\n",
69 ret);
70 return ret;
71 }
72 }
73
74 thermal_zone = devm_thermal_zone_of_sensor_register(&pdev->dev,
75 0,
76 sensor,
77 &thermal_mmio_ops);
78 if (IS_ERR(thermal_zone)) {
79 dev_err(&pdev->dev,
80 "failed to register sensor (%ld)\n",
81 PTR_ERR(thermal_zone));
82 return PTR_ERR(thermal_zone);
83 }
84
85 thermal_mmio_get_temperature(sensor, &temperature);
86 dev_info(&pdev->dev,
87 "thermal mmio sensor %s registered, current temperature: %d\n",
88 pdev->name, temperature);
89
90 return 0;
91 }
92
93 static int al_thermal_init(struct platform_device *pdev,
94 struct thermal_mmio *sensor)
95 {
96 sensor->read_mmio = thermal_mmio_readb;
97 sensor->mask = 0xff;
98 sensor->factor = 1000;
99
100 return 0;
101 }
102
103 static const struct of_device_id thermal_mmio_id_table[] = {
104 { .compatible = "amazon,al-thermal", .data = al_thermal_init},
105 {}
106 };
107 MODULE_DEVICE_TABLE(of, thermal_mmio_id_table);
108
109 static struct platform_driver thermal_mmio_driver = {
110 .probe = thermal_mmio_probe,
111 .driver = {
112 .name = "thermal-mmio",
113 .owner = THIS_MODULE,
114 .of_match_table = of_match_ptr(thermal_mmio_id_table),
115 },
116 };
117
118 module_platform_driver(thermal_mmio_driver);
119
120 MODULE_AUTHOR("Talel Shenhar <talel@amazon.com>");
121 MODULE_DESCRIPTION("Thermal MMIO Driver");
122 MODULE_LICENSE("GPL v2");