This source file includes following definitions.
- ns_thermal_get_temp
- ns_thermal_probe
- ns_thermal_remove
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6 #include <linux/module.h>
7 #include <linux/of_address.h>
8 #include <linux/platform_device.h>
9 #include <linux/thermal.h>
10
11 #define PVTMON_CONTROL0 0x00
12 #define PVTMON_CONTROL0_SEL_MASK 0x0000000e
13 #define PVTMON_CONTROL0_SEL_TEMP_MONITOR 0x00000000
14 #define PVTMON_CONTROL0_SEL_TEST_MODE 0x0000000e
15 #define PVTMON_STATUS 0x08
16
17 struct ns_thermal {
18 struct thermal_zone_device *tz;
19 void __iomem *pvtmon;
20 };
21
22 static int ns_thermal_get_temp(void *data, int *temp)
23 {
24 struct ns_thermal *ns_thermal = data;
25 int offset = thermal_zone_get_offset(ns_thermal->tz);
26 int slope = thermal_zone_get_slope(ns_thermal->tz);
27 u32 val;
28
29 val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);
30 if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {
31
32 val &= ~PVTMON_CONTROL0_SEL_MASK;
33
34
35 val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;
36
37 writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0);
38 }
39
40 val = readl(ns_thermal->pvtmon + PVTMON_STATUS);
41 *temp = slope * val + offset;
42
43 return 0;
44 }
45
46 static const struct thermal_zone_of_device_ops ns_thermal_ops = {
47 .get_temp = ns_thermal_get_temp,
48 };
49
50 static int ns_thermal_probe(struct platform_device *pdev)
51 {
52 struct device *dev = &pdev->dev;
53 struct ns_thermal *ns_thermal;
54
55 ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL);
56 if (!ns_thermal)
57 return -ENOMEM;
58
59 ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0);
60 if (WARN_ON(!ns_thermal->pvtmon))
61 return -ENOENT;
62
63 ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0,
64 ns_thermal,
65 &ns_thermal_ops);
66 if (IS_ERR(ns_thermal->tz)) {
67 iounmap(ns_thermal->pvtmon);
68 return PTR_ERR(ns_thermal->tz);
69 }
70
71 platform_set_drvdata(pdev, ns_thermal);
72
73 return 0;
74 }
75
76 static int ns_thermal_remove(struct platform_device *pdev)
77 {
78 struct ns_thermal *ns_thermal = platform_get_drvdata(pdev);
79
80 iounmap(ns_thermal->pvtmon);
81
82 return 0;
83 }
84
85 static const struct of_device_id ns_thermal_of_match[] = {
86 { .compatible = "brcm,ns-thermal", },
87 {},
88 };
89 MODULE_DEVICE_TABLE(of, ns_thermal_of_match);
90
91 static struct platform_driver ns_thermal_driver = {
92 .probe = ns_thermal_probe,
93 .remove = ns_thermal_remove,
94 .driver = {
95 .name = "ns-thermal",
96 .of_match_table = ns_thermal_of_match,
97 },
98 };
99 module_platform_driver(ns_thermal_driver);
100
101 MODULE_AUTHOR("Rafał Miłecki <rafal@milecki.pl>");
102 MODULE_DESCRIPTION("Northstar thermal driver");
103 MODULE_LICENSE("GPL v2");