Commit | Line | Data |
---|---|---|
71aa3693 TS |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. | |
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); | |
71aa3693 | 56 | sensor->mmio_base = devm_ioremap_resource(&pdev->dev, resource); |
8cd7ab2a | 57 | if (IS_ERR(sensor->mmio_base)) |
71aa3693 | 58 | return PTR_ERR(sensor->mmio_base); |
71aa3693 TS |
59 | |
60 | sensor_init_func = device_get_match_data(&pdev->dev); | |
61 | if (sensor_init_func) { | |
62 | ret = sensor_init_func(pdev, sensor); | |
63 | if (ret) { | |
64 | dev_err(&pdev->dev, | |
65 | "failed to initialize sensor (%d)\n", | |
66 | ret); | |
67 | return ret; | |
68 | } | |
69 | } | |
70 | ||
71 | thermal_zone = devm_thermal_zone_of_sensor_register(&pdev->dev, | |
72 | 0, | |
73 | sensor, | |
74 | &thermal_mmio_ops); | |
75 | if (IS_ERR(thermal_zone)) { | |
76 | dev_err(&pdev->dev, | |
77 | "failed to register sensor (%ld)\n", | |
78 | PTR_ERR(thermal_zone)); | |
79 | return PTR_ERR(thermal_zone); | |
80 | } | |
81 | ||
82 | thermal_mmio_get_temperature(sensor, &temperature); | |
83 | dev_info(&pdev->dev, | |
84 | "thermal mmio sensor %s registered, current temperature: %d\n", | |
85 | pdev->name, temperature); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static int al_thermal_init(struct platform_device *pdev, | |
91 | struct thermal_mmio *sensor) | |
92 | { | |
93 | sensor->read_mmio = thermal_mmio_readb; | |
94 | sensor->mask = 0xff; | |
95 | sensor->factor = 1000; | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static const struct of_device_id thermal_mmio_id_table[] = { | |
101 | { .compatible = "amazon,al-thermal", .data = al_thermal_init}, | |
102 | {} | |
103 | }; | |
104 | MODULE_DEVICE_TABLE(of, thermal_mmio_id_table); | |
105 | ||
106 | static struct platform_driver thermal_mmio_driver = { | |
107 | .probe = thermal_mmio_probe, | |
108 | .driver = { | |
109 | .name = "thermal-mmio", | |
71aa3693 TS |
110 | .of_match_table = of_match_ptr(thermal_mmio_id_table), |
111 | }, | |
112 | }; | |
113 | ||
114 | module_platform_driver(thermal_mmio_driver); | |
115 | ||
116 | MODULE_AUTHOR("Talel Shenhar <talel@amazon.com>"); | |
117 | MODULE_DESCRIPTION("Thermal MMIO Driver"); | |
118 | MODULE_LICENSE("GPL v2"); |