projects / linux-block.git / blame
| 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"); |