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118 lines
2.7 KiB
118 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
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*/ |
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#include <linux/module.h> |
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#include <linux/of_address.h> |
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#include <linux/platform_device.h> |
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#include <linux/thermal.h> |
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struct thermal_mmio { |
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void __iomem *mmio_base; |
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u32 (*read_mmio)(void __iomem *mmio_base); |
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u32 mask; |
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int factor; |
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}; |
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static u32 thermal_mmio_readb(void __iomem *mmio_base) |
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{ |
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return readb(mmio_base); |
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} |
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static int thermal_mmio_get_temperature(void *private, int *temp) |
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{ |
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int t; |
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struct thermal_mmio *sensor = |
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(struct thermal_mmio *)private; |
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t = sensor->read_mmio(sensor->mmio_base) & sensor->mask; |
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t *= sensor->factor; |
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*temp = t; |
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return 0; |
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} |
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static struct thermal_zone_of_device_ops thermal_mmio_ops = { |
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.get_temp = thermal_mmio_get_temperature, |
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}; |
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static int thermal_mmio_probe(struct platform_device *pdev) |
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{ |
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struct resource *resource; |
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struct thermal_mmio *sensor; |
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int (*sensor_init_func)(struct platform_device *pdev, |
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struct thermal_mmio *sensor); |
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struct thermal_zone_device *thermal_zone; |
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int ret; |
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int temperature; |
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sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL); |
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if (!sensor) |
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return -ENOMEM; |
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resource = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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sensor->mmio_base = devm_ioremap_resource(&pdev->dev, resource); |
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if (IS_ERR(sensor->mmio_base)) |
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return PTR_ERR(sensor->mmio_base); |
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sensor_init_func = device_get_match_data(&pdev->dev); |
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if (sensor_init_func) { |
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ret = sensor_init_func(pdev, sensor); |
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if (ret) { |
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dev_err(&pdev->dev, |
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"failed to initialize sensor (%d)\n", |
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ret); |
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return ret; |
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} |
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} |
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thermal_zone = devm_thermal_zone_of_sensor_register(&pdev->dev, |
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0, |
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sensor, |
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&thermal_mmio_ops); |
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if (IS_ERR(thermal_zone)) { |
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dev_err(&pdev->dev, |
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"failed to register sensor (%ld)\n", |
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PTR_ERR(thermal_zone)); |
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return PTR_ERR(thermal_zone); |
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} |
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thermal_mmio_get_temperature(sensor, &temperature); |
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dev_info(&pdev->dev, |
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"thermal mmio sensor %s registered, current temperature: %d\n", |
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pdev->name, temperature); |
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return 0; |
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} |
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static int al_thermal_init(struct platform_device *pdev, |
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struct thermal_mmio *sensor) |
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{ |
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sensor->read_mmio = thermal_mmio_readb; |
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sensor->mask = 0xff; |
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sensor->factor = 1000; |
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return 0; |
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} |
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static const struct of_device_id thermal_mmio_id_table[] = { |
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{ .compatible = "amazon,al-thermal", .data = al_thermal_init}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, thermal_mmio_id_table); |
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static struct platform_driver thermal_mmio_driver = { |
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.probe = thermal_mmio_probe, |
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.driver = { |
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.name = "thermal-mmio", |
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.of_match_table = of_match_ptr(thermal_mmio_id_table), |
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}, |
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}; |
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module_platform_driver(thermal_mmio_driver); |
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MODULE_AUTHOR("Talel Shenhar <[email protected]>"); |
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MODULE_DESCRIPTION("Thermal MMIO Driver"); |
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MODULE_LICENSE("GPL v2");
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