mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
dd89d82e75
The platform_get_resource() function doesn't return error pointers, it returns NULL. The way this is normally done, is that we pass the NULL resource to devm_ioremap_resource() and then check for errors from that. See the comment in front of devm_ioremap_resource() for more details. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Talel Shenhar <talel@amazon.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/thermal.h>
|
|
|
|
struct thermal_mmio {
|
|
void __iomem *mmio_base;
|
|
u32 (*read_mmio)(void __iomem *mmio_base);
|
|
u32 mask;
|
|
int factor;
|
|
};
|
|
|
|
static u32 thermal_mmio_readb(void __iomem *mmio_base)
|
|
{
|
|
return readb(mmio_base);
|
|
}
|
|
|
|
static int thermal_mmio_get_temperature(void *private, int *temp)
|
|
{
|
|
int t;
|
|
struct thermal_mmio *sensor =
|
|
(struct thermal_mmio *)private;
|
|
|
|
t = sensor->read_mmio(sensor->mmio_base) & sensor->mask;
|
|
t *= sensor->factor;
|
|
|
|
*temp = t;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct thermal_zone_of_device_ops thermal_mmio_ops = {
|
|
.get_temp = thermal_mmio_get_temperature,
|
|
};
|
|
|
|
static int thermal_mmio_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *resource;
|
|
struct thermal_mmio *sensor;
|
|
int (*sensor_init_func)(struct platform_device *pdev,
|
|
struct thermal_mmio *sensor);
|
|
struct thermal_zone_device *thermal_zone;
|
|
int ret;
|
|
int temperature;
|
|
|
|
sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
|
|
if (!sensor)
|
|
return -ENOMEM;
|
|
|
|
resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
sensor->mmio_base = devm_ioremap_resource(&pdev->dev, resource);
|
|
if (IS_ERR(sensor->mmio_base)) {
|
|
dev_err(&pdev->dev, "failed to ioremap memory (%ld)\n",
|
|
PTR_ERR(sensor->mmio_base));
|
|
return PTR_ERR(sensor->mmio_base);
|
|
}
|
|
|
|
sensor_init_func = device_get_match_data(&pdev->dev);
|
|
if (sensor_init_func) {
|
|
ret = sensor_init_func(pdev, sensor);
|
|
if (ret) {
|
|
dev_err(&pdev->dev,
|
|
"failed to initialize sensor (%d)\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
thermal_zone = devm_thermal_zone_of_sensor_register(&pdev->dev,
|
|
0,
|
|
sensor,
|
|
&thermal_mmio_ops);
|
|
if (IS_ERR(thermal_zone)) {
|
|
dev_err(&pdev->dev,
|
|
"failed to register sensor (%ld)\n",
|
|
PTR_ERR(thermal_zone));
|
|
return PTR_ERR(thermal_zone);
|
|
}
|
|
|
|
thermal_mmio_get_temperature(sensor, &temperature);
|
|
dev_info(&pdev->dev,
|
|
"thermal mmio sensor %s registered, current temperature: %d\n",
|
|
pdev->name, temperature);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int al_thermal_init(struct platform_device *pdev,
|
|
struct thermal_mmio *sensor)
|
|
{
|
|
sensor->read_mmio = thermal_mmio_readb;
|
|
sensor->mask = 0xff;
|
|
sensor->factor = 1000;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id thermal_mmio_id_table[] = {
|
|
{ .compatible = "amazon,al-thermal", .data = al_thermal_init},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, thermal_mmio_id_table);
|
|
|
|
static struct platform_driver thermal_mmio_driver = {
|
|
.probe = thermal_mmio_probe,
|
|
.driver = {
|
|
.name = "thermal-mmio",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_match_ptr(thermal_mmio_id_table),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(thermal_mmio_driver);
|
|
|
|
MODULE_AUTHOR("Talel Shenhar <talel@amazon.com>");
|
|
MODULE_DESCRIPTION("Thermal MMIO Driver");
|
|
MODULE_LICENSE("GPL v2");
|