linux/drivers/thermal/thermal_mmio.c
Daniel Lezcano 5f68d0785e thermal/core: Use the thermal zone 'devdata' accessor in thermal located drivers
The thermal zone device structure is exposed to the different drivers
and obviously they access the internals while that should be
restricted to the core thermal code.

In order to self-encapsulate the thermal core code, we need to prevent
the drivers accessing directly the thermal zone structure and provide
accessor functions to deal with.

Use the devdata accessor introduced in the previous patch.

No functional changes intended.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> #R-Car
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> #MediaTek auxadc and lvts
Reviewed-by: Balsam CHIHI <bchihi@baylibre.com> #Mediatek lvts
Reviewed-by: Adam Ward <DLG-Adam.Ward.opensource@dm.renesas.com> #da9062
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>  #spread
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com> #sun8i_thermal
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com> #Broadcom
Reviewed-by: Dhruva Gole <d-gole@ti.com> # K3 bandgap
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Heiko Stuebner <heiko@sntech.de> #rockchip
Reviewed-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> #uniphier
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2023-03-03 20:45:02 +01:00

116 lines
2.7 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(struct thermal_zone_device *tz, int *temp)
{
int t;
struct thermal_mmio *sensor = thermal_zone_device_priv(tz);
t = sensor->read_mmio(sensor->mmio_base) & sensor->mask;
t *= sensor->factor;
*temp = t;
return 0;
}
static const struct thermal_zone_device_ops thermal_mmio_ops = {
.get_temp = thermal_mmio_get_temperature,
};
static int thermal_mmio_probe(struct platform_device *pdev)
{
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;
sensor->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
if (IS_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_of_zone_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(thermal_zone, &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",
.of_match_table = 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");