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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018-2020 NXP.
*/
#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/err.h>
#include <linux/firmware/imx/sci.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/thermal.h>
#include "thermal_core.h"
#include "thermal_hwmon.h"
#define IMX_SC_MISC_FUNC_GET_TEMP 13
static struct imx_sc_ipc *thermal_ipc_handle;
struct imx_sc_sensor {
struct thermal_zone_device *tzd;
u32 resource_id;
};
struct req_get_temp {
u16 resource_id;
u8 type;
} __packed __aligned(4);
struct resp_get_temp {
s16 celsius;
s8 tenths;
} __packed __aligned(4);
struct imx_sc_msg_misc_get_temp {
struct imx_sc_rpc_msg hdr;
union {
struct req_get_temp req;
struct resp_get_temp resp;
} data;
} __packed __aligned(4);
static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
{
struct imx_sc_msg_misc_get_temp msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
struct imx_sc_sensor *sensor = tz->devdata;
int ret;
msg.data.req.resource_id = sensor->resource_id;
msg.data.req.type = IMX_SC_C_TEMP;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_MISC;
hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
hdr->size = 2;
ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
if (ret) {
dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
sensor->resource_id, ret);
return ret;
}
*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
return 0;
}
static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
.get_temp = imx_sc_thermal_get_temp,
};
static int imx_sc_thermal_probe(struct platform_device *pdev)
{
struct imx_sc_sensor *sensor;
const int *resource_id;
int i, ret;
ret = imx_scu_get_handle(&thermal_ipc_handle);
if (ret)
return ret;
resource_id = of_device_get_match_data(&pdev->dev);
if (!resource_id)
return -EINVAL;
for (i = 0; resource_id[i] > 0; i++) {
sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
if (!sensor)
return -ENOMEM;
sensor->resource_id = resource_id[i];
sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
sensor, &imx_sc_thermal_ops);
if (IS_ERR(sensor->tzd)) {
/*
* Save the error value before freeing the
* sensor pointer, otherwise we endup with a
* use-after-free error
*/
ret = PTR_ERR(sensor->tzd);
devm_kfree(&pdev->dev, sensor);
/*
* The thermal framework notifies us there is
* no thermal zone description for such a
* sensor id
*/
if (ret == -ENODEV)
continue;
dev_err(&pdev->dev, "failed to register thermal zone\n");
return ret;
}
if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
}
return 0;
}
static int imx_sc_thermal_remove(struct platform_device *pdev)
{
return 0;
}
static int imx_sc_sensors[] = { IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, -1 };
static const struct of_device_id imx_sc_thermal_table[] = {
{ .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },
{}
};
MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
static struct platform_driver imx_sc_thermal_driver = {
.probe = imx_sc_thermal_probe,
.remove = imx_sc_thermal_remove,
.driver = {
.name = "imx-sc-thermal",
.of_match_table = imx_sc_thermal_table,
},
};
module_platform_driver(imx_sc_thermal_driver);
MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
MODULE_LICENSE("GPL v2");
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