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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(void *data, int *temp)
- {
- struct imx_sc_msg_misc_get_temp msg;
- struct imx_sc_rpc_msg *hdr = &msg.hdr;
- struct imx_sc_sensor *sensor = data;
- 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_of_device_ops imx_sc_thermal_ops = {
- .get_temp = imx_sc_thermal_get_temp,
- };
- static int imx_sc_thermal_probe(struct platform_device *pdev)
- {
- struct device_node *np, *child, *sensor_np;
- struct imx_sc_sensor *sensor;
- int ret;
- ret = imx_scu_get_handle(&thermal_ipc_handle);
- if (ret)
- return ret;
- np = of_find_node_by_name(NULL, "thermal-zones");
- if (!np)
- return -ENODEV;
- sensor_np = of_node_get(pdev->dev.of_node);
- for_each_available_child_of_node(np, child) {
- sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
- if (!sensor) {
- of_node_put(child);
- of_node_put(sensor_np);
- return -ENOMEM;
- }
- ret = thermal_zone_of_get_sensor_id(child,
- sensor_np,
- &sensor->resource_id);
- if (ret < 0) {
- dev_err(&pdev->dev,
- "failed to get valid sensor resource id: %d\n",
- ret);
- of_node_put(child);
- break;
- }
- sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
- sensor->resource_id,
- sensor,
- &imx_sc_thermal_ops);
- if (IS_ERR(sensor->tzd)) {
- dev_err(&pdev->dev, "failed to register thermal zone\n");
- ret = PTR_ERR(sensor->tzd);
- of_node_put(child);
- break;
- }
- if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
- dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
- }
- of_node_put(sensor_np);
- return ret;
- }
- static int imx_sc_thermal_remove(struct platform_device *pdev)
- {
- return 0;
- }
- static const struct of_device_id imx_sc_thermal_table[] = {
- { .compatible = "fsl,imx-sc-thermal", },
- {}
- };
- 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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