| // 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" |
| |
| #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(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); |
| 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); |
| break; |
| } |
| } |
| |
| 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"); |