drivers/thermal/imx_sc_thermal.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright 2018-2020 NXP.
0004  */
0005
0006 #include <dt-bindings/firmware/imx/rsrc.h>
0007 #include <linux/err.h>
0008 #include <linux/firmware/imx/sci.h>
0009 #include <linux/module.h>
0010 #include <linux/of.h>
0011 #include <linux/of_device.h>
0012 #include <linux/platform_device.h>
0013 #include <linux/slab.h>
0014 #include <linux/thermal.h>
0015
0016 #include "thermal_core.h"
0017 #include "thermal_hwmon.h"
0018
0019 #define IMX_SC_MISC_FUNC_GET_TEMP   13
0020
0021 static struct imx_sc_ipc *thermal_ipc_handle;
0022
0023 struct imx_sc_sensor {
0024     struct thermal_zone_device *tzd;
0025     u32 resource_id;
0026 };
0027
0028 struct req_get_temp {
0029     u16 resource_id;
0030     u8 type;
0031 } __packed __aligned(4);
0032
0033 struct resp_get_temp {
0034     s16 celsius;
0035     s8 tenths;
0036 } __packed __aligned(4);
0037
0038 struct imx_sc_msg_misc_get_temp {
0039     struct imx_sc_rpc_msg hdr;
0040     union {
0041         struct req_get_temp req;
0042         struct resp_get_temp resp;
0043     } data;
0044 } __packed __aligned(4);
0045
0046 static int imx_sc_thermal_get_temp(void *data, int *temp)
0047 {
0048     struct imx_sc_msg_misc_get_temp msg;
0049     struct imx_sc_rpc_msg *hdr = &msg.hdr;
0050     struct imx_sc_sensor *sensor = data;
0051     int ret;
0052
0053     msg.data.req.resource_id = sensor->resource_id;
0054     msg.data.req.type = IMX_SC_C_TEMP;
0055
0056     hdr->ver = IMX_SC_RPC_VERSION;
0057     hdr->svc = IMX_SC_RPC_SVC_MISC;
0058     hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
0059     hdr->size = 2;
0060
0061     ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
0062     if (ret) {
0063         dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
0064             sensor->resource_id, ret);
0065         return ret;
0066     }
0067
0068     *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
0069
0070     return 0;
0071 }
0072
0073 static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
0074     .get_temp = imx_sc_thermal_get_temp,
0075 };
0076
0077 static int imx_sc_thermal_probe(struct platform_device *pdev)
0078 {
0079     struct device_node *np, *child, *sensor_np;
0080     struct imx_sc_sensor *sensor;
0081     int ret;
0082
0083     ret = imx_scu_get_handle(&thermal_ipc_handle);
0084     if (ret)
0085         return ret;
0086
0087     np = of_find_node_by_name(NULL, "thermal-zones");
0088     if (!np)
0089         return -ENODEV;
0090
0091     sensor_np = of_node_get(pdev->dev.of_node);
0092
0093     for_each_available_child_of_node(np, child) {
0094         sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
0095         if (!sensor) {
0096             of_node_put(child);
0097             ret = -ENOMEM;
0098             goto put_node;
0099         }
0100
0101         ret = thermal_zone_of_get_sensor_id(child,
0102                             sensor_np,
0103                             &sensor->resource_id);
0104         if (ret < 0) {
0105             dev_err(&pdev->dev,
0106                 "failed to get valid sensor resource id: %d\n",
0107                 ret);
0108             of_node_put(child);
0109             break;
0110         }
0111
0112         sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
0113                                    sensor->resource_id,
0114                                    sensor,
0115                                    &imx_sc_thermal_ops);
0116         if (IS_ERR(sensor->tzd)) {
0117             dev_err(&pdev->dev, "failed to register thermal zone\n");
0118             ret = PTR_ERR(sensor->tzd);
0119             of_node_put(child);
0120             break;
0121         }
0122
0123         if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
0124             dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
0125     }
0126
0127 put_node:
0128     of_node_put(sensor_np);
0129     of_node_put(np);
0130
0131     return ret;
0132 }
0133
0134 static int imx_sc_thermal_remove(struct platform_device *pdev)
0135 {
0136     return 0;
0137 }
0138
0139 static const struct of_device_id imx_sc_thermal_table[] = {
0140     { .compatible = "fsl,imx-sc-thermal", },
0141     {}
0142 };
0143 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
0144
0145 static struct platform_driver imx_sc_thermal_driver = {
0146         .probe = imx_sc_thermal_probe,
0147         .remove = imx_sc_thermal_remove,
0148         .driver = {
0149             .name = "imx-sc-thermal",
0150             .of_match_table = imx_sc_thermal_table,
0151         },
0152 };
0153 module_platform_driver(imx_sc_thermal_driver);
0154
0155 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
0156 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
0157 MODULE_LICENSE("GPL v2");