1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2018-2020 NXP.
7 #include <linux/firmware/imx/sci.h>
8 #include <linux/firmware/imx/types.h>
9 #include <linux/module.h>
11 #include <linux/of_device.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14 #include <linux/thermal.h>
16 #include "thermal_core.h"
18 #define IMX_SC_MISC_FUNC_GET_TEMP 13
20 static struct imx_sc_ipc *thermal_ipc_handle;
22 struct imx_sc_sensor {
23 struct thermal_zone_device *tzd;
30 } __packed __aligned(4);
32 struct resp_get_temp {
35 } __packed __aligned(4);
37 struct imx_sc_msg_misc_get_temp {
38 struct imx_sc_rpc_msg hdr;
40 struct req_get_temp req;
41 struct resp_get_temp resp;
43 } __packed __aligned(4);
45 static int imx_sc_thermal_get_temp(void *data, int *temp)
47 struct imx_sc_msg_misc_get_temp msg;
48 struct imx_sc_rpc_msg *hdr = &msg.hdr;
49 struct imx_sc_sensor *sensor = data;
52 msg.data.req.resource_id = sensor->resource_id;
53 msg.data.req.type = IMX_SC_C_TEMP;
55 hdr->ver = IMX_SC_RPC_VERSION;
56 hdr->svc = IMX_SC_RPC_SVC_MISC;
57 hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
60 ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
62 dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
63 sensor->resource_id, ret);
67 *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
72 static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
73 .get_temp = imx_sc_thermal_get_temp,
76 static int imx_sc_thermal_probe(struct platform_device *pdev)
78 struct device_node *np, *child, *sensor_np;
79 struct imx_sc_sensor *sensor;
82 ret = imx_scu_get_handle(&thermal_ipc_handle);
86 np = of_find_node_by_name(NULL, "thermal-zones");
90 sensor_np = of_node_get(pdev->dev.of_node);
92 for_each_available_child_of_node(np, child) {
93 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
95 of_node_put(sensor_np);
99 ret = thermal_zone_of_get_sensor_id(child,
101 &sensor->resource_id);
104 "failed to get valid sensor resource id: %d\n",
109 sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
112 &imx_sc_thermal_ops);
113 if (IS_ERR(sensor->tzd)) {
114 dev_err(&pdev->dev, "failed to register thermal zone\n");
115 ret = PTR_ERR(sensor->tzd);
120 of_node_put(sensor_np);
125 static int imx_sc_thermal_remove(struct platform_device *pdev)
130 static const struct of_device_id imx_sc_thermal_table[] = {
131 { .compatible = "fsl,imx-sc-thermal", },
134 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
136 static struct platform_driver imx_sc_thermal_driver = {
137 .probe = imx_sc_thermal_probe,
138 .remove = imx_sc_thermal_remove,
140 .name = "imx-sc-thermal",
141 .of_match_table = imx_sc_thermal_table,
144 module_platform_driver(imx_sc_thermal_driver);
146 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
147 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
148 MODULE_LICENSE("GPL v2");