drivers/thermal/imx_sc_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2018-2020 NXP.
   4  */
   5
   6 #include <linux/err.h>
   7 #include <linux/firmware/imx/sci.h>
   8 #include <linux/firmware/imx/types.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/of_device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/slab.h>
  14 #include <linux/thermal.h>
  15
  16 #include "thermal_core.h"
  17
  18 #define IMX_SC_MISC_FUNC_GET_TEMP       13
  19
  20 static struct imx_sc_ipc *thermal_ipc_handle;
  21
  22 struct imx_sc_sensor {
  23         struct thermal_zone_device *tzd;
  24         u32 resource_id;
  25 };
  26
  27 struct req_get_temp {
  28         u16 resource_id;
  29         u8 type;
  30 } __packed __aligned(4);
  31
  32 struct resp_get_temp {
  33         s16 celsius;
  34         s8 tenths;
  35 } __packed __aligned(4);
  36
  37 struct imx_sc_msg_misc_get_temp {
  38         struct imx_sc_rpc_msg hdr;
  39         union {
  40                 struct req_get_temp req;
  41                 struct resp_get_temp resp;
  42         } data;
  43 } __packed __aligned(4);
  44
  45 static int imx_sc_thermal_get_temp(void *data, int *temp)
  46 {
  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;
  50         int ret;
  51
  52         msg.data.req.resource_id = sensor->resource_id;
  53         msg.data.req.type = IMX_SC_C_TEMP;
  54
  55         hdr->ver = IMX_SC_RPC_VERSION;
  56         hdr->svc = IMX_SC_RPC_SVC_MISC;
  57         hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
  58         hdr->size = 2;
  59
  60         ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
  61         if (ret) {
  62                 dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
  63                         sensor->resource_id, ret);
  64                 return ret;
  65         }
  66
  67         *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
  68
  69         return 0;
  70 }
  71
  72 static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
  73         .get_temp = imx_sc_thermal_get_temp,
  74 };
  75
  76 static int imx_sc_thermal_probe(struct platform_device *pdev)
  77 {
  78         struct device_node *np, *child, *sensor_np;
  79         struct imx_sc_sensor *sensor;
  80         int ret;
  81
  82         ret = imx_scu_get_handle(&thermal_ipc_handle);
  83         if (ret)
  84                 return ret;
  85
  86         np = of_find_node_by_name(NULL, "thermal-zones");
  87         if (!np)
  88                 return -ENODEV;
  89
  90         sensor_np = of_node_get(pdev->dev.of_node);
  91
  92         for_each_available_child_of_node(np, child) {
  93                 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
  94                 if (!sensor) {
  95                         of_node_put(sensor_np);
  96                         return -ENOMEM;
  97                 }
  98
  99                 ret = thermal_zone_of_get_sensor_id(child,
 100                                                     sensor_np,
 101                                                     &sensor->resource_id);
 102                 if (ret < 0) {
 103                         dev_err(&pdev->dev,
 104                                 "failed to get valid sensor resource id: %d\n",
 105                                 ret);
 106                         break;
 107                 }
 108
 109                 sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
 110                                                                    sensor->resource_id,
 111                                                                    sensor,
 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);
 116                         break;
 117                 }
 118         }
 119
 120         of_node_put(sensor_np);
 121
 122         return ret;
 123 }
 124
 125 static int imx_sc_thermal_remove(struct platform_device *pdev)
 126 {
 127         return 0;
 128 }
 129
 130 static const struct of_device_id imx_sc_thermal_table[] = {
 131         { .compatible = "fsl,imx-sc-thermal", },
 132         {}
 133 };
 134 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
 135
 136 static struct platform_driver imx_sc_thermal_driver = {
 137                 .probe = imx_sc_thermal_probe,
 138                 .remove = imx_sc_thermal_remove,
 139                 .driver = {
 140                         .name = "imx-sc-thermal",
 141                         .of_match_table = imx_sc_thermal_table,
 142                 },
 143 };
 144 module_platform_driver(imx_sc_thermal_driver);
 145
 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");