drivers/thermal/imx_sc_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2018-2020 NXP.
   4  */
   5
   6 #include <dt-bindings/firmware/imx/rsrc.h>
   7 #include <linux/err.h>
   8 #include <linux/firmware/imx/sci.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 #include "thermal_hwmon.h"
  18
  19 #define IMX_SC_MISC_FUNC_GET_TEMP       13
  20
  21 static struct imx_sc_ipc *thermal_ipc_handle;
  22
  23 struct imx_sc_sensor {
  24         struct thermal_zone_device *tzd;
  25         u32 resource_id;
  26 };
  27
  28 struct req_get_temp {
  29         u16 resource_id;
  30         u8 type;
  31 } __packed __aligned(4);
  32
  33 struct resp_get_temp {
  34         s16 celsius;
  35         s8 tenths;
  36 } __packed __aligned(4);
  37
  38 struct imx_sc_msg_misc_get_temp {
  39         struct imx_sc_rpc_msg hdr;
  40         union {
  41                 struct req_get_temp req;
  42                 struct resp_get_temp resp;
  43         } data;
  44 } __packed __aligned(4);
  45
  46 static int imx_sc_thermal_get_temp(void *data, int *temp)
  47 {
  48         struct imx_sc_msg_misc_get_temp msg;
  49         struct imx_sc_rpc_msg *hdr = &msg.hdr;
  50         struct imx_sc_sensor *sensor = data;
  51         int ret;
  52
  53         msg.data.req.resource_id = sensor->resource_id;
  54         msg.data.req.type = IMX_SC_C_TEMP;
  55
  56         hdr->ver = IMX_SC_RPC_VERSION;
  57         hdr->svc = IMX_SC_RPC_SVC_MISC;
  58         hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
  59         hdr->size = 2;
  60
  61         ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
  62         if (ret) {
  63                 dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
  64                         sensor->resource_id, ret);
  65                 return ret;
  66         }
  67
  68         *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
  69
  70         return 0;
  71 }
  72
  73 static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
  74         .get_temp = imx_sc_thermal_get_temp,
  75 };
  76
  77 static int imx_sc_thermal_probe(struct platform_device *pdev)
  78 {
  79         struct device_node *np, *child, *sensor_np;
  80         struct imx_sc_sensor *sensor;
  81         int ret;
  82
  83         ret = imx_scu_get_handle(&thermal_ipc_handle);
  84         if (ret)
  85                 return ret;
  86
  87         np = of_find_node_by_name(NULL, "thermal-zones");
  88         if (!np)
  89                 return -ENODEV;
  90
  91         sensor_np = of_node_get(pdev->dev.of_node);
  92
  93         for_each_available_child_of_node(np, child) {
  94                 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
  95                 if (!sensor) {
  96                         of_node_put(sensor_np);
  97                         return -ENOMEM;
  98                 }
  99
 100                 ret = thermal_zone_of_get_sensor_id(child,
 101                                                     sensor_np,
 102                                                     &sensor->resource_id);
 103                 if (ret < 0) {
 104                         dev_err(&pdev->dev,
 105                                 "failed to get valid sensor resource id: %d\n",
 106                                 ret);
 107                         break;
 108                 }
 109
 110                 sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
 111                                                                    sensor->resource_id,
 112                                                                    sensor,
 113                                                                    &imx_sc_thermal_ops);
 114                 if (IS_ERR(sensor->tzd)) {
 115                         dev_err(&pdev->dev, "failed to register thermal zone\n");
 116                         ret = PTR_ERR(sensor->tzd);
 117                         break;
 118                 }
 119
 120                 if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
 121                         dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
 122         }
 123
 124         of_node_put(sensor_np);
 125
 126         return ret;
 127 }
 128
 129 static int imx_sc_thermal_remove(struct platform_device *pdev)
 130 {
 131         return 0;
 132 }
 133
 134 static const struct of_device_id imx_sc_thermal_table[] = {
 135         { .compatible = "fsl,imx-sc-thermal", },
 136         {}
 137 };
 138 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
 139
 140 static struct platform_driver imx_sc_thermal_driver = {
 141                 .probe = imx_sc_thermal_probe,
 142                 .remove = imx_sc_thermal_remove,
 143                 .driver = {
 144                         .name = "imx-sc-thermal",
 145                         .of_match_table = imx_sc_thermal_table,
 146                 },
 147 };
 148 module_platform_driver(imx_sc_thermal_driver);
 149
 150 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
 151 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
 152 MODULE_LICENSE("GPL v2");