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(struct thermal_zone_device *tz, 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 = tz->devdata;
  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_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 imx_sc_sensor *sensor;
  80         const int *resource_id;
  81         int i, ret;
  82
  83         ret = imx_scu_get_handle(&thermal_ipc_handle);
  84         if (ret)
  85                 return ret;
  86
  87         resource_id = of_device_get_match_data(&pdev->dev);
  88         if (!resource_id)
  89                 return -EINVAL;
  90
  91         for (i = 0; resource_id[i] > 0; i++) {
  92
  93                 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
  94                 if (!sensor)
  95                         return -ENOMEM;
  96
  97                 sensor->resource_id = resource_id[i];
  98
  99                 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
 100                                                             sensor, &imx_sc_thermal_ops);
 101                 if (IS_ERR(sensor->tzd)) {
 102                         /*
 103                          * Save the error value before freeing the
 104                          * sensor pointer, otherwise we endup with a
 105                          * use-after-free error
 106                          */
 107                         ret = PTR_ERR(sensor->tzd);
 108
 109                         devm_kfree(&pdev->dev, sensor);
 110
 111                         /*
 112                          * The thermal framework notifies us there is
 113                          * no thermal zone description for such a
 114                          * sensor id
 115                          */
 116                         if (ret == -ENODEV)
 117                                 continue;
 118
 119                         dev_err(&pdev->dev, "failed to register thermal zone\n");
 120                         return ret;
 121                 }
 122
 123                 if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
 124                         dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int imx_sc_thermal_remove(struct platform_device *pdev)
 131 {
 132         return 0;
 133 }
 134
 135 static int imx_sc_sensors[] = { IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, -1 };
 136
 137 static const struct of_device_id imx_sc_thermal_table[] = {
 138         { .compatible = "fsl,imx-sc-thermal", .data =  imx_sc_sensors },
 139         {}
 140 };
 141 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
 142
 143 static struct platform_driver imx_sc_thermal_driver = {
 144                 .probe = imx_sc_thermal_probe,
 145                 .remove = imx_sc_thermal_remove,
 146                 .driver = {
 147                         .name = "imx-sc-thermal",
 148                         .of_match_table = imx_sc_thermal_table,
 149                 },
 150 };
 151 module_platform_driver(imx_sc_thermal_driver);
 152
 153 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
 154 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
 155 MODULE_LICENSE("GPL v2");