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_hwmon.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(struct thermal_zone_device *tz, 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 = thermal_zone_device_priv(tz);
  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                 return ret;
  63
  64         *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
  65
  66         return 0;
  67 }
  68
  69 static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
  70         .get_temp = imx_sc_thermal_get_temp,
  71 };
  72
  73 static int imx_sc_thermal_probe(struct platform_device *pdev)
  74 {
  75         struct imx_sc_sensor *sensor;
  76         const int *resource_id;
  77         int i, ret;
  78
  79         ret = imx_scu_get_handle(&thermal_ipc_handle);
  80         if (ret)
  81                 return ret;
  82
  83         resource_id = of_device_get_match_data(&pdev->dev);
  84         if (!resource_id)
  85                 return -EINVAL;
  86
  87         for (i = 0; resource_id[i] >= 0; i++) {
  88
  89                 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
  90                 if (!sensor)
  91                         return -ENOMEM;
  92
  93                 sensor->resource_id = resource_id[i];
  94
  95                 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
  96                                                             sensor, &imx_sc_thermal_ops);
  97                 if (IS_ERR(sensor->tzd)) {
  98                         /*
  99                          * Save the error value before freeing the
 100                          * sensor pointer, otherwise we endup with a
 101                          * use-after-free error
 102                          */
 103                         ret = PTR_ERR(sensor->tzd);
 104
 105                         devm_kfree(&pdev->dev, sensor);
 106
 107                         /*
 108                          * The thermal framework notifies us there is
 109                          * no thermal zone description for such a
 110                          * sensor id
 111                          */
 112                         if (ret == -ENODEV)
 113                                 continue;
 114
 115                         dev_err(&pdev->dev, "failed to register thermal zone\n");
 116                         return ret;
 117                 }
 118
 119                 if (devm_thermal_add_hwmon_sysfs(&pdev->dev, sensor->tzd))
 120                         dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
 121         }
 122
 123         return 0;
 124 }
 125
 126 static const int imx_sc_sensors[] = {
 127         IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0,
 128         IMX_SC_R_AP_0, IMX_SC_R_AP_1,
 129         IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0,
 130         IMX_SC_R_DRC_0, -1 };
 131
 132 static const struct of_device_id imx_sc_thermal_table[] = {
 133         { .compatible = "fsl,imx-sc-thermal", .data =  imx_sc_sensors },
 134         {}
 135 };
 136 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
 137
 138 static struct platform_driver imx_sc_thermal_driver = {
 139                 .probe = imx_sc_thermal_probe,
 140                 .driver = {
 141                         .name = "imx-sc-thermal",
 142                         .of_match_table = imx_sc_thermal_table,
 143                 },
 144 };
 145 module_platform_driver(imx_sc_thermal_driver);
 146
 147 MODULE_AUTHOR("Anson Huang <[email protected]>");
 148 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
 149 MODULE_LICENSE("GPL v2");