arch/powerpc/platforms/powernv/opal-sensor.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * PowerNV sensor code
   4  *
   5  * Copyright (C) 2013 IBM
   6  */
   7
   8 #include <linux/delay.h>
   9 #include <linux/of.h>
  10 #include <linux/of_platform.h>
  11 #include <linux/platform_device.h>
  12 #include <asm/opal.h>
  13 #include <asm/machdep.h>
  14
  15 /*
  16  * This will return sensor information to driver based on the requested sensor
  17  * handle. A handle is an opaque id for the powernv, read by the driver from the
  18  * device tree..
  19  */
  20 int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
  21 {
  22         int ret, token;
  23         struct opal_msg msg;
  24         __be32 data;
  25
  26         token = opal_async_get_token_interruptible();
  27         if (token < 0)
  28                 return token;
  29
  30         ret = opal_sensor_read(sensor_hndl, token, &data);
  31         switch (ret) {
  32         case OPAL_ASYNC_COMPLETION:
  33                 ret = opal_async_wait_response(token, &msg);
  34                 if (ret) {
  35                         pr_err("%s: Failed to wait for the async response, %d\n",
  36                                __func__, ret);
  37                         goto out;
  38                 }
  39
  40                 ret = opal_error_code(opal_get_async_rc(msg));
  41                 *sensor_data = be32_to_cpu(data);
  42                 break;
  43
  44         case OPAL_SUCCESS:
  45                 ret = 0;
  46                 *sensor_data = be32_to_cpu(data);
  47                 break;
  48
  49         case OPAL_WRONG_STATE:
  50                 ret = -EIO;
  51                 break;
  52
  53         default:
  54                 ret = opal_error_code(ret);
  55                 break;
  56         }
  57
  58 out:
  59         opal_async_release_token(token);
  60         return ret;
  61 }
  62 EXPORT_SYMBOL_GPL(opal_get_sensor_data);
  63
  64 int opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data)
  65 {
  66         int ret, token;
  67         struct opal_msg msg;
  68         __be64 data;
  69
  70         if (!opal_check_token(OPAL_SENSOR_READ_U64)) {
  71                 u32 sdata;
  72
  73                 ret = opal_get_sensor_data(sensor_hndl, &sdata);
  74                 if (!ret)
  75                         *sensor_data = sdata;
  76                 return ret;
  77         }
  78
  79         token = opal_async_get_token_interruptible();
  80         if (token < 0)
  81                 return token;
  82
  83         ret = opal_sensor_read_u64(sensor_hndl, token, &data);
  84         switch (ret) {
  85         case OPAL_ASYNC_COMPLETION:
  86                 ret = opal_async_wait_response(token, &msg);
  87                 if (ret) {
  88                         pr_err("%s: Failed to wait for the async response, %d\n",
  89                                __func__, ret);
  90                         goto out_token;
  91                 }
  92
  93                 ret = opal_error_code(opal_get_async_rc(msg));
  94                 *sensor_data = be64_to_cpu(data);
  95                 break;
  96
  97         case OPAL_SUCCESS:
  98                 ret = 0;
  99                 *sensor_data = be64_to_cpu(data);
 100                 break;
 101
 102         case OPAL_WRONG_STATE:
 103                 ret = -EIO;
 104                 break;
 105
 106         default:
 107                 ret = opal_error_code(ret);
 108                 break;
 109         }
 110
 111 out_token:
 112         opal_async_release_token(token);
 113         return ret;
 114 }
 115 EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64);
 116
 117 int __init opal_sensor_init(void)
 118 {
 119         struct platform_device *pdev;
 120         struct device_node *sensor;
 121
 122         sensor = of_find_node_by_path("/ibm,opal/sensors");
 123         if (!sensor) {
 124                 pr_err("Opal node 'sensors' not found\n");
 125                 return -ENODEV;
 126         }
 127
 128         pdev = of_platform_device_create(sensor, "opal-sensor", NULL);
 129         of_node_put(sensor);
 130
 131         return PTR_ERR_OR_ZERO(pdev);
 132 }