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