drivers/thermal/intel/int340x_thermal/processor_thermal_wt_req.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * processor thermal device for Workload type hints
   4  * update from user space
   5  *
   6  * Copyright (c) 2020-2023, Intel Corporation.
   7  */
   8
   9 #include <linux/pci.h>
  10 #include "processor_thermal_device.h"
  11
  12 /* List of workload types */
  13 static const char * const workload_types[] = {
  14         "none",
  15         "idle",
  16         "semi_active",
  17         "bursty",
  18         "sustained",
  19         "battery_life",
  20         NULL
  21 };
  22
  23 static ssize_t workload_available_types_show(struct device *dev,
  24                                              struct device_attribute *attr,
  25                                              char *buf)
  26 {
  27         int i = 0;
  28         int ret = 0;
  29
  30         while (workload_types[i] != NULL)
  31                 ret += sprintf(&buf[ret], "%s ", workload_types[i++]);
  32
  33         ret += sprintf(&buf[ret], "\n");
  34
  35         return ret;
  36 }
  37
  38 static DEVICE_ATTR_RO(workload_available_types);
  39
  40 static ssize_t workload_type_store(struct device *dev,
  41                                    struct device_attribute *attr,
  42                                    const char *buf, size_t count)
  43 {
  44         struct pci_dev *pdev = to_pci_dev(dev);
  45         char str_preference[15];
  46         u32 data = 0;
  47         ssize_t ret;
  48
  49         ret = sscanf(buf, "%14s", str_preference);
  50         if (ret != 1)
  51                 return -EINVAL;
  52
  53         ret = match_string(workload_types, -1, str_preference);
  54         if (ret < 0)
  55                 return ret;
  56
  57         ret &= 0xff;
  58
  59         if (ret)
  60                 data = BIT(MBOX_DATA_BIT_VALID) | BIT(MBOX_DATA_BIT_AC_DC);
  61
  62         data |= ret;
  63
  64         ret = processor_thermal_send_mbox_write_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_WRITE, data);
  65         if (ret)
  66                 return false;
  67
  68         return count;
  69 }
  70
  71 static ssize_t workload_type_show(struct device *dev,
  72                                   struct device_attribute *attr,
  73                                   char *buf)
  74 {
  75         struct pci_dev *pdev = to_pci_dev(dev);
  76         u64 cmd_resp;
  77         int ret;
  78
  79         ret = processor_thermal_send_mbox_read_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_READ, &cmd_resp);
  80         if (ret)
  81                 return false;
  82
  83         cmd_resp &= 0xff;
  84
  85         if (cmd_resp > ARRAY_SIZE(workload_types) - 1)
  86                 return -EINVAL;
  87
  88         return sprintf(buf, "%s\n", workload_types[cmd_resp]);
  89 }
  90
  91 static DEVICE_ATTR_RW(workload_type);
  92
  93 static struct attribute *workload_req_attrs[] = {
  94         &dev_attr_workload_available_types.attr,
  95         &dev_attr_workload_type.attr,
  96         NULL
  97 };
  98
  99 static const struct attribute_group workload_req_attribute_group = {
 100         .attrs = workload_req_attrs,
 101         .name = "workload_request"
 102 };
 103
 104 static bool workload_req_created;
 105
 106 int proc_thermal_wt_req_add(struct pci_dev *pdev, struct proc_thermal_device *proc_priv)
 107 {
 108         u64 cmd_resp;
 109         int ret;
 110
 111         /* Check if there is a mailbox support, if fails return success */
 112         ret = processor_thermal_send_mbox_read_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_READ, &cmd_resp);
 113         if (ret)
 114                 return 0;
 115
 116         ret = sysfs_create_group(&pdev->dev.kobj, &workload_req_attribute_group);
 117         if (ret)
 118                 return ret;
 119
 120         workload_req_created = true;
 121
 122         return 0;
 123 }
 124 EXPORT_SYMBOL_GPL(proc_thermal_wt_req_add);
 125
 126 void proc_thermal_wt_req_remove(struct pci_dev *pdev)
 127 {
 128         if (workload_req_created)
 129                 sysfs_remove_group(&pdev->dev.kobj, &workload_req_attribute_group);
 130
 131         workload_req_created = false;
 132 }
 133 EXPORT_SYMBOL_GPL(proc_thermal_wt_req_remove);
 134
 135 MODULE_IMPORT_NS("INT340X_THERMAL");
 136 MODULE_LICENSE("GPL");
 137 MODULE_DESCRIPTION("Processor Thermal Work Load type request Interface");