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