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28#include <linux/hwmon.h>
29#include <linux/thermal.h>
30#include <linux/slab.h>
31#include <linux/err.h>
32#include "thermal_hwmon.h"
33
34
35
36struct thermal_hwmon_device {
37 char type[THERMAL_NAME_LENGTH];
38 struct device *device;
39 int count;
40 struct list_head tz_list;
41 struct list_head node;
42};
43
44struct thermal_hwmon_attr {
45 struct device_attribute attr;
46 char name[16];
47};
48
49
50struct thermal_hwmon_temp {
51 struct list_head hwmon_node;
52 struct thermal_zone_device *tz;
53 struct thermal_hwmon_attr temp_input;
54 struct thermal_hwmon_attr temp_crit;
55};
56
57static LIST_HEAD(thermal_hwmon_list);
58
59static DEFINE_MUTEX(thermal_hwmon_list_lock);
60
61static ssize_t
62name_show(struct device *dev, struct device_attribute *attr, char *buf)
63{
64 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
65 return sprintf(buf, "%s\n", hwmon->type);
66}
67static DEVICE_ATTR_RO(name);
68
69static ssize_t
70temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
71{
72 int temperature;
73 int ret;
74 struct thermal_hwmon_attr *hwmon_attr
75 = container_of(attr, struct thermal_hwmon_attr, attr);
76 struct thermal_hwmon_temp *temp
77 = container_of(hwmon_attr, struct thermal_hwmon_temp,
78 temp_input);
79 struct thermal_zone_device *tz = temp->tz;
80
81 ret = thermal_zone_get_temp(tz, &temperature);
82
83 if (ret)
84 return ret;
85
86 return sprintf(buf, "%d\n", temperature);
87}
88
89static ssize_t
90temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
91{
92 struct thermal_hwmon_attr *hwmon_attr
93 = container_of(attr, struct thermal_hwmon_attr, attr);
94 struct thermal_hwmon_temp *temp
95 = container_of(hwmon_attr, struct thermal_hwmon_temp,
96 temp_crit);
97 struct thermal_zone_device *tz = temp->tz;
98 int temperature;
99 int ret;
100
101 ret = tz->ops->get_crit_temp(tz, &temperature);
102 if (ret)
103 return ret;
104
105 return sprintf(buf, "%d\n", temperature);
106}
107
108
109static struct thermal_hwmon_device *
110thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
111{
112 struct thermal_hwmon_device *hwmon;
113
114 mutex_lock(&thermal_hwmon_list_lock);
115 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
116 if (!strcmp(hwmon->type, tz->type)) {
117 mutex_unlock(&thermal_hwmon_list_lock);
118 return hwmon;
119 }
120 mutex_unlock(&thermal_hwmon_list_lock);
121
122 return NULL;
123}
124
125
126static struct thermal_hwmon_temp *
127thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
128 const struct thermal_zone_device *tz)
129{
130 struct thermal_hwmon_temp *temp;
131
132 mutex_lock(&thermal_hwmon_list_lock);
133 list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
134 if (temp->tz == tz) {
135 mutex_unlock(&thermal_hwmon_list_lock);
136 return temp;
137 }
138 mutex_unlock(&thermal_hwmon_list_lock);
139
140 return NULL;
141}
142
143static bool thermal_zone_crit_temp_valid(struct thermal_zone_device *tz)
144{
145 int temp;
146 return tz->ops->get_crit_temp && !tz->ops->get_crit_temp(tz, &temp);
147}
148
149int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
150{
151 struct thermal_hwmon_device *hwmon;
152 struct thermal_hwmon_temp *temp;
153 int new_hwmon_device = 1;
154 int result;
155
156 hwmon = thermal_hwmon_lookup_by_type(tz);
157 if (hwmon) {
158 new_hwmon_device = 0;
159 goto register_sys_interface;
160 }
161
162 hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
163 if (!hwmon)
164 return -ENOMEM;
165
166 INIT_LIST_HEAD(&hwmon->tz_list);
167 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
168 hwmon->device = hwmon_device_register(NULL);
169 if (IS_ERR(hwmon->device)) {
170 result = PTR_ERR(hwmon->device);
171 goto free_mem;
172 }
173 dev_set_drvdata(hwmon->device, hwmon);
174 result = device_create_file(hwmon->device, &dev_attr_name);
175 if (result)
176 goto free_mem;
177
178 register_sys_interface:
179 temp = kzalloc(sizeof(*temp), GFP_KERNEL);
180 if (!temp) {
181 result = -ENOMEM;
182 goto unregister_name;
183 }
184
185 temp->tz = tz;
186 hwmon->count++;
187
188 snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
189 "temp%d_input", hwmon->count);
190 temp->temp_input.attr.attr.name = temp->temp_input.name;
191 temp->temp_input.attr.attr.mode = 0444;
192 temp->temp_input.attr.show = temp_input_show;
193 sysfs_attr_init(&temp->temp_input.attr.attr);
194 result = device_create_file(hwmon->device, &temp->temp_input.attr);
195 if (result)
196 goto free_temp_mem;
197
198 if (thermal_zone_crit_temp_valid(tz)) {
199 snprintf(temp->temp_crit.name,
200 sizeof(temp->temp_crit.name),
201 "temp%d_crit", hwmon->count);
202 temp->temp_crit.attr.attr.name = temp->temp_crit.name;
203 temp->temp_crit.attr.attr.mode = 0444;
204 temp->temp_crit.attr.show = temp_crit_show;
205 sysfs_attr_init(&temp->temp_crit.attr.attr);
206 result = device_create_file(hwmon->device,
207 &temp->temp_crit.attr);
208 if (result)
209 goto unregister_input;
210 }
211
212 mutex_lock(&thermal_hwmon_list_lock);
213 if (new_hwmon_device)
214 list_add_tail(&hwmon->node, &thermal_hwmon_list);
215 list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
216 mutex_unlock(&thermal_hwmon_list_lock);
217
218 return 0;
219
220 unregister_input:
221 device_remove_file(hwmon->device, &temp->temp_input.attr);
222 free_temp_mem:
223 kfree(temp);
224 unregister_name:
225 if (new_hwmon_device) {
226 device_remove_file(hwmon->device, &dev_attr_name);
227 hwmon_device_unregister(hwmon->device);
228 }
229 free_mem:
230 if (new_hwmon_device)
231 kfree(hwmon);
232
233 return result;
234}
235EXPORT_SYMBOL_GPL(thermal_add_hwmon_sysfs);
236
237void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
238{
239 struct thermal_hwmon_device *hwmon;
240 struct thermal_hwmon_temp *temp;
241
242 hwmon = thermal_hwmon_lookup_by_type(tz);
243 if (unlikely(!hwmon)) {
244
245 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
246 return;
247 }
248
249 temp = thermal_hwmon_lookup_temp(hwmon, tz);
250 if (unlikely(!temp)) {
251
252 dev_dbg(&tz->device, "temperature input lookup failed!\n");
253 return;
254 }
255
256 device_remove_file(hwmon->device, &temp->temp_input.attr);
257 if (thermal_zone_crit_temp_valid(tz))
258 device_remove_file(hwmon->device, &temp->temp_crit.attr);
259
260 mutex_lock(&thermal_hwmon_list_lock);
261 list_del(&temp->hwmon_node);
262 kfree(temp);
263 if (!list_empty(&hwmon->tz_list)) {
264 mutex_unlock(&thermal_hwmon_list_lock);
265 return;
266 }
267 list_del(&hwmon->node);
268 mutex_unlock(&thermal_hwmon_list_lock);
269
270 device_remove_file(hwmon->device, &dev_attr_name);
271 hwmon_device_unregister(hwmon->device);
272 kfree(hwmon);
273}
274EXPORT_SYMBOL_GPL(thermal_remove_hwmon_sysfs);
275
