Commit | Line | Data |
---|---|---|
4f86d3a8 LB |
1 | /* |
2 | * sysfs.c - sysfs support | |
3 | * | |
4 | * (C) 2006-2007 Shaohua Li <shaohua.li@intel.com> | |
5 | * | |
6 | * This code is licenced under the GPL. | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/cpuidle.h> | |
11 | #include <linux/sysfs.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
4f86d3a8 | 13 | #include <linux/cpu.h> |
728ce22b | 14 | #include <linux/completion.h> |
3a53396b | 15 | #include <linux/capability.h> |
8f3e9953 | 16 | #include <linux/device.h> |
728ce22b | 17 | #include <linux/kobject.h> |
4f86d3a8 LB |
18 | |
19 | #include "cpuidle.h" | |
20 | ||
21 | static unsigned int sysfs_switch; | |
22 | static int __init cpuidle_sysfs_setup(char *unused) | |
23 | { | |
24 | sysfs_switch = 1; | |
25 | return 1; | |
26 | } | |
27 | __setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup); | |
28 | ||
8a25a2fd KS |
29 | static ssize_t show_available_governors(struct device *dev, |
30 | struct device_attribute *attr, | |
66198f36 | 31 | char *buf) |
4f86d3a8 LB |
32 | { |
33 | ssize_t i = 0; | |
34 | struct cpuidle_governor *tmp; | |
35 | ||
36 | mutex_lock(&cpuidle_lock); | |
37 | list_for_each_entry(tmp, &cpuidle_governors, governor_list) { | |
f89ae89e DL |
38 | if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - |
39 | CPUIDLE_NAME_LEN - 2)) | |
4f86d3a8 LB |
40 | goto out; |
41 | i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name); | |
42 | } | |
43 | ||
44 | out: | |
45 | i+= sprintf(&buf[i], "\n"); | |
46 | mutex_unlock(&cpuidle_lock); | |
47 | return i; | |
48 | } | |
49 | ||
8a25a2fd KS |
50 | static ssize_t show_current_driver(struct device *dev, |
51 | struct device_attribute *attr, | |
66198f36 | 52 | char *buf) |
4f86d3a8 LB |
53 | { |
54 | ssize_t ret; | |
752138df | 55 | struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver(); |
4f86d3a8 LB |
56 | |
57 | spin_lock(&cpuidle_driver_lock); | |
752138df LB |
58 | if (cpuidle_driver) |
59 | ret = sprintf(buf, "%s\n", cpuidle_driver->name); | |
4f86d3a8 LB |
60 | else |
61 | ret = sprintf(buf, "none\n"); | |
62 | spin_unlock(&cpuidle_driver_lock); | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
8a25a2fd KS |
67 | static ssize_t show_current_governor(struct device *dev, |
68 | struct device_attribute *attr, | |
66198f36 | 69 | char *buf) |
4f86d3a8 LB |
70 | { |
71 | ssize_t ret; | |
72 | ||
73 | mutex_lock(&cpuidle_lock); | |
74 | if (cpuidle_curr_governor) | |
75 | ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name); | |
76 | else | |
77 | ret = sprintf(buf, "none\n"); | |
78 | mutex_unlock(&cpuidle_lock); | |
79 | ||
80 | return ret; | |
81 | } | |
82 | ||
8a25a2fd KS |
83 | static ssize_t store_current_governor(struct device *dev, |
84 | struct device_attribute *attr, | |
66198f36 | 85 | const char *buf, size_t count) |
4f86d3a8 LB |
86 | { |
87 | char gov_name[CPUIDLE_NAME_LEN]; | |
88 | int ret = -EINVAL; | |
89 | size_t len = count; | |
90 | struct cpuidle_governor *gov; | |
91 | ||
92 | if (!len || len >= sizeof(gov_name)) | |
93 | return -EINVAL; | |
94 | ||
95 | memcpy(gov_name, buf, len); | |
96 | gov_name[len] = '\0'; | |
97 | if (gov_name[len - 1] == '\n') | |
98 | gov_name[--len] = '\0'; | |
99 | ||
100 | mutex_lock(&cpuidle_lock); | |
101 | ||
102 | list_for_each_entry(gov, &cpuidle_governors, governor_list) { | |
103 | if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) { | |
104 | ret = cpuidle_switch_governor(gov); | |
105 | break; | |
106 | } | |
107 | } | |
108 | ||
109 | mutex_unlock(&cpuidle_lock); | |
110 | ||
111 | if (ret) | |
112 | return ret; | |
113 | else | |
114 | return count; | |
115 | } | |
116 | ||
8a25a2fd KS |
117 | static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL); |
118 | static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL); | |
4f86d3a8 | 119 | |
8a25a2fd KS |
120 | static struct attribute *cpuidle_default_attrs[] = { |
121 | &dev_attr_current_driver.attr, | |
122 | &dev_attr_current_governor_ro.attr, | |
4f86d3a8 LB |
123 | NULL |
124 | }; | |
125 | ||
8a25a2fd KS |
126 | static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL); |
127 | static DEVICE_ATTR(current_governor, 0644, show_current_governor, | |
128 | store_current_governor); | |
4f86d3a8 | 129 | |
8a25a2fd KS |
130 | static struct attribute *cpuidle_switch_attrs[] = { |
131 | &dev_attr_available_governors.attr, | |
132 | &dev_attr_current_driver.attr, | |
133 | &dev_attr_current_governor.attr, | |
4f86d3a8 LB |
134 | NULL |
135 | }; | |
136 | ||
8a25a2fd KS |
137 | static struct attribute_group cpuidle_attr_group = { |
138 | .attrs = cpuidle_default_attrs, | |
4f86d3a8 LB |
139 | .name = "cpuidle", |
140 | }; | |
141 | ||
142 | /** | |
8a25a2fd | 143 | * cpuidle_add_interface - add CPU global sysfs attributes |
4f86d3a8 | 144 | */ |
8a25a2fd | 145 | int cpuidle_add_interface(struct device *dev) |
4f86d3a8 LB |
146 | { |
147 | if (sysfs_switch) | |
8a25a2fd | 148 | cpuidle_attr_group.attrs = cpuidle_switch_attrs; |
4f86d3a8 | 149 | |
8a25a2fd | 150 | return sysfs_create_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
151 | } |
152 | ||
153 | /** | |
8a25a2fd | 154 | * cpuidle_remove_interface - remove CPU global sysfs attributes |
4f86d3a8 | 155 | */ |
8a25a2fd | 156 | void cpuidle_remove_interface(struct device *dev) |
4f86d3a8 | 157 | { |
8a25a2fd | 158 | sysfs_remove_group(&dev->kobj, &cpuidle_attr_group); |
4f86d3a8 LB |
159 | } |
160 | ||
161 | struct cpuidle_attr { | |
162 | struct attribute attr; | |
163 | ssize_t (*show)(struct cpuidle_device *, char *); | |
164 | ssize_t (*store)(struct cpuidle_device *, const char *, size_t count); | |
165 | }; | |
166 | ||
167 | #define define_one_ro(_name, show) \ | |
168 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
169 | #define define_one_rw(_name, show, store) \ | |
170 | static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
171 | ||
4f86d3a8 | 172 | #define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr) |
f89ae89e | 173 | |
728ce22b DL |
174 | struct cpuidle_device_kobj { |
175 | struct cpuidle_device *dev; | |
176 | struct completion kobj_unregister; | |
177 | struct kobject kobj; | |
178 | }; | |
179 | ||
180 | static inline struct cpuidle_device *to_cpuidle_device(struct kobject *kobj) | |
181 | { | |
182 | struct cpuidle_device_kobj *kdev = | |
183 | container_of(kobj, struct cpuidle_device_kobj, kobj); | |
184 | ||
185 | return kdev->dev; | |
186 | } | |
187 | ||
f89ae89e DL |
188 | static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr, |
189 | char *buf) | |
4f86d3a8 LB |
190 | { |
191 | int ret = -EIO; | |
728ce22b | 192 | struct cpuidle_device *dev = to_cpuidle_device(kobj); |
f89ae89e | 193 | struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr); |
4f86d3a8 LB |
194 | |
195 | if (cattr->show) { | |
196 | mutex_lock(&cpuidle_lock); | |
197 | ret = cattr->show(dev, buf); | |
198 | mutex_unlock(&cpuidle_lock); | |
199 | } | |
200 | return ret; | |
201 | } | |
202 | ||
f89ae89e DL |
203 | static ssize_t cpuidle_store(struct kobject *kobj, struct attribute *attr, |
204 | const char *buf, size_t count) | |
4f86d3a8 LB |
205 | { |
206 | int ret = -EIO; | |
728ce22b | 207 | struct cpuidle_device *dev = to_cpuidle_device(kobj); |
f89ae89e | 208 | struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr); |
4f86d3a8 LB |
209 | |
210 | if (cattr->store) { | |
211 | mutex_lock(&cpuidle_lock); | |
212 | ret = cattr->store(dev, buf, count); | |
213 | mutex_unlock(&cpuidle_lock); | |
214 | } | |
215 | return ret; | |
216 | } | |
217 | ||
52cf25d0 | 218 | static const struct sysfs_ops cpuidle_sysfs_ops = { |
4f86d3a8 LB |
219 | .show = cpuidle_show, |
220 | .store = cpuidle_store, | |
221 | }; | |
222 | ||
223 | static void cpuidle_sysfs_release(struct kobject *kobj) | |
224 | { | |
728ce22b DL |
225 | struct cpuidle_device_kobj *kdev = |
226 | container_of(kobj, struct cpuidle_device_kobj, kobj); | |
4f86d3a8 | 227 | |
728ce22b | 228 | complete(&kdev->kobj_unregister); |
4f86d3a8 LB |
229 | } |
230 | ||
231 | static struct kobj_type ktype_cpuidle = { | |
232 | .sysfs_ops = &cpuidle_sysfs_ops, | |
233 | .release = cpuidle_sysfs_release, | |
234 | }; | |
235 | ||
236 | struct cpuidle_state_attr { | |
237 | struct attribute attr; | |
4202735e DD |
238 | ssize_t (*show)(struct cpuidle_state *, \ |
239 | struct cpuidle_state_usage *, char *); | |
dc7fd275 SL |
240 | ssize_t (*store)(struct cpuidle_state *, \ |
241 | struct cpuidle_state_usage *, const char *, size_t); | |
4f86d3a8 LB |
242 | }; |
243 | ||
244 | #define define_one_state_ro(_name, show) \ | |
245 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL) | |
246 | ||
3a53396b SL |
247 | #define define_one_state_rw(_name, show, store) \ |
248 | static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store) | |
249 | ||
4f86d3a8 | 250 | #define define_show_state_function(_name) \ |
4202735e DD |
251 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
252 | struct cpuidle_state_usage *state_usage, char *buf) \ | |
4f86d3a8 LB |
253 | { \ |
254 | return sprintf(buf, "%u\n", state->_name);\ | |
255 | } | |
256 | ||
dc7fd275 | 257 | #define define_store_state_ull_function(_name) \ |
3a53396b | 258 | static ssize_t store_state_##_name(struct cpuidle_state *state, \ |
f89ae89e DL |
259 | struct cpuidle_state_usage *state_usage, \ |
260 | const char *buf, size_t size) \ | |
3a53396b | 261 | { \ |
dc7fd275 | 262 | unsigned long long value; \ |
3a53396b SL |
263 | int err; \ |
264 | if (!capable(CAP_SYS_ADMIN)) \ | |
265 | return -EPERM; \ | |
dc7fd275 | 266 | err = kstrtoull(buf, 0, &value); \ |
3a53396b SL |
267 | if (err) \ |
268 | return err; \ | |
269 | if (value) \ | |
dc7fd275 | 270 | state_usage->_name = 1; \ |
3a53396b | 271 | else \ |
dc7fd275 | 272 | state_usage->_name = 0; \ |
3a53396b SL |
273 | return size; \ |
274 | } | |
275 | ||
8b78cf60 | 276 | #define define_show_state_ull_function(_name) \ |
4202735e | 277 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
f89ae89e DL |
278 | struct cpuidle_state_usage *state_usage, \ |
279 | char *buf) \ | |
8b78cf60 | 280 | { \ |
4202735e | 281 | return sprintf(buf, "%llu\n", state_usage->_name);\ |
8b78cf60 YY |
282 | } |
283 | ||
4fcb2fcd | 284 | #define define_show_state_str_function(_name) \ |
4202735e | 285 | static ssize_t show_state_##_name(struct cpuidle_state *state, \ |
f89ae89e DL |
286 | struct cpuidle_state_usage *state_usage, \ |
287 | char *buf) \ | |
4fcb2fcd VP |
288 | { \ |
289 | if (state->_name[0] == '\0')\ | |
290 | return sprintf(buf, "<null>\n");\ | |
291 | return sprintf(buf, "%s\n", state->_name);\ | |
4f86d3a8 LB |
292 | } |
293 | ||
294 | define_show_state_function(exit_latency) | |
295 | define_show_state_function(power_usage) | |
8b78cf60 YY |
296 | define_show_state_ull_function(usage) |
297 | define_show_state_ull_function(time) | |
4fcb2fcd VP |
298 | define_show_state_str_function(name) |
299 | define_show_state_str_function(desc) | |
dc7fd275 SL |
300 | define_show_state_ull_function(disable) |
301 | define_store_state_ull_function(disable) | |
4fcb2fcd | 302 | |
4f86d3a8 | 303 | define_one_state_ro(name, show_state_name); |
4fcb2fcd | 304 | define_one_state_ro(desc, show_state_desc); |
4f86d3a8 LB |
305 | define_one_state_ro(latency, show_state_exit_latency); |
306 | define_one_state_ro(power, show_state_power_usage); | |
307 | define_one_state_ro(usage, show_state_usage); | |
308 | define_one_state_ro(time, show_state_time); | |
3a53396b | 309 | define_one_state_rw(disable, show_state_disable, store_state_disable); |
4f86d3a8 LB |
310 | |
311 | static struct attribute *cpuidle_state_default_attrs[] = { | |
312 | &attr_name.attr, | |
4fcb2fcd | 313 | &attr_desc.attr, |
4f86d3a8 LB |
314 | &attr_latency.attr, |
315 | &attr_power.attr, | |
316 | &attr_usage.attr, | |
317 | &attr_time.attr, | |
3a53396b | 318 | &attr_disable.attr, |
4f86d3a8 LB |
319 | NULL |
320 | }; | |
321 | ||
349631e0 DL |
322 | struct cpuidle_state_kobj { |
323 | struct cpuidle_state *state; | |
324 | struct cpuidle_state_usage *state_usage; | |
325 | struct completion kobj_unregister; | |
326 | struct kobject kobj; | |
327 | }; | |
328 | ||
4f86d3a8 LB |
329 | #define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj) |
330 | #define kobj_to_state(k) (kobj_to_state_obj(k)->state) | |
4202735e | 331 | #define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage) |
4f86d3a8 | 332 | #define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr) |
f89ae89e DL |
333 | |
334 | static ssize_t cpuidle_state_show(struct kobject *kobj, struct attribute *attr, | |
335 | char * buf) | |
4f86d3a8 LB |
336 | { |
337 | int ret = -EIO; | |
338 | struct cpuidle_state *state = kobj_to_state(kobj); | |
4202735e | 339 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
4f86d3a8 LB |
340 | struct cpuidle_state_attr * cattr = attr_to_stateattr(attr); |
341 | ||
342 | if (cattr->show) | |
4202735e | 343 | ret = cattr->show(state, state_usage, buf); |
4f86d3a8 LB |
344 | |
345 | return ret; | |
346 | } | |
347 | ||
f89ae89e DL |
348 | static ssize_t cpuidle_state_store(struct kobject *kobj, struct attribute *attr, |
349 | const char *buf, size_t size) | |
3a53396b SL |
350 | { |
351 | int ret = -EIO; | |
352 | struct cpuidle_state *state = kobj_to_state(kobj); | |
dc7fd275 | 353 | struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj); |
3a53396b SL |
354 | struct cpuidle_state_attr *cattr = attr_to_stateattr(attr); |
355 | ||
356 | if (cattr->store) | |
dc7fd275 | 357 | ret = cattr->store(state, state_usage, buf, size); |
3a53396b SL |
358 | |
359 | return ret; | |
360 | } | |
361 | ||
52cf25d0 | 362 | static const struct sysfs_ops cpuidle_state_sysfs_ops = { |
4f86d3a8 | 363 | .show = cpuidle_state_show, |
3a53396b | 364 | .store = cpuidle_state_store, |
4f86d3a8 LB |
365 | }; |
366 | ||
367 | static void cpuidle_state_sysfs_release(struct kobject *kobj) | |
368 | { | |
369 | struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj); | |
370 | ||
371 | complete(&state_obj->kobj_unregister); | |
372 | } | |
373 | ||
374 | static struct kobj_type ktype_state_cpuidle = { | |
375 | .sysfs_ops = &cpuidle_state_sysfs_ops, | |
376 | .default_attrs = cpuidle_state_default_attrs, | |
377 | .release = cpuidle_state_sysfs_release, | |
378 | }; | |
379 | ||
42b16b3f | 380 | static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i) |
4f86d3a8 | 381 | { |
c10997f6 | 382 | kobject_put(&device->kobjs[i]->kobj); |
4f86d3a8 LB |
383 | wait_for_completion(&device->kobjs[i]->kobj_unregister); |
384 | kfree(device->kobjs[i]); | |
385 | device->kobjs[i] = NULL; | |
386 | } | |
387 | ||
388 | /** | |
bf4d1b5d | 389 | * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes |
4f86d3a8 LB |
390 | * @device: the target device |
391 | */ | |
bf4d1b5d | 392 | static int cpuidle_add_state_sysfs(struct cpuidle_device *device) |
4f86d3a8 LB |
393 | { |
394 | int i, ret = -ENOMEM; | |
395 | struct cpuidle_state_kobj *kobj; | |
728ce22b | 396 | struct cpuidle_device_kobj *kdev = device->kobj_dev; |
bf4d1b5d | 397 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device); |
4f86d3a8 LB |
398 | |
399 | /* state statistics */ | |
392370e7 | 400 | for (i = 0; i < device->state_count; i++) { |
4f86d3a8 LB |
401 | kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL); |
402 | if (!kobj) | |
403 | goto error_state; | |
46bcfad7 | 404 | kobj->state = &drv->states[i]; |
4202735e | 405 | kobj->state_usage = &device->states_usage[i]; |
4f86d3a8 LB |
406 | init_completion(&kobj->kobj_unregister); |
407 | ||
e45a00d6 | 408 | ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle, |
728ce22b | 409 | &kdev->kobj, "state%d", i); |
4f86d3a8 LB |
410 | if (ret) { |
411 | kfree(kobj); | |
412 | goto error_state; | |
413 | } | |
94f57f33 | 414 | kobject_uevent(&kobj->kobj, KOBJ_ADD); |
4f86d3a8 LB |
415 | device->kobjs[i] = kobj; |
416 | } | |
417 | ||
418 | return 0; | |
419 | ||
420 | error_state: | |
421 | for (i = i - 1; i >= 0; i--) | |
422 | cpuidle_free_state_kobj(device, i); | |
423 | return ret; | |
424 | } | |
425 | ||
426 | /** | |
bf4d1b5d | 427 | * cpuidle_remove_driver_sysfs - removes the cpuidle states sysfs attributes |
4f86d3a8 LB |
428 | * @device: the target device |
429 | */ | |
bf4d1b5d | 430 | static void cpuidle_remove_state_sysfs(struct cpuidle_device *device) |
4f86d3a8 LB |
431 | { |
432 | int i; | |
433 | ||
434 | for (i = 0; i < device->state_count; i++) | |
435 | cpuidle_free_state_kobj(device, i); | |
436 | } | |
437 | ||
bf4d1b5d DL |
438 | #ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS |
439 | #define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj) | |
440 | #define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr) | |
441 | ||
442 | #define define_one_driver_ro(_name, show) \ | |
443 | static struct cpuidle_driver_attr attr_driver_##_name = \ | |
444 | __ATTR(_name, 0644, show, NULL) | |
445 | ||
446 | struct cpuidle_driver_kobj { | |
447 | struct cpuidle_driver *drv; | |
448 | struct completion kobj_unregister; | |
449 | struct kobject kobj; | |
450 | }; | |
451 | ||
452 | struct cpuidle_driver_attr { | |
453 | struct attribute attr; | |
454 | ssize_t (*show)(struct cpuidle_driver *, char *); | |
455 | ssize_t (*store)(struct cpuidle_driver *, const char *, size_t); | |
456 | }; | |
457 | ||
458 | static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf) | |
459 | { | |
460 | ssize_t ret; | |
461 | ||
462 | spin_lock(&cpuidle_driver_lock); | |
463 | ret = sprintf(buf, "%s\n", drv ? drv->name : "none"); | |
464 | spin_unlock(&cpuidle_driver_lock); | |
465 | ||
466 | return ret; | |
467 | } | |
468 | ||
469 | static void cpuidle_driver_sysfs_release(struct kobject *kobj) | |
470 | { | |
471 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
472 | complete(&driver_kobj->kobj_unregister); | |
473 | } | |
474 | ||
f89ae89e DL |
475 | static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr, |
476 | char *buf) | |
bf4d1b5d DL |
477 | { |
478 | int ret = -EIO; | |
479 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
480 | struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr); | |
481 | ||
482 | if (dattr->show) | |
483 | ret = dattr->show(driver_kobj->drv, buf); | |
484 | ||
485 | return ret; | |
486 | } | |
487 | ||
488 | static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr, | |
489 | const char *buf, size_t size) | |
490 | { | |
491 | int ret = -EIO; | |
492 | struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj); | |
493 | struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr); | |
494 | ||
495 | if (dattr->store) | |
496 | ret = dattr->store(driver_kobj->drv, buf, size); | |
497 | ||
498 | return ret; | |
499 | } | |
500 | ||
501 | define_one_driver_ro(name, show_driver_name); | |
502 | ||
503 | static const struct sysfs_ops cpuidle_driver_sysfs_ops = { | |
504 | .show = cpuidle_driver_show, | |
505 | .store = cpuidle_driver_store, | |
506 | }; | |
507 | ||
508 | static struct attribute *cpuidle_driver_default_attrs[] = { | |
509 | &attr_driver_name.attr, | |
510 | NULL | |
511 | }; | |
512 | ||
513 | static struct kobj_type ktype_driver_cpuidle = { | |
514 | .sysfs_ops = &cpuidle_driver_sysfs_ops, | |
515 | .default_attrs = cpuidle_driver_default_attrs, | |
516 | .release = cpuidle_driver_sysfs_release, | |
517 | }; | |
518 | ||
519 | /** | |
520 | * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute | |
521 | * @device: the target device | |
522 | */ | |
523 | static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) | |
524 | { | |
525 | struct cpuidle_driver_kobj *kdrv; | |
728ce22b | 526 | struct cpuidle_device_kobj *kdev = dev->kobj_dev; |
bf4d1b5d DL |
527 | struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); |
528 | int ret; | |
529 | ||
530 | kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL); | |
531 | if (!kdrv) | |
532 | return -ENOMEM; | |
533 | ||
534 | kdrv->drv = drv; | |
535 | init_completion(&kdrv->kobj_unregister); | |
536 | ||
537 | ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle, | |
728ce22b | 538 | &kdev->kobj, "driver"); |
bf4d1b5d DL |
539 | if (ret) { |
540 | kfree(kdrv); | |
541 | return ret; | |
542 | } | |
543 | ||
544 | kobject_uevent(&kdrv->kobj, KOBJ_ADD); | |
545 | dev->kobj_driver = kdrv; | |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
550 | /** | |
551 | * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute | |
552 | * @device: the target device | |
553 | */ | |
554 | static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev) | |
555 | { | |
556 | struct cpuidle_driver_kobj *kdrv = dev->kobj_driver; | |
557 | kobject_put(&kdrv->kobj); | |
558 | wait_for_completion(&kdrv->kobj_unregister); | |
559 | kfree(kdrv); | |
560 | } | |
561 | #else | |
562 | static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev) | |
563 | { | |
564 | return 0; | |
565 | } | |
566 | ||
567 | static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev) | |
568 | { | |
569 | ; | |
570 | } | |
571 | #endif | |
572 | ||
573 | /** | |
574 | * cpuidle_add_device_sysfs - adds device specific sysfs attributes | |
575 | * @device: the target device | |
576 | */ | |
577 | int cpuidle_add_device_sysfs(struct cpuidle_device *device) | |
578 | { | |
579 | int ret; | |
580 | ||
581 | ret = cpuidle_add_state_sysfs(device); | |
582 | if (ret) | |
583 | return ret; | |
584 | ||
585 | ret = cpuidle_add_driver_sysfs(device); | |
586 | if (ret) | |
587 | cpuidle_remove_state_sysfs(device); | |
588 | return ret; | |
589 | } | |
590 | ||
591 | /** | |
592 | * cpuidle_remove_device_sysfs : removes device specific sysfs attributes | |
593 | * @device : the target device | |
594 | */ | |
595 | void cpuidle_remove_device_sysfs(struct cpuidle_device *device) | |
596 | { | |
597 | cpuidle_remove_driver_sysfs(device); | |
598 | cpuidle_remove_state_sysfs(device); | |
599 | } | |
600 | ||
4f86d3a8 LB |
601 | /** |
602 | * cpuidle_add_sysfs - creates a sysfs instance for the target device | |
8a25a2fd | 603 | * @dev: the target device |
4f86d3a8 | 604 | */ |
1aef40e2 | 605 | int cpuidle_add_sysfs(struct cpuidle_device *dev) |
4f86d3a8 | 606 | { |
728ce22b | 607 | struct cpuidle_device_kobj *kdev; |
1aef40e2 | 608 | struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu); |
94f57f33 | 609 | int error; |
4f86d3a8 | 610 | |
728ce22b DL |
611 | kdev = kzalloc(sizeof(*kdev), GFP_KERNEL); |
612 | if (!kdev) | |
613 | return -ENOMEM; | |
614 | kdev->dev = dev; | |
615 | dev->kobj_dev = kdev; | |
616 | ||
617 | init_completion(&kdev->kobj_unregister); | |
618 | ||
619 | error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj, | |
620 | "cpuidle"); | |
621 | if (error) { | |
622 | kfree(kdev); | |
623 | return error; | |
624 | } | |
e45a00d6 | 625 | |
728ce22b DL |
626 | kobject_uevent(&kdev->kobj, KOBJ_ADD); |
627 | ||
628 | return 0; | |
4f86d3a8 LB |
629 | } |
630 | ||
631 | /** | |
632 | * cpuidle_remove_sysfs - deletes a sysfs instance on the target device | |
8a25a2fd | 633 | * @dev: the target device |
4f86d3a8 | 634 | */ |
1aef40e2 | 635 | void cpuidle_remove_sysfs(struct cpuidle_device *dev) |
4f86d3a8 | 636 | { |
728ce22b DL |
637 | struct cpuidle_device_kobj *kdev = dev->kobj_dev; |
638 | ||
639 | kobject_put(&kdev->kobj); | |
640 | wait_for_completion(&kdev->kobj_unregister); | |
641 | kfree(kdev); | |
4f86d3a8 | 642 | } |