blob: 832a2c3f01ffccf691842507955078299799eb86 [file] [log] [blame]
Len Brown4f86d3a2007-10-03 18:58:00 -04001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Len Brown4f86d3a2007-10-03 18:58:00 -040013#include <linux/cpu.h>
Daniel Lezcano728ce222013-06-12 15:08:51 +020014#include <linux/completion.h>
ShuoX Liu3a533962012-03-28 15:19:11 -070015#include <linux/capability.h>
Daniel Lezcano8f3e9952012-10-31 01:09:02 +010016#include <linux/device.h>
Daniel Lezcano728ce222013-06-12 15:08:51 +020017#include <linux/kobject.h>
Len Brown4f86d3a2007-10-03 18:58:00 -040018
19#include "cpuidle.h"
20
21static unsigned int sysfs_switch;
22static 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
Kay Sievers8a25a2f2011-12-21 14:29:42 -080029static ssize_t show_available_governors(struct device *dev,
30 struct device_attribute *attr,
Rabin Vincent66198f32008-08-12 15:08:45 -070031 char *buf)
Len Brown4f86d3a2007-10-03 18:58:00 -040032{
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) {
Daniel Lezcanof89ae892013-06-12 15:08:50 +020038 if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) -
39 CPUIDLE_NAME_LEN - 2))
Len Brown4f86d3a2007-10-03 18:58:00 -040040 goto out;
41 i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
42 }
43
44out:
45 i+= sprintf(&buf[i], "\n");
46 mutex_unlock(&cpuidle_lock);
47 return i;
48}
49
Kay Sievers8a25a2f2011-12-21 14:29:42 -080050static ssize_t show_current_driver(struct device *dev,
51 struct device_attribute *attr,
Rabin Vincent66198f32008-08-12 15:08:45 -070052 char *buf)
Len Brown4f86d3a2007-10-03 18:58:00 -040053{
54 ssize_t ret;
Viresh Kumar1f6b9f72013-10-03 21:26:51 +053055 struct cpuidle_driver *drv;
Len Brown4f86d3a2007-10-03 18:58:00 -040056
57 spin_lock(&cpuidle_driver_lock);
Viresh Kumar1f6b9f72013-10-03 21:26:51 +053058 drv = cpuidle_get_driver();
59 if (drv)
60 ret = sprintf(buf, "%s\n", drv->name);
Len Brown4f86d3a2007-10-03 18:58:00 -040061 else
62 ret = sprintf(buf, "none\n");
63 spin_unlock(&cpuidle_driver_lock);
64
65 return ret;
66}
67
Kay Sievers8a25a2f2011-12-21 14:29:42 -080068static ssize_t show_current_governor(struct device *dev,
69 struct device_attribute *attr,
Rabin Vincent66198f32008-08-12 15:08:45 -070070 char *buf)
Len Brown4f86d3a2007-10-03 18:58:00 -040071{
72 ssize_t ret;
73
74 mutex_lock(&cpuidle_lock);
75 if (cpuidle_curr_governor)
76 ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
77 else
78 ret = sprintf(buf, "none\n");
79 mutex_unlock(&cpuidle_lock);
80
81 return ret;
82}
83
Kay Sievers8a25a2f2011-12-21 14:29:42 -080084static ssize_t store_current_governor(struct device *dev,
85 struct device_attribute *attr,
Rabin Vincent66198f32008-08-12 15:08:45 -070086 const char *buf, size_t count)
Len Brown4f86d3a2007-10-03 18:58:00 -040087{
88 char gov_name[CPUIDLE_NAME_LEN];
89 int ret = -EINVAL;
90 size_t len = count;
91 struct cpuidle_governor *gov;
92
93 if (!len || len >= sizeof(gov_name))
94 return -EINVAL;
95
96 memcpy(gov_name, buf, len);
97 gov_name[len] = '\0';
98 if (gov_name[len - 1] == '\n')
99 gov_name[--len] = '\0';
100
101 mutex_lock(&cpuidle_lock);
102
103 list_for_each_entry(gov, &cpuidle_governors, governor_list) {
104 if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
105 ret = cpuidle_switch_governor(gov);
106 break;
107 }
108 }
109
110 mutex_unlock(&cpuidle_lock);
111
112 if (ret)
113 return ret;
114 else
115 return count;
116}
117
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800118static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL);
119static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL);
Len Brown4f86d3a2007-10-03 18:58:00 -0400120
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800121static struct attribute *cpuidle_default_attrs[] = {
122 &dev_attr_current_driver.attr,
123 &dev_attr_current_governor_ro.attr,
Len Brown4f86d3a2007-10-03 18:58:00 -0400124 NULL
125};
126
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800127static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL);
128static DEVICE_ATTR(current_governor, 0644, show_current_governor,
129 store_current_governor);
Len Brown4f86d3a2007-10-03 18:58:00 -0400130
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800131static struct attribute *cpuidle_switch_attrs[] = {
132 &dev_attr_available_governors.attr,
133 &dev_attr_current_driver.attr,
134 &dev_attr_current_governor.attr,
Len Brown4f86d3a2007-10-03 18:58:00 -0400135 NULL
136};
137
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800138static struct attribute_group cpuidle_attr_group = {
139 .attrs = cpuidle_default_attrs,
Len Brown4f86d3a2007-10-03 18:58:00 -0400140 .name = "cpuidle",
141};
142
143/**
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800144 * cpuidle_add_interface - add CPU global sysfs attributes
Len Brown4f86d3a2007-10-03 18:58:00 -0400145 */
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800146int cpuidle_add_interface(struct device *dev)
Len Brown4f86d3a2007-10-03 18:58:00 -0400147{
148 if (sysfs_switch)
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800149 cpuidle_attr_group.attrs = cpuidle_switch_attrs;
Len Brown4f86d3a2007-10-03 18:58:00 -0400150
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800151 return sysfs_create_group(&dev->kobj, &cpuidle_attr_group);
Len Brown4f86d3a2007-10-03 18:58:00 -0400152}
153
154/**
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800155 * cpuidle_remove_interface - remove CPU global sysfs attributes
Len Brown4f86d3a2007-10-03 18:58:00 -0400156 */
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800157void cpuidle_remove_interface(struct device *dev)
Len Brown4f86d3a2007-10-03 18:58:00 -0400158{
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800159 sysfs_remove_group(&dev->kobj, &cpuidle_attr_group);
Len Brown4f86d3a2007-10-03 18:58:00 -0400160}
161
162struct cpuidle_attr {
163 struct attribute attr;
164 ssize_t (*show)(struct cpuidle_device *, char *);
165 ssize_t (*store)(struct cpuidle_device *, const char *, size_t count);
166};
167
168#define define_one_ro(_name, show) \
169 static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
170#define define_one_rw(_name, show, store) \
171 static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
172
Len Brown4f86d3a2007-10-03 18:58:00 -0400173#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200174
Daniel Lezcano728ce222013-06-12 15:08:51 +0200175struct cpuidle_device_kobj {
176 struct cpuidle_device *dev;
177 struct completion kobj_unregister;
178 struct kobject kobj;
179};
180
181static inline struct cpuidle_device *to_cpuidle_device(struct kobject *kobj)
182{
183 struct cpuidle_device_kobj *kdev =
184 container_of(kobj, struct cpuidle_device_kobj, kobj);
185
186 return kdev->dev;
187}
188
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200189static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr,
190 char *buf)
Len Brown4f86d3a2007-10-03 18:58:00 -0400191{
192 int ret = -EIO;
Daniel Lezcano728ce222013-06-12 15:08:51 +0200193 struct cpuidle_device *dev = to_cpuidle_device(kobj);
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200194 struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr);
Len Brown4f86d3a2007-10-03 18:58:00 -0400195
196 if (cattr->show) {
197 mutex_lock(&cpuidle_lock);
198 ret = cattr->show(dev, buf);
199 mutex_unlock(&cpuidle_lock);
200 }
201 return ret;
202}
203
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200204static ssize_t cpuidle_store(struct kobject *kobj, struct attribute *attr,
205 const char *buf, size_t count)
Len Brown4f86d3a2007-10-03 18:58:00 -0400206{
207 int ret = -EIO;
Daniel Lezcano728ce222013-06-12 15:08:51 +0200208 struct cpuidle_device *dev = to_cpuidle_device(kobj);
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200209 struct cpuidle_attr *cattr = attr_to_cpuidleattr(attr);
Len Brown4f86d3a2007-10-03 18:58:00 -0400210
211 if (cattr->store) {
212 mutex_lock(&cpuidle_lock);
213 ret = cattr->store(dev, buf, count);
214 mutex_unlock(&cpuidle_lock);
215 }
216 return ret;
217}
218
Emese Revfy52cf25d2010-01-19 02:58:23 +0100219static const struct sysfs_ops cpuidle_sysfs_ops = {
Len Brown4f86d3a2007-10-03 18:58:00 -0400220 .show = cpuidle_show,
221 .store = cpuidle_store,
222};
223
224static void cpuidle_sysfs_release(struct kobject *kobj)
225{
Daniel Lezcano728ce222013-06-12 15:08:51 +0200226 struct cpuidle_device_kobj *kdev =
227 container_of(kobj, struct cpuidle_device_kobj, kobj);
Len Brown4f86d3a2007-10-03 18:58:00 -0400228
Daniel Lezcano728ce222013-06-12 15:08:51 +0200229 complete(&kdev->kobj_unregister);
Len Brown4f86d3a2007-10-03 18:58:00 -0400230}
231
232static struct kobj_type ktype_cpuidle = {
233 .sysfs_ops = &cpuidle_sysfs_ops,
234 .release = cpuidle_sysfs_release,
235};
236
237struct cpuidle_state_attr {
238 struct attribute attr;
Deepthi Dharwar42027352011-10-28 16:20:33 +0530239 ssize_t (*show)(struct cpuidle_state *, \
240 struct cpuidle_state_usage *, char *);
ShuoX Liudc7fd272012-07-03 19:05:31 +0200241 ssize_t (*store)(struct cpuidle_state *, \
242 struct cpuidle_state_usage *, const char *, size_t);
Len Brown4f86d3a2007-10-03 18:58:00 -0400243};
244
245#define define_one_state_ro(_name, show) \
246static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
247
ShuoX Liu3a533962012-03-28 15:19:11 -0700248#define define_one_state_rw(_name, show, store) \
249static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store)
250
Len Brown4f86d3a2007-10-03 18:58:00 -0400251#define define_show_state_function(_name) \
Deepthi Dharwar42027352011-10-28 16:20:33 +0530252static ssize_t show_state_##_name(struct cpuidle_state *state, \
253 struct cpuidle_state_usage *state_usage, char *buf) \
Len Brown4f86d3a2007-10-03 18:58:00 -0400254{ \
255 return sprintf(buf, "%u\n", state->_name);\
256}
257
ShuoX Liudc7fd272012-07-03 19:05:31 +0200258#define define_store_state_ull_function(_name) \
ShuoX Liu3a533962012-03-28 15:19:11 -0700259static ssize_t store_state_##_name(struct cpuidle_state *state, \
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200260 struct cpuidle_state_usage *state_usage, \
261 const char *buf, size_t size) \
ShuoX Liu3a533962012-03-28 15:19:11 -0700262{ \
ShuoX Liudc7fd272012-07-03 19:05:31 +0200263 unsigned long long value; \
ShuoX Liu3a533962012-03-28 15:19:11 -0700264 int err; \
265 if (!capable(CAP_SYS_ADMIN)) \
266 return -EPERM; \
ShuoX Liudc7fd272012-07-03 19:05:31 +0200267 err = kstrtoull(buf, 0, &value); \
ShuoX Liu3a533962012-03-28 15:19:11 -0700268 if (err) \
269 return err; \
270 if (value) \
ShuoX Liudc7fd272012-07-03 19:05:31 +0200271 state_usage->_name = 1; \
ShuoX Liu3a533962012-03-28 15:19:11 -0700272 else \
ShuoX Liudc7fd272012-07-03 19:05:31 +0200273 state_usage->_name = 0; \
ShuoX Liu3a533962012-03-28 15:19:11 -0700274 return size; \
275}
276
Yi Yang8b78cf62008-02-25 08:46:12 +0800277#define define_show_state_ull_function(_name) \
Deepthi Dharwar42027352011-10-28 16:20:33 +0530278static ssize_t show_state_##_name(struct cpuidle_state *state, \
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200279 struct cpuidle_state_usage *state_usage, \
280 char *buf) \
Yi Yang8b78cf62008-02-25 08:46:12 +0800281{ \
Deepthi Dharwar42027352011-10-28 16:20:33 +0530282 return sprintf(buf, "%llu\n", state_usage->_name);\
Yi Yang8b78cf62008-02-25 08:46:12 +0800283}
284
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800285#define define_show_state_str_function(_name) \
Deepthi Dharwar42027352011-10-28 16:20:33 +0530286static ssize_t show_state_##_name(struct cpuidle_state *state, \
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200287 struct cpuidle_state_usage *state_usage, \
288 char *buf) \
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800289{ \
290 if (state->_name[0] == '\0')\
291 return sprintf(buf, "<null>\n");\
292 return sprintf(buf, "%s\n", state->_name);\
Len Brown4f86d3a2007-10-03 18:58:00 -0400293}
294
295define_show_state_function(exit_latency)
Daniel Lezcano9bc04822014-03-17 12:17:30 +0100296define_show_state_function(target_residency)
Len Brown4f86d3a2007-10-03 18:58:00 -0400297define_show_state_function(power_usage)
Yi Yang8b78cf62008-02-25 08:46:12 +0800298define_show_state_ull_function(usage)
299define_show_state_ull_function(time)
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800300define_show_state_str_function(name)
301define_show_state_str_function(desc)
ShuoX Liudc7fd272012-07-03 19:05:31 +0200302define_show_state_ull_function(disable)
303define_store_state_ull_function(disable)
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800304
Len Brown4f86d3a2007-10-03 18:58:00 -0400305define_one_state_ro(name, show_state_name);
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800306define_one_state_ro(desc, show_state_desc);
Len Brown4f86d3a2007-10-03 18:58:00 -0400307define_one_state_ro(latency, show_state_exit_latency);
Daniel Lezcano9bc04822014-03-17 12:17:30 +0100308define_one_state_ro(residency, show_state_target_residency);
Len Brown4f86d3a2007-10-03 18:58:00 -0400309define_one_state_ro(power, show_state_power_usage);
310define_one_state_ro(usage, show_state_usage);
311define_one_state_ro(time, show_state_time);
ShuoX Liu3a533962012-03-28 15:19:11 -0700312define_one_state_rw(disable, show_state_disable, store_state_disable);
Len Brown4f86d3a2007-10-03 18:58:00 -0400313
314static struct attribute *cpuidle_state_default_attrs[] = {
315 &attr_name.attr,
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800316 &attr_desc.attr,
Len Brown4f86d3a2007-10-03 18:58:00 -0400317 &attr_latency.attr,
Daniel Lezcano9bc04822014-03-17 12:17:30 +0100318 &attr_residency.attr,
Len Brown4f86d3a2007-10-03 18:58:00 -0400319 &attr_power.attr,
320 &attr_usage.attr,
321 &attr_time.attr,
ShuoX Liu3a533962012-03-28 15:19:11 -0700322 &attr_disable.attr,
Len Brown4f86d3a2007-10-03 18:58:00 -0400323 NULL
324};
325
Daniel Lezcano349631e2012-10-31 01:05:16 +0100326struct cpuidle_state_kobj {
327 struct cpuidle_state *state;
328 struct cpuidle_state_usage *state_usage;
329 struct completion kobj_unregister;
330 struct kobject kobj;
331};
332
Len Brown4f86d3a2007-10-03 18:58:00 -0400333#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
334#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
Deepthi Dharwar42027352011-10-28 16:20:33 +0530335#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
Len Brown4f86d3a2007-10-03 18:58:00 -0400336#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200337
338static ssize_t cpuidle_state_show(struct kobject *kobj, struct attribute *attr,
339 char * buf)
Len Brown4f86d3a2007-10-03 18:58:00 -0400340{
341 int ret = -EIO;
342 struct cpuidle_state *state = kobj_to_state(kobj);
Deepthi Dharwar42027352011-10-28 16:20:33 +0530343 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
Len Brown4f86d3a2007-10-03 18:58:00 -0400344 struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
345
346 if (cattr->show)
Deepthi Dharwar42027352011-10-28 16:20:33 +0530347 ret = cattr->show(state, state_usage, buf);
Len Brown4f86d3a2007-10-03 18:58:00 -0400348
349 return ret;
350}
351
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200352static ssize_t cpuidle_state_store(struct kobject *kobj, struct attribute *attr,
353 const char *buf, size_t size)
ShuoX Liu3a533962012-03-28 15:19:11 -0700354{
355 int ret = -EIO;
356 struct cpuidle_state *state = kobj_to_state(kobj);
ShuoX Liudc7fd272012-07-03 19:05:31 +0200357 struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
ShuoX Liu3a533962012-03-28 15:19:11 -0700358 struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
359
360 if (cattr->store)
ShuoX Liudc7fd272012-07-03 19:05:31 +0200361 ret = cattr->store(state, state_usage, buf, size);
ShuoX Liu3a533962012-03-28 15:19:11 -0700362
363 return ret;
364}
365
Emese Revfy52cf25d2010-01-19 02:58:23 +0100366static const struct sysfs_ops cpuidle_state_sysfs_ops = {
Len Brown4f86d3a2007-10-03 18:58:00 -0400367 .show = cpuidle_state_show,
ShuoX Liu3a533962012-03-28 15:19:11 -0700368 .store = cpuidle_state_store,
Len Brown4f86d3a2007-10-03 18:58:00 -0400369};
370
371static void cpuidle_state_sysfs_release(struct kobject *kobj)
372{
373 struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
374
375 complete(&state_obj->kobj_unregister);
376}
377
378static struct kobj_type ktype_state_cpuidle = {
379 .sysfs_ops = &cpuidle_state_sysfs_ops,
380 .default_attrs = cpuidle_state_default_attrs,
381 .release = cpuidle_state_sysfs_release,
382};
383
Jesper Juhl42b16b32011-01-17 00:09:38 +0100384static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
Len Brown4f86d3a2007-10-03 18:58:00 -0400385{
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800386 kobject_put(&device->kobjs[i]->kobj);
Len Brown4f86d3a2007-10-03 18:58:00 -0400387 wait_for_completion(&device->kobjs[i]->kobj_unregister);
388 kfree(device->kobjs[i]);
389 device->kobjs[i] = NULL;
390}
391
392/**
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000393 * cpuidle_add_state_sysfs - adds cpuidle states sysfs attributes
Len Brown4f86d3a2007-10-03 18:58:00 -0400394 * @device: the target device
395 */
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000396static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
Len Brown4f86d3a2007-10-03 18:58:00 -0400397{
398 int i, ret = -ENOMEM;
399 struct cpuidle_state_kobj *kobj;
Daniel Lezcano728ce222013-06-12 15:08:51 +0200400 struct cpuidle_device_kobj *kdev = device->kobj_dev;
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000401 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
Len Brown4f86d3a2007-10-03 18:58:00 -0400402
403 /* state statistics */
Bartlomiej Zolnierkiewiczd75e4af2015-03-31 20:15:09 +0200404 for (i = 0; i < drv->state_count; i++) {
Len Brown4f86d3a2007-10-03 18:58:00 -0400405 kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
406 if (!kobj)
407 goto error_state;
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530408 kobj->state = &drv->states[i];
Deepthi Dharwar42027352011-10-28 16:20:33 +0530409 kobj->state_usage = &device->states_usage[i];
Len Brown4f86d3a2007-10-03 18:58:00 -0400410 init_completion(&kobj->kobj_unregister);
411
Daniel Lezcanoe45a00d2012-10-26 12:26:32 +0200412 ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,
Daniel Lezcano728ce222013-06-12 15:08:51 +0200413 &kdev->kobj, "state%d", i);
Len Brown4f86d3a2007-10-03 18:58:00 -0400414 if (ret) {
415 kfree(kobj);
416 goto error_state;
417 }
Greg Kroah-Hartman94f57f32007-12-17 15:54:39 -0400418 kobject_uevent(&kobj->kobj, KOBJ_ADD);
Len Brown4f86d3a2007-10-03 18:58:00 -0400419 device->kobjs[i] = kobj;
420 }
421
422 return 0;
423
424error_state:
425 for (i = i - 1; i >= 0; i--)
426 cpuidle_free_state_kobj(device, i);
427 return ret;
428}
429
430/**
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000431 * cpuidle_remove_driver_sysfs - removes the cpuidle states sysfs attributes
Len Brown4f86d3a2007-10-03 18:58:00 -0400432 * @device: the target device
433 */
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000434static void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
Len Brown4f86d3a2007-10-03 18:58:00 -0400435{
Bartlomiej Zolnierkiewiczd75e4af2015-03-31 20:15:09 +0200436 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
Len Brown4f86d3a2007-10-03 18:58:00 -0400437 int i;
438
Bartlomiej Zolnierkiewiczd75e4af2015-03-31 20:15:09 +0200439 for (i = 0; i < drv->state_count; i++)
Len Brown4f86d3a2007-10-03 18:58:00 -0400440 cpuidle_free_state_kobj(device, i);
441}
442
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000443#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
444#define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj)
445#define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr)
446
447#define define_one_driver_ro(_name, show) \
448 static struct cpuidle_driver_attr attr_driver_##_name = \
Mohammad Merajul Islam Molla4f8eea92014-07-12 19:29:22 +0600449 __ATTR(_name, 0444, show, NULL)
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000450
451struct cpuidle_driver_kobj {
452 struct cpuidle_driver *drv;
453 struct completion kobj_unregister;
454 struct kobject kobj;
455};
456
457struct cpuidle_driver_attr {
458 struct attribute attr;
459 ssize_t (*show)(struct cpuidle_driver *, char *);
460 ssize_t (*store)(struct cpuidle_driver *, const char *, size_t);
461};
462
463static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf)
464{
465 ssize_t ret;
466
467 spin_lock(&cpuidle_driver_lock);
468 ret = sprintf(buf, "%s\n", drv ? drv->name : "none");
469 spin_unlock(&cpuidle_driver_lock);
470
471 return ret;
472}
473
474static void cpuidle_driver_sysfs_release(struct kobject *kobj)
475{
476 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
477 complete(&driver_kobj->kobj_unregister);
478}
479
Daniel Lezcanof89ae892013-06-12 15:08:50 +0200480static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr,
481 char *buf)
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000482{
483 int ret = -EIO;
484 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
485 struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
486
487 if (dattr->show)
488 ret = dattr->show(driver_kobj->drv, buf);
489
490 return ret;
491}
492
493static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr,
494 const char *buf, size_t size)
495{
496 int ret = -EIO;
497 struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
498 struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
499
500 if (dattr->store)
501 ret = dattr->store(driver_kobj->drv, buf, size);
502
503 return ret;
504}
505
506define_one_driver_ro(name, show_driver_name);
507
508static const struct sysfs_ops cpuidle_driver_sysfs_ops = {
509 .show = cpuidle_driver_show,
510 .store = cpuidle_driver_store,
511};
512
513static struct attribute *cpuidle_driver_default_attrs[] = {
514 &attr_driver_name.attr,
515 NULL
516};
517
518static struct kobj_type ktype_driver_cpuidle = {
519 .sysfs_ops = &cpuidle_driver_sysfs_ops,
520 .default_attrs = cpuidle_driver_default_attrs,
521 .release = cpuidle_driver_sysfs_release,
522};
523
524/**
525 * cpuidle_add_driver_sysfs - adds the driver name sysfs attribute
526 * @device: the target device
527 */
528static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
529{
530 struct cpuidle_driver_kobj *kdrv;
Daniel Lezcano728ce222013-06-12 15:08:51 +0200531 struct cpuidle_device_kobj *kdev = dev->kobj_dev;
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000532 struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
533 int ret;
534
535 kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL);
536 if (!kdrv)
537 return -ENOMEM;
538
539 kdrv->drv = drv;
540 init_completion(&kdrv->kobj_unregister);
541
542 ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
Daniel Lezcano728ce222013-06-12 15:08:51 +0200543 &kdev->kobj, "driver");
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000544 if (ret) {
545 kfree(kdrv);
546 return ret;
547 }
548
549 kobject_uevent(&kdrv->kobj, KOBJ_ADD);
550 dev->kobj_driver = kdrv;
551
552 return ret;
553}
554
555/**
556 * cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute
557 * @device: the target device
558 */
559static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
560{
561 struct cpuidle_driver_kobj *kdrv = dev->kobj_driver;
562 kobject_put(&kdrv->kobj);
563 wait_for_completion(&kdrv->kobj_unregister);
564 kfree(kdrv);
565}
566#else
567static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
568{
569 return 0;
570}
571
572static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
573{
574 ;
575}
576#endif
577
578/**
579 * cpuidle_add_device_sysfs - adds device specific sysfs attributes
580 * @device: the target device
581 */
582int cpuidle_add_device_sysfs(struct cpuidle_device *device)
583{
584 int ret;
585
586 ret = cpuidle_add_state_sysfs(device);
587 if (ret)
588 return ret;
589
590 ret = cpuidle_add_driver_sysfs(device);
591 if (ret)
592 cpuidle_remove_state_sysfs(device);
593 return ret;
594}
595
596/**
597 * cpuidle_remove_device_sysfs : removes device specific sysfs attributes
598 * @device : the target device
599 */
600void cpuidle_remove_device_sysfs(struct cpuidle_device *device)
601{
602 cpuidle_remove_driver_sysfs(device);
603 cpuidle_remove_state_sysfs(device);
604}
605
Len Brown4f86d3a2007-10-03 18:58:00 -0400606/**
607 * cpuidle_add_sysfs - creates a sysfs instance for the target device
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800608 * @dev: the target device
Len Brown4f86d3a2007-10-03 18:58:00 -0400609 */
Daniel Lezcano1aef40e2012-10-26 12:26:24 +0200610int cpuidle_add_sysfs(struct cpuidle_device *dev)
Len Brown4f86d3a2007-10-03 18:58:00 -0400611{
Daniel Lezcano728ce222013-06-12 15:08:51 +0200612 struct cpuidle_device_kobj *kdev;
Daniel Lezcano1aef40e2012-10-26 12:26:24 +0200613 struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
Greg Kroah-Hartman94f57f32007-12-17 15:54:39 -0400614 int error;
Len Brown4f86d3a2007-10-03 18:58:00 -0400615
Daniel Lezcano728ce222013-06-12 15:08:51 +0200616 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
617 if (!kdev)
618 return -ENOMEM;
619 kdev->dev = dev;
620 dev->kobj_dev = kdev;
Daniel Lezcanoe45a00d2012-10-26 12:26:32 +0200621
Daniel Lezcano728ce222013-06-12 15:08:51 +0200622 init_completion(&kdev->kobj_unregister);
623
624 error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
625 "cpuidle");
626 if (error) {
627 kfree(kdev);
628 return error;
629 }
630
631 kobject_uevent(&kdev->kobj, KOBJ_ADD);
632
633 return 0;
Len Brown4f86d3a2007-10-03 18:58:00 -0400634}
635
636/**
637 * cpuidle_remove_sysfs - deletes a sysfs instance on the target device
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800638 * @dev: the target device
Len Brown4f86d3a2007-10-03 18:58:00 -0400639 */
Daniel Lezcano1aef40e2012-10-26 12:26:24 +0200640void cpuidle_remove_sysfs(struct cpuidle_device *dev)
Len Brown4f86d3a2007-10-03 18:58:00 -0400641{
Daniel Lezcano728ce222013-06-12 15:08:51 +0200642 struct cpuidle_device_kobj *kdev = dev->kobj_dev;
643
644 kobject_put(&kdev->kobj);
645 wait_for_completion(&kdev->kobj_unregister);
646 kfree(kdev);
Len Brown4f86d3a2007-10-03 18:58:00 -0400647}