3  * Generic Counter interface
7 #include <linux/counter.h>
22 #include "counter-chrdev.h"
23 #include "counter-sysfs.h"
25 #define COUNTER_NAME	"counter"
27 /* Provides a unique ID for each counter device */
31 	struct counter_device counter;  member
43 	struct counter_device *const counter =  in counter_device_release()  local
46 	counter_chrdev_remove(counter);  in counter_device_release()
49 	kfree(container_of(counter, struct counter_device_allochelper, counter));  in counter_device_release()
58 	.name = "counter",
59 	.dev_name = "counter",
65  * counter_priv - access counter device private data
66  * @counter: counter device
68  * Get the counter device private data
70 void *counter_priv(const struct counter_device *const counter)  in counter_priv()  argument
73 		container_of(counter, struct counter_device_allochelper, counter);  in counter_priv()
77 EXPORT_SYMBOL_NS_GPL(counter_priv, "COUNTER");
83  * This is part one of counter registration. The structure is allocated
91 	struct counter_device *counter;  in counter_alloc()  local
99 	counter = &ch->counter;  in counter_alloc()
100 	dev = &counter->dev;  in counter_alloc()
108 	mutex_init(&counter->ops_exist_lock);  in counter_alloc()
113 	err = counter_chrdev_add(counter);  in counter_alloc()
123 	return counter;  in counter_alloc()
127 	counter_chrdev_remove(counter);  in counter_alloc()
137 EXPORT_SYMBOL_NS_GPL(counter_alloc, "COUNTER");
139 void counter_put(struct counter_device *counter)  in counter_put()  argument
141 	put_device(&counter->dev);  in counter_put()
143 EXPORT_SYMBOL_NS_GPL(counter_put, "COUNTER");
146  * counter_add - complete registration of a counter
147  * @counter: the counter to add
149  * This is part two of counter registration.
153 int counter_add(struct counter_device *counter)  in counter_add()  argument
156 	struct device *dev = &counter->dev;  in counter_add()
158 	if (counter->parent) {  in counter_add()
159 		dev->parent = counter->parent;  in counter_add()
160 		dev->of_node = counter->parent->of_node;  in counter_add()
163 	err = counter_sysfs_add(counter);  in counter_add()
168 	return cdev_device_add(&counter->chrdev, dev);  in counter_add()
170 EXPORT_SYMBOL_NS_GPL(counter_add, "COUNTER");
173  * counter_unregister - unregister Counter from the system
174  * @counter:	pointer to Counter to unregister
176  * The Counter is unregistered from the system.
178 void counter_unregister(struct counter_device *const counter)  in counter_unregister()  argument
180 	if (!counter)  in counter_unregister()
183 	cdev_device_del(&counter->chrdev, &counter->dev);  in counter_unregister()
185 	mutex_lock(&counter->ops_exist_lock);  in counter_unregister()
187 	counter->ops = NULL;  in counter_unregister()
188 	wake_up(&counter->events_wait);  in counter_unregister()
190 	mutex_unlock(&counter->ops_exist_lock);  in counter_unregister()
192 EXPORT_SYMBOL_NS_GPL(counter_unregister, "COUNTER");
194 static void devm_counter_release(void *counter)  in devm_counter_release()  argument
196 	counter_unregister(counter);  in devm_counter_release()
199 static void devm_counter_put(void *counter)  in devm_counter_put()  argument
201 	counter_put(counter);  in devm_counter_put()
214 	struct counter_device *counter;  in devm_counter_alloc()  local
217 	counter = counter_alloc(sizeof_priv);  in devm_counter_alloc()
218 	if (!counter)  in devm_counter_alloc()
221 	err = devm_add_action_or_reset(dev, devm_counter_put, counter);  in devm_counter_alloc()
225 	return counter;  in devm_counter_alloc()
227 EXPORT_SYMBOL_NS_GPL(devm_counter_alloc, "COUNTER");
230  * devm_counter_add - complete registration of a counter
232  * @counter: the counter to add
238 		     struct counter_device *const counter)  in devm_counter_add()  argument
242 	err = counter_add(counter);  in devm_counter_add()
246 	return devm_add_action_or_reset(dev, devm_counter_release, counter);  in devm_counter_add()
248 EXPORT_SYMBOL_NS_GPL(devm_counter_add, "COUNTER");
282 MODULE_DESCRIPTION("Generic Counter interface");