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Subject[patch 08/28] Input: prepare to sysfs integration
Input: prepare to sysfs integration

Add struct class_device to input_dev; add input_allocate_dev()
to dynamically allocate input devices; dynamically allocated
devices are automatically registered with sysfs.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---
drivers/input/input.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++----
include/linux/input.h | 24 ++++++++++++++-
2 files changed, 95 insertions(+), 6 deletions(-)
Index: work/include/linux/input.h
===================================================================
--- work.orig/include/linux/input.h
+++ work/include/linux/input.h
@@ -12,6 +12,7 @@
#ifdef __KERNEL__
#include <linux/time.h>
#include <linux/list.h>
+#include <linux/device.h>
#else
#include <sys/time.h>
#include <sys/ioctl.h>
@@ -889,11 +890,15 @@ struct input_dev {
struct semaphore sem; /* serializes open and close operations */
unsigned int users;

- struct device *dev;
+ struct class_device cdev;
+ struct device *dev; /* will be removed soon */
+
+ int dynalloc; /* temporarily */

struct list_head h_list;
struct list_head node;
};
+#define to_input_dev(d) container_of(d, struct input_dev, cdev)

/*
* Structure for hotplug & device<->driver matching.
@@ -984,6 +989,23 @@ static inline void init_input_dev(struct
INIT_LIST_HEAD(&dev->node);
}

+struct input_dev *input_allocate_device(void);
+
+static inline void input_free_device(struct input_dev *dev)
+{
+ kfree(dev);
+}
+
+static inline struct input_dev *input_get_device(struct input_dev *dev)
+{
+ return to_input_dev(class_device_get(&dev->cdev));
+}
+
+static inline void input_put_device(struct input_dev *dev)
+{
+ class_device_put(&dev->cdev);
+}
+
void input_register_device(struct input_dev *);
void input_unregister_device(struct input_dev *);

Index: work/drivers/input/input.c
===================================================================
--- work.orig/drivers/input/input.c
+++ work/drivers/input/input.c
@@ -27,6 +27,7 @@ MODULE_AUTHOR("Vojtech Pavlik <vojtech@s
MODULE_DESCRIPTION("Input core");
MODULE_LICENSE("GPL");

+EXPORT_SYMBOL(input_allocate_device);
EXPORT_SYMBOL(input_register_device);
EXPORT_SYMBOL(input_unregister_device);
EXPORT_SYMBOL(input_register_handler);
@@ -604,6 +605,56 @@ static inline int input_proc_init(void)
static inline void input_proc_exit(void) { }
#endif

+static void input_dev_release(struct class_device *class_dev)
+{
+ struct input_dev *dev = to_input_dev(class_dev);
+
+ kfree(dev);
+ module_put(THIS_MODULE);
+}
+
+static struct class input_dev_class = {
+ .name = "input_dev",
+ .release = input_dev_release,
+};
+
+struct input_dev *input_allocate_device(void)
+{
+ struct input_dev *dev;
+
+ dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
+ if (dev) {
+ dev->dynalloc = 1;
+ dev->cdev.class = &input_dev_class;
+ class_device_initialize(&dev->cdev);
+ INIT_LIST_HEAD(&dev->h_list);
+ INIT_LIST_HEAD(&dev->node);
+ }
+
+ return dev;
+}
+
+static void input_register_classdevice(struct input_dev *dev)
+{
+ static atomic_t input_no = ATOMIC_INIT(0);
+ const char *path;
+
+ __module_get(THIS_MODULE);
+
+ dev->dev = dev->cdev.dev;
+
+ snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
+ "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
+
+ path = kobject_get_path(&dev->cdev.class->subsys.kset.kobj, GFP_KERNEL);
+ printk(KERN_INFO "input: %s/%s as %s\n",
+ dev->name ? dev->name : "Unspecified device",
+ path ? path : "", dev->cdev.class_id);
+ kfree(path);
+
+ class_device_add(&dev->cdev);
+}
+
void input_register_device(struct input_dev *dev)
{
struct input_handle *handle;
@@ -636,6 +687,10 @@ void input_register_device(struct input_
if ((handle = handler->connect(handler, dev, id)))
input_link_handle(handle);

+
+ if (dev->dynalloc)
+ input_register_classdevice(dev);
+
#ifdef CONFIG_HOTPLUG
input_call_hotplug("add", dev);
#endif
@@ -664,6 +719,9 @@ void input_unregister_device(struct inpu

list_del_init(&dev->node);

+ if (dev->dynalloc)
+ class_device_unregister(&dev->cdev);
+
input_wakeup_procfs_readers();
}

@@ -752,26 +810,34 @@ static int __init input_init(void)
{
int err;

+ err = class_register(&input_dev_class);
+ if (err) {
+ printk(KERN_ERR "input: unable to register input_dev class\n");
+ return err;
+ }
+
input_class = class_create(THIS_MODULE, "input");
if (IS_ERR(input_class)) {
printk(KERN_ERR "input: unable to register input class\n");
- return PTR_ERR(input_class);
+ err = PTR_ERR(input_class);
+ goto fail1;
}

err = input_proc_init();
if (err)
- goto fail1;
+ goto fail2;

err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
if (err) {
printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
- goto fail2;
+ goto fail3;
}

return 0;

- fail2: input_proc_exit();
- fail1: class_destroy(input_class);
+ fail3: input_proc_exit();
+ fail2: class_destroy(input_class);
+ fail1: class_unregister(&input_dev_class);
return err;
}

@@ -780,6 +846,7 @@ static void __exit input_exit(void)
input_proc_exit();
unregister_chrdev(INPUT_MAJOR, "input");
class_destroy(input_class);
+ class_unregister(&input_dev_class);
}

subsys_initcall(input_init);
-
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