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[PATCH] I2C: move i2c-dev to use dynamic class devices

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i2c-dev doesn't use the reference counting logic of struct class_device so move
it to the dynamic method.  This makes the code paths simpler and the driver
smaller.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Greg Kroah-Hartman 2005-12-06 15:33:15 -08:00
parent d82c0bf88f
commit 79472132f5
1 changed files with 20 additions and 30 deletions
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50
drivers/i2c/i2c-dev.c
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@ -42,8 +42,7 @@ static struct i2c_client i2cdev_client_template;
struct i2c_dev {
int minor;
struct i2c_adapter *adap;
struct class_device class_dev;
struct completion released; /* FIXME, we need a class_device_unregister() */
struct class_device *class_dev;
};
#define to_i2c_dev(d) container_of(d, struct i2c_dev, class_dev)
@ -105,7 +104,10 @@ static void return_i2c_dev(struct i2c_dev *i2c_dev)
static ssize_t show_adapter_name(struct class_device *class_dev, char *buf)
{
struct i2c_dev *i2c_dev = to_i2c_dev(class_dev);
struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(class_dev->devt));
if (!i2c_dev)
return -ENODEV;
return sprintf(buf, "%s\n", i2c_dev->adap->name);
}
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
@ -408,21 +410,12 @@ static struct file_operations i2cdev_fops = {
.release = i2cdev_release,
};
static void release_i2c_dev(struct class_device *dev)
{
struct i2c_dev *i2c_dev = to_i2c_dev(dev);
complete(&i2c_dev->released);
}
static struct class i2c_dev_class = {
.name = "i2c-dev",
.release = &release_i2c_dev,
};
static struct class *i2c_dev_class;
static int i2cdev_attach_adapter(struct i2c_adapter *adap)
{
struct i2c_dev *i2c_dev;
int retval;
struct device *dev;
i2c_dev = get_free_i2c_dev(adap);
if (IS_ERR(i2c_dev))
@ -434,21 +427,20 @@ static int i2cdev_attach_adapter(struct i2c_adapter *adap)
/* register this i2c device with the driver core */
i2c_dev->adap = adap;
if (adap->dev.parent == &platform_bus)
i2c_dev->class_dev.dev = &adap->dev;
dev = &adap->dev;
else
i2c_dev->class_dev.dev = adap->dev.parent;
i2c_dev->class_dev.class = &i2c_dev_class;
i2c_dev->class_dev.devt = MKDEV(I2C_MAJOR, i2c_dev->minor);
snprintf(i2c_dev->class_dev.class_id, BUS_ID_SIZE, "i2c-%d", i2c_dev->minor);
retval = class_device_register(&i2c_dev->class_dev);
if (retval)
dev = adap->dev.parent;
i2c_dev->class_dev = class_device_create(i2c_dev_class, NULL,
MKDEV(I2C_MAJOR, i2c_dev->minor),
dev, "i2c-%d", i2c_dev->minor);
if (!i2c_dev->class_dev)
goto error;
class_device_create_file(&i2c_dev->class_dev, &class_device_attr_name);
class_device_create_file(i2c_dev->class_dev, &class_device_attr_name);
return 0;
error:
return_i2c_dev(i2c_dev);
kfree(i2c_dev);
return retval;
return -ENODEV;
}
static int i2cdev_detach_adapter(struct i2c_adapter *adap)
@ -459,10 +451,8 @@ static int i2cdev_detach_adapter(struct i2c_adapter *adap)
if (!i2c_dev)
return -ENODEV;
init_completion(&i2c_dev->released);
return_i2c_dev(i2c_dev);
class_device_unregister(&i2c_dev->class_dev);
wait_for_completion(&i2c_dev->released);
class_device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, i2c_dev->minor));
kfree(i2c_dev);
pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name);
@ -507,8 +497,8 @@ static int __init i2c_dev_init(void)
if (res)
goto out;
res = class_register(&i2c_dev_class);
if (res)
i2c_dev_class = class_create(THIS_MODULE, "i2c-dev");
if (IS_ERR(i2c_dev_class))
goto out_unreg_chrdev;
res = i2c_add_driver(&i2cdev_driver);
@ -518,7 +508,7 @@ static int __init i2c_dev_init(void)
return 0;
out_unreg_class:
class_unregister(&i2c_dev_class);
class_destroy(i2c_dev_class);
out_unreg_chrdev:
unregister_chrdev(I2C_MAJOR, "i2c");
out:
@ -529,7 +519,7 @@ out:
static void __exit i2c_dev_exit(void)
{
i2c_del_driver(&i2cdev_driver);
class_unregister(&i2c_dev_class);
class_destroy(i2c_dev_class);
unregister_chrdev(I2C_MAJOR,"i2c");
}