From 79472132f555ae1e912699e116e5c82f338872f6 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Tue, 6 Dec 2005 15:33:15 -0800 Subject: [PATCH] [PATCH] I2C: move i2c-dev to use dynamic class devices 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 Cc: Jean Delvare --- drivers/i2c/i2c-dev.c | 50 +++++++++++++++++-------------------------- 1 file changed, 20 insertions(+), 30 deletions(-) diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index e140dd7d6a..ad6e04fc2c 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -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"); } -- 2.39.5