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i2c: Kill i2c_adapter.class_dev 

Kill i2c_adapter.class_dev. Instead, set the class of i2c_adapter.dev
to i2c_adapter_class, so that a symlink will be created for every
i2c_adapter in /sys/class/i2c-adapter.

The same change must be mirrored to i2c-isa as it duplicates some
of the i2c-core functionalities.

User-space tools and libraries might need some adjustments. In
particular, libsensors from lm_sensors 2.10.3 or later is required for
proper discovery of i2c adapter names after this change.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2007-05-01 23:26:27 +02:00 committed by Jean Delvare
parent dc87c3985e
commit fccb56e4d8
4 changed files with 5 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
Documentation/feature-removal-schedule.txt
View File

@ -190,18 +190,10 @@ Who: Jean Delvare <khali@linux-fr.org>
---------------------------
What: i2c_adapter.dev
i2c_adapter.list
What: i2c_adapter.list
When: July 2007
Why: Superfluous, given i2c_adapter.class_dev:
* The "dev" was a stand-in for the physical device node that legacy
drivers would not have; but now it's almost always present. Any
remaining legacy drivers must upgrade (they now trigger warnings).
* The "list" duplicates class device children.
The delay in removing this is so upgraded lm_sensors and libsensors
can get deployed. (Removal causes minor changes in the sysfs layout,
notably the location of the adapter type name and parenting the i2c
client hardware directly from their controller.)
Why: Superfluous, this list duplicates the one maintained by the driver
core.
Who: Jean Delvare <khali@linux-fr.org>,
David Brownell <dbrownell@users.sourceforge.net>

18
drivers/i2c/busses/i2c-isa.c
View File

@ -141,6 +141,7 @@ static int __init i2c_isa_init(void)
sprintf(isa_adapter.dev.bus_id, "i2c-%d", isa_adapter.nr);
isa_adapter.dev.driver = &i2c_adapter_driver;
isa_adapter.dev.release = &i2c_adapter_dev_release;
isa_adapter.dev.class = &i2c_adapter_class;
err = device_register(&isa_adapter.dev);
if (err) {
printk(KERN_ERR "i2c-isa: Failed to register device\n");
@ -152,24 +153,10 @@ static int __init i2c_isa_init(void)
goto exit_unregister;
}
/* Add this adapter to the i2c_adapter class */
memset(&isa_adapter.class_dev, 0x00, sizeof(struct class_device));
isa_adapter.class_dev.dev = &isa_adapter.dev;
isa_adapter.class_dev.class = &i2c_adapter_class;
strlcpy(isa_adapter.class_dev.class_id, isa_adapter.dev.bus_id,
BUS_ID_SIZE);
err = class_device_register(&isa_adapter.class_dev);
if (err) {
printk(KERN_ERR "i2c-isa: Failed to register class device\n");
goto exit_remove_name;
}
dev_dbg(&isa_adapter.dev, "%s registered\n", isa_adapter.name);
return 0;
exit_remove_name:
device_remove_file(&isa_adapter.dev, &dev_attr_name);
exit_unregister:
init_completion(&isa_adapter.dev_released); /* Needed? */
device_unregister(&isa_adapter.dev);
@ -201,15 +188,12 @@ static void __exit i2c_isa_exit(void)
/* Clean up the sysfs representation */
dev_dbg(&isa_adapter.dev, "Unregistering from sysfs\n");
init_completion(&isa_adapter.dev_released);
init_completion(&isa_adapter.class_dev_released);
class_device_unregister(&isa_adapter.class_dev);
device_remove_file(&isa_adapter.dev, &dev_attr_name);
device_unregister(&isa_adapter.dev);
/* Wait for sysfs to drop all references */
dev_dbg(&isa_adapter.dev, "Waiting for sysfs completion\n");
wait_for_completion(&isa_adapter.dev_released);
wait_for_completion(&isa_adapter.class_dev_released);
dev_dbg(&isa_adapter.dev, "%s unregistered\n", isa_adapter.name);
}

34
drivers/i2c/i2c-core.c
View File

@ -123,28 +123,9 @@ struct device_driver i2c_adapter_driver = {
/* I2C bus adapters -- one roots each I2C or SMBUS segment */
static void i2c_adapter_class_dev_release(struct class_device *dev)
{
struct i2c_adapter *adap = class_dev_to_i2c_adapter(dev);
complete(&adap->class_dev_released);
}
static ssize_t i2c_adapter_show_name(struct class_device *cdev, char *buf)
{
struct i2c_adapter *adap = class_dev_to_i2c_adapter(cdev);
return sprintf(buf, "%s\n", adap->name);
}
static struct class_device_attribute i2c_adapter_attrs[] = {
__ATTR(name, S_IRUGO, i2c_adapter_show_name, NULL),
{ },
};
struct class i2c_adapter_class = {
.owner = THIS_MODULE,
.name = "i2c-adapter",
.class_dev_attrs = i2c_adapter_attrs,
.release = &i2c_adapter_class_dev_release,
};
static ssize_t show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf)
@ -223,6 +204,7 @@ int i2c_add_adapter(struct i2c_adapter *adap)
sprintf(adap->dev.bus_id, "i2c-%d", adap->nr);
adap->dev.driver = &i2c_adapter_driver;
adap->dev.release = &i2c_adapter_dev_release;
adap->dev.class = &i2c_adapter_class;
res = device_register(&adap->dev);
if (res)
goto out_list;
@ -230,15 +212,6 @@ int i2c_add_adapter(struct i2c_adapter *adap)
if (res)
goto out_unregister;
/* Add this adapter to the i2c_adapter class */
memset(&adap->class_dev, 0x00, sizeof(struct class_device));
adap->class_dev.dev = &adap->dev;
adap->class_dev.class = &i2c_adapter_class;
strlcpy(adap->class_dev.class_id, adap->dev.bus_id, BUS_ID_SIZE);
res = class_device_register(&adap->class_dev);
if (res)
goto out_remove_name;
dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
/* inform drivers of new adapters */
@ -253,8 +226,6 @@ out_unlock:
mutex_unlock(&core_lists);
return res;
out_remove_name:
device_remove_file(&adap->dev, &dev_attr_name);
out_unregister:
init_completion(&adap->dev_released); /* Needed? */
device_unregister(&adap->dev);
@ -314,15 +285,12 @@ int i2c_del_adapter(struct i2c_adapter *adap)
/* clean up the sysfs representation */
init_completion(&adap->dev_released);
init_completion(&adap->class_dev_released);
class_device_unregister(&adap->class_dev);
device_remove_file(&adap->dev, &dev_attr_name);
device_unregister(&adap->dev);
list_del(&adap->list);
/* wait for sysfs to drop all references */
wait_for_completion(&adap->dev_released);
wait_for_completion(&adap->class_dev_released);
/* free dynamically allocated bus id */
idr_remove(&i2c_adapter_idr, adap->nr);

3
include/linux/i2c.h
View File

@ -228,17 +228,14 @@ struct i2c_adapter {
int timeout;
int retries;
struct device dev; /* the adapter device */
struct class_device class_dev; /* the class device */
int nr;
struct list_head clients;
struct list_head list;
char name[I2C_NAME_SIZE];
struct completion dev_released;
struct completion class_dev_released;
};
#define dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
#define class_dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, class_dev)
static inline void *i2c_get_adapdata (struct i2c_adapter *dev)
{