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i2c: Migration aids for i2c_adapter.dev removal

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Flag i2c_adapter.dev for removal after userspace tools get upgraded, and
include a near-term code migration aid to facilitate this:

 - The class device gets the name attribute it should have had.  This
   was previously (wrongly) associated with the i2c_adapter.dev node.
   Sysfs based tools and libraries can start converting right away.

 - Issue a warning for legacy adapter drivers that don't provide any
   physical device node; so systems with those drivers will know to
   fix this problem earlier.

This is one of a series of patches to help the I2C stack become a better
citizen of the Linux Driver Model world.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
David Brownell 2007-01-04 13:07:04 +01:00 committed by Jean Delvare
parent 999445d437
commit b119dc3f99
2 changed files with 41 additions and 4 deletions
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17
Documentation/feature-removal-schedule.txt
View File

@ -226,6 +226,23 @@ Who: Jean Delvare <khali@linux-fr.org>
---------------------------
What: i2c_adapter.dev
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.)
Who: Jean Delvare <khali@linux-fr.org>,
David Brownell <dbrownell@users.sourceforge.net>
---------------------------
What: IPv4 only connection tracking/NAT/helpers
When: 2.6.22
Why: The new layer 3 independant connection tracking replaces the old

28
drivers/i2c/i2c-core.c
View File

@ -95,16 +95,32 @@ struct device_driver i2c_adapter_driver = {
.bus = &i2c_bus_type,
};
/* ------------------------------------------------------------------------- */
/* 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",
.release = &i2c_adapter_class_dev_release,
.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)
@ -175,8 +191,12 @@ int i2c_add_adapter(struct i2c_adapter *adap)
* If the parent pointer is not set up,
* we add this adapter to the host bus.
*/
if (adap->dev.parent == NULL)
if (adap->dev.parent == NULL) {
adap->dev.parent = &platform_bus;
printk(KERN_WARNING "**WARNING** I2C adapter driver [%s] "
"forgot to specify physical device; fix it!\n",
adap->name);
}
sprintf(adap->dev.bus_id, "i2c-%d", adap->nr);
adap->dev.driver = &i2c_adapter_driver;
adap->dev.release = &i2c_adapter_dev_release;