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driver-core: platform: Provide helpers for multi-driver modules

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Some modules register several sub-drivers. Provide a helper that makes
it easy to register and unregister a list of sub-drivers, as well as
unwind properly on error.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thierry Reding
2015-09-25 17:29:04 +02:00
committed by Greg Kroah-Hartman
parent 7568fb63f5
commit dbe2256ddd
3 changed files with 83 additions and 0 deletions
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14
Documentation/driver-model/platform.txt
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@@ -63,6 +63,20 @@ runtime memory footprint:
int platform_driver_probe(struct platform_driver *drv,
int (*probe)(struct platform_device *))
Kernel modules can be composed of several platform drivers. The platform core
provides helpers to register and unregister an array of drivers:
int __platform_register_drivers(struct platform_driver * const *drivers,
unsigned int count, struct module *owner);
void platform_unregister_drivers(struct platform_driver * const *drivers,
unsigned int count);
If one of the drivers fails to register, all drivers registered up to that
point will be unregistered in reverse order. Note that there is a convenience
macro that passes THIS_MODULE as owner parameter:
#define platform_register_driver(drivers, count)
Device Enumeration
~~~~~~~~~~~~~~~~~~