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| author | Bastien Nocera <hadess@hadess.net> | 2019-10-16 11:39:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-12 11:01:54 -0800 |
| commit | c9d503370f240934f3c1c5da4c6c2452a7d05db2 (patch) | |
| tree | 92803ca7729f1ef26bc69542c96ee29850fd1815 /drivers/usb/core/driver.c | |
| parent | ef0f7d1877ac21fd926f2349e6a025c201651cf7 (diff) | |
| download | linux-c9d503370f240934f3c1c5da4c6c2452a7d05db2.tar.gz linux-c9d503370f240934f3c1c5da4c6c2452a7d05db2.tar.bz2 linux-c9d503370f240934f3c1c5da4c6c2452a7d05db2.zip | |
USB: Make it possible to "subclass" usb_device_driver
The kernel currenly has only 2 usb_device_drivers, one generic one, one
that completely replaces the generic one to make USB devices usable over
a network.
Use the newly exported generic driver functions when a driver declares
to want them run, in addition to its own code. This makes it possible to
write drivers that extend the generic USB driver.
Note that this patch is not enough for another driver to automatically
get selected.
Signed-off-by: Bastien Nocera <hadess@hadess.net>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20191016093933.693-3-hadess@hadess.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/driver.c')
| -rw-r--r-- | drivers/usb/core/driver.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 2b27d232d7a7..d3787d084937 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -261,9 +261,16 @@ static int usb_probe_device(struct device *dev) */ if (!udriver->supports_autosuspend) error = usb_autoresume_device(udev); + if (error) + return error; - if (!error) - error = udriver->probe(udev); + if (udriver->generic_subclass) + error = usb_generic_driver_probe(udev); + if (error) + return error; + + error = udriver->probe(udev); + /* TODO: fallback to generic driver in case of error */ return error; } @@ -273,7 +280,10 @@ static int usb_unbind_device(struct device *dev) struct usb_device *udev = to_usb_device(dev); struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); - udriver->disconnect(udev); + if (udriver->disconnect) + udriver->disconnect(udev); + if (udriver->generic_subclass) + usb_generic_driver_disconnect(udev); if (!udriver->supports_autosuspend) usb_autosuspend_device(udev); return 0; @@ -1149,7 +1159,10 @@ static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) udev->do_remote_wakeup = 0; udriver = &usb_generic_driver; } - status = udriver->suspend(udev, msg); + if (udriver->suspend) + status = udriver->suspend(udev, msg); + if (status == 0 && udriver->generic_subclass) + status = usb_generic_driver_suspend(udev, msg); done: dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); @@ -1181,7 +1194,10 @@ static int usb_resume_device(struct usb_device *udev, pm_message_t msg) udev->reset_resume = 1; udriver = to_usb_device_driver(udev->dev.driver); - status = udriver->resume(udev, msg); + if (udriver->generic_subclass) + status = usb_generic_driver_resume(udev, msg); + if (status == 0 && udriver->resume) + status = udriver->resume(udev, msg); done: dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |