Messages in this thread | | | From | Dmitry Torokhov <> | Subject | Re: [PATCH 2/7] Input: wacom - Get features from driver info | Date | Thu, 7 Jan 2010 11:06:30 -0800 |
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On Thursday 07 January 2010 10:29:36 am Bastian Blank wrote: > Get the features information from the driver info of the usb device id > structure provided by the caller. The device ids and feature structs > are strong coupled using indices. > > Signed-off-by: Bastian Blank <waldi@debian.org> > --- > drivers/input/tablet/wacom_sys.c | 6 ++++-- > 1 files changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/input/tablet/wacom_sys.c > b/drivers/input/tablet/wacom_sys.c index ab42c25..b0f3fc3 100644 > --- a/drivers/input/tablet/wacom_sys.c > +++ b/drivers/input/tablet/wacom_sys.c > @@ -532,7 +532,7 @@ static int wacom_probe(struct usb_interface *intf, > const struct usb_device_id *i struct usb_endpoint_descriptor *endpoint; > struct wacom *wacom; > struct wacom_wac *wacom_wac; > - struct wacom_features *features; > + struct wacom_features *features = (void *)id->driver_info;
What is this cast for?
> struct input_dev *input_dev; > int error = -ENOMEM; > > @@ -557,7 +557,9 @@ static int wacom_probe(struct usb_interface *intf, > const struct usb_device_id *i usb_make_path(dev, wacom->phys, > sizeof(wacom->phys)); > strlcat(wacom->phys, "/input0", sizeof(wacom->phys)); > > - wacom_wac->features = features = get_wacom_feature(id); > + if (!features) > + features = get_wacom_feature(id);
In which cases driver would not have driver_info set up?
> + wacom_wac->features = features; > BUG_ON(features->pktlen > WACOM_PKGLEN_MAX); > > input_dev->name = wacom_wac->features->name; >
-- Dmitry
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