[PATCH] Extend device_platform_driver macro
Uwe Kleine-König
u.kleine-koenig at pengutronix.de
Sat Mar 9 15:46:34 EST 2013
Hi,
On Sat, Mar 09, 2013 at 07:19:31PM +0400, Alexander Shiyan wrote:
> > On Fri, Mar 08, 2013 at 01:05:14PM +0400, Alexander Shiyan wrote:
> > > This patch extends device_platform_driver macro, so now we allow
> > > use it with various init levels and subsystems.
> > >
> > > Signed-off-by: Alexander Shiyan <shc_work at mail.ru>
> > > ---
> > > include/driver.h | 17 ++++++++++-------
> > > 1 file changed, 10 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/include/driver.h b/include/driver.h
> > > index 46c56c0..b891f80 100644
> > > --- a/include/driver.h
> > > +++ b/include/driver.h
> > > @@ -395,16 +395,19 @@ extern struct bus_type platform_bus;
> > >
> > > int platform_driver_register(struct driver_d *drv);
> > >
> > > -/* device_platform_driver() - Helper macro for drivers that don't do
> > > +/* register_driver_macro() - Helper macro for drivers that don't do
> > > * anything special in module registration. This eliminates a lot of
> > > * boilerplate. Each module may only use this macro once.
> > > */
> > > -#define device_platform_driver(drv) \
> > > - static int __init drv ## _register(void) \
> > > - { \
> > > - return platform_driver_register(&drv); \
> > > - } \
> > > - device_initcall(drv ## _register)
> > > +#define register_driver_macro(level,subsystem,drv) \
> > > + static int __init drv##_register(void) \
> > > + { \
> > > + return subsystem##_driver_register(&drv); \
> > > + } \
> > > + level##_initcall(drv##_register)
> >
> > So the usage would look like:
> >
> > register_driver_macro(device, i2c, &mc_driver)
> >
> > ?
> >
> > I'm not sure if I like this. I'm a bit concerned about being able
> > to grep for for example i2c_register_driver. This would become
> >
> > wcgrep register_driver_macro | grep i2c
> >
> > or similar.
>
> You are skip 2 important lines:
> #define device_platform_driver(drv) \
> register_driver_macro(device,platform,drv)
>
> For i2c we can define new macro like this:
> #define device_i2c_driver(drv) \
> register_driver_macro(device,i2c,drv)
>
> then use device_i2c_driver(&foo) in the driver.
I like the idea. Alexander, what is your motivation? Maybe offer a patch
series that first contains this patch and then in a later patch
introduces a nice usage.
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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