linux-kernel - Re: [PATCH 1/8] staging/comedi: Add macro for registering a comedi PCMCIA driver

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Message-ID: <50F3E9CE.8060005@mev.co.uk>
Date:	Mon, 14 Jan 2013 11:19:42 +0000
From:	Ian Abbott <abbotti@....co.uk>
To:	Peter Huewe <peterhuewe@....de>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Ian Abbott <ian.abbott@....co.uk>,
	Mori Hess <fmhess@...rs.sourceforge.net>,
	YAMANE Toshiaki <yamanetoshi@...il.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/8] staging/comedi: Add macro for registering a comedi
 PCMCIA driver

On 2013-01-13 02:11, Peter Huewe wrote:
> This patch introduces a new macro 'module_comedi_pcmcia_driver'
> for comedi PCMCIA drivers which do not do anything special in module
> init/exit. This eliminates a lot of boilerplate.
>
> Adapted from 'module_comedi_pci_driver'
>
> Signed-off-by: Peter Huewe <peterhuewe@....de>
> ---
>   drivers/staging/comedi/comedidev.h |   22 ++++++++++++++++++++++
>   drivers/staging/comedi/drivers.c   |   34 ++++++++++++++++++++++++++++++++++
>   2 files changed, 56 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
> index 692e1e6..ccb22dd 100644
> --- a/drivers/staging/comedi/comedidev.h
> +++ b/drivers/staging/comedi/comedidev.h
> @@ -41,6 +41,9 @@
>   #include <linux/io.h>
>   #include <linux/timer.h>
>   #include <linux/pci.h>
> +#include <pcmcia/cistpl.h>
> +#include <pcmcia/cisreg.h>
> +#include <pcmcia/ds.h>

Do you need all those #includes?  Perhaps you could just have an 
incomplete declaration of struct pcmcia_driver as follows:

struct pcmcia_driver;

comedidev.h already does the same thing for struct usb_driver.

>   #include <linux/usb.h>
>
>   #include "comedi.h"
> @@ -342,6 +345,25 @@ void comedi_pci_driver_unregister(struct comedi_driver *, struct pci_driver *);
>   	module_driver(__comedi_driver, comedi_pci_driver_register, \
>   			comedi_pci_driver_unregister, &(__pci_driver))
>
> +int comedi_pcmcia_driver_register(struct comedi_driver *,
> +					struct pcmcia_driver *);
> +void comedi_pcmcia_driver_unregister(struct comedi_driver *,
> +					struct pcmcia_driver *);
> +
> +/**
> + * module_comedi_pcmcia_driver() - Helper macro for registering a comedi PCMCIA driver
> + * @__comedi_driver: comedi_driver struct
> + * @__pcmcia_driver: pcmcia_driver struct
> + *
> + * Helper macro for comedi PCMCIA drivers which do not do anything special
> + * in module init/exit. This eliminates a lot of boilerplate. Each
> + * module may only use this macro once, and calling it replaces
> + * module_init() and module_exit()
> + */
> +#define module_comedi_pcmcia_driver(__comedi_driver, __pcmcia_driver) \
> +	module_driver(__comedi_driver, comedi_pcmcia_driver_register, \
> +			comedi_pcmcia_driver_unregister, &(__pcmcia_driver))
> +
>   struct usb_driver;
>
>   int comedi_usb_driver_register(struct comedi_driver *, struct usb_driver *);
> diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c
> index 50cf498..17a9e35 100644
> --- a/drivers/staging/comedi/drivers.c
> +++ b/drivers/staging/comedi/drivers.c
> @@ -24,6 +24,9 @@
>   #include <linux/device.h>
>   #include <linux/module.h>
>   #include <linux/pci.h>
> +#include <pcmcia/cistpl.h>
> +#include <pcmcia/cisreg.h>
> +#include <pcmcia/ds.h>
>   #include <linux/usb.h>
>   #include <linux/errno.h>
>   #include <linux/kconfig.h>
> @@ -958,6 +961,37 @@ void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
>   }
>   EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);
>
> +int comedi_pcmcia_driver_register(struct comedi_driver *comedi_driver,
> +		struct pcmcia_driver *pcmcia_driver)
> +{
> +	int ret;
> +
> +	ret = comedi_driver_register(comedi_driver);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* FIXME: Remove this test after auditing all comedi pci drivers */

That comment was cut-n-pasted, but needs editing for PCMCIA!

> +	if (!pcmcia_driver->name)
> +		pcmcia_driver->name = comedi_driver->driver_name;
> +
> +	ret = pcmcia_register_driver(pcmcia_driver);
> +	if (ret < 0) {
> +		comedi_driver_unregister(comedi_driver);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_register);
> +
> +void comedi_pcmcia_driver_unregister(struct comedi_driver *comedi_driver,
> +		struct pcmcia_driver *pcmcia_driver)
> +{
> +	pcmcia_unregister_driver(pcmcia_driver);
> +	comedi_driver_unregister(comedi_driver);
> +}
> +EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_unregister);
> +

I'm pretty sure you'll need to enclose the above function definitions 
form comedi_pcmcia_driver_register() and 
comedi_pcmcia_driver_unregister() with the lines

#if IS_ENABLED(CONFIG_PCMCIA)

...

#endif

Otherwise it will fail to compile when PCMCIA is disabled in the kernel 
config.  (This was also necessary for USB.)

>   #if IS_ENABLED(CONFIG_USB)
>
>   int comedi_usb_driver_register(struct comedi_driver *comedi_driver,
>

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
--
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