linux-kernel - Re: [PATCH v3] gpio: add Intel Moorestown Platform Langwell chip gpio driver

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Message-ID: <20090731170210.3372ca73@dxy.sh.intel.com>
Date:	Fri, 31 Jul 2009 17:02:10 +0800
From:	Alek Du <alek.du@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	David Brownell <david-b@...bell.net>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: Re: [PATCH v3] gpio: add Intel Moorestown Platform Langwell chip
 gpio driver

Andrew,

Sorry for late response. Yes, you are right, there is no meaning to build it as module, it should be changed to bool.
I will submit a new patch soon, I also need a mask handler to irqchip .... otherwise the free_irq will report a error.

Thanks,
Alek




On Thu, 30 Jul 2009 18:59:41 +0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Fri, 3 Jul 2009 21:07:06 +0800 Alek Du <alek.du@...el.com> wrote:
> 
> > Changes from v2:
> > 1. Add missed MODULE_DEVICE_TABLE
> > 
> > Changes from v1:
> > 1. driver name changed from lnw.c ==> langwell_gpio.c
> > 2. removed hard coded driver data, now we get it from PCI bar1 (platform init code fills it)
> > 3. removed alternative function setting code, it should be called in platform init part.
> > 4. misc. style clean
> > 
> > 
> > >From 8eaad3aac8cffda193adcfc4b9fcbb7c461fd4b9 Mon Sep 17 00:00:00 2001
> > From: Alek Du <alek.du@...el.com>
> > Date: Tue, 30 Jun 2009 12:13:27 +0800
> > Subject: [PATCH] gpio: add Intel Moorestown Platform Langwell chip gpio driver
> > 
> > The Langwell chip is the IO hub for Intel Moorestown platform which has a
> > 64-pin gpio block device inside. It is exposed as a dedicated PCI device.
> > We use it to control outside peripheral as well as to do IRQ demuxing. The
> > gpio block uses MSI to send level type interrupt to IOAPIC.
> 
> The driver breaks the x86-64 allmodconfig build:
> 
> ERROR: "irq_to_desc" [drivers/gpio/langwell_gpio.ko] undefined!
> ERROR: "set_irq_chip_and_handler_name" [drivers/gpio/langwell_gpio.ko] undefined!
> ERROR: "handle_simple_irq" [drivers/gpio/langwell_gpio.ko] undefined!
> 
> Does it make any sense to build this driver as a module?  If not, it
> should be changed to def_bool.  If so...
> 
> 
> 
>  kernel/irq/chip.c   |    2 ++
>  kernel/irq/handle.c |    1 +
>  2 files changed, 3 insertions(+)
> 
> diff -puN kernel/irq/handle.c~kernel-irq-export-symbols-needed-by-gpio-add-intel-moorestown-platform-langwell-chip-gpio-driverpatch kernel/irq/handle.c
> --- a/kernel/irq/handle.c~kernel-irq-export-symbols-needed-by-gpio-add-intel-moorestown-platform-langwell-chip-gpio-driverpatch
> +++ a/kernel/irq/handle.c
> @@ -192,6 +192,7 @@ struct irq_desc *irq_to_desc(unsigned in
>  
>  	return NULL;
>  }
> +EXPORT_SYMBOL(irq_to_desc);
>  
>  struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node)
>  {
> diff -puN kernel/irq/chip.c~kernel-irq-export-symbols-needed-by-gpio-add-intel-moorestown-platform-langwell-chip-gpio-driverpatch kernel/irq/chip.c
> --- a/kernel/irq/chip.c~kernel-irq-export-symbols-needed-by-gpio-add-intel-moorestown-platform-langwell-chip-gpio-driverpatch
> +++ a/kernel/irq/chip.c
> @@ -340,6 +340,7 @@ handle_simple_irq(unsigned int irq, stru
>  out_unlock:
>  	spin_unlock(&desc->lock);
>  }
> +EXPORT_SYMBOL(handle_simple_irq);
>  
>  /**
>   *	handle_level_irq - Level type irq handler
> @@ -609,6 +610,7 @@ set_irq_chip_and_handler_name(unsigned i
>  	set_irq_chip(irq, chip);
>  	__set_irq_handler(irq, handle, 0, name);
>  }
> +EXPORT_SYMBOL(set_irq_chip_and_handler_name);
>  
>  void __init set_irq_noprobe(unsigned int irq)
>  {
> _
> 
> 
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