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

[Alek Du <alek.du@intel.com>]

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@linux-foundation.org> wrote:

> On Fri, 3 Jul 2009 21:07:06 +0800 Alek Du <alek.du@intel.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@intel.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)
>  {
> _
> 
>