linux-kernel - Re: [PATCH 0/3] drivers:staging:ti-st: patches

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Date:	Fri, 23 Jul 2010 10:26:18 +0530
From:	Pavan Savoy <pavan_savoy@...y.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	gregkh@...e.de, alan@...rguk.ukuu.org.uk,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH 0/3] drivers:staging:ti-st: patches

Randy,

On Fri, Jul 23, 2010 at 1:23 AM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> On Thu, 22 Jul 2010 05:32:04 -0500 pavan_savoy@...com wrote:
>
>> From: Pavan Savoy <pavan_savoy@...com>
>>
>> The following patches cleanup bit of a mess and also adds functionality to protocol drivers.
>> with the 3rd patch now providing context to even the protocol drivers, the single device limit
>> or support for multiple devices would be easier to implement.
>>
>> These patches depend on the previously submitted
>> 0001-drivers-staging-ti-st-make-use-of-linux-err-codes.patch
>> commit d39d49b393d94f4137cee4f64526a4695352f183
>>
>> Pavan Savoy (3):
>>   drivers:staging:ti-st: smarten, reduce logs
>>   drivers:staging:ti-st: cleanup code comments
>>   drivers:staging:ti-st: give proto drivers context
>>
>>  drivers/staging/ti-st/bt_drv.c  |   23 +++++---
>>  drivers/staging/ti-st/st.h      |   52 +++++++++--------
>>  drivers/staging/ti-st/st_core.c |  118 +++++++++++++++++++--------------------
>>  drivers/staging/ti-st/st_core.h |   74 +++++++++++++++++--------
>>  drivers/staging/ti-st/st_kim.c  |   73 ++++++++++++++----------
>>  drivers/staging/ti-st/st_kim.h  |   77 ++++++++++++++++---------
>>  drivers/staging/ti-st/st_ll.c   |    4 +-
>>  drivers/staging/ti-st/st_ll.h   |    9 +++-
>>  8 files changed, 255 insertions(+), 175 deletions(-)
>
> Hi,
>
> I have reported this error a few times.  Where is the patch for it??
>
> ERROR: "st_get_plat_device" [drivers/staging/ti-st/st_drv.ko] undefined!


Yes, on one of the earlier patch sets, I had mentioned that the ST
driver being a platform device, needs definition in any of the
arch/XX/mach-XX/board-XX.c or devices.c or somewhere...

and hence it is in that board-XX.c file that the symbol
st_get_plat_device needs to be exported, the reason for that being,

ST driver being both a TTY ldisc driver and platform driver, in TTY
contexts it would need to refer to platform driver's data. So it does
a st_get_plat_device which returns the platform device structure, and
then does a dev_getdrvdata from it.

here's a snippet of code ...
/*
 * ST related functions related functions
 */
#include <linux/platform_device.h>

long gpios[] = { 55, -1, -1 };
static struct platform_device ti_st_device = {
        .name           = "kim",
        .id             = -1,
        .dev.platform_data      = &gpios,
};

struct platform_device *st_get_plat_device(void)
{
        return &ti_st_device;
}
EXPORT_SYMBOL(st_get_plat_device);

static __init int add_ti_st_device(void)
{
        platform_device_register(&ti_st_device);
        dev_info(&ti_st_device.dev,"registered platform TI ST device\n");

        return 0;
}
device_initcall(add_ti_st_device);


We have that in our local trees in arch/arm/mach-omap2/board-sdp4430.c

>
> thanks,
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
>
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