On 02/02/11 19:21, Hennerich, Michael wrote:
> Jonathan Cameron wrote on 2011-02-02:
>> On 02/02/11 13:30, michael.hennerich@xxxxxxxxxx wrote:
>>> From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
>>>
>>> This patch adds a new trigger that can be invoked by writing the sysfs
>>> file: trigger_now. This approach can be valuable during automated
>>> testing or in situations, where other trigger methods are not
>>> applicable. For example no RTC or spare GPIOs. Last but not least we
>>> can allow user space applications to produce
>> triggers.
>> Excellent. Very handy for testing as you say.
>>
>> If we really want to commonly use this from userspace we will want a
>> means of registering more than one such trigger but this does fine for
>> test rigs. To do multiple triggers with this we could either just take
>> a module parameter or have a 'request_trigger' attribute under some
>> parent device.
>> Still that's a question for another day. The current functionality is
>> enough to be getting on with.
>
> Well - you can register as many triggers as you want.
> This is what platform_device.id is for.
Good point. I was clearly half asleep last night!
Thanks for the clarification.
Jonathan
>
> See example below -
>
> static struct platform_device iio_sysfs_trigger = {
> .name = "iio_sysfs_trigger",
> .id = 0,
> .dev = {
> .platform_data = NULL,
> },
> };
>
> static struct platform_device iio_sysfs_trigger1 = {
> .name = "iio_sysfs_trigger",
> .id = 1,
> .dev = {
> .platform_data = NULL,
> },
> };
>
>
> &bfin_dpmc,
>
> static struct platform_device *my_devices[] __initdata = {
>
> #if defined(CONFIG_IIO_SYSFS_TRIGGER) || defined(CONFIG_IIO_SYSFS_TRIGGER _MODULE)
> &iio_sysfs_trigger,
> &iio_sysfs_trigger1,
> #endif
> }
>
> In the driver use:
>
>> + trig->name = kasprintf(GFP_KERNEL, "sysfstrig%d", pdev->id);
>
> What the gpio trigger driver does is not necessary
> - it only replicates functionality already provided by the platform device bus.
>
> -Michael
>
>
> Greetings,
> Michael
>
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>
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