When "probe" is called?

[Joy Sun]

Thanks, Anish,

However, could you point me out where the kernel actually detects the
device? Is it keep polling with the driver's name which was given at compile
time? Or Is there other mechanism to detect the device? Basically, how the
kernel detects those devices, which calls "probe"?

-J

On Sun, Feb 6, 2011 at 11:29 PM, anish singh <anish198519851985 at gmail.com>wrote:

> Hi,
>>
>> I am seeing probe function pointer and know the procedure to register of
>> it for a specific device driver. However, I wonder when it is actually
>> called?
>>
>> For example, for platform drivers, there is a structure like this:
>>
>> struct platform_driver {
>>  int (*probe)(struct platform_device *);
>>  int (*remove)(struct platform_device *);
>>  void (*shutdown)(struct platform_device *);
>>  int (*suspend)(struct platform_device *, pm_message_t state);
>>  int (*suspend_late)(struct platform_device *, pm_message_t state);
>>  int (*resume_early)(struct platform_device *);
>>  int (*resume)(struct platform_device *);
>>  struct device_driver driver;
>> };
>>
>>
>> Then, it is registered by
>>
>> int platform_driver_register(struct platform_driver *drv);
>>
>> But, I wonder when actually, those functions (especially, probe) are
>> called. Could you guide me about it, please?
>
> AFAIK probe is called when your device is recognized by the
> platform.Generally registering the device requires the device name and this
> device name is compared with the driver name(when you are registering the
> driver you would be specifying the driver name,which should match with the
> device name).
> Once the device gets detected by the kernel it will call the corresponding
> driver probe for that device.
>
>>
>> Thanks,
>>
>> -J.
>>
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>
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