Hi, > Calls to dbg() or warn() or info() would get replaced with > calls to dev_dbg() or dev_warn() or dev_info() etc ... adding > a newline at the end of the string), passing the struct device > from the usb interface as the first parameter.
I've been looking at the code in hid-core.c to see how I can best go about to do this, and found that I'm somewhat confused by the following. My guess is that hid_probe() is the entry point into the calling tree, and it in turn calls usb_hid_configure(). (passing on the intf pointer which I should be able to dereference to get the device pointer). However, then it calls hid_parse_report(), without passing on the intf pointer, and thus it is losing the reference to the device struct. From hid_parse_report() the different parsers hid_parse_main(), hid_parse_global() and hid_parse_local() are called, which contain some dbg() messages, but from there the device is not reachable since as far as I can tell, in hid_parse_report() the reference device->intf is not initialised... Is there still a way to get access to the device? Or could I simply pass the intf pointer from usb_hid_configure() to hid_parse_report() and there assign it to device->intf so it can be dereferenced later? Or would that cause problems elsewhere? What I'd like to do in hid_parse_local(): dev_dbg(parser->device->intf->dev, "item data expected for local item"); And in open_collection(): dev_dbg(parser->device->intf->dev, "collection stack overflow"); And in hid_add_field(): dev_dbg(parser->device->intf->dev, "hid_register_report failed"); And in hid_register_field(): dev_dbg(report->device->intf->dev, "too many fields in report"); At the same time I'm also wondering if it is safe to assume that followin the hid->intf->dev is valid when hid_wait_io() is called from the outside. I'm completely new in this area, so I'm really clueless, and any clarifications or hint/tips are very much appreciated. I'd very much like to know wether I'm on the right track here ;-) Warm regards, Mark. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_ide95&alloc_id396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
