linux-kernel - Re: [linux-usb-devel] [RFC] USB: driver for iphone charging

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Message-ID: <20070824183548.GA14879@kroah.com>
Date:	Fri, 24 Aug 2007 11:35:48 -0700
From:	Greg KH <greg@...ah.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Oliver Neukum <oliver@...kum.org>, Matt Colyer <matt@...yer.name>,
	linux-kernel@...r.kernel.org, jeffm@...e.de,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: [linux-usb-devel] [RFC] USB: driver for iphone charging

On Fri, Aug 24, 2007 at 10:08:46AM -0400, Alan Stern wrote:
> On Fri, 24 Aug 2007, Oliver Neukum wrote:
> 
> > This schedules the change via a workqueue, so you'll be reprobed. If you
> > fire of the first vendor command you are doing so before the configuration
> > is changed. How is this supposed to work?
> 
> I would do it like this:
> 
> static int iphone_probe(struct usb_interface *intf,
> 			const struct usb_device_id *id)
> {
> 	struct usb_device *udev = interface_to_usbdev(intf);
> 	int rc;
> 
> 	if (udev->actconfig->desc.bConfigurationValue != 3) {
> 		dbg(&udev->dev, "Calling set_configuration\n");
> 		rc = usb_driver_set_configuration(udev, 3);
> 	} else {
> 		dbg(&udev->dev, "Configuration set, sending magic comand\n");
> 		rc = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
> 				0x40, (USB_DIR_OUT | USB_TYPE_VENDOR |
> 					USB_RECIP_DEVICE),
> 				0x6400, 0, NULL, 0, 1000);
> 	}
> 	if (rc)
> 		dev_err(&udev->dev, "Command failed: %d\n", rc);
> 
> 	/* we don't really want to bind to the device, userspace programs can
> 	 * handle the syncing just fine, so get outta here. */
> 	return -ENODEV;
> }

Yeah, that would make more sense, if that is what is needed.

Can someone with a iphone test this out?  If you look at how the
berry_charge driver does it, the set_config stuff happens after the
magic command.  As I don't have an iphone, nor have I ever seen any
dumps of the command streams, I don't really know if the set_config
message really is necessary or not.

thanks,

greg k-h
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