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From: Alan Stern <stern@rowland.harvard.edu>
To: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Hans de Goede <hdegoede@redhat.com>, <linux-usb@vger.kernel.org>,
	Sarah Sharp <sarah.a.sharp@linux.intel.com>,
	<linux-media@vger.kernel.org>,
	<libusb-devel@lists.sourceforge.net>,
	Alexander Graf <agraf@suse.de>, Gerd Hoffmann <kraxel@redhat.com>,
	<hector@marcansoft.com>, Jan Kiszka <jan.kiszka@siemens.com>,
	Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
	<pbonzini@redhat.com>, Anthony Liguori <aliguori@us.ibm.com>,
	Jes Sorensen <Jes.Sorensen@redhat.com>,
	Oliver Neukum <oliver@neukum.org>, Greg KH <greg@kroah.com>,
	Felipe Balbi <balbi@ti.com>, Clemens Ladisch <clemens@ladisch.de>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: Re: Improving kernel -> userspace (usbfs)  usb device hand off
Date: Fri, 10 Jun 2011 11:21:59 -0400 (EDT)	[thread overview]
Message-ID: <Pine.LNX.4.44L0.1106101119300.1921-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <4DF23322.1020503@infradead.org>

On Fri, 10 Jun 2011, Mauro Carvalho Chehab wrote:

> Em 10-06-2011 11:48, Alan Stern escreveu:
> > On Fri, 10 Jun 2011, Hans de Goede wrote:
> > 
> > 
> > As Felipe has mentioned, this sounds like the sort of problem that 
> > can better be solved in userspace.  A dual-mode device like the one 
> > you describe really is either a still-cam or a webcam, never both at 
> > the same time.  Hence what users need is a utility program to switch 
> > modes (by loading/unloading the appropriate programs or drivers). 
> 
> Unloading a driver in order to access the hardware via userspace?
> This sounds a very bad idea do me. What happens if another hardware 
> is using the same driver?

A kernel driver wouldn't have to be unloaded.  It could simply be 
unbound from the device via sysfs or usbfs.

Alan STern


  reply	other threads:[~2011-06-10 15:21 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-10  0:21 USB mini-summit at LinuxCon Vancouver Sarah Sharp
2011-06-10  3:18 ` Greg KH
2011-06-10  6:59   ` Gerd Hoffmann
2011-06-10 19:48   ` Sarah Sharp
2011-06-10 20:50     ` Greg KH
2011-06-13 10:44       ` Alexander Graf
2011-06-13 10:44         ` Alexander Graf
2011-06-13 16:29         ` Greg KH
2011-06-13 16:29           ` Greg KH
2011-06-13 17:11           ` Alexander Graf
2011-06-13 17:11             ` Alexander Graf
2011-06-10  7:19 ` Hans de Goede
2011-06-10  7:55 ` Improving kernel -> userspace (usbfs) usb device hand off Hans de Goede
2011-06-10  8:22   ` Felipe Balbi
2011-06-10  8:36     ` Hans de Goede
2011-06-10  8:42       ` Felipe Balbi
2011-06-10 12:19         ` Hans de Goede
2011-06-10 12:28           ` Felipe Balbi
2011-06-10 14:48   ` Alan Stern
2011-06-10 15:07     ` Mauro Carvalho Chehab
2011-06-10 15:21       ` Alan Stern [this message]
2011-06-11  9:15     ` Hans de Goede
2011-06-11 16:19       ` Theodore Kilgore
2011-06-12 11:43         ` Hans de Goede
2011-06-12 21:20           ` Theodore Kilgore
2011-06-13  2:03             ` Xiaofan Chen
2011-06-13  2:27               ` [Libusb-devel] " Michael Bender
2011-06-11 16:57       ` Alan Stern
2011-06-10 18:16   ` Theodore Kilgore
2011-06-10 18:34     ` Felipe Balbi
2011-06-10 21:18       ` Alan Stern
2011-06-10 21:46         ` Felipe Balbi
2011-06-10 22:46         ` Theodore Kilgore
2011-06-10 22:43       ` Theodore Kilgore
2011-06-11  1:30         ` Xiaofan Chen
2011-06-11  4:17           ` Theodore Kilgore
2011-06-13  9:05         ` Felipe Balbi
2011-06-13 13:06           ` Mauro Carvalho Chehab
2011-06-13 13:12             ` Felipe Balbi
2011-08-04 22:21 ` USB mini-summit at LinuxCon Vancouver Mauro Carvalho Chehab
2011-08-04 22:56   ` Greg KH
     [not found]     ` <CAA6KcBBZv7bvVxvEWOYL83igpNZHyzh=bcGxh6Dr5aKsvJK5Cg@mail.gmail.com>
2011-08-05  0:33       ` Mauro Carvalho Chehab
2011-08-05  2:56     ` Theodore Kilgore
2011-08-05  6:57     ` Oliver Neukum
2011-08-05 17:38       ` Theodore Kilgore
2011-08-05  7:45     ` Hans de Goede
2011-08-05  7:59       ` USB mini-summit at LinuxCon Vancouveroliver Oliver Neukum
2011-08-05  8:18         ` Hans de Goede
2011-08-05 13:07       ` USB mini-summit at LinuxCon Vancouver Mauro Carvalho Chehab
2011-08-08 17:58       ` Sarah Sharp
2011-08-08 18:23         ` Theodore Kilgore
2011-08-08 18:32           ` Sarah Sharp
2011-08-08 19:37         ` Mauro Carvalho Chehab
2011-08-09  7:52         ` Hans de Goede
2011-08-09 14:19           ` Alan Stern
2011-08-09 15:03             ` Marko Ristola
2011-08-09 19:57             ` Hans de Goede
2011-08-09 20:31               ` Adam Baker
2011-08-09 20:57                 ` Hans de Goede
2011-08-10  2:05                   ` Xiaofan Chen
2011-08-10 23:04                   ` Adam Baker
2011-08-11  8:14                     ` Hans de Goede
2011-08-09 23:05               ` Theodore Kilgore
2011-08-10 14:19               ` Alan Stern
2011-08-10 15:03                 ` Theodore Kilgore
2011-08-10 16:09                   ` Alan Stern
2011-08-10 18:33                     ` Theodore Kilgore
2011-08-10 19:39                       ` Hans Verkuil
2011-08-10 19:43                       ` Greg KH
2011-08-10 20:34                         ` Theodore Kilgore
2011-08-10 20:14                       ` Mauro Carvalho Chehab
2011-08-10 20:39                         ` Theodore Kilgore
2011-08-11  8:57                         ` Jean-Francois Moine
2011-08-11 11:19                           ` Mauro Carvalho Chehab
2011-08-11  8:14                     ` Hans de Goede
2011-08-11 14:56                       ` Alan Stern
2011-08-11 15:13                         ` Mauro Carvalho Chehab
2011-08-11 15:25                           ` Alan Cox
2011-08-11 15:49                             ` Alan Stern
2011-08-11 20:01                               ` Theodore Kilgore
2011-08-11 20:32                                 ` Mauro Carvalho Chehab
2011-08-11 23:13                                   ` Theodore Kilgore
2011-08-12  7:16                                   ` Hans de Goede
2011-08-12 10:11                                   ` Alan Cox
2011-08-12  1:07                                 ` Alan Stern
2011-08-12  2:38                                   ` Theodore Kilgore
2011-08-11 15:44                           ` Alan Stern
2011-08-12  7:26                         ` Hans de Goede
2011-08-12 15:36                           ` Alan Stern
2011-08-09 17:10           ` Sarah Sharp

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