Date: Sat, 8 Jan 2011 14:49:59 -0500 From: Andrew Gallatin <gallatin@gmail.com> To: freebsd-multimedia@freebsd.org Subject: Re: em28xx? Message-ID: <AANLkTimOtABnMgkNn9jAiThWmZ9Ec3pNQ%2Bq_GR_1Ae4h@mail.gmail.com> In-Reply-To: <AANLkTimhh9qt1mwMk0NJ0_XP2W14azixpKD=fZYYpOpi@mail.gmail.com> References: <AANLkTimhh9qt1mwMk0NJ0_XP2W14azixpKD=fZYYpOpi@mail.gmail.com>
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On Sat, Jan 8, 2011 at 2:11 PM, Andrew Gallatin <gallatin@gmail.com> wrote:
> (see appended output). =A0Has anybody tried =A0this before? =A0What are t=
he
> general steps for porting a driver?
So I hacked on it for a while (see attached dirty patch) and I've got
the em28xx device seen. But it dies in v4l2_device_register():
(gdb) bt
#0 0x000000000040aeba in v4l2_device_register (dev=3D0x8011bf4b0,
v4l2_dev=3D0x801202630)
at /tank/ports/multimedia/webcamd/work.bak/webcamd-0.1.18/v4l-dvb/linux=
/drivers/media/video/v4l2-device.c:47
#1 0x000000000046c933 in em28xx_usb_probe (interface=3D0x8011bf4b0, id=3D0=
x6d43c8)
at /tank/ports/multimedia/webcamd/work.bak/webcamd-0.1.18/v4l-dvb/linux=
/drivers/media/video/em28xx/em28xx-cards.c:2908
#2 0x00000000004084f2 in usb_linux_probe_p (p_bus=3D0x758d50,
p_addr=3D0x758d54, p_index=3D0x758d58) at
/tank/ports/multimedia/webcamd/work.bak/webcamd-0.1.18/kernel/linux_usb.c:4=
15
#3 0x00000000004f04ff in main (argc=3D-5792, argv=3D0x7fffffffea80) at
webcamd.c:482
(gdb) frame 0
#0 0x000000000040aeba in v4l2_device_register (dev=3D0x8011bf4b0,
v4l2_dev=3D0x801202630)
at /tank/ports/multimedia/webcamd/work.bak/webcamd-0.1.18/v4l-dvb/linux=
/drivers/media/video/v4l2-device.c:47
47 snprintf(v4l2_dev->name,
sizeof(v4l2_dev->name), "%s %s",
(gdb) l
42 return 0;
43 }
44
45 /* Set name to driver name + device name if it is empty. */
46 if (!v4l2_dev->name[0])
47 snprintf(v4l2_dev->name,
sizeof(v4l2_dev->name), "%s %s",
48 dev->driver->name, dev_name(dev));
49 if (dev_get_drvdata(dev))
50 v4l2_warn(v4l2_dev, "Non-NULL drvdata on register\n=
");
51 dev_set_drvdata(dev, v4l2_dev);
(gdb) p dev->driver->name
Cannot access memory at address 0x0
(gdb) p dev->driver
$2 =3D (struct device_driver *) 0x0
(gdb) p dev
$3 =3D (struct device *) 0x8011bf4b0
Advice?
Thanks,
Drew
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