pciconf -w

[M. Warner Losh]

In message: <200804161037.26572.jhb at freebsd.org>
            John Baldwin <jhb at freebsd.org> writes:
: On Wednesday 16 April 2008 07:40:18 am Takashi Inoue wrote:
: > Hi friends,
: >
: > Does anyone know how to trun off a pci device using pciconf -w ?
: >
: > Becase my MiniPCI Express wireless card is realy hot,
: > I want to turn off when I don't need it.
: >
: >
: > ath0 at pci0:3:0:0:       class=0x020000 card=0x058a1014 chip=0x1014168c
: > rev=0x01 hdr=0x00
: >     vendor     = 'Atheros Communications Inc.'
: >     device     = 'AR5212 Atheros AR5212 802.11abg wireless'
: >     class      = network
: >     subclass   = ethernet
: >     cap 01[40] = powerspec 2  supports D0 D3  current D0
: >     cap 05[50] = MSI supports 1 message
: >     cap 10[60] = PCI-Express 1 legacy endpoint
: >     cap 11[90] = MSI-X supports 1 message in map 0x10
: 
: Bug warner (imp at FreeBSD.org) for his devctl patch and use that to turn it off.

You could unload the ath driver :-)

Of course, one could argue that the ath driver should set the device
into D3 state when it has been ifconfig'd down.

Warner