Re: Bus Driver probe and attach device
takawata_at_jp.freebsd.org
Date: 07/22/05
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To: freebsd-hackers@freebsd.org Date: Fri, 22 Jul 2005 16:48:07 +0900
In message <c5c2798005072123385249195e@mail.gmail.com>, $B<<D.M%9a(B wrote:
>Hi:
>
>I'm trying to written Azalia (HD Audio) driver for freebsd now.
>
>The HDA controller is a standard controller, which can take max=
>15 codecs. I'm planning made it be a bus driver (azalia bus).
>
>I tried to read the PCI, USB and Firewire driver code be sample.
>It looks:
>
>1. Detect codec which already connected to azalia controller.
>2. call device_add_child(azbus_dev, NULL, -1); to create a child
> device, which attach to azalia bus driver.
>3. allocate memory to put codec info (e.g. device id, vendor id,=20
> revision..etc), and call device_set_ivars(codec_dev, codec_info);
> save the codec_info ptr into device's ivars.
>4. Continue 1 ~ 3, untin all available codecs be added.
>
>After all codecs be added, I call the device_probe_and_attach(azbus_dev);,
>but there is no thing happend.=20
Because it trys to attach azbus driver itself, not try to attach its child.
>Then I try to call bus_generic_attach(azbus_dev);, the codecs driver probe
>function be called.
>Is this correct (use bus_generic_attach()), and I'm interested the detail.
Correct. It calls device_probe_and_attach() for all child you already
add.
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- Previous message: Andrea Campi: "Re: IPv4 Link Local support in FreeBSD"
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