Date: Wed, 18 Aug 1999 13:55:38 -0600 (MDT) From: "Kenneth D. Merry" <ken@kdm.org> To: hasty@rah.star-gate.com (Amancio Hasty) Cc: dillon@apollo.backplane.com, wilko@yedi.iaf.nl, current@FreeBSD.ORG Subject: Re: [re]writable cdrom drive Message-ID: <199908181955.NAA21794@panzer.kdm.org> In-Reply-To: <199908181949.MAA01438@rah.star-gate.com> from Amancio Hasty at "Aug 18, 1999 12:49:13 pm"
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Amancio Hasty wrote... > > There is a generic SCSI bus enumerator API, and one for PCI as well. There > > isn't a generic API to get trees of devices of any type in the system, > > though. With new-bus that might be possible, but having done two > > enumerator APIs already (I wrote the CAM and PCI enumerator code), I can > > predict that it might be very complicated to do properly. (Things get > > really hairy when you have to keep the device tree from changing while > > you're traversing it.) > > > > In any case, for the two applications you specified, cdrecord is only > > interested in SCSI devices, and there is already an API -- that cdrecord > > already supports -- to do bus/device enumeration. The cdrecord -scanbus > > code already uses that API. > > > > Similarly, there is already a PCI device listing interface, so fxtv should > > be able to easily pull out the devices it is interested in. All it has to > > do is search for all "meteor" or "bktr" devices to find what it wants. > > > > Ken > > Now how can I map a device name from this bus enumeration so that I can issue > an "open" to the device: > > pciconf -l > chip0@pci0:0:0: class=0x060000 card=0x00000000 chip=0x12378086 rev=0x02 > hdr=0x00 > isab0@pci0:1:0: class=0x060100 card=0x00000000 chip=0x70008086 rev=0x01 > hdr=0x00 > ide_pci0@pci0:1:1: class=0x010180 card=0x00000000 chip=0x70108086 > rev=0x00 hdr=0x00 > chip1@pci0:1:2: class=0x0c0300 card=0x00000000 chip=0x70208086 rev=0x01 > hdr=0x00 > de0@pci0:9:0: class=0x020000 card=0x11001385 chip=0x00091011 rev=0x22 > hdr=0x00 > bktr0@pci0:10:0: class=0x040000 card=0x13eb0070 chip=0x036e109e > rev=0x02 hdr=0x00 > none0@pci0:10:1: class=0x048000 card=0x13eb0070 chip=0x0878109e > rev=0x02 hdr=0x00 > ahc0@pci0:11:0: class=0x010000 card=0x00000000 chip=0x81789004 rev=0x00 > hdr=0x00 > ahc1@pci0:12:0: class=0x010000 card=0x00000000 chip=0x71789004 rev=0x03 > hdr=0x00 > vga-pci0@pci0:13:0: class=0x030000 card=0x00000000 chip=0x0519102b > rev=0x01 hdr=0x00 Only one of the above devices actually has a character device interface in /dev. All you have to do is something like this: sprintf(foo, "/dev/%s%d", p->pd_name, p->pd_unit); The only way it would become complicated is if the device name in the kernel were different than the device name in /dev. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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