Date: Mon, 17 Aug 2015 10:00:26 -0400 From: Brian Fundakowski Feldman <brianfundakowskifeldman@gmail.com> To: hackers@freebsd.org Subject: spigen(4) SPI Generic IO interface -- need comments Message-ID: <CAEv1%2BOU4cFpMpeQGfnCP7L4Q_k18rOSOA9JBnKUa99DS5dFnWA@mail.gmail.com>
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--089e013d203c42ea93051d823955 Content-Type: text/plain; charset=UTF-8 I'm woefully out-of-practice with my kernel hackery (but still pretty proficient in jiggery-pokery) so I would like to get comments on a little driver I just made for interfacing arbitrarily in userland with SPI components. The only thing I'm exposing is a /dev/spigenN node with a single transfer ioctl and I put together a test circuit and program with an MCP3008 10-bit ADC IC to validate that it basically works, other than the limitation that the transfers must be octet-multiply-sized, but I haven't looked at the SoC's (I'm using a Raspberry Pi 2) data sheet to tell whether that's just a limit on the spibus(4) interface or the Broadcom SPI driver or the Broadcom SoC itself. I hit one snag in development where I simply called the ioctl wrong and found copyin(9) to page fault HARD if given a bogus user address to copy from, and panic the kernel. I can post up the test program if anyone wants but it's very trivial: I just align the start bit and the command data into the least significant bits of the first octet, shift it up two positions so the NULs get clocked out as part of the command field, and provide two octets for the data field to retrieve back the 10-bit digital value. Good to be back in the FreeBSD hacking! Cheers, Brian Fundakowski Feldman --089e013d203c42ea93051d823955 Content-Type: application/octet-stream; name="spigen.patch" Content-Disposition: attachment; filename="spigen.patch" Content-Transfer-Encoding: base64 X-Attachment-Id: f_idfzo8lg0 SW5kZXg6IHN5cy9jb25mL2ZpbGVzCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIHN5cy9jb25mL2ZpbGVzCShyZXZp c2lvbiAyODY3ODYpCisrKyBzeXMvY29uZi9maWxlcwkod29ya2luZyBjb3B5KQpAQCAtMjQ1MCw2 ICsyNDUwLDcgQEAKIGRldi9zcGlidXMvb2Z3X3NwaWJ1cy5jCQlvcHRpb25hbCBmZHQgc3BpYnVz CiBkZXYvc3BpYnVzL3NwaWJ1cy5jCQlvcHRpb25hbCBzcGlidXMJCQkJXAogCWRlcGVuZGVuY3kJ InNwaWJ1c19pZi5oIgorZGV2L3NwaWJ1cy9zcGlnZW4uYwkJb3B0aW9uYWwgc3BpYnVzCiBkZXYv c3BpYnVzL3NwaWJ1c19pZi5tCQlvcHRpb25hbCBzcGlidXMKIGRldi9zdGUvaWZfc3RlLmMJCW9w dGlvbmFsIHN0ZSBwY2kKIGRldi9zdGcvdG1jMThjMzAuYwkJb3B0aW9uYWwgc3RnCkluZGV4OiBz eXMvZGV2L3NwaWJ1cy9zcGlnZW4uYwo9PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 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