From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- Documentation/i2c/ten-bit-addresses | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 Documentation/i2c/ten-bit-addresses (limited to 'Documentation/i2c/ten-bit-addresses') diff --git a/Documentation/i2c/ten-bit-addresses b/Documentation/i2c/ten-bit-addresses new file mode 100644 index 00000000000..200074f8136 --- /dev/null +++ b/Documentation/i2c/ten-bit-addresses @@ -0,0 +1,22 @@ +The I2C protocol knows about two kinds of device addresses: normal 7 bit +addresses, and an extended set of 10 bit addresses. The sets of addresses +do not intersect: the 7 bit address 0x10 is not the same as the 10 bit +address 0x10 (though a single device could respond to both of them). You +select a 10 bit address by adding an extra byte after the address +byte: + S Addr7 Rd/Wr .... +becomes + S 11110 Addr10 Rd/Wr +S is the start bit, Rd/Wr the read/write bit, and if you count the number +of bits, you will see the there are 8 after the S bit for 7 bit addresses, +and 16 after the S bit for 10 bit addresses. + +WARNING! The current 10 bit address support is EXPERIMENTAL. There are +several places in the code that will cause SEVERE PROBLEMS with 10 bit +addresses, even though there is some basic handling and hooks. Also, +almost no supported adapter handles the 10 bit addresses correctly. + +As soon as a real 10 bit address device is spotted 'in the wild', we +can and will add proper support. Right now, 10 bit address devices +are defined by the I2C protocol, but we have never seen a single device +which supports them. -- cgit v1.2.3