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x/exp/io/i2c: Devfs should not use read() and write() calls #15264

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rakyll opened this issue Apr 12, 2016 · 2 comments
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x/exp/io/i2c: Devfs should not use read() and write() calls #15264

rakyll opened this issue Apr 12, 2016 · 2 comments
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@rakyll
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rakyll commented Apr 12, 2016

Only a subset of the I2C and SMBus protocols can be implemented by using read() and write() calls, e.g. full duplex transmission is not supported. Most user-space programs directly depend on the I2C driver functions.

See i2c_smbus_read_word_data and i2c_smbus_write_word_data at the kernel driver reference (https://www.kernel.org/doc/Documentation/i2c/dev-interface).
@rakyll rakyll self-assigned this Apr 12, 2016
@rakyll rakyll added this to the Unreleased milestone Apr 12, 2016
@rakyll rakyll changed the title exp/io/i2c: Devfs should not use read() and write() calls x/exp/io/i2c: Devfs should not use read() and write() calls Apr 12, 2016
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CL https://golang.org/cl/21960 mentions this issue.

gopherbot pushed a commit to golang/exp that referenced this issue Apr 19, 2016
@rakyll
io/i2c: depend on ioctl calls to read/write
d5aecea 
Tested with a Grove-LCD RGB Backlight.

Updates golang/go#15264.

Change-Id: Iba3653de83c2355686674907ee93bed0cb17a663
Reviewed-on: https://go-review.googlesource.com/21960
Reviewed-by: Minux Ma <minux@golang.org>
@ALTree
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ALTree commented Sep 7, 2020

Since x/exp/io is no longer developed and essentially frozen, I'm closing this issue.

@ALTree ALTree closed this as completed Sep 7, 2020
@golang golang locked and limited conversation to collaborators Sep 7, 2021
@rsc rsc unassigned rakyll Jun 23, 2022
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