From: "Frank Schäfer" <fschaefer.oss-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
To: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Q: i2c block write emulation / handling of i2c message size constraints of a bus ?
Date: Sat, 27 Oct 2012 17:17:34 +0300 [thread overview]
Message-ID: <508BECFE.2010302@googlemail.com> (raw)
Hi,
the i2c interface of my device is capable of writing 2 bytes (reg +
data) and reading a single data byte only.
A block read/write emulation function would have to do an i2c write (to
increase the register) followed by either an i2c read or write for each
data byte.
The question is now: does it make sense to emulate block operations for
the i2c/smbus layer in this case ?
I'm not sure if an i2c read through the smbus/i2c subsystem should
really trigger multiple low level i2c reads/writes...
What's the right error code to return from the drivers master_xfer
function if the message length is not supported ? -EMSGSIZE ?
Regards,
Frank
next reply other threads:[~2012-10-27 14:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-27 14:17 Frank Schäfer [this message]
[not found] ` <508BECFE.2010302-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2012-10-27 15:50 ` Q: i2c block write emulation / handling of i2c message size constraints of a bus ? Jean Delvare
[not found] ` <20121027175030.0474249b-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2012-10-27 15:41 ` Frank Schäfer
[not found] ` <508C009F.30107-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2012-10-28 12:03 ` Jean Delvare
[not found] ` <20121028130301.64f032ff-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2012-10-28 13:32 ` Frank Schäfer
[not found] ` <508D33E0.6070808-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2012-10-28 15:33 ` Jean Delvare
[not found] ` <20121028163342.48bc40aa-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2012-10-28 15:25 ` Frank Schäfer
[not found] ` <508D4E5F.4070209-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2012-10-28 17:39 ` Jean Delvare
[not found] ` <20121028183913.79ad5ae3-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2012-10-29 15:24 ` Frank Schäfer
[not found] ` <508E9FA0.4000505-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2012-10-29 17:27 ` Jean Delvare
2012-10-28 15:11 ` Laurent Pinchart
2012-10-28 14:37 ` Frank Schäfer
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