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I2C slave events tracepoints can be enabled by:
echo 1 > /sys/kernel/tracing/events/i2c_slave/enable
and logs in /sys/kernel/tracing/trace will look like:
... i2c_slave: i2c-0 a=010 ret=0 WR_REQ []
... i2c_slave: i2c-0 a=010 ret=0 WR_RCV [02]
... i2c_slave: i2c-0 a=010 ret=0 WR_RCV [0c]
... i2c_slave: i2c-0 a=010 ret=0 STOP []
... i2c_slave: i2c-0 a=010 ret=0 RD_REQ [04]
... i2c_slave: i2c-0 a=010 ret=0 RD_PRO [b4]
... i2c_slave: i2c-0 a=010 ret=0 STOP []
formatted as:
i2c-<adapter_nr>
a=<addr>
ret=<ret> <- callback return value
<event>
[<data>]
trace printings can be selected by adding a filter like:
echo adapter_nr==1 >/sys/kernel/tracing/events/i2c_slave/filter
Signed-off-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
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Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
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Add check for ERR_PTR and simplify code while here.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
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Based on 1 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 3029 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The i2c_lock_adapter name is ambiguous since it is unclear if it
refers to the root adapter or the adapter you name in the argument.
The natural interpretation is the adapter you name in the argument,
but there are historical reasons for that not being the case; it
in fact locks the root adapter. Just remove the function and force
users to spell out the I2C_LOCK_ROOT_ADAPTER name to indicate what
is really going on. Also remove i2c_unlock_adapter, of course.
This patch was generated with
git grep -l 'i2c_\(un\)\?lock_adapter' \
| xargs sed -i 's/i2c_\(un\)\?lock_adapter(\([^)]*\))/'\
'i2c_\1lock_bus(\2, I2C_LOCK_ROOT_ADAPTER)/g'
followed by white-space touch-up.
Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Also removes some ifdeffery.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Jae Hyun Yoo
Wolfram Sang
Thomas Gleixner
Peter Rosin
Wolfram Sang