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| author | Jae Hyun Yoo <quic_jaehyoo@quicinc.com> | 2022-03-18 23:41:33 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2022-03-20 02:11:05 +0300 |
| commit | d714fb25e755ad96b699993fac47f48c4d6cebe9 (patch) | |
| tree | 22bfadf68977db34ed737f3809b5a249ae448f1d /drivers/i2c | |
| parent | 3364c0ef8732694084f8238ffd9c62819209fd7f (diff) | |
| download | linux-d714fb25e755ad96b699993fac47f48c4d6cebe9.tar.xz | |
i2c: add tracepoints for I2C slave events
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core-slave.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-core-slave.c b/drivers/i2c/i2c-core-slave.c index 1589179d5eb9..e3765e12f93b 100644 --- a/drivers/i2c/i2c-core-slave.c +++ b/drivers/i2c/i2c-core-slave.c @@ -14,6 +14,9 @@ #include "i2c-core.h" +#define CREATE_TRACE_POINTS +#include <trace/events/i2c_slave.h> + int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb) { int ret; @@ -79,6 +82,18 @@ int i2c_slave_unregister(struct i2c_client *client) } EXPORT_SYMBOL_GPL(i2c_slave_unregister); +int i2c_slave_event(struct i2c_client *client, + enum i2c_slave_event event, u8 *val) +{ + int ret = client->slave_cb(client, event, val); + + if (trace_i2c_slave_enabled()) + trace_i2c_slave(client, event, val, ret); + + return ret; +} +EXPORT_SYMBOL_GPL(i2c_slave_event); + /** * i2c_detect_slave_mode - detect operation mode * @dev: The device owning the bus |