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i2c: create debugfs entry per adapter

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Two drivers already implement custom debugfs handling for their
i2c_adapter and more will come. So, let the core create a debugfs
directory per adapter and pass that to drivers for their debugfs files.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Wolfram Sang 2023-11-12 17:54:41 -05:00 committed by Wolfram Sang
parent f79ad78a25
commit 73febd775b
2 changed files with 13 additions and 0 deletions
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11
drivers/i2c/i2c-core-base.c
View File

@ -16,6 +16,7 @@
#include <linux/acpi.h>
#include <linux/clk/clk-conf.h>
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/errno.h>
@ -67,6 +68,8 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver);
static DEFINE_STATIC_KEY_FALSE(i2c_trace_msg_key);
static bool is_registered;
static struct dentry *i2c_debugfs_root;
int i2c_transfer_trace_reg(void)
{
static_branch_inc(&i2c_trace_msg_key);
@ -1524,6 +1527,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
goto out_list;
}
adap->debugfs = debugfs_create_dir(dev_name(&adap->dev), i2c_debugfs_root);
res = i2c_setup_smbus_alert(adap);
if (res)
goto out_reg;
@ -1563,6 +1568,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
return 0;
out_reg:
debugfs_remove_recursive(adap->debugfs);
init_completion(&adap->dev_released);
device_unregister(&adap->dev);
wait_for_completion(&adap->dev_released);
@ -1764,6 +1770,8 @@ void i2c_del_adapter(struct i2c_adapter *adap)
i2c_host_notify_irq_teardown(adap);
debugfs_remove_recursive(adap->debugfs);
/* wait until all references to the device are gone
*
* FIXME: This is old code and should ideally be replaced by an
@ -2061,6 +2069,8 @@ static int __init i2c_init(void)
is_registered = true;
i2c_debugfs_root = debugfs_create_dir("i2c", NULL);
#ifdef CONFIG_I2C_COMPAT
i2c_adapter_compat_class = class_compat_register("i2c-adapter");
if (!i2c_adapter_compat_class) {
@ -2099,6 +2109,7 @@ static void __exit i2c_exit(void)
#ifdef CONFIG_I2C_COMPAT
class_compat_unregister(i2c_adapter_compat_class);
#endif
debugfs_remove_recursive(i2c_debugfs_root);
bus_unregister(&i2c_bus_type);
tracepoint_synchronize_unregister();
}

2
include/linux/i2c.h
View File

@ -746,6 +746,8 @@ struct i2c_adapter {
struct irq_domain *host_notify_domain;
struct regulator *bus_regulator;
struct dentry *debugfs;
};
#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)