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i2c: Add i2c_get_match_data()

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[ Upstream commit 564d73c4d9201526bd976b9379d2aaf1a7133e84 ]

Add i2c_get_match_data() to get match data for I2C, ACPI and
DT-based matching, so that we can optimize the driver code.

Suggested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
[wsa: simplified var initialization]
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Stable-dep-of: 119abf7d1815 ("hwmon: (max16065) Fix alarm attributes")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Biju Das 2023-06-07 17:57:38 +01:00 committed by Ksawlii
parent 5020ab1059
commit a52f68ee65
2 changed files with 21 additions and 0 deletions
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19
drivers/i2c/i2c-core-base.c
View file

@ -92,6 +92,25 @@ const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
}
EXPORT_SYMBOL_GPL(i2c_match_id);
const void *i2c_get_match_data(const struct i2c_client *client)
{
struct i2c_driver *driver = to_i2c_driver(client->dev.driver);
const struct i2c_device_id *match;
const void *data;
data = device_get_match_data(&client->dev);
if (!data) {
match = i2c_match_id(driver->id_table, client);
if (!match)
return NULL;
data = (const void *)match->driver_data;
}
return data;
}
EXPORT_SYMBOL(i2c_get_match_data);
static int i2c_device_match(struct device *dev, struct device_driver *drv)
{
struct i2c_client *client = i2c_verify_client(dev);

2
include/linux/i2c.h
View file

@ -342,6 +342,8 @@ struct i2c_adapter *i2c_verify_adapter(struct device *dev);
const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
const struct i2c_client *client);
const void *i2c_get_match_data(const struct i2c_client *client);
static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
{
struct device * const dev = kobj_to_dev(kobj);