Some places in the kernel allow users to map resources to a device
using device name (for example, in the struct gpiod_lookup_table).
Currently this involves waiting for the I2C client to have been registered
so we can use dev_name(&client->dev). We want to add a function to allow
users to refer to an I2C device by name before it has been instantiated,
so create a macro for the format that's accessible outside the I2C layer
and use it in i2c_dev_set_name().
Acked-by: Wolfram Sang <wsa@xxxxxxxxxx>
Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Reviewed-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Daniel Scally <djrscally@xxxxxxxxx>
---
Changes since v3:
- None
drivers/i2c/i2c-core-base.c | 4 ++--
include/linux/i2c.h | 3 +++
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 5a97e4a02fa2..2ca50a6f5514 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -852,12 +852,12 @@ static void i2c_dev_set_name(struct i2c_adapter *adap,
struct acpi_device *adev = ACPI_COMPANION(&client->dev);
if (info && info->dev_name) {
- dev_set_name(&client->dev, "i2c-%s", info->dev_name);
+ dev_set_name(&client->dev, I2C_DEV_NAME_FORMAT, info->dev_name);
return;
}
if (adev) {
- dev_set_name(&client->dev, "i2c-%s", acpi_dev_name(adev));
+ dev_set_name(&client->dev, I2C_DEV_NAME_FORMAT, acpi_dev_name(adev));
return;
}
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index e8f2ac8c9c3d..d9f433617a8d 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -39,6 +39,9 @@ enum i2c_slave_event;
typedef int (*i2c_slave_cb_t)(struct i2c_client *client,
enum i2c_slave_event event, u8 *val);
+/* I2C Device Name Format - to maintain consistency outside the i2c layer */
+#define I2C_DEV_NAME_FORMAT "i2c-%s"
+
/* I2C Frequency Modes */
#define I2C_MAX_STANDARD_MODE_FREQ 100000
#define I2C_MAX_FAST_MODE_FREQ 400000
--
2.25.1
