Re: [RFC PATCH 1/2] i2c: core: Introduce i2c_client_get_device_id helper function

Uwe Kleine-König
2022-11-01T14:54:49Z

[-- Attachment #1: Type: text/plain, Size: 1984 bytes --]

On Sun, Oct 30, 2022 at 06:52:18PM +0100, Angel Iglesias wrote:
> Introduces new helper function to aid in .probe_new() refactors. In order
> to use existing i2c_get_device_id() on the probe callback, the device
> match table needs to be accessible in that function, which would require
> bigger refactors in some drivers using the deprecated .probe callback.
>
> This issue was discussed in more detail in the IIO mailing list.
>
> Link: https://lore.kernel.org/all/20221023132302.911644-11-u.kleine-koenig@pengutronix.de/
> Suggested-by: Nuno Sá <noname.nuno@gmail.com>
> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Suggested-by: Jonathan Cameron <jic23@kernel.org>
> Signed-off-by: Angel Iglesias <ang.iglesiasg@gmail.com>
> ---
> drivers/i2c/i2c-core-base.c | 15 +++++++++++++++
> include/linux/i2c.h | 1 +
> 2 files changed, 16 insertions(+)
>
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index b4edf10e8fd0..e6623226e393 100644
> --- a/drivers/i2c/i2c-core-base.c
> +++ b/drivers/i2c/i2c-core-base.c
> @@ -2236,6 +2236,21 @@ int i2c_get_device_id(const struct i2c_client *client,
> }
> EXPORT_SYMBOL_GPL(i2c_get_device_id);
>
> +/**
> + * i2c_client_get_device_id - get the driver match table entry of a device
> + * @client: the device to query
> + *
> + * Returns a pointer to the matching entry if found, NULL otherwise.
> + */
> +const struct i2c_device_id *i2c_client_get_device_id(const struct i2c_client *client)
> +{
> + const struct i2c_driver *drv = to_i2c_driver(client->dev.driver);
> +
> + return i2c_match_id(drv->id_table, client);
> +

I'd drop the empty line after the return. Is it worth to note in a
comment that it only works for bound clients? (Oopses otherwise)

Best regards
Uwe

--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]