linux-kernel - Re: [RFC PATCH 1/2] i2c: core: Introduce i2c_client_get_device

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Message-ID: <20221101145421.jwytax2srno4hhrl@pengutronix.de>
Date:   Tue, 1 Nov 2022 15:54:21 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Angel Iglesias <ang.iglesiasg@...il.com>
Cc:     linux-iio@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Nuno Sá <noname.nuno@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] i2c: core: Introduce i2c_client_get_device_id
 helper function

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@...il.com>
> Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Suggested-by: Jonathan Cameron <jic23@...nel.org>
> Signed-off-by: Angel Iglesias <ang.iglesiasg@...il.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/ |

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