linux-kernel - Re: [PATCH v3 1/2] IIO: st_accel_i2c.c: Simplify access to driver data

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Message-ID: <CAHp75VfJOhX3+eL-ppvT7SPfDE_S7ht1drjobvFqmXPYApMETg@mail.gmail.com>
Date:   Wed, 4 Jul 2018 19:10:35 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiongfeng Wang <xiongfeng.wang@...aro.org>,
        Javier Martinez Canillas <javier@...hile0.org>,
        linux-iio@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] IIO: st_accel_i2c.c: Simplify access to driver data

On Tue, Jul 3, 2018 at 8:41 AM, Nikolaus Voss
<nikolaus.voss@...wensteinmedical.de> wrote:
> Use device_get_match_data API to simplify access to driver data.
> Let acpi_device_id table entries point to the same driver data as
> of_device_id table entries and uniquify access to driver data by using
> device_get_match_data API. Remove unused i2c_device_id .driver_data
> fields.
>

Couple of comments below, otherwise

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
> ---
>  drivers/iio/accel/st_accel_i2c.c | 56 ++++++++++++++------------------
>  1 file changed, 24 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/iio/accel/st_accel_i2c.c b/drivers/iio/accel/st_accel_i2c.c
> index 6bdec8c451e0..c6e08c834f11 100644
> --- a/drivers/iio/accel/st_accel_i2c.c
> +++ b/drivers/iio/accel/st_accel_i2c.c
> @@ -14,8 +14,8 @@
>  #include <linux/acpi.h>
>  #include <linux/i2c.h>
>  #include <linux/iio/iio.h>
> +#include <linux/property.h>
>
> -#include <linux/iio/common/st_sensors.h>
>  #include <linux/iio/common/st_sensors_i2c.h>
>  #include "st_accel.h"
>
> @@ -107,7 +107,7 @@ MODULE_DEVICE_TABLE(of, st_accel_of_match);
>
>  #ifdef CONFIG_ACPI
>  static const struct acpi_device_id st_accel_acpi_match[] = {
> -       {"SMO8A90", LNG2DM},
> +       {"SMO8A90", (kernel_ulong_t)LNG2DM_ACCEL_DEV_NAME},
>         { },

Is it done against iio-next?

I see two records in this table.

(It might make sense to remove comma from terminator, though it's
minor change, up to you)

>  };
>  MODULE_DEVICE_TABLE(acpi, st_accel_acpi_match);
> @@ -116,24 +116,24 @@ MODULE_DEVICE_TABLE(acpi, st_accel_acpi_match);
>  #endif
>
>  static const struct i2c_device_id st_accel_id_table[] = {
> -       { LSM303DLH_ACCEL_DEV_NAME, LSM303DLH },
> -       { LSM303DLHC_ACCEL_DEV_NAME, LSM303DLHC },
> -       { LIS3DH_ACCEL_DEV_NAME, LIS3DH },
> -       { LSM330D_ACCEL_DEV_NAME, LSM330D },
> -       { LSM330DL_ACCEL_DEV_NAME, LSM330DL },
> -       { LSM330DLC_ACCEL_DEV_NAME, LSM330DLC },
> -       { LIS331DLH_ACCEL_DEV_NAME, LIS331DLH },
> -       { LSM303DL_ACCEL_DEV_NAME, LSM303DL },
> -       { LSM303DLM_ACCEL_DEV_NAME, LSM303DLM },
> -       { LSM330_ACCEL_DEV_NAME, LSM330 },
> -       { LSM303AGR_ACCEL_DEV_NAME, LSM303AGR },
> -       { LIS2DH12_ACCEL_DEV_NAME, LIS2DH12 },
> -       { LIS3L02DQ_ACCEL_DEV_NAME, LIS3L02DQ },
> -       { LNG2DM_ACCEL_DEV_NAME, LNG2DM },
> -       { H3LIS331DL_ACCEL_DEV_NAME, H3LIS331DL },
> -       { LIS331DL_ACCEL_DEV_NAME, LIS331DL },
> -       { LIS3LV02DL_ACCEL_DEV_NAME, LIS3LV02DL },
> -       { LIS2DW12_ACCEL_DEV_NAME, LIS2DW12 },
> +       { LSM303DLH_ACCEL_DEV_NAME },
> +       { LSM303DLHC_ACCEL_DEV_NAME },
> +       { LIS3DH_ACCEL_DEV_NAME },
> +       { LSM330D_ACCEL_DEV_NAME },
> +       { LSM330DL_ACCEL_DEV_NAME },
> +       { LSM330DLC_ACCEL_DEV_NAME },
> +       { LIS331DLH_ACCEL_DEV_NAME },
> +       { LSM303DL_ACCEL_DEV_NAME },
> +       { LSM303DLM_ACCEL_DEV_NAME },
> +       { LSM330_ACCEL_DEV_NAME },
> +       { LSM303AGR_ACCEL_DEV_NAME },
> +       { LIS2DH12_ACCEL_DEV_NAME },
> +       { LIS3L02DQ_ACCEL_DEV_NAME },
> +       { LNG2DM_ACCEL_DEV_NAME },
> +       { H3LIS331DL_ACCEL_DEV_NAME },
> +       { LIS331DL_ACCEL_DEV_NAME },
> +       { LIS3LV02DL_ACCEL_DEV_NAME },
> +       { LIS2DW12_ACCEL_DEV_NAME },
>         {},
>  };
>  MODULE_DEVICE_TABLE(i2c, st_accel_id_table);
> @@ -143,6 +143,7 @@ static int st_accel_i2c_probe(struct i2c_client *client,
>  {
>         struct iio_dev *indio_dev;
>         struct st_sensor_data *adata;
> +       const char *match;
>         int ret;
>
>         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*adata));
> @@ -151,19 +152,10 @@ static int st_accel_i2c_probe(struct i2c_client *client,
>
>         adata = iio_priv(indio_dev);
>
> -       if (client->dev.of_node) {
> -               st_sensors_of_name_probe(&client->dev, st_accel_of_match,
> -                                        client->name, sizeof(client->name));
> -       } else if (ACPI_HANDLE(&client->dev)) {
> -               ret = st_sensors_match_acpi_device(&client->dev);
> -               if ((ret < 0) || (ret >= ST_ACCEL_MAX))
> -                       return -ENODEV;
> -
> -               strlcpy(client->name, st_accel_id_table[ret].name,
> -                               sizeof(client->name));
> -       } else if (!id)
> -               return -ENODEV;

> +       match = device_get_match_data(&client->dev);

>

Redundant blank line

> +       if (match)
> +               strlcpy(client->name, match, sizeof(client->name));
>
>         st_sensors_i2c_configure(indio_dev, client, adata);
>
> --
> 2.17.1
>



-- 
With Best Regards,
Andy Shevchenko