linux-kernel - Re: [PATCH v4 1/2] IIO: st_accel_i2c.c: Simplify access to driver data

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Date:   Sat, 7 Jul 2018 17:34:08 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
Cc:     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>, nv@...n.de,
        Javier Martinez Canillas <javier@...hile0.org>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] IIO: st_accel_i2c.c: Simplify access to driver
 data

On Tue, 3 Jul 2018 07:41:00 +0200
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.
> 
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks and was interesting to follow the discussion I missed mid week!

Jonathan

> ---
>  drivers/iio/accel/st_accel_i2c.c | 59 ++++++++++++++------------------
>  1 file changed, 25 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/iio/accel/st_accel_i2c.c b/drivers/iio/accel/st_accel_i2c.c
> index 056dddb27236..d02298f0256c 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"
>  
> @@ -107,8 +107,8 @@ MODULE_DEVICE_TABLE(of, st_accel_of_match);
>  
>  #ifdef CONFIG_ACPI
>  static const struct acpi_device_id st_accel_acpi_match[] = {
> -	{"SMO8840", LNG2DM},
> -	{"SMO8A90", LNG2DM},
> +	{"SMO8840", (kernel_ulong_t)LNG2DM_ACCEL_DEV_NAME},
> +	{"SMO8A90", (kernel_ulong_t)LNG2DM_ACCEL_DEV_NAME},
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(acpi, st_accel_acpi_match);
> @@ -117,24 +117,24 @@ 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);
> @@ -144,6 +144,7 @@ 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));
> @@ -152,19 +153,9 @@ 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);
> +	if (match)
> +		strlcpy(client->name, match, sizeof(client->name));
>  
>  	st_sensors_i2c_configure(indio_dev, client, adata);
>