linux-kernel - Re: [PATCH v1 05/17] misc: ds1682: Change nvmem reg

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Date: Wed, 5 Jun 2024 14:18:13 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Joy Chakraborty <joychakr@...gle.com>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Lars-Peter Clausen <lars@...afoo.de>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>,
 Bingbu Cao <bingbu.cao@...el.com>, Zhihao Cheng <chengzhihao1@...wei.com>,
 Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-iio@...r.kernel.org, linux-media@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-gpio@...r.kernel.org,
 linux-mtd@...ts.infradead.org, linux-rtc@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-tegra@...r.kernel.org,
 linux-usb@...r.kernel.org, manugautam@...gle.com
Subject: Re: [PATCH v1 05/17] misc: ds1682: Change nvmem reg_read/write return
 type

On 6/5/24 10:59, Joy Chakraborty wrote:
> Change nvmem read/write function definition return type to ssize_t.
> 
> Signed-off-by: Joy Chakraborty <joychakr@...gle.com>
> ---
>   drivers/misc/ds1682.c | 16 ++++++----------
>   1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/misc/ds1682.c b/drivers/misc/ds1682.c
> index 5f8dcd0e3848..953341666ddb 100644
> --- a/drivers/misc/ds1682.c
> +++ b/drivers/misc/ds1682.c
> @@ -198,26 +198,22 @@ static const struct bin_attribute ds1682_eeprom_attr = {
>   	.write = ds1682_eeprom_write,
>   };
>   
> -static int ds1682_nvmem_read(void *priv, unsigned int offset, void *val,
> -			     size_t bytes)
> +static ssize_t ds1682_nvmem_read(void *priv, unsigned int offset, void *val,
> +				 size_t bytes)
>   {
>   	struct i2c_client *client = priv;
> -	int ret;
>   
> -	ret = i2c_smbus_read_i2c_block_data(client, DS1682_REG_EEPROM + offset,
> +	return i2c_smbus_read_i2c_block_data(client, DS1682_REG_EEPROM + offset,
>   					    bytes, val);
> -	return ret < 0 ? ret : 0;
>   }
>   
> -static int ds1682_nvmem_write(void *priv, unsigned int offset, void *val,
> -			      size_t bytes)
> +static ssize_t ds1682_nvmem_write(void *priv, unsigned int offset, void *val,
> +				  size_t bytes)
>   {
>   	struct i2c_client *client = priv;
> -	int ret;
>   
> -	ret = i2c_smbus_write_i2c_block_data(client, DS1682_REG_EEPROM + offset,
> +	return i2c_smbus_write_i2c_block_data(client, DS1682_REG_EEPROM + offset,
>   					     bytes, val);

i2c_smbus_write_i2c_block_data() does not return the number of bytes written.
It returns either 0 or an error code.

Guenter